smbsrv/smbd/smbd_share_doorsvc.c

	smbd_share_doorsvc.c revision b819cea2f73f98c5662230cc9affc8cc84f77fcf
/*
 * 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.
 */

/*
 * LanMan share door server
 */

#include <door.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <syslog.h>
#include <string.h>
#include <strings.h>
#include <pthread.h>
#include <smbsrv/libsmb.h>
#include <smbsrv/smb_share.h>
#include <smbsrv/smbinfo.h>
#include "smbd.h"

#define SMB_SHARE_DSRV_VERSION  1
#define SMB_SHARE_DSRV_COOKIE   ((void*)(0xdeadbeef^SMB_SHARE_DSRV_VERSION))

static int smb_share_dsrv_fd = -1;
static pthread_mutex_t smb_share_dsrv_mtx = PTHREAD_MUTEX_INITIALIZER;
static smbd_door_t smb_share_sdh;

static void smbd_share_dispatch(void *, char *, size_t, door_desc_t *, uint_t);

/*
 * Start the LanMan share door service.
 * Returns 0 on success. Otherwise, -1.
 */
int
smbd_share_start(void)
{
    int     newfd;
    const char  *door_name;

    (void) pthread_mutex_lock(&smb_share_dsrv_mtx);

    if (smb_share_dsrv_fd != -1) {
        syslog(LOG_ERR, "smbd_share_start: duplicate");
        (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
        return (smb_share_dsrv_fd);
    }

    smbd_door_init(&smb_share_sdh, "share");

    if ((smb_share_dsrv_fd = door_create(smbd_share_dispatch,
        SMB_SHARE_DSRV_COOKIE, (DOOR_UNREF | DOOR_REFUSE_DESC))) < 0) {
        syslog(LOG_ERR, "smbd_share_start: door_create: %s",
            strerror(errno));
        (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
        return (-1);
    }

    door_name = getenv("SMB_SHARE_DNAME");
    if (door_name == NULL)
        door_name = SMB_SHARE_DNAME;

    (void) unlink(door_name);

    if ((newfd = creat(door_name, 0644)) < 0) {
        syslog(LOG_ERR, "smbd_share_start: open: %s",
            strerror(errno));
        (void) door_revoke(smb_share_dsrv_fd);
        smb_share_dsrv_fd = -1;
        (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
        return (-1);
    }

    (void) close(newfd);
    (void) fdetach(door_name);

    if (fattach(smb_share_dsrv_fd, door_name) < 0) {
        syslog(LOG_ERR, "smbd_share_start: fattach: %s",
            strerror(errno));
        (void) door_revoke(smb_share_dsrv_fd);
        smb_share_dsrv_fd = -1;
        (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
        return (-1);
    }

    (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
    return (smb_share_dsrv_fd);
}

/*
 * Stop the LanMan share door service.
 */
void
smbd_share_stop(void)
{
    (void) pthread_mutex_lock(&smb_share_dsrv_mtx);

    smbd_door_fini(&smb_share_sdh);

    if (smb_share_dsrv_fd != -1) {
        const char *door_name;

        door_name = getenv("SMB_SHARE_DNAME");
        if (door_name == NULL)
            door_name = SMB_SHARE_DNAME;
        (void) fdetach(door_name);
        (void) door_revoke(smb_share_dsrv_fd);
        smb_share_dsrv_fd = -1;
    }

    (void) pthread_mutex_unlock(&smb_share_dsrv_mtx);
}

/*
 * This function with which the LMSHARE door is associated
 * will invoke the appropriate CIFS share management function
 * based on the request type of the door call.
 */
/*ARGSUSED*/
static void
smbd_share_dispatch(void *cookie, char *ptr, size_t size, door_desc_t *dp,
    uint_t n_desc)
{
    uint32_t rc;
    int req_type;
    char buf[SMB_SHARE_DSIZE];
    unsigned int used;
    smb_dr_ctx_t *dec_ctx;
    smb_dr_ctx_t *enc_ctx;
    unsigned int dec_status;
    unsigned int enc_status;
    char *sharename, *sharename2;
    smb_share_t lmshr_info;
    smb_shrlist_t lmshr_list;
    int offset;

    smbd_door_enter(&smb_share_sdh);

    if ((cookie != SMB_SHARE_DSRV_COOKIE) || (ptr == NULL) ||
        (size < sizeof (uint32_t))) {
        smbd_door_return(&smb_share_sdh, NULL, 0, NULL, 0);
    }

    dec_ctx = smb_dr_decode_start(ptr, size);
    enc_ctx = smb_dr_encode_start(buf, sizeof (buf));
    req_type = smb_dr_get_uint32(dec_ctx);

    switch (req_type) {
    case SMB_SHROP_NUM_SHARES:
        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0)
            goto decode_error;

        rc = smb_shr_count();
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_uint32(enc_ctx, rc);
        break;

    case SMB_SHROP_DELETE:
        sharename = smb_dr_get_string(dec_ctx);

        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0) {
            smb_dr_free_string(sharename);
            goto decode_error;
        }

        rc = smb_shr_remove(sharename);
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_uint32(enc_ctx, rc);
        smb_dr_free_string(sharename);
        break;

    case SMB_SHROP_RENAME:
        sharename = smb_dr_get_string(dec_ctx);
        sharename2 = smb_dr_get_string(dec_ctx);

        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0) {
            smb_dr_free_string(sharename);
            smb_dr_free_string(sharename2);
            goto decode_error;
        }

        rc = smb_shr_rename(sharename, sharename2);
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_uint32(enc_ctx, rc);
        smb_dr_free_string(sharename);
        smb_dr_free_string(sharename2);
        break;

    case SMB_SHROP_ADD:
        smb_dr_get_share(dec_ctx, &lmshr_info);
        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0)
            goto decode_error;

        rc = smb_shr_add(&lmshr_info);
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_uint32(enc_ctx, rc);
        smb_dr_put_share(enc_ctx, &lmshr_info);
        break;

    case SMB_SHROP_MODIFY:
        smb_dr_get_share(dec_ctx, &lmshr_info);
        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0) {
            goto decode_error;
        }

        rc = smb_shr_modify(&lmshr_info);
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_uint32(enc_ctx, rc);

        break;

    case SMB_SHROP_LIST:
        offset = smb_dr_get_int32(dec_ctx);
        if ((dec_status = smb_dr_decode_finish(dec_ctx)) != 0)
            goto decode_error;

        smb_shr_list(offset, &lmshr_list);
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DSUCCESS);
        smb_dr_put_buf(enc_ctx, (unsigned char *)&lmshr_list,
            sizeof (smb_shrlist_t));
        break;

    default:
        dec_status = smb_dr_decode_finish(dec_ctx);
        goto decode_error;
    }

    if ((enc_status = smb_dr_encode_finish(enc_ctx, &used)) != 0) {
        enc_ctx = smb_dr_encode_start(buf, sizeof (buf));
        smb_dr_put_int32(enc_ctx, SMB_SHARE_DERROR);
        smb_dr_put_uint32(enc_ctx, enc_status);
        (void) smb_dr_encode_finish(enc_ctx, &used);
    }

    smbd_door_return(&smb_share_sdh, buf, used, NULL, 0);
    return;

decode_error:
    smb_dr_put_int32(enc_ctx, SMB_SHARE_DERROR);
    smb_dr_put_uint32(enc_ctx, dec_status);
    (void) smb_dr_encode_finish(enc_ctx, &used);
    smbd_door_return(&smb_share_sdh, buf, used, NULL, 0);
}