libsmbfs/smb/iod_cl.c

	iod_cl.c revision 02d09e03eb27f3a2dc299de704e45dae5173f43f
/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Client-side interface to the IO Daemon (IOD)
 */

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <libintl.h>
#include <door.h>

#include <sys/byteorder.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>

#include <netsmb/smb_lib.h>
#include <netsmb/netbios.h>
#include <netsmb/nb_lib.h>
#include <netsmb/smb_dev.h>

#include "charsets.h"
#include "private.h"

static const char smbiod_path[] = "/usr/lib/smbfs/smbiod";

/*
 * This is constant for the life of a process,
 * and initialized at startup, so no locks.
 */
static char door_path[40];
static int iod_start_timeout = 10;  /* seconds */

char *
smb_iod_door_path(void)
{
    static const char fmtR[] = "/var/run/smbiod-%d";
    static const char fmtU[] = "/tmp/.smbiod-%d";
    const char *fmt;
    uid_t uid;

    if (door_path[0] == '\0') {
        uid = getuid();
        fmt = (uid == 0) ? fmtR : fmtU;
        snprintf(door_path, sizeof (door_path), fmt, uid);
    }

    return (door_path);
}

/*
 * Open the door (client side) and
 * find out if the service is there.
 */
int
smb_iod_open_door(int *fdp)
{
    door_arg_t da;
    char *path;
    int fd, rc;
    int err = 0;

    path = smb_iod_door_path();
    fd = open(path, O_RDONLY, 0);
    if (fd < 0)
        return (errno);

    /*
     * Make sure the IOD is running.
     * Pass NULL args.
     */
    memset(&da, 0, sizeof (da));
    da.rbuf = (void *) &err;
    da.rsize = sizeof (err);
    rc = door_call(fd, &da);
    if (rc < 0) {
        err = errno;
        close(fd);
        return (err);
    }
    if (err != 0) {
        close(fd);
        return (err);
    }

    /* This handle controls per-process resources. */
    (void) fcntl(fd, F_SETFD, FD_CLOEXEC);

    *fdp = fd;
    return (0);
}

/*
 * Start the IOD (if not already running) and
 * wait until its door service is ready.
 * On success, sets ctx->ct_door_fd
 */
int
smb_iod_start(smb_ctx_t *ctx)
{
    int err, pid, tmo;
    int fd = -1;

    err = smb_iod_open_door(&fd);
    if (err == 0)
        goto OK;

    pid = vfork();
    if (pid < 0)
        return (errno);

    /*
     * child: start smbiod
     */
    if (pid == 0) {
        char *argv[2];
        argv[0] = "smbiod";
        argv[1] = NULL;
        (void) execv(smbiod_path, argv);
        _exit(1);
    }

    /*
     * parent: wait for smbiod to start
     */
    tmo = iod_start_timeout;
    while (--tmo >= 0) {
        (void) sleep(1);
        err = smb_iod_open_door(&fd);
        if (err == 0)
            goto OK;
    }
    return (err);

OK:
    /* Save the door fd. */
    if (ctx->ct_door_fd != -1)
        close(ctx->ct_door_fd);
    ctx->ct_door_fd = fd;

    return (0);
}


/*
 * Ask the IOD to connect using the info in ctx.
 * Called by newvc.
 */
int
smb_iod_cl_newvc(smb_ctx_t *ctx)
{
    door_arg_t da;
    int err = 0;

    /* Should already have the IOD door. */
    if (ctx->ct_door_fd < 0)
        return (EINVAL);

    da.data_ptr = (void *) &ctx->ct_iod_ssn;
    da.data_size = sizeof (ctx->ct_iod_ssn);
    da.desc_ptr = NULL;
    da.desc_num = 0;
    da.rbuf = (void *) &err;
    da.rsize = sizeof (err);
    if (door_call(ctx->ct_door_fd, &da) < 0) {
        err = errno;
        DPRINT("door_call, err=%d", err);
    }

    return (err);
}