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