1 // SPDX-License-Identifier: GPL-2.0 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <sys/types.h> 5 #include <sys/stat.h> 6 #include <string.h> 7 #include <unistd.h> 8 #include <time.h> 9 #include <fcntl.h> 10 #include <errno.h> 11 #include <ctype.h> 12 #include <limits.h> 13 14 /* 15 * Original work by Jeff Garzik 16 * 17 * External file lists, symlink, pipe and fifo support by Thayne Harbaugh 18 * Hard link support by Luciano Rocha 19 */ 20 21 #define xstr(s) #s 22 #define str(s) xstr(s) 23 24 static unsigned int offset; 25 static unsigned int ino = 721; 26 static time_t default_mtime; 27 28 struct file_handler { 29 const char *type; 30 int (*handler)(const char *line); 31 }; 32 33 static void push_string(const char *name) 34 { 35 unsigned int name_len = strlen(name) + 1; 36 37 fputs(name, stdout); 38 putchar(0); 39 offset += name_len; 40 } 41 42 static void push_pad (void) 43 { 44 while (offset & 3) { 45 putchar(0); 46 offset++; 47 } 48 } 49 50 static void push_rest(const char *name) 51 { 52 unsigned int name_len = strlen(name) + 1; 53 unsigned int tmp_ofs; 54 55 fputs(name, stdout); 56 putchar(0); 57 offset += name_len; 58 59 tmp_ofs = name_len + 110; 60 while (tmp_ofs & 3) { 61 putchar(0); 62 offset++; 63 tmp_ofs++; 64 } 65 } 66 67 static void push_hdr(const char *s) 68 { 69 fputs(s, stdout); 70 offset += 110; 71 } 72 73 static void cpio_trailer(void) 74 { 75 char s[256]; 76 const char name[] = "TRAILER!!!"; 77 78 sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX" 79 "%08X%08X%08X%08X%08X%08X%08X", 80 "070701", /* magic */ 81 0, /* ino */ 82 0, /* mode */ 83 (long) 0, /* uid */ 84 (long) 0, /* gid */ 85 1, /* nlink */ 86 (long) 0, /* mtime */ 87 0, /* filesize */ 88 0, /* major */ 89 0, /* minor */ 90 0, /* rmajor */ 91 0, /* rminor */ 92 (unsigned)strlen(name)+1, /* namesize */ 93 0); /* chksum */ 94 push_hdr(s); 95 push_rest(name); 96 97 while (offset % 512) { 98 putchar(0); 99 offset++; 100 } 101 } 102 103 static int cpio_mkslink(const char *name, const char *target, 104 unsigned int mode, uid_t uid, gid_t gid) 105 { 106 char s[256]; 107 108 if (name[0] == '/') 109 name++; 110 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" 111 "%08X%08X%08X%08X%08X%08X%08X", 112 "070701", /* magic */ 113 ino++, /* ino */ 114 S_IFLNK | mode, /* mode */ 115 (long) uid, /* uid */ 116 (long) gid, /* gid */ 117 1, /* nlink */ 118 (long) default_mtime, /* mtime */ 119 (unsigned)strlen(target)+1, /* filesize */ 120 3, /* major */ 121 1, /* minor */ 122 0, /* rmajor */ 123 0, /* rminor */ 124 (unsigned)strlen(name) + 1,/* namesize */ 125 0); /* chksum */ 126 push_hdr(s); 127 push_string(name); 128 push_pad(); 129 push_string(target); 130 push_pad(); 131 return 0; 132 } 133 134 static int cpio_mkslink_line(const char *line) 135 { 136 char name[PATH_MAX + 1]; 137 char target[PATH_MAX + 1]; 138 unsigned int mode; 139 int uid; 140 int gid; 141 int rc = -1; 142 143 if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) { 144 fprintf(stderr, "Unrecognized dir format '%s'", line); 145 goto fail; 146 } 147 rc = cpio_mkslink(name, target, mode, uid, gid); 148 fail: 149 return rc; 150 } 151 152 static int cpio_mkgeneric(const char *name, unsigned int mode, 153 uid_t uid, gid_t gid) 154 { 155 char s[256]; 156 157 if (name[0] == '/') 158 name++; 159 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" 160 "%08X%08X%08X%08X%08X%08X%08X", 161 "070701", /* magic */ 162 ino++, /* ino */ 163 mode, /* mode */ 164 (long) uid, /* uid */ 165 (long) gid, /* gid */ 166 2, /* nlink */ 167 (long) default_mtime, /* mtime */ 168 0, /* filesize */ 169 3, /* major */ 170 1, /* minor */ 171 0, /* rmajor */ 172 0, /* rminor */ 173 (unsigned)strlen(name) + 1,/* namesize */ 174 0); /* chksum */ 175 push_hdr(s); 176 push_rest(name); 177 return 0; 178 } 179 180 enum generic_types { 181 GT_DIR, 182 GT_PIPE, 183 GT_SOCK 184 }; 185 186 struct generic_type { 187 const char *type; 188 mode_t mode; 189 }; 190 191 static const struct generic_type generic_type_table[] = { 192 [GT_DIR] = { 193 .type = "dir", 194 .mode = S_IFDIR 195 }, 196 [GT_PIPE] = { 197 .type = "pipe", 198 .mode = S_IFIFO 199 }, 200 [GT_SOCK] = { 201 .type = "sock", 202 .mode = S_IFSOCK 203 } 204 }; 205 206 static int cpio_mkgeneric_line(const char *line, enum generic_types gt) 207 { 208 char name[PATH_MAX + 1]; 209 unsigned int mode; 210 int uid; 211 int gid; 212 int rc = -1; 213 214 if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) { 215 fprintf(stderr, "Unrecognized %s format '%s'", 216 line, generic_type_table[gt].type); 217 goto fail; 218 } 219 mode |= generic_type_table[gt].mode; 220 rc = cpio_mkgeneric(name, mode, uid, gid); 221 fail: 222 return rc; 223 } 224 225 static int cpio_mkdir_line(const char *line) 226 { 227 return cpio_mkgeneric_line(line, GT_DIR); 228 } 229 230 static int cpio_mkpipe_line(const char *line) 231 { 232 return cpio_mkgeneric_line(line, GT_PIPE); 233 } 234 235 static int cpio_mksock_line(const char *line) 236 { 237 return cpio_mkgeneric_line(line, GT_SOCK); 238 } 239 240 static int cpio_mknod(const char *name, unsigned int mode, 241 uid_t uid, gid_t gid, char dev_type, 242 unsigned int maj, unsigned int min) 243 { 244 char s[256]; 245 246 if (dev_type == 'b') 247 mode |= S_IFBLK; 248 else 249 mode |= S_IFCHR; 250 251 if (name[0] == '/') 252 name++; 253 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" 254 "%08X%08X%08X%08X%08X%08X%08X", 255 "070701", /* magic */ 256 ino++, /* ino */ 257 mode, /* mode */ 258 (long) uid, /* uid */ 259 (long) gid, /* gid */ 260 1, /* nlink */ 261 (long) default_mtime, /* mtime */ 262 0, /* filesize */ 263 3, /* major */ 264 1, /* minor */ 265 maj, /* rmajor */ 266 min, /* rminor */ 267 (unsigned)strlen(name) + 1,/* namesize */ 268 0); /* chksum */ 269 push_hdr(s); 270 push_rest(name); 271 return 0; 272 } 273 274 static int cpio_mknod_line(const char *line) 275 { 276 char name[PATH_MAX + 1]; 277 unsigned int mode; 278 int uid; 279 int gid; 280 char dev_type; 281 unsigned int maj; 282 unsigned int min; 283 int rc = -1; 284 285 if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u", 286 name, &mode, &uid, &gid, &dev_type, &maj, &min)) { 287 fprintf(stderr, "Unrecognized nod format '%s'", line); 288 goto fail; 289 } 290 rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min); 291 fail: 292 return rc; 293 } 294 295 static int cpio_mkfile(const char *name, const char *location, 296 unsigned int mode, uid_t uid, gid_t gid, 297 unsigned int nlinks) 298 { 299 char s[256]; 300 char *filebuf = NULL; 301 struct stat buf; 302 long size; 303 int file = -1; 304 int retval; 305 int rc = -1; 306 int namesize; 307 unsigned int i; 308 309 mode |= S_IFREG; 310 311 file = open (location, O_RDONLY); 312 if (file < 0) { 313 fprintf (stderr, "File %s could not be opened for reading\n", location); 314 goto error; 315 } 316 317 retval = fstat(file, &buf); 318 if (retval) { 319 fprintf(stderr, "File %s could not be stat()'ed\n", location); 320 goto error; 321 } 322 323 if (buf.st_mtime > 0xffffffff) { 324 fprintf(stderr, "%s: Timestamp exceeds maximum cpio timestamp, clipping.\n", 325 location); 326 buf.st_mtime = 0xffffffff; 327 } 328 329 filebuf = malloc(buf.st_size); 330 if (!filebuf) { 331 fprintf (stderr, "out of memory\n"); 332 goto error; 333 } 334 335 retval = read (file, filebuf, buf.st_size); 336 if (retval < 0) { 337 fprintf (stderr, "Can not read %s file\n", location); 338 goto error; 339 } 340 341 size = 0; 342 for (i = 1; i <= nlinks; i++) { 343 /* data goes on last link */ 344 if (i == nlinks) size = buf.st_size; 345 346 if (name[0] == '/') 347 name++; 348 namesize = strlen(name) + 1; 349 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX" 350 "%08lX%08X%08X%08X%08X%08X%08X", 351 "070701", /* magic */ 352 ino, /* ino */ 353 mode, /* mode */ 354 (long) uid, /* uid */ 355 (long) gid, /* gid */ 356 nlinks, /* nlink */ 357 (long) buf.st_mtime, /* mtime */ 358 size, /* filesize */ 359 3, /* major */ 360 1, /* minor */ 361 0, /* rmajor */ 362 0, /* rminor */ 363 namesize, /* namesize */ 364 0); /* chksum */ 365 push_hdr(s); 366 push_string(name); 367 push_pad(); 368 369 if (size) { 370 if (fwrite(filebuf, size, 1, stdout) != 1) { 371 fprintf(stderr, "writing filebuf failed\n"); 372 goto error; 373 } 374 offset += size; 375 push_pad(); 376 } 377 378 name += namesize; 379 } 380 ino++; 381 rc = 0; 382 383 error: 384 if (filebuf) free(filebuf); 385 if (file >= 0) close(file); 386 return rc; 387 } 388 389 static char *cpio_replace_env(char *new_location) 390 { 391 char expanded[PATH_MAX + 1]; 392 char *start, *end, *var; 393 394 while ((start = strstr(new_location, "${")) && 395 (end = strchr(start + 2, '}'))) { 396 *start = *end = 0; 397 var = getenv(start + 2); 398 snprintf(expanded, sizeof expanded, "%s%s%s", 399 new_location, var ? var : "", end + 1); 400 strcpy(new_location, expanded); 401 } 402 403 return new_location; 404 } 405 406 static int cpio_mkfile_line(const char *line) 407 { 408 char name[PATH_MAX + 1]; 409 char *dname = NULL; /* malloc'ed buffer for hard links */ 410 char location[PATH_MAX + 1]; 411 unsigned int mode; 412 int uid; 413 int gid; 414 int nlinks = 1; 415 int end = 0, dname_len = 0; 416 int rc = -1; 417 418 if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) 419 "s %o %d %d %n", 420 name, location, &mode, &uid, &gid, &end)) { 421 fprintf(stderr, "Unrecognized file format '%s'", line); 422 goto fail; 423 } 424 if (end && isgraph(line[end])) { 425 int len; 426 int nend; 427 428 dname = malloc(strlen(line)); 429 if (!dname) { 430 fprintf (stderr, "out of memory (%d)\n", dname_len); 431 goto fail; 432 } 433 434 dname_len = strlen(name) + 1; 435 memcpy(dname, name, dname_len); 436 437 do { 438 nend = 0; 439 if (sscanf(line + end, "%" str(PATH_MAX) "s %n", 440 name, &nend) < 1) 441 break; 442 len = strlen(name) + 1; 443 memcpy(dname + dname_len, name, len); 444 dname_len += len; 445 nlinks++; 446 end += nend; 447 } while (isgraph(line[end])); 448 } else { 449 dname = name; 450 } 451 rc = cpio_mkfile(dname, cpio_replace_env(location), 452 mode, uid, gid, nlinks); 453 fail: 454 if (dname_len) free(dname); 455 return rc; 456 } 457 458 static void usage(const char *prog) 459 { 460 fprintf(stderr, "Usage:\n" 461 "\t%s [-t <timestamp>] <cpio_list>\n" 462 "\n" 463 "<cpio_list> is a file containing newline separated entries that\n" 464 "describe the files to be included in the initramfs archive:\n" 465 "\n" 466 "# a comment\n" 467 "file <name> <location> <mode> <uid> <gid> [<hard links>]\n" 468 "dir <name> <mode> <uid> <gid>\n" 469 "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n" 470 "slink <name> <target> <mode> <uid> <gid>\n" 471 "pipe <name> <mode> <uid> <gid>\n" 472 "sock <name> <mode> <uid> <gid>\n" 473 "\n" 474 "<name> name of the file/dir/nod/etc in the archive\n" 475 "<location> location of the file in the current filesystem\n" 476 " expands shell variables quoted with ${}\n" 477 "<target> link target\n" 478 "<mode> mode/permissions of the file\n" 479 "<uid> user id (0=root)\n" 480 "<gid> group id (0=root)\n" 481 "<dev_type> device type (b=block, c=character)\n" 482 "<maj> major number of nod\n" 483 "<min> minor number of nod\n" 484 "<hard links> space separated list of other links to file\n" 485 "\n" 486 "example:\n" 487 "# A simple initramfs\n" 488 "dir /dev 0755 0 0\n" 489 "nod /dev/console 0600 0 0 c 5 1\n" 490 "dir /root 0700 0 0\n" 491 "dir /sbin 0755 0 0\n" 492 "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n" 493 "\n" 494 "<timestamp> is time in seconds since Epoch that will be used\n" 495 "as mtime for symlinks, special files and directories. The default\n" 496 "is to use the current time for these entries.\n", 497 prog); 498 } 499 500 static const struct file_handler file_handler_table[] = { 501 { 502 .type = "file", 503 .handler = cpio_mkfile_line, 504 }, { 505 .type = "nod", 506 .handler = cpio_mknod_line, 507 }, { 508 .type = "dir", 509 .handler = cpio_mkdir_line, 510 }, { 511 .type = "slink", 512 .handler = cpio_mkslink_line, 513 }, { 514 .type = "pipe", 515 .handler = cpio_mkpipe_line, 516 }, { 517 .type = "sock", 518 .handler = cpio_mksock_line, 519 }, { 520 .type = NULL, 521 .handler = NULL, 522 } 523 }; 524 525 #define LINE_SIZE (2 * PATH_MAX + 50) 526 527 int main (int argc, char *argv[]) 528 { 529 FILE *cpio_list; 530 char line[LINE_SIZE]; 531 char *args, *type; 532 int ec = 0; 533 int line_nr = 0; 534 const char *filename; 535 536 default_mtime = time(NULL); 537 while (1) { 538 int opt = getopt(argc, argv, "t:h"); 539 char *invalid; 540 541 if (opt == -1) 542 break; 543 switch (opt) { 544 case 't': 545 default_mtime = strtol(optarg, &invalid, 10); 546 if (!*optarg || *invalid) { 547 fprintf(stderr, "Invalid timestamp: %s\n", 548 optarg); 549 usage(argv[0]); 550 exit(1); 551 } 552 break; 553 case 'h': 554 case '?': 555 usage(argv[0]); 556 exit(opt == 'h' ? 0 : 1); 557 } 558 } 559 560 /* 561 * Timestamps after 2106-02-07 06:28:15 UTC have an ascii hex time_t 562 * representation that exceeds 8 chars and breaks the cpio header 563 * specification. 564 */ 565 if (default_mtime > 0xffffffff) { 566 fprintf(stderr, "ERROR: Timestamp too large for cpio format\n"); 567 exit(1); 568 } 569 570 if (argc - optind != 1) { 571 usage(argv[0]); 572 exit(1); 573 } 574 filename = argv[optind]; 575 if (!strcmp(filename, "-")) 576 cpio_list = stdin; 577 else if (!(cpio_list = fopen(filename, "r"))) { 578 fprintf(stderr, "ERROR: unable to open '%s': %s\n\n", 579 filename, strerror(errno)); 580 usage(argv[0]); 581 exit(1); 582 } 583 584 while (fgets(line, LINE_SIZE, cpio_list)) { 585 int type_idx; 586 size_t slen = strlen(line); 587 588 line_nr++; 589 590 if ('#' == *line) { 591 /* comment - skip to next line */ 592 continue; 593 } 594 595 if (! (type = strtok(line, " \t"))) { 596 fprintf(stderr, 597 "ERROR: incorrect format, could not locate file type line %d: '%s'\n", 598 line_nr, line); 599 ec = -1; 600 break; 601 } 602 603 if ('\n' == *type) { 604 /* a blank line */ 605 continue; 606 } 607 608 if (slen == strlen(type)) { 609 /* must be an empty line */ 610 continue; 611 } 612 613 if (! (args = strtok(NULL, "\n"))) { 614 fprintf(stderr, 615 "ERROR: incorrect format, newline required line %d: '%s'\n", 616 line_nr, line); 617 ec = -1; 618 } 619 620 for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) { 621 int rc; 622 if (! strcmp(line, file_handler_table[type_idx].type)) { 623 if ((rc = file_handler_table[type_idx].handler(args))) { 624 ec = rc; 625 fprintf(stderr, " line %d\n", line_nr); 626 } 627 break; 628 } 629 } 630 631 if (NULL == file_handler_table[type_idx].type) { 632 fprintf(stderr, "unknown file type line %d: '%s'\n", 633 line_nr, line); 634 } 635 } 636 if (ec == 0) 637 cpio_trailer(); 638 639 exit(ec); 640 } 641