1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini tar implementation for busybox 4 * 5 * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg 6 * Glenn McGrath <bug1@iinet.net.au> 7 * 8 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the 9 * ground up. It still has remnants of the old code lying about, but it is 10 * very different now (i.e., cleaner, less global variables, etc.) 11 * 12 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> 13 * 14 * Based in part in the tar implementation in sash 15 * Copyright (c) 1999 by David I. Bell 16 * Permission is granted to use, distribute, or modify this source, 17 * provided that this copyright notice remains intact. 18 * Permission to distribute sash derived code under the GPL has been granted. 19 * 20 * Based in part on the tar implementation from busybox-0.28 21 * Copyright (C) 1995 Bruce Perens 22 * 23 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 24 */ 25 26#include <fnmatch.h> 27#include <getopt.h> 28#include "libbb.h" 29#include "unarchive.h" 30 31#define block_buf bb_common_bufsiz1 32 33#if ENABLE_FEATURE_TAR_CREATE 34 35/* Tar file constants */ 36 37#define TAR_BLOCK_SIZE 512 38 39/* POSIX tar Header Block, from POSIX 1003.1-1990 */ 40#define NAME_SIZE 100 41#define NAME_SIZE_STR "100" 42typedef struct TarHeader TarHeader; 43struct TarHeader { /* byte offset */ 44 char name[NAME_SIZE]; /* 0-99 */ 45 char mode[8]; /* 100-107 */ 46 char uid[8]; /* 108-115 */ 47 char gid[8]; /* 116-123 */ 48 char size[12]; /* 124-135 */ 49 char mtime[12]; /* 136-147 */ 50 char chksum[8]; /* 148-155 */ 51 char typeflag; /* 156-156 */ 52 char linkname[NAME_SIZE]; /* 157-256 */ 53 char magic[6]; /* 257-262 */ 54 char version[2]; /* 263-264 */ 55 char uname[32]; /* 265-296 */ 56 char gname[32]; /* 297-328 */ 57 char devmajor[8]; /* 329-336 */ 58 char devminor[8]; /* 337-344 */ 59 char prefix[155]; /* 345-499 */ 60 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */ 61}; 62 63/* 64** writeTarFile(), writeFileToTarball(), and writeTarHeader() are 65** the only functions that deal with the HardLinkInfo structure. 66** Even these functions use the xxxHardLinkInfo() functions. 67*/ 68typedef struct HardLinkInfo HardLinkInfo; 69struct HardLinkInfo { 70 HardLinkInfo *next; /* Next entry in list */ 71 dev_t dev; /* Device number */ 72 ino_t ino; /* Inode number */ 73 short linkCount; /* (Hard) Link Count */ 74 char name[1]; /* Start of filename (must be last) */ 75}; 76 77/* Some info to be carried along when creating a new tarball */ 78typedef struct TarBallInfo TarBallInfo; 79struct TarBallInfo { 80 int tarFd; /* Open-for-write file descriptor 81 for the tarball */ 82 struct stat statBuf; /* Stat info for the tarball, letting 83 us know the inode and device that the 84 tarball lives, so we can avoid trying 85 to include the tarball into itself */ 86 int verboseFlag; /* Whether to print extra stuff or not */ 87 const llist_t *excludeList; /* List of files to not include */ 88 HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ 89 HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ 90}; 91 92/* A nice enum with all the possible tar file content types */ 93enum TarFileType { 94 REGTYPE = '0', /* regular file */ 95 REGTYPE0 = '\0', /* regular file (ancient bug compat) */ 96 LNKTYPE = '1', /* hard link */ 97 SYMTYPE = '2', /* symbolic link */ 98 CHRTYPE = '3', /* character special */ 99 BLKTYPE = '4', /* block special */ 100 DIRTYPE = '5', /* directory */ 101 FIFOTYPE = '6', /* FIFO special */ 102 CONTTYPE = '7', /* reserved */ 103 GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ 104 GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ 105}; 106typedef enum TarFileType TarFileType; 107 108/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ 109static void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr, 110 struct stat *statbuf, 111 const char *fileName) 112{ 113 /* Note: hlInfoHeadPtr can never be NULL! */ 114 HardLinkInfo *hlInfo; 115 116 hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); 117 hlInfo->next = *hlInfoHeadPtr; 118 *hlInfoHeadPtr = hlInfo; 119 hlInfo->dev = statbuf->st_dev; 120 hlInfo->ino = statbuf->st_ino; 121 hlInfo->linkCount = statbuf->st_nlink; 122 strcpy(hlInfo->name, fileName); 123} 124 125static void freeHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr) 126{ 127 HardLinkInfo *hlInfo; 128 HardLinkInfo *hlInfoNext; 129 130 if (hlInfoHeadPtr) { 131 hlInfo = *hlInfoHeadPtr; 132 while (hlInfo) { 133 hlInfoNext = hlInfo->next; 134 free(hlInfo); 135 hlInfo = hlInfoNext; 136 } 137 *hlInfoHeadPtr = NULL; 138 } 139} 140 141/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ 142static HardLinkInfo *findHardLinkInfo(HardLinkInfo * hlInfo, struct stat *statbuf) 143{ 144 while (hlInfo) { 145 if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev)) 146 break; 147 hlInfo = hlInfo->next; 148 } 149 return hlInfo; 150} 151 152/* Put an octal string into the specified buffer. 153 * The number is zero padded and possibly null terminated. 154 * Stores low-order bits only if whole value does not fit. */ 155static void putOctal(char *cp, int len, off_t value) 156{ 157 char tempBuffer[sizeof(off_t)*3+1]; 158 char *tempString = tempBuffer; 159 int width; 160 161 width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); 162 tempString += (width - len); 163 164 /* If string has leading zeroes, we can drop one */ 165 /* and field will have trailing '\0' */ 166 /* (increases chances of compat with other tars) */ 167 if (tempString[0] == '0') 168 tempString++; 169 170 /* Copy the string to the field */ 171 memcpy(cp, tempString, len); 172} 173#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) 174 175static void chksum_and_xwrite(int fd, struct TarHeader* hp) 176{ 177 /* POSIX says that checksum is done on unsigned bytes 178 * (Sun and HP-UX gets it wrong... more details in 179 * GNU tar source) */ 180 const unsigned char *cp; 181 int chksum, size; 182 183 strcpy(hp->magic, "ustar "); 184 185 /* Calculate and store the checksum (i.e., the sum of all of the bytes of 186 * the header). The checksum field must be filled with blanks for the 187 * calculation. The checksum field is formatted differently from the 188 * other fields: it has 6 digits, a null, then a space -- rather than 189 * digits, followed by a null like the other fields... */ 190 memset(hp->chksum, ' ', sizeof(hp->chksum)); 191 cp = (const unsigned char *) hp; 192 chksum = 0; 193 size = sizeof(*hp); 194 do { chksum += *cp++; } while (--size); 195 putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); 196 197 /* Now write the header out to disk */ 198 xwrite(fd, hp, sizeof(*hp)); 199} 200 201#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS 202static void writeLongname(int fd, int type, const char *name, int dir) 203{ 204 static const struct { 205 char mode[8]; /* 100-107 */ 206 char uid[8]; /* 108-115 */ 207 char gid[8]; /* 116-123 */ 208 char size[12]; /* 124-135 */ 209 char mtime[12]; /* 136-147 */ 210 } prefilled = { 211 "0000000", 212 "0000000", 213 "0000000", 214 "00000000000", 215 "00000000000", 216 }; 217 struct TarHeader header; 218 int size; 219 220 dir = !!dir; /* normalize: 0/1 */ 221 size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ 222 /* + dir: account for possible '/' */ 223 224 memset(&header, 0, sizeof(header)); 225 strcpy(header.name, "././@LongLink"); 226 memcpy(header.mode, prefilled.mode, sizeof(prefilled)); 227 PUT_OCTAL(header.size, size); 228 header.typeflag = type; 229 chksum_and_xwrite(fd, &header); 230 231 /* Write filename[/] and pad the block. */ 232 /* dir=0: writes 'name<NUL>', pads */ 233 /* dir=1: writes 'name', writes '/<NUL>', pads */ 234 dir *= 2; 235 xwrite(fd, name, size - dir); 236 xwrite(fd, "/", dir); 237 size = (-size) & (TAR_BLOCK_SIZE-1); 238 memset(&header, 0, size); 239 xwrite(fd, &header, size); 240} 241#endif 242 243/* Write out a tar header for the specified file/directory/whatever */ 244void BUG_tar_header_size(void); 245static int writeTarHeader(struct TarBallInfo *tbInfo, 246 const char *header_name, const char *fileName, struct stat *statbuf) 247{ 248 struct TarHeader header; 249 250 if (sizeof(header) != 512) 251 BUG_tar_header_size(); 252 253 memset(&header, 0, sizeof(struct TarHeader)); 254 255 strncpy(header.name, header_name, sizeof(header.name)); 256 257 /* POSIX says to mask mode with 07777. */ 258 PUT_OCTAL(header.mode, statbuf->st_mode & 07777); 259 PUT_OCTAL(header.uid, statbuf->st_uid); 260 PUT_OCTAL(header.gid, statbuf->st_gid); 261 memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ 262 PUT_OCTAL(header.mtime, statbuf->st_mtime); 263 264 /* Enter the user and group names */ 265 safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); 266 safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); 267 268 if (tbInfo->hlInfo) { 269 /* This is a hard link */ 270 header.typeflag = LNKTYPE; 271 strncpy(header.linkname, tbInfo->hlInfo->name, 272 sizeof(header.linkname)); 273#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS 274 /* Write out long linkname if needed */ 275 if (header.linkname[sizeof(header.linkname)-1]) 276 writeLongname(tbInfo->tarFd, GNULONGLINK, 277 tbInfo->hlInfo->name, 0); 278#endif 279 } else if (S_ISLNK(statbuf->st_mode)) { 280 char *lpath = xmalloc_readlink_or_warn(fileName); 281 if (!lpath) 282 return FALSE; 283 header.typeflag = SYMTYPE; 284 strncpy(header.linkname, lpath, sizeof(header.linkname)); 285#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS 286 /* Write out long linkname if needed */ 287 if (header.linkname[sizeof(header.linkname)-1]) 288 writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); 289#else 290 /* If it is larger than 100 bytes, bail out */ 291 if (header.linkname[sizeof(header.linkname)-1]) { 292 free(lpath); 293 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); 294 return FALSE; 295 } 296#endif 297 free(lpath); 298 } else if (S_ISDIR(statbuf->st_mode)) { 299 header.typeflag = DIRTYPE; 300 /* Append '/' only if there is a space for it */ 301 if (!header.name[sizeof(header.name)-1]) 302 header.name[strlen(header.name)] = '/'; 303 } else if (S_ISCHR(statbuf->st_mode)) { 304 header.typeflag = CHRTYPE; 305 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); 306 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); 307 } else if (S_ISBLK(statbuf->st_mode)) { 308 header.typeflag = BLKTYPE; 309 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); 310 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); 311 } else if (S_ISFIFO(statbuf->st_mode)) { 312 header.typeflag = FIFOTYPE; 313 } else if (S_ISREG(statbuf->st_mode)) { 314 if (sizeof(statbuf->st_size) > 4 315 && statbuf->st_size > (off_t)0777777777777LL 316 ) { 317 bb_error_msg_and_die("cannot store file '%s' " 318 "of size %"OFF_FMT"d, aborting", 319 fileName, statbuf->st_size); 320 } 321 header.typeflag = REGTYPE; 322 PUT_OCTAL(header.size, statbuf->st_size); 323 } else { 324 bb_error_msg("%s: unknown file type", fileName); 325 return FALSE; 326 } 327 328#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS 329 /* Write out long name if needed */ 330 /* (we, like GNU tar, output long linkname *before* long name) */ 331 if (header.name[sizeof(header.name)-1]) 332 writeLongname(tbInfo->tarFd, GNULONGNAME, 333 header_name, S_ISDIR(statbuf->st_mode)); 334#endif 335 336 /* Now write the header out to disk */ 337 chksum_and_xwrite(tbInfo->tarFd, &header); 338 339 /* Now do the verbose thing (or not) */ 340 if (tbInfo->verboseFlag) { 341 FILE *vbFd = stdout; 342 343 if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */ 344 vbFd = stderr; 345 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ 346 /* We don't have such excesses here: for us "v" == "vv" */ 347 /* '/' is probably a GNUism */ 348 fprintf(vbFd, "%s%s\n", header_name, 349 S_ISDIR(statbuf->st_mode) ? "/" : ""); 350 } 351 352 return TRUE; 353} 354 355#if ENABLE_FEATURE_TAR_FROM 356static int exclude_file(const llist_t *excluded_files, const char *file) 357{ 358 while (excluded_files) { 359 if (excluded_files->data[0] == '/') { 360 if (fnmatch(excluded_files->data, file, 361 FNM_PATHNAME | FNM_LEADING_DIR) == 0) 362 return 1; 363 } else { 364 const char *p; 365 366 for (p = file; p[0] != '\0'; p++) { 367 if ((p == file || p[-1] == '/') && p[0] != '/' && 368 fnmatch(excluded_files->data, p, 369 FNM_PATHNAME | FNM_LEADING_DIR) == 0) 370 return 1; 371 } 372 } 373 excluded_files = excluded_files->link; 374 } 375 376 return 0; 377} 378#else 379#define exclude_file(excluded_files, file) 0 380#endif 381 382static int writeFileToTarball(const char *fileName, struct stat *statbuf, 383 void *userData, int depth ATTRIBUTE_UNUSED) 384{ 385 struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; 386 const char *header_name; 387 int inputFileFd = -1; 388 389 /* 390 * Check to see if we are dealing with a hard link. 391 * If so - 392 * Treat the first occurance of a given dev/inode as a file while 393 * treating any additional occurances as hard links. This is done 394 * by adding the file information to the HardLinkInfo linked list. 395 */ 396 tbInfo->hlInfo = NULL; 397 if (statbuf->st_nlink > 1) { 398 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); 399 if (tbInfo->hlInfo == NULL) 400 addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, fileName); 401 } 402 403 /* It is against the rules to archive a socket */ 404 if (S_ISSOCK(statbuf->st_mode)) { 405 bb_error_msg("%s: socket ignored", fileName); 406 return TRUE; 407 } 408 409 /* It is a bad idea to store the archive we are in the process of creating, 410 * so check the device and inode to be sure that this particular file isn't 411 * the new tarball */ 412 if (tbInfo->statBuf.st_dev == statbuf->st_dev && 413 tbInfo->statBuf.st_ino == statbuf->st_ino) { 414 bb_error_msg("%s: file is the archive; skipping", fileName); 415 return TRUE; 416 } 417 418 header_name = fileName; 419 while (header_name[0] == '/') { 420 static smallint warned; 421 422 if (!warned) { 423 bb_error_msg("removing leading '/' from member names"); 424 warned = 1; 425 } 426 header_name++; 427 } 428 429#if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS 430 if (strlen(fileName) >= NAME_SIZE) { 431 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); 432 return TRUE; 433 } 434#endif 435 436 if (header_name[0] == '\0') 437 return TRUE; 438 439 if (exclude_file(tbInfo->excludeList, header_name)) 440 return SKIP; 441 442 /* Is this a regular file? */ 443 if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { 444 /* open the file we want to archive, and make sure all is well */ 445 inputFileFd = open_or_warn(fileName, O_RDONLY); 446 if (inputFileFd < 0) { 447 return FALSE; 448 } 449 } 450 451 /* Add an entry to the tarball */ 452 if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { 453 return FALSE; 454 } 455 456 /* If it was a regular file, write out the body */ 457 if (inputFileFd >= 0) { 458 size_t readSize; 459 /* Write the file to the archive. */ 460 /* We record size into header first, */ 461 /* and then write out file. If file shrinks in between, */ 462 /* tar will be corrupted. So we don't allow for that. */ 463 /* NB: GNU tar 1.16 warns and pads with zeroes */ 464 /* or even seeks back and updates header */ 465 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); 466 ////off_t readSize; 467 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); 468 ////if (readSize != statbuf->st_size && readSize >= 0) { 469 //// bb_error_msg_and_die("short read from %s, aborting", fileName); 470 ////} 471 472 /* Check that file did not grow in between? */ 473 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ 474 475 close(inputFileFd); 476 477 /* Pad the file up to the tar block size */ 478 /* (a few tricks here in the name of code size) */ 479 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); 480 memset(block_buf, 0, readSize); 481 xwrite(tbInfo->tarFd, block_buf, readSize); 482 } 483 484 return TRUE; 485} 486 487static int writeTarFile(const int tar_fd, const int verboseFlag, 488 const unsigned long dereferenceFlag, const llist_t *include, 489 const llist_t *exclude, const int gzip) 490{ 491 pid_t gzipPid = 0; 492 int errorFlag = FALSE; 493 struct TarBallInfo tbInfo; 494 495 tbInfo.hlInfoHead = NULL; 496 497 fchmod(tar_fd, 0644); 498 tbInfo.tarFd = tar_fd; 499 tbInfo.verboseFlag = verboseFlag; 500 501 /* Store the stat info for the tarball's file, so 502 * can avoid including the tarball into itself.... */ 503 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0) 504 bb_perror_msg_and_die("cannot stat tar file"); 505 506 if ((ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2) && gzip) { 507 int gzipDataPipe[2] = { -1, -1 }; 508 int gzipStatusPipe[2] = { -1, -1 }; 509 volatile int vfork_exec_errno = 0; 510 const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; 511 512 xpipe(gzipDataPipe); 513 xpipe(gzipStatusPipe); 514 515 signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ 516 517#if defined(__GNUC__) && __GNUC__ 518 /* Avoid vfork clobbering */ 519 (void) &include; 520 (void) &errorFlag; 521 (void) &zip_exec; 522#endif 523 524 gzipPid = vfork(); 525 526 if (gzipPid == 0) { 527 dup2(gzipDataPipe[0], 0); 528 close(gzipDataPipe[1]); 529 530 dup2(tbInfo.tarFd, 1); 531 532 close(gzipStatusPipe[0]); 533 fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */ 534 535 BB_EXECLP(zip_exec, zip_exec, "-f", NULL); 536 vfork_exec_errno = errno; 537 538 close(gzipStatusPipe[1]); 539 exit(-1); 540 } else if (gzipPid > 0) { 541 close(gzipDataPipe[0]); 542 close(gzipStatusPipe[1]); 543 544 while (1) { 545 char buf; 546 547 int n = full_read(gzipStatusPipe[0], &buf, 1); 548 549 if (n == 0 && vfork_exec_errno != 0) { 550 errno = vfork_exec_errno; 551 bb_perror_msg_and_die("cannot exec %s", zip_exec); 552 } else if ((n < 0) && (errno == EAGAIN || errno == EINTR)) 553 continue; /* try it again */ 554 break; 555 } 556 close(gzipStatusPipe[0]); 557 558 tbInfo.tarFd = gzipDataPipe[1]; 559 } else bb_perror_msg_and_die("vfork gzip"); 560 } 561 562 tbInfo.excludeList = exclude; 563 564 /* Read the directory/files and iterate over them one at a time */ 565 while (include) { 566 if (!recursive_action(include->data, ACTION_RECURSE | 567 (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), 568 writeFileToTarball, writeFileToTarball, &tbInfo, 0)) 569 { 570 errorFlag = TRUE; 571 } 572 include = include->link; 573 } 574 /* Write two empty blocks to the end of the archive */ 575 memset(block_buf, 0, 2*TAR_BLOCK_SIZE); 576 xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); 577 578 /* To be pedantically correct, we would check if the tarball 579 * is smaller than 20 tar blocks, and pad it if it was smaller, 580 * but that isn't necessary for GNU tar interoperability, and 581 * so is considered a waste of space */ 582 583 /* Close so the child process (if any) will exit */ 584 close(tbInfo.tarFd); 585 586 /* Hang up the tools, close up shop, head home */ 587 if (ENABLE_FEATURE_CLEAN_UP) 588 freeHardLinkInfo(&tbInfo.hlInfoHead); 589 590 if (errorFlag) 591 bb_error_msg("error exit delayed from previous errors"); 592 593 if (gzipPid) { 594 int status; 595 if (waitpid(gzipPid, &status, 0) == -1) 596 bb_perror_msg("waitpid"); 597 else if (!WIFEXITED(status) || WEXITSTATUS(status)) 598 /* gzip was killed or has exited with nonzero! */ 599 errorFlag = TRUE; 600 } 601 return errorFlag; 602} 603#else 604int writeTarFile(const int tar_fd, const int verboseFlag, 605 const unsigned long dereferenceFlag, const llist_t *include, 606 const llist_t *exclude, const int gzip); 607#endif /* FEATURE_TAR_CREATE */ 608 609#if ENABLE_FEATURE_TAR_FROM 610static llist_t *append_file_list_to_list(llist_t *list) 611{ 612 FILE *src_stream; 613 llist_t *cur = list; 614 llist_t *tmp; 615 char *line; 616 llist_t *newlist = NULL; 617 618 while (cur) { 619 src_stream = xfopen(cur->data, "r"); 620 tmp = cur; 621 cur = cur->link; 622 free(tmp); 623 while ((line = xmalloc_getline(src_stream)) != NULL) { 624 /* kill trailing '/' unless the string is just "/" */ 625 char *cp = last_char_is(line, '/'); 626 if (cp > line) 627 *cp = '\0'; 628 llist_add_to(&newlist, line); 629 } 630 fclose(src_stream); 631 } 632 return newlist; 633} 634#else 635#define append_file_list_to_list(x) 0 636#endif 637 638#if ENABLE_FEATURE_TAR_COMPRESS 639static char get_header_tar_Z(archive_handle_t *archive_handle) 640{ 641 /* Can't lseek over pipes */ 642 archive_handle->seek = seek_by_read; 643 644 /* do the decompression, and cleanup */ 645 if (xread_char(archive_handle->src_fd) != 0x1f 646 || xread_char(archive_handle->src_fd) != 0x9d 647 ) { 648 bb_error_msg_and_die("invalid magic"); 649 } 650 651 archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress, "uncompress", "uncompress", "-cf", "-", NULL); 652 archive_handle->offset = 0; 653 while (get_header_tar(archive_handle) == EXIT_SUCCESS) 654 /* nothing */; 655 656 /* Can only do one file at a time */ 657 return EXIT_FAILURE; 658} 659#else 660#define get_header_tar_Z NULL 661#endif 662 663#ifdef CHECK_FOR_CHILD_EXITCODE 664/* Looks like it isn't needed - tar detects malformed (truncated) 665 * archive if e.g. bunzip2 fails */ 666static int child_error; 667 668static void handle_SIGCHLD(int status) 669{ 670 /* Actually, 'status' is a signo. We reuse it for other needs */ 671 672 /* Wait for any child without blocking */ 673 if (waitpid(-1, &status, WNOHANG) < 0) 674 /* wait failed?! I'm confused... */ 675 return; 676 677 if (WIFEXITED(status) && WEXITSTATUS(status)==0) 678 /* child exited with 0 */ 679 return; 680 /* Cannot happen? 681 if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ 682 child_error = 1; 683} 684#endif 685 686enum { 687 OPTBIT_KEEP_OLD = 7, 688 USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) 689 USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) 690 USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,) 691 USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,) 692 USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) 693 USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) 694 USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,) 695 USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,) 696 OPTBIT_NOPRESERVE_OWN, 697 OPTBIT_NOPRESERVE_PERM, 698 OPT_TEST = 1 << 0, // t 699 OPT_EXTRACT = 1 << 1, // x 700 OPT_BASEDIR = 1 << 2, // C 701 OPT_TARNAME = 1 << 3, // f 702 OPT_2STDOUT = 1 << 4, // O 703 OPT_P = 1 << 5, // p 704 OPT_VERBOSE = 1 << 6, // v 705 OPT_KEEP_OLD = 1 << 7, // k 706 OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c 707 OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h 708 OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j 709 OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a 710 OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T 711 OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X 712 OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z 713 OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z 714 OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner 715 OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions 716}; 717#if ENABLE_FEATURE_TAR_LONG_OPTIONS 718static const char tar_longopts[] ALIGN1 = 719 "list\0" No_argument "t" 720 "extract\0" No_argument "x" 721 "directory\0" Required_argument "C" 722 "file\0" Required_argument "f" 723 "to-stdout\0" No_argument "O" 724 "same-permissions\0" No_argument "p" 725 "verbose\0" No_argument "v" 726 "keep-old\0" No_argument "k" 727# if ENABLE_FEATURE_TAR_CREATE 728 "create\0" No_argument "c" 729 "dereference\0" No_argument "h" 730# endif 731# if ENABLE_FEATURE_TAR_BZIP2 732 "bzip2\0" No_argument "j" 733# endif 734# if ENABLE_FEATURE_TAR_LZMA 735 "lzma\0" No_argument "a" 736# endif 737# if ENABLE_FEATURE_TAR_FROM 738 "files-from\0" Required_argument "T" 739 "exclude-from\0" Required_argument "X" 740# endif 741# if ENABLE_FEATURE_TAR_GZIP 742 "gzip\0" No_argument "z" 743# endif 744# if ENABLE_FEATURE_TAR_COMPRESS 745 "compress\0" No_argument "Z" 746# endif 747 "no-same-owner\0" No_argument "\xfd" 748 "no-same-permissions\0" No_argument "\xfe" 749 /* --exclude takes next bit position in option mask, */ 750 /* therefore we have to either put it _after_ --no-same-perm */ 751 /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */ 752# if ENABLE_FEATURE_TAR_FROM 753 "exclude\0" Required_argument "\xff" 754# endif 755 ; 756#endif 757 758int tar_main(int argc, char **argv); 759int tar_main(int argc, char **argv) 760{ 761 char (*get_header_ptr)(archive_handle_t *) = get_header_tar; 762 archive_handle_t *tar_handle; 763 char *base_dir = NULL; 764 const char *tar_filename = "-"; 765 unsigned opt; 766 int verboseFlag = 0; 767#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM 768 llist_t *excludes = NULL; 769#endif 770 771 /* Initialise default values */ 772 tar_handle = init_handle(); 773 tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS 774 | ARCHIVE_PRESERVE_DATE 775 | ARCHIVE_EXTRACT_UNCONDITIONAL; 776 777 /* Prepend '-' to the first argument if required */ 778 opt_complementary = "--:" // first arg is options 779 "tt:vv:" // count -t,-v 780 "?:" // bail out with usage instead of error return 781 "X::T::" // cumulative lists 782#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM 783 "\xff::" // cumulative lists for --exclude 784#endif 785 USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd 786 USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive 787 SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive 788#if ENABLE_FEATURE_TAR_LONG_OPTIONS 789 applet_long_options = tar_longopts; 790#endif 791 opt = getopt32(argv, 792 "txC:f:Opvk" 793 USE_FEATURE_TAR_CREATE( "ch" ) 794 USE_FEATURE_TAR_BZIP2( "j" ) 795 USE_FEATURE_TAR_LZMA( "a" ) 796 USE_FEATURE_TAR_FROM( "T:X:") 797 USE_FEATURE_TAR_GZIP( "z" ) 798 USE_FEATURE_TAR_COMPRESS("Z" ) 799 , &base_dir // -C dir 800 , &tar_filename // -f filename 801 USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T 802 USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X 803#if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM 804 , &excludes // --exclude 805#endif 806 , &verboseFlag // combined count for -t and -v 807 , &verboseFlag // combined count for -t and -v 808 ); 809 810 if (verboseFlag) tar_handle->action_header = header_verbose_list; 811 if (verboseFlag == 1) tar_handle->action_header = header_list; 812 813 if (opt & OPT_EXTRACT) 814 tar_handle->action_data = data_extract_all; 815 816 if (opt & OPT_2STDOUT) 817 tar_handle->action_data = data_extract_to_stdout; 818 819 if (opt & OPT_KEEP_OLD) 820 tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL; 821 822 if (opt & OPT_NOPRESERVE_OWN) 823 tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN; 824 825 if (opt & OPT_NOPRESERVE_PERM) 826 tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM; 827 828 if (opt & OPT_GZIP) 829 get_header_ptr = get_header_tar_gz; 830 831 if (opt & OPT_BZIP2) 832 get_header_ptr = get_header_tar_bz2; 833 834 if (opt & OPT_LZMA) 835 get_header_ptr = get_header_tar_lzma; 836 837 if (opt & OPT_COMPRESS) 838 get_header_ptr = get_header_tar_Z; 839 840#if ENABLE_FEATURE_TAR_FROM 841 tar_handle->reject = append_file_list_to_list(tar_handle->reject); 842#if ENABLE_FEATURE_TAR_LONG_OPTIONS 843 /* Append excludes to reject */ 844 while (excludes) { 845 llist_t *next = excludes->link; 846 excludes->link = tar_handle->reject; 847 tar_handle->reject = excludes; 848 excludes = next; 849 } 850#endif 851 tar_handle->accept = append_file_list_to_list(tar_handle->accept); 852#endif 853 854 /* Check if we are reading from stdin */ 855 if (argv[optind] && *argv[optind] == '-') { 856 /* Default is to read from stdin, so just skip to next arg */ 857 optind++; 858 } 859 860 /* Setup an array of filenames to work with */ 861 /* TODO: This is the same as in ar, separate function ? */ 862 while (optind < argc) { 863 /* kill trailing '/' unless the string is just "/" */ 864 char *cp = last_char_is(argv[optind], '/'); 865 if (cp > argv[optind]) 866 *cp = '\0'; 867 llist_add_to_end(&tar_handle->accept, argv[optind]); 868 optind++; 869 } 870 871 if (tar_handle->accept || tar_handle->reject) 872 tar_handle->filter = filter_accept_reject_list; 873 874 /* Open the tar file */ 875 { 876 FILE *tar_stream; 877 int flags; 878 879 if (opt & OPT_CREATE) { 880 /* Make sure there is at least one file to tar up. */ 881 if (tar_handle->accept == NULL) 882 bb_error_msg_and_die("empty archive"); 883 884 tar_stream = stdout; 885 /* Mimicking GNU tar 1.15.1: */ 886 flags = O_WRONLY|O_CREAT|O_TRUNC; 887 /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */ 888 } else { 889 tar_stream = stdin; 890 flags = O_RDONLY; 891 } 892 893 if (LONE_DASH(tar_filename)) { 894 tar_handle->src_fd = fileno(tar_stream); 895 tar_handle->seek = seek_by_read; 896 } else { 897 tar_handle->src_fd = xopen(tar_filename, flags); 898 } 899 } 900 901 if (base_dir) 902 xchdir(base_dir); 903 904#ifdef CHECK_FOR_CHILD_EXITCODE 905 /* We need to know whether child (gzip/bzip/etc) exits abnormally */ 906 signal(SIGCHLD, handle_SIGCHLD); 907#endif 908 909 /* create an archive */ 910 if (opt & OPT_CREATE) { 911 int zipMode = 0; 912 if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz) 913 zipMode = 1; 914 if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2) 915 zipMode = 2; 916 /* NB: writeTarFile() closes tar_handle->src_fd */ 917 return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, 918 tar_handle->accept, 919 tar_handle->reject, zipMode); 920 } 921 922 while (get_header_ptr(tar_handle) == EXIT_SUCCESS) 923 /* nothing */; 924 925 /* Check that every file that should have been extracted was */ 926 while (tar_handle->accept) { 927 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) 928 && !find_list_entry(tar_handle->passed, tar_handle->accept->data) 929 ) { 930 bb_error_msg_and_die("%s: not found in archive", 931 tar_handle->accept->data); 932 } 933 tar_handle->accept = tar_handle->accept->link; 934 } 935 if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) 936 close(tar_handle->src_fd); 937 938 return EXIT_SUCCESS; 939} 940