src/ui.c

   1 /*
   2     Copyright (C) 2001-2013 Ben Kibbey <bjk@luxsci.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02110-1301  USA
  17 */
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <pwd.h>
  30 #include <time.h>
  31
  32 #ifdef HAVE_LIMITS_H
  33 #include <limits.h>
  34 #ifndef LINE_MAX
  35 #ifdef _POSIX2_LINE_MAX
  36 #define LINE_MAX _POSIX2_LINE_MAX
  37 #else
  38 #define LINE_MAX 2048
  39 #endif
  40 #endif
  41 #endif
  42
  43 #ifdef HAVE_GETOPT_H
  44 #include <getopt.h>
  45 #endif
  46
  47 #ifndef HAVE_ERR_H
  48 #include "err.c"
  49 #endif
  50
  51 #include "safe_strncat.c"
  52 #include "ui.h"
  53
  54 static void *Realloc(void *p, size_t size)
  55 {
  56     void *p2;
  57
  58     if ((p2 = realloc(p, size)) == NULL)
  59         err(EXIT_FAILURE, "%s", "realloc()");
  60
  61     return p2;
  62 }
  63
  64 /* This may be used in modules to keep a consistant time format with other
  65  * modules. */
  66 char *stamp(time_t epoch, const char *format)
  67 {
  68     static char buf[TIMEBUFSIZE];
  69     struct tm *t;
  70
  71     t = localtime(&epoch);
  72     strftime(buf, sizeof(buf), format, t);
  73     return buf;
  74 }
  75
  76 /*
  77  * This may be used in modules to add a string to the buffer (ui_module_exec()).
  78  */
  79 void add_string(char ***buf, const char *str)
  80 {
  81     char **s;
  82     int i = 0;
  83
  84     if (*buf) {
  85         for (s = *buf; *s; s++)
  86             i++;
  87     }
  88
  89     s = *buf;
  90     s = Realloc(s, (i + 2) * sizeof(char *));
  91     s[i++] = strdup(str);
  92     s[i] = NULL;
  93     *buf = s;
  94 }
  95
  96 /* This is for the field separators (-F and -m). */
  97 static int escapes(const char *str)
  98 {
  99     int c = 0;
 100
 101     if (str[0] != '\\')
 102         return str[0];
 103
 104     switch (*++str) {
 105         case 't':
 106             c = '\t';
 107             break;
 108         case 'n':
 109             c = '\n';
 110             break;
 111         case '\\':
 112             c = '\\';
 113             break;
 114         case 'v':
 115             c = '\v';
 116             break;
 117         case 'b':
 118             c = '\b';
 119             break;
 120         case 'f':
 121             c = '\f';
 122             break;
 123         case 'r':
 124             c = '\r';
 125             break;
 126         case '\'':
 127             c = '\'';
 128             break;
 129         default:
 130             c = 0;
 131             break;
 132     }
 133
 134     return c;
 135 }
 136
 137 /* Help text. Module help text is displayed after this. */
 138 static void usage_header()
 139 {
 140     printf("Usage: %s [-vhVL] [-c <filename>] [-t fmt] [-m c] [-F c] [-d]\n"
 141            "\t[[-xX] -O <module1> [options] [-- [-xX] -O <module2> [...]]]\n"
 142            "\t[- | username | -f filename] [...]\n\n", __progname);
 143 }
 144
 145 /* Help text. Module help text is displayed before this. */
 146 static void usage()
 147 {
 148     printf("  -d\tLoad the default modules (passwd.so, mail.so, and login.so).\n");
 149     printf("  -c\tRead a configuration file. Can be used more than once.\n");
 150     printf("  -O\tLoad a module. Can be used more than once.\n");
 151     printf("  -x\tChain module1's output to module2's input.\n");
 152     printf("  -X\tDon't output module1's info, only chain it.\n");
 153     printf("  -F c\tSeparate output with the specified character "
 154            "('%c').\n", delimchar);
 155     printf("  -m c\tSeparate multi-string values with the specified "
 156            "character ('%c').\n", multichar);
 157     printf("  -t tf\tstrftime(3) time format ('%s').\n", DEFAULT_TIMEFORMAT);
 158     printf("  -f\tUsers are the owners of the specified files.\n");
 159     printf("  -L\tFollow symbolic links.\n");
 160     printf("  -v\tVerbose output when possible (twice for all modules).\n");
 161     printf("  -h\tThis help text.\n");
 162     printf("  -V\tVersion information.\n\n");
 163     printf("Output key: %s=unknown/error, %s=none, %s=yes/on, "
 164            "%s=no/off\n", UNKNOWN, NONE, ON, OFF);
 165 }
 166
 167 /*
 168  * Add a module to the array of loaded modules. The index argument is the
 169  * current item number being added stored in an integer. The module is also
 170  * initialized here with ui_module_init().
 171  */
 172 static int open_module(char *filename, struct module_s **ptr)
 173 {
 174     void *m;
 175     module_init *init;
 176     char *p, s[PATH_MAX];
 177     int chainable = 0;
 178     struct module_s *mod, **mods, *last;
 179     int dup = 0;
 180
 181     strncpy(s, filename, sizeof(s));
 182
 183     if ((p = strrchr(s, '/')) != NULL)
 184         p++;
 185     else {
 186         strncpy(s, filename, sizeof(s));
 187         p = s;
 188     }
 189
 190     for (mods = modules; mods && *mods; mods++) {
 191         if (strcmp(p, (*mods)->name) == 0) {
 192             dup = 1;
 193             break;
 194         }
 195     }
 196
 197     if ((m = dlopen(filename, RTLD_NOW)) == NULL) {
 198         warnx("%s", dlerror());
 199         chaining = 0;
 200         chain_output = 1;
 201         return 1;
 202     }
 203
 204     last = modules ? modules[module_total-1] : NULL;
 205     modules = Realloc(modules, (module_total+2) * sizeof(struct module_s *));
 206     mod = calloc(1, sizeof(struct module_s));
 207     modules[module_total++] = mod;
 208     modules[module_total] = NULL;
 209     mod->m = m;
 210     strncpy(mod->name, p, sizeof(mod->name));
 211
 212     if ((init = dlsym(mod->m, "ui_module_init")) == NULL)
 213         warnx("%s", dlerror());
 214     else
 215         (*init) (&chainable);
 216
 217     if (chainable)
 218         SET_FLAG(mod->flags, MODULE_CHAINABLE);
 219
 220     if (last && TEST_FLAG(last->flags, MODULE_CHAINED) &&
 221             !TEST_FLAG(mod->flags, MODULE_CHAINABLE)) {
 222         warnx("%s: this module is not chainable", mod->name);
 223         module_total--;
 224         modules[module_total] = NULL;
 225         free(mod);
 226         return 1;
 227     }
 228
 229     /* Module chaining. See junction() for more info. */
 230     if (chaining)
 231         SET_FLAG(mod->flags, MODULE_CHAINED);
 232
 233     if (chain_output)
 234         SET_FLAG(mod->flags, MODULE_OUTPUT);
 235
 236     if (verbose)
 237         SET_FLAG(mod->flags, MODULE_VERBOSE);
 238
 239     if (dup) {
 240         SET_FLAG(mod->flags, MODULE_DUP);
 241         warnx("%s: a module by this name is already loaded", p);
 242     }
 243
 244     chaining = 0;
 245     chain_output = 1;
 246     verbose = (verbose < 2) ? 0 : 2;
 247     *ptr = mod;
 248     return 0;
 249 }
 250
 251 /* This just free's up the array of modules. The modules should clean up after
 252  * themselves via the ui_module_exit() function. */
 253 static void cleanup_modules()
 254 {
 255     struct module_s **mod;
 256
 257     if (!modules)
 258         return;
 259
 260     for (mod = modules; *mod; mod++) {
 261         module_exit *e;
 262         char **p;
 263
 264         if ((e = dlsym((*mod)->m, "ui_module_exit")) == NULL)
 265             warnx("%s", dlerror());
 266         else
 267             (*e)();
 268
 269         dlclose((*mod)->m);
 270
 271         if ((*mod)->argv) {
 272             for (p = (*mod)->argv; *p; p++)
 273                 free(*p);
 274
 275             free((*mod)->argv);
 276         }
 277
 278         free(*mod);
 279     }
 280
 281     free(modules);
 282 }
 283
 284 static void output(char **s, const int sep, int which)
 285 {
 286     char **p = s;
 287
 288     if (p) {
 289         for (; *p; p++) {
 290             printf("%s", *p);
 291
 292             if (*(p+1))
 293                 printf("%c", sep);
 294         }
 295     }
 296
 297     printf("%c", which == OUTPUT_DONE ? '\n' : sep);
 298 }
 299
 300 /* Pass the argument to each loaded module. */
 301 static int junction(const char *arg)
 302 {
 303     struct passwd *pw;
 304     struct stat st;
 305     int ret = EXIT_SUCCESS;
 306     char **s = NULL;
 307     struct module_s **mod;
 308
 309     if (usefile) {
 310         if ((STAT(arg, &st)) == -1) {
 311             warn("%s", arg);
 312             return EXIT_FAILURE;
 313         }
 314
 315         errno = 0;
 316
 317         if ((pw = getpwuid(st.st_uid)) == NULL) {
 318 #ifdef __NetBSD__
 319             warnx("%s: no such user", arg);
 320 #else
 321             if (errno == 0 || errno == ENOENT || errno == EPERM
 322                 || errno == EBADF || errno == ESRCH)
 323                 warnx("%s: no such uid %u", arg, st.st_uid);
 324             else
 325                 warn("%s", "getpwuid()");
 326 #endif
 327
 328             return EXIT_FAILURE;
 329         }
 330     }
 331     else {
 332         errno = 0;
 333
 334         if ((pw = getpwnam(arg)) == NULL) {
 335 #ifdef __NetBSD__
 336             warnx("%s: no such user", arg);
 337 #else
 338             if (errno == 0 || errno == ENOENT || errno == EPERM
 339                 || errno == EBADF || errno == ESRCH)
 340                 warnx("%s: no such user", arg);
 341             else
 342                 warn("%s", "getpwnam()");
 343 #endif
 344
 345             return EXIT_FAILURE;
 346         }
 347     }
 348
 349     for (mod = modules; *mod; mod++) {
 350         module_exec *m_exec;
 351
 352         if ((m_exec = dlsym((*mod)->m, "ui_module_exec")) == NULL) {
 353             warnx("%s", dlerror());
 354             continue;
 355         }
 356
 357         ret |= (*m_exec) (&s, pw, multichar,
 358                 TEST_FLAG((*mod)->flags, MODULE_VERBOSE), tf);
 359
 360         if (!TEST_FLAG((*mod)->flags, MODULE_CHAINED) ||
 361                 (TEST_FLAG((*mod)->flags, MODULE_CHAINED) &&
 362                  TEST_FLAG((*mod)->flags, MODULE_OUTPUT))) {
 363             output(s, delimchar,
 364                     (*(mod+1)) ? OUTPUT_APPEND : OUTPUT_DONE);
 365
 366             if (!TEST_FLAG((*mod)->flags, MODULE_CHAINED)) {
 367                 char **p;
 368
 369                 for (p = s; *p; p++) {
 370                     free(*p);
 371                 }
 372
 373                 free(s);
 374                 s = NULL;
 375             }
 376         }
 377     }
 378
 379     return ret;
 380 }
 381
 382 /* Copy options for each module into it's own argc and argv variables stopping
 383  * at -- (getopt(3)). */
 384 static int init_module_options(int the_argc, char **the_argv,
 385         struct module_s *mod)
 386 {
 387     char tmp[255];
 388     module_options *m;
 389     module_options_init *o;
 390     int old_optind = optind;
 391     int opt;
 392     int ret = EXIT_SUCCESS;
 393     char *optstring = NULL;
 394     char *defaults = NULL;
 395     int have_an_argument = 0;
 396
 397     if ((o = dlsym(mod->m, "ui_module_options_init")) == NULL) {
 398         warnx("%s", dlerror());
 399         return EXIT_FAILURE;
 400     }
 401
 402     if ((optstring = (*o) (&defaults))) {
 403         mod->argv = Realloc(mod->argv, (mod->argc + 2) * sizeof(char *));
 404         mod->argv[mod->argc++] = strdup(__progname);
 405         mod->argv[mod->argc] = NULL;
 406
 407         /* Probably a default module. */
 408         if (the_argv == NULL)
 409             goto blah;
 410
 411         while ((opt = getopt(the_argc, the_argv, optstring)) != -1) {
 412             switch (opt) {
 413                 case '?':
 414                     warnx("%s: invalid option -- %c\n", mod->name,
 415                           optopt);
 416                     return EXIT_FAILURE;
 417                 default:
 418                     break;
 419             }
 420
 421             mod->argv = Realloc(mod->argv, (mod->argc + 2) * sizeof(char *));
 422             snprintf(tmp, sizeof(tmp), "-%c%s", opt, (optarg) ? optarg : "");
 423             mod->argv[mod->argc++] = strdup(tmp);
 424             mod->argv[mod->argc] = NULL;
 425             have_an_argument = 1;
 426         }
 427     }
 428     else
 429         goto skip_option_stuff;
 430
 431 blah:
 432     /*
 433      * No options were specified for this module. Set the modules default
 434      * options (ui_module_options_init()) if any.
 435      */
 436     if (!have_an_argument && defaults) {
 437         mod->argv = Realloc(mod->argv, (mod->argc + 2) * sizeof(char *));
 438         snprintf(tmp, sizeof(tmp), "-%s", defaults);
 439         mod->argv[mod->argc++] = strdup(tmp);
 440         mod->argv[mod->argc] = NULL;
 441     }
 442
 443     old_optind = optind;
 444     opterr = optind = optopt = 1;
 445
 446     if ((m = dlsym(mod->m, "ui_module_options")) == NULL) {
 447         warnx("%s", dlerror());
 448         return EXIT_FAILURE;
 449     }
 450
 451     ret |= (*m) (mod->argc, mod->argv);
 452     optind = old_optind;
 453
 454 skip_option_stuff:
 455     return ret;
 456 }
 457
 458 /*
 459  * parseargs.c
 460  *
 461  * This will parse a line used as an argument list for the exec() line of
 462  * functions returning a dynamically allocated array of character pointers so
 463  * you should free() it afterwards. Both ' and " quoting is supported (with
 464  * escapes) for multi-word arguments.
 465  *
 466  * This is my second attempt at it. Works alot better than the first. :)
 467  *
 468  * 2002/10/05
 469  * Ben Kibbey <bjk@luxsci.net>
 470  *
 471  * 2004/11/07
 472  *     Modified to handle argv[0] and argc. (Ben Kibbey <bjk@luxsci.net>)
 473  */
 474 static char **parseargv(char *str, const char *progname, int *me_argc)
 475 {
 476     char **pptr, *s;
 477     char arg[LINE_MAX];
 478     int idx = 0;
 479     int quote = 0;
 480     int lastchar = 0;
 481     int i;
 482     int my_argc = 0;
 483
 484     if (!str)
 485         return NULL;
 486
 487     if (!(pptr = malloc(sizeof(char *))))
 488         return NULL;
 489
 490     pptr = Realloc(pptr, (idx + 2) * sizeof(char *));
 491     pptr[idx++] = strdup(progname);
 492     my_argc++;
 493
 494     for (i = 0, s = str; *s; lastchar = *s++) {
 495         if ((*s == '\"' || *s == '\'') && lastchar != '\\') {
 496             quote = (quote) ? 0 : 1;
 497             continue;
 498         }
 499
 500         if (*s == ' ' && !quote) {
 501             arg[i] = 0;
 502             pptr = Realloc(pptr, (idx + 2) * sizeof(char *));
 503             pptr[idx++] = strdup(arg);
 504             my_argc++;
 505             arg[0] = i = 0;
 506             continue;
 507         }
 508
 509         if ((i + 1) == sizeof(arg))
 510             continue;
 511
 512         arg[i++] = *s;
 513     }
 514
 515     arg[i] = 0;
 516
 517     if (arg[0]) {
 518         pptr = Realloc(pptr, (idx + 2) * sizeof(char *));
 519         pptr[idx++] = strdup(arg);
 520         my_argc++;
 521     }
 522
 523     pptr[idx] = NULL;
 524     *me_argc = my_argc;
 525     return pptr;
 526 }
 527
 528 static char *get_home_directory()
 529 {
 530     struct passwd *pw;
 531     static char dir[PATH_MAX];
 532
 533     errno = 0;
 534
 535     if ((pw = getpwuid(getuid())) == NULL) {
 536         if (errno)
 537             warn("getpwuid()");
 538         else
 539             warnx("getpwuid(): no such uid");
 540
 541         return NULL;
 542     }
 543
 544     strncpy(dir, pw->pw_dir, sizeof(dir));
 545     return dir;
 546 }
 547
 548 /* Read in a configuration file adding modules to the module array and
 549  * checking any module options. */
 550 static int parse_rc_file(const char *filename)
 551 {
 552     char line[LINE_MAX], *p;
 553     FILE *fp;
 554     int old_optind = optind;
 555     struct module_s *mod;
 556
 557     if ((fp = fopen(filename, "r")) == NULL) {
 558         warn("%s", filename);
 559         return 1;
 560     }
 561
 562     while ((p = fgets(line, sizeof(line), fp)) != NULL) {
 563         char name[PATH_MAX], options[LINE_MAX], tmp[PATH_MAX], *s;
 564         int my_argc;
 565         char **my_argv, **ap;
 566         int lastchar = '\0';
 567         int n;
 568
 569         while (*p && isspace((unsigned char) *p))
 570             p++;
 571
 572         if (*p == '#')
 573             continue;
 574
 575         s = name;
 576
 577         if (*p == '>' || *p == '-') {
 578             chaining = 1;
 579
 580             if (*p == '-')
 581                 chain_output = 0;
 582
 583             p++;
 584         }
 585
 586         while (*p && *p != ' ' && *p != '\t') {
 587             if (*p == '\n') {
 588                 p++;
 589                 break;
 590             }
 591
 592             *s++ = *p++;
 593         }
 594
 595         *s = '\0';
 596
 597         if (!name[0])
 598             continue;
 599
 600         s = options;
 601
 602         while (*p && isspace((unsigned char) *p))
 603             p++;
 604
 605         lastchar = *p;
 606
 607         while (*p) {
 608             if (*p == '\n' || (*p == '#' && lastchar != '\\'))
 609                 break;
 610
 611             if (*p == '#' && lastchar == '\\') {
 612                 lastchar = *--s = *p++;
 613                 s++;
 614                 continue;
 615             }
 616
 617             lastchar = *s++ = *p++;
 618         }
 619
 620         *s = '\0';
 621         p = name;
 622
 623         if (*p == '~') {
 624             s = get_home_directory();
 625             strncpy(tmp, s, sizeof(tmp));
 626             p++;
 627             safe_strncat(tmp, p, sizeof(tmp));
 628             strncpy(name, tmp, sizeof(name));
 629         }
 630
 631         if (open_module(name, &mod))
 632             continue;
 633
 634         if ((my_argv = parseargv(options, __progname, &my_argc)) == NULL)
 635             continue;
 636
 637         optind = 0;
 638         n = init_module_options(my_argc, my_argv, mod);
 639
 640         for (ap = my_argv; *ap; ap++)
 641             free(*ap);
 642
 643         free(my_argv);
 644
 645         if (n) {
 646             fclose(fp);
 647             return 2;
 648         }
 649
 650         optind = old_optind;
 651     }
 652
 653     fclose(fp);
 654     return 0;
 655 }
 656
 657 int main(int argc, char *argv[])
 658 {
 659     int ret = EXIT_SUCCESS;
 660     int opt;
 661     char line[LINE_MAX], *s = NULL;
 662     int want_help = 0;
 663
 664 #ifndef HAVE___PROGNAME
 665     __progname = argv[0];
 666 #endif
 667     delimchar = DEFAULT_DELIMINATING_CHAR;
 668     multichar = DEFAULT_MULTI_CHAR;
 669     strncpy(tf, DEFAULT_TIMEFORMAT, sizeof(tf));
 670     chain_output = 1;
 671
 672     while ((opt = getopt(argc, argv, "+x:X:dm:c:hO:F:t:vVLf")) != -1) {
 673         struct module_s *mod;
 674
 675         /*
 676          * See getopt(3).
 677          */
 678         opterr = 0;
 679
 680         switch (opt) {
 681             case 'd':
 682                 if (open_module("passwd.so", &mod) == 0) {
 683                     if (init_module_options(1, NULL, mod))
 684                         want_help = 1;
 685                 }
 686                 else {
 687                     ret = EXIT_FAILURE;
 688                     goto cleanup;
 689                 }
 690
 691                 if (open_module("mail.so", &mod) == 0) {
 692                     if (init_module_options(1, NULL, mod))
 693                         want_help = 1;
 694                 }
 695                 else {
 696                     ret = EXIT_FAILURE;
 697                     goto cleanup;
 698                 }
 699
 700                 if (open_module("login.so", &mod) == 0) {
 701                     if (init_module_options(1, NULL, mod))
 702                         want_help = 1;
 703                 }
 704                 else {
 705                     ret = EXIT_FAILURE;
 706                     goto cleanup;
 707                 }
 708
 709                 break;
 710             case 'm':
 711                 if ((optarg[0] != '\\' && strlen(optarg) > 1) ||
 712                     (optarg[0] == '\\' && strlen(optarg) != 2)) {
 713                     want_help = 1;
 714                     break;
 715                 }
 716
 717                 if ((multichar = escapes(optarg)) == 0)
 718                     want_help = 1;
 719
 720                 break;
 721             case 'c':
 722                 if ((ret = parse_rc_file(optarg)) != 0) {
 723                     if (ret == 2)
 724                         want_help = 1;
 725                     else
 726                         exit(EXIT_FAILURE);
 727                 }
 728                 break;
 729             case 'F':
 730                 if ((optarg[0] != '\\' && strlen(optarg) > 1) ||
 731                     (optarg[0] == '\\' && strlen(optarg) != 2)) {
 732                     want_help = 1;
 733                     break;
 734                 }
 735
 736                 if ((delimchar = escapes(optarg)) == 0)
 737                     want_help = 1;
 738
 739                 break;
 740             case 't':
 741                 strncpy(tf, optarg, sizeof(tf));
 742                 break;
 743             case 'V':
 744                 printf("%s\n%s\n", PACKAGE_STRING, COPYRIGHT);
 745                 exit(EXIT_SUCCESS);
 746                 break;
 747             case 'L':
 748                 followsymlinks = 1;
 749                 break;
 750             case 'f':
 751                 usefile = 1;
 752                 break;
 753             case 'v':
 754                 verbose++;
 755                 break;
 756             case 'X':
 757                 chain_output = 0;
 758             case 'x':
 759                 chaining = 1;
 760             case 'O':
 761                 if (open_module(optarg, &mod)) {
 762                     ret = EXIT_FAILURE;
 763                     goto cleanup;
 764                 }
 765
 766                 if (init_module_options(argc, argv, mod))
 767                     want_help = 1;
 768
 769                 /*
 770                  * For modules which have no options at all (to keep getopt
 771                  * from interpreting the rest as arguments.
 772                  */
 773                 if (optind < argc) {
 774                     if (strcmp(argv[optind], "--") == 0)
 775                         optind++;
 776                 }
 777
 778                 break;
 779             case 'h':
 780             default:
 781                 want_help = 1;
 782                 break;
 783         }
 784     }
 785
 786     /* The last module cannot be chained (syntax). */
 787     if (!module_total || TEST_FLAG(modules[module_total-1]->flags, MODULE_CHAINED))
 788         want_help = 1;
 789
 790     /* Cycle through the modules and output their help text. */
 791     if (want_help) {
 792         usage_header();
 793         struct module_s **mod;
 794
 795         for (mod = modules; mod && *mod; mod++) {
 796             module_help *m_help;
 797
 798             if (TEST_FLAG((*mod)->flags, MODULE_DUP))
 799                 continue;
 800
 801             if ((m_help = dlsym((*mod)->m, "ui_module_help")) == NULL) {
 802                 warnx("%s", dlerror());
 803                 continue;
 804             }
 805
 806             printf("%s\n", (*mod)->name);
 807             (*m_help) ();
 808         }
 809
 810         usage();
 811         cleanup_modules();
 812         exit(EXIT_FAILURE);
 813     }
 814
 815     if (argc == optind || strcmp(argv[optind], "-") == 0) {
 816         while ((s = fgets(line, sizeof(line), stdin)) != NULL) {
 817             if (s[strlen(s) - 1] == '\n')
 818                 s[strlen(s) - 1] = '\0';
 819
 820             ret |= junction(s);
 821         }
 822     }
 823     else {
 824         for (; optind < argc; optind++)
 825             ret |= junction(argv[optind]);
 826     }
 827
 828 cleanup:
 829     cleanup_modules();
 830     exit(ret);
 831 }