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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 | /* vi: set sw=4 ts=4: */ /* * Mini xargs implementation for busybox * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]" * * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru> * * Special thanks * - Mark Whitley and Glenn McGrath for stimulus to rewrite :) * - Mike Rendell <michael@cs.mun.ca> * and David MacKenzie <djm@gnu.ai.mit.edu>. * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. * * xargs is described in the Single Unix Specification v3 at * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html * */ #include "busybox.h" /* COMPAT: SYSV version defaults size (and has a max value of) to 470. We try to make it as large as possible. */ #if !defined(ARG_MAX) && defined(_SC_ARG_MAX) #define ARG_MAX sysconf (_SC_ARG_MAX) #endif #ifndef ARG_MAX #define ARG_MAX 470 #endif #ifdef TEST # ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION # define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION # endif # ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES # define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES # endif # ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT # define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT # endif # ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM # define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM # endif #endif /* This function has special algorithm. Don't use fork and include to main! */ static int xargs_exec(char *const *args) { pid_t p; volatile int exec_errno = 0; /* shared vfork stack */ int status; p = vfork(); if (p < 0) bb_perror_msg_and_die("vfork"); if (p == 0) { /* vfork -- child */ execvp(args[0], args); exec_errno = errno; /* set error to shared stack */ _exit(1); } /* vfork -- parent */ while (wait(&status) == (pid_t) -1) if (errno != EINTR) break; if (exec_errno) { errno = exec_errno; bb_perror_msg("%s", args[0]); return exec_errno == ENOENT ? 127 : 126; } if (WEXITSTATUS(status) == 255) { bb_error_msg("%s: exited with status 255; aborting", args[0]); return 124; } if (WIFSTOPPED(status)) { bb_error_msg("%s: stopped by signal %d", args[0], WSTOPSIG(status)); return 125; } if (WIFSIGNALED(status)) { bb_error_msg("%s: terminated by signal %d", args[0], WTERMSIG(status)); return 125; } if (WEXITSTATUS(status)) return 123; return 0; } typedef struct xlist_s { char *data; size_t lenght; struct xlist_s *link; } xlist_t; static int eof_stdin_detected; #define ISBLANK(c) ((c) == ' ' || (c) == '\t') #define ISSPACE(c) (ISBLANK(c) || (c) == '\n' || (c) == '\r' \ || (c) == '\f' || (c) == '\v') #ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES static xlist_t *process_stdin(xlist_t * list_arg, const char *eof_str, size_t mc, char *buf) { #define NORM 0 #define QUOTE 1 #define BACKSLASH 2 #define SPACE 4 char *s = NULL; /* start word */ char *p = NULL; /* pointer to end word */ char q = 0; /* quote char */ char state = NORM; char eof_str_detected = 0; size_t line_l = 0; /* size loaded args line */ int c; /* current char */ xlist_t *cur; xlist_t *prev; for (prev = cur = list_arg; cur; cur = cur->link) { line_l += cur->lenght; /* previous allocated */ if (prev != cur) prev = prev->link; } while (!eof_stdin_detected) { c = getchar(); if (c == EOF) { eof_stdin_detected++; if (s) goto unexpected_eof; break; } if (eof_str_detected) continue; if (state == BACKSLASH) { state = NORM; goto set; } else if (state == QUOTE) { if (c == q) { q = 0; state = NORM; } else { goto set; } } else { /* if(state == NORM) */ if (ISSPACE(c)) { if (s) { unexpected_eof: state = SPACE; c = 0; goto set; } } else { if (s == NULL) s = p = buf; if (c == '\\') { state = BACKSLASH; } else if (c == '\'' || c == '"') { q = c; state = QUOTE; } else { set: if ((size_t)(p - buf) >= mc) bb_error_msg_and_die("argument line too long"); *p++ = c; } } } if (state == SPACE) { /* word's delimiter or EOF detected */ if (q) { bb_error_msg_and_die("unmatched %s quote", q == '\'' ? "single" : "double"); } /* word loaded */ if (eof_str) { eof_str_detected = strcmp(s, eof_str) == 0; } if (!eof_str_detected) { size_t lenght = (p - buf); cur = xmalloc(sizeof(xlist_t) + lenght); cur->data = memcpy(cur + 1, s, lenght); cur->lenght = lenght; cur->link = NULL; if (prev == NULL) { list_arg = cur; } else { prev->link = cur; } prev = cur; line_l += lenght; if (line_l > mc) { /* stop memory usage :-) */ break; } } s = NULL; state = NORM; } } return list_arg; } #else /* The variant does not support single quotes, double quotes or backslash */ static xlist_t *process_stdin(xlist_t * list_arg, const char *eof_str, size_t mc, char *buf) { int c; /* current char */ int eof_str_detected = 0; char *s = NULL; /* start word */ char *p = NULL; /* pointer to end word */ size_t line_l = 0; /* size loaded args line */ xlist_t *cur; xlist_t *prev; for (prev = cur = list_arg; cur; cur = cur->link) { line_l += cur->lenght; /* previous allocated */ if (prev != cur) prev = prev->link; } while (!eof_stdin_detected) { c = getchar(); if (c == EOF) { eof_stdin_detected++; } if (eof_str_detected) continue; if (c == EOF || ISSPACE(c)) { if (s == NULL) continue; c = EOF; } if (s == NULL) s = p = buf; if ((p - buf) >= mc) bb_error_msg_and_die("argument line too long"); *p++ = c == EOF ? 0 : c; if (c == EOF) { /* word's delimiter or EOF detected */ /* word loaded */ if (eof_str) { eof_str_detected = strcmp(s, eof_str) == 0; } if (!eof_str_detected) { size_t lenght = (p - buf); cur = xmalloc(sizeof(xlist_t) + lenght); cur->data = memcpy(cur + 1, s, lenght); cur->lenght = lenght; cur->link = NULL; if (prev == NULL) { list_arg = cur; } else { prev->link = cur; } prev = cur; line_l += lenght; if (line_l > mc) { /* stop memory usage :-) */ break; } s = NULL; } } } return list_arg; } #endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */ #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION /* Prompt the user for a response, and if the user responds affirmatively, return true; otherwise, return false. Used "/dev/tty", not stdin. */ static int xargs_ask_confirmation(void) { static FILE *tty_stream; int c, savec; if (!tty_stream) { tty_stream = xfopen(CURRENT_TTY, "r"); /* pranoidal security by vodz */ fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC); } fputs(" ?...", stderr); fflush(stderr); c = savec = getc(tty_stream); while (c != EOF && c != '\n') c = getc(tty_stream); if (savec == 'y' || savec == 'Y') return 1; return 0; } #else # define xargs_ask_confirmation() 1 #endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */ #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED, size_t mc, char *buf) { int c; /* current char */ char *s = NULL; /* start word */ char *p = NULL; /* pointer to end word */ size_t line_l = 0; /* size loaded args line */ xlist_t *cur; xlist_t *prev; for (prev = cur = list_arg; cur; cur = cur->link) { line_l += cur->lenght; /* previous allocated */ if (prev != cur) prev = prev->link; } while (!eof_stdin_detected) { c = getchar(); if (c == EOF) { eof_stdin_detected++; if (s == NULL) break; c = 0; } if (s == NULL) s = p = buf; if ((size_t)(p - buf) >= mc) bb_error_msg_and_die("argument line too long"); *p++ = c; if (c == 0) { /* word's delimiter or EOF detected */ /* word loaded */ size_t lenght = (p - buf); cur = xmalloc(sizeof(xlist_t) + lenght); cur->data = memcpy(cur + 1, s, lenght); cur->lenght = lenght; cur->link = NULL; if (prev == NULL) { list_arg = cur; } else { prev->link = cur; } prev = cur; line_l += lenght; if (line_l > mc) { /* stop memory usage :-) */ break; } s = NULL; } } return list_arg; } #endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */ /* Correct regardless of combination of CONFIG_xxx */ enum { OPTBIT_VERBOSE = 0, OPTBIT_NO_EMPTY, OPTBIT_UPTO_NUMBER, OPTBIT_UPTO_SIZE, OPTBIT_EOF_STRING, USE_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,) USE_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,) USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,) OPT_VERBOSE = 1<<OPTBIT_VERBOSE , OPT_NO_EMPTY = 1<<OPTBIT_NO_EMPTY , OPT_UPTO_NUMBER = 1<<OPTBIT_UPTO_NUMBER, OPT_UPTO_SIZE = 1<<OPTBIT_UPTO_SIZE , OPT_EOF_STRING = 1<<OPTBIT_EOF_STRING , OPT_INTERACTIVE = USE_FEATURE_XARGS_SUPPORT_CONFIRMATION((1<<OPTBIT_INTERACTIVE)) + 0, OPT_TERMINATE = USE_FEATURE_XARGS_SUPPORT_TERMOPT( (1<<OPTBIT_TERMINATE )) + 0, OPT_ZEROTERM = USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1<<OPTBIT_ZEROTERM )) + 0, }; #define OPTION_STR "+trn:s:e::" \ USE_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \ USE_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \ USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0") int xargs_main(int argc, char **argv) { char **args; int i, n; xlist_t *list = NULL; xlist_t *cur; int child_error = 0; char *max_args, *max_chars; int n_max_arg; size_t n_chars = 0; long orig_arg_max; const char *eof_str = "_"; unsigned opt; size_t n_max_chars; #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM xlist_t* (*read_args)(xlist_t*, const char*, size_t, char*) = process_stdin; #else #define read_args process_stdin #endif opt = getopt32(argc, argv, OPTION_STR, &max_args, &max_chars, &eof_str); if (opt & OPT_ZEROTERM) USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin); argc -= optind; argv += optind; if (!argc) { /* default behavior is to echo all the filenames */ *argv = "echo"; argc++; } orig_arg_max = ARG_MAX; if (orig_arg_max == -1) orig_arg_max = LONG_MAX; orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048 */ if (opt & OPT_UPTO_SIZE) { n_max_chars = xatoul_range(max_chars, 1, orig_arg_max); for (i = 0; i < argc; i++) { n_chars += strlen(*argv) + 1; } if (n_max_chars < n_chars) { bb_error_msg_and_die("cannot fit single argument within argument list size limit"); } n_max_chars -= n_chars; } else { /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which have it at 1 meg). Things will work fine with a large ARG_MAX but it will probably hurt the system more than it needs to; an array of this size is allocated. */ if (orig_arg_max > 20 * 1024) orig_arg_max = 20 * 1024; n_max_chars = orig_arg_max; } max_chars = xmalloc(n_max_chars); if (opt & OPT_UPTO_NUMBER) { n_max_arg = xatoul_range(max_args, 1, INT_MAX); } else { n_max_arg = n_max_chars; } while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL || !(opt & OPT_NO_EMPTY)) { opt |= OPT_NO_EMPTY; n = 0; n_chars = 0; #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT for (cur = list; cur;) { n_chars += cur->lenght; n++; cur = cur->link; if (n_chars > n_max_chars || (n == n_max_arg && cur)) { if (opt & OPT_TERMINATE) bb_error_msg_and_die("argument list too long"); break; } } #else for (cur = list; cur; cur = cur->link) { n_chars += cur->lenght; n++; if (n_chars > n_max_chars || n == n_max_arg) { break; } } #endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */ /* allocate pointers for execvp: argc*arg, n*arg from stdin, NULL */ args = xzalloc((n + argc + 1) * sizeof(char *)); /* store the command to be executed (taken from the command line) */ for (i = 0; i < argc; i++) args[i] = argv[i]; /* (taken from stdin) */ for (cur = list; n; cur = cur->link) { args[i++] = cur->data; n--; } if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) { for (i = 0; args[i]; i++) { if (i) fputc(' ', stderr); fputs(args[i], stderr); } if (!(opt & OPT_INTERACTIVE)) fputc('\n', stderr); } if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) { child_error = xargs_exec(args); } /* clean up */ for (i = argc; args[i]; i++) { cur = list; list = list->link; free(cur); } free(args); if (child_error > 0 && child_error != 123) { break; } } if (ENABLE_FEATURE_CLEAN_UP) free(max_chars); return child_error; } #ifdef TEST const char *applet_name = "debug stuff usage"; void bb_show_usage(void) { fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n", applet_name); exit(1); } int main(int argc, char **argv) { return xargs_main(argc, argv); } #endif /* TEST */ |