stand/common/commands.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <stand.h>
  31 #include <string.h>
  32
  33 #include "bootstrap.h"
  34
  35 const char      *command_errmsg;
  36 /* XXX should have procedural interface for setting, size limit? */
  37 char            command_errbuf[COMMAND_ERRBUFSZ];
  38
  39 static int page_file(char *filename);
  40
  41 /*
  42  * Help is read from a formatted text file.
  43  *
  44  * Entries in the file are formatted as
  45
  46 # Ttopic [Ssubtopic] Ddescription
  47 help
  48 text
  49 here
  50 #
  51
  52  *
  53  * Note that for code simplicity's sake, the above format must be followed
  54  * exactly.
  55  *
  56  * Subtopic entries must immediately follow the topic (this is used to
  57  * produce the listing of subtopics).
  58  *
  59  * If no argument(s) are supplied by the user, the help for 'help' is displayed.
  60  */
  61 COMMAND_SET(help, "help", "detailed help", command_help);
  62
  63 static int
  64 help_getnext(int fd, char **topic, char **subtopic, char **desc)
  65 {
  66         char    line[81], *cp, *ep;
  67
  68         /* Make sure we provide sane values. */
  69         *topic = *subtopic = *desc = NULL;
  70         for (;;) {
  71                 if (fgetstr(line, 80, fd) < 0)
  72                         return (0);
  73
  74                 if (strlen(line) < 3 || line[0] != '#' || line[1] != ' ')
  75                         continue;
  76
  77                 cp = line + 2;
  78                 while (cp != NULL && *cp != 0) {
  79                         ep = strchr(cp, ' ');
  80                         if (*cp == 'T' && *topic == NULL) {
  81                                 if (ep != NULL)
  82                                         *ep++ = 0;
  83                                 *topic = strdup(cp + 1);
  84                         } else if (*cp == 'S' && *subtopic == NULL) {
  85                                 if (ep != NULL)
  86                                         *ep++ = 0;
  87                                 *subtopic = strdup(cp + 1);
  88                         } else if (*cp == 'D') {
  89                                 *desc = strdup(cp + 1);
  90                                 ep = NULL;
  91                         }
  92                         cp = ep;
  93                 }
  94                 if (*topic == NULL) {
  95                         free(*subtopic);
  96                         free(*desc);
  97                         *subtopic = *desc = NULL;
  98                         continue;
  99                 }
 100                 return (1);
 101         }
 102 }
 103
 104 static int
 105 help_emitsummary(char *topic, char *subtopic, char *desc)
 106 {
 107         int     i;
 108
 109         pager_output("    ");
 110         pager_output(topic);
 111         i = strlen(topic);
 112         if (subtopic != NULL) {
 113                 pager_output(" ");
 114                 pager_output(subtopic);
 115                 i += strlen(subtopic) + 1;
 116         }
 117         if (desc != NULL) {
 118                 do {
 119                         pager_output(" ");
 120                 } while (i++ < 30);
 121                 pager_output(desc);
 122         }
 123         return (pager_output("\n"));
 124 }
 125
 126
 127 static int
 128 command_help(int argc, char *argv[])
 129 {
 130         char    buf[81];        /* XXX buffer size? */
 131         int     hfd, matched, doindex;
 132         char    *topic, *subtopic, *t, *s, *d;
 133
 134         /* page the help text from our load path */
 135         snprintf(buf, sizeof(buf), "%s/boot/loader.help", getenv("loaddev"));
 136         if ((hfd = open(buf, O_RDONLY)) < 0) {
 137                 printf("Verbose help not available, "
 138                     "use '?' to list commands\n");
 139                 return (CMD_OK);
 140         }
 141
 142         /* pick up request from arguments */
 143         topic = subtopic = NULL;
 144         switch (argc) {
 145         case 3:
 146                 subtopic = strdup(argv[2]);
 147                 /* FALLTHROUGH */
 148         case 2:
 149                 topic = strdup(argv[1]);
 150                 break;
 151         case 1:
 152                 topic = strdup("help");
 153                 break;
 154         default:
 155                 command_errmsg = "usage is 'help <topic> [<subtopic>]";
 156                 close(hfd);
 157                 return(CMD_ERROR);
 158         }
 159
 160         /* magic "index" keyword */
 161         doindex = strcmp(topic, "index") == 0? 1 : 0;
 162         matched = doindex;
 163
 164         /* Scan the helpfile looking for help matching the request */
 165         pager_open();
 166         while (help_getnext(hfd, &t, &s, &d)) {
 167
 168                 if (doindex) {          /* dink around formatting */
 169                         if (help_emitsummary(t, s, d))
 170                                 break;
 171
 172                 } else if (strcmp(topic, t)) {
 173                         /* topic mismatch */
 174                         if (matched) {
 175                                 /* nothing more on this topic, stop scanning */
 176                                 break;
 177                         }
 178                 } else {
 179                         /* topic matched */
 180                         matched = 1;
 181                         if ((subtopic == NULL && s == NULL) ||
 182                             (subtopic != NULL && s != NULL &&
 183                             strcmp(subtopic, s) == 0)) {
 184                                 /* exact match, print text */
 185                                 while (fgetstr(buf, 80, hfd) >= 0 &&
 186                                     buf[0] != '#') {
 187                                         if (pager_output(buf))
 188                                                 break;
 189                                         if (pager_output("\n"))
 190                                                 break;
 191                                 }
 192                         } else if (subtopic == NULL && s != NULL) {
 193                                 /* topic match, list subtopics */
 194                                 if (help_emitsummary(t, s, d))
 195                                         break;
 196                         }
 197                 }
 198                 free(t);
 199                 free(s);
 200                 free(d);
 201                 t = s = d = NULL;
 202         }
 203         free(t);
 204         free(s);
 205         free(d);
 206         pager_close();
 207         close(hfd);
 208         if (!matched) {
 209                 snprintf(command_errbuf, sizeof(command_errbuf),
 210                     "no help available for '%s'", topic);
 211                 free(topic);
 212                 free(subtopic);
 213                 return (CMD_ERROR);
 214         }
 215         free(topic);
 216         free(subtopic);
 217         return (CMD_OK);
 218 }
 219
 220 COMMAND_SET(commandlist, "?", "list commands", command_commandlist);
 221
 222 /*
 223  * Please note: although we use the pager for the list of commands,
 224  * this routine is called from the ? FORTH function which then
 225  * unconditionally prints some commands. This will lead to anomalous
 226  * behavior. There's no 'pager_output' binding to FORTH to allow
 227  * things to work right, so I'm documenting the bug rather than
 228  * fixing it.
 229  */
 230 static int
 231 command_commandlist(int argc __unused, char *argv[] __unused)
 232 {
 233         struct bootblk_command  **cmdp;
 234         int     res;
 235         char    name[20];
 236
 237         res = 0;
 238         pager_open();
 239         res = pager_output("Available commands:\n");
 240         SET_FOREACH(cmdp, Xcommand_set) {
 241                 if (res)
 242                         break;
 243                 if ((*cmdp)->c_name != NULL && (*cmdp)->c_desc != NULL) {
 244                         snprintf(name, sizeof(name), "  %-15s  ",
 245                             (*cmdp)->c_name);
 246                         pager_output(name);
 247                         pager_output((*cmdp)->c_desc);
 248                         res = pager_output("\n");
 249                 }
 250         }
 251         pager_close();
 252         return (CMD_OK);
 253 }
 254
 255 /*
 256  * XXX set/show should become set/echo if we have variable
 257  * substitution happening.
 258  */
 259
 260 COMMAND_SET(show, "show", "show variable(s)", command_show);
 261
 262 static int
 263 command_show(int argc, char *argv[])
 264 {
 265         struct env_var  *ev;
 266         char            *cp;
 267
 268         if (argc < 2) {
 269                 /*
 270                  * With no arguments, print everything.
 271                  */
 272                 pager_open();
 273                 for (ev = environ; ev != NULL; ev = ev->ev_next) {
 274                         pager_output(ev->ev_name);
 275                         cp = getenv(ev->ev_name);
 276                         if (cp != NULL) {
 277                                 pager_output("=");
 278                                 pager_output(cp);
 279                         }
 280                         if (pager_output("\n"))
 281                                 break;
 282                 }
 283                 pager_close();
 284         } else {
 285                 if ((cp = getenv(argv[1])) != NULL) {
 286                         printf("%s\n", cp);
 287                 } else {
 288                         snprintf(command_errbuf, sizeof(command_errbuf),
 289                             "variable '%s' not found", argv[1]);
 290                         return (CMD_ERROR);
 291                 }
 292         }
 293         return (CMD_OK);
 294 }
 295
 296 COMMAND_SET(set, "set", "set a variable", command_set);
 297
 298 static int
 299 command_set(int argc, char *argv[])
 300 {
 301         int     err;
 302
 303         if (argc != 2) {
 304                 command_errmsg = "wrong number of arguments";
 305                 return (CMD_ERROR);
 306         } else {
 307 #ifdef LOADER_VERIEXEC
 308                 /*
 309                  * Impose restrictions if input is not verified
 310                  */
 311                 const char *restricted[] = {
 312                         "boot",
 313                         "init",
 314                         "loader.ve.",
 315                         "rootfs",
 316                         "secur",
 317                         "vfs.",
 318                         NULL,
 319                 };
 320                 const char **cp;
 321                 int ves;
 322
 323                 ves = ve_status_get(-1);
 324                 if (ves == VE_UNVERIFIED_OK) {
 325 #ifdef LOADER_VERIEXEC_TESTING
 326                         printf("Checking: %s\n", argv[1]);
 327 #endif
 328                         for (cp = restricted; *cp; cp++) {
 329                                 if (strncmp(argv[1], *cp, strlen(*cp)) == 0) {
 330                                         printf("Ignoring restricted variable: %s\n",
 331                                             argv[1]);
 332                                         return (CMD_OK);
 333                                 }
 334                         }
 335                 }
 336 #endif
 337                 if ((err = putenv(argv[1])) != 0) {
 338                         command_errmsg = strerror(err);
 339                         return (CMD_ERROR);
 340                 }
 341         }
 342         return (CMD_OK);
 343 }
 344
 345 COMMAND_SET(unset, "unset", "unset a variable", command_unset);
 346
 347 static int
 348 command_unset(int argc, char *argv[])
 349 {
 350         int     err;
 351
 352         if (argc != 2) {
 353                 command_errmsg = "wrong number of arguments";
 354                 return (CMD_ERROR);
 355         } else {
 356                 if ((err = unsetenv(argv[1])) != 0) {
 357                         command_errmsg = strerror(err);
 358                         return (CMD_ERROR);
 359                 }
 360         }
 361         return (CMD_OK);
 362 }
 363
 364 COMMAND_SET(echo, "echo", "echo arguments", command_echo);
 365
 366 static int
 367 command_echo(int argc, char *argv[])
 368 {
 369         char    *s;
 370         int     nl, ch;
 371
 372         nl = 0;
 373         optind = 1;
 374         optreset = 1;
 375         while ((ch = getopt(argc, argv, "n")) != -1) {
 376                 switch (ch) {
 377                 case 'n':
 378                         nl = 1;
 379                         break;
 380                 case '?':
 381                 default:
 382                         /* getopt has already reported an error */
 383                         return (CMD_OK);
 384                 }
 385         }
 386         argv += (optind);
 387         argc -= (optind);
 388
 389         s = unargv(argc, argv);
 390         if (s != NULL) {
 391                 printf("%s", s);
 392                 free(s);
 393         }
 394         if (!nl)
 395                 printf("\n");
 396         return (CMD_OK);
 397 }
 398
 399 /*
 400  * A passable emulation of the sh(1) command of the same name.
 401  */
 402
 403 COMMAND_SET(read, "read", "read input from the terminal", command_read);
 404
 405 static int
 406 command_read(int argc, char *argv[])
 407 {
 408         char    *prompt;
 409         int     timeout;
 410         time_t  when;
 411         char    *cp;
 412         char    *name;
 413         char    buf[256];               /* XXX size? */
 414         int     c;
 415
 416         timeout = -1;
 417         prompt = NULL;
 418         optind = 1;
 419         optreset = 1;
 420         while ((c = getopt(argc, argv, "p:t:")) != -1) {
 421                 switch (c) {
 422                 case 'p':
 423                         prompt = optarg;
 424                         break;
 425                 case 't':
 426                         timeout = strtol(optarg, &cp, 0);
 427                         if (cp == optarg) {
 428                                 snprintf(command_errbuf,
 429                                     sizeof(command_errbuf),
 430                                     "bad timeout '%s'", optarg);
 431                                 return (CMD_ERROR);
 432                         }
 433                         break;
 434                 default:
 435                         return (CMD_OK);
 436                 }
 437         }
 438
 439         argv += (optind);
 440         argc -= (optind);
 441         name = (argc > 0) ? argv[0]: NULL;
 442
 443         if (prompt != NULL)
 444                 printf("%s", prompt);
 445         if (timeout >= 0) {
 446                 when = time(NULL) + timeout;
 447                 while (!ischar())
 448                         if (time(NULL) >= when)
 449                                 return (CMD_OK); /* is timeout an error? */
 450         }
 451
 452         ngets(buf, sizeof(buf));
 453
 454         if (name != NULL)
 455                 setenv(name, buf, 1);
 456         return (CMD_OK);
 457 }
 458
 459 /*
 460  * File pager
 461  */
 462 COMMAND_SET(more, "more", "show contents of a file", command_more);
 463
 464 static int
 465 command_more(int argc, char *argv[])
 466 {
 467         int     i;
 468         int     res;
 469         char    line[80];
 470
 471         res = 0;
 472         pager_open();
 473         for (i = 1; (i < argc) && (res == 0); i++) {
 474                 snprintf(line, sizeof(line), "*** FILE %s BEGIN ***\n",
 475                     argv[i]);
 476                 if (pager_output(line))
 477                         break;
 478                 res = page_file(argv[i]);
 479                 if (!res) {
 480                         snprintf(line, sizeof(line), "*** FILE %s END ***\n",
 481                             argv[i]);
 482                         res = pager_output(line);
 483                 }
 484         }
 485         pager_close();
 486
 487         if (res == 0)
 488                 return (CMD_OK);
 489         else
 490                 return (CMD_ERROR);
 491 }
 492
 493 static int
 494 page_file(char *filename)
 495 {
 496         int result;
 497
 498         result = pager_file(filename);
 499
 500         if (result == -1) {
 501                 snprintf(command_errbuf, sizeof(command_errbuf),
 502                     "error showing %s", filename);
 503         }
 504
 505         return (result);
 506 }
 507
 508 /*
 509  * List all disk-like devices
 510  */
 511 COMMAND_SET(lsdev, "lsdev", "list all devices", command_lsdev);
 512
 513 static int
 514 command_lsdev(int argc, char *argv[])
 515 {
 516         int     verbose, ch, i;
 517         char    line[80];
 518
 519         verbose = 0;
 520         optind = 1;
 521         optreset = 1;
 522         while ((ch = getopt(argc, argv, "v")) != -1) {
 523                 switch (ch) {
 524                 case 'v':
 525                         verbose = 1;
 526                         break;
 527                 case '?':
 528                 default:
 529                         /* getopt has already reported an error */
 530                         return (CMD_OK);
 531                 }
 532         }
 533         argv += (optind);
 534         argc -= (optind);
 535
 536         pager_open();
 537         for (i = 0; devsw[i] != NULL; i++) {
 538                 if (devsw[i]->dv_print != NULL) {
 539                         if (devsw[i]->dv_print(verbose))
 540                                 break;
 541                 } else {
 542                         snprintf(line, sizeof(line), "%s: (unknown)\n",
 543                             devsw[i]->dv_name);
 544                         if (pager_output(line))
 545                                 break;
 546                 }
 547         }
 548         pager_close();
 549         return (CMD_OK);
 550 }