/*
 * 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, 2010, 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 <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 <assert.h>

#include "charsets.h"
#include "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 *
smb_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
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);
}

/*
 * Request the creation of our per-user smbiod
 * via door call to the "main" IOD service.
 */
static int
start_iod(void)
{
        const char *svc_door = SMBIOD_SVC_DOOR;
        door_arg_t da;
        int32_t cmd, err;
        int fd, rc;

        fd = open(svc_door, O_RDONLY, 0);
        if (fd < 0) {
                err = errno;
                DPRINT("%s: open failed, err %d", svc_door, err);
                return (err);
        }
        cmd = SMBIOD_START;
        memset(&da, 0, sizeof (da));
        da.data_ptr = (void *) &cmd;
        da.data_size = sizeof (cmd);
        da.rbuf = (void *) &err;
        da.rsize = sizeof (err);
        rc = door_call(fd, &da);
        close(fd);
        if (rc < 0) {
                err = errno;
                DPRINT("door_call, err %d", err);
                return (err);
        }

        return (err);
}

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

        tmo = iod_start_timeout;
        while ((err = smb_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 = start_iod();
                if (err != 0)
                        goto errout;
                /*
                 * Wait for it to get ready.
                 */
                (void) sleep(1);
        }

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

        return (0);

errout:
        smb_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
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);
}