libsmbfs/common/smbfs_iod_cl.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) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
 */

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

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <strings.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 <smb/ntstatus.h>
#include "smbfs_lib.h"
#include <netsmb/netbios.h>
#include "smbfs_nb_lib.h"
#include <netsmb/smb_dev.h>

#include <assert.h>

#include "smbfs_charsets.h"
#include "smbfs_private.h"

/*
 * This is constant for the life of a process,
 * and initialized at startup, so no locks.
 */
static char door_path[64];
static int iod_start_timeout = 10;  /* seconds */

char *
smbfs_iod_door_path(void)
{
    uid_t uid;
    int x;

    if (door_path[0] == '\0') {
        uid = getuid();
        x = snprintf(door_path, sizeof (door_path),
            SMBIOD_USR_DOOR, uid);
        assert(x <= sizeof (door_path));
    }

    return (door_path);
}

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

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

    /*
     * Make sure the IOD is running.
     * Pass NULL args.
     */
    (void) memset(&da, 0, sizeof (da));
    bzero((void *) &rval, sizeof (rval));

    da.rbuf = (void *) &rval;
    da.rsize = sizeof (rval);
    rc = door_call(fd, &da);
    if (rc < 0) {
        err = errno;
        (void) close(fd);
        return (err);
    }
    if (rval.r_err != 0) {
        (void) close(fd);
        return (rval.r_err);
    }

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

    *fdp = fd;
    return (0);
}

/*
 * Get a door handle to the IOD, starting it if necessary.
 * On success, sets ctx->ct_door_fd
 */
int
smbfs_iod_cl_start(smb_ctx_t *ctx)
{
    int err, tmo;
    int fd = -1;

    tmo = iod_start_timeout;
    while ((err = smbfs_iod_open_door(&fd)) != 0) {
        if (--tmo <= 0)
            goto errout;

        /*
         * We have no per-user IOD yet.  Request one.
         * Do this request every time through the loop
         * because the master IOD will only start our
         * per-user IOD if we don't have one, and our
         * first requst could have happened while we
         * had an IOD that was doing shutdown.
         * (Prevents a shutdown/startup race).
         */
        err = smbfs_iod_start();
        if (err != 0)
            goto errout;
        /*
         * Wait for it to get ready.
         */
        (void) sleep(1);
    }

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

    return (0);

errout:
    smbfs_error(dgettext(TEXT_DOMAIN,
        "Could not contact service: %s"),
        0, "svc:/network/smb/client");
    return (ENOTACTIVE);
}

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

    bzero((void *) &rval, sizeof (rval));

    /* 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 *) &rval;
    da.rsize = sizeof (rval);
    if (door_call(ctx->ct_door_fd, &da) < 0) {
        err = errno;
        DPRINT("door_call, err=%d", err);
        return (err);
    }

    err = rval.r_err;
    ctx->ct_ntstatus = rval.r_ntstatus;

    return (err);
}

/*
 * Functions called by the IO deamon (IOD).
 * Here in the library to simplify testing.
 * Be the reader thread for this VC.
 */
int
smbfs_iod_work(smb_ctx_t *ctx)
{
    smbioc_ssn_work_t *work = &ctx->ct_work;
    int vcst, err = 0;

    DPRINT("server: %s", ctx->ct_srvname);

    /* Calle should have opened these */
    if (ctx->ct_tran_fd == -1 || ctx->ct_dev_fd == -1) {
        err = EINVAL;
        goto out;
    }

    /*
     * This is the reader / reconnect loop.
     *
     * We could start with state "idle", but
     * we know someone wants a connection to
     * this server, so start in "vcactive".
     *
     * XXX: Add some syslog calls in here?
     */
    vcst = SMBIOD_ST_VCACTIVE;

    for (;;) {

        switch (vcst) {
        case SMBIOD_ST_IDLE:
            /*
             * Wait for driver requests to arrive
             * for this VC, then return here.
             * Next state is normally RECONNECT.
             */
            DPRINT("state: idle");
            if (ioctl(ctx->ct_dev_fd,
                SMBIOC_IOD_IDLE, &vcst) == -1) {
                err = errno;
                DPRINT("ioc_idle: err %d", err);
                goto out;
            }
            continue;

        case SMBIOD_ST_RECONNECT:
            DPRINT("state: reconnect");
            err = smbfs_iod_connect(ctx);
            if (err == 0) {
                vcst = SMBIOD_ST_VCACTIVE;
                continue;
            }
            DPRINT("_iod_connect: err %d", err);
            /*
             * If the error was EAUTH, retry is
             * not likely to succeed either, so
             * just exit this thread.  The user
             * will need to run smbutil to get
             * a new thread with new auth info.
             */
            if (err == EAUTH)
                goto out;
            vcst = SMBIOD_ST_RCFAILED;
            continue;

        case SMBIOD_ST_RCFAILED:
            DPRINT("state: rcfailed");
            /*
             * Reconnect failed.  Kill off any
             * requests waiting in the driver,
             * then get ready to try again.
             * Next state is normally IDLE.
             */
            if (ioctl(ctx->ct_dev_fd,
                SMBIOC_IOD_RCFAIL, &vcst) == -1) {
                err = errno;
                DPRINT("ioc_rcfail: err %d", err);
                goto out;
            }
            continue;

        case SMBIOD_ST_VCACTIVE:
            DPRINT("state: active");
            if (ioctl(ctx->ct_dev_fd,
                SMBIOC_IOD_WORK, work) == -1) {
                err = errno;
                DPRINT("ioc_work: err %d", err);
                goto out;
            }
            vcst = work->wk_out_state;
            continue;

        case SMBIOD_ST_DEAD:
            DPRINT("state: dead");
            err = 0;
            goto out;

        default:
            DPRINT("state: BAD(%d)", vcst);
            err = EFAULT;
            goto out;
        }
    }

out:
    if (ctx->ct_tran_fd != -1) {
        (void) close(ctx->ct_tran_fd);
        ctx->ct_tran_fd = -1;
    }
    if (ctx->ct_dev_fd != -1) {
        (void) close(ctx->ct_dev_fd);
        ctx->ct_dev_fd = -1;
    }

    return (err);
}