busybox.c

   1 /* vi: set sw=4 ts=4: */
   2 #include "internal.h"
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <errno.h>
   6
   7 static int been_there_done_that = 0;
   8
   9 /* It has been alledged that doing such things can
  10  * help reduce binary size when staticly linking,
  11  * of course with glibc, this is unlikely as long
  12  * as we use things like printf -- perhaps a printf
  13  * replacement may be in order
  14  */
  15 #if 0
  16 void exit(int status) __attribute__ ((noreturn));
  17 void exit(int status)
  18 {
  19         _exit(status);
  20 };
  21 void abort(void) __attribute__ ((__noreturn__));
  22 void abort(void)
  23 {
  24         _exit(0);
  25 };
  26 int atexit(void (*__func) (void))
  27 {
  28         _exit(0);
  29 };
  30 void *__libc_stack_end;
  31 #endif
  32
  33 const struct BB_applet applets[] = {
  34
  35 #ifdef BB_AR
  36         {"ar", ar_main, _BB_DIR_USR_BIN},
  37 #endif
  38 #ifdef BB_BASENAME
  39         {"basename", basename_main, _BB_DIR_USR_BIN},
  40 #endif
  41         {"busybox", busybox_main, _BB_DIR_BIN},
  42 #ifdef BB_BLOCK_DEVICE
  43         {"block_device", block_device_main, _BB_DIR_SBIN},
  44 #endif
  45 #ifdef BB_CAT
  46         {"cat", cat_main, _BB_DIR_BIN},
  47 #endif
  48 #ifdef BB_CHMOD_CHOWN_CHGRP
  49         {"chgrp", chmod_chown_chgrp_main, _BB_DIR_BIN},
  50 #endif
  51 #ifdef BB_CHMOD_CHOWN_CHGRP
  52         {"chmod", chmod_chown_chgrp_main, _BB_DIR_BIN},
  53 #endif
  54 #ifdef BB_CHMOD_CHOWN_CHGRP
  55         {"chown", chmod_chown_chgrp_main, _BB_DIR_BIN},
  56 #endif
  57 #ifdef BB_CHROOT
  58         {"chroot", chroot_main, _BB_DIR_SBIN},
  59 #endif
  60 #ifdef BB_CLEAR
  61         {"clear", clear_main, _BB_DIR_USR_BIN},
  62 #endif
  63 #ifdef BB_CHVT
  64         {"chvt", chvt_main, _BB_DIR_USR_BIN},
  65 #endif
  66 #ifdef BB_CP_MV
  67         {"cp", cp_mv_main, _BB_DIR_BIN},
  68 #endif
  69 #ifdef BB_CUT
  70         {"cut", cut_main, _BB_DIR_USR_BIN},
  71 #endif
  72 #ifdef BB_DATE
  73         {"date", date_main, _BB_DIR_BIN},
  74 #endif
  75 #ifdef BB_DC
  76         {"dc", dc_main, _BB_DIR_USR_BIN},
  77 #endif
  78 #ifdef BB_DD
  79         {"dd", dd_main, _BB_DIR_BIN},
  80 #endif
  81 #ifdef BB_DF
  82         {"df", df_main, _BB_DIR_BIN},
  83 #endif
  84 #ifdef BB_DIRNAME
  85         {"dirname", dirname_main, _BB_DIR_USR_BIN},
  86 #endif
  87 #ifdef BB_DMESG
  88         {"dmesg", dmesg_main, _BB_DIR_BIN},
  89 #endif
  90 #ifdef BB_DU
  91         {"du", du_main, _BB_DIR_BIN},
  92 #endif
  93 #ifdef BB_DUTMP
  94         {"dutmp", dutmp_main, _BB_DIR_USR_SBIN},
  95 #endif
  96 #ifdef BB_ECHO
  97         {"echo", echo_main, _BB_DIR_BIN},
  98 #endif
  99 #ifdef BB_TRUE_FALSE
 100         {"false", false_main, _BB_DIR_BIN},
 101 #endif
 102 #ifdef BB_FBSET
 103         {"fbset", fbset_main, _BB_DIR_USR_SBIN},
 104 #endif
 105 #ifdef BB_FDFLUSH
 106         {"fdflush", fdflush_main, _BB_DIR_BIN},
 107 #endif
 108 #ifdef BB_FIND
 109         {"find", find_main, _BB_DIR_USR_BIN},
 110 #endif
 111 #ifdef BB_FREE
 112         {"free", free_main, _BB_DIR_USR_BIN},
 113 #endif
 114 #ifdef BB_FREERAMDISK
 115         {"freeramdisk", freeramdisk_main, _BB_DIR_SBIN},
 116 #endif
 117 #ifdef BB_DEALLOCVT
 118         {"deallocvt", deallocvt_main, _BB_DIR_USR_BIN},
 119 #endif
 120 #ifdef BB_FSCK_MINIX
 121         {"fsck.minix", fsck_minix_main, _BB_DIR_SBIN},
 122 #endif
 123 #ifdef BB_GREP
 124         {"grep", grep_main, _BB_DIR_BIN},
 125 #endif
 126 #ifdef BB_GUNZIP
 127         {"gunzip", gunzip_main, _BB_DIR_BIN},
 128 #endif
 129 #ifdef BB_GZIP
 130         {"gzip", gzip_main, _BB_DIR_BIN},
 131 #endif
 132 #ifdef BB_HALT
 133         {"halt", halt_main, _BB_DIR_SBIN},
 134 #endif
 135 #ifdef BB_HEAD
 136         {"head", head_main, _BB_DIR_BIN},
 137 #endif
 138 #ifdef BB_HOSTID
 139         {"hostid", hostid_main, _BB_DIR_USR_BIN},
 140 #endif
 141 #ifdef BB_HOSTNAME
 142         {"hostname", hostname_main, _BB_DIR_BIN},
 143 #endif
 144 #ifdef BB_ID
 145         {"id", id_main, _BB_DIR_USR_BIN},
 146 #endif
 147 #ifdef BB_INIT
 148         {"init", init_main, _BB_DIR_SBIN},
 149 #endif
 150 #ifdef BB_INSMOD
 151         {"insmod", insmod_main, _BB_DIR_SBIN},
 152 #endif
 153 #ifdef BB_KILL
 154         {"kill", kill_main, _BB_DIR_BIN},
 155 #endif
 156 #ifdef BB_KILLALL
 157         {"killall", kill_main, _BB_DIR_USR_BIN},
 158 #endif
 159 #ifdef BB_LENGTH
 160         {"length", length_main, _BB_DIR_USR_BIN},
 161 #endif
 162 #ifdef BB_LINUXRC
 163         {"linuxrc", init_main, _BB_DIR_ROOT},
 164 #endif
 165 #ifdef BB_LN
 166         {"ln", ln_main, _BB_DIR_BIN},
 167 #endif
 168 #ifdef BB_LOADACM
 169         {"loadacm", loadacm_main, _BB_DIR_USR_BIN},
 170 #endif
 171 #ifdef BB_LOADFONT
 172         {"loadfont", loadfont_main, _BB_DIR_USR_BIN},
 173 #endif
 174 #ifdef BB_LOADKMAP
 175         {"loadkmap", loadkmap_main, _BB_DIR_SBIN},
 176 #endif
 177 #ifdef BB_LOGGER
 178         {"logger", logger_main, _BB_DIR_USR_BIN},
 179 #endif
 180 #ifdef BB_LOGNAME
 181         {"logname", logname_main, _BB_DIR_USR_BIN},
 182 #endif
 183 #ifdef BB_LS
 184         {"ls", ls_main, _BB_DIR_BIN},
 185 #endif
 186 #ifdef BB_LSMOD
 187         {"lsmod", lsmod_main, _BB_DIR_SBIN},
 188 #endif
 189 #ifdef BB_MAKEDEVS
 190         {"makedevs", makedevs_main, _BB_DIR_SBIN},
 191 #endif
 192 #ifdef BB_MD5SUM
 193         {"md5sum", md5sum_main, _BB_DIR_USR_BIN},
 194 #endif
 195 #ifdef BB_MKDIR
 196         {"mkdir", mkdir_main, _BB_DIR_BIN},
 197 #endif
 198 #ifdef BB_MKFIFO
 199         {"mkfifo", mkfifo_main, _BB_DIR_USR_BIN},
 200 #endif
 201 #ifdef BB_MKFS_MINIX
 202         {"mkfs.minix", mkfs_minix_main, _BB_DIR_SBIN},
 203 #endif
 204 #ifdef BB_MKNOD
 205         {"mknod", mknod_main, _BB_DIR_BIN},
 206 #endif
 207 #ifdef BB_MKSWAP
 208         {"mkswap", mkswap_main, _BB_DIR_SBIN},
 209 #endif
 210 #ifdef BB_MKTEMP
 211         {"mktemp", mktemp_main, _BB_DIR_BIN},
 212 #endif
 213 #ifdef BB_NC
 214         {"nc", nc_main, _BB_DIR_USR_BIN},
 215 #endif
 216 #ifdef BB_MORE
 217         {"more", more_main, _BB_DIR_BIN},
 218 #endif
 219 #ifdef BB_MOUNT
 220         {"mount", mount_main, _BB_DIR_BIN},
 221 #endif
 222 #ifdef BB_MT
 223         {"mt", mt_main, _BB_DIR_BIN},
 224 #endif
 225 #ifdef BB_CP_MV
 226         {"mv", cp_mv_main, _BB_DIR_BIN},
 227 #endif
 228 #ifdef BB_NSLOOKUP
 229         {"nslookup", nslookup_main, _BB_DIR_USR_BIN},
 230 #endif
 231 #ifdef BB_PING
 232         {"ping", ping_main, _BB_DIR_BIN},
 233 #endif
 234 #ifdef BB_POWEROFF
 235         {"poweroff", poweroff_main, _BB_DIR_SBIN},
 236 #endif
 237 #ifdef BB_PRINTF
 238         {"printf", printf_main, _BB_DIR_USR_BIN},
 239 #endif
 240 #ifdef BB_PS
 241         {"ps", ps_main, _BB_DIR_BIN},
 242 #endif
 243 #ifdef BB_PWD
 244         {"pwd", pwd_main, _BB_DIR_BIN},
 245 #endif
 246 #ifdef BB_REBOOT
 247         {"reboot", reboot_main, _BB_DIR_SBIN},
 248 #endif
 249 #ifdef BB_RM
 250         {"rm", rm_main, _BB_DIR_BIN},
 251 #endif
 252 #ifdef BB_RMDIR
 253         {"rmdir", rmdir_main, _BB_DIR_BIN},
 254 #endif
 255 #ifdef BB_RMMOD
 256         {"rmmod", rmmod_main, _BB_DIR_SBIN},
 257 #endif
 258 #ifdef BB_SED
 259         {"sed", sed_main, _BB_DIR_BIN},
 260 #endif
 261 #ifdef BB_SETKEYCODES
 262         {"setkeycodes", setkeycodes_main, _BB_DIR_USR_BIN},
 263 #endif
 264 #ifdef BB_SFDISK
 265         {"sfdisk", sfdisk_main, _BB_DIR_SBIN},
 266 #endif
 267 #ifdef BB_SH
 268         {"sh", shell_main, _BB_DIR_BIN},
 269 #endif
 270 #ifdef BB_SLEEP
 271         {"sleep", sleep_main, _BB_DIR_BIN},
 272 #endif
 273 #ifdef BB_SORT
 274         {"sort", sort_main, _BB_DIR_BIN},
 275 #endif
 276 #ifdef BB_SYNC
 277         {"sync", sync_main, _BB_DIR_BIN},
 278 #endif
 279 #ifdef BB_SYSLOGD
 280         {"syslogd", syslogd_main, _BB_DIR_SBIN},
 281 #endif
 282 #ifdef BB_SWAPONOFF
 283         {"swapon", swap_on_off_main, _BB_DIR_SBIN},
 284 #endif
 285 #ifdef BB_SWAPONOFF
 286         {"swapoff", swap_on_off_main, _BB_DIR_SBIN},
 287 #endif
 288 #ifdef BB_TAIL
 289         {"tail", tail_main, _BB_DIR_USR_BIN},
 290 #endif
 291 #ifdef BB_TAR
 292         {"tar", tar_main, _BB_DIR_BIN},
 293 #endif
 294 #ifdef BB_TELNET
 295         {"telnet", telnet_main, _BB_DIR_USR_BIN},
 296 #endif
 297 #ifdef BB_TEST
 298         {"test", test_main, _BB_DIR_USR_BIN},
 299 #endif
 300 #ifdef BB_TEE
 301         {"tee", tee_main, _BB_DIR_BIN},
 302 #endif
 303 #ifdef BB_TOUCH
 304         {"touch", touch_main, _BB_DIR_USR_BIN},
 305 #endif
 306 #ifdef BB_TR
 307         {"tr", tr_main, _BB_DIR_USR_BIN},
 308 #endif
 309 #ifdef BB_TRUE_FALSE
 310         {"true", true_main, _BB_DIR_BIN},
 311 #endif
 312 #ifdef BB_TTY
 313         {"tty", tty_main, _BB_DIR_USR_BIN},
 314 #endif
 315 #ifdef BB_UMOUNT
 316         {"umount", umount_main, _BB_DIR_BIN},
 317 #endif
 318 #ifdef BB_UNAME
 319         {"uname", uname_main, _BB_DIR_BIN},
 320 #endif
 321 #ifdef BB_UNIQ
 322         {"uniq", uniq_main, _BB_DIR_USR_BIN},
 323 #endif
 324 #ifdef BB_UPDATE
 325         {"update", update_main, _BB_DIR_SBIN},
 326 #endif
 327 #ifdef BB_UPTIME
 328         {"uptime", uptime_main, _BB_DIR_USR_BIN},
 329 #endif
 330 #ifdef BB_UUENCODE
 331         {"uuencode", uuencode_main, _BB_DIR_USR_BIN},
 332 #endif
 333 #ifdef BB_UUDECODE
 334         {"uudecode", uudecode_main, _BB_DIR_USR_BIN},
 335 #endif
 336 #ifdef BB_USLEEP
 337         {"usleep", usleep_main, _BB_DIR_BIN},
 338 #endif
 339 #ifdef BB_WC
 340         {"wc", wc_main, _BB_DIR_USR_BIN},
 341 #endif
 342 #ifdef BB_WHICH
 343         {"which", which_main, _BB_DIR_USR_BIN},
 344 #endif
 345 #ifdef BB_WHOAMI
 346         {"whoami", whoami_main, _BB_DIR_USR_BIN},
 347 #endif
 348 #ifdef BB_YES
 349         {"yes", yes_main, _BB_DIR_USR_BIN},
 350 #endif
 351 #ifdef BB_GUNZIP
 352         {"zcat", gunzip_main, _BB_DIR_BIN},
 353 #endif
 354 #ifdef BB_TEST
 355         {"[", test_main, _BB_DIR_USR_BIN},
 356 #endif
 357         {0}
 358 };
 359
 360
 361 #ifdef BB_FEATURE_INSTALLER
 362 /*
 363  * directory table
 364  *      this should be consistent w/ the enum, internal.h::Location,
 365  *      or else...
 366  */
 367 static char* install_dir[] = {
 368     "/",
 369     "/bin",
 370     "/sbin",
 371     "/usr/bin",
 372     "/usr/sbin",
 373         NULL
 374 };
 375
 376 /* abstract link() */
 377 typedef int (*__link_f)(const char *, const char *);
 378
 379 /*
 380  * Where in the filesystem is this busybox?
 381  * [return]
 382  *              malloc'd string w/ full pathname of busybox's location
 383  *              NULL on failure
 384  */
 385 static char *busybox_fullpath()
 386 {
 387         pid_t   pid;
 388         char    path[256];
 389         char    proc[256];
 390         int             len;
 391
 392         pid = getpid();
 393         sprintf(proc, "/proc/%d/exe", pid);
 394         len = readlink(proc, path, 256);
 395         if (len != -1) {
 396                 path[len] = 0;
 397         } else {
 398                 fprintf(stderr, "busybox : %s : %s\n", proc, strerror(errno));
 399                 return NULL;
 400         }
 401         return strdup(path);
 402 }
 403
 404 /* create (sym)links for each applet */
 405 static int install_links(const char *busybox, int use_symbolic_links)
 406 {
 407     __link_f Link = link;
 408
 409     char        command[256];
 410         int             i;
 411         int             rc = 0;
 412
 413         if (use_symbolic_links) Link = symlink;
 414
 415     for (i = 0; applets[i].name != NULL; i++) {
 416         sprintf (
 417                         command,
 418                         "%s/%s",
 419                         install_dir[applets[i].location],
 420                         applets[i].name
 421                 );
 422 #if 1
 423         rc |= Link(busybox, command);
 424 #else
 425         puts(command);
 426 #endif
 427                 if (rc) {
 428                         fprintf(stderr,"busybox : %s : %s\n", command, strerror(errno));
 429                 }
 430     }
 431         return rc;
 432 }
 433
 434 #if 0
 435 int uninstall_links() ?
 436 #endif
 437 #endif /* BB_FEATURE_INSTALLER */
 438
 439
 440 int main(int argc, char **argv)
 441 {
 442         char                            *s;
 443         char                            *name;
 444         const struct BB_applet  *a              = applets;
 445
 446 #ifdef BB_FEATURE_INSTALLER
 447         /*
 448          * This style of argument parsing doesn't scale well
 449          * in the event that busybox starts wanting more --options.
 450          * If someone has a cleaner approach, by all means implement it.
 451          */
 452         if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
 453                 int use_symbolic_links = 0;
 454                 int rc = 0;
 455                 char *busybox;
 456
 457                 /* to use symlinks, or not to use symlinks... */
 458                 if (argc > 2) {
 459                         if ((strcmp(argv[2], "-s") == 0)) {
 460                                 use_symbolic_links = 1;
 461                         }
 462                 }
 463
 464                 /* link */
 465                 busybox = busybox_fullpath();
 466                 if (busybox) {
 467                         install_links(busybox, use_symbolic_links);
 468                         free(busybox);
 469                 } else {
 470                         rc = 1;
 471                 }
 472                 return rc;
 473         }
 474 #endif /* BB_FEATURE_INSTALLER */
 475
 476         for (s = name = argv[0]; *s != '\0';) {
 477                 if (*s++ == '/')
 478                         name = s;
 479         }
 480
 481         *argv = name;
 482
 483         while (a->name != 0) {
 484                 if (strcmp(name, a->name) == 0) {
 485                         exit(((*(a->main)) (argc, argv)));
 486                 }
 487                 a++;
 488         }
 489         return(busybox_main(argc, argv));
 490 }
 491
 492
 493 int busybox_main(int argc, char **argv)
 494 {
 495         int col = 0;
 496
 497         argc--;
 498         argv++;
 499
 500         if (been_there_done_that == 1 || argc < 1) {
 501                 const struct BB_applet *a = applets;
 502
 503                 fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n"
 504                                 "Usage: busybox [function] [arguments]...\n"
 505                                 "   or: [function] [arguments]...\n\n"
 506                                 "\tBusyBox is a multi-call binary that combines many common Unix\n"
 507                                 "\tutilities into a single executable.  Most people will create a\n"
 508                                 "\tlink to busybox for each function they wish to use, and BusyBox\n"
 509                                 "\twill act like whatever it was invoked as.\n"
 510                                 "\nCurrently defined functions:\n", BB_VER, BB_BT);
 511
 512                 while (a->name != 0) {
 513                         col +=
 514                                 fprintf(stderr, "%s%s", ((col == 0) ? "\t" : ", "),
 515                                                 (a++)->name);
 516                         if (col > 60 && a->name != 0) {
 517                                 fprintf(stderr, ",\n");
 518                                 col = 0;
 519                         }
 520                 }
 521                 fprintf(stderr, "\n\n");
 522                 exit(-1);
 523         }
 524         /* If we've already been here once, exit now */
 525         been_there_done_that = 1;
 526         return (main(argc, argv));
 527 }
 528
 529 /*
 530 Local Variables:
 531 c-file-style: "linux"
 532 c-basic-offset: 4
 533 tab-width: 4
 534 End:
 535 */