libscf/common/lowlevel.c

	lowlevel.c revision f2fa366a878dc4913b5f87b617e6cb4198b91052
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * This is the main implementation file for the low-level repository
 * interface.
 */

#include "lowlevel_impl.h"

#include "repcache_protocol.h"
#include "scf_type.h"

#include <assert.h>
#include <alloca.h>
#include <door.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <libuutil.h>
#include <poll.h>
#include <pthread.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/sysmacros.h>
#include <unistd.h>

#define ENV_SCF_DEBUG       "LIBSCF_DEBUG"
#define ENV_SCF_DOORPATH    "LIBSCF_DOORPATH"

static uint32_t default_debug = 0;
static const char *default_door_path = REPOSITORY_DOOR_NAME;

#define CALL_FAILED     -1
#define RESULT_TOO_BIG      -2
#define NOT_BOUND       -3

static pthread_mutex_t  lowlevel_init_lock;
static int32_t      lowlevel_inited;

static uu_list_pool_t   *tran_entry_pool;
static uu_list_pool_t   *datael_pool;
static uu_list_pool_t   *iter_pool;

/*
 * We want MUTEX_HELD, but we also want pthreads.
 */
struct _lwp_mutex;
extern int _mutex_held(struct _lwp_mutex *);
#define MUTEX_HELD(m)       _mutex_held((struct _lwp_mutex *)(m))

/*
 * no cancellation, please
 */
struct _lwp_cond;
extern int _cond_wait(struct _lwp_cond *, struct _lwp_mutex *);
#define PTHREAD_COND_WAIT(cv, mx) \
        _cond_wait((struct _lwp_cond *)(cv), (struct _lwp_mutex *)(mx))

#ifdef lint
#define assert_nolint(x) (void)0
#else
#define assert_nolint(x) assert(x)
#endif

static void scf_iter_reset_locked(scf_iter_t *iter);
static void scf_value_reset_locked(scf_value_t *val, int and_destroy);

#define TYPE_VALUE  (-100)

/*
 * Hold and release subhandles.  We only allow one thread access to the
 * subhandles at a time, and he can use any subset, grabbing and releasing
 * them in any order.  The only restrictions are that you cannot hold an
 * already-held subhandle, and all subhandles must be released before
 * returning to the original caller.
 */
static void
handle_hold_subhandles(scf_handle_t *h, int mask)
{
    assert(mask != 0 && (mask & ~RH_HOLD_ALL) == 0);

    (void) pthread_mutex_lock(&h->rh_lock);
    while (h->rh_hold_flags != 0 && h->rh_holder != pthread_self())
        (void) PTHREAD_COND_WAIT(&h->rh_cv, &h->rh_lock);
    if (h->rh_hold_flags == 0)
        h->rh_holder = pthread_self();
    assert(!(h->rh_hold_flags & mask));
    h->rh_hold_flags |= mask;
    (void) pthread_mutex_unlock(&h->rh_lock);
}

static void
handle_rele_subhandles(scf_handle_t *h, int mask)
{
    assert(mask != 0 && (mask & ~RH_HOLD_ALL) == 0);

    (void) pthread_mutex_lock(&h->rh_lock);
    assert(h->rh_holder == pthread_self());
    assert((h->rh_hold_flags & mask));

    h->rh_hold_flags &= ~mask;
    if (h->rh_hold_flags == 0)
        (void) pthread_cond_signal(&h->rh_cv);
    (void) pthread_mutex_unlock(&h->rh_lock);
}

#define HOLD_HANDLE(h, flag, field) \
    (handle_hold_subhandles((h), (flag)), (h)->field)

#define RELE_HANDLE(h, flag) \
    (handle_rele_subhandles((h), (flag)))

/*
 * convenience macros, for functions that only need a one or two handles at
 * any given time
 */
#define HANDLE_HOLD_ITER(h) HOLD_HANDLE((h), RH_HOLD_ITER, rh_iter)
#define HANDLE_HOLD_SCOPE(h)    HOLD_HANDLE((h), RH_HOLD_SCOPE, rh_scope)
#define HANDLE_HOLD_SERVICE(h)  HOLD_HANDLE((h), RH_HOLD_SERVICE, rh_service)
#define HANDLE_HOLD_INSTANCE(h) HOLD_HANDLE((h), RH_HOLD_INSTANCE, rh_instance)
#define HANDLE_HOLD_SNAPSHOT(h) HOLD_HANDLE((h), RH_HOLD_SNAPSHOT, rh_snapshot)
#define HANDLE_HOLD_SNAPLVL(h)  HOLD_HANDLE((h), RH_HOLD_SNAPLVL, rh_snaplvl)
#define HANDLE_HOLD_PG(h)   HOLD_HANDLE((h), RH_HOLD_PG, rh_pg)
#define HANDLE_HOLD_PROPERTY(h) HOLD_HANDLE((h), RH_HOLD_PROPERTY, rh_property)
#define HANDLE_HOLD_VALUE(h)    HOLD_HANDLE((h), RH_HOLD_VALUE, rh_value)

#define HANDLE_RELE_ITER(h) RELE_HANDLE((h), RH_HOLD_ITER)
#define HANDLE_RELE_SCOPE(h)    RELE_HANDLE((h), RH_HOLD_SCOPE)
#define HANDLE_RELE_SERVICE(h)  RELE_HANDLE((h), RH_HOLD_SERVICE)
#define HANDLE_RELE_INSTANCE(h) RELE_HANDLE((h), RH_HOLD_INSTANCE)
#define HANDLE_RELE_SNAPSHOT(h) RELE_HANDLE((h), RH_HOLD_SNAPSHOT)
#define HANDLE_RELE_SNAPLVL(h)  RELE_HANDLE((h), RH_HOLD_SNAPLVL)
#define HANDLE_RELE_PG(h)   RELE_HANDLE((h), RH_HOLD_PG)
#define HANDLE_RELE_PROPERTY(h) RELE_HANDLE((h), RH_HOLD_PROPERTY)
#define HANDLE_RELE_VALUE(h)    RELE_HANDLE((h), RH_HOLD_VALUE)

/*ARGSUSED*/
static int
transaction_entry_compare(const void *l_arg, const void *r_arg, void *private)
{
    const char *l_prop =
        ((scf_transaction_entry_t *)l_arg)->entry_property;
    const char *r_prop =
        ((scf_transaction_entry_t *)r_arg)->entry_property;

    int ret;

    ret = strcmp(l_prop, r_prop);
    if (ret > 0)
        return (1);
    if (ret < 0)
        return (-1);
    return (0);
}

static int
datael_compare(const void *l_arg, const void *r_arg, void *private)
{
    uint32_t l_id = ((scf_datael_t *)l_arg)->rd_entity;
    uint32_t r_id = (r_arg != NULL) ? ((scf_datael_t *)r_arg)->rd_entity :
        *(uint32_t *)private;

    if (l_id > r_id)
        return (1);
    if (l_id < r_id)
        return (-1);
    return (0);
}

static int
iter_compare(const void *l_arg, const void *r_arg, void *private)
{
    uint32_t l_id = ((scf_iter_t *)l_arg)->iter_id;
    uint32_t r_id = (r_arg != NULL) ? ((scf_iter_t *)r_arg)->iter_id :
        *(uint32_t *)private;

    if (l_id > r_id)
        return (1);
    if (l_id < r_id)
        return (-1);
    return (0);
}

static int
lowlevel_init(void)
{
    const char *debug;
    const char *door_path;

    (void) pthread_mutex_lock(&lowlevel_init_lock);
    if (lowlevel_inited == 0) {
        if (!issetugid() &&
            (debug = getenv(ENV_SCF_DEBUG)) != NULL && debug[0] != 0 &&
            uu_strtoint(debug, &default_debug, sizeof (default_debug),
            0, 0, 0) == -1) {
            (void) fprintf(stderr, "LIBSCF: $%s (%s): %s",
                ENV_SCF_DEBUG, debug,
                uu_strerror(uu_error()));
        }

        if (!issetugid() &&
            (door_path = getenv(ENV_SCF_DOORPATH)) != NULL &&
            door_path[0] != 0) {
            default_door_path = strdup(door_path);
            if (default_door_path == NULL)
                default_door_path = door_path;
        }

        datael_pool = uu_list_pool_create("SUNW,libscf_datael",
            sizeof (scf_datael_t), offsetof(scf_datael_t, rd_node),
            datael_compare, UU_LIST_POOL_DEBUG);

        iter_pool = uu_list_pool_create("SUNW,libscf_iter",
            sizeof (scf_iter_t), offsetof(scf_iter_t, iter_node),
            iter_compare, UU_LIST_POOL_DEBUG);

        assert_nolint(offsetof(scf_transaction_entry_t,
            entry_property) == 0);
        tran_entry_pool = uu_list_pool_create(
            "SUNW,libscf_transaction_entity",
            sizeof (scf_transaction_entry_t),
            offsetof(scf_transaction_entry_t, entry_link),
            transaction_entry_compare, UU_LIST_POOL_DEBUG);

        if (datael_pool == NULL || iter_pool == NULL ||
            tran_entry_pool == NULL) {
            lowlevel_inited = -1;
            goto end;
        }

        if (!scf_setup_error()) {
            lowlevel_inited = -1;
            goto end;
        }
        lowlevel_inited = 1;
    }
end:
    (void) pthread_mutex_unlock(&lowlevel_init_lock);
    if (lowlevel_inited > 0)
        return (1);
    return (0);
}

static const struct {
    scf_type_t ti_type;
    rep_protocol_value_type_t ti_proto_type;
    const char *ti_name;
} scf_type_info[] = {
    {SCF_TYPE_BOOLEAN,  REP_PROTOCOL_TYPE_BOOLEAN,  "boolean"},
    {SCF_TYPE_COUNT,    REP_PROTOCOL_TYPE_COUNT,    "count"},
    {SCF_TYPE_INTEGER,  REP_PROTOCOL_TYPE_INTEGER,  "integer"},
    {SCF_TYPE_TIME,     REP_PROTOCOL_TYPE_TIME,     "time"},
    {SCF_TYPE_ASTRING,  REP_PROTOCOL_TYPE_STRING,   "astring"},
    {SCF_TYPE_OPAQUE,   REP_PROTOCOL_TYPE_OPAQUE,   "opaque"},
    {SCF_TYPE_USTRING,  REP_PROTOCOL_SUBTYPE_USTRING,   "ustring"},
    {SCF_TYPE_URI,      REP_PROTOCOL_SUBTYPE_URI,   "uri"},
    {SCF_TYPE_FMRI,     REP_PROTOCOL_SUBTYPE_FMRI,  "fmri"},
    {SCF_TYPE_HOST,     REP_PROTOCOL_SUBTYPE_HOST,  "host"},
    {SCF_TYPE_HOSTNAME, REP_PROTOCOL_SUBTYPE_HOSTNAME,  "hostname"},
    {SCF_TYPE_NET_ADDR_V4,  REP_PROTOCOL_SUBTYPE_NETADDR_V4,
        "net_address_v4"},
    {SCF_TYPE_NET_ADDR_V6,  REP_PROTOCOL_SUBTYPE_NETADDR_V6,
        "net_address_v6"}
};

#define SCF_TYPE_INFO_COUNT (sizeof (scf_type_info) / sizeof (*scf_type_info))
static rep_protocol_value_type_t
scf_type_to_protocol_type(scf_type_t t)
{
    int i;

    for (i = 0; i < SCF_TYPE_INFO_COUNT; i++)
        if (scf_type_info[i].ti_type == t)
            return (scf_type_info[i].ti_proto_type);

    return (REP_PROTOCOL_TYPE_INVALID);
}

static scf_type_t
scf_protocol_type_to_type(rep_protocol_value_type_t t)
{
    int i;

    for (i = 0; i < SCF_TYPE_INFO_COUNT; i++)
        if (scf_type_info[i].ti_proto_type == t)
            return (scf_type_info[i].ti_type);

    return (SCF_TYPE_INVALID);
}

const char *
scf_type_to_string(scf_type_t ty)
{
    int i;

    for (i = 0; i < SCF_TYPE_INFO_COUNT; i++)
        if (scf_type_info[i].ti_type == ty)
            return (scf_type_info[i].ti_name);

    return ("unknown");
}

scf_type_t
scf_string_to_type(const char *name)
{
    int i;

    for (i = 0; i < sizeof (scf_type_info) / sizeof (*scf_type_info); i++)
        if (strcmp(scf_type_info[i].ti_name, name) == 0)
            return (scf_type_info[i].ti_type);

    return (SCF_TYPE_INVALID);
}

int
scf_type_base_type(scf_type_t type, scf_type_t *out)
{
    rep_protocol_value_type_t t = scf_type_to_protocol_type(type);
    if (t == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    *out = scf_protocol_type_to_type(scf_proto_underlying_type(t));
    return (SCF_SUCCESS);
}

/*
 * Convert a protocol error code into an SCF_ERROR_* code.
 */
static scf_error_t
proto_error(rep_protocol_responseid_t e)
{
    switch (e) {
    case REP_PROTOCOL_FAIL_MISORDERED:
    case REP_PROTOCOL_FAIL_UNKNOWN_ID:
    case REP_PROTOCOL_FAIL_INVALID_TYPE:
    case REP_PROTOCOL_FAIL_TRUNCATED:
    case REP_PROTOCOL_FAIL_TYPE_MISMATCH:
    case REP_PROTOCOL_FAIL_NOT_APPLICABLE:
    case REP_PROTOCOL_FAIL_UNKNOWN:
        return (SCF_ERROR_INTERNAL);

    case REP_PROTOCOL_FAIL_BAD_TX:
        return (SCF_ERROR_INVALID_ARGUMENT);
    case REP_PROTOCOL_FAIL_BAD_REQUEST:
        return (SCF_ERROR_INVALID_ARGUMENT);
    case REP_PROTOCOL_FAIL_NO_RESOURCES:
        return (SCF_ERROR_NO_RESOURCES);
    case REP_PROTOCOL_FAIL_NOT_FOUND:
        return (SCF_ERROR_NOT_FOUND);
    case REP_PROTOCOL_FAIL_DELETED:
        return (SCF_ERROR_DELETED);
    case REP_PROTOCOL_FAIL_NOT_SET:
        return (SCF_ERROR_NOT_SET);
    case REP_PROTOCOL_FAIL_EXISTS:
        return (SCF_ERROR_EXISTS);
    case REP_PROTOCOL_FAIL_DUPLICATE_ID:
        return (SCF_ERROR_EXISTS);
    case REP_PROTOCOL_FAIL_PERMISSION_DENIED:
        return (SCF_ERROR_PERMISSION_DENIED);
    case REP_PROTOCOL_FAIL_BACKEND_ACCESS:
        return (SCF_ERROR_BACKEND_ACCESS);
    case REP_PROTOCOL_FAIL_BACKEND_READONLY:
        return (SCF_ERROR_BACKEND_READONLY);

    case REP_PROTOCOL_SUCCESS:
    case REP_PROTOCOL_DONE:
    case REP_PROTOCOL_FAIL_NOT_LATEST:  /* TX code should handle this */
    default:
#ifndef NDEBUG
        uu_warn("%s:%d: Bad error code %d passed to proto_error().\n",
            __FILE__, __LINE__, e);
#endif
        abort();
        /*NOTREACHED*/
    }
}

ssize_t
scf_limit(uint32_t limit)
{
    switch (limit) {
    case SCF_LIMIT_MAX_NAME_LENGTH:
    case SCF_LIMIT_MAX_PG_TYPE_LENGTH:
        return (REP_PROTOCOL_NAME_LEN - 1);
    case SCF_LIMIT_MAX_VALUE_LENGTH:
        return (REP_PROTOCOL_VALUE_LEN - 1);
    case SCF_LIMIT_MAX_FMRI_LENGTH:
        return (SCF_FMRI_PREFIX_MAX_LEN +
            sizeof (SCF_FMRI_SCOPE_PREFIX) - 1 +
            sizeof (SCF_FMRI_SCOPE_SUFFIX) - 1 +
            sizeof (SCF_FMRI_SERVICE_PREFIX) - 1 +
            sizeof (SCF_FMRI_INSTANCE_PREFIX) - 1 +
            sizeof (SCF_FMRI_PROPERTYGRP_PREFIX) - 1 +
            sizeof (SCF_FMRI_PROPERTY_PREFIX) - 1 +
            5 * (REP_PROTOCOL_NAME_LEN - 1));
    default:
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
}

static size_t
scf_opaque_decode(char *out_arg, const char *in, size_t max_out)
{
    char a, b;
    char *out = out_arg;

    while (max_out > 0 && (a = in[0]) != 0 && (b = in[1]) != 0) {
        in += 2;

        if (a >= '0' && a <= '9')
            a -= '0';
        else if (a >= 'a' && a <= 'f')
            a = a - 'a' + 10;
        else if (a >= 'A' && a <= 'F')
            a = a - 'A' + 10;
        else
            break;

        if (b >= '0' && b <= '9')
            b -= '0';
        else if (b >= 'a' && b <= 'f')
            b = b - 'a' + 10;
        else if (b >= 'A' && b <= 'F')
            b = b - 'A' + 10;
        else
            break;

        *out++ = (a << 4) | b;
        max_out--;
    }

    return (out - out_arg);
}

static size_t
scf_opaque_encode(char *out_arg, const char *in_arg, size_t in_sz)
{
    uint8_t *in = (uint8_t *)in_arg;
    uint8_t *end = in + in_sz;
    char *out = out_arg;

    if (out == NULL)
        return (2 * in_sz);

    while (in < end) {
        uint8_t c = *in++;

        uint8_t a = (c & 0xf0) >> 4;
        uint8_t b = (c & 0x0f);

        if (a <= 9)
            *out++ = a + '0';
        else
            *out++ = a + 'a' - 10;

        if (b <= 9)
            *out++ = b + '0';
        else
            *out++ = b + 'a' - 10;
    }

    *out = 0;

    return (out - out_arg);
}

static void
handle_do_close(scf_handle_t *h)
{
    assert(MUTEX_HELD(&h->rh_lock));
    assert(h->rh_doorfd != -1);

    /*
     * if there are any active FD users, we just move the FD over
     * to rh_doorfd_old -- they'll close it when they finish.
     */
    if (h->rh_fd_users > 0) {
        h->rh_doorfd_old = h->rh_doorfd;
        h->rh_doorfd = -1;
    } else {
        assert(h->rh_doorfd_old == -1);
        (void) close(h->rh_doorfd);
        h->rh_doorfd = -1;
    }
}

/*
 * Check if a handle is currently bound.  fork()ing implicitly unbinds
 * the handle in the child.
 */
static int
handle_is_bound(scf_handle_t *h)
{
    assert(MUTEX_HELD(&h->rh_lock));

    if (h->rh_doorfd == -1)
        return (0);

    if (getpid() == h->rh_doorpid)
        return (1);

    /* forked since our last bind -- initiate handle close */
    handle_do_close(h);
    return (0);
}

static int
handle_has_server_locked(scf_handle_t *h)
{
    door_info_t i;
    assert(MUTEX_HELD(&h->rh_lock));

    return (handle_is_bound(h) && door_info(h->rh_doorfd, &i) != -1 &&
        i.di_target != -1);
}

static int
handle_has_server(scf_handle_t *h)
{
    int ret;

    (void) pthread_mutex_lock(&h->rh_lock);
    ret = handle_has_server_locked(h);
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (ret);
}

/*
 * This makes a door request on the client door associated with handle h.
 * It will automatically retry calls which fail on EINTR.  If h is not bound,
 * returns NOT_BOUND.  If the door call fails or the server response is too
 * small, returns CALL_FAILED.  If the server response is too big, truncates the
 * response and returns RESULT_TOO_BIG.  Otherwise, the size of the result is
 * returned.
 */
static ssize_t
make_door_call(scf_handle_t *h, const void *req, size_t req_sz,
    void *res, size_t res_sz)
{
    door_arg_t arg;
    int r;

    assert(MUTEX_HELD(&h->rh_lock));

    if (!handle_is_bound(h)) {
        return (NOT_BOUND);
    }

    arg.data_ptr = (void *)req;
    arg.data_size = req_sz;
    arg.desc_ptr = NULL;
    arg.desc_num = 0;
    arg.rbuf = res;
    arg.rsize = res_sz;

    while ((r = door_call(h->rh_doorfd, &arg)) < 0) {
        if (errno != EINTR)
            break;
    }

    if (r < 0) {
        return (CALL_FAILED);
    }

    if (arg.desc_num > 0) {
        while (arg.desc_num > 0) {
            if (arg.desc_ptr->d_attributes & DOOR_DESCRIPTOR) {
                int cfd = arg.desc_ptr->d_data.d_desc.d_id;
                (void) close(cfd);
            }
            arg.desc_ptr++;
            arg.desc_num--;
        }
    }
    if (arg.data_ptr != res && arg.data_size > 0)
        (void) memmove(res, arg.data_ptr, MIN(arg.data_size, res_sz));

    if (arg.rbuf != res)
        (void) munmap(arg.rbuf, arg.rsize);

    if (arg.data_size > res_sz)
        return (RESULT_TOO_BIG);

    if (arg.data_size < sizeof (uint32_t))
        return (CALL_FAILED);

    return (arg.data_size);
}

/*
 * Should only be used when r < 0.
 */
#define DOOR_ERRORS_BLOCK(r)    {                   \
    switch (r) {                            \
    case NOT_BOUND:                         \
        return (scf_set_error(SCF_ERROR_NOT_BOUND));        \
                                    \
    case CALL_FAILED:                       \
        return (scf_set_error(SCF_ERROR_CONNECTION_BROKEN));    \
                                    \
    case RESULT_TOO_BIG:                        \
        return (scf_set_error(SCF_ERROR_INTERNAL));     \
                                    \
    default:                            \
        assert(r == NOT_BOUND || r == CALL_FAILED ||        \
            r == RESULT_TOO_BIG);               \
        abort();                        \
    }                               \
}

/*
 * Like make_door_call(), but takes an fd instead of a handle, and expects
 * a single file descriptor, returned via res_fd.
 *
 * If no file descriptor is returned, *res_fd == -1.
 */
static int
make_door_call_retfd(int fd, const void *req, size_t req_sz, void *res,
    size_t res_sz, int *res_fd)
{
    door_arg_t arg;
    int r;
    char rbuf[256];

    *res_fd = -1;

    if (fd == -1)
        return (NOT_BOUND);

    arg.data_ptr = (void *)req;
    arg.data_size = req_sz;
    arg.desc_ptr = NULL;
    arg.desc_num = 0;
    arg.rbuf = rbuf;
    arg.rsize = sizeof (rbuf);

    while ((r = door_call(fd, &arg)) < 0) {
        if (errno != EINTR)
            break;
    }

    if (r < 0)
        return (CALL_FAILED);

    if (arg.desc_num > 1) {
        while (arg.desc_num > 0) {
            if (arg.desc_ptr->d_attributes & DOOR_DESCRIPTOR) {
                int cfd =
                    arg.desc_ptr->d_data.d_desc.d_descriptor;
                (void) close(cfd);
            }
            arg.desc_ptr++;
            arg.desc_num--;
        }
    }
    if (arg.desc_num == 1 && arg.desc_ptr->d_attributes & DOOR_DESCRIPTOR)
        *res_fd = arg.desc_ptr->d_data.d_desc.d_descriptor;

    if (arg.data_size > 0)
        (void) memmove(res, arg.data_ptr, MIN(arg.data_size, res_sz));

    if (arg.rbuf != rbuf)
        (void) munmap(arg.rbuf, arg.rsize);

    if (arg.data_size > res_sz)
        return (RESULT_TOO_BIG);

    if (arg.data_size < sizeof (uint32_t))
        return (CALL_FAILED);

    return (arg.data_size);
}

/*
 * Fails with
 *   _VERSION_MISMATCH
 *   _NO_MEMORY
 */
scf_handle_t *
scf_handle_create(scf_version_t v)
{
    scf_handle_t *ret;
    int failed;

    /*
     * This will need to be revisited when we bump SCF_VERSION
     */
    if (v != SCF_VERSION) {
        (void) scf_set_error(SCF_ERROR_VERSION_MISMATCH);
        return (NULL);
    }

    if (!lowlevel_init()) {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    ret = uu_zalloc(sizeof (*ret));
    if (ret == NULL) {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    ret->rh_dataels = uu_list_create(datael_pool, ret, 0);
    ret->rh_iters = uu_list_create(iter_pool, ret, 0);
    if (ret->rh_dataels == NULL || ret->rh_iters == NULL) {
        if (ret->rh_dataels != NULL)
            uu_list_destroy(ret->rh_dataels);
        if (ret->rh_iters != NULL)
            uu_list_destroy(ret->rh_iters);
        uu_free(ret);
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    ret->rh_doorfd = -1;
    ret->rh_doorfd_old = -1;
    (void) pthread_mutex_init(&ret->rh_lock, NULL);

    handle_hold_subhandles(ret, RH_HOLD_ALL);

    failed = ((ret->rh_iter = scf_iter_create(ret)) == NULL ||
        (ret->rh_scope = scf_scope_create(ret)) == NULL ||
        (ret->rh_service = scf_service_create(ret)) == NULL ||
        (ret->rh_instance = scf_instance_create(ret)) == NULL ||
        (ret->rh_snapshot = scf_snapshot_create(ret)) == NULL ||
        (ret->rh_snaplvl = scf_snaplevel_create(ret)) == NULL ||
        (ret->rh_pg = scf_pg_create(ret)) == NULL ||
        (ret->rh_property = scf_property_create(ret)) == NULL ||
        (ret->rh_value = scf_value_create(ret)) == NULL);

    /*
     * these subhandles count as internal references, not external ones.
     */
    ret->rh_intrefs = ret->rh_extrefs;
    ret->rh_extrefs = 0;
    handle_rele_subhandles(ret, RH_HOLD_ALL);

    if (failed) {
        scf_handle_destroy(ret);
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    scf_value_set_count(ret->rh_value, default_debug);
    (void) scf_handle_decorate(ret, "debug", ret->rh_value);

    return (ret);
}

int
scf_handle_decorate(scf_handle_t *handle, const char *name, scf_value_t *v)
{
    if (v != SCF_DECORATE_CLEAR && handle != v->value_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&handle->rh_lock);
    if (handle_is_bound(handle)) {
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return (scf_set_error(SCF_ERROR_IN_USE));
    }
    (void) pthread_mutex_unlock(&handle->rh_lock);

    if (strcmp(name, "debug") == 0) {
        if (v == SCF_DECORATE_CLEAR) {
            (void) pthread_mutex_lock(&handle->rh_lock);
            handle->rh_debug = 0;
            (void) pthread_mutex_unlock(&handle->rh_lock);
        } else {
            uint64_t val;
            if (scf_value_get_count(v, &val) < 0)
                return (-1);        /* error already set */

            (void) pthread_mutex_lock(&handle->rh_lock);
            handle->rh_debug = (uid_t)val;
            (void) pthread_mutex_unlock(&handle->rh_lock);
        }
        return (0);
    }
    if (strcmp(name, "door_path") == 0) {
        char name[sizeof (handle->rh_doorpath)];

        if (v == SCF_DECORATE_CLEAR) {
            (void) pthread_mutex_lock(&handle->rh_lock);
            handle->rh_doorpath[0] = 0;
            (void) pthread_mutex_unlock(&handle->rh_lock);
        } else {
            ssize_t len;

            if ((len = scf_value_get_astring(v, name,
                sizeof (name))) < 0) {
                return (-1);        /* error already set */
            }
            if (len == 0 || len >= sizeof (name)) {
                return (scf_set_error(
                    SCF_ERROR_INVALID_ARGUMENT));
            }
            (void) pthread_mutex_lock(&handle->rh_lock);
            (void) strlcpy(handle->rh_doorpath, name,
                sizeof (handle->rh_doorpath));
            (void) pthread_mutex_unlock(&handle->rh_lock);
        }
        return (0);
    }
    return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
}

/*
 * fails with INVALID_ARGUMENT and HANDLE_MISMATCH.
 */
int
_scf_handle_decorations(scf_handle_t *handle, scf_decoration_func *f,
    scf_value_t *v, void *data)
{
    scf_decoration_info_t i;
    char name[sizeof (handle->rh_doorpath)];
    uint64_t debug;

    if (f == NULL || v == NULL)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    if (v->value_handle != handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    i.sdi_name = (const char *)"debug";
    i.sdi_type = SCF_TYPE_COUNT;
    (void) pthread_mutex_lock(&handle->rh_lock);
    debug = handle->rh_debug;
    (void) pthread_mutex_unlock(&handle->rh_lock);
    if (debug != 0) {
        scf_value_set_count(v, debug);
        i.sdi_value = v;
    } else {
        i.sdi_value = SCF_DECORATE_CLEAR;
    }

    if ((*f)(&i, data) == 0)
        return (0);

    i.sdi_name = (const char *)"door_path";
    i.sdi_type = SCF_TYPE_ASTRING;
    (void) pthread_mutex_lock(&handle->rh_lock);
    (void) strlcpy(name, handle->rh_doorpath, sizeof (name));
    (void) pthread_mutex_unlock(&handle->rh_lock);
    if (name[0] != 0) {
        (void) scf_value_set_astring(v, name);
        i.sdi_value = v;
    } else {
        i.sdi_value = SCF_DECORATE_CLEAR;
    }

    if ((*f)(&i, data) == 0)
        return (0);

    return (1);
}

/*
 * Fails if handle is not bound.
 */
static int
handle_unbind_unlocked(scf_handle_t *handle)
{
    rep_protocol_request_t request;
    rep_protocol_response_t response;

    if (!handle_is_bound(handle))
        return (-1);

    request.rpr_request = REP_PROTOCOL_CLOSE;

    (void) make_door_call(handle, &request, sizeof (request),
        &response, sizeof (response));

    handle_do_close(handle);

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _HANDLE_DESTROYED - dp's handle has been destroyed
 *   _INTERNAL - server response too big
 *       entity already set up with different type
 *   _NO_RESOURCES - server out of memory
 */
static int
datael_attach(scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_setup request;
    rep_protocol_response_t response;
    ssize_t r;

    assert(MUTEX_HELD(&h->rh_lock));

    dp->rd_reset = 0;       /* setup implicitly resets */

    if (h->rh_flags & HANDLE_DEAD)
        return (scf_set_error(SCF_ERROR_HANDLE_DESTROYED));

    if (!handle_is_bound(h))
        return (SCF_SUCCESS);       /* nothing to do */

    request.rpr_request = REP_PROTOCOL_ENTITY_SETUP;
    request.rpr_entityid = dp->rd_entity;
    request.rpr_entitytype = dp->rd_type;

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r == NOT_BOUND || r == CALL_FAILED)
        return (SCF_SUCCESS);
    if (r == RESULT_TOO_BIG)
        return (scf_set_error(SCF_ERROR_INTERNAL));

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _HANDLE_DESTROYED - iter's handle has been destroyed
 *   _INTERNAL - server response too big
 *       iter already existed
 *   _NO_RESOURCES
 */
static int
iter_attach(scf_iter_t *iter)
{
    scf_handle_t *h = iter->iter_handle;
    struct rep_protocol_iter_request request;
    struct rep_protocol_response response;
    int r;

    assert(MUTEX_HELD(&h->rh_lock));

    if (h->rh_flags & HANDLE_DEAD)
        return (scf_set_error(SCF_ERROR_HANDLE_DESTROYED));

    if (!handle_is_bound(h))
        return (SCF_SUCCESS);       /* nothing to do */

    request.rpr_request = REP_PROTOCOL_ITER_SETUP;
    request.rpr_iterid = iter->iter_id;

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r == NOT_BOUND || r == CALL_FAILED)
        return (SCF_SUCCESS);
    if (r == RESULT_TOO_BIG)
        return (scf_set_error(SCF_ERROR_INTERNAL));

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _IN_USE - handle already bound
 *   _NO_SERVER - server door could not be open()ed
 *        door call failed
 *        door_info() failed
 *   _VERSION_MISMATCH - server returned bad file descriptor
 *           server claimed bad request
 *           server reported version mismatch
 *           server refused with unknown reason
 *   _INVALID_ARGUMENT
 *   _NO_RESOURCES - server is out of memory
 *   _PERMISSION_DENIED
 *   _INTERNAL - could not set up entities or iters
 *       server response too big
 *
 * perhaps this should try multiple times.
 */
int
scf_handle_bind(scf_handle_t *handle)
{
    scf_datael_t *el;
    scf_iter_t *iter;

    pid_t pid;
    int fd;
    int res;
    door_info_t info;
    repository_door_request_t request;
    repository_door_response_t response;
    const char *door_name = default_door_path;

    (void) pthread_mutex_lock(&handle->rh_lock);
    if (handle_is_bound(handle)) {
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return (scf_set_error(SCF_ERROR_IN_USE));
    }

    /* wait until any active fd users have cleared out */
    while (handle->rh_fd_users > 0)
        (void) PTHREAD_COND_WAIT(&handle->rh_cv, &handle->rh_lock);

    /* check again, since we had to drop the lock */
    if (handle_is_bound(handle)) {
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return (scf_set_error(SCF_ERROR_IN_USE));
    }

    assert(handle->rh_doorfd == -1 && handle->rh_doorfd_old == -1);

    if (handle->rh_doorpath[0] != 0)
        door_name = handle->rh_doorpath;

    fd = open(door_name, O_RDONLY, 0);
    if (fd == -1) {
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return (scf_set_error(SCF_ERROR_NO_SERVER));
    }

    request.rdr_version = REPOSITORY_DOOR_VERSION;
    request.rdr_request = REPOSITORY_DOOR_REQUEST_CONNECT;
    request.rdr_flags = handle->rh_flags;
    request.rdr_debug = handle->rh_debug;

    pid = getpid();

    res = make_door_call_retfd(fd, &request, sizeof (request),
        &response, sizeof (response), &handle->rh_doorfd);

    (void) close(fd);

    if (res < 0) {
        (void) pthread_mutex_unlock(&handle->rh_lock);

        assert(res != NOT_BOUND);
        if (res == CALL_FAILED)
            return (scf_set_error(SCF_ERROR_NO_SERVER));
        assert(res == RESULT_TOO_BIG);
        return (scf_set_error(SCF_ERROR_INTERNAL));
    }

    if (handle->rh_doorfd < 0) {
        (void) pthread_mutex_unlock(&handle->rh_lock);

        switch (response.rdr_status) {
        case REPOSITORY_DOOR_SUCCESS:
            return (scf_set_error(SCF_ERROR_VERSION_MISMATCH));

        case REPOSITORY_DOOR_FAIL_BAD_REQUEST:
            return (scf_set_error(SCF_ERROR_VERSION_MISMATCH));

        case REPOSITORY_DOOR_FAIL_VERSION_MISMATCH:
            return (scf_set_error(SCF_ERROR_VERSION_MISMATCH));

        case REPOSITORY_DOOR_FAIL_BAD_FLAG:
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

        case REPOSITORY_DOOR_FAIL_NO_RESOURCES:
            return (scf_set_error(SCF_ERROR_NO_RESOURCES));

        case REPOSITORY_DOOR_FAIL_PERMISSION_DENIED:
            return (scf_set_error(SCF_ERROR_PERMISSION_DENIED));

        default:
            return (scf_set_error(SCF_ERROR_VERSION_MISMATCH));
        }
    }

    (void) fcntl(handle->rh_doorfd, F_SETFD, FD_CLOEXEC);

    if (door_info(handle->rh_doorfd, &info) < 0) {
        (void) close(handle->rh_doorfd);
        handle->rh_doorfd = -1;

        (void) pthread_mutex_unlock(&handle->rh_lock);
        return (scf_set_error(SCF_ERROR_NO_SERVER));
    }

    handle->rh_doorpid = pid;
    handle->rh_doorid = info.di_uniquifier;

    /*
     * Now, re-attach everything
     */
    for (el = uu_list_first(handle->rh_dataels); el != NULL;
        el = uu_list_next(handle->rh_dataels, el)) {
        if (datael_attach(el) == -1) {
            assert(scf_error() != SCF_ERROR_HANDLE_DESTROYED);
            (void) handle_unbind_unlocked(handle);
            (void) pthread_mutex_unlock(&handle->rh_lock);
            return (-1);
        }
    }

    for (iter = uu_list_first(handle->rh_iters); iter != NULL;
        iter = uu_list_next(handle->rh_iters, iter)) {
        if (iter_attach(iter) == -1) {
            assert(scf_error() != SCF_ERROR_HANDLE_DESTROYED);
            (void) handle_unbind_unlocked(handle);
            (void) pthread_mutex_unlock(&handle->rh_lock);
            return (-1);
        }
    }
    (void) pthread_mutex_unlock(&handle->rh_lock);
    return (SCF_SUCCESS);
}

int
scf_handle_unbind(scf_handle_t *handle)
{
    int ret;
    (void) pthread_mutex_lock(&handle->rh_lock);
    ret = handle_unbind_unlocked(handle);
    (void) pthread_mutex_unlock(&handle->rh_lock);
    return (ret == SCF_SUCCESS ? ret : scf_set_error(SCF_ERROR_NOT_BOUND));
}

static scf_handle_t *
handle_get(scf_handle_t *h)
{
    (void) pthread_mutex_lock(&h->rh_lock);
    if (h->rh_flags & HANDLE_DEAD) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        (void) scf_set_error(SCF_ERROR_HANDLE_DESTROYED);
        return (NULL);
    }
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (h);
}

/*
 * Called when an object is removed from the handle.  On the last remove,
 * cleans up and frees the handle.
 */
static void
handle_unrefed(scf_handle_t *handle)
{
    scf_iter_t *iter;
    scf_value_t *v;
    scf_scope_t *sc;
    scf_service_t *svc;
    scf_instance_t *inst;
    scf_snapshot_t *snap;
    scf_snaplevel_t *snaplvl;
    scf_propertygroup_t *pg;
    scf_property_t *prop;

    assert(MUTEX_HELD(&handle->rh_lock));

    /*
     * Don't do anything if the handle has not yet been destroyed, there
     * are still external references, or we're already doing unrefed
     * handling.
     */
    if (!(handle->rh_flags & HANDLE_DEAD) ||
        handle->rh_extrefs > 0 ||
        handle->rh_fd_users > 0 ||
        (handle->rh_flags & HANDLE_UNREFED)) {
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return;
    }

    handle->rh_flags |= HANDLE_UNREFED;

    /*
     * Now that we know that there are no external references, and the
     * HANDLE_DEAD flag keeps new ones from appearing, we can clean up
     * our subhandles and destroy the handle completely.
     */
    assert(handle->rh_intrefs >= 0);
    handle->rh_extrefs = handle->rh_intrefs;
    handle->rh_intrefs = 0;
    (void) pthread_mutex_unlock(&handle->rh_lock);

    handle_hold_subhandles(handle, RH_HOLD_ALL);

    iter = handle->rh_iter;
    sc = handle->rh_scope;
    svc = handle->rh_service;
    inst = handle->rh_instance;
    snap = handle->rh_snapshot;
    snaplvl = handle->rh_snaplvl;
    pg = handle->rh_pg;
    prop = handle->rh_property;
    v = handle->rh_value;

    handle->rh_iter = NULL;
    handle->rh_scope = NULL;
    handle->rh_service = NULL;
    handle->rh_instance = NULL;
    handle->rh_snapshot = NULL;
    handle->rh_snaplvl = NULL;
    handle->rh_pg = NULL;
    handle->rh_property = NULL;
    handle->rh_value = NULL;

    if (iter != NULL)
        scf_iter_destroy(iter);
    if (sc != NULL)
        scf_scope_destroy(sc);
    if (svc != NULL)
        scf_service_destroy(svc);
    if (inst != NULL)
        scf_instance_destroy(inst);
    if (snap != NULL)
        scf_snapshot_destroy(snap);
    if (snaplvl != NULL)
        scf_snaplevel_destroy(snaplvl);
    if (pg != NULL)
        scf_pg_destroy(pg);
    if (prop != NULL)
        scf_property_destroy(prop);
    if (v != NULL)
        scf_value_destroy(v);

    (void) pthread_mutex_lock(&handle->rh_lock);

    /* there should be no outstanding children at this point */
    assert(handle->rh_extrefs == 0);
    assert(handle->rh_intrefs == 0);
    assert(handle->rh_values == 0);
    assert(handle->rh_entries == 0);
    assert(uu_list_numnodes(handle->rh_dataels) == 0);
    assert(uu_list_numnodes(handle->rh_iters) == 0);

    uu_list_destroy(handle->rh_dataels);
    uu_list_destroy(handle->rh_iters);
    handle->rh_dataels = NULL;
    handle->rh_iters = NULL;
    (void) pthread_mutex_unlock(&handle->rh_lock);

    (void) pthread_mutex_destroy(&handle->rh_lock);

    uu_free(handle);
}

void
scf_handle_destroy(scf_handle_t *handle)
{
    if (handle == NULL)
        return;

    (void) pthread_mutex_lock(&handle->rh_lock);
    if (handle->rh_flags & HANDLE_DEAD) {
        /*
         * This is an error (you are not allowed to reference the
         * handle after it is destroyed), but we can't report it.
         */
        (void) pthread_mutex_unlock(&handle->rh_lock);
        return;
    }
    handle->rh_flags |= HANDLE_DEAD;
    (void) handle_unbind_unlocked(handle);
    handle_unrefed(handle);
}

ssize_t
scf_myname(scf_handle_t *h, char *out, size_t len)
{
    char *cp;

    if (!handle_has_server(h))
        return (scf_set_error(SCF_ERROR_CONNECTION_BROKEN));

    cp = getenv("SMF_FMRI");
    if (cp == NULL)
        return (scf_set_error(SCF_ERROR_NOT_SET));

    return (strlcpy(out, cp, len));
}

static uint32_t
handle_alloc_entityid(scf_handle_t *h)
{
    uint32_t nextid;

    assert(MUTEX_HELD(&h->rh_lock));

    if (uu_list_numnodes(h->rh_dataels) == UINT32_MAX)
        return (0);     /* no ids available */

    /*
     * The following loop assumes that there are not a huge number of
     * outstanding entities when we've wrapped.  If that ends up not
     * being the case, the O(N^2) nature of this search will hurt a lot,
     * and the data structure should be switched to an AVL tree.
     */
    nextid = h->rh_nextentity + 1;
    for (;;) {
        scf_datael_t *cur;

        if (nextid == 0) {
            nextid++;
            h->rh_flags |= HANDLE_WRAPPED_ENTITY;
        }
        if (!(h->rh_flags & HANDLE_WRAPPED_ENTITY))
            break;

        cur = uu_list_find(h->rh_dataels, NULL, &nextid, NULL);
        if (cur == NULL)
            break;      /* not in use */

        if (nextid == h->rh_nextentity)
            return (0); /* wrapped around; no ids available */
        nextid++;
    }

    h->rh_nextentity = nextid;
    return (nextid);
}

static uint32_t
handle_alloc_iterid(scf_handle_t *h)
{
    uint32_t nextid;

    assert(MUTEX_HELD(&h->rh_lock));

    if (uu_list_numnodes(h->rh_iters) == UINT32_MAX)
        return (0);     /* no ids available */

    /* see the comment in handle_alloc_entityid */
    nextid = h->rh_nextiter + 1;
    for (;;) {
        scf_iter_t *cur;

        if (nextid == 0) {
            nextid++;
            h->rh_flags |= HANDLE_WRAPPED_ITER;
        }
        if (!(h->rh_flags & HANDLE_WRAPPED_ITER))
            break;          /* not yet wrapped */

        cur = uu_list_find(h->rh_iters, NULL, &nextid, NULL);
        if (cur == NULL)
            break;      /* not in use */

        if (nextid == h->rh_nextiter)
            return (0); /* wrapped around; no ids available */
        nextid++;
    }

    h->rh_nextiter = nextid;
    return (nextid);
}

static uint32_t
handle_next_changeid(scf_handle_t *handle)
{
    uint32_t nextid;

    assert(MUTEX_HELD(&handle->rh_lock));

    nextid = ++handle->rh_nextchangeid;
    if (nextid == 0)
        nextid = ++handle->rh_nextchangeid;
    return (nextid);
}

/*
 * Fails with
 *   _INVALID_ARGUMENT - h is NULL
 *   _HANDLE_DESTROYED
 *   _INTERNAL - server response too big
 *       entity already set up with different type
 *   _NO_RESOURCES
 */
static int
datael_init(scf_datael_t *dp, scf_handle_t *h, uint32_t type)
{
    int ret;

    if (h == NULL)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    uu_list_node_init(dp, &dp->rd_node, datael_pool);

    dp->rd_handle = h;
    dp->rd_type = type;
    dp->rd_reset = 0;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (h->rh_flags & HANDLE_DEAD) {
        /*
         * we're in undefined territory (the user cannot use a handle
         * directly after it has been destroyed), but we don't want
         * to allow any new references to happen, so we fail here.
         */
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_HANDLE_DESTROYED));
    }
    dp->rd_entity = handle_alloc_entityid(h);
    if (dp->rd_entity == 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        uu_list_node_fini(dp, &dp->rd_node, datael_pool);
        return (scf_set_error(SCF_ERROR_NO_MEMORY));
    }

    ret = datael_attach(dp);
    if (ret == 0) {
        (void) uu_list_insert_before(h->rh_dataels, NULL, dp);
        h->rh_extrefs++;
    } else {
        uu_list_node_fini(dp, &dp->rd_node, datael_pool);
    }
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (ret);
}

static void
datael_destroy(scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_teardown request;
    rep_protocol_response_t response;

    (void) pthread_mutex_lock(&h->rh_lock);
    uu_list_remove(h->rh_dataels, dp);
    --h->rh_extrefs;

    if (handle_is_bound(h)) {
        request.rpr_request = REP_PROTOCOL_ENTITY_TEARDOWN;
        request.rpr_entityid = dp->rd_entity;

        (void) make_door_call(h, &request, sizeof (request),
            &response, sizeof (response));
    }
    handle_unrefed(h);          /* drops h->rh_lock */

    dp->rd_handle = NULL;
}

static scf_handle_t *
datael_handle(const scf_datael_t *dp)
{
    return (handle_get(dp->rd_handle));
}

/*
 * We delay ENTITY_RESETs until right before the entity is used.  By doing
 * them lazily, we remove quite a few unnecessary calls.
 */
static void
datael_do_reset_locked(scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_reset request;
    rep_protocol_response_t response;

    assert(MUTEX_HELD(&h->rh_lock));

    request.rpr_request = REP_PROTOCOL_ENTITY_RESET;
    request.rpr_entityid = dp->rd_entity;

    (void) make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    dp->rd_reset = 0;
}

static void
datael_reset_locked(scf_datael_t *dp)
{
    assert(MUTEX_HELD(&dp->rd_handle->rh_lock));
    dp->rd_reset = 1;
}

static void
datael_reset(scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    dp->rd_reset = 1;
    (void) pthread_mutex_unlock(&h->rh_lock);
}

static void
datael_finish_reset(const scf_datael_t *dp_arg)
{
    scf_datael_t *dp = (scf_datael_t *)dp_arg;

    if (dp->rd_reset)
        datael_do_reset_locked(dp);
}

/*
 * Fails with _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL (server response too
 * big, bad entity id, request not applicable to entity, name too long for
 * buffer), _NOT_SET, _DELETED, or _CONSTRAINT_VIOLATED (snaplevel is not of an
 * instance).
 */
static ssize_t
datael_get_name(const scf_datael_t *dp, char *buf, size_t size, uint32_t type)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_name request;
    struct rep_protocol_name_response response;
    ssize_t r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_NAME;
    request.rpr_entityid = dp->rd_entity;
    request.rpr_answertype = type;

    datael_finish_reset(dp);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        assert(response.rpr_response != REP_PROTOCOL_FAIL_BAD_REQUEST);
        if (response.rpr_response == REP_PROTOCOL_FAIL_NOT_FOUND)
            return (scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED));
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    return (strlcpy(buf, response.rpr_name, size));
}

/*
 * Fails with _HANDLE_MISMATCH, _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL
 * (server response too big, bad element id), _EXISTS (elements have same id),
 * _NOT_SET, _DELETED, _CONSTRAINT_VIOLATED, _NOT_FOUND (scope has no parent),
 * or _SUCCESS.
 */
static int
datael_get_parent(const scf_datael_t *dp, scf_datael_t *pp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_parent request;
    struct rep_protocol_response response;

    ssize_t r;

    if (h != pp->rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_GET_PARENT;
    request.rpr_entityid = dp->rd_entity;
    request.rpr_outid = pp->rd_entity;

    datael_finish_reset(dp);
    datael_finish_reset(pp);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        if (response.rpr_response == REP_PROTOCOL_FAIL_TYPE_MISMATCH)
            return (scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED));
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    return (SCF_SUCCESS);
}

/*
 * Fails with _HANDLE_MISMATCH, _INVALID_ARGUMENT (out does not have type type,
 * name is invalid), _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL (server response
 * too big, bad id, iter already exists, element cannot have children of type,
 * type is invalid, iter was reset, sequence was bad, iter walks values, iter
 * does not walk type entities), _NOT_SET, _DELETED, _NO_RESOURCES,
 * _BACKEND_ACCESS.
 */
static int
datael_get_child_composed_locked(const scf_datael_t *dp, const char *name,
    uint32_t type, scf_datael_t *out, scf_iter_t *iter)
{
    struct rep_protocol_iter_start request;
    struct rep_protocol_iter_read read_request;
    struct rep_protocol_response response;

    scf_handle_t *h = dp->rd_handle;
    ssize_t r;

    if (h != out->rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (out->rd_type != type)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    assert(MUTEX_HELD(&h->rh_lock));
    assert(iter != NULL);

    scf_iter_reset_locked(iter);
    iter->iter_type = type;

    request.rpr_request = REP_PROTOCOL_ITER_START;
    request.rpr_iterid = iter->iter_id;
    request.rpr_entity = dp->rd_entity;
    request.rpr_itertype = type;
    request.rpr_flags = RP_ITER_START_EXACT | RP_ITER_START_COMPOSED;

    if (name == NULL || strlcpy(request.rpr_pattern, name,
        sizeof (request.rpr_pattern)) >= sizeof (request.rpr_pattern)) {
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    datael_finish_reset(dp);
    datael_finish_reset(out);

    /*
     * We hold the handle lock across both door calls, so that they
     * appear atomic.
     */
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    iter->iter_sequence++;

    read_request.rpr_request = REP_PROTOCOL_ITER_READ;
    read_request.rpr_iterid = iter->iter_id;
    read_request.rpr_sequence = iter->iter_sequence;
    read_request.rpr_entityid = out->rd_entity;

    r = make_door_call(h, &read_request, sizeof (read_request),
        &response, sizeof (response));

    scf_iter_reset_locked(iter);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response == REP_PROTOCOL_DONE) {
        return (scf_set_error(SCF_ERROR_NOT_FOUND));
    }

    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        if (response.rpr_response == REP_PROTOCOL_FAIL_NOT_SET ||
            response.rpr_response == REP_PROTOCOL_FAIL_BAD_REQUEST)
            return (scf_set_error(SCF_ERROR_INTERNAL));
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    return (0);
}

/*
 * Fails with _HANDLE_MISMATCH, _INVALID_ARGUMENT (out does not have type type,
 * name is invalid), _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL (server response
 * too big, bad id, element cannot have children of type, type is invalid),
 * _NOT_SET, _DELETED, _NO_RESOURCES, _BACKEND_ACCESS.
 */
static int
datael_get_child_locked(const scf_datael_t *dp, const char *name,
    uint32_t type, scf_datael_t *out)
{
    struct rep_protocol_entity_get_child request;
    struct rep_protocol_response response;

    scf_handle_t *h = dp->rd_handle;
    ssize_t r;

    if (h != out->rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (out->rd_type != type)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    assert(MUTEX_HELD(&h->rh_lock));

    request.rpr_request = REP_PROTOCOL_ENTITY_GET_CHILD;
    request.rpr_entityid = dp->rd_entity;
    request.rpr_childid = out->rd_entity;

    if (name == NULL || strlcpy(request.rpr_name, name,
        sizeof (request.rpr_name)) >= sizeof (request.rpr_name)) {
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    datael_finish_reset(dp);
    datael_finish_reset(out);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));
    return (0);
}

static int
datael_get_child(const scf_datael_t *dp, const char *name, uint32_t type,
    scf_datael_t *out, boolean_t composed)
{
    scf_handle_t *h = dp->rd_handle;
    uint32_t held = 0;
    int ret;

    scf_iter_t *iter = NULL;

    if (composed)
        iter = HANDLE_HOLD_ITER(h);

    if (out == NULL) {
        switch (type) {
        case REP_PROTOCOL_ENTITY_SERVICE:
            out = &HANDLE_HOLD_SERVICE(h)->rd_d;
            held = RH_HOLD_SERVICE;
            break;

        case REP_PROTOCOL_ENTITY_INSTANCE:
            out = &HANDLE_HOLD_INSTANCE(h)->rd_d;
            held = RH_HOLD_INSTANCE;
            break;

        case REP_PROTOCOL_ENTITY_SNAPSHOT:
            out = &HANDLE_HOLD_SNAPSHOT(h)->rd_d;
            held = RH_HOLD_SNAPSHOT;
            break;

        case REP_PROTOCOL_ENTITY_SNAPLEVEL:
            out = &HANDLE_HOLD_SNAPLVL(h)->rd_d;
            held = RH_HOLD_SNAPLVL;
            break;

        case REP_PROTOCOL_ENTITY_PROPERTYGRP:
            out = &HANDLE_HOLD_PG(h)->rd_d;
            held = RH_HOLD_PG;
            break;

        case REP_PROTOCOL_ENTITY_PROPERTY:
            out = &HANDLE_HOLD_PROPERTY(h)->rd_d;
            held = RH_HOLD_PROPERTY;
            break;

        default:
            assert(0);
            abort();
        }
    }

    (void) pthread_mutex_lock(&h->rh_lock);
    if (composed)
        ret = datael_get_child_composed_locked(dp, name, type, out,
            iter);
    else
        ret = datael_get_child_locked(dp, name, type, out);
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (composed)
        HANDLE_RELE_ITER(h);

    if (held)
        handle_rele_subhandles(h, held);

    return (ret);
}

/*
 * Fails with
 *   _HANDLE_MISMATCH
 *   _INVALID_ARGUMENT - name is too long
 *           invalid changeid
 *           name is invalid
 *           cannot create children for dp's type of node
 *   _NOT_BOUND - handle is not bound
 *   _CONNECTION_BROKEN - server is not reachable
 *   _INTERNAL - server response too big
 *       dp or cp has unknown id
 *       type is _PROPERTYGRP
 *       type is invalid
 *       dp cannot have children of type type
 *       database is corrupt
 *   _EXISTS - dp & cp have the same id
 *   _EXISTS - child already exists
 *   _DELETED - dp has been deleted
 *   _NOT_SET - dp is reset
 *   _NO_RESOURCES
 *   _PERMISSION_DENIED
 *   _BACKEND_ACCESS
 *   _BACKEND_READONLY
 */
static int
datael_add_child(const scf_datael_t *dp, const char *name, uint32_t type,
    scf_datael_t *cp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_create_child request;
    struct rep_protocol_response response;
    ssize_t r;
    uint32_t held = 0;

    if (cp == NULL) {
        switch (type) {
        case REP_PROTOCOL_ENTITY_SCOPE:
            cp = &HANDLE_HOLD_SCOPE(h)->rd_d;
            held = RH_HOLD_SCOPE;
            break;
        case REP_PROTOCOL_ENTITY_SERVICE:
            cp = &HANDLE_HOLD_SERVICE(h)->rd_d;
            held = RH_HOLD_SERVICE;
            break;
        case REP_PROTOCOL_ENTITY_INSTANCE:
            cp = &HANDLE_HOLD_INSTANCE(h)->rd_d;
            held = RH_HOLD_INSTANCE;
            break;
        case REP_PROTOCOL_ENTITY_SNAPSHOT:
        default:
            assert(0);
            abort();
        }
        assert(h == cp->rd_handle);

    } else if (h != cp->rd_handle) {
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));
    }

    if (strlcpy(request.rpr_name, name, sizeof (request.rpr_name)) >=
        sizeof (request.rpr_name)) {
        r = scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        goto err;
    }

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_CREATE_CHILD;
    request.rpr_entityid = dp->rd_entity;
    request.rpr_childtype = type;
    request.rpr_childid = cp->rd_entity;

    datael_finish_reset(dp);
    request.rpr_changeid = handle_next_changeid(h);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (held)
        handle_rele_subhandles(h, held);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);

err:
    if (held)
        handle_rele_subhandles(h, held);
    return (r);
}

static int
datael_add_pg(const scf_datael_t *dp, const char *name, const char *type,
    uint32_t flags, scf_datael_t *cp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_create_pg request;
    struct rep_protocol_response response;
    ssize_t r;

    int holding_els = 0;

    if (cp == NULL) {
        holding_els = 1;
        cp = &HANDLE_HOLD_PG(h)->rd_d;
        assert(h == cp->rd_handle);

    } else if (h != cp->rd_handle) {
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));
    }

    request.rpr_request = REP_PROTOCOL_ENTITY_CREATE_PG;

    if (name == NULL || strlcpy(request.rpr_name, name,
        sizeof (request.rpr_name)) > sizeof (request.rpr_name)) {
        r = scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        goto err;
    }

    if (type == NULL || strlcpy(request.rpr_type, type,
        sizeof (request.rpr_type)) > sizeof (request.rpr_type)) {
        r = scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        goto err;
    }

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_entityid = dp->rd_entity;
    request.rpr_childid = cp->rd_entity;
    request.rpr_flags = flags;

    datael_finish_reset(dp);
    datael_finish_reset(cp);
    request.rpr_changeid = handle_next_changeid(h);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (holding_els)
        HANDLE_RELE_PG(h);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);

err:
    if (holding_els)
        HANDLE_RELE_PG(h);
    return (r);
}

static int
datael_delete(const scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_delete request;
    struct rep_protocol_response response;
    ssize_t r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_DELETE;
    request.rpr_entityid = dp->rd_entity;

    datael_finish_reset(dp);
    request.rpr_changeid = handle_next_changeid(h);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _INVALID_ARGUMENT - h is NULL
 *   _NO_MEMORY
 *   _HANDLE_DESTROYED - h has been destroyed
 *   _INTERNAL - server response too big
 *       iter already exists
 *   _NO_RESOURCES
 */
scf_iter_t *
scf_iter_create(scf_handle_t *h)
{
    scf_iter_t *iter;

    if (h == NULL) {
        (void) scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        return (NULL);
    }

    iter = uu_zalloc(sizeof (*iter));
    if (iter == NULL) {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    uu_list_node_init(iter, &iter->iter_node, iter_pool);
    iter->iter_handle = h;
    iter->iter_sequence = 1;
    iter->iter_type = REP_PROTOCOL_ENTITY_NONE;

    (void) pthread_mutex_lock(&h->rh_lock);
    iter->iter_id = handle_alloc_iterid(h);
    if (iter->iter_id == 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        uu_list_node_fini(iter, &iter->iter_node, iter_pool);
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }
    if (iter_attach(iter) == -1) {
        uu_list_node_fini(iter, &iter->iter_node, iter_pool);
        (void) pthread_mutex_unlock(&h->rh_lock);
        uu_free(iter);
        return (NULL);
    }
    (void) uu_list_insert_before(h->rh_iters, NULL, iter);
    h->rh_extrefs++;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (iter);
}

scf_handle_t *
scf_iter_handle(const scf_iter_t *iter)
{
    return (handle_get(iter->iter_handle));
}

static void
scf_iter_reset_locked(scf_iter_t *iter)
{
    struct rep_protocol_iter_request request;
    struct rep_protocol_response response;

    request.rpr_request = REP_PROTOCOL_ITER_RESET;
    request.rpr_iterid = iter->iter_id;

    assert(MUTEX_HELD(&iter->iter_handle->rh_lock));

    (void) make_door_call(iter->iter_handle,
        &request, sizeof (request), &response, sizeof (response));

    iter->iter_type = REP_PROTOCOL_ENTITY_NONE;
    iter->iter_sequence = 1;
}

void
scf_iter_reset(scf_iter_t *iter)
{
    (void) pthread_mutex_lock(&iter->iter_handle->rh_lock);
    scf_iter_reset_locked(iter);
    (void) pthread_mutex_unlock(&iter->iter_handle->rh_lock);
}

void
scf_iter_destroy(scf_iter_t *iter)
{
    scf_handle_t *handle;

    struct rep_protocol_iter_request request;
    struct rep_protocol_response response;

    if (iter == NULL)
        return;

    handle = iter->iter_handle;

    (void) pthread_mutex_lock(&handle->rh_lock);
    request.rpr_request = REP_PROTOCOL_ITER_TEARDOWN;
    request.rpr_iterid = iter->iter_id;

    (void) make_door_call(handle, &request, sizeof (request),
        &response, sizeof (response));

    uu_list_remove(handle->rh_iters, iter);
    --handle->rh_extrefs;
    handle_unrefed(handle);         /* drops h->rh_lock */
    iter->iter_handle = NULL;

    uu_list_node_fini(iter, &iter->iter_node, iter_pool);
    uu_free(iter);
}

static int
handle_get_local_scope_locked(scf_handle_t *handle, scf_scope_t *out)
{
    struct rep_protocol_entity_get request;
    struct rep_protocol_name_response response;
    ssize_t r;

    assert(MUTEX_HELD(&handle->rh_lock));

    if (handle != out->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    request.rpr_request = REP_PROTOCOL_ENTITY_GET;
    request.rpr_entityid = out->rd_d.rd_entity;
    request.rpr_object = RP_ENTITY_GET_MOST_LOCAL_SCOPE;

    datael_finish_reset(&out->rd_d);
    r = make_door_call(handle, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

int
scf_iter_handle_scopes(scf_iter_t *iter, const scf_handle_t *handle)
{
    scf_handle_t *h = iter->iter_handle;
    if (h != handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_iter_reset_locked(iter);

    if (!handle_is_bound(h)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_NOT_BOUND));
    }

    if (!handle_has_server_locked(h)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_CONNECTION_BROKEN));
    }

    iter->iter_type = REP_PROTOCOL_ENTITY_SCOPE;
    iter->iter_sequence = 1;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (0);
}

int
scf_iter_next_scope(scf_iter_t *iter, scf_scope_t *out)
{
    int ret;
    scf_handle_t *h = iter->iter_handle;

    if (h != out->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    if (iter->iter_type == REP_PROTOCOL_ENTITY_NONE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_NOT_SET));
    }
    if (iter->iter_type != REP_PROTOCOL_ENTITY_SCOPE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    if (iter->iter_sequence == 1) {
        if ((ret = handle_get_local_scope_locked(h, out)) ==
            SCF_SUCCESS) {
            iter->iter_sequence++;
            ret = 1;
        }
    } else {
        datael_reset_locked(&out->rd_d);
        ret = 0;
    }
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (ret);
}

int
scf_handle_get_scope(scf_handle_t *h, const char *name, scf_scope_t *out)
{
    int ret;

    if (h != out->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    if (strcmp(name, SCF_SCOPE_LOCAL) == 0) {
        ret = handle_get_local_scope_locked(h, out);
    } else {
        datael_reset_locked(&out->rd_d);
        if (uu_check_name(name, 0) == -1)
            ret = scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        else
            ret = scf_set_error(SCF_ERROR_NOT_FOUND);
    }
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (ret);
}

static int
datael_setup_iter(scf_iter_t *iter, const scf_datael_t *dp, uint32_t res_type,
    boolean_t composed)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_iter_start request;
    struct rep_protocol_response response;

    ssize_t r;

    if (h != iter->iter_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_iter_reset_locked(iter);
    iter->iter_type = res_type;

    request.rpr_request = REP_PROTOCOL_ITER_START;
    request.rpr_iterid = iter->iter_id;
    request.rpr_entity = dp->rd_entity;
    request.rpr_itertype = res_type;
    request.rpr_flags = RP_ITER_START_ALL |
        (composed ? RP_ITER_START_COMPOSED : 0);
    request.rpr_pattern[0] = 0;

    datael_finish_reset(dp);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }
    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    iter->iter_sequence++;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (SCF_SUCCESS);
}

static int
datael_setup_iter_pgtyped(scf_iter_t *iter, const scf_datael_t *dp,
    const char *pgtype, boolean_t composed)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_iter_start request;
    struct rep_protocol_response response;

    ssize_t r;

    if (h != iter->iter_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (pgtype == NULL || strlcpy(request.rpr_pattern, pgtype,
        sizeof (request.rpr_pattern)) >= sizeof (request.rpr_pattern)) {
        scf_iter_reset(iter);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ITER_START;
    request.rpr_iterid = iter->iter_id;
    request.rpr_entity = dp->rd_entity;
    request.rpr_itertype = REP_PROTOCOL_ENTITY_PROPERTYGRP;
    request.rpr_flags = RP_ITER_START_PGTYPE |
        (composed ? RP_ITER_START_COMPOSED : 0);

    datael_finish_reset(dp);
    scf_iter_reset_locked(iter);
    iter->iter_type = REP_PROTOCOL_ENTITY_PROPERTYGRP;

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);

        DOOR_ERRORS_BLOCK(r);
    }
    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    iter->iter_sequence++;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (SCF_SUCCESS);
}

static int
datael_iter_next(scf_iter_t *iter, scf_datael_t *out)
{
    scf_handle_t *h = iter->iter_handle;

    struct rep_protocol_iter_read request;
    struct rep_protocol_response response;
    ssize_t r;

    if (h != out->rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    if (iter->iter_type == REP_PROTOCOL_ENTITY_NONE ||
        iter->iter_sequence == 1) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_NOT_SET));
    }

    if (out->rd_type != iter->iter_type) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    request.rpr_request = REP_PROTOCOL_ITER_READ;
    request.rpr_iterid = iter->iter_id;
    request.rpr_sequence = iter->iter_sequence;
    request.rpr_entityid = out->rd_entity;

    datael_finish_reset(out);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }

    if (response.rpr_response == REP_PROTOCOL_DONE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (0);
    }
    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    iter->iter_sequence++;
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (1);
}

int
scf_iter_scope_services(scf_iter_t *iter, const scf_scope_t *s)
{
    return (datael_setup_iter(iter, &s->rd_d,
        REP_PROTOCOL_ENTITY_SERVICE, 0));
}

int
scf_iter_next_service(scf_iter_t *iter, scf_service_t *out)
{
    return (datael_iter_next(iter, &out->rd_d));
}

int
scf_iter_service_instances(scf_iter_t *iter, const scf_service_t *svc)
{
    return (datael_setup_iter(iter, &svc->rd_d,
        REP_PROTOCOL_ENTITY_INSTANCE, 0));
}

int
scf_iter_next_instance(scf_iter_t *iter, scf_instance_t *out)
{
    return (datael_iter_next(iter, &out->rd_d));
}

int
scf_iter_service_pgs(scf_iter_t *iter, const scf_service_t *svc)
{
    return (datael_setup_iter(iter, &svc->rd_d,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, 0));
}

int
scf_iter_service_pgs_typed(scf_iter_t *iter, const scf_service_t *svc,
    const char *type)
{
    return (datael_setup_iter_pgtyped(iter, &svc->rd_d, type, 0));
}

int
scf_iter_instance_snapshots(scf_iter_t *iter, const scf_instance_t *inst)
{
    return (datael_setup_iter(iter, &inst->rd_d,
        REP_PROTOCOL_ENTITY_SNAPSHOT, 0));
}

int
scf_iter_next_snapshot(scf_iter_t *iter, scf_snapshot_t *out)
{
    return (datael_iter_next(iter, &out->rd_d));
}

int
scf_iter_instance_pgs(scf_iter_t *iter, const scf_instance_t *inst)
{
    return (datael_setup_iter(iter, &inst->rd_d,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, 0));
}

int
scf_iter_instance_pgs_typed(scf_iter_t *iter, const scf_instance_t *inst,
    const char *type)
{
    return (datael_setup_iter_pgtyped(iter, &inst->rd_d, type, 0));
}

int
scf_iter_instance_pgs_composed(scf_iter_t *iter, const scf_instance_t *inst,
    const scf_snapshot_t *snap)
{
    if (snap != NULL && inst->rd_d.rd_handle != snap->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    return (datael_setup_iter(iter, snap ? &snap->rd_d : &inst->rd_d,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, 1));
}

int
scf_iter_instance_pgs_typed_composed(scf_iter_t *iter,
    const scf_instance_t *inst, const scf_snapshot_t *snap, const char *type)
{
    if (snap != NULL && inst->rd_d.rd_handle != snap->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    return (datael_setup_iter_pgtyped(iter,
        snap ? &snap->rd_d : &inst->rd_d, type, 1));
}

int
scf_iter_snaplevel_pgs(scf_iter_t *iter, const scf_snaplevel_t *inst)
{
    return (datael_setup_iter(iter, &inst->rd_d,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, 0));
}

int
scf_iter_snaplevel_pgs_typed(scf_iter_t *iter, const scf_snaplevel_t *inst,
    const char *type)
{
    return (datael_setup_iter_pgtyped(iter, &inst->rd_d, type, 0));
}

int
scf_iter_next_pg(scf_iter_t *iter, scf_propertygroup_t *out)
{
    return (datael_iter_next(iter, &out->rd_d));
}

int
scf_iter_pg_properties(scf_iter_t *iter, const scf_propertygroup_t *pg)
{
    return (datael_setup_iter(iter, &pg->rd_d,
        REP_PROTOCOL_ENTITY_PROPERTY, 0));
}

int
scf_iter_next_property(scf_iter_t *iter, scf_property_t *out)
{
    return (datael_iter_next(iter, &out->rd_d));
}

/*
 * Fails with
 *   _INVALID_ARGUMENT - handle is NULL
 *   _INTERNAL - server response too big
 *       entity already set up with different type
 *   _NO_RESOURCES
 *   _NO_MEMORY
 */
scf_scope_t *
scf_scope_create(scf_handle_t *handle)
{
    scf_scope_t *ret;

    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_SCOPE) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_scope_handle(const scf_scope_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_scope_destroy(scf_scope_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_scope_get_name(const scf_scope_t *rep, char *out, size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

/*ARGSUSED*/
int
scf_scope_get_parent(const scf_scope_t *child, scf_scope_t *parent)
{
    char name[1];

    /* fake up the side-effects */
    datael_reset(&parent->rd_d);
    if (scf_scope_get_name(child, name, sizeof (name)) < 0)
        return (-1);
    return (scf_set_error(SCF_ERROR_NOT_FOUND));
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, or _NO_MEMORY.
 */
scf_service_t *
scf_service_create(scf_handle_t *handle)
{
    scf_service_t *ret;
    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_SERVICE) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

int
scf_scope_add_service(const scf_scope_t *scope, const char *name,
    scf_service_t *svc)
{
    return (datael_add_child(&scope->rd_d, name,
        REP_PROTOCOL_ENTITY_SERVICE, (svc != NULL)? &svc->rd_d : NULL));
}

int
scf_scope_get_service(const scf_scope_t *s, const char *name,
    scf_service_t *svc)
{
    return (datael_get_child(&s->rd_d, name, REP_PROTOCOL_ENTITY_SERVICE,
        svc ? &svc->rd_d : NULL, 0));
}

scf_handle_t *
scf_service_handle(const scf_service_t *val)
{
    return (datael_handle(&val->rd_d));
}

int
scf_service_delete(scf_service_t *svc)
{
    return (datael_delete(&svc->rd_d));
}

int
scf_instance_delete(scf_instance_t *inst)
{
    return (datael_delete(&inst->rd_d));
}

int
scf_pg_delete(scf_propertygroup_t *pg)
{
    return (datael_delete(&pg->rd_d));
}

int
_scf_snapshot_delete(scf_snapshot_t *snap)
{
    return (datael_delete(&snap->rd_d));
}

int
scf_service_add_instance(const scf_service_t *svc, const char *name,
    scf_instance_t *instance)
{
    return (datael_add_child(&svc->rd_d, name,
        REP_PROTOCOL_ENTITY_INSTANCE,
        (instance != NULL)? &instance->rd_d : NULL));
}

int
scf_service_get_instance(const scf_service_t *svc, const char *name,
    scf_instance_t *inst)
{
    return (datael_get_child(&svc->rd_d, name, REP_PROTOCOL_ENTITY_INSTANCE,
        inst ? &inst->rd_d : NULL, 0));
}

int
scf_service_add_pg(const scf_service_t *svc, const char *name,
    const char *type, uint32_t flags, scf_propertygroup_t *pg)
{
    return (datael_add_pg(&svc->rd_d, name, type, flags,
        (pg != NULL)?&pg->rd_d : NULL));
}

int
scf_service_get_pg(const scf_service_t *svc, const char *name,
    scf_propertygroup_t *pg)
{
    return (datael_get_child(&svc->rd_d, name,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, pg ? &pg->rd_d : NULL, 0));
}

int
scf_instance_add_pg(const scf_instance_t *inst, const char *name,
    const char *type, uint32_t flags, scf_propertygroup_t *pg)
{
    return (datael_add_pg(&inst->rd_d, name, type, flags,
        (pg != NULL)?&pg->rd_d : NULL));
}

int
scf_instance_get_snapshot(const scf_instance_t *inst, const char *name,
    scf_snapshot_t *pg)
{
    return (datael_get_child(&inst->rd_d, name,
        REP_PROTOCOL_ENTITY_SNAPSHOT, pg ? &pg->rd_d : NULL, 0));
}

int
scf_instance_get_pg(const scf_instance_t *inst, const char *name,
    scf_propertygroup_t *pg)
{
    return (datael_get_child(&inst->rd_d, name,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, pg ? &pg->rd_d : NULL, 0));
}

int
scf_instance_get_pg_composed(const scf_instance_t *inst,
    const scf_snapshot_t *snap, const char *name, scf_propertygroup_t *pg)
{
    if (snap != NULL && inst->rd_d.rd_handle != snap->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    return (datael_get_child(snap ? &snap->rd_d : &inst->rd_d, name,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, pg ? &pg->rd_d : NULL, 1));
}

int
scf_pg_get_property(const scf_propertygroup_t *pg, const char *name,
    scf_property_t *prop)
{
    return (datael_get_child(&pg->rd_d, name, REP_PROTOCOL_ENTITY_PROPERTY,
        prop ? &prop->rd_d : NULL, 0));
}

void
scf_service_destroy(scf_service_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_service_get_name(const scf_service_t *rep, char *out, size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, or _NO_MEMORY.
 */
scf_instance_t *
scf_instance_create(scf_handle_t *handle)
{
    scf_instance_t *ret;

    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_INSTANCE) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_instance_handle(const scf_instance_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_instance_destroy(scf_instance_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_instance_get_name(const scf_instance_t *rep, char *out, size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, or _NO_MEMORY.
 */
scf_snapshot_t *
scf_snapshot_create(scf_handle_t *handle)
{
    scf_snapshot_t *ret;

    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_SNAPSHOT) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_snapshot_handle(const scf_snapshot_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_snapshot_destroy(scf_snapshot_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_snapshot_get_name(const scf_snapshot_t *rep, char *out, size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, _NO_MEMORY.
 */
scf_snaplevel_t *
scf_snaplevel_create(scf_handle_t *handle)
{
    scf_snaplevel_t *ret;

    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_SNAPLEVEL) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_snaplevel_handle(const scf_snaplevel_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_snaplevel_destroy(scf_snaplevel_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_snaplevel_get_scope_name(const scf_snaplevel_t *rep, char *out, size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len,
        RP_ENTITY_NAME_SNAPLEVEL_SCOPE));
}

ssize_t
scf_snaplevel_get_service_name(const scf_snaplevel_t *rep, char *out,
    size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len,
        RP_ENTITY_NAME_SNAPLEVEL_SERVICE));
}

ssize_t
scf_snaplevel_get_instance_name(const scf_snaplevel_t *rep, char *out,
    size_t len)
{
    return (datael_get_name(&rep->rd_d, out, len,
        RP_ENTITY_NAME_SNAPLEVEL_INSTANCE));
}

int
scf_snaplevel_get_pg(const scf_snaplevel_t *snap, const char *name,
    scf_propertygroup_t *pg)
{
    return (datael_get_child(&snap->rd_d, name,
        REP_PROTOCOL_ENTITY_PROPERTYGRP, pg ? &pg->rd_d : NULL, 0));
}

static int
snaplevel_next(const scf_datael_t *src, scf_snaplevel_t *dst_arg)
{
    scf_handle_t *h = src->rd_handle;
    scf_snaplevel_t *dst = dst_arg;
    struct rep_protocol_entity_pair request;
    struct rep_protocol_response response;
    int r;
    int dups = 0;

    if (h != dst->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (src == &dst->rd_d) {
        dups = 1;
        dst = HANDLE_HOLD_SNAPLVL(h);
    }
    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_NEXT_SNAPLEVEL;
    request.rpr_entity_src = src->rd_entity;
    request.rpr_entity_dst = dst->rd_d.rd_entity;

    datael_finish_reset(src);
    datael_finish_reset(&dst->rd_d);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    /*
     * if we succeeded, we need to swap dst and dst_arg's identity.  We
     * take advantage of the fact that the only in-library knowledge is
     * their entity ids.
     */
    if (dups && r >= 0 &&
        (response.rpr_response == REP_PROTOCOL_SUCCESS ||
        response.rpr_response == REP_PROTOCOL_DONE)) {
        int entity = dst->rd_d.rd_entity;

        dst->rd_d.rd_entity = dst_arg->rd_d.rd_entity;
        dst_arg->rd_d.rd_entity = entity;
    }
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (dups)
        HANDLE_RELE_SNAPLVL(h);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS &&
        response.rpr_response != REP_PROTOCOL_DONE) {
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    return (response.rpr_response == REP_PROTOCOL_SUCCESS) ?
        SCF_SUCCESS : SCF_COMPLETE;
}

int scf_snapshot_get_base_snaplevel(const scf_snapshot_t *base,
    scf_snaplevel_t *out)
{
    return (snaplevel_next(&base->rd_d, out));
}

int scf_snaplevel_get_next_snaplevel(const scf_snaplevel_t *base,
    scf_snaplevel_t *out)
{
    return (snaplevel_next(&base->rd_d, out));
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, or _NO_MEMORY.
 */
scf_propertygroup_t *
scf_pg_create(scf_handle_t *handle)
{
    scf_propertygroup_t *ret;
    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_PROPERTYGRP) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_pg_handle(const scf_propertygroup_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_pg_destroy(scf_propertygroup_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

ssize_t
scf_pg_get_name(const scf_propertygroup_t *pg,  char *out, size_t len)
{
    return (datael_get_name(&pg->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

ssize_t
scf_pg_get_type(const scf_propertygroup_t *pg,  char *out, size_t len)
{
    return (datael_get_name(&pg->rd_d, out, len, RP_ENTITY_NAME_PGTYPE));
}

int
scf_pg_get_flags(const scf_propertygroup_t *pg, uint32_t *out)
{
    char buf[REP_PROTOCOL_NAME_LEN];
    ssize_t res;

    res = datael_get_name(&pg->rd_d, buf, sizeof (buf),
        RP_ENTITY_NAME_PGFLAGS);

    if (res == -1)
        return (-1);

    if (uu_strtouint(buf, out, sizeof (*out), 0, 0, UINT32_MAX) == -1)
        return (scf_set_error(SCF_ERROR_INTERNAL));

    return (0);
}

static int
datael_update(scf_datael_t *dp)
{
    scf_handle_t *h = dp->rd_handle;

    struct rep_protocol_entity_update request;
    struct rep_protocol_response response;

    int r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_UPDATE;
    request.rpr_entityid = dp->rd_entity;

    datael_finish_reset(dp);
    request.rpr_changeid = handle_next_changeid(h);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS &&
        response.rpr_response != REP_PROTOCOL_DONE) {
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    return (response.rpr_response == REP_PROTOCOL_SUCCESS) ?
        SCF_SUCCESS : SCF_COMPLETE;
}

int
scf_pg_update(scf_propertygroup_t *pg)
{
    return (datael_update(&pg->rd_d));
}

int
scf_snapshot_update(scf_snapshot_t *snap)
{
    return (datael_update(&snap->rd_d));
}

int
_scf_pg_wait(scf_propertygroup_t *pg, int timeout)
{
    scf_handle_t *h = pg->rd_d.rd_handle;

    struct rep_protocol_propertygrp_request request;
    struct rep_protocol_response response;

    struct pollfd pollfd;

    int r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_PROPERTYGRP_SETUP_WAIT;
    request.rpr_entityid = pg->rd_d.rd_entity;

    datael_finish_reset(&pg->rd_d);
    if (!handle_is_bound(h)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_CONNECTION_BROKEN));
    }
    r = make_door_call_retfd(h->rh_doorfd, &request, sizeof (request),
        &response, sizeof (response), &pollfd.fd);
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    assert((response.rpr_response == REP_PROTOCOL_SUCCESS) ==
        (pollfd.fd != -1));

    if (response.rpr_response == REP_PROTOCOL_FAIL_NOT_LATEST)
        return (SCF_SUCCESS);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    pollfd.events = 0;
    pollfd.revents = 0;

    r = poll(&pollfd, 1, timeout * MILLISEC);

    (void) close(pollfd.fd);
    return (pollfd.revents ? SCF_SUCCESS : SCF_COMPLETE);
}

static int
scf_notify_add_pattern(scf_handle_t *h, int type, const char *name)
{
    struct rep_protocol_notify_request request;
    struct rep_protocol_response response;
    int r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_CLIENT_ADD_NOTIFY;
    request.rpr_type = type;
    (void) strlcpy(request.rpr_pattern, name, sizeof (request.rpr_pattern));

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

int
_scf_notify_add_pgname(scf_handle_t *h, const char *name)
{
    return (scf_notify_add_pattern(h, REP_PROTOCOL_NOTIFY_PGNAME, name));
}

int
_scf_notify_add_pgtype(scf_handle_t *h, const char *type)
{
    return (scf_notify_add_pattern(h, REP_PROTOCOL_NOTIFY_PGTYPE, type));
}

int
_scf_notify_wait(scf_propertygroup_t *pg, char *out, size_t sz)
{
    struct rep_protocol_wait_request request;
    struct rep_protocol_fmri_response response;

    scf_handle_t *h = pg->rd_d.rd_handle;
    int dummy;
    int fd;
    int r;

    (void) pthread_mutex_lock(&h->rh_lock);
    datael_finish_reset(&pg->rd_d);
    if (!handle_is_bound(h)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_CONNECTION_BROKEN));
    }
    fd = h->rh_doorfd;
    ++h->rh_fd_users;
    assert(h->rh_fd_users > 0);

    request.rpr_request = REP_PROTOCOL_CLIENT_WAIT;
    request.rpr_entityid = pg->rd_d.rd_entity;
    (void) pthread_mutex_unlock(&h->rh_lock);

    r = make_door_call_retfd(fd, &request, sizeof (request),
        &response, sizeof (response), &dummy);

    (void) pthread_mutex_lock(&h->rh_lock);
    assert(h->rh_fd_users > 0);
    if (--h->rh_fd_users == 0) {
        (void) pthread_cond_broadcast(&h->rh_cv);
        /*
         * check for a delayed close, now that there are no other
         * users.
         */
        if (h->rh_doorfd_old != -1) {
            assert(h->rh_doorfd == -1);
            assert(fd == h->rh_doorfd_old);
            (void) close(h->rh_doorfd_old);
            h->rh_doorfd_old = -1;
        }
    }
    handle_unrefed(h);          /* drops h->rh_lock */

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response == REP_PROTOCOL_DONE)
        return (scf_set_error(SCF_ERROR_NOT_SET));

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    /* the following will be non-zero for delete notifications */
    return (strlcpy(out, response.rpr_fmri, sz));
}

static int
_scf_snapshot_take(scf_instance_t *inst, const char *name,
    scf_snapshot_t *snap, int flags)
{
    scf_handle_t *h = inst->rd_d.rd_handle;

    struct rep_protocol_snapshot_take request;
    struct rep_protocol_response response;

    int r;

    if (h != snap->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (strlcpy(request.rpr_name, (name != NULL)? name : "",
        sizeof (request.rpr_name)) >= sizeof (request.rpr_name))
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_SNAPSHOT_TAKE;
    request.rpr_entityid_src = inst->rd_d.rd_entity;
    request.rpr_entityid_dest = snap->rd_d.rd_entity;
    request.rpr_flags = flags;

    datael_finish_reset(&inst->rd_d);
    datael_finish_reset(&snap->rd_d);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

int
_scf_snapshot_take_new_named(scf_instance_t *inst,
    const char *svcname, const char *instname, const char *snapname,
    scf_snapshot_t *snap)
{
    scf_handle_t *h = inst->rd_d.rd_handle;

    struct rep_protocol_snapshot_take_named request;
    struct rep_protocol_response response;

    int r;

    if (h != snap->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (strlcpy(request.rpr_svcname, svcname,
        sizeof (request.rpr_svcname)) >= sizeof (request.rpr_svcname))
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    if (strlcpy(request.rpr_instname, instname,
        sizeof (request.rpr_instname)) >= sizeof (request.rpr_instname))
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    if (strlcpy(request.rpr_name, snapname,
        sizeof (request.rpr_name)) >= sizeof (request.rpr_name))
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_SNAPSHOT_TAKE_NAMED;
    request.rpr_entityid_src = inst->rd_d.rd_entity;
    request.rpr_entityid_dest = snap->rd_d.rd_entity;

    datael_finish_reset(&inst->rd_d);
    datael_finish_reset(&snap->rd_d);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        assert(response.rpr_response !=
            REP_PROTOCOL_FAIL_TYPE_MISMATCH);
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    return (SCF_SUCCESS);
}

int
_scf_snapshot_take_new(scf_instance_t *inst, const char *name,
    scf_snapshot_t *snap)
{
    return (_scf_snapshot_take(inst, name, snap, REP_SNAPSHOT_NEW));
}

int
_scf_snapshot_take_attach(scf_instance_t *inst, scf_snapshot_t *snap)
{
    return (_scf_snapshot_take(inst, NULL, snap, REP_SNAPSHOT_ATTACH));
}

int
_scf_snapshot_attach(scf_snapshot_t *src, scf_snapshot_t *dest)
{
    scf_handle_t *h = dest->rd_d.rd_handle;

    struct rep_protocol_snapshot_attach request;
    struct rep_protocol_response response;

    int r;

    if (h != src->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_SNAPSHOT_ATTACH;
    request.rpr_entityid_src = src->rd_d.rd_entity;
    request.rpr_entityid_dest = dest->rd_d.rd_entity;

    datael_finish_reset(&src->rd_d);
    datael_finish_reset(&dest->rd_d);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));

    return (SCF_SUCCESS);
}

/*
 * Fails with _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED, _INTERNAL
 * (bad server response or id in use), _NO_RESOURCES, or _NO_MEMORY.
 */
scf_property_t *
scf_property_create(scf_handle_t *handle)
{
    scf_property_t *ret;
    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        if (datael_init(&ret->rd_d, handle,
            REP_PROTOCOL_ENTITY_PROPERTY) == -1) {
            uu_free(ret);
            return (NULL);
        }
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

scf_handle_t *
scf_property_handle(const scf_property_t *val)
{
    return (datael_handle(&val->rd_d));
}

void
scf_property_destroy(scf_property_t *val)
{
    if (val == NULL)
        return;

    datael_destroy(&val->rd_d);
    uu_free(val);
}

static int
property_type_locked(const scf_property_t *prop,
    rep_protocol_value_type_t *out)
{
    scf_handle_t *h = prop->rd_d.rd_handle;

    struct rep_protocol_property_request request;
    struct rep_protocol_integer_response response;

    int r;

    assert(MUTEX_HELD(&h->rh_lock));

    request.rpr_request = REP_PROTOCOL_PROPERTY_GET_TYPE;
    request.rpr_entityid = prop->rd_d.rd_entity;

    datael_finish_reset(&prop->rd_d);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS ||
        r < sizeof (response)) {
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    *out = response.rpr_value;
    return (SCF_SUCCESS);
}

int
scf_property_type(const scf_property_t *prop, scf_type_t *out)
{
    scf_handle_t *h = prop->rd_d.rd_handle;
    rep_protocol_value_type_t out_raw;
    int ret;

    (void) pthread_mutex_lock(&h->rh_lock);
    ret = property_type_locked(prop, &out_raw);
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (ret == SCF_SUCCESS)
        *out = scf_protocol_type_to_type(out_raw);

    return (ret);
}

int
scf_property_is_type(const scf_property_t *prop, scf_type_t base_arg)
{
    scf_handle_t *h = prop->rd_d.rd_handle;
    rep_protocol_value_type_t base = scf_type_to_protocol_type(base_arg);
    rep_protocol_value_type_t type;
    int ret;

    if (base == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    (void) pthread_mutex_lock(&h->rh_lock);
    ret = property_type_locked(prop, &type);
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (ret == SCF_SUCCESS) {
        if (!scf_is_compatible_type(base, type))
            return (scf_set_error(SCF_ERROR_TYPE_MISMATCH));
    }
    return (ret);
}

ssize_t
scf_property_get_name(const scf_property_t *prop, char *out, size_t len)
{
    return (datael_get_name(&prop->rd_d, out, len, RP_ENTITY_NAME_NAME));
}

/*
 * transaction functions
 */

/*
 * Fails with _NO_MEMORY, _INVALID_ARGUMENT (handle is NULL), _HANDLE_DESTROYED,
 * _INTERNAL (bad server response or id in use), or _NO_RESOURCES.
 */
scf_transaction_t *
scf_transaction_create(scf_handle_t *handle)
{
    scf_transaction_t *ret;

    ret = uu_zalloc(sizeof (scf_transaction_t));
    if (ret == NULL) {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }
    if (datael_init(&ret->tran_pg.rd_d, handle,
        REP_PROTOCOL_ENTITY_PROPERTYGRP) == -1) {
        uu_free(ret);
        return (NULL);          /* error already set */
    }
    ret->tran_state = TRAN_STATE_NEW;
    ret->tran_props = uu_list_create(tran_entry_pool, ret, UU_LIST_SORTED);
    if (ret->tran_props == NULL) {
        datael_destroy(&ret->tran_pg.rd_d);
        uu_free(ret);
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }

    return (ret);
}

scf_handle_t *
scf_transaction_handle(const scf_transaction_t *val)
{
    return (handle_get(val->tran_pg.rd_d.rd_handle));
}

int
scf_transaction_start(scf_transaction_t *tran, scf_propertygroup_t *pg)
{
    scf_handle_t *h = tran->tran_pg.rd_d.rd_handle;

    struct rep_protocol_transaction_start request;
    struct rep_protocol_response response;
    int r;

    if (h != pg->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);
    if (tran->tran_state != TRAN_STATE_NEW) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_IN_USE));
    }
    request.rpr_request = REP_PROTOCOL_PROPERTYGRP_TX_START;
    request.rpr_entityid_tx = tran->tran_pg.rd_d.rd_entity;
    request.rpr_entityid = pg->rd_d.rd_entity;

    datael_finish_reset(&tran->tran_pg.rd_d);
    datael_finish_reset(&pg->rd_d);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }

    /* r < sizeof (response) cannot happen because sizeof (response) == 4 */

    if (response.rpr_response != REP_PROTOCOL_SUCCESS ||
        r < sizeof (response)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    tran->tran_state = TRAN_STATE_SETUP;
    tran->tran_invalid = 0;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (SCF_SUCCESS);
}

static void
entry_invalidate(scf_transaction_entry_t *cur, int and_destroy,
    int and_reset_value)
{
    scf_value_t *v, *next;
    scf_transaction_t *tx;
    scf_handle_t *h = cur->entry_handle;

    assert(MUTEX_HELD(&h->rh_lock));

    if ((tx = cur->entry_tx) != NULL) {
        tx->tran_invalid = 1;
        uu_list_remove(tx->tran_props, cur);
        cur->entry_tx = NULL;
    }

    cur->entry_property = NULL;
    cur->entry_state = ENTRY_STATE_INVALID;
    cur->entry_action = REP_PROTOCOL_TX_ENTRY_INVALID;
    cur->entry_type = REP_PROTOCOL_TYPE_INVALID;

    for (v = cur->entry_head; v != NULL; v = next) {
        next = v->value_next;
        v->value_tx = NULL;
        v->value_next = NULL;
        if (and_destroy || and_reset_value)
            scf_value_reset_locked(v, and_destroy);
    }
    cur->entry_head = NULL;
}

static void
entry_destroy_locked(scf_transaction_entry_t *entry)
{
    scf_handle_t *h = entry->entry_handle;

    assert(MUTEX_HELD(&h->rh_lock));

    entry_invalidate(entry, 0, 0);

    entry->entry_handle = NULL;
    assert(h->rh_entries > 0);
    --h->rh_entries;
    --h->rh_extrefs;
    uu_list_node_fini(entry, &entry->entry_link, tran_entry_pool);
    uu_free(entry);
}

static int
transaction_add(scf_transaction_t *tran, scf_transaction_entry_t *entry,
    enum rep_protocol_transaction_action action,
    const char *prop, rep_protocol_value_type_t type)
{
    scf_handle_t *h = tran->tran_pg.rd_d.rd_handle;
    scf_transaction_entry_t *old;
    scf_property_t *prop_p;
    rep_protocol_value_type_t oldtype;
    scf_error_t error = SCF_ERROR_NONE;
    int ret;
    uu_list_index_t idx;

    if (h != entry->entry_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (action == REP_PROTOCOL_TX_ENTRY_DELETE)
        assert(type == REP_PROTOCOL_TYPE_INVALID);
    else if (type == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    prop_p = HANDLE_HOLD_PROPERTY(h);

    (void) pthread_mutex_lock(&h->rh_lock);
    if (tran->tran_state != TRAN_STATE_SETUP) {
        error = SCF_ERROR_NOT_SET;
        goto error;
    }
    if (tran->tran_invalid) {
        error = SCF_ERROR_NOT_SET;
        goto error;
    }

    if (entry->entry_state != ENTRY_STATE_INVALID)
        entry_invalidate(entry, 0, 0);

    old = uu_list_find(tran->tran_props, &prop, NULL, &idx);
    if (old != NULL) {
        error = SCF_ERROR_IN_USE;
        goto error;
    }

    ret = datael_get_child_locked(&tran->tran_pg.rd_d, prop,
        REP_PROTOCOL_ENTITY_PROPERTY, &prop_p->rd_d);
    if (ret == -1 && (error = scf_error()) != SCF_ERROR_NOT_FOUND) {
        goto error;
    }

    switch (action) {
    case REP_PROTOCOL_TX_ENTRY_DELETE:
        if (ret == -1) {
            error = SCF_ERROR_NOT_FOUND;
            goto error;
        }
        break;
    case REP_PROTOCOL_TX_ENTRY_NEW:
        if (ret != -1) {
            error = SCF_ERROR_EXISTS;
            goto error;
        }
        break;

    case REP_PROTOCOL_TX_ENTRY_CLEAR:
    case REP_PROTOCOL_TX_ENTRY_REPLACE:
        if (ret == -1) {
            error = SCF_ERROR_NOT_FOUND;
            goto error;
        }
        if (action == REP_PROTOCOL_TX_ENTRY_CLEAR) {
            if (property_type_locked(prop_p, &oldtype) == -1) {
                error = scf_error();
                goto error;
            }
            if (oldtype != type) {
                error = SCF_ERROR_TYPE_MISMATCH;
                goto error;
            }
        }
        break;
    default:
        assert(0);
        abort();
    }

    (void) strlcpy(entry->entry_namebuf, prop,
        sizeof (entry->entry_namebuf));
    entry->entry_property = entry->entry_namebuf;
    entry->entry_action = action;
    entry->entry_type = type;

    entry->entry_state = ENTRY_STATE_IN_TX_ACTION;
    entry->entry_tx = tran;
    uu_list_insert(tran->tran_props, entry, idx);

    (void) pthread_mutex_unlock(&h->rh_lock);

    HANDLE_RELE_PROPERTY(h);

    return (SCF_SUCCESS);

error:
    (void) pthread_mutex_unlock(&h->rh_lock);

    HANDLE_RELE_PROPERTY(h);

    return (scf_set_error(error));
}

int
scf_transaction_property_new(scf_transaction_t *tx,
    scf_transaction_entry_t *entry, const char *prop, scf_type_t type)
{
    return (transaction_add(tx, entry, REP_PROTOCOL_TX_ENTRY_NEW,
        prop, scf_type_to_protocol_type(type)));
}

int
scf_transaction_property_change(scf_transaction_t *tx,
    scf_transaction_entry_t *entry, const char *prop, scf_type_t type)
{
    return (transaction_add(tx, entry, REP_PROTOCOL_TX_ENTRY_CLEAR,
        prop, scf_type_to_protocol_type(type)));
}

int
scf_transaction_property_change_type(scf_transaction_t *tx,
    scf_transaction_entry_t *entry, const char *prop, scf_type_t type)
{
    return (transaction_add(tx, entry, REP_PROTOCOL_TX_ENTRY_REPLACE,
        prop, scf_type_to_protocol_type(type)));
}

int
scf_transaction_property_delete(scf_transaction_t *tx,
    scf_transaction_entry_t *entry, const char *prop)
{
    return (transaction_add(tx, entry, REP_PROTOCOL_TX_ENTRY_DELETE,
        prop, REP_PROTOCOL_TYPE_INVALID));
}

#define BAD_SIZE (-1UL)

static size_t
commit_value(caddr_t data, scf_value_t *val, rep_protocol_value_type_t t)
{
    size_t len;

    assert(val->value_type == t);

    if (t == REP_PROTOCOL_TYPE_OPAQUE) {
        len = scf_opaque_encode(data, val->value_value,
            val->value_size);
    } else {
        if (data != NULL)
            len = strlcpy(data, val->value_value,
                REP_PROTOCOL_VALUE_LEN);
        else
            len = strlen(val->value_value);
        if (len >= REP_PROTOCOL_VALUE_LEN)
            return (BAD_SIZE);
    }
    return (len + 1);   /* count the '\0' */
}

static size_t
commit_process(scf_transaction_entry_t *cur,
    struct rep_protocol_transaction_cmd *out)
{
    scf_value_t *child;
    size_t sz = 0;
    size_t len;
    caddr_t data = (caddr_t)out->rptc_data;
    caddr_t val_data;

    if (out != NULL) {
        len = strlcpy(data, cur->entry_property, REP_PROTOCOL_NAME_LEN);

        out->rptc_action = cur->entry_action;
        out->rptc_type = cur->entry_type;
        out->rptc_name_len = len + 1;
    } else {
        len = strlen(cur->entry_property);
    }

    if (len >= REP_PROTOCOL_NAME_LEN)
        return (BAD_SIZE);

    len = TX_SIZE(len + 1);

    sz += len;
    val_data = data + len;

    for (child = cur->entry_head; child != NULL;
        child = child->value_next) {
        assert(cur->entry_action != REP_PROTOCOL_TX_ENTRY_DELETE);
        if (out != NULL) {
            len = commit_value(val_data + sizeof (uint32_t), child,
                cur->entry_type);
            /* LINTED alignment */
            *(uint32_t *)val_data = len;
        } else
            len = commit_value(NULL, child, cur->entry_type);

        if (len == BAD_SIZE)
            return (BAD_SIZE);

        len += sizeof (uint32_t);
        len = TX_SIZE(len);

        sz += len;
        val_data += len;
    }

    assert(val_data - data == sz);

    if (out != NULL)
        out->rptc_size = REP_PROTOCOL_TRANSACTION_CMD_SIZE(sz);

    return (REP_PROTOCOL_TRANSACTION_CMD_SIZE(sz));
}

int
scf_transaction_commit(scf_transaction_t *tran)
{
    scf_handle_t *h = tran->tran_pg.rd_d.rd_handle;

    struct rep_protocol_transaction_commit *request;
    struct rep_protocol_response response;
    uintptr_t cmd;
    scf_transaction_entry_t *cur;
    size_t total, size;
    size_t request_size;
    size_t new_total;
    int r;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (tran->tran_state != TRAN_STATE_SETUP ||
        tran->tran_invalid) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    total = 0;
    for (cur = uu_list_first(tran->tran_props); cur != NULL;
        cur = uu_list_next(tran->tran_props, cur)) {
        size = commit_process(cur, NULL);
        if (size == BAD_SIZE) {
            (void) pthread_mutex_unlock(&h->rh_lock);
            return (scf_set_error(SCF_ERROR_INTERNAL));
        }
        assert(TX_SIZE(size) == size);
        total += size;
    }

    request_size = REP_PROTOCOL_TRANSACTION_COMMIT_SIZE(total);
    request = alloca(request_size);
    (void) memset(request, '\0', request_size);
    request->rpr_request = REP_PROTOCOL_PROPERTYGRP_TX_COMMIT;
    request->rpr_entityid = tran->tran_pg.rd_d.rd_entity;
    request->rpr_size = request_size;
    cmd = (uintptr_t)request->rpr_cmd;

    datael_finish_reset(&tran->tran_pg.rd_d);

    new_total = 0;
    for (cur = uu_list_first(tran->tran_props); cur != NULL;
        cur = uu_list_next(tran->tran_props, cur)) {
        size = commit_process(cur, (void *)cmd);
        if (size == BAD_SIZE) {
            (void) pthread_mutex_unlock(&h->rh_lock);
            return (scf_set_error(SCF_ERROR_INTERNAL));
        }
        cmd += size;
        new_total += size;
    }
    assert(new_total == total);

    r = make_door_call(h, request, request_size,
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }

    if (response.rpr_response != REP_PROTOCOL_SUCCESS &&
        response.rpr_response != REP_PROTOCOL_FAIL_NOT_LATEST) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    tran->tran_state = TRAN_STATE_COMMITTED;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (response.rpr_response == REP_PROTOCOL_SUCCESS);
}

static void
transaction_reset(scf_transaction_t *tran)
{
    assert(MUTEX_HELD(&tran->tran_pg.rd_d.rd_handle->rh_lock));

    tran->tran_state = TRAN_STATE_NEW;
    datael_reset_locked(&tran->tran_pg.rd_d);
}

static void
scf_transaction_reset_impl(scf_transaction_t *tran, int and_destroy,
    int and_reset_value)
{
    scf_transaction_entry_t *cur;
    void *cookie;

    (void) pthread_mutex_lock(&tran->tran_pg.rd_d.rd_handle->rh_lock);
    cookie = NULL;
    while ((cur = uu_list_teardown(tran->tran_props, &cookie)) != NULL) {
        cur->entry_tx = NULL;

        assert(cur->entry_state == ENTRY_STATE_IN_TX_ACTION);
        cur->entry_state = ENTRY_STATE_INVALID;

        entry_invalidate(cur, and_destroy, and_reset_value);
        if (and_destroy)
            entry_destroy_locked(cur);
    }
    transaction_reset(tran);
    handle_unrefed(tran->tran_pg.rd_d.rd_handle);
}

void
scf_transaction_reset(scf_transaction_t *tran)
{
    scf_transaction_reset_impl(tran, 0, 0);
}

void
scf_transaction_reset_all(scf_transaction_t *tran)
{
    scf_transaction_reset_impl(tran, 0, 1);
}

void
scf_transaction_destroy(scf_transaction_t *val)
{
    if (val == NULL)
        return;

    scf_transaction_reset(val);

    datael_destroy(&val->tran_pg.rd_d);

    uu_list_destroy(val->tran_props);
    uu_free(val);
}

void
scf_transaction_destroy_children(scf_transaction_t *tran)
{
    scf_transaction_reset_impl(tran, 1, 0);
}

scf_transaction_entry_t *
scf_entry_create(scf_handle_t *h)
{
    scf_transaction_entry_t *ret;

    if (h == NULL) {
        (void) scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        return (NULL);
    }

    ret = uu_zalloc(sizeof (scf_transaction_entry_t));
    if (ret == NULL) {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
        return (NULL);
    }
    ret->entry_action = REP_PROTOCOL_TX_ENTRY_INVALID;
    ret->entry_handle = h;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (h->rh_flags & HANDLE_DEAD) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        uu_free(ret);
        (void) scf_set_error(SCF_ERROR_HANDLE_DESTROYED);
        return (NULL);
    }
    h->rh_entries++;
    h->rh_extrefs++;
    (void) pthread_mutex_unlock(&h->rh_lock);

    uu_list_node_init(ret, &ret->entry_link, tran_entry_pool);

    return (ret);
}

scf_handle_t *
scf_entry_handle(const scf_transaction_entry_t *val)
{
    return (handle_get(val->entry_handle));
}

void
scf_entry_reset(scf_transaction_entry_t *entry)
{
    scf_handle_t *h = entry->entry_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    entry_invalidate(entry, 0, 0);
    (void) pthread_mutex_unlock(&h->rh_lock);
}

void
scf_entry_destroy_children(scf_transaction_entry_t *entry)
{
    scf_handle_t *h = entry->entry_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    entry_invalidate(entry, 1, 0);
    handle_unrefed(h);          /* drops h->rh_lock */
}

void
scf_entry_destroy(scf_transaction_entry_t *entry)
{
    scf_handle_t *h;

    if (entry == NULL)
        return;

    h = entry->entry_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    entry_destroy_locked(entry);
    handle_unrefed(h);          /* drops h->rh_lock */
}

/*
 * Fails with
 *   _HANDLE_MISMATCH
 *   _NOT_SET - has not been added to a transaction
 *   _INTERNAL - entry is corrupt
 *   _INVALID_ARGUMENT - entry's transaction is not started or corrupt
 *           entry is set to delete a property
 *           v is reset or corrupt
 *   _TYPE_MISMATCH - entry & v's types aren't compatible
 *   _IN_USE - v has been added to another entry
 */
int
scf_entry_add_value(scf_transaction_entry_t *entry, scf_value_t *v)
{
    scf_handle_t *h = entry->entry_handle;

    if (h != v->value_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);

    if (entry->entry_state == ENTRY_STATE_INVALID) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_NOT_SET));
    }

    if (entry->entry_state != ENTRY_STATE_IN_TX_ACTION) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INTERNAL));
    }

    if (entry->entry_tx->tran_state != TRAN_STATE_SETUP) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    if (entry->entry_action == REP_PROTOCOL_TX_ENTRY_DELETE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    if (v->value_type == REP_PROTOCOL_TYPE_INVALID) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    if (!scf_is_compatible_type(entry->entry_type, v->value_type)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_TYPE_MISMATCH));
    }

    if (v->value_tx != NULL) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_IN_USE));
    }

    v->value_tx = entry;
    v->value_next = entry->entry_head;
    entry->entry_head = v;
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (SCF_SUCCESS);
}

/*
 * value functions
 */
scf_value_t *
scf_value_create(scf_handle_t *h)
{
    scf_value_t *ret;

    if (h == NULL) {
        (void) scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        return (NULL);
    }

    ret = uu_zalloc(sizeof (*ret));
    if (ret != NULL) {
        ret->value_type = REP_PROTOCOL_TYPE_INVALID;
        ret->value_handle = h;
        (void) pthread_mutex_lock(&h->rh_lock);
        if (h->rh_flags & HANDLE_DEAD) {
            (void) pthread_mutex_unlock(&h->rh_lock);
            uu_free(ret);
            (void) scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
            return (NULL);
        }
        h->rh_values++;
        h->rh_extrefs++;
        (void) pthread_mutex_unlock(&h->rh_lock);
    } else {
        (void) scf_set_error(SCF_ERROR_NO_MEMORY);
    }

    return (ret);
}

static void
scf_value_reset_locked(scf_value_t *val, int and_destroy)
{
    scf_value_t **curp;
    scf_transaction_entry_t *te;

    scf_handle_t *h = val->value_handle;
    assert(MUTEX_HELD(&h->rh_lock));
    if (val->value_tx != NULL) {
        te = val->value_tx;
        te->entry_tx->tran_invalid = 1;

        val->value_tx = NULL;

        for (curp = &te->entry_head; *curp != NULL;
            curp = &(*curp)->value_next) {
            if (*curp == val) {
                *curp = val->value_next;
                curp = NULL;
                break;
            }
        }
        assert(curp == NULL);
    }
    val->value_type = REP_PROTOCOL_TYPE_INVALID;

    if (and_destroy) {
        val->value_handle = NULL;
        assert(h->rh_values > 0);
        --h->rh_values;
        --h->rh_extrefs;
        uu_free(val);
    }
}

void
scf_value_reset(scf_value_t *val)
{
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(val, 0);
    (void) pthread_mutex_unlock(&h->rh_lock);
}

scf_handle_t *
scf_value_handle(const scf_value_t *val)
{
    return (handle_get(val->value_handle));
}

void
scf_value_destroy(scf_value_t *val)
{
    scf_handle_t *h;

    if (val == NULL)
        return;

    h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(val, 1);
    handle_unrefed(h);          /* drops h->rh_lock */
}

scf_type_t
scf_value_base_type(const scf_value_t *val)
{
    rep_protocol_value_type_t t, cur;
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    t = val->value_type;
    (void) pthread_mutex_unlock(&h->rh_lock);

    for (;;) {
        cur = scf_proto_underlying_type(t);
        if (cur == t)
            break;
        t = cur;
    }

    return (scf_protocol_type_to_type(t));
}

scf_type_t
scf_value_type(const scf_value_t *val)
{
    rep_protocol_value_type_t t;
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    t = val->value_type;
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (scf_protocol_type_to_type(t));
}

int
scf_value_is_type(const scf_value_t *val, scf_type_t base_arg)
{
    rep_protocol_value_type_t t;
    rep_protocol_value_type_t base = scf_type_to_protocol_type(base_arg);
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    t = val->value_type;
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (t == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_NOT_SET));
    if (base == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    if (!scf_is_compatible_type(base, t))
        return (scf_set_error(SCF_ERROR_TYPE_MISMATCH));

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _NOT_SET - val is reset
 *   _TYPE_MISMATCH - val's type is not compatible with t
 */
static int
scf_value_check_type(const scf_value_t *val, rep_protocol_value_type_t t)
{
    if (val->value_type == REP_PROTOCOL_TYPE_INVALID) {
        (void) scf_set_error(SCF_ERROR_NOT_SET);
        return (0);
    }
    if (!scf_is_compatible_type(t, val->value_type)) {
        (void) scf_set_error(SCF_ERROR_TYPE_MISMATCH);
        return (0);
    }
    return (1);
}

/*
 * Fails with
 *   _NOT_SET - val is reset
 *   _TYPE_MISMATCH - val is not _TYPE_BOOLEAN
 */
int
scf_value_get_boolean(const scf_value_t *val, uint8_t *out)
{
    char c;
    scf_handle_t *h = val->value_handle;
    uint8_t o;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_TYPE_BOOLEAN)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (-1);
    }

    c = val->value_value[0];
    assert((c == '0' || c == '1') && val->value_value[1] == 0);

    o = (c != '0');
    (void) pthread_mutex_unlock(&h->rh_lock);
    if (out != NULL)
        *out = o;
    return (SCF_SUCCESS);
}

int
scf_value_get_count(const scf_value_t *val, uint64_t *out)
{
    scf_handle_t *h = val->value_handle;
    uint64_t o;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_TYPE_COUNT)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (-1);
    }

    o = strtoull(val->value_value, NULL, 10);
    (void) pthread_mutex_unlock(&h->rh_lock);
    if (out != NULL)
        *out = o;
    return (SCF_SUCCESS);
}

int
scf_value_get_integer(const scf_value_t *val, int64_t *out)
{
    scf_handle_t *h = val->value_handle;
    int64_t o;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_TYPE_INTEGER)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (-1);
    }

    o = strtoll(val->value_value, NULL, 10);
    (void) pthread_mutex_unlock(&h->rh_lock);
    if (out != NULL)
        *out = o;
    return (SCF_SUCCESS);
}

int
scf_value_get_time(const scf_value_t *val, int64_t *sec_out, int32_t *nsec_out)
{
    scf_handle_t *h = val->value_handle;
    char *p;
    int64_t os;
    int32_t ons;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_TYPE_TIME)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (-1);
    }

    os = strtoll(val->value_value, &p, 10);
    if (*p == '.')
        ons = strtoul(p + 1, NULL, 10);
    else
        ons = 0;
    (void) pthread_mutex_unlock(&h->rh_lock);
    if (sec_out != NULL)
        *sec_out = os;
    if (nsec_out != NULL)
        *nsec_out = ons;

    return (SCF_SUCCESS);
}

/*
 * Fails with
 *   _NOT_SET - val is reset
 *   _TYPE_MISMATCH - val's type is not compatible with _TYPE_STRING.
 */
ssize_t
scf_value_get_astring(const scf_value_t *val, char *out, size_t len)
{
    ssize_t ret;
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_TYPE_STRING)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return ((ssize_t)-1);
    }
    ret = (ssize_t)strlcpy(out, val->value_value, len);
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (ret);
}

ssize_t
scf_value_get_ustring(const scf_value_t *val, char *out, size_t len)
{
    ssize_t ret;
    scf_handle_t *h = val->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(val, REP_PROTOCOL_SUBTYPE_USTRING)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return ((ssize_t)-1);
    }
    ret = (ssize_t)strlcpy(out, val->value_value, len);
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (ret);
}

ssize_t
scf_value_get_opaque(const scf_value_t *v, void *out, size_t len)
{
    ssize_t ret;
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (!scf_value_check_type(v, REP_PROTOCOL_TYPE_OPAQUE)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return ((ssize_t)-1);
    }
    if (len > v->value_size)
        len = v->value_size;
    ret = len;

    (void) memcpy(out, v->value_value, len);
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (ret);
}

void
scf_value_set_boolean(scf_value_t *v, uint8_t new)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    v->value_type = REP_PROTOCOL_TYPE_BOOLEAN;
    (void) sprintf(v->value_value, "%d", (new != 0));
    (void) pthread_mutex_unlock(&h->rh_lock);
}

void
scf_value_set_count(scf_value_t *v, uint64_t new)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    v->value_type = REP_PROTOCOL_TYPE_COUNT;
    (void) sprintf(v->value_value, "%llu", (unsigned long long)new);
    (void) pthread_mutex_unlock(&h->rh_lock);
}

void
scf_value_set_integer(scf_value_t *v, int64_t new)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    v->value_type = REP_PROTOCOL_TYPE_INTEGER;
    (void) sprintf(v->value_value, "%lld", (long long)new);
    (void) pthread_mutex_unlock(&h->rh_lock);
}

int
scf_value_set_time(scf_value_t *v, int64_t new_sec, int32_t new_nsec)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    if (new_nsec < 0 || new_nsec >= NANOSEC) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    v->value_type = REP_PROTOCOL_TYPE_TIME;
    if (new_nsec == 0)
        (void) sprintf(v->value_value, "%lld", (long long)new_sec);
    else
        (void) sprintf(v->value_value, "%lld.%09u", (long long)new_sec,
            (unsigned)new_nsec);
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (0);
}

int
scf_value_set_astring(scf_value_t *v, const char *new)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    if (!scf_validate_encoded_value(REP_PROTOCOL_TYPE_STRING, new)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    if (strlcpy(v->value_value, new, sizeof (v->value_value)) >=
        sizeof (v->value_value)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    v->value_type = REP_PROTOCOL_TYPE_STRING;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (0);
}

int
scf_value_set_ustring(scf_value_t *v, const char *new)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    if (!scf_validate_encoded_value(REP_PROTOCOL_SUBTYPE_USTRING, new)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    if (strlcpy(v->value_value, new, sizeof (v->value_value)) >=
        sizeof (v->value_value)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    v->value_type = REP_PROTOCOL_SUBTYPE_USTRING;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (0);
}

int
scf_value_set_opaque(scf_value_t *v, const void *new, size_t len)
{
    scf_handle_t *h = v->value_handle;

    (void) pthread_mutex_lock(&h->rh_lock);
    scf_value_reset_locked(v, 0);
    if (len > sizeof (v->value_value)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }
    (void) memcpy(v->value_value, new, len);
    v->value_size = len;
    v->value_type = REP_PROTOCOL_TYPE_OPAQUE;
    (void) pthread_mutex_unlock(&h->rh_lock);
    return (0);
}

/*
 * Fails with
 *   _NOT_SET - v_arg is reset
 *   _INTERNAL - v_arg is corrupt
 *
 * If t is not _TYPE_INVALID, fails with
 *   _TYPE_MISMATCH - v_arg's type is not compatible with t
 */
static ssize_t
scf_value_get_as_string_common(const scf_value_t *v_arg,
    rep_protocol_value_type_t t, char *buf, size_t bufsz)
{
    scf_handle_t *h = v_arg->value_handle;
    scf_value_t v_s;
    scf_value_t *v = &v_s;
    ssize_t r;
    uint8_t b;

    (void) pthread_mutex_lock(&h->rh_lock);
    if (t != REP_PROTOCOL_TYPE_INVALID && !scf_value_check_type(v_arg, t)) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (-1);
    }

    v_s = *v_arg;           /* copy locally so we can unlock */
    h->rh_values++;         /* keep the handle from going away */
    h->rh_extrefs++;
    (void) pthread_mutex_unlock(&h->rh_lock);


    switch (REP_PROTOCOL_BASE_TYPE(v->value_type)) {
    case REP_PROTOCOL_TYPE_BOOLEAN:
        r = scf_value_get_boolean(v, &b);
        assert(r == SCF_SUCCESS);

        r = strlcpy(buf, b ? "true" : "false", bufsz);
        break;

    case REP_PROTOCOL_TYPE_COUNT:
    case REP_PROTOCOL_TYPE_INTEGER:
    case REP_PROTOCOL_TYPE_TIME:
    case REP_PROTOCOL_TYPE_STRING:
        r = strlcpy(buf, v->value_value, bufsz);
        break;

    case REP_PROTOCOL_TYPE_OPAQUE:
        /*
         * Note that we only write out full hex bytes -- if they're
         * short, and bufsz is even, we'll only fill (bufsz - 2) bytes
         * with data.
         */
        if (bufsz > 0)
            (void) scf_opaque_encode(buf, v->value_value,
                MIN(v->value_size, (bufsz - 1)/2));
        r = (v->value_size * 2);
        break;

    case REP_PROTOCOL_TYPE_INVALID:
        r = scf_set_error(SCF_ERROR_NOT_SET);
        break;

    default:
        r = (scf_set_error(SCF_ERROR_INTERNAL));
        break;
    }

    (void) pthread_mutex_lock(&h->rh_lock);
    h->rh_values--;
    h->rh_extrefs--;
    handle_unrefed(h);

    return (r);
}

ssize_t
scf_value_get_as_string(const scf_value_t *v, char *buf, size_t bufsz)
{
    return (scf_value_get_as_string_common(v, REP_PROTOCOL_TYPE_INVALID,
        buf, bufsz));
}

ssize_t
scf_value_get_as_string_typed(const scf_value_t *v, scf_type_t type,
    char *buf, size_t bufsz)
{
    rep_protocol_value_type_t ty = scf_type_to_protocol_type(type);
    if (ty == REP_PROTOCOL_TYPE_INVALID)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    return (scf_value_get_as_string_common(v, ty, buf, bufsz));
}

int
scf_value_set_from_string(scf_value_t *v, scf_type_t type, const char *str)
{
    scf_handle_t *h = v->value_handle;
    rep_protocol_value_type_t ty;

    switch (type) {
    case SCF_TYPE_BOOLEAN: {
        uint8_t b;

        if (strcmp(str, "true") == 0 || strcmp(str, "t") == 0 ||
            strcmp(str, "1") == 0)
            b = 1;
        else if (strcmp(str, "false") == 0 ||
            strcmp(str, "f") == 0 || strcmp(str, "0") == 0)
            b = 0;
        else {
            goto bad;
        }

        scf_value_set_boolean(v, b);
        return (0);
    }

    case SCF_TYPE_COUNT: {
        uint64_t c;
        char *endp;

        errno = 0;
        c = strtoull(str, &endp, 0);

        if (errno != 0 || endp == str || *endp != '\0')
            goto bad;

        scf_value_set_count(v, c);
        return (0);
    }

    case SCF_TYPE_INTEGER: {
        int64_t i;
        char *endp;

        errno = 0;
        i = strtoll(str, &endp, 0);

        if (errno != 0 || endp == str || *endp != '\0')
            goto bad;

        scf_value_set_integer(v, i);
        return (0);
    }

    case SCF_TYPE_TIME: {
        int64_t s;
        uint32_t ns = 0;
        char *endp, *ns_str;
        size_t len;

        errno = 0;
        s = strtoll(str, &endp, 10);
        if (errno != 0 || endp == str ||
            (*endp != '\0' && *endp != '.'))
            goto bad;

        if (*endp == '.') {
            ns_str = endp + 1;
            len = strlen(ns_str);
            if (len == 0 || len > 9)
                goto bad;

            ns = strtoul(ns_str, &endp, 10);
            if (errno != 0 || endp == ns_str || *endp != '\0')
                goto bad;

            while (len++ < 9)
                ns *= 10;
            assert(ns < NANOSEC);
        }

        return (scf_value_set_time(v, s, ns));
    }

    case SCF_TYPE_ASTRING:
    case SCF_TYPE_USTRING:
    case SCF_TYPE_OPAQUE:
    case SCF_TYPE_URI:
    case SCF_TYPE_FMRI:
    case SCF_TYPE_HOST:
    case SCF_TYPE_HOSTNAME:
    case SCF_TYPE_NET_ADDR_V4:
    case SCF_TYPE_NET_ADDR_V6:
        ty = scf_type_to_protocol_type(type);

        (void) pthread_mutex_lock(&h->rh_lock);
        scf_value_reset_locked(v, 0);
        if (type == SCF_TYPE_OPAQUE) {
            v->value_size = scf_opaque_decode(v->value_value,
                str, sizeof (v->value_value));
            if (!scf_validate_encoded_value(ty, str)) {
                (void) pthread_mutex_lock(&h->rh_lock);
                goto bad;
            }
        } else {
            (void) strlcpy(v->value_value, str,
                sizeof (v->value_value));
            if (!scf_validate_encoded_value(ty, v->value_value)) {
                (void) pthread_mutex_lock(&h->rh_lock);
                goto bad;
            }
        }
        v->value_type = ty;
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (SCF_SUCCESS);

    case REP_PROTOCOL_TYPE_INVALID:
    default:
        scf_value_reset(v);
        return (scf_set_error(SCF_ERROR_TYPE_MISMATCH));
    }
bad:
    scf_value_reset(v);
    return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
}

int
scf_iter_property_values(scf_iter_t *iter, const scf_property_t *prop)
{
    return (datael_setup_iter(iter, &prop->rd_d,
        REP_PROTOCOL_ENTITY_VALUE, 0));
}

int
scf_iter_next_value(scf_iter_t *iter, scf_value_t *v)
{
    scf_handle_t *h = iter->iter_handle;

    struct rep_protocol_iter_read_value request;
    struct rep_protocol_value_response response;

    int r;

    if (h != v->value_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);

    scf_value_reset_locked(v, 0);

    if (iter->iter_type == REP_PROTOCOL_ENTITY_NONE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_NOT_SET));
    }

    if (iter->iter_type != REP_PROTOCOL_ENTITY_VALUE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    request.rpr_request = REP_PROTOCOL_ITER_READ_VALUE;
    request.rpr_iterid = iter->iter_id;
    request.rpr_sequence = iter->iter_sequence;

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }

    if (response.rpr_response == REP_PROTOCOL_DONE) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (0);
    }
    if (response.rpr_response != REP_PROTOCOL_SUCCESS) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        return (scf_set_error(proto_error(response.rpr_response)));
    }
    iter->iter_sequence++;

    v->value_type = response.rpr_type;

    assert(scf_validate_encoded_value(response.rpr_type,
        response.rpr_value));

    if (v->value_type != REP_PROTOCOL_TYPE_OPAQUE) {
        (void) strlcpy(v->value_value, response.rpr_value,
            sizeof (v->value_value));
    } else {
        v->value_size = scf_opaque_decode(v->value_value,
            response.rpr_value, sizeof (v->value_value));
    }
    (void) pthread_mutex_unlock(&h->rh_lock);

    return (1);
}

int
scf_property_get_value(const scf_property_t *prop, scf_value_t *v)
{
    scf_handle_t *h = prop->rd_d.rd_handle;
    struct rep_protocol_property_request request;
    struct rep_protocol_value_response response;
    int r;

    if (h != v->value_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    (void) pthread_mutex_lock(&h->rh_lock);

    request.rpr_request = REP_PROTOCOL_PROPERTY_GET_VALUE;
    request.rpr_entityid = prop->rd_d.rd_entity;

    scf_value_reset_locked(v, 0);
    datael_finish_reset(&prop->rd_d);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));

    if (r < 0) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        DOOR_ERRORS_BLOCK(r);
    }

    if (response.rpr_response != REP_PROTOCOL_SUCCESS &&
        response.rpr_response != REP_PROTOCOL_FAIL_TRUNCATED) {
        (void) pthread_mutex_unlock(&h->rh_lock);
        assert(response.rpr_response !=
            REP_PROTOCOL_FAIL_TYPE_MISMATCH);
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    v->value_type = response.rpr_type;
    if (v->value_type != REP_PROTOCOL_TYPE_OPAQUE) {
        (void) strlcpy(v->value_value, response.rpr_value,
            sizeof (v->value_value));
    } else {
        v->value_size = scf_opaque_decode(v->value_value,
            response.rpr_value, sizeof (v->value_value));
    }
    (void) pthread_mutex_unlock(&h->rh_lock);
    return ((response.rpr_response == REP_PROTOCOL_SUCCESS)?
        SCF_SUCCESS : scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED));
}

int
scf_pg_get_parent_service(const scf_propertygroup_t *pg, scf_service_t *svc)
{
    return (datael_get_parent(&pg->rd_d, &svc->rd_d));
}

int
scf_pg_get_parent_instance(const scf_propertygroup_t *pg, scf_instance_t *inst)
{
    return (datael_get_parent(&pg->rd_d, &inst->rd_d));
}

int
scf_pg_get_parent_snaplevel(const scf_propertygroup_t *pg,
    scf_snaplevel_t *level)
{
    return (datael_get_parent(&pg->rd_d, &level->rd_d));
}

int
scf_service_get_parent(const scf_service_t *svc, scf_scope_t *s)
{
    return (datael_get_parent(&svc->rd_d, &s->rd_d));
}

int
scf_instance_get_parent(const scf_instance_t *inst, scf_service_t *svc)
{
    return (datael_get_parent(&inst->rd_d, &svc->rd_d));
}

int
scf_snapshot_get_parent(const scf_snapshot_t *inst, scf_instance_t *svc)
{
    return (datael_get_parent(&inst->rd_d, &svc->rd_d));
}

int
scf_snaplevel_get_parent(const scf_snaplevel_t *inst, scf_snapshot_t *svc)
{
    return (datael_get_parent(&inst->rd_d, &svc->rd_d));
}

/*
 * FMRI functions
 *
 * Note: In the scf_parse_svc_fmri(), scf_parse_file_fmri() and
 * scf_parse_fmri(), fmri isn't const because that would require
 * allocating memory. Also, note that scope, at least, is not necessarily
 * in the passed in fmri.
 */

int
scf_parse_svc_fmri(char *fmri, const char **scope, const char **service,
    const char **instance, const char **propertygroup, const char **property)
{
    char *s, *e, *te, *tpg;
    char *my_s = NULL, *my_i = NULL, *my_pg = NULL, *my_p = NULL;

    if (scope != NULL)
        *scope = NULL;
    if (service != NULL)
        *service = NULL;
    if (instance != NULL)
        *instance = NULL;
    if (propertygroup != NULL)
        *propertygroup = NULL;
    if (property != NULL)
        *property = NULL;

    s = fmri;
    e = strchr(s, '\0');

    if (strncmp(s, SCF_FMRI_SVC_PREFIX,
        sizeof (SCF_FMRI_SVC_PREFIX) - 1) == 0)
        s += sizeof (SCF_FMRI_SVC_PREFIX) - 1;

    if (strncmp(s, SCF_FMRI_SCOPE_PREFIX,
        sizeof (SCF_FMRI_SCOPE_PREFIX) - 1) == 0) {
        char *my_scope;

        s += sizeof (SCF_FMRI_SCOPE_PREFIX) - 1;
        te = strstr(s, SCF_FMRI_SERVICE_PREFIX);
        if (te == NULL)
            te = e;

        *te = 0;
        my_scope = s;

        s = te;
        if (s < e)
            s += sizeof (SCF_FMRI_SERVICE_PREFIX) - 1;

        /* If the scope ends with the suffix, remove it. */
        te = strstr(my_scope, SCF_FMRI_SCOPE_SUFFIX);
        if (te != NULL && te[sizeof (SCF_FMRI_SCOPE_SUFFIX) - 1] == 0)
            *te = 0;

        /* Validate the scope. */
        if (my_scope[0] == '\0')
            my_scope = SCF_FMRI_LOCAL_SCOPE;
        else if (uu_check_name(my_scope, 0) == -1) {
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
        }

        if (scope != NULL)
            *scope = my_scope;
    } else {
        if (scope != NULL)
            *scope = SCF_FMRI_LOCAL_SCOPE;
    }

    if (s[0] != 0) {
        if (strncmp(s, SCF_FMRI_SERVICE_PREFIX,
            sizeof (SCF_FMRI_SERVICE_PREFIX) - 1) == 0)
            s += sizeof (SCF_FMRI_SERVICE_PREFIX) - 1;

        /*
         * Can't validate service here because it might not be null
         * terminated.
         */
        my_s = s;
    }

    tpg = strstr(s, SCF_FMRI_PROPERTYGRP_PREFIX);
    te = strstr(s, SCF_FMRI_INSTANCE_PREFIX);
    if (te != NULL && (tpg == NULL || te < tpg)) {
        *te = 0;
        te += sizeof (SCF_FMRI_INSTANCE_PREFIX) - 1;

        /* Can't validate instance here either. */
        my_i = s = te;

        te = strstr(s, SCF_FMRI_PROPERTYGRP_PREFIX);
    } else {
        te = tpg;
    }

    if (te != NULL) {
        *te = 0;
        te += sizeof (SCF_FMRI_PROPERTYGRP_PREFIX) - 1;

        my_pg = s = te;
        te = strstr(s, SCF_FMRI_PROPERTY_PREFIX);
        if (te != NULL) {
            *te = 0;
            te += sizeof (SCF_FMRI_PROPERTY_PREFIX) - 1;

            my_p = te;
            s = te;
        }
    }

    if (my_s != NULL) {
        if (uu_check_name(my_s, UU_NAME_DOMAIN | UU_NAME_PATH) == -1)
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

        if (service != NULL)
            *service = my_s;
    }

    if (my_i != NULL) {
        if (uu_check_name(my_i, UU_NAME_DOMAIN) == -1)
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

        if (instance != NULL)
            *instance = my_i;
    }

    if (my_pg != NULL) {
        if (uu_check_name(my_pg, UU_NAME_DOMAIN) == -1)
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

        if (propertygroup != NULL)
            *propertygroup = my_pg;
    }

    if (my_p != NULL) {
        if (uu_check_name(my_p, UU_NAME_DOMAIN) == -1)
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

        if (property != NULL)
            *property = my_p;
    }

    return (0);
}

int
scf_parse_file_fmri(char *fmri, const char **scope, const char **path)
{
    char *s, *e, *te;

    if (scope != NULL)
        *scope = NULL;

    s = fmri;
    e = strchr(s, '\0');

    if (strncmp(s, SCF_FMRI_FILE_PREFIX,
        sizeof (SCF_FMRI_FILE_PREFIX) - 1) == 0)
        s += sizeof (SCF_FMRI_FILE_PREFIX) - 1;

    if (strncmp(s, SCF_FMRI_SCOPE_PREFIX,
        sizeof (SCF_FMRI_SCOPE_PREFIX) - 1) == 0) {
        char *my_scope;

        s += sizeof (SCF_FMRI_SCOPE_PREFIX) - 1;
        te = strstr(s, SCF_FMRI_SERVICE_PREFIX);
        if (te == NULL)
            te = e;

        *te = 0;
        my_scope = s;

        s = te;

        /* Validate the scope. */
        if (my_scope[0] != '\0' &&
            strcmp(my_scope, SCF_FMRI_LOCAL_SCOPE) != 0) {
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
        }

        if (scope != NULL)
            *scope = my_scope;
    } else {
        /*
         * FMRI paths must be absolute
         */
        if (s[0] != '/')
            return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));
    }

    s += sizeof (SCF_FMRI_SERVICE_PREFIX) - 1;

    if (s >= e)
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    /*
     * If the user requests it, return the full path of the file.
     */
    if (path != NULL) {
        assert(s > fmri);
        s[-1] = '/';
        *path = s - 1;
    }

    return (0);
}

int
scf_parse_fmri(char *fmri, int *type, const char **scope, const char **service,
    const char **instance, const char **propertygroup, const char **property)
{
    if (strncmp(fmri, SCF_FMRI_SVC_PREFIX,
        sizeof (SCF_FMRI_SVC_PREFIX) - 1) == 0) {
        if (type)
            *type = SCF_FMRI_TYPE_SVC;
        return (scf_parse_svc_fmri(fmri, scope, service, instance,
                propertygroup, property));
    } else if (strncmp(fmri, SCF_FMRI_FILE_PREFIX,
        sizeof (SCF_FMRI_FILE_PREFIX) - 1) == 0) {
        if (type)
            *type = SCF_FMRI_TYPE_FILE;
        return (scf_parse_file_fmri(fmri, scope, NULL));
    } else {
        /*
         * Parse as a svc if the fmri type is not explicitly
         * specified.
         */
        if (type)
            *type = SCF_FMRI_TYPE_SVC;
        return (scf_parse_svc_fmri(fmri, scope, service, instance,
            propertygroup, property));
    }
}

/*
 * Fails with _INVALID_ARGUMENT.  fmri and buf may be equal.
 */
ssize_t
scf_canonify_fmri(const char *fmri, char *buf, size_t bufsz)
{
    const char *scope, *service, *instance, *pg, *property;
    char local[6 * REP_PROTOCOL_NAME_LEN];
    int r;
    size_t len;

    if (strlcpy(local, fmri, sizeof (local)) >= sizeof (local)) {
        /* Should this be CONSTRAINT_VIOLATED? */
        (void) scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        return (-1);
    }


    r = scf_parse_svc_fmri(local, &scope, &service, &instance, &pg,
        &property);
    if (r != 0)
        return (-1);

    len = strlcpy(buf, "svc:/", bufsz);

    if (scope != NULL && strcmp(scope, SCF_SCOPE_LOCAL) != 0) {
        len += strlcat(buf, "/", bufsz);
        len += strlcat(buf, scope, bufsz);
    }

    if (service)
        len += strlcat(buf, service, bufsz);

    if (instance) {
        len += strlcat(buf, ":", bufsz);
        len += strlcat(buf, instance, bufsz);
    }

    if (pg) {
        len += strlcat(buf, "/:properties/", bufsz);
        len += strlcat(buf, pg, bufsz);
    }

    if (property) {
        len += strlcat(buf, "/", bufsz);
        len += strlcat(buf, property, bufsz);
    }

    return (len);
}

int
scf_handle_decode_fmri(scf_handle_t *h, const char *fmri, scf_scope_t *sc,
    scf_service_t *svc, scf_instance_t *inst, scf_propertygroup_t *pg,
    scf_property_t *prop, int flags)
{
    const char *scope, *service, *instance, *propertygroup, *property;
    int last;
    char local[6 * REP_PROTOCOL_NAME_LEN];
    int ret;
    const uint32_t holds = RH_HOLD_SCOPE | RH_HOLD_SERVICE |
        RH_HOLD_INSTANCE | RH_HOLD_PG | RH_HOLD_PROPERTY;

    /*
     * verify that all handles match
     */
    if ((sc != NULL && h != sc->rd_d.rd_handle) ||
        (svc != NULL && h != svc->rd_d.rd_handle) ||
        (inst != NULL && h != inst->rd_d.rd_handle) ||
        (pg != NULL && h != pg->rd_d.rd_handle) ||
        (prop != NULL && h != prop->rd_d.rd_handle))
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    if (strlcpy(local, fmri, sizeof (local)) >= sizeof (local)) {
        ret = scf_set_error(SCF_ERROR_INVALID_ARGUMENT);
        goto reset_args;
    }

    /*
     * We can simply return from an error in parsing, because
     * scf_parse_fmri sets the error code correctly.
     */
    if (scf_parse_svc_fmri(local, &scope, &service, &instance,
        &propertygroup, &property) == -1) {
        ret = -1;
        goto reset_args;
    }

    /*
     * the FMRI looks valid at this point -- do constraint checks.
     */

    if (instance != NULL && (flags & SCF_DECODE_FMRI_REQUIRE_NO_INSTANCE)) {
        ret = scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED);
        goto reset_args;
    }
    if (instance == NULL && (flags & SCF_DECODE_FMRI_REQUIRE_INSTANCE)) {
        ret = scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED);
        goto reset_args;
    }

    if (prop != NULL)
        last = REP_PROTOCOL_ENTITY_PROPERTY;
    else if (pg != NULL)
        last = REP_PROTOCOL_ENTITY_PROPERTYGRP;
    else if (inst != NULL)
        last = REP_PROTOCOL_ENTITY_INSTANCE;
    else if (svc != NULL)
        last = REP_PROTOCOL_ENTITY_SERVICE;
    else if (sc != NULL)
        last = REP_PROTOCOL_ENTITY_SCOPE;
    else
        last = REP_PROTOCOL_ENTITY_NONE;

    if (flags & SCF_DECODE_FMRI_EXACT) {
        int last_fmri;

        if (property != NULL)
            last_fmri = REP_PROTOCOL_ENTITY_PROPERTY;
        else if (propertygroup != NULL)
            last_fmri = REP_PROTOCOL_ENTITY_PROPERTYGRP;
        else if (instance != NULL)
            last_fmri = REP_PROTOCOL_ENTITY_INSTANCE;
        else if (service != NULL)
            last_fmri = REP_PROTOCOL_ENTITY_SERVICE;
        else if (scope != NULL)
            last_fmri = REP_PROTOCOL_ENTITY_SCOPE;
        else
            last_fmri = REP_PROTOCOL_ENTITY_NONE;

        if (last != last_fmri) {
            ret = scf_set_error(SCF_ERROR_CONSTRAINT_VIOLATED);
            goto reset_args;
        }
    }

    if ((flags & SCF_DECODE_FMRI_TRUNCATE) &&
        last == REP_PROTOCOL_ENTITY_NONE) {
        ret = 0;                /* nothing to do */
        goto reset_args;
    }

    if (!(flags & SCF_DECODE_FMRI_TRUNCATE))
        last = REP_PROTOCOL_ENTITY_NONE;    /* never stop */

    /*
     * passed the constraint checks -- try to grab the thing itself.
     */

    handle_hold_subhandles(h, holds);
    if (sc == NULL)
        sc = h->rh_scope;
    else
        datael_reset(&sc->rd_d);

    if (svc == NULL)
        svc = h->rh_service;
    else
        datael_reset(&svc->rd_d);

    if (inst == NULL)
        inst = h->rh_instance;
    else
        datael_reset(&inst->rd_d);

    if (pg == NULL)
        pg = h->rh_pg;
    else
        datael_reset(&pg->rd_d);

    if (prop == NULL)
        prop = h->rh_property;
    else
        datael_reset(&prop->rd_d);

    /*
     * We only support local scopes, but we check *after* getting
     * the local scope, so that any repository-related errors take
     * precedence.
     */
    if (scf_handle_get_scope(h, SCF_SCOPE_LOCAL, sc) == -1) {
        handle_rele_subhandles(h, holds);
        ret = -1;
        goto reset_args;
    }

    if (scope != NULL && strcmp(scope, SCF_FMRI_LOCAL_SCOPE) != 0) {
        handle_rele_subhandles(h, holds);
        ret = scf_set_error(SCF_ERROR_NOT_FOUND);
        goto reset_args;
    }


    if (service == NULL || last == REP_PROTOCOL_ENTITY_SCOPE) {
        handle_rele_subhandles(h, holds);
        return (0);
    }

    if (scf_scope_get_service(sc, service, svc) == -1) {
        handle_rele_subhandles(h, holds);
        ret = -1;
        assert(scf_error() != SCF_ERROR_NOT_SET);
        if (scf_error() == SCF_ERROR_DELETED)
            (void) scf_set_error(SCF_ERROR_NOT_FOUND);
        goto reset_args;
    }

    if (last == REP_PROTOCOL_ENTITY_SERVICE) {
        handle_rele_subhandles(h, holds);
        return (0);
    }

    if (instance == NULL) {
        if (propertygroup == NULL ||
            last == REP_PROTOCOL_ENTITY_INSTANCE) {
            handle_rele_subhandles(h, holds);
            return (0);
        }

        if (scf_service_get_pg(svc, propertygroup, pg) == -1) {
            handle_rele_subhandles(h, holds);
            ret = -1;
            assert(scf_error() != SCF_ERROR_NOT_SET);
            if (scf_error() == SCF_ERROR_DELETED)
                (void) scf_set_error(SCF_ERROR_NOT_FOUND);
            goto reset_args;
        }
    } else {
        if (scf_service_get_instance(svc, instance, inst) == -1) {
            handle_rele_subhandles(h, holds);
            ret = -1;
            assert(scf_error() != SCF_ERROR_NOT_SET);
            if (scf_error() == SCF_ERROR_DELETED)
                (void) scf_set_error(SCF_ERROR_NOT_FOUND);
            goto reset_args;
        }

        if (propertygroup == NULL ||
            last == REP_PROTOCOL_ENTITY_INSTANCE) {
            handle_rele_subhandles(h, holds);
            return (0);
        }

        if (scf_instance_get_pg(inst, propertygroup, pg) == -1) {
            handle_rele_subhandles(h, holds);
            ret = -1;
            assert(scf_error() != SCF_ERROR_NOT_SET);
            if (scf_error() == SCF_ERROR_DELETED)
                (void) scf_set_error(SCF_ERROR_NOT_FOUND);
            goto reset_args;
        }
    }

    if (property == NULL || last == REP_PROTOCOL_ENTITY_PROPERTYGRP) {
        handle_rele_subhandles(h, holds);
        return (0);
    }

    if (scf_pg_get_property(pg, property, prop) == -1) {
        handle_rele_subhandles(h, holds);
        ret = -1;
        assert(scf_error() != SCF_ERROR_NOT_SET);
        if (scf_error() == SCF_ERROR_DELETED)
            (void) scf_set_error(SCF_ERROR_NOT_FOUND);
        goto reset_args;
    }

    handle_rele_subhandles(h, holds);
    return (0);

reset_args:
    if (sc != NULL)
        datael_reset(&sc->rd_d);
    if (svc != NULL)
        datael_reset(&svc->rd_d);
    if (inst != NULL)
        datael_reset(&inst->rd_d);
    if (pg != NULL)
        datael_reset(&pg->rd_d);
    if (prop != NULL)
        datael_reset(&prop->rd_d);

    return (ret);
}

/*
 * Fails with _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL (server response too
 * big, bad entity id, request not applicable to entity, name too long for
 * buffer), _NOT_SET, or _DELETED.
 */
ssize_t
scf_scope_to_fmri(const scf_scope_t *scope, char *out, size_t sz)
{
    ssize_t r, len;

    char tmp[REP_PROTOCOL_NAME_LEN];

    r = scf_scope_get_name(scope, tmp, sizeof (tmp));

    if (r <= 0)
        return (r);

    len = strlcpy(out, SCF_FMRI_SVC_PREFIX, sz);
    if (strcmp(tmp, SCF_FMRI_LOCAL_SCOPE) != 0) {
        if (len >= sz)
            return (len + r + sizeof (SCF_FMRI_SCOPE_SUFFIX) - 1);

        len = strlcat(out, tmp, sz);
        if (len >= sz)
            return (len + sizeof (SCF_FMRI_SCOPE_SUFFIX) - 1);
        len = strlcat(out,
            SCF_FMRI_SCOPE_SUFFIX SCF_FMRI_SERVICE_PREFIX, sz);
    }

    return (len);
}

/*
 * Fails with _NOT_BOUND, _CONNECTION_BROKEN, _INTERNAL (server response too
 * big, bad element id, bad ids, bad types, scope has no parent, request not
 * applicable to entity, name too long), _NOT_SET, _DELETED,
 */
ssize_t
scf_service_to_fmri(const scf_service_t *svc, char *out, size_t sz)
{
    scf_handle_t *h = svc->rd_d.rd_handle;
    scf_scope_t *scope = HANDLE_HOLD_SCOPE(h);
    ssize_t r, len;

    char tmp[REP_PROTOCOL_NAME_LEN];

    r = datael_get_parent(&svc->rd_d, &scope->rd_d);
    if (r != SCF_SUCCESS) {
        HANDLE_RELE_SCOPE(h);

        assert(scf_error() != SCF_ERROR_HANDLE_MISMATCH);
        return (-1);
    }
    if (out != NULL && sz > 0)
        len = scf_scope_to_fmri(scope, out, sz);
    else
        len = scf_scope_to_fmri(scope, tmp, 2);

    HANDLE_RELE_SCOPE(h);

    if (len < 0)
        return (-1);

    if (out == NULL || len >= sz)
        len += sizeof (SCF_FMRI_SERVICE_PREFIX) - 1;
    else
        len = strlcat(out, SCF_FMRI_SERVICE_PREFIX, sz);

    r = scf_service_get_name(svc, tmp, sizeof (tmp));
    if (r < 0)
        return (r);

    if (out == NULL || len >= sz)
        len += r;
    else
        len = strlcat(out, tmp, sz);

    return (len);
}

ssize_t
scf_instance_to_fmri(const scf_instance_t *inst, char *out, size_t sz)
{
    scf_handle_t *h = inst->rd_d.rd_handle;
    scf_service_t *svc = HANDLE_HOLD_SERVICE(h);
    ssize_t r, len;

    char tmp[REP_PROTOCOL_NAME_LEN];

    r = datael_get_parent(&inst->rd_d, &svc->rd_d);
    if (r != SCF_SUCCESS) {
        HANDLE_RELE_SERVICE(h);
        return (-1);
    }

    len = scf_service_to_fmri(svc, out, sz);

    HANDLE_RELE_SERVICE(h);

    if (len < 0)
        return (len);

    if (len >= sz)
        len += sizeof (SCF_FMRI_INSTANCE_PREFIX) - 1;
    else
        len = strlcat(out, SCF_FMRI_INSTANCE_PREFIX, sz);

    r = scf_instance_get_name(inst, tmp, sizeof (tmp));
    if (r < 0)
        return (r);

    if (len >= sz)
        len += r;
    else
        len = strlcat(out, tmp, sz);

    return (len);
}

ssize_t
scf_pg_to_fmri(const scf_propertygroup_t *pg, char *out, size_t sz)
{
    scf_handle_t *h = pg->rd_d.rd_handle;

    struct rep_protocol_entity_parent_type request;
    struct rep_protocol_integer_response response;

    char tmp[REP_PROTOCOL_NAME_LEN];
    ssize_t len, r;

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_ENTITY_PARENT_TYPE;
    request.rpr_entityid = pg->rd_d.rd_entity;

    datael_finish_reset(&pg->rd_d);
    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0)
        DOOR_ERRORS_BLOCK(r);

    if (response.rpr_response != REP_PROTOCOL_SUCCESS ||
        r < sizeof (response)) {
        return (scf_set_error(proto_error(response.rpr_response)));
    }

    switch (response.rpr_value) {
    case REP_PROTOCOL_ENTITY_SERVICE: {
        scf_service_t *svc;

        svc = HANDLE_HOLD_SERVICE(h);

        r = datael_get_parent(&pg->rd_d, &svc->rd_d);

        if (r == SCF_SUCCESS)
            len = scf_service_to_fmri(svc, out, sz);

        HANDLE_RELE_SERVICE(h);
        break;
    }

    case REP_PROTOCOL_ENTITY_INSTANCE: {
        scf_instance_t *inst;

        inst = HANDLE_HOLD_INSTANCE(h);

        r = datael_get_parent(&pg->rd_d, &inst->rd_d);

        if (r == SCF_SUCCESS)
            len = scf_instance_to_fmri(inst, out, sz);

        HANDLE_RELE_INSTANCE(h);
        break;
    }

    case REP_PROTOCOL_ENTITY_SNAPLEVEL: {
        scf_instance_t *inst = HANDLE_HOLD_INSTANCE(h);
        scf_snapshot_t *snap = HANDLE_HOLD_SNAPSHOT(h);
        scf_snaplevel_t *level = HANDLE_HOLD_SNAPLVL(h);

        r = datael_get_parent(&pg->rd_d, &level->rd_d);

        if (r == SCF_SUCCESS)
            r = datael_get_parent(&level->rd_d, &snap->rd_d);

        if (r == SCF_SUCCESS)
            r = datael_get_parent(&snap->rd_d, &inst->rd_d);

        if (r == SCF_SUCCESS)
            len = scf_instance_to_fmri(inst, out, sz);

        HANDLE_RELE_INSTANCE(h);
        HANDLE_RELE_SNAPSHOT(h);
        HANDLE_RELE_SNAPLVL(h);
        break;
    }

    default:
        return (scf_set_error(SCF_ERROR_INTERNAL));
    }

    if (r != SCF_SUCCESS)
        return (r);

    if (len >= sz)
        len += sizeof (SCF_FMRI_PROPERTYGRP_PREFIX) - 1;
    else
        len = strlcat(out, SCF_FMRI_PROPERTYGRP_PREFIX, sz);

    r = scf_pg_get_name(pg, tmp, sizeof (tmp));

    if (r < 0)
        return (r);

    if (len >= sz)
        len += r;
    else
        len = strlcat(out, tmp, sz);

    return (len);
}

ssize_t
scf_property_to_fmri(const scf_property_t *prop, char *out, size_t sz)
{
    scf_handle_t *h = prop->rd_d.rd_handle;
    scf_propertygroup_t *pg = HANDLE_HOLD_PG(h);

    char tmp[REP_PROTOCOL_NAME_LEN];
    ssize_t len;
    int r;

    r = datael_get_parent(&prop->rd_d, &pg->rd_d);
    if (r != SCF_SUCCESS) {
        HANDLE_RELE_PG(h);
        return (-1);
    }

    len = scf_pg_to_fmri(pg, out, sz);

    HANDLE_RELE_PG(h);

    if (len >= sz)
        len += sizeof (SCF_FMRI_PROPERTY_PREFIX) - 1;
    else
        len = strlcat(out, SCF_FMRI_PROPERTY_PREFIX, sz);

    r = scf_property_get_name(prop, tmp, sizeof (tmp));

    if (r < 0)
        return (r);

    if (len >= sz)
        len += r;
    else
        len = strlcat(out, tmp, sz);

    return (len);
}

int
scf_pg_get_underlying_pg(const scf_propertygroup_t *pg,
    scf_propertygroup_t *out)
{
    scf_handle_t *h = pg->rd_d.rd_handle;
    scf_service_t *svc;
    scf_instance_t *inst;

    char me[REP_PROTOCOL_NAME_LEN];
    int r;

    if (h != out->rd_d.rd_handle)
        return (scf_set_error(SCF_ERROR_HANDLE_MISMATCH));

    r = scf_pg_get_name(pg, me, sizeof (me));

    if (r < 0)
        return (r);

    svc = HANDLE_HOLD_SERVICE(h);
    inst = HANDLE_HOLD_INSTANCE(h);

    r = datael_get_parent(&pg->rd_d, &inst->rd_d);

    if (r == SCF_SUCCESS) {
        r = datael_get_parent(&inst->rd_d, &svc->rd_d);
        if (r != SCF_SUCCESS) {
            goto out;
        }
        r = scf_service_get_pg(svc, me, out);
    } else {
        r = scf_set_error(SCF_ERROR_NOT_FOUND);
    }

out:
    HANDLE_RELE_SERVICE(h);
    HANDLE_RELE_INSTANCE(h);
    return (r);
}

#define LEGACY_SCHEME   "lrc:"
#define LEGACY_UNKNOWN  "unknown"

/*
 * Implementation of scf_walk_fmri()
 *
 * This is a little tricky due to the many-to-many relationship between patterns
 * and matches.  We need to be able to satisfy the following requirements:
 *
 *  1) Detect patterns which match more than one FMRI, and be able to
 *         report which FMRIs have been matched.
 *  2) Detect patterns which have not matched any FMRIs
 *  3) Visit each matching FMRI exactly once across all patterns
 *  4) Ignore FMRIs which have only been matched due to multiply-matching
 *         patterns.
 *
 * We maintain an array of scf_pattern_t structures, one for each argument, and
 * maintain a linked list of scf_match_t structures for each one.  We first
 * qualify each pattern's type:
 *
 *  PATTERN_INVALID     The argument is invalid (too long).
 *
 *  PATTERN_EXACT       The pattern is a complete FMRI.  The list of
 *              matches contains only a single entry.
 *
 *  PATTERN_GLOB        The pattern will be matched against all
 *              FMRIs via fnmatch() in the second phase.
 *              Matches will be added to the pattern's list
 *              as they are found.
 *
 *  PATTERN_PARTIAL     Everything else.  We will assume that this is
 *              an abbreviated FMRI, and match according to
 *              our abbreviated FMRI rules.  Matches will be
 *              added to the pattern's list as they are found.
 *
 * The first pass searches for arguments that are complete FMRIs.  These are
 * classified as EXACT patterns and do not necessitate searching the entire
 * tree.
 *
 * Once this is done, if we have any GLOB or PARTIAL patterns (or if no
 * arguments were given), we iterate over all services and instances in the
 * repository, looking for matches.
 *
 * When a match is found, we add the match to the pattern's list.  We also enter
 * the match into a hash table, resulting in something like this:
 *
 *       scf_pattern_t       scf_match_t
 *     +---------------+      +-------+     +-------+
 *     | pattern 'foo' |----->| match |---->| match |
 *     +---------------+      +-------+     +-------+
 *                                |             |
 *           scf_match_key_t      |             |
 *           +--------------+     |             |
 *           | FMRI bar/foo |<----+             |
 *           +--------------+                   |
 *           | FMRI baz/foo |<------------------+
 *           +--------------+
 *
 * Once we have all of this set up, we do one pass to report patterns matching
 * multiple FMRIs (if SCF_WALK_MULTIPLE is not set) and patterns for which no
 * match was found.
 *
 * Finally, we walk through all valid patterns, and for each match, if we
 * haven't already seen the match (as recorded in the hash table), then we
 * execute the callback.
 */

struct scf_matchkey;
struct scf_match;

/*
 * scf_matchkey_t
 */
typedef struct scf_matchkey {
    char            *sk_fmri;   /* Matching FMRI */
    char            *sk_legacy; /* Legacy name */
    int         sk_seen;    /* If we've been seen */
    struct scf_matchkey *sk_next;   /* Next in hash chain */
} scf_matchkey_t;

/*
 * scf_match_t
 */
typedef struct scf_match {
    scf_matchkey_t      *sm_key;
    struct scf_match    *sm_next;
} scf_match_t;

#define WALK_HTABLE_SIZE    123

/*
 * scf_get_key()
 *
 * Given an FMRI and a hash table, returns the scf_matchkey_t corresponding to
 * this FMRI.  If the FMRI does not exist, it is added to the hash table.  If a
 * new entry cannot be allocated due to lack of memory, NULL is returned.
 */
static scf_matchkey_t *
scf_get_key(scf_matchkey_t **htable, const char *fmri, const char *legacy)
{
    uint_t h = 0, g;
    const char *p, *k;
    scf_matchkey_t *key;

    k = strstr(fmri, ":/");
    assert(k != NULL);
    k += 2;

    /*
     * Generic hash function from uts/common/os/modhash.c.
     */
    for (p = k; *p != '\0'; ++p) {
        h = (h << 4) + *p;
        if ((g = (h & 0xf0000000)) != 0) {
            h ^= (g >> 24);
            h ^= g;
        }
    }

    h %= WALK_HTABLE_SIZE;

    /*
     * Search for an existing key
     */
    for (key = htable[h]; key != NULL; key = key->sk_next) {
        if (strcmp(key->sk_fmri, fmri) == 0)
            return (key);
    }

    if ((key = calloc(sizeof (scf_matchkey_t), 1)) == NULL)
        return (NULL);

    /*
     * Add new key to hash table.
     */
    if ((key->sk_fmri = strdup(fmri)) == NULL) {
        free(key);
        return (NULL);
    }

    if (legacy == NULL) {
        key->sk_legacy = NULL;
    } else if ((key->sk_legacy = strdup(legacy)) == NULL) {
        free(key->sk_fmri);
        free(key);
        return (NULL);
    }

    key->sk_next = htable[h];
    htable[h] = key;

    return (key);
}

/*
 * Given an FMRI, insert it into the pattern's list appropriately.
 * svc_explicit indicates whether matching services should take
 * precedence over matching instances.
 */
static scf_error_t
scf_add_match(scf_matchkey_t **htable, const char *fmri, const char *legacy,
    scf_pattern_t *pattern, int svc_explicit)
{
    scf_match_t *match;

    /*
     * If svc_explicit is set, enforce the constaint that matching
     * instances take precedence over matching services. Otherwise,
     * matching services take precedence over matching instances.
     */
    if (svc_explicit) {
        scf_match_t *next, *prev;
        /*
         * If we match an instance, check to see if we must remove
         * any matching services (for SCF_WALK_EXPLICIT).
         */
        for (prev = match = pattern->sp_matches; match != NULL;
            match = next) {
            size_t len = strlen(match->sm_key->sk_fmri);
            next = match->sm_next;
            if (strncmp(match->sm_key->sk_fmri, fmri, len) == 0 &&
                fmri[len] == ':') {
                if (prev == match)
                    pattern->sp_matches = match->sm_next;
                else
                    prev->sm_next = match->sm_next;
                pattern->sp_matchcount--;
                free(match);
            } else
                prev = match;
        }
    } else {
        /*
         * If we've matched a service don't add any instances (for
         * SCF_WALK_SERVICE).
         */
        for (match = pattern->sp_matches; match != NULL;
            match = match->sm_next) {
            size_t len = strlen(match->sm_key->sk_fmri);
            if (strncmp(match->sm_key->sk_fmri, fmri, len) == 0 &&
                fmri[len] == ':')
                return (0);
        }
    }

    if ((match = malloc(sizeof (scf_match_t))) == NULL)
        return (SCF_ERROR_NO_MEMORY);

    if ((match->sm_key = scf_get_key(htable, fmri, legacy)) == NULL) {
        free(match);
        return (SCF_ERROR_NO_MEMORY);
    }

    match->sm_next = pattern->sp_matches;
    pattern->sp_matches = match;
    pattern->sp_matchcount++;

    return (0);
}

/*
 * Returns 1 if the fmri matches the given pattern, 0 otherwise.
 */
int
scf_cmp_pattern(char *fmri, scf_pattern_t *pattern)
{
    char *tmp;

    if (pattern->sp_type == PATTERN_GLOB) {
        if (fnmatch(pattern->sp_arg, fmri, 0) == 0)
            return (1);
    } else if (pattern->sp_type == PATTERN_PARTIAL &&
        (tmp = strstr(fmri, pattern->sp_arg)) != NULL) {
        /*
         * We only allow partial matches anchored on the end of
         * a service or instance, and beginning on an element
         * boundary.
         */
        if (tmp != fmri && tmp[-1] != '/' && tmp[-1] != ':' &&
            tmp[0] != ':')
            return (0);
        tmp += strlen(pattern->sp_arg);
        if (tmp != fmri + strlen(fmri) && tmp[0] != ':' &&
            tmp[-1] != ':')
            return (0);

        /*
         * If the user has supplied a short pattern that matches
         * 'svc:/' or 'lrc:/', ignore it.
         */
        if (tmp <= fmri + 4)
            return (0);

        return (1);
    }

    return (0);
}

/*
 * Attempts to match the given FMRI against a set of patterns, keeping track of
 * the results.
 */
static scf_error_t
scf_pattern_match(scf_matchkey_t **htable, char *fmri, const char *legacy,
    int npattern, scf_pattern_t *pattern, int svc_explicit)
{
    int i;
    int ret = 0;

    for (i = 0; i < npattern; i++) {
        if (scf_cmp_pattern(fmri, &pattern[i]) &&
            (ret = scf_add_match(htable, fmri,
            legacy, &pattern[i], svc_explicit)) != 0)
            return (ret);
    }

    return (0);
}

scf_error_t
scf_walk_fmri(scf_handle_t *h, int argc, char **argv, int flags,
    scf_walk_callback callback, void *data, int *err,
    void (*errfunc)(const char *, ...))
{
    scf_pattern_t *pattern = NULL;
    int i;
    char *fmri = NULL;
    ssize_t max_fmri_length;
    scf_service_t *svc = NULL;
    scf_instance_t *inst = NULL;
    scf_iter_t *iter = NULL, *sciter = NULL, *siter = NULL;
    scf_scope_t *scope = NULL;
    scf_propertygroup_t *pg = NULL;
    scf_property_t *prop = NULL;
    scf_value_t *value = NULL;
    int ret = 0;
    scf_matchkey_t **htable = NULL;
    int pattern_search = 0;
    ssize_t max_name_length;
    char *pgname = NULL;
    scf_walkinfo_t info;

#ifndef NDEBUG
    if (flags & SCF_WALK_EXPLICIT)
        assert(flags & SCF_WALK_SERVICE);
    if (flags & SCF_WALK_NOINSTANCE)
        assert(flags & SCF_WALK_SERVICE);
    if (flags & SCF_WALK_PROPERTY)
        assert(!(flags & SCF_WALK_LEGACY));
#endif

    /*
     * Setup initial variables
     */
    if ((max_fmri_length = scf_limit(SCF_LIMIT_MAX_FMRI_LENGTH)) == -1 ||
        (max_name_length = scf_limit(SCF_LIMIT_MAX_NAME_LENGTH)) == -1)
        return (SCF_ERROR_INTERNAL);

    if ((fmri = malloc(max_fmri_length + 1)) == NULL ||
        (pgname = malloc(max_name_length + 1)) == NULL) {
        ret = SCF_ERROR_NO_MEMORY;
        goto error;
    }

    if (argc == 0) {
        pattern = NULL;
    } else if ((pattern = calloc(argc, sizeof (scf_pattern_t)))
        == NULL) {
        ret = SCF_ERROR_NO_MEMORY;
        goto error;
    }

    if ((htable = calloc(WALK_HTABLE_SIZE, sizeof (void *))) == NULL) {
        ret = SCF_ERROR_NO_MEMORY;
        goto error;
    }

    if ((inst = scf_instance_create(h)) == NULL ||
        (svc = scf_service_create(h)) == NULL ||
        (iter = scf_iter_create(h)) == NULL ||
        (sciter = scf_iter_create(h)) == NULL ||
        (siter = scf_iter_create(h)) == NULL ||
        (scope = scf_scope_create(h)) == NULL ||
        (pg = scf_pg_create(h)) == NULL ||
        (prop = scf_property_create(h)) == NULL ||
        (value = scf_value_create(h)) == NULL) {
        ret = scf_error();
        goto error;
    }

    /*
     * For each fmri given, we first check to see if it's a full service,
     * instance, property group, or property FMRI.  This avoids having to do
     * the (rather expensive) walk of all instances.  Any element which does
     * not match a full fmri is identified as a globbed pattern or a partial
     * fmri and stored in a private array when walking instances.
     */
    for (i = 0; i < argc; i++) {
        const char *scope_name, *svc_name, *inst_name, *pg_name;
        const char *prop_name;

        if (strlen(argv[i]) > max_fmri_length) {
            errfunc(scf_get_msg(SCF_MSG_ARGTOOLONG), argv[i]);
            if (err != NULL)
                *err = UU_EXIT_FATAL;
            continue;
        }

        (void) strcpy(fmri, argv[i]);
        if (scf_parse_svc_fmri(fmri, &scope_name, &svc_name, &inst_name,
            &pg_name, &prop_name) != SCF_SUCCESS)
            goto badfmri;

        /*
         * If the user has specified SCF_WALK_PROPERTY, allow property
         * groups and properties.
         */
        if (pg_name != NULL || prop_name != NULL) {
            if (!(flags & SCF_WALK_PROPERTY))
                goto badfmri;

            if (scf_handle_decode_fmri(h, argv[i], NULL, NULL,
                NULL, pg, prop, 0) != 0)
                goto badfmri;

            if (scf_pg_get_name(pg, NULL, 0) < 0 &&
                scf_property_get_name(prop, NULL, 0) < 0)
                goto badfmri;

            if (scf_canonify_fmri(argv[i], fmri, max_fmri_length)
                <= 0) {
                /*
                 * scf_parse_fmri() should have caught this.
                 */
                abort();
            }

            if ((ret = scf_add_match(htable, fmri, NULL,
                &pattern[i], flags & SCF_WALK_EXPLICIT)) != 0)
                goto error;

            if ((pattern[i].sp_arg = strdup(argv[i])) == NULL) {
                ret = SCF_ERROR_NO_MEMORY;
                goto error;
            }
            pattern[i].sp_type = PATTERN_EXACT;
        }

        /*
         * We need at least a service name
         */
        if (scope_name == NULL || svc_name == NULL)
            goto badfmri;

        /*
         * If we have a fully qualified instance, add it to our list of
         * fmris to watch.
         */
        if (inst_name != NULL) {
            if (flags & SCF_WALK_NOINSTANCE)
                goto badfmri;

            if (scf_handle_decode_fmri(h, argv[i], NULL, NULL,
                inst, NULL, NULL, SCF_DECODE_FMRI_EXACT) != 0)
                goto badfmri;

            if (scf_canonify_fmri(argv[i], fmri, max_fmri_length)
                <= 0)
                goto badfmri;

            if ((ret = scf_add_match(htable, fmri, NULL,
                &pattern[i], flags & SCF_WALK_EXPLICIT)) != 0)
                goto error;

            if ((pattern[i].sp_arg = strdup(argv[i])) == NULL) {
                ret = SCF_ERROR_NO_MEMORY;
                goto error;
            }
            pattern[i].sp_type = PATTERN_EXACT;

            continue;
        }

        if (scf_handle_decode_fmri(h, argv[i], NULL, svc,
            NULL, NULL, NULL, SCF_DECODE_FMRI_EXACT) !=
            SCF_SUCCESS)
            goto badfmri;

        /*
         * If the user allows for bare services, then simply
         * pass this service on.
         */
        if (flags & SCF_WALK_SERVICE) {
            if (scf_service_to_fmri(svc, fmri,
                max_fmri_length + 1) <= 0) {
                ret = scf_error();
                goto error;
            }

            if ((ret = scf_add_match(htable, fmri, NULL,
                &pattern[i], flags & SCF_WALK_EXPLICIT)) != 0)
                goto error;

            if ((pattern[i].sp_arg = strdup(argv[i]))
                == NULL) {
                ret = SCF_ERROR_NO_MEMORY;
                goto error;
            }
            pattern[i].sp_type = PATTERN_EXACT;
            continue;
        }

        if (flags & SCF_WALK_NOINSTANCE)
            goto badfmri;

        /*
         * Otherwise, iterate over all instances in the service.
         */
        if (scf_iter_service_instances(iter, svc) !=
            SCF_SUCCESS) {
            ret = scf_error();
            goto error;
        }

        for (;;) {
            ret = scf_iter_next_instance(iter, inst);
            if (ret == 0)
                break;
            if (ret != 1) {
                ret = scf_error();
                goto error;
            }

            if (scf_instance_to_fmri(inst, fmri,
                max_fmri_length + 1) == -1)
                goto badfmri;

            if ((ret = scf_add_match(htable, fmri, NULL,
                &pattern[i], flags & SCF_WALK_EXPLICIT)) != 0)
                goto error;
        }

        if ((pattern[i].sp_arg = strdup(argv[i])) == NULL) {
            ret = SCF_ERROR_NO_MEMORY;
            goto error;
        }
        pattern[i].sp_type = PATTERN_EXACT;

        continue;

badfmri:

        /*
         * If we got here because of a fatal error, bail out
         * immediately.
         */
        if (scf_error() == SCF_ERROR_CONNECTION_BROKEN) {
            ret = scf_error();
            goto error;
        }

        /*
         * At this point we failed to interpret the argument as a
         * complete fmri, so mark it as a partial or globbed FMRI for
         * later processing.
         */
        if (strpbrk(argv[i], "*?[") != NULL) {
            /*
             * Prepend svc:/ to patterns which don't begin with * or
             * svc: or lrc:.
             */
            pattern[i].sp_type = PATTERN_GLOB;
            if (argv[i][0] == '*' ||
                (strlen(argv[i]) >= 4 && argv[i][3] == ':'))
                pattern[i].sp_arg = strdup(argv[i]);
            else {
                pattern[i].sp_arg = malloc(strlen(argv[i]) + 6);
                if (pattern[i].sp_arg != NULL)
                    (void) snprintf(pattern[i].sp_arg,
                        strlen(argv[i]) + 6, "svc:/%s",
                        argv[i]);
            }
        } else {
            pattern[i].sp_type = PATTERN_PARTIAL;
            pattern[i].sp_arg = strdup(argv[i]);
        }
        pattern_search = 1;
        if (pattern[i].sp_arg == NULL) {
            ret = SCF_ERROR_NO_MEMORY;
            goto error;
        }
    }

    if (pattern_search || argc == 0) {
        /*
         * We have a set of patterns to search for.  Iterate over all
         * instances and legacy services searching for matches.
         */
        if (scf_handle_get_local_scope(h, scope) != 0) {
            ret = scf_error();
            goto error;
        }

        if (scf_iter_scope_services(sciter, scope) != 0) {
            ret = scf_error();
            goto error;
        }

        for (;;) {
            ret = scf_iter_next_service(sciter, svc);
            if (ret == 0)
                break;
            if (ret != 1) {
                ret = scf_error();
                goto error;
            }

            if (flags & SCF_WALK_SERVICE) {
                /*
                 * If the user is requesting bare services, try
                 * to match the service first.
                 */
                if (scf_service_to_fmri(svc, fmri,
                    max_fmri_length + 1) < 0) {
                    ret = scf_error();
                    goto error;
                }

                if (argc == 0) {
                    info.fmri = fmri;
                    info.scope = scope;
                    info.svc = svc;
                    info.inst = NULL;
                    info.pg = NULL;
                    info.prop = NULL;
                    if ((ret = callback(data, &info)) != 0)
                        goto error;
                    continue;
                } else if ((ret = scf_pattern_match(htable,
                    fmri, NULL, argc, pattern,
                    flags & SCF_WALK_EXPLICIT)) != 0) {
                    goto error;
                }
            }

            if (flags & SCF_WALK_NOINSTANCE)
                continue;

            /*
             * Iterate over all instances in the service.
             */
            if (scf_iter_service_instances(siter, svc) != 0) {
                if (scf_error() != SCF_ERROR_DELETED) {
                    ret = scf_error();
                    goto error;
                }
                continue;
            }

            for (;;) {
                ret = scf_iter_next_instance(siter, inst);
                if (ret == 0)
                    break;
                if (ret != 1) {
                    if (scf_error() != SCF_ERROR_DELETED) {
                        ret = scf_error();
                        goto error;
                    }
                    break;
                }

                if (scf_instance_to_fmri(inst, fmri,
                    max_fmri_length + 1) < 0) {
                    ret = scf_error();
                    goto error;
                }

                /*
                 * Without arguments, execute the callback
                 * immediately.
                 */
                if (argc == 0) {
                    info.fmri = fmri;
                    info.scope = scope;
                    info.svc = svc;
                    info.inst = inst;
                    info.pg = NULL;
                    info.prop = NULL;
                    if ((ret = callback(data, &info)) != 0)
                        goto error;
                } else if ((ret = scf_pattern_match(htable,
                    fmri, NULL, argc, pattern,
                    flags & SCF_WALK_EXPLICIT)) != 0) {
                    goto error;
                }
            }
        }

        /*
         * Search legacy services
         */
        if ((flags & SCF_WALK_LEGACY)) {
            if (scf_scope_get_service(scope, SCF_LEGACY_SERVICE,
                svc) != 0) {
                if (scf_error() != SCF_ERROR_NOT_FOUND) {
                    ret = scf_error();
                    goto error;
                }

                goto nolegacy;
            }

            if (scf_iter_service_pgs_typed(iter, svc,
                SCF_GROUP_FRAMEWORK) != SCF_SUCCESS) {
                ret = scf_error();
                goto error;
            }

            (void) strcpy(fmri, LEGACY_SCHEME);

            for (;;) {
                ret = scf_iter_next_pg(iter, pg);
                if (ret == -1) {
                    ret = scf_error();
                    goto error;
                }
                if (ret == 0)
                    break;

                if (scf_pg_get_property(pg,
                    SCF_LEGACY_PROPERTY_NAME, prop) == -1) {
                    ret = scf_error();
                    if (ret == SCF_ERROR_DELETED ||
                        ret == SCF_ERROR_NOT_FOUND) {
                        ret = 0;
                        continue;
                    }
                    goto error;
                }

                if (scf_property_is_type(prop, SCF_TYPE_ASTRING)
                    != SCF_SUCCESS) {
                    if (scf_error() == SCF_ERROR_DELETED)
                        continue;
                    ret = scf_error();
                    goto error;
                }

                if (scf_property_get_value(prop, value) !=
                    SCF_SUCCESS)
                    continue;

                if (scf_value_get_astring(value,
                    fmri + sizeof (LEGACY_SCHEME) - 1,
                    max_fmri_length + 2 -
                    sizeof (LEGACY_SCHEME)) <= 0)
                    continue;

                if (scf_pg_get_name(pg, pgname,
                    max_name_length + 1) <= 0) {
                    if (scf_error() == SCF_ERROR_DELETED)
                        continue;
                    ret = scf_error();
                    goto error;
                }

                if (argc == 0) {
                    info.fmri = fmri;
                    info.scope = scope;
                    info.svc = NULL;
                    info.inst = NULL;
                    info.pg = pg;
                    info.prop = NULL;
                    if ((ret = callback(data, &info)) != 0)
                        goto error;
                } else if ((ret = scf_pattern_match(htable,
                    fmri, pgname, argc, pattern,
                    flags & SCF_WALK_EXPLICIT)) != 0)
                    goto error;
            }

        }
    }
nolegacy:
    ret = 0;

    if (argc == 0)
        goto error;

    /*
     * Check all patterns, and see if we have that any that didn't match
     * or any that matched multiple instances.  For svcprop, add up the
     * total number of matching keys.
     */
    info.count = 0;
    for (i = 0; i < argc; i++) {
        scf_match_t *match;

        if (pattern[i].sp_type == PATTERN_INVALID)
            continue;
        if (pattern[i].sp_matchcount == 0) {
            scf_msg_t msgid;
            /*
             * Provide a useful error message based on the argument
             * and the type of entity requested.
             */
            if (!(flags & SCF_WALK_LEGACY) &&
                strncmp(pattern[i].sp_arg, "lrc:/", 5) == 0)
                msgid = SCF_MSG_PATTERN_LEGACY;
            else if (flags & SCF_WALK_PROPERTY)
                msgid = SCF_MSG_PATTERN_NOENTITY;
            else if (flags & SCF_WALK_NOINSTANCE)
                msgid = SCF_MSG_PATTERN_NOSERVICE;
            else if (flags & SCF_WALK_SERVICE)
                msgid = SCF_MSG_PATTERN_NOINSTSVC;
            else
                msgid = SCF_MSG_PATTERN_NOINSTANCE;

            errfunc(scf_get_msg(msgid), pattern[i].sp_arg);
            if (err)
                *err = UU_EXIT_FATAL;
        } else if (!(flags & SCF_WALK_MULTIPLE) &&
            pattern[i].sp_matchcount > 1) {
            size_t len, off;
            char *msg;

            /*
             * Construct a message with all possible FMRIs before
             * passing off to error handling function.
             *
             * Note that strlen(scf_get_msg(...)) includes the
             * length of '%s', which accounts for the terminating
             * null byte.
             */
            len = strlen(scf_get_msg(SCF_MSG_PATTERN_MULTIMATCH)) +
                strlen(pattern[i].sp_arg);
            for (match = pattern[i].sp_matches; match != NULL;
                match = match->sm_next) {
                len += strlen(match->sm_key->sk_fmri) + 2;
            }
            if ((msg = malloc(len)) == NULL) {
                ret = SCF_ERROR_NO_MEMORY;
                goto error;
            }

            /* LINTED - format argument */
            (void) snprintf(msg, len,
                scf_get_msg(SCF_MSG_PATTERN_MULTIMATCH),
                pattern[i].sp_arg);
            off = strlen(msg);
            for (match = pattern[i].sp_matches; match != NULL;
                match = match->sm_next) {
                off += snprintf(msg + off, len - off, "\t%s\n",
                    match->sm_key->sk_fmri);
            }

            errfunc(msg);
            if (err != NULL)
                *err = UU_EXIT_FATAL;

            free(msg);
        } else {
            for (match = pattern[i].sp_matches; match != NULL;
                match = match->sm_next) {
                if (!match->sm_key->sk_seen)
                    info.count++;
                match->sm_key->sk_seen = 1;
            }
        }
    }

    /*
     * Clear 'sk_seen' for all keys.
     */
    for (i = 0; i < WALK_HTABLE_SIZE; i++) {
        scf_matchkey_t *key;
        for (key = htable[i]; key != NULL; key = key->sk_next)
            key->sk_seen = 0;
    }

    /*
     * Iterate over all the FMRIs in our hash table and execute the
     * callback.
     */
    for (i = 0; i < argc; i++) {
        scf_match_t *match;
        scf_matchkey_t *key;

        /*
         * Ignore patterns which didn't match anything or matched too
         * many FMRIs.
         */
        if (pattern[i].sp_matchcount == 0 ||
            (!(flags & SCF_WALK_MULTIPLE) &&
            pattern[i].sp_matchcount > 1))
            continue;

        for (match = pattern[i].sp_matches; match != NULL;
            match = match->sm_next) {

            key = match->sm_key;
            if (key->sk_seen)
                continue;

            key->sk_seen = 1;

            if (key->sk_legacy != NULL) {
                if (scf_scope_get_service(scope,
                    "smf/legacy_run", svc) != 0) {
                    ret = scf_error();
                    goto error;
                }

                if (scf_service_get_pg(svc, key->sk_legacy,
                    pg) != 0)
                    continue;

                info.fmri = key->sk_fmri;
                info.scope = scope;
                info.svc = NULL;
                info.inst = NULL;
                info.pg = pg;
                info.prop = NULL;
                if ((ret = callback(data, &info)) != 0)
                    goto error;
            } else {
                if (scf_handle_decode_fmri(h, key->sk_fmri,
                    scope, svc, inst, pg, prop, 0) !=
                    SCF_SUCCESS)
                    continue;

                info.fmri = key->sk_fmri;
                info.scope = scope;
                info.svc = svc;
                if (scf_instance_get_name(inst, NULL, 0) < 0) {
                    if (scf_error() ==
                        SCF_ERROR_CONNECTION_BROKEN) {
                        ret = scf_error();
                        goto error;
                    }
                    info.inst = NULL;
                } else {
                    info.inst = inst;
                }
                if (scf_pg_get_name(pg, NULL, 0) < 0) {
                    if (scf_error() ==
                        SCF_ERROR_CONNECTION_BROKEN) {
                        ret = scf_error();
                        goto error;
                    }
                    info.pg = NULL;
                } else {
                    info.pg = pg;
                }
                if (scf_property_get_name(prop, NULL, 0) < 0) {
                    if (scf_error() ==
                        SCF_ERROR_CONNECTION_BROKEN) {
                        ret = scf_error();
                        goto error;
                    }
                    info.prop = NULL;
                } else {
                    info.prop = prop;
                }

                if ((ret = callback(data, &info)) != 0)
                    goto error;
            }
        }
    }

error:
    if (htable) {
        scf_matchkey_t *key, *next;

        for (i = 0; i < WALK_HTABLE_SIZE; i++) {

            for (key = htable[i]; key != NULL;
                key = next) {

                next = key->sk_next;

                if (key->sk_fmri != NULL)
                    free(key->sk_fmri);
                if (key->sk_legacy != NULL)
                    free(key->sk_legacy);
                free(key);
            }
        }
        free(htable);
    }
    if (pattern != NULL) {
        for (i = 0; i < argc; i++) {
            scf_match_t *match, *next;

            if (pattern[i].sp_arg != NULL)
                free(pattern[i].sp_arg);

            for (match = pattern[i].sp_matches; match != NULL;
                match = next) {

                next = match->sm_next;

                free(match);
            }
        }
        free(pattern);
    }

    free(fmri);
    free(pgname);

    scf_value_destroy(value);
    scf_property_destroy(prop);
    scf_pg_destroy(pg);
    scf_scope_destroy(scope);
    scf_iter_destroy(siter);
    scf_iter_destroy(sciter);
    scf_iter_destroy(iter);
    scf_instance_destroy(inst);
    scf_service_destroy(svc);

    return (ret);
}

/*
 * _scf_request_backup:  a simple wrapper routine
 */
int
_scf_request_backup(scf_handle_t *h, const char *name)
{
    struct rep_protocol_backup_request request;
    struct rep_protocol_response response;

    int r;

    if (strlcpy(request.rpr_name, name, sizeof (request.rpr_name)) >=
        sizeof (request.rpr_name))
        return (scf_set_error(SCF_ERROR_INVALID_ARGUMENT));

    (void) pthread_mutex_lock(&h->rh_lock);
    request.rpr_request = REP_PROTOCOL_BACKUP;
    request.rpr_changeid = handle_next_changeid(h);

    r = make_door_call(h, &request, sizeof (request),
        &response, sizeof (response));
    (void) pthread_mutex_unlock(&h->rh_lock);

    if (r < 0) {
        DOOR_ERRORS_BLOCK(r);
    }

    if (response.rpr_response != REP_PROTOCOL_SUCCESS)
        return (scf_set_error(proto_error(response.rpr_response)));
    return (SCF_SUCCESS);
}