/*
 * 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.
 *
 * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * 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"

/*
 * The user agent (smbiod) calls smb_iod_connect for the first
 * connection to some server, and if that succeeds, will start a
 * thread running this function, passing the smb_ctx_t
 *
 * This thread now enters the driver and stays there, reading
 * network responses as long as the connection is alive.
 */
int
smb_iod_work(smb_ctx_t *ctx)
{
        smbioc_ssn_work_t *work = &ctx->ct_work;
        int     err = 0;

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

        /*
         * 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?
         */

        for (;;) {

                DPRINT("state: %s",
                    smb_iod_state_name(work->wk_out_state));

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

                case SMBIOD_ST_RECONNECT:
                        DPRINT("Call _iod_connect...");
                        err = smb_iod_connect(ctx);
                        if (err == 0)
                                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) {
                                DPRINT("iod_connect: EAUTH (give up)");
                                goto out;
                        }
                        /*
                         * Reconnect failed.  Notify any requests
                         * that we're not connected, and delay.
                         * Next state will be IDLE or RECONNECT.
                         */
                        DPRINT("Call _iod_rcfail...");
                        if (nsmb_ioctl(ctx->ct_dev_fd,
                            SMBIOC_IOD_RCFAIL, work) == -1) {
                                err = errno;
                                DPRINT("iod_rcfail: err %d", err);
                                goto out;
                        }
                        continue;

                case SMBIOD_ST_AUTHOK:
                        /*
                         * This is where we enter the driver and
                         * stay there.  While the connection is up
                         * the VC will have SMBIOD_ST_VCACTIVE
                         */
                        DPRINT("Call _iod_work...");
                        if (nsmb_ioctl(ctx->ct_dev_fd,
                            SMBIOC_IOD_WORK, work) == -1) {
                                err = errno;
                                DPRINT("iod_work: err %d", err);
                                goto out;
                        }
                        DPRINT("Ret. from _ioc_work");
                        continue;

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

                default:
                        DPRINT("Unexpected state: %d (%s)",
                            work->wk_out_state,
                            smb_iod_state_name(work->wk_out_state));
                        err = EFAULT;
                        goto out;
                }
        }

out:
        if (ctx->ct_dev_fd != -1) {
                nsmb_close(ctx->ct_dev_fd);
                ctx->ct_dev_fd = -1;
        }

        return (err);
}