libndr/common/ndr_svc.c

/*
 * 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 (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 */

#include <uuid/uuid.h>
#include <ctype.h>
#include <synch.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <assert.h>

#include <smbsrv/libsmb.h>
#include <smbsrv/libndr.h>


/*
 * Global list of allocated handles.  Handles are used in various
 * server-side RPC functions: typically, issued when a service is
 * opened and obsoleted when it is closed.  Clients should treat
 * handles as opaque data.
 */
static ndr_handle_t *ndr_handle_list;
static mutex_t ndr_handle_lock;

/*
 * Table of registered services.
 */
#define NDR_MAX_SERVICES    32
static ndr_service_t *ndr_services[NDR_MAX_SERVICES];

/*
 * Register a service.
 *
 * Returns:
 *  0   Success
 *  -1  Duplicate service
 *  -2  Duplicate name
 *  -3  Table overflow
 */
int
ndr_svc_register(ndr_service_t *svc)
{
    ndr_service_t   *p;
    int     free_slot = -1;
    int     i;

    for (i = 0; i < NDR_MAX_SERVICES; i++) {
        if ((p = ndr_services[i]) == NULL) {
            if (free_slot < 0)
                free_slot = i;
            continue;
        }

        if (p == svc)
            return (-1);

        if (strcasecmp(p->name, svc->name) == 0)
            return (-2);
    }

    if (free_slot < 0)
        return (-3);

    ndr_services[free_slot] = svc;
    return (0);
}

void
ndr_svc_unregister(ndr_service_t *svc)
{
    int i;

    for (i = 0; i < NDR_MAX_SERVICES; i++) {
        if (ndr_services[i] == svc)
            ndr_services[i] = NULL;
    }
}

ndr_stub_table_t *
ndr_svc_find_stub(ndr_service_t *svc, int opnum)
{
    ndr_stub_table_t *ste;

    for (ste = svc->stub_table; ste->func; ste++) {
        if (ste->opnum == opnum)
            return (ste);
    }

    return (NULL);
}

ndr_service_t *
ndr_svc_lookup_name(const char *name)
{
    ndr_service_t   *svc;
    int         i;

    for (i = 0; i < NDR_MAX_SERVICES; i++) {
        if ((svc = ndr_services[i]) == NULL)
            continue;

        if (strcasecmp(name, svc->name) != 0)
            continue;

        ndo_printf(0, 0, "%s %s", svc->name, svc->desc);
        return (svc);
    }

    return (NULL);
}

ndr_service_t *
ndr_svc_lookup_uuid(ndr_uuid_t *as_uuid, int as_vers,
    ndr_uuid_t *ts_uuid, int ts_vers)
{
    ndr_service_t *svc;
    char abstract_syntax[UUID_PRINTABLE_STRING_LENGTH];
    char transfer_syntax[UUID_PRINTABLE_STRING_LENGTH];
    int i;

    if (as_uuid)
        ndr_uuid_unparse(as_uuid, abstract_syntax);

    if (ts_uuid)
        ndr_uuid_unparse(ts_uuid, transfer_syntax);

    for (i = 0; i < NDR_MAX_SERVICES; i++) {
        if ((svc = ndr_services[i]) == NULL)
            continue;

        if (as_uuid) {
            if (svc->abstract_syntax_uuid == 0)
                continue;

            if (svc->abstract_syntax_version != as_vers)
                continue;

            if (strcasecmp(abstract_syntax,
                svc->abstract_syntax_uuid))
                continue;
        }

        if (ts_uuid) {
            if (svc->transfer_syntax_uuid == 0)
                continue;

            if (svc->transfer_syntax_version != ts_vers)
                continue;

            if (strcasecmp(transfer_syntax,
                svc->transfer_syntax_uuid))
                continue;
        }

        ndo_printf(0, 0, "%s %s", svc->name, svc->desc);
        return (svc);
    }

    ndo_printf(0, 0, "ndr_svc_lookup_uuid: unknown service");
    ndo_printf(0, 0, "abstract=%s v%d, transfer=%s v%d",
        abstract_syntax, as_vers, transfer_syntax, ts_vers);
    return (NULL);
}

/*
 * Allocate a handle for use with the server-side RPC functions.
 *
 * An arbitrary caller context can be associated with the handle
 * via data; it will not be dereferenced by the handle API.
 */
ndr_hdid_t *
ndr_hdalloc(const ndr_xa_t *xa, const void *data)
{
    static ndr_hdid_t id;
    ndr_handle_t *hd;
    uuid_t uu;

    if ((hd = malloc(sizeof (ndr_handle_t))) == NULL)
        return (NULL);

    if (id.data2 == 0) {
        uuid_generate_random(uu);
        bcopy(uu, &id.data2, sizeof (uuid_t));
        id.data1 = 0;
        id.data2 = 0;
    }

    ++id.data2;

    bcopy(&id, &hd->nh_id, sizeof (ndr_hdid_t));
    hd->nh_fid = xa->fid;
    hd->nh_svc = xa->binding->service;
    hd->nh_data = (void *)data;
    hd->nh_data_free = NULL;

    (void) mutex_lock(&ndr_handle_lock);
    hd->nh_next = ndr_handle_list;
    ndr_handle_list = hd;
    (void) mutex_unlock(&ndr_handle_lock);

    return (&hd->nh_id);
}

/*
 * Remove a handle from the global list and free it.
 */
void
ndr_hdfree(const ndr_xa_t *xa, const ndr_hdid_t *id)
{
    ndr_service_t *svc = xa->binding->service;
    ndr_handle_t *hd;
    ndr_handle_t **pphd;

    assert(id);

    (void) mutex_lock(&ndr_handle_lock);
    pphd = &ndr_handle_list;

    while (*pphd) {
        hd = *pphd;

        if (bcmp(&hd->nh_id, id, sizeof (ndr_hdid_t)) == 0) {
            if (hd->nh_svc == svc) {
                *pphd = hd->nh_next;
                free(hd);
            }
            break;
        }

        pphd = &(*pphd)->nh_next;
    }

    (void) mutex_unlock(&ndr_handle_lock);
}

/*
 * Lookup a handle by id.  If the handle is in the list and it matches
 * the specified service, a pointer to it is returned.  Otherwise a null
 * pointer is returned.
 */
ndr_handle_t *
ndr_hdlookup(const ndr_xa_t *xa, const ndr_hdid_t *id)
{
    ndr_service_t *svc = xa->binding->service;
    ndr_handle_t *hd;

    assert(id);
    (void) mutex_lock(&ndr_handle_lock);
    hd = ndr_handle_list;

    while (hd) {
        if (bcmp(&hd->nh_id, id, sizeof (ndr_hdid_t)) == 0) {
            if (hd->nh_svc != svc)
                break;
            (void) mutex_unlock(&ndr_handle_lock);
            return (hd);
        }

        hd = hd->nh_next;
    }

    (void) mutex_unlock(&ndr_handle_lock);
    return (NULL);
}

/*
 * Called when a pipe is closed to release any associated handles.
 */
void
ndr_hdclose(int fid)
{
    ndr_handle_t *hd;
    ndr_handle_t **pphd;

    (void) mutex_lock(&ndr_handle_lock);
    pphd = &ndr_handle_list;

    while (*pphd) {
        hd = *pphd;

        if (hd->nh_fid == fid) {
            *pphd = hd->nh_next;

            if (hd->nh_data_free)
                (*hd->nh_data_free)(hd->nh_data);

            free(hd);
            continue;
        }

        pphd = &(*pphd)->nh_next;
    }

    (void) mutex_unlock(&ndr_handle_lock);
}

/*
 * Convert a UUID to a string.
 */
void
ndr_uuid_unparse(ndr_uuid_t *uuid, char *out)
{
    (void) sprintf(out, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
        uuid->data1, uuid->data2, uuid->data3,
        uuid->data4[0], uuid->data4[1],
        uuid->data4[2], uuid->data4[3],
        uuid->data4[4], uuid->data4[5],
        uuid->data4[6], uuid->data4[7]);
}

/*
 * Convert a string to a UUID.
 */
int
ndr_uuid_parse(char *in, ndr_uuid_t *uuid)
{
    char        *p = in;
    char        *q;
    char        buf[4];
    int     i;

    if (strlen(in) != UUID_PRINTABLE_STRING_LENGTH - 1)
        return (-1);

    uuid->data1 = strtoul(p, &p, 16);
    if (*p != '-')
        return (-1);
    p++;

    uuid->data2 = strtol(p, &p, 16);
    if (*p != '-')
        return (-1);
    p++;

    uuid->data3 = strtol(p, &p, 16);
    if (*p != '-')
        return (-1);
    p++;

    for (i = 0; i < 8; i++) {
        if (*p ==  '-')
            p++;

        if (p[0] == 0 || p[1] == 0)
            return (-1);

        buf[0] = *p++;
        buf[1] = *p++;
        buf[2] = 0;
        uuid->data4[i] = strtol(buf, &q, 16);
        if (*q != 0)
            return (-1);
    }

    if (*p != 0)
        return (-1);

    return (0);
}

void
ndr_svc_binding_pool_init(ndr_binding_t **headpp, ndr_binding_t pool[],
    int n_pool)
{
    ndr_binding_t   *head = NULL;
    int     ix;

    for (ix = n_pool - 1; ix >= 0; ix--) {
        pool[ix].next = head;
        pool[ix].service = NULL;
        pool[ix].p_cont_id = 0xffff;
        pool[ix].instance_specific = 0;
        head = &pool[ix];
    }

    *headpp = head;
}

ndr_binding_t *
ndr_svc_find_binding(ndr_xa_t *mxa, ndr_p_context_id_t p_cont_id)
{
    ndr_binding_t *mbind;

    for (mbind = mxa->binding_list; mbind; mbind = mbind->next) {
        if (mbind->service != NULL &&
            mbind->which_side == NDR_BIND_SIDE_SERVER &&
            mbind->p_cont_id == p_cont_id)
            break;
    }

    return (mbind);
}

ndr_binding_t *
ndr_svc_new_binding(ndr_xa_t *mxa)
{
    ndr_binding_t *mbind;

    for (mbind = mxa->binding_list; mbind; mbind = mbind->next) {
        if (mbind->service == NULL)
            break;
    }

    return (mbind);
}

/*
 * Move bytes between a buffer and a uio structure.
 * The transfer direction is controlled by rw:
 *  UIO_READ:  transfer from buf to uio
 *  UIO_WRITE: transfer from uio to buf
 *
 * Returns the number of bytes moved.
 */
ssize_t
ndr_uiomove(caddr_t buf, size_t buflen, enum uio_rw rw, struct uio *uio)
{
    struct iovec *iov;
    int reading = (rw == UIO_READ);
    size_t nbytes;
    size_t nxfer = 0;

    assert(rw == UIO_READ || rw == UIO_WRITE);

    while (buflen && uio->uio_resid && uio->uio_iovcnt) {
        iov = uio->uio_iov;
        if ((nbytes = iov->iov_len) == 0) {
            uio->uio_iov++;
            uio->uio_iovcnt--;
            continue;
        }

        if (nbytes > buflen)
            nbytes = buflen;

        if (reading)
            bcopy(buf, iov->iov_base, nbytes);
        else
            bcopy(iov->iov_base, buf, nbytes);

        iov->iov_base = (caddr_t)iov->iov_base + nbytes;
        iov->iov_len -= nbytes;
        uio->uio_resid -= nbytes;
        uio->uio_offset += nbytes;
        buf += nbytes;
        buflen -= nbytes;
        nxfer += nbytes;
    }

    return (nxfer);
}