sbin/ggate/ggatec/ggatec.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <stdint.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <libgen.h>
  39 #include <pthread.h>
  40 #include <signal.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <assert.h>
  44
  45 #include <sys/param.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/socket.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/syslog.h>
  50 #include <sys/time.h>
  51 #include <sys/bio.h>
  52 #include <netinet/in.h>
  53 #include <netinet/tcp.h>
  54 #include <arpa/inet.h>
  55
  56 #include <geom/gate/g_gate.h>
  57 #include "ggate.h"
  58
  59
  60 static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
  61
  62 static const char *path = NULL;
  63 static const char *host = NULL;
  64 static int unit = G_GATE_UNIT_AUTO;
  65 static unsigned flags = 0;
  66 static int force = 0;
  67 static unsigned queue_size = G_GATE_QUEUE_SIZE;
  68 static unsigned port = G_GATE_PORT;
  69 static off_t mediasize;
  70 static unsigned sectorsize = 0;
  71 static unsigned timeout = G_GATE_TIMEOUT;
  72 static int sendfd, recvfd;
  73 static uint32_t token;
  74 static pthread_t sendtd, recvtd;
  75 static int reconnect;
  76
  77 static void
  78 usage(void)
  79 {
  80
  81         fprintf(stderr, "usage: %s create [-nv] [-o <ro|wo|rw>] [-p port] "
  82             "[-q queue_size] [-R rcvbuf] [-S sndbuf] [-s sectorsize] "
  83             "[-t timeout] [-u unit] <host> <path>\n", getprogname());
  84         fprintf(stderr, "       %s rescue [-nv] [-o <ro|wo|rw>] [-p port] "
  85             "[-R rcvbuf] [-S sndbuf] <-u unit> <host> <path>\n", getprogname());
  86         fprintf(stderr, "       %s destroy [-f] <-u unit>\n", getprogname());
  87         fprintf(stderr, "       %s list [-v] [-u unit]\n", getprogname());
  88         exit(EXIT_FAILURE);
  89 }
  90
  91 static void *
  92 send_thread(void *arg __unused)
  93 {
  94         struct g_gate_ctl_io ggio;
  95         struct g_gate_hdr hdr;
  96         char buf[MAXPHYS];
  97         ssize_t data;
  98         int error;
  99
 100         g_gate_log(LOG_NOTICE, "%s: started!", __func__);
 101
 102         ggio.gctl_version = G_GATE_VERSION;
 103         ggio.gctl_unit = unit;
 104         ggio.gctl_data = buf;
 105
 106         for (;;) {
 107                 ggio.gctl_length = sizeof(buf);
 108                 ggio.gctl_error = 0;
 109                 g_gate_ioctl(G_GATE_CMD_START, &ggio);
 110                 error = ggio.gctl_error;
 111                 switch (error) {
 112                 case 0:
 113                         break;
 114                 case ECANCELED:
 115                         if (reconnect)
 116                                 break;
 117                         /* Exit gracefully. */
 118                         g_gate_close_device();
 119                         exit(EXIT_SUCCESS);
 120 #if 0
 121                 case ENOMEM:
 122                         /* Buffer too small. */
 123                         ggio.gctl_data = realloc(ggio.gctl_data,
 124                             ggio.gctl_length);
 125                         if (ggio.gctl_data != NULL) {
 126                                 bsize = ggio.gctl_length;
 127                                 goto once_again;
 128                         }
 129                         /* FALLTHROUGH */
 130 #endif
 131                 case ENXIO:
 132                 default:
 133                         g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME,
 134                             strerror(error));
 135                 }
 136
 137                 if (reconnect)
 138                         break;
 139
 140                 switch (ggio.gctl_cmd) {
 141                 case BIO_READ:
 142                         hdr.gh_cmd = GGATE_CMD_READ;
 143                         break;
 144                 case BIO_WRITE:
 145                         hdr.gh_cmd = GGATE_CMD_WRITE;
 146                         break;
 147                 }
 148                 hdr.gh_seq = ggio.gctl_seq;
 149                 hdr.gh_offset = ggio.gctl_offset;
 150                 hdr.gh_length = ggio.gctl_length;
 151                 hdr.gh_error = 0;
 152                 g_gate_swap2n_hdr(&hdr);
 153
 154                 data = g_gate_send(sendfd, &hdr, sizeof(hdr), MSG_NOSIGNAL);
 155                 g_gate_log(LOG_DEBUG, "Sent hdr packet.");
 156                 g_gate_swap2h_hdr(&hdr);
 157                 if (reconnect)
 158                         break;
 159                 if (data != sizeof(hdr)) {
 160                         g_gate_log(LOG_ERR, "Lost connection 1.");
 161                         reconnect = 1;
 162                         pthread_kill(recvtd, SIGUSR1);
 163                         break;
 164                 }
 165
 166                 if (hdr.gh_cmd == GGATE_CMD_WRITE) {
 167                         data = g_gate_send(sendfd, ggio.gctl_data,
 168                             ggio.gctl_length, MSG_NOSIGNAL);
 169                         if (reconnect)
 170                                 break;
 171                         if (data != ggio.gctl_length) {
 172                                 g_gate_log(LOG_ERR, "Lost connection 2 (%zd != %zd).", data, (ssize_t)ggio.gctl_length);
 173                                 reconnect = 1;
 174                                 pthread_kill(recvtd, SIGUSR1);
 175                                 break;
 176                         }
 177                         g_gate_log(LOG_DEBUG, "Sent %zd bytes (offset=%llu, "
 178                             "size=%u).", data, hdr.gh_offset, hdr.gh_length);
 179                 }
 180         }
 181         g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
 182         return (NULL);
 183 }
 184
 185 static void *
 186 recv_thread(void *arg __unused)
 187 {
 188         struct g_gate_ctl_io ggio;
 189         struct g_gate_hdr hdr;
 190         char buf[MAXPHYS];
 191         ssize_t data;
 192
 193         g_gate_log(LOG_NOTICE, "%s: started!", __func__);
 194
 195         ggio.gctl_version = G_GATE_VERSION;
 196         ggio.gctl_unit = unit;
 197         ggio.gctl_data = buf;
 198
 199         for (;;) {
 200                 data = g_gate_recv(recvfd, &hdr, sizeof(hdr), MSG_WAITALL);
 201                 if (reconnect)
 202                         break;
 203                 g_gate_swap2h_hdr(&hdr);
 204                 if (data != sizeof(hdr)) {
 205                         if (data == -1 && errno == EAGAIN)
 206                                 continue;
 207                         g_gate_log(LOG_ERR, "Lost connection 3.");
 208                         reconnect = 1;
 209                         pthread_kill(sendtd, SIGUSR1);
 210                         break;
 211                 }
 212                 g_gate_log(LOG_DEBUG, "Received hdr packet.");
 213
 214                 ggio.gctl_seq = hdr.gh_seq;
 215                 ggio.gctl_cmd = hdr.gh_cmd;
 216                 ggio.gctl_offset = hdr.gh_offset;
 217                 ggio.gctl_length = hdr.gh_length;
 218                 ggio.gctl_error = hdr.gh_error;
 219
 220                 if (ggio.gctl_error == 0 && ggio.gctl_cmd == GGATE_CMD_READ) {
 221                         data = g_gate_recv(recvfd, ggio.gctl_data,
 222                             ggio.gctl_length, MSG_WAITALL);
 223                         if (reconnect)
 224                                 break;
 225                         g_gate_log(LOG_DEBUG, "Received data packet.");
 226                         if (data != ggio.gctl_length) {
 227                                 g_gate_log(LOG_ERR, "Lost connection 4.");
 228                                 reconnect = 1;
 229                                 pthread_kill(sendtd, SIGUSR1);
 230                                 break;
 231                         }
 232                         g_gate_log(LOG_DEBUG, "Received %d bytes (offset=%ju, "
 233                             "size=%zu).", data, (uintmax_t)hdr.gh_offset,
 234                             (size_t)hdr.gh_length);
 235                 }
 236
 237                 g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
 238         }
 239         g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
 240         pthread_exit(NULL);
 241 }
 242
 243 static int
 244 handshake(int dir)
 245 {
 246         struct g_gate_version ver;
 247         struct g_gate_cinit cinit;
 248         struct g_gate_sinit sinit;
 249         struct sockaddr_in serv;
 250         int sfd;
 251
 252         /*
 253          * Do the network stuff.
 254          */
 255         bzero(&serv, sizeof(serv));
 256         serv.sin_family = AF_INET;
 257         serv.sin_addr.s_addr = g_gate_str2ip(host);
 258         if (serv.sin_addr.s_addr == INADDR_NONE) {
 259                 g_gate_log(LOG_DEBUG, "Invalid IP/host name: %s.", host);
 260                 return (-1);
 261         }
 262         serv.sin_port = htons(port);
 263         sfd = socket(AF_INET, SOCK_STREAM, 0);
 264         if (sfd == -1) {
 265                 g_gate_log(LOG_DEBUG, "Cannot open socket: %s.",
 266                     strerror(errno));
 267                 return (-1);
 268         }
 269
 270         g_gate_socket_settings(sfd);
 271
 272         if (connect(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1) {
 273                 g_gate_log(LOG_DEBUG, "Cannot connect to server: %s.",
 274                     strerror(errno));
 275                 close(sfd);
 276                 return (-1);
 277         }
 278
 279         g_gate_log(LOG_INFO, "Connected to the server: %s:%d.", host, port);
 280
 281         /*
 282          * Create and send version packet.
 283          */
 284         g_gate_log(LOG_DEBUG, "Sending version packet.");
 285         assert(strlen(GGATE_MAGIC) == sizeof(ver.gv_magic));
 286         bcopy(GGATE_MAGIC, ver.gv_magic, sizeof(ver.gv_magic));
 287         ver.gv_version = GGATE_VERSION;
 288         ver.gv_error = 0;
 289         g_gate_swap2n_version(&ver);
 290         if (g_gate_send(sfd, &ver, sizeof(ver), MSG_NOSIGNAL) == -1) {
 291                 g_gate_log(LOG_DEBUG, "Error while sending version packet: %s.",
 292                     strerror(errno));
 293                 close(sfd);
 294                 return (-1);
 295         }
 296         bzero(&ver, sizeof(ver));
 297         if (g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL) == -1) {
 298                 g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
 299                     strerror(errno));
 300                 close(sfd);
 301                 return (-1);
 302         }
 303         if (ver.gv_error != 0) {
 304                 g_gate_log(LOG_DEBUG, "Version verification problem: %s.",
 305                     strerror(errno));
 306                 close(sfd);
 307                 return (-1);
 308         }
 309
 310         /*
 311          * Create and send initial packet.
 312          */
 313         g_gate_log(LOG_DEBUG, "Sending initial packet.");
 314         if (strlcpy(cinit.gc_path, path, sizeof(cinit.gc_path)) >=
 315             sizeof(cinit.gc_path)) {
 316                 g_gate_log(LOG_DEBUG, "Path name too long.");
 317                 close(sfd);
 318                 return (-1);
 319         }
 320         cinit.gc_flags = flags | dir;
 321         cinit.gc_token = token;
 322         cinit.gc_nconn = 2;
 323         g_gate_swap2n_cinit(&cinit);
 324         if (g_gate_send(sfd, &cinit, sizeof(cinit), MSG_NOSIGNAL) == -1) {
 325                 g_gate_log(LOG_DEBUG, "Error while sending initial packet: %s.",
 326                     strerror(errno));
 327                 close(sfd);
 328                 return (-1);
 329         }
 330         g_gate_swap2h_cinit(&cinit);
 331
 332         /*
 333          * Receiving initial packet from server.
 334          */
 335         g_gate_log(LOG_DEBUG, "Receiving initial packet.");
 336         if (g_gate_recv(sfd, &sinit, sizeof(sinit), MSG_WAITALL) == -1) {
 337                 g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
 338                     strerror(errno));
 339                 close(sfd);
 340                 return (-1);
 341         }
 342         g_gate_swap2h_sinit(&sinit);
 343         if (sinit.gs_error != 0) {
 344                 g_gate_log(LOG_DEBUG, "Error from server: %s.",
 345                     strerror(sinit.gs_error));
 346                 close(sfd);
 347                 return (-1);
 348         }
 349         g_gate_log(LOG_DEBUG, "Received initial packet.");
 350
 351         mediasize = sinit.gs_mediasize;
 352         if (sectorsize == 0)
 353                 sectorsize = sinit.gs_sectorsize;
 354
 355         return (sfd);
 356 }
 357
 358 static void
 359 mydaemon(void)
 360 {
 361
 362         if (g_gate_verbose > 0)
 363                 return;
 364         if (daemon(0, 0) == 0)
 365                 return;
 366         if (action == CREATE)
 367                 g_gate_destroy(unit, 1);
 368         err(EXIT_FAILURE, "Cannot daemonize");
 369 }
 370
 371 static int
 372 g_gatec_connect(void)
 373 {
 374
 375         token = arc4random();
 376         /*
 377          * Our receive descriptor is connected to the send descriptor on the
 378          * server side.
 379          */
 380         recvfd = handshake(GGATE_FLAG_SEND);
 381         if (recvfd == -1)
 382                 return (0);
 383         /*
 384          * Our send descriptor is connected to the receive descriptor on the
 385          * server side.
 386          */
 387         sendfd = handshake(GGATE_FLAG_RECV);
 388         if (sendfd == -1)
 389                 return (0);
 390         return (1);
 391 }
 392
 393 static void
 394 g_gatec_start(void)
 395 {
 396         int error;
 397
 398         reconnect = 0;
 399         error = pthread_create(&recvtd, NULL, recv_thread, NULL);
 400         if (error != 0) {
 401                 g_gate_destroy(unit, 1);
 402                 g_gate_xlog("pthread_create(recv_thread): %s.",
 403                     strerror(error));
 404         }
 405         sendtd = pthread_self();
 406         send_thread(NULL);
 407         /* Disconnected. */
 408         close(sendfd);
 409         close(recvfd);
 410 }
 411
 412 static void
 413 signop(int sig __unused)
 414 {
 415
 416         /* Do nothing. */
 417 }
 418
 419 static void
 420 g_gatec_loop(void)
 421 {
 422         struct g_gate_ctl_cancel ggioc;
 423
 424         signal(SIGUSR1, signop);
 425         for (;;) {
 426                 g_gatec_start();
 427                 g_gate_log(LOG_NOTICE, "Disconnected [%s %s]. Connecting...",
 428                     host, path);
 429                 while (!g_gatec_connect()) {
 430                         sleep(2);
 431                         g_gate_log(LOG_NOTICE, "Connecting [%s %s]...", host,
 432                             path);
 433                 }
 434                 ggioc.gctl_version = G_GATE_VERSION;
 435                 ggioc.gctl_unit = unit;
 436                 ggioc.gctl_seq = 0;
 437                 g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
 438         }
 439 }
 440
 441 static void
 442 g_gatec_create(void)
 443 {
 444         struct g_gate_ctl_create ggioc;
 445
 446         if (!g_gatec_connect())
 447                 g_gate_xlog("Cannot connect: %s.", strerror(errno));
 448
 449         /*
 450          * Ok, got both sockets, time to create provider.
 451          */
 452         memset(&ggioc, 0, sizeof(ggioc));
 453         ggioc.gctl_version = G_GATE_VERSION;
 454         ggioc.gctl_mediasize = mediasize;
 455         ggioc.gctl_sectorsize = sectorsize;
 456         ggioc.gctl_flags = flags;
 457         ggioc.gctl_maxcount = queue_size;
 458         ggioc.gctl_timeout = timeout;
 459         ggioc.gctl_unit = unit;
 460         snprintf(ggioc.gctl_info, sizeof(ggioc.gctl_info), "%s:%u %s", host,
 461             port, path);
 462         g_gate_ioctl(G_GATE_CMD_CREATE, &ggioc);
 463         if (unit == -1) {
 464                 printf("%s%u\n", G_GATE_PROVIDER_NAME, ggioc.gctl_unit);
 465                 fflush(stdout);
 466         }
 467         unit = ggioc.gctl_unit;
 468
 469         mydaemon();
 470         g_gatec_loop();
 471 }
 472
 473 static void
 474 g_gatec_rescue(void)
 475 {
 476         struct g_gate_ctl_cancel ggioc;
 477
 478         if (!g_gatec_connect())
 479                 g_gate_xlog("Cannot connect: %s.", strerror(errno));
 480
 481         ggioc.gctl_version = G_GATE_VERSION;
 482         ggioc.gctl_unit = unit;
 483         ggioc.gctl_seq = 0;
 484         g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
 485
 486         mydaemon();
 487         g_gatec_loop();
 488 }
 489
 490 int
 491 main(int argc, char *argv[])
 492 {
 493
 494         if (argc < 2)
 495                 usage();
 496         if (strcasecmp(argv[1], "create") == 0)
 497                 action = CREATE;
 498         else if (strcasecmp(argv[1], "destroy") == 0)
 499                 action = DESTROY;
 500         else if (strcasecmp(argv[1], "list") == 0)
 501                 action = LIST;
 502         else if (strcasecmp(argv[1], "rescue") == 0)
 503                 action = RESCUE;
 504         else
 505                 usage();
 506         argc -= 1;
 507         argv += 1;
 508         for (;;) {
 509                 int ch;
 510
 511                 ch = getopt(argc, argv, "fno:p:q:R:S:s:t:u:v");
 512                 if (ch == -1)
 513                         break;
 514                 switch (ch) {
 515                 case 'f':
 516                         if (action != DESTROY)
 517                                 usage();
 518                         force = 1;
 519                         break;
 520                 case 'n':
 521                         if (action != CREATE && action != RESCUE)
 522                                 usage();
 523                         nagle = 0;
 524                         break;
 525                 case 'o':
 526                         if (action != CREATE && action != RESCUE)
 527                                 usage();
 528                         if (strcasecmp("ro", optarg) == 0)
 529                                 flags = G_GATE_FLAG_READONLY;
 530                         else if (strcasecmp("wo", optarg) == 0)
 531                                 flags = G_GATE_FLAG_WRITEONLY;
 532                         else if (strcasecmp("rw", optarg) == 0)
 533                                 flags = 0;
 534                         else {
 535                                 errx(EXIT_FAILURE,
 536                                     "Invalid argument for '-o' option.");
 537                         }
 538                         break;
 539                 case 'p':
 540                         if (action != CREATE && action != RESCUE)
 541                                 usage();
 542                         errno = 0;
 543                         port = strtoul(optarg, NULL, 10);
 544                         if (port == 0 && errno != 0)
 545                                 errx(EXIT_FAILURE, "Invalid port.");
 546                         break;
 547                 case 'q':
 548                         if (action != CREATE)
 549                                 usage();
 550                         errno = 0;
 551                         queue_size = strtoul(optarg, NULL, 10);
 552                         if (queue_size == 0 && errno != 0)
 553                                 errx(EXIT_FAILURE, "Invalid queue_size.");
 554                         break;
 555                 case 'R':
 556                         if (action != CREATE && action != RESCUE)
 557                                 usage();
 558                         errno = 0;
 559                         rcvbuf = strtoul(optarg, NULL, 10);
 560                         if (rcvbuf == 0 && errno != 0)
 561                                 errx(EXIT_FAILURE, "Invalid rcvbuf.");
 562                         break;
 563                 case 'S':
 564                         if (action != CREATE && action != RESCUE)
 565                                 usage();
 566                         errno = 0;
 567                         sndbuf = strtoul(optarg, NULL, 10);
 568                         if (sndbuf == 0 && errno != 0)
 569                                 errx(EXIT_FAILURE, "Invalid sndbuf.");
 570                         break;
 571                 case 's':
 572                         if (action != CREATE)
 573                                 usage();
 574                         errno = 0;
 575                         sectorsize = strtoul(optarg, NULL, 10);
 576                         if (sectorsize == 0 && errno != 0)
 577                                 errx(EXIT_FAILURE, "Invalid sectorsize.");
 578                         break;
 579                 case 't':
 580                         if (action != CREATE)
 581                                 usage();
 582                         errno = 0;
 583                         timeout = strtoul(optarg, NULL, 10);
 584                         if (timeout == 0 && errno != 0)
 585                                 errx(EXIT_FAILURE, "Invalid timeout.");
 586                         break;
 587                 case 'u':
 588                         errno = 0;
 589                         unit = strtol(optarg, NULL, 10);
 590                         if (unit == 0 && errno != 0)
 591                                 errx(EXIT_FAILURE, "Invalid unit number.");
 592                         break;
 593                 case 'v':
 594                         if (action == DESTROY)
 595                                 usage();
 596                         g_gate_verbose++;
 597                         break;
 598                 default:
 599                         usage();
 600                 }
 601         }
 602         argc -= optind;
 603         argv += optind;
 604
 605         switch (action) {
 606         case CREATE:
 607                 if (argc != 2)
 608                         usage();
 609                 g_gate_load_module();
 610                 g_gate_open_device();
 611                 host = argv[0];
 612                 path = argv[1];
 613                 g_gatec_create();
 614                 break;
 615         case DESTROY:
 616                 if (unit == -1) {
 617                         fprintf(stderr, "Required unit number.\n");
 618                         usage();
 619                 }
 620                 g_gate_verbose = 1;
 621                 g_gate_open_device();
 622                 g_gate_destroy(unit, force);
 623                 break;
 624         case LIST:
 625                 g_gate_list(unit, g_gate_verbose);
 626                 break;
 627         case RESCUE:
 628                 if (argc != 2)
 629                         usage();
 630                 if (unit == -1) {
 631                         fprintf(stderr, "Required unit number.\n");
 632                         usage();
 633                 }
 634                 g_gate_open_device();
 635                 host = argv[0];
 636                 path = argv[1];
 637                 g_gatec_rescue();
 638                 break;
 639         case UNSET:
 640         default:
 641                 usage();
 642         }
 643         g_gate_close_device();
 644         exit(EXIT_SUCCESS);
 645 }