| File: | src/usr.bin/file/file.c |
| Warning: | line 680, column 3 Value stored to 'stop' is never read |
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| 1 | /* $OpenBSD: file.c,v 1.69 2019/11/30 14:01:45 mestre Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER |
| 15 | * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
| 16 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <sys/ioctl.h> |
| 21 | #include <sys/mman.h> |
| 22 | #include <sys/queue.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/uio.h> |
| 26 | #include <sys/wait.h> |
| 27 | |
| 28 | #include <err.h> |
| 29 | #include <errno(*__errno()).h> |
| 30 | #include <fcntl.h> |
| 31 | #include <getopt.h> |
| 32 | #include <imsg.h> |
| 33 | #include <libgen.h> |
| 34 | #include <limits.h> |
| 35 | #include <pwd.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | #include <time.h> |
| 39 | #include <unistd.h> |
| 40 | |
| 41 | #include "file.h" |
| 42 | #include "magic.h" |
| 43 | #include "xmalloc.h" |
| 44 | |
| 45 | struct input_msg { |
| 46 | int idx; |
| 47 | |
| 48 | struct stat sb; |
| 49 | int error; |
| 50 | |
| 51 | char link_path[PATH_MAX1024]; |
| 52 | int link_error; |
| 53 | int link_target; |
| 54 | }; |
| 55 | |
| 56 | struct input_ack { |
| 57 | int idx; |
| 58 | }; |
| 59 | |
| 60 | struct input_file { |
| 61 | struct magic *m; |
| 62 | struct input_msg *msg; |
| 63 | |
| 64 | const char *path; |
| 65 | int fd; |
| 66 | |
| 67 | void *base; |
| 68 | size_t size; |
| 69 | int mapped; |
| 70 | char *result; |
| 71 | }; |
| 72 | |
| 73 | extern char *__progname; |
| 74 | |
| 75 | __dead__attribute__((__noreturn__)) void usage(void); |
| 76 | |
| 77 | static int prepare_message(struct input_msg *, int, const char *); |
| 78 | static void send_message(struct imsgbuf *, void *, size_t, int); |
| 79 | static int read_message(struct imsgbuf *, struct imsg *, pid_t); |
| 80 | |
| 81 | static void read_link(struct input_msg *, const char *); |
| 82 | |
| 83 | static __dead__attribute__((__noreturn__)) void child(int, pid_t, int, char **); |
| 84 | |
| 85 | static void test_file(struct input_file *, size_t); |
| 86 | |
| 87 | static int try_stat(struct input_file *); |
| 88 | static int try_empty(struct input_file *); |
| 89 | static int try_access(struct input_file *); |
| 90 | static int try_text(struct input_file *); |
| 91 | static int try_magic(struct input_file *); |
| 92 | static int try_unknown(struct input_file *); |
| 93 | |
| 94 | static int bflag; |
| 95 | static int cflag; |
| 96 | static int iflag; |
| 97 | static int Lflag; |
| 98 | static int sflag; |
| 99 | static int Wflag; |
| 100 | |
| 101 | static char *magicpath; |
| 102 | static FILE *magicfp; |
| 103 | |
| 104 | static struct option longopts[] = { |
| 105 | { "brief", no_argument0, NULL((void *)0), 'b' }, |
| 106 | { "dereference", no_argument0, NULL((void *)0), 'L' }, |
| 107 | { "mime", no_argument0, NULL((void *)0), 'i' }, |
| 108 | { "mime-type", no_argument0, NULL((void *)0), 'i' }, |
| 109 | { NULL((void *)0), 0, NULL((void *)0), 0 } |
| 110 | }; |
| 111 | |
| 112 | __dead__attribute__((__noreturn__)) void |
| 113 | usage(void) |
| 114 | { |
| 115 | fprintf(stderr(&__sF[2]), "usage: %s [-bchiLsW] file ...\n", __progname); |
| 116 | exit(1); |
| 117 | } |
| 118 | |
| 119 | int |
| 120 | main(int argc, char **argv) |
| 121 | { |
| 122 | int opt, pair[2], fd, idx; |
| 123 | char *home; |
| 124 | struct passwd *pw; |
| 125 | struct imsgbuf ibuf; |
| 126 | struct imsg imsg; |
| 127 | struct input_msg msg; |
| 128 | struct input_ack *ack; |
| 129 | pid_t pid, parent; |
| 130 | |
| 131 | tzset(); |
| 132 | |
| 133 | for (;;) { |
| 134 | opt = getopt_long(argc, argv, "bchiLsW", longopts, NULL((void *)0)); |
| 135 | if (opt == -1) |
| 136 | break; |
| 137 | switch (opt) { |
| 138 | case 'b': |
| 139 | bflag = 1; |
| 140 | break; |
| 141 | case 'c': |
| 142 | cflag = 1; |
| 143 | break; |
| 144 | case 'h': |
| 145 | Lflag = 0; |
| 146 | break; |
| 147 | case 'i': |
| 148 | iflag = 1; |
| 149 | break; |
| 150 | case 'L': |
| 151 | Lflag = 1; |
| 152 | break; |
| 153 | case 's': |
| 154 | sflag = 1; |
| 155 | break; |
| 156 | case 'W': |
| 157 | Wflag = 1; |
| 158 | break; |
| 159 | default: |
| 160 | usage(); |
| 161 | } |
| 162 | } |
| 163 | argc -= optind; |
| 164 | argv += optind; |
| 165 | if (cflag) { |
| 166 | if (argc != 0) |
| 167 | usage(); |
| 168 | } else if (argc == 0) |
| 169 | usage(); |
| 170 | |
| 171 | if (pledge("stdio rpath getpw recvfd sendfd id proc", NULL((void *)0)) == -1) |
| 172 | err(1, "pledge"); |
| 173 | |
| 174 | magicfp = NULL((void *)0); |
| 175 | if (geteuid() != 0 && !issetugid()) { |
| 176 | home = getenv("HOME"); |
| 177 | if (home == NULL((void *)0) || *home == '\0') { |
| 178 | pw = getpwuid(getuid()); |
| 179 | if (pw != NULL((void *)0)) |
| 180 | home = pw->pw_dir; |
| 181 | else |
| 182 | home = NULL((void *)0); |
| 183 | } |
| 184 | if (home != NULL((void *)0)) { |
| 185 | xasprintf(&magicpath, "%s/.magic", home); |
| 186 | magicfp = fopen(magicpath, "r"); |
| 187 | if (magicfp == NULL((void *)0)) |
| 188 | free(magicpath); |
| 189 | } |
| 190 | } |
| 191 | if (magicfp == NULL((void *)0)) { |
| 192 | magicpath = xstrdup("/etc/magic"); |
| 193 | magicfp = fopen(magicpath, "r"); |
| 194 | } |
| 195 | if (magicfp == NULL((void *)0)) |
| 196 | err(1, "%s", magicpath); |
| 197 | |
| 198 | parent = getpid(); |
| 199 | if (socketpair(AF_UNIX1, SOCK_STREAM1, PF_UNSPEC0, pair) != 0) |
| 200 | err(1, "socketpair"); |
| 201 | switch (pid = fork()) { |
| 202 | case -1: |
| 203 | err(1, "fork"); |
| 204 | case 0: |
| 205 | close(pair[0]); |
| 206 | child(pair[1], parent, argc, argv); |
| 207 | } |
| 208 | close(pair[1]); |
| 209 | |
| 210 | if (pledge("stdio rpath sendfd", NULL((void *)0)) == -1) |
| 211 | err(1, "pledge"); |
| 212 | |
| 213 | fclose(magicfp); |
| 214 | magicfp = NULL((void *)0); |
| 215 | |
| 216 | if (cflag) |
| 217 | goto wait_for_child; |
| 218 | |
| 219 | imsg_init(&ibuf, pair[0]); |
| 220 | for (idx = 0; idx < argc; idx++) { |
| 221 | fd = prepare_message(&msg, idx, argv[idx]); |
| 222 | send_message(&ibuf, &msg, sizeof msg, fd); |
| 223 | |
| 224 | if (read_message(&ibuf, &imsg, pid) == 0) |
| 225 | break; |
| 226 | if (imsg.hdr.len != IMSG_HEADER_SIZEsizeof(struct imsg_hdr) + sizeof *ack) |
| 227 | errx(1, "message too small"); |
| 228 | ack = imsg.data; |
| 229 | if (ack->idx != idx) |
| 230 | errx(1, "index not expected"); |
| 231 | imsg_free(&imsg); |
| 232 | } |
| 233 | |
| 234 | wait_for_child: |
| 235 | close(pair[0]); |
| 236 | while (wait(NULL((void *)0)) == -1 && errno(*__errno()) != ECHILD10) { |
| 237 | if (errno(*__errno()) != EINTR4) |
| 238 | err(1, "wait"); |
| 239 | } |
| 240 | _exit(0); /* let the child flush */ |
| 241 | } |
| 242 | |
| 243 | static int |
| 244 | prepare_message(struct input_msg *msg, int idx, const char *path) |
| 245 | { |
| 246 | int fd, mode, error; |
| 247 | |
| 248 | memset(msg, 0, sizeof *msg); |
| 249 | msg->idx = idx; |
| 250 | |
| 251 | if (strcmp(path, "-") == 0) { |
| 252 | if (fstat(STDIN_FILENO0, &msg->sb) == -1) { |
| 253 | msg->error = errno(*__errno()); |
| 254 | return (-1); |
| 255 | } |
| 256 | return (STDIN_FILENO0); |
| 257 | } |
| 258 | |
| 259 | if (Lflag) |
| 260 | error = stat(path, &msg->sb); |
| 261 | else |
| 262 | error = lstat(path, &msg->sb); |
| 263 | if (error == -1) { |
| 264 | msg->error = errno(*__errno()); |
| 265 | return (-1); |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * pledge(2) doesn't let us pass directory file descriptors around - |
| 270 | * but in fact we don't need them, so just don't open directories or |
| 271 | * symlinks (which could be to directories). |
| 272 | */ |
| 273 | mode = msg->sb.st_mode; |
| 274 | if (!S_ISDIR(mode)((mode & 0170000) == 0040000) && !S_ISLNK(mode)((mode & 0170000) == 0120000)) { |
| 275 | fd = open(path, O_RDONLY0x0000|O_NONBLOCK0x0004); |
| 276 | if (fd == -1 && (errno(*__errno()) == ENFILE23 || errno(*__errno()) == EMFILE24)) |
| 277 | err(1, "open"); |
| 278 | } else |
| 279 | fd = -1; |
| 280 | if (S_ISLNK(mode)((mode & 0170000) == 0120000)) |
| 281 | read_link(msg, path); |
| 282 | return (fd); |
| 283 | |
| 284 | } |
| 285 | |
| 286 | static void |
| 287 | send_message(struct imsgbuf *ibuf, void *msg, size_t msglen, int fd) |
| 288 | { |
| 289 | if (imsg_compose(ibuf, -1, -1, 0, fd, msg, msglen) != 1) |
| 290 | err(1, "imsg_compose"); |
| 291 | if (imsg_flush(ibuf) != 0) |
| 292 | err(1, "imsg_flush"); |
| 293 | } |
| 294 | |
| 295 | static int |
| 296 | read_message(struct imsgbuf *ibuf, struct imsg *imsg, pid_t from) |
| 297 | { |
| 298 | int n; |
| 299 | |
| 300 | while ((n = imsg_read(ibuf)) == -1 && errno(*__errno()) == EAGAIN35) |
| 301 | /* nothing */ ; |
| 302 | if (n == -1) |
| 303 | err(1, "imsg_read"); |
| 304 | if (n == 0) |
| 305 | return (0); |
| 306 | |
| 307 | if ((n = imsg_get(ibuf, imsg)) == -1) |
| 308 | err(1, "imsg_get"); |
| 309 | if (n == 0) |
| 310 | return (0); |
| 311 | |
| 312 | if ((pid_t)imsg->hdr.pid != from) |
| 313 | errx(1, "PIDs don't match"); |
| 314 | |
| 315 | return (n); |
| 316 | |
| 317 | } |
| 318 | |
| 319 | static void |
| 320 | read_link(struct input_msg *msg, const char *path) |
| 321 | { |
| 322 | struct stat sb; |
| 323 | char lpath[PATH_MAX1024]; |
| 324 | char *copy, *root; |
| 325 | int used; |
| 326 | ssize_t size; |
| 327 | |
| 328 | size = readlink(path, lpath, sizeof lpath - 1); |
| 329 | if (size == -1) { |
| 330 | msg->link_error = errno(*__errno()); |
| 331 | return; |
| 332 | } |
| 333 | lpath[size] = '\0'; |
| 334 | |
| 335 | if (*lpath == '/') |
| 336 | strlcpy(msg->link_path, lpath, sizeof msg->link_path); |
| 337 | else { |
| 338 | copy = xstrdup(path); |
| 339 | |
| 340 | root = dirname(copy); |
| 341 | if (*root == '\0' || strcmp(root, ".") == 0 || |
| 342 | strcmp (root, "/") == 0) |
| 343 | strlcpy(msg->link_path, lpath, sizeof msg->link_path); |
| 344 | else { |
| 345 | used = snprintf(msg->link_path, sizeof msg->link_path, |
| 346 | "%s/%s", root, lpath); |
| 347 | if (used < 0 || (size_t)used >= sizeof msg->link_path) { |
| 348 | msg->link_error = ENAMETOOLONG63; |
| 349 | free(copy); |
| 350 | return; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | free(copy); |
| 355 | } |
| 356 | |
| 357 | if (!Lflag && stat(path, &sb) == -1) |
| 358 | msg->link_target = errno(*__errno()); |
| 359 | } |
| 360 | |
| 361 | static __dead__attribute__((__noreturn__)) void |
| 362 | child(int fd, pid_t parent, int argc, char **argv) |
| 363 | { |
| 364 | struct passwd *pw; |
| 365 | struct magic *m; |
| 366 | struct imsgbuf ibuf; |
| 367 | struct imsg imsg; |
| 368 | struct input_msg *msg; |
| 369 | struct input_ack ack; |
| 370 | struct input_file inf; |
| 371 | int i, idx; |
| 372 | size_t len, width = 0; |
| 373 | |
| 374 | if (pledge("stdio getpw recvfd id", NULL((void *)0)) == -1) |
| 375 | err(1, "pledge"); |
| 376 | |
| 377 | if (geteuid() == 0) { |
| 378 | pw = getpwnam(FILE_USER"_file"); |
| 379 | if (pw == NULL((void *)0)) |
| 380 | errx(1, "unknown user %s", FILE_USER"_file"); |
| 381 | if (setgroups(1, &pw->pw_gid) != 0) |
| 382 | err(1, "setgroups"); |
| 383 | if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) |
| 384 | err(1, "setresgid"); |
| 385 | if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) != 0) |
| 386 | err(1, "setresuid"); |
| 387 | } |
| 388 | |
| 389 | if (pledge("stdio recvfd", NULL((void *)0)) == -1) |
| 390 | err(1, "pledge"); |
| 391 | |
| 392 | m = magic_load(magicfp, magicpath, cflag || Wflag); |
| 393 | if (cflag) { |
| 394 | magic_dump(m); |
| 395 | exit(0); |
| 396 | } |
| 397 | |
| 398 | for (i = 0; i < argc; i++) { |
| 399 | len = strlen(argv[i]) + 1; |
| 400 | if (len > width) |
| 401 | width = len; |
| 402 | } |
| 403 | |
| 404 | imsg_init(&ibuf, fd); |
| 405 | for (;;) { |
| 406 | if (read_message(&ibuf, &imsg, parent) == 0) |
| 407 | break; |
| 408 | if (imsg.hdr.len != IMSG_HEADER_SIZEsizeof(struct imsg_hdr) + sizeof *msg) |
| 409 | errx(1, "message too small"); |
| 410 | msg = imsg.data; |
| 411 | |
| 412 | idx = msg->idx; |
| 413 | if (idx < 0 || idx >= argc) |
| 414 | errx(1, "index out of range"); |
| 415 | |
| 416 | memset(&inf, 0, sizeof inf); |
| 417 | inf.m = m; |
| 418 | inf.msg = msg; |
| 419 | |
| 420 | inf.path = argv[idx]; |
| 421 | inf.fd = imsg.fd; |
| 422 | |
| 423 | test_file(&inf, width); |
| 424 | |
| 425 | if (imsg.fd != -1) |
| 426 | close(imsg.fd); |
| 427 | imsg_free(&imsg); |
| 428 | |
| 429 | ack.idx = idx; |
| 430 | send_message(&ibuf, &ack, sizeof ack, -1); |
| 431 | } |
| 432 | exit(0); |
| 433 | } |
| 434 | |
| 435 | static void * |
| 436 | fill_buffer(int fd, size_t size, size_t *used) |
| 437 | { |
| 438 | static void *buffer; |
| 439 | ssize_t got; |
| 440 | size_t left; |
| 441 | void *next; |
| 442 | |
| 443 | if (buffer == NULL((void *)0)) |
| 444 | buffer = xmalloc(FILE_READ_SIZE(256 * 1024)); |
| 445 | |
| 446 | next = buffer; |
| 447 | left = size; |
| 448 | while (left != 0) { |
| 449 | got = read(fd, next, left); |
| 450 | if (got == -1) { |
| 451 | if (errno(*__errno()) == EINTR4) |
| 452 | continue; |
| 453 | return (NULL((void *)0)); |
| 454 | } |
| 455 | if (got == 0) |
| 456 | break; |
| 457 | next = (char *)next + got; |
| 458 | left -= got; |
| 459 | } |
| 460 | *used = size - left; |
| 461 | return (buffer); |
| 462 | } |
| 463 | |
| 464 | static int |
| 465 | load_file(struct input_file *inf) |
| 466 | { |
| 467 | size_t used; |
| 468 | |
| 469 | if (inf->msg->sb.st_size == 0 && S_ISREG(inf->msg->sb.st_mode)((inf->msg->sb.st_mode & 0170000) == 0100000)) |
| 470 | return (0); /* empty file */ |
| 471 | if (inf->msg->sb.st_size == 0 || inf->msg->sb.st_size > FILE_READ_SIZE(256 * 1024)) |
| 472 | inf->size = FILE_READ_SIZE(256 * 1024); |
| 473 | else |
| 474 | inf->size = inf->msg->sb.st_size; |
| 475 | |
| 476 | if (!S_ISREG(inf->msg->sb.st_mode)((inf->msg->sb.st_mode & 0170000) == 0100000)) |
| 477 | goto try_read; |
| 478 | |
| 479 | inf->base = mmap(NULL((void *)0), inf->size, PROT_READ0x01, MAP_PRIVATE0x0002, inf->fd, 0); |
| 480 | if (inf->base == MAP_FAILED((void *)-1)) |
| 481 | goto try_read; |
| 482 | inf->mapped = 1; |
| 483 | return (0); |
| 484 | |
| 485 | try_read: |
| 486 | inf->base = fill_buffer(inf->fd, inf->size, &used); |
| 487 | if (inf->base == NULL((void *)0)) { |
| 488 | xasprintf(&inf->result, "cannot read '%s' (%s)", inf->path, |
| 489 | strerror(errno(*__errno()))); |
| 490 | return (1); |
| 491 | } |
| 492 | inf->size = used; |
| 493 | return (0); |
| 494 | } |
| 495 | |
| 496 | static int |
| 497 | try_stat(struct input_file *inf) |
| 498 | { |
| 499 | if (inf->msg->error != 0) { |
| 500 | xasprintf(&inf->result, "cannot stat '%s' (%s)", inf->path, |
| 501 | strerror(inf->msg->error)); |
| 502 | return (1); |
| 503 | } |
| 504 | if (sflag || strcmp(inf->path, "-") == 0) { |
| 505 | switch (inf->msg->sb.st_mode & S_IFMT0170000) { |
| 506 | case S_IFIFO0010000: |
| 507 | if (strcmp(inf->path, "-") != 0) |
| 508 | break; |
| 509 | case S_IFBLK0060000: |
| 510 | case S_IFCHR0020000: |
| 511 | case S_IFREG0100000: |
| 512 | return (0); |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | if (iflag && (inf->msg->sb.st_mode & S_IFMT0170000) != S_IFREG0100000) { |
| 517 | xasprintf(&inf->result, "application/x-not-regular-file"); |
| 518 | return (1); |
| 519 | } |
| 520 | |
| 521 | switch (inf->msg->sb.st_mode & S_IFMT0170000) { |
| 522 | case S_IFDIR0040000: |
| 523 | xasprintf(&inf->result, "directory"); |
| 524 | return (1); |
| 525 | case S_IFLNK0120000: |
| 526 | if (inf->msg->link_error != 0) { |
| 527 | xasprintf(&inf->result, "unreadable symlink '%s' (%s)", |
| 528 | inf->path, strerror(inf->msg->link_error)); |
| 529 | return (1); |
| 530 | } |
| 531 | if (inf->msg->link_target == ELOOP62) |
| 532 | xasprintf(&inf->result, "symbolic link in a loop"); |
| 533 | else if (inf->msg->link_target != 0) { |
| 534 | xasprintf(&inf->result, "broken symbolic link to '%s'", |
| 535 | inf->msg->link_path); |
| 536 | } else { |
| 537 | xasprintf(&inf->result, "symbolic link to '%s'", |
| 538 | inf->msg->link_path); |
| 539 | } |
| 540 | return (1); |
| 541 | case S_IFSOCK0140000: |
| 542 | xasprintf(&inf->result, "socket"); |
| 543 | return (1); |
| 544 | case S_IFBLK0060000: |
| 545 | xasprintf(&inf->result, "block special (%lu/%lu)", |
| 546 | (long)major(inf->msg->sb.st_rdev)(((unsigned)(inf->msg->sb.st_rdev) >> 8) & 0xff ), |
| 547 | (long)minor(inf->msg->sb.st_rdev)((unsigned)((inf->msg->sb.st_rdev) & 0xff) | (((inf ->msg->sb.st_rdev) & 0xffff0000) >> 8))); |
| 548 | return (1); |
| 549 | case S_IFCHR0020000: |
| 550 | xasprintf(&inf->result, "character special (%lu/%lu)", |
| 551 | (long)major(inf->msg->sb.st_rdev)(((unsigned)(inf->msg->sb.st_rdev) >> 8) & 0xff ), |
| 552 | (long)minor(inf->msg->sb.st_rdev)((unsigned)((inf->msg->sb.st_rdev) & 0xff) | (((inf ->msg->sb.st_rdev) & 0xffff0000) >> 8))); |
| 553 | return (1); |
| 554 | case S_IFIFO0010000: |
| 555 | xasprintf(&inf->result, "fifo (named pipe)"); |
| 556 | return (1); |
| 557 | } |
| 558 | return (0); |
| 559 | } |
| 560 | |
| 561 | static int |
| 562 | try_empty(struct input_file *inf) |
| 563 | { |
| 564 | if (inf->size != 0) |
| 565 | return (0); |
| 566 | |
| 567 | if (iflag) |
| 568 | xasprintf(&inf->result, "application/x-empty"); |
| 569 | else |
| 570 | xasprintf(&inf->result, "empty"); |
| 571 | return (1); |
| 572 | } |
| 573 | |
| 574 | static int |
| 575 | try_access(struct input_file *inf) |
| 576 | { |
| 577 | char tmp[256] = ""; |
| 578 | |
| 579 | if (inf->msg->sb.st_size == 0 && S_ISREG(inf->msg->sb.st_mode)((inf->msg->sb.st_mode & 0170000) == 0100000)) |
| 580 | return (0); /* empty file */ |
| 581 | if (inf->fd != -1) |
| 582 | return (0); |
| 583 | |
| 584 | if (inf->msg->sb.st_mode & (S_IWUSR0000200|S_IWGRP0000020|S_IWOTH0000002)) |
| 585 | strlcat(tmp, "writable, ", sizeof tmp); |
| 586 | if (inf->msg->sb.st_mode & (S_IXUSR0000100|S_IXGRP0000010|S_IXOTH0000001)) |
| 587 | strlcat(tmp, "executable, ", sizeof tmp); |
| 588 | if (S_ISREG(inf->msg->sb.st_mode)((inf->msg->sb.st_mode & 0170000) == 0100000)) |
| 589 | strlcat(tmp, "regular file, ", sizeof tmp); |
| 590 | strlcat(tmp, "no read permission", sizeof tmp); |
| 591 | |
| 592 | inf->result = xstrdup(tmp); |
| 593 | return (1); |
| 594 | } |
| 595 | |
| 596 | static int |
| 597 | try_text(struct input_file *inf) |
| 598 | { |
| 599 | const char *type, *s; |
| 600 | int flags; |
| 601 | |
| 602 | flags = MAGIC_TEST_TEXT0x1; |
| 603 | if (iflag) |
| 604 | flags |= MAGIC_TEST_MIME0x2; |
| 605 | |
| 606 | type = text_get_type(inf->base, inf->size); |
| 607 | if (type == NULL((void *)0)) |
| 608 | return (0); |
| 609 | |
| 610 | s = magic_test(inf->m, inf->base, inf->size, flags); |
| 611 | if (s != NULL((void *)0)) { |
| 612 | inf->result = xstrdup(s); |
| 613 | return (1); |
| 614 | } |
| 615 | |
| 616 | s = text_try_words(inf->base, inf->size, flags); |
| 617 | if (s != NULL((void *)0)) { |
| 618 | if (iflag) |
| 619 | inf->result = xstrdup(s); |
| 620 | else |
| 621 | xasprintf(&inf->result, "%s %s text", type, s); |
| 622 | return (1); |
| 623 | } |
| 624 | |
| 625 | if (iflag) |
| 626 | inf->result = xstrdup("text/plain"); |
| 627 | else |
| 628 | xasprintf(&inf->result, "%s text", type); |
| 629 | return (1); |
| 630 | } |
| 631 | |
| 632 | static int |
| 633 | try_magic(struct input_file *inf) |
| 634 | { |
| 635 | const char *s; |
| 636 | int flags; |
| 637 | |
| 638 | flags = 0; |
| 639 | if (iflag) |
| 640 | flags |= MAGIC_TEST_MIME0x2; |
| 641 | |
| 642 | s = magic_test(inf->m, inf->base, inf->size, flags); |
| 643 | if (s != NULL((void *)0)) { |
| 644 | inf->result = xstrdup(s); |
| 645 | return (1); |
| 646 | } |
| 647 | return (0); |
| 648 | } |
| 649 | |
| 650 | static int |
| 651 | try_unknown(struct input_file *inf) |
| 652 | { |
| 653 | if (iflag) |
| 654 | xasprintf(&inf->result, "application/octet-stream"); |
| 655 | else |
| 656 | xasprintf(&inf->result, "data"); |
| 657 | return (1); |
| 658 | } |
| 659 | |
| 660 | static void |
| 661 | test_file(struct input_file *inf, size_t width) |
| 662 | { |
| 663 | char *label; |
| 664 | int stop; |
| 665 | |
| 666 | stop = 0; |
| 667 | if (!stop) |
| 668 | stop = try_stat(inf); |
| 669 | if (!stop) |
| 670 | stop = try_access(inf); |
| 671 | if (!stop) |
| 672 | stop = load_file(inf); |
| 673 | if (!stop) |
| 674 | stop = try_empty(inf); |
| 675 | if (!stop) |
| 676 | stop = try_magic(inf); |
| 677 | if (!stop) |
| 678 | stop = try_text(inf); |
| 679 | if (!stop) |
| 680 | stop = try_unknown(inf); |
Value stored to 'stop' is never read | |
| 681 | |
| 682 | if (bflag) |
| 683 | printf("%s\n", inf->result); |
| 684 | else { |
| 685 | if (strcmp(inf->path, "-") == 0) |
| 686 | xasprintf(&label, "/dev/stdin:"); |
| 687 | else |
| 688 | xasprintf(&label, "%s:", inf->path); |
| 689 | printf("%-*s %s\n", (int)width, label, inf->result); |
| 690 | free(label); |
| 691 | } |
| 692 | free(inf->result); |
| 693 | |
| 694 | if (inf->mapped && inf->base != NULL((void *)0)) |
| 695 | munmap(inf->base, inf->size); |
| 696 | } |