src/main/radmin.c

   1 /*
   2  * radmin.c     RADIUS Administration tool.
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * Copyright 2012   The FreeRADIUS server project
  21  * Copyright 2012   Alan DeKok <aland@deployingradius.com>
  22  */
  23
  24 RCSID("$Id$")
  25
  26 #include <freeradius-devel/radiusd.h>
  27 #include <freeradius-devel/md5.h>
  28
  29 #ifdef HAVE_SYS_UN_H
  30 #  include <sys/un.h>
  31 #  ifndef SUN_LEN
  32 #    define SUN_LEN(su)  (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
  33 #  endif
  34 #endif
  35
  36 #ifdef HAVE_GETOPT_H
  37 #  include <getopt.h>
  38 #endif
  39
  40 #ifdef HAVE_SYS_STAT_H
  41 #  include <sys/stat.h>
  42 #endif
  43
  44 #ifdef HAVE_LIBREADLINE
  45
  46 #if defined(HAVE_READLINE_READLINE_H)
  47 #  include <readline/readline.h>
  48 #  define USE_READLINE (1)
  49 #elif defined(HAVE_READLINE_H)
  50 #  include <readline.h>
  51 #  define USE_READLINE (1)
  52 #endif /* !defined(HAVE_READLINE_H) */
  53
  54 #ifdef HAVE_READLINE_HISTORY
  55 #  if defined(HAVE_READLINE_HISTORY_H)
  56 #    include <readline/history.h>
  57 #    define USE_READLINE_HISTORY (1)
  58 #  elif defined(HAVE_HISTORY_H)
  59 #    include <history.h>
  60 #    define USE_READLINE_HISTORY (1)
  61 #endif /* defined(HAVE_READLINE_HISTORY_H) */
  62
  63 #endif /* HAVE_READLINE_HISTORY */
  64
  65 #endif /* HAVE_LIBREADLINE */
  66
  67 /*
  68  *      For configuration file stuff.
  69  */
  70 char const *progname = "radmin";
  71 char const *radmin_version = "radmin version " RADIUSD_VERSION_STRING
  72 #ifdef RADIUSD_VERSION_COMMIT
  73 " (git #" STRINGIFY(RADIUSD_VERSION_COMMIT) ")"
  74 #endif
  75 ", built on " __DATE__ " at " __TIME__;
  76
  77
  78 /*
  79  *      The rest of this is because the conffile.c, etc. assume
  80  *      they're running inside of the server.  And we don't (yet)
  81  *      have a "libfreeradius-server", or "libfreeradius-util".
  82  */
  83 log_lvl_t debug_flag = 0;
  84 struct main_config_t main_config;
  85
  86 bool check_config = false;
  87
  88 static FILE *outputfp = NULL;
  89 static bool echo = false;
  90 static char const *secret = "testing123";
  91
  92 #include <sys/wait.h>
  93 pid_t rad_fork(void)
  94 {
  95         return fork();
  96 }
  97
  98 #ifdef HAVE_PTHREAD_H
  99 pid_t rad_waitpid(pid_t pid, int *status)
 100 {
 101         return waitpid(pid, status, 0);
 102 }
 103 #endif
 104
 105 static void NEVER_RETURNS usage(int status)
 106 {
 107         FILE *output = status ? stderr : stdout;
 108         fprintf(output, "Usage: %s [ args ]\n", progname);
 109         fprintf(output, "  -d raddb_dir    Configuration files are in \"raddbdir/*\".\n");
 110         fprintf(stderr, "  -D <dictdir>    Set main dictionary directory (defaults to " DICTDIR ").\n");
 111         fprintf(output, "  -e command      Execute 'command' and then exit.\n");
 112         fprintf(output, "  -E              Echo commands as they are being executed.\n");
 113         fprintf(output, "  -f socket_file  Open socket_file directly, without reading radius.conf\n");
 114         fprintf(output, "  -h              Print usage help information.\n");
 115         fprintf(output, "  -i input_file   Read commands from 'input_file'.\n");
 116         fprintf(output, "  -n name         Read raddb/name.conf instead of raddb/radiusd.conf\n");
 117         fprintf(output, "  -o output_file  Write commands to 'output_file'.\n");
 118         fprintf(output, "  -q              Quiet mode.\n");
 119
 120         exit(status);
 121 }
 122
 123 static int fr_domain_socket(char const *path)
 124 {
 125         int sockfd = -1;
 126 #ifdef HAVE_SYS_UN_H
 127         size_t len;
 128         socklen_t socklen;
 129         struct sockaddr_un saremote;
 130
 131         len = strlen(path);
 132         if (len >= sizeof(saremote.sun_path)) {
 133                 fprintf(stderr, "%s: Path too long in filename\n", progname);
 134                 return -1;
 135         }
 136
 137         if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
 138                 fprintf(stderr, "%s: Failed creating socket: %s\n",
 139                         progname, fr_syserror(errno));
 140                 return -1;
 141         }
 142
 143         saremote.sun_family = AF_UNIX;
 144         memcpy(saremote.sun_path, path, len + 1); /* SUN_LEN does strlen */
 145
 146         socklen = SUN_LEN(&saremote);
 147
 148         if (connect(sockfd, (struct sockaddr *)&saremote, socklen) < 0) {
 149                 struct stat buf;
 150
 151                 close(sockfd);
 152                 fprintf(stderr, "%s: Failed connecting to %s: %s\n",
 153                         progname, path, fr_syserror(errno));
 154
 155                 /*
 156                  *      The file doesn't exist.  Tell the user how to
 157                  *      fix it.
 158                  */
 159                 if ((stat(path, &buf) < 0) &&
 160                     (errno == ENOENT)) {
 161                         fprintf(stderr, "  Perhaps you need to run the commands:\n\tcd /etc/raddb\n\tln -s sites-available/control-socket sites-enabled/control-socket\n  and then re-start the server?\n");
 162                 }
 163
 164                 return -1;
 165         }
 166
 167 #ifdef O_NONBLOCK
 168         {
 169                 int flags;
 170
 171                 if ((flags = fcntl(sockfd, F_GETFL, NULL)) < 0)  {
 172                         fprintf(stderr, "%s: Failure getting socket flags: %s",
 173                                 progname, fr_syserror(errno));
 174                         close(sockfd);
 175                         return -1;
 176                 }
 177
 178                 flags |= O_NONBLOCK;
 179                 if( fcntl(sockfd, F_SETFL, flags) < 0) {
 180                         fprintf(stderr, "%s: Failure setting socket flags: %s",
 181                                 progname, fr_syserror(errno));
 182                         close(sockfd);
 183                         return -1;
 184                 }
 185         }
 186 #endif
 187 #endif
 188         return sockfd;
 189 }
 190
 191 static int client_socket(char const *server)
 192 {
 193         int sockfd;
 194         uint16_t port;
 195         fr_ipaddr_t ipaddr;
 196         char *p, buffer[1024];
 197
 198         strlcpy(buffer, server, sizeof(buffer));
 199
 200         p = strchr(buffer, ':');
 201         if (!p) {
 202                 port = PW_RADMIN_PORT;
 203         } else {
 204                 port = atoi(p + 1);
 205                 *p = '\0';
 206         }
 207
 208         if (ip_hton(&ipaddr, AF_INET, buffer, false) < 0) {
 209                 fprintf(stderr, "%s: Failed looking up host %s: %s\n",
 210                         progname, buffer, fr_syserror(errno));
 211                 exit(1);
 212         }
 213
 214         sockfd = fr_tcp_client_socket(NULL, &ipaddr, port);
 215         if (sockfd < 0) {
 216                 fprintf(stderr, "%s: Failed opening socket %s: %s\n",
 217                         progname, server, fr_syserror(errno));
 218                 exit(1);
 219         }
 220
 221         return sockfd;
 222 }
 223
 224 static void do_challenge(int sockfd)
 225 {
 226         size_t total;
 227         ssize_t r;
 228         uint8_t challenge[16];
 229
 230         for (total = 0; total < sizeof(challenge); ) {
 231                 r = read(sockfd, challenge + total, sizeof(challenge) - total);
 232                 if (r == 0) exit(1);
 233
 234                 if (r < 0) {
 235 #ifdef ECONNRESET
 236                         if (errno == ECONNRESET) {
 237                                 fprintf(stderr, "%s: Connection reset",
 238                                         progname);
 239                                 exit(1);
 240                         }
 241 #endif
 242                         if (errno == EINTR) continue;
 243
 244                         fprintf(stderr, "%s: Failed reading data: %s\n",
 245                                 progname, fr_syserror(errno));
 246                         exit(1);
 247                 }
 248                 total += r;
 249                 fflush(stdout);
 250         }
 251
 252         fr_hmac_md5(challenge, (uint8_t const *) secret, strlen(secret),
 253                     challenge, sizeof(challenge));
 254
 255         if (write(sockfd, challenge, sizeof(challenge)) < 0) {
 256                 fprintf(stderr, "%s: Failed writing challenge data: %s\n",
 257                         progname, fr_syserror(errno));
 258         }
 259 }
 260
 261 static ssize_t run_command(int sockfd, char const *command,
 262                            char *buffer, size_t bufsize)
 263 {
 264         char *p;
 265         ssize_t size, len;
 266
 267         if (echo) {
 268                 fprintf(outputfp, "%s\n", command);
 269         }
 270
 271         /*
 272          *      Write the text to the socket.
 273          */
 274         if (write(sockfd, command, strlen(command)) < 0) return -1;
 275         if (write(sockfd, "\r\n", 2) < 0) return -1;
 276
 277         /*
 278          *      Read the response
 279          */
 280         size = 0;
 281         buffer[0] = '\0';
 282
 283         memset(buffer, 0, bufsize);
 284
 285         while (1) {
 286                 int rcode;
 287                 fd_set readfds;
 288
 289                 FD_ZERO(&readfds);
 290                 FD_SET(sockfd, &readfds);
 291
 292                 rcode = select(sockfd + 1, &readfds, NULL, NULL, NULL);
 293                 if (rcode < 0) {
 294                         if (errno == EINTR) continue;
 295
 296                         fprintf(stderr, "%s: Failed selecting: %s\n",
 297                                 progname, fr_syserror(errno));
 298                         return -1;
 299                 }
 300
 301                 if (rcode == 0) {
 302                         fprintf(stderr, "%s: Server closed the connection.\n",
 303                                 progname);
 304                         return -1;
 305                 }
 306
 307 #ifdef MSG_DONTWAIT
 308                 len = recv(sockfd, buffer + size,
 309                            bufsize - size - 1, MSG_DONTWAIT);
 310 #else
 311                 /*
 312                  *      Read one byte at a time (ugh)
 313                  */
 314                 len = recv(sockfd, buffer + size, 1, 0);
 315 #endif
 316                 if (len < 0) {
 317                         /*
 318                          *      No data: keep looping
 319                          */
 320                         if ((errno == EAGAIN) || (errno == EINTR)) {
 321                                 continue;
 322                         }
 323
 324                         fprintf(stderr, "%s: Error reading socket: %s\n",
 325                                 progname, fr_syserror(errno));
 326                         return -1;
 327                 }
 328                 if (len == 0) return 0; /* clean exit */
 329
 330                 size += len;
 331                 buffer[size] = '\0';
 332
 333                 /*
 334                  *      There really is a better way of doing this.
 335                  */
 336                 p = strstr(buffer, "radmin> ");
 337                 if (p &&
 338                     ((p == buffer) ||
 339                      (p[-1] == '\n') ||
 340                      (p[-1] == '\r'))) {
 341                         *p = '\0';
 342
 343                         if (p[-1] == '\n') p[-1] = '\0';
 344                         break;
 345                 }
 346         }
 347
 348         /*
 349          *      Blank prompt.  Go get another command.
 350          */
 351         if (!buffer[0]) return 1;
 352
 353         buffer[size] = '\0'; /* this is at least right */
 354
 355         return 2;
 356 }
 357
 358 static int do_connect(int *out, char const *file, char const *server)
 359 {
 360         char buffer[65536];
 361         ssize_t len, size;
 362         int sockfd;
 363
 364         uint32_t magic, needed;
 365
 366         /*
 367          *      Close stale file descriptors
 368          */
 369         if (*out != -1) {
 370                 close(*out);
 371                 *out = -1;
 372         }
 373
 374         if (file) {
 375                 /*
 376                  *      FIXME: Get destination from command line, if possible?
 377                  */
 378                 sockfd = fr_domain_socket(file);
 379                 if (sockfd < 0) return -1;
 380         } else {
 381                 sockfd = client_socket(server);
 382         }
 383
 384         /*
 385          *      Only works for BSD, but Linux allows us
 386          *      to mask SIGPIPE, so that's fine.
 387          */
 388 #ifdef SO_NOSIGPIPE
 389         {
 390                 int set = 1;
 391
 392                 setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int));
 393         }
 394 #endif
 395
 396         /*
 397          *      Read initial magic && version information.
 398          */
 399         for (size = 0; size < 8; size += len) {
 400                 len = read(sockfd, buffer + size, 8 - size);
 401                 if (len < 0) {
 402                         fprintf(stderr, "%s: Error reading initial data from socket: %s\n",
 403                                 progname, fr_syserror(errno));
 404                         return -1;
 405                 }
 406         }
 407
 408         memcpy(&magic, buffer, 4);
 409         magic = ntohl(magic);
 410         if (magic != 0xf7eead15) {
 411                 fprintf(stderr, "%s: Socket %s is not FreeRADIUS administration socket\n", progname, file);
 412                 return -1;
 413         }
 414
 415         memcpy(&magic, buffer + 4, 4);
 416         magic = ntohl(magic);
 417
 418         if (!server) {
 419                 needed = 1;
 420         } else {
 421                 needed = 2;
 422         }
 423
 424         if (magic != needed) {
 425                 fprintf(stderr, "%s: Socket version mismatch: Need %d, got %d\n",
 426                         progname, needed, magic);
 427                 return -1;
 428         }
 429
 430         if (server && secret) do_challenge(sockfd);
 431
 432         *out = sockfd;
 433
 434         return 0;
 435 }
 436
 437 #define MAX_COMMANDS (4)
 438
 439 int main(int argc, char **argv)
 440 {
 441         int             argval;
 442         bool            quiet = false;
 443         bool            done_license = false;
 444         int             sockfd = -1;
 445         char            *line = NULL;
 446         ssize_t         len;
 447         char const      *file = NULL;
 448         char const      *name = "radiusd";
 449         char            *p, buffer[65536];
 450         char const      *input_file = NULL;
 451         FILE            *inputfp = stdin;
 452         char const      *output_file = NULL;
 453         char const      *server = NULL;
 454
 455         char const      *radius_dir = RADIUS_DIR;
 456         char const      *dict_dir = DICTDIR;
 457
 458         char *commands[MAX_COMMANDS];
 459         int num_commands = -1;
 460
 461 #ifndef NDEBUG
 462         if (fr_fault_setup(getenv("PANIC_ACTION"), argv[0]) < 0) {
 463                 fr_perror("radmin");
 464                 exit(EXIT_FAILURE);
 465         }
 466 #endif
 467
 468         talloc_set_log_stderr();
 469
 470         outputfp = stdout;      /* stdout is not a constant value... */
 471
 472         if ((progname = strrchr(argv[0], FR_DIR_SEP)) == NULL) {
 473                 progname = argv[0];
 474         } else {
 475                 progname++;
 476         }
 477
 478         while ((argval = getopt(argc, argv, "d:D:hi:e:Ef:n:o:qs:S")) != EOF) {
 479                 switch (argval) {
 480                 case 'd':
 481                         if (file) {
 482                                 fprintf(stderr, "%s: -d and -f cannot be used together.\n", progname);
 483                                 exit(1);
 484                         }
 485                         if (server) {
 486                                 fprintf(stderr, "%s: -d and -s cannot be used together.\n", progname);
 487                                 exit(1);
 488                         }
 489                         radius_dir = optarg;
 490                         break;
 491
 492                 case 'D':
 493                         dict_dir = optarg;
 494                         break;
 495
 496                 case 'e':
 497                         num_commands++; /* starts at -1 */
 498                         if (num_commands >= MAX_COMMANDS) {
 499                                 fprintf(stderr, "%s: Too many '-e'\n",
 500                                         progname);
 501                                 exit(1);
 502                         }
 503                         commands[num_commands] = optarg;
 504                         break;
 505
 506                 case 'E':
 507                         echo = true;
 508                         break;
 509
 510                 case 'f':
 511                         radius_dir = NULL;
 512                         file = optarg;
 513                         break;
 514
 515                 default:
 516                 case 'h':
 517                         usage(0);
 518                         break;
 519
 520                 case 'i':
 521                         if (strcmp(optarg, "-") != 0) {
 522                                 input_file = optarg;
 523                         }
 524                         quiet = true;
 525                         break;
 526
 527                 case 'n':
 528                         name = optarg;
 529                         break;
 530
 531                 case 'o':
 532                         if (strcmp(optarg, "-") != 0) {
 533                                 output_file = optarg;
 534                         }
 535                         quiet = true;
 536                         break;
 537
 538                 case 'q':
 539                         quiet = true;
 540                         break;
 541
 542                 case 's':
 543                         if (file) {
 544                                 fprintf(stderr, "%s: -s and -f cannot be used together.\n", progname);
 545                                 usage(1);
 546                         }
 547                         radius_dir = NULL;
 548                         server = optarg;
 549                         break;
 550
 551                 case 'S':
 552                         secret = NULL;
 553                         break;
 554                 }
 555         }
 556
 557         /*
 558          *      Mismatch between the binary and the libraries it depends on
 559          */
 560         if (fr_check_lib_magic(RADIUSD_MAGIC_NUMBER) < 0) {
 561                 fr_perror("radmin");
 562                 exit(1);
 563         }
 564
 565         if (radius_dir) {
 566                 int rcode;
 567                 CONF_SECTION *cs, *subcs;
 568
 569                 file = NULL;    /* MUST read it from the conffile now */
 570
 571                 snprintf(buffer, sizeof(buffer), "%s/%s.conf", radius_dir, name);
 572
 573                 /*
 574                  *      Need to read in the dictionaries, else we may get
 575                  *      validation errors when we try and parse the config.
 576                  */
 577                 if (dict_init(dict_dir, RADIUS_DICTIONARY) < 0) {
 578                         fr_perror("radmin");
 579                         exit(64);
 580                 }
 581
 582                 if (dict_read(radius_dir, RADIUS_DICTIONARY) == -1) {
 583                         fr_perror("radmin");
 584                         exit(64);
 585                 }
 586
 587                 cs = cf_file_read(buffer);
 588                 if (!cs) {
 589                         fprintf(stderr, "%s: Errors reading or parsing %s\n", progname, buffer);
 590                         usage(1);
 591                 }
 592
 593                 subcs = NULL;
 594                 while ((subcs = cf_subsection_find_next(cs, subcs, "listen")) != NULL) {
 595                         char const *value;
 596                         CONF_PAIR *cp = cf_pair_find(subcs, "type");
 597
 598                         if (!cp) continue;
 599
 600                         value = cf_pair_value(cp);
 601                         if (!value) continue;
 602
 603                         if (strcmp(value, "control") != 0) continue;
 604
 605                         /*
 606                          *      Now find the socket name (sigh)
 607                          */
 608                         rcode = cf_item_parse(subcs, "socket", FR_ITEM_POINTER(PW_TYPE_STRING, &file), NULL);
 609                         if (rcode < 0) {
 610                                 fprintf(stderr, "%s: Failed parsing listen section\n", progname);
 611                                 exit(1);
 612                         }
 613
 614                         if (!file) {
 615                                 fprintf(stderr, "%s: No path given for socket\n", progname);
 616                                 usage(1);
 617                         }
 618                         break;
 619                 }
 620
 621                 if (!file) {
 622                         fprintf(stderr, "%s: Could not find control socket in %s\n", progname, buffer);
 623                         exit(1);
 624                 }
 625         }
 626
 627         if (input_file) {
 628                 inputfp = fopen(input_file, "r");
 629                 if (!inputfp) {
 630                         fprintf(stderr, "%s: Failed opening %s: %s\n", progname, input_file, fr_syserror(errno));
 631                         exit(1);
 632                 }
 633         }
 634
 635         if (output_file) {
 636                 outputfp = fopen(output_file, "w");
 637                 if (!outputfp) {
 638                         fprintf(stderr, "%s: Failed creating %s: %s\n", progname, output_file, fr_syserror(errno));
 639                         exit(1);
 640                 }
 641         }
 642
 643         if (!file && !server) {
 644                 fprintf(stderr, "%s: Must use one of '-d' or '-f' or '-s'\n",
 645                         progname);
 646                 exit(1);
 647         }
 648
 649         /*
 650          *      Check if stdin is a TTY only if input is from stdin
 651          */
 652         if (input_file && !quiet && !isatty(STDIN_FILENO)) quiet = true;
 653
 654 #ifdef USE_READLINE
 655         if (!quiet) {
 656 #ifdef USE_READLINE_HISTORY
 657                 using_history();
 658 #endif
 659                 rl_bind_key('\t', rl_insert);
 660         }
 661 #endif
 662
 663         /*
 664          *      Prevent SIGPIPEs from terminating the process
 665          */
 666         signal(SIGPIPE, SIG_IGN);
 667
 668         if (do_connect(&sockfd, file, server) < 0) exit(1);
 669
 670         /*
 671          *      Run one command.
 672          */
 673         if (num_commands >= 0) {
 674                 int i;
 675
 676                 for (i = 0; i <= num_commands; i++) {
 677                         len = run_command(sockfd, commands[i], buffer, sizeof(buffer));
 678                         if (len < 0) exit(1);
 679
 680                         if (buffer[0]) {
 681                                 fputs(buffer, outputfp);
 682                                 fprintf(outputfp, "\n");
 683                                 fflush(outputfp);
 684                         }
 685                 }
 686                 exit(0);
 687         }
 688
 689         if (!done_license && !quiet) {
 690                 printf("%s - FreeRADIUS Server administration tool.\n", radmin_version);
 691                 printf("Copyright (C) 2008-2014 The FreeRADIUS server project and contributors.\n");
 692                 printf("There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n");
 693                 printf("PARTICULAR PURPOSE.\n");
 694                 printf("You may redistribute copies of FreeRADIUS under the terms of the\n");
 695                 printf("GNU General Public License v2.\n");
 696
 697                 done_license = true;
 698         }
 699
 700         /*
 701          *      FIXME: Do login?
 702          */
 703
 704         while (1) {
 705 #ifndef USE_READLINE
 706                 if (!quiet) {
 707                         printf("radmin> ");
 708                         fflush(stdout);
 709                 }
 710 #else
 711                 if (!quiet) {
 712                         line = readline("radmin> ");
 713
 714                         if (!line) break;
 715
 716                         if (!*line) {
 717                                 free(line);
 718                                 continue;
 719                         }
 720
 721 #ifdef USE_READLINE_HISTORY
 722                         add_history(line);
 723 #endif
 724                 } else          /* quiet, or no readline */
 725 #endif
 726                 {
 727                         line = fgets(buffer, sizeof(buffer), inputfp);
 728                         if (!line) break;
 729
 730                         p = strchr(buffer, '\n');
 731                         if (!p) {
 732                                 fprintf(stderr, "%s: Input line too long\n",
 733                                         progname);
 734                                 exit(1);
 735                         }
 736
 737                         *p = '\0';
 738
 739                         /*
 740                          *      Strip off leading spaces.
 741                          */
 742                         for (p = line; *p != '\0'; p++) {
 743                                 if ((p[0] == ' ') ||
 744                                     (p[0] == '\t')) {
 745                                         line = p + 1;
 746                                         continue;
 747                                 }
 748
 749                                 if (p[0] == '#') {
 750                                         line = NULL;
 751                                         break;
 752                                 }
 753
 754                                 break;
 755                         }
 756
 757                         /*
 758                          *      Comments: keep going.
 759                          */
 760                         if (!line) continue;
 761
 762                         /*
 763                          *      Strip off CR / LF
 764                          */
 765                         for (p = line; *p != '\0'; p++) {
 766                                 if ((p[0] == '\r') ||
 767                                     (p[0] == '\n')) {
 768                                         p[0] = '\0';
 769                                         break;
 770                                 }
 771                         }
 772                 }
 773
 774                 if (strcmp(line, "reconnect") == 0) {
 775                         if (do_connect(&sockfd, file, server) < 0) exit(1);
 776                         line = NULL;
 777                         continue;
 778                 }
 779
 780                 if (memcmp(line, "secret ", 7) == 0) {
 781                         if (!secret) {
 782                                 secret = line + 7;
 783                                 do_challenge(sockfd);
 784                         }
 785                         line = NULL;
 786                         continue;
 787                 }
 788
 789                 /*
 790                  *      Exit, done, etc.
 791                  */
 792                 if ((strcmp(line, "exit") == 0) ||
 793                     (strcmp(line, "quit") == 0)) {
 794                         break;
 795                 }
 796
 797                 if (server && !secret) {
 798                         fprintf(stderr, "ERROR: You must enter 'secret <SECRET>' before running any commands\n");
 799                         line = NULL;
 800                         continue;
 801                 }
 802
 803                 len = run_command(sockfd, line, buffer, sizeof(buffer));
 804                 if ((len < 0) && (do_connect(&sockfd, file, server) < 0)) {
 805                         fprintf(stderr, "Reconnecting...");
 806                         exit(1);
 807                 } else if (len == 0) break;
 808                 else if (len == 1) continue; /* no output. */
 809
 810                 fputs(buffer, outputfp);
 811                 fflush(outputfp);
 812                 fprintf(outputfp, "\n");
 813         }
 814
 815         fprintf(outputfp, "\n");
 816
 817         return 0;
 818 }
 819