libsmbfs/smb/iod_wk.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 2012 Nexenta Systems, Inc.  All rights reserved.
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Functions called by the IO deamon (IOD).
 * Here in the library to simplify testing.
 */

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

/*
 * Be the reader thread for this VC.
 */
int
smb_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 = smb_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;
            /*
             * Go ahead and close the transport now,
             * rather than wait until reconnect to
             * this server.
             */
            close(ctx->ct_tran_fd);
            ctx->ct_tran_fd = -1;
            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) {
        close(ctx->ct_tran_fd);
        ctx->ct_tran_fd = -1;
    }
    if (ctx->ct_dev_fd != -1) {
        close(ctx->ct_dev_fd);
        ctx->ct_dev_fd = -1;
    }

    return (err);
}