libshare/smb/smb_share_doorclnt.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, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * User-space door client for LanMan share management.
 */

#include <syslog.h>
#include <door.h>
#include <fcntl.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <thread.h>
#include <synch.h>

#include <smbsrv/libsmb.h>
#include <smbsrv/smb_share.h>
#include <smbsrv/smb.h>

#define SMB_SHARE_DOOR_CALL_RETRIES     3

static int smb_share_dfd = -1;
static uint64_t smb_share_dncall = 0;
static mutex_t smb_share_dmtx;
static cond_t smb_share_dcv;

static int smb_share_door_clnt_open(void);
static void smb_share_door_clnt_close(void);

void
smb_share_door_clnt_init(void)
{
    (void) mutex_lock(&smb_share_dmtx);
    (void) smb_share_door_clnt_open();
    (void) mutex_unlock(&smb_share_dmtx);
}

void
smb_share_door_clnt_fini(void)
{
    (void) mutex_lock(&smb_share_dmtx);
    smb_share_door_clnt_close();
    (void) mutex_unlock(&smb_share_dmtx);
}

/*
 * Open smb_share_door.  This is a private call for use by
 * smb_share_door_clnt_enter() and must be called with smb_share_dmtx held.
 *
 * Returns the door fd on success.  Otherwise, -1.
 */
static int
smb_share_door_clnt_open(void)
{
    const char  *door_name;

    if (smb_share_dfd == -1) {
        door_name = getenv("SMB_SHARE_DNAME");
        if (door_name == NULL)
            door_name = SMB_SHARE_DNAME;

        if ((smb_share_dfd = open(door_name, O_RDONLY)) < 0)
            smb_share_dfd = -1;
        else
            smb_share_dncall = 0;
    }

    return (smb_share_dfd);
}

/*
 * Close smb_share_door.
 * Private call that must be called with smb_share_dmtx held.
 */
static void
smb_share_door_clnt_close(void)
{
    if (smb_share_dfd != -1) {
        while (smb_share_dncall > 0)
            (void) cond_wait(&smb_share_dcv, &smb_share_dmtx);

        if (smb_share_dfd != -1) {
            (void) close(smb_share_dfd);
            smb_share_dfd = -1;
        }
    }
}

/*
 * Entry handler for smb_share_door calls.
 */
static door_arg_t *
smb_share_door_clnt_enter(void)
{
    door_arg_t *arg;
    char *buf;

    (void) mutex_lock(&smb_share_dmtx);

    if (smb_share_door_clnt_open() == -1) {
        (void) mutex_unlock(&smb_share_dmtx);
        return (NULL);
    }

    if ((arg = malloc(sizeof (door_arg_t) + SMB_SHARE_DSIZE)) != NULL) {
        buf = ((char *)arg) + sizeof (door_arg_t);
        bzero(arg, sizeof (door_arg_t));
        arg->data_ptr = buf;
        arg->rbuf = buf;
        arg->rsize = SMB_SHARE_DSIZE;

        ++smb_share_dncall;
    }

    (void) mutex_unlock(&smb_share_dmtx);
    return (arg);
}

/*
 * Exit handler for smb_share_door calls.
 */
static void
smb_share_door_clnt_exit(door_arg_t *arg, boolean_t must_close, char *errmsg)
{
    if (errmsg)
        syslog(LOG_DEBUG, "smb_share_door: %s failed", errmsg);

    (void) mutex_lock(&smb_share_dmtx);
    free(arg);
    --smb_share_dncall;
    (void) cond_signal(&smb_share_dcv);

    if (must_close)
        smb_share_door_clnt_close();

    (void) mutex_unlock(&smb_share_dmtx);
}

static int
smb_share_door_call(int fd, door_arg_t *arg)
{
    int rc;
    int i;

    for (i = 0; i < SMB_SHARE_DOOR_CALL_RETRIES; ++i) {
        errno = 0;

        if ((rc = door_call(fd, arg)) == 0)
            break;

        if (errno != EAGAIN && errno != EINTR)
            break;
    }

    return (rc);
}

static int
smb_share_dchk(smb_dr_ctx_t *dec_ctx)
{
    int status = smb_dr_get_int32(dec_ctx);

    if (status != SMB_SHARE_DSUCCESS) {
        if (status == SMB_SHARE_DERROR)
            (void) smb_dr_get_uint32(dec_ctx);
        return (-1);
    }

    return (0);
}

uint32_t
smb_share_list(int offset, smb_shrlist_t *list)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t rc;

    bzero(list, sizeof (smb_shrlist_t));

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (NERR_InternalError);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_LIST);
    smb_dr_put_int32(enc_ctx, offset);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (NERR_InternalError);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (NERR_InternalError);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    (void) smb_dr_get_buf(dec_ctx, (unsigned char *)list,
        sizeof (smb_shrlist_t));
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (NERR_Success);
}

int
smb_share_count(void)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t num_shares;
    int rc;

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (-1);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_NUM_SHARES);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (-1);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (-1);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (-1);
    }

    num_shares = smb_dr_get_uint32(dec_ctx);
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (-1);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (num_shares);
}

uint32_t
smb_share_delete(char *share_name)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t rc;

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (NERR_InternalError);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_DELETE);
    smb_dr_put_string(enc_ctx, share_name);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (NERR_InternalError);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (NERR_InternalError);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    rc = smb_dr_get_uint32(dec_ctx);
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (rc);

}

uint32_t
smb_share_rename(char *from, char *to)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t rc;

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (NERR_InternalError);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_RENAME);
    smb_dr_put_string(enc_ctx, from);
    smb_dr_put_string(enc_ctx, to);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (NERR_InternalError);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (NERR_InternalError);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    rc = smb_dr_get_uint32(dec_ctx);
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (rc);
}

uint32_t
smb_share_create(smb_share_t *si)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t rc;

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (NERR_InternalError);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_ADD);
    smb_dr_put_share(enc_ctx, si);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (NERR_InternalError);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (NERR_InternalError);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    rc = smb_dr_get_uint32(dec_ctx);
    smb_dr_get_share(dec_ctx, si);
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (rc);
}

uint32_t
smb_share_modify(smb_share_t *si)
{
    door_arg_t *arg;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    uint32_t rc;

    if ((arg = smb_share_door_clnt_enter()) == NULL)
        return (NERR_InternalError);

    enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
    smb_dr_put_uint32(enc_ctx, SMB_SHROP_MODIFY);
    smb_dr_put_share(enc_ctx, si);

    rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
    if (rc != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "encode");
        return (NERR_InternalError);
    }

    if (smb_share_door_call(smb_share_dfd, arg) < 0) {
        smb_share_door_clnt_exit(arg, B_TRUE, "door call");
        return (NERR_InternalError);
    }

    dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
    if (smb_share_dchk(dec_ctx) != 0) {
        (void) smb_dr_decode_finish(dec_ctx);
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    rc = smb_dr_get_uint32(dec_ctx);
    if (smb_dr_decode_finish(dec_ctx) != 0) {
        smb_share_door_clnt_exit(arg, B_FALSE, "decode");
        return (NERR_InternalError);
    }

    smb_share_door_clnt_exit(arg, B_FALSE, NULL);
    return (rc);
}