diff options
Diffstat (limited to 'release/src/router/busybox/archival/cpio.c')
| -rw-r--r-- | release/src/router/busybox/archival/cpio.c | 447 |
1 files changed, 388 insertions, 59 deletions
diff --git a/release/src/router/busybox/archival/cpio.c b/release/src/router/busybox/archival/cpio.c index 111807c4..11b22e47 100644 --- a/release/src/router/busybox/archival/cpio.c +++ b/release/src/router/busybox/archival/cpio.c @@ -2,83 +2,412 @@ /* * Mini cpio implementation for busybox * - * Copyright (C) 2001 by Glenn McGrath + * Copyright (C) 2001 by Glenn McGrath * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * Limitations: - * Doesn't check CRC's - * Only supports new ASCII and CRC formats + * Doesn't check CRC's + * Only supports new ASCII and CRC formats * */ -#include <fcntl.h> -#include <getopt.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> +#include "libbb.h" #include "unarchive.h" -#include "busybox.h" -extern int cpio_main(int argc, char **argv) +/* GNU cpio 2.9 --help (abridged): + + Modes: + -t, --list List the archive + -i, --extract Extract files from an archive + -o, --create Create the archive + -p, --pass-through Copy-pass mode [was ist das?!] + + Options valid in any mode: + --block-size=SIZE I/O block size = SIZE * 512 bytes + -B I/O block size = 5120 bytes + -c Use the old portable (ASCII) archive format + -C, --io-size=NUMBER I/O block size in bytes + -f, --nonmatching Only copy files that do not match given pattern + -F, --file=FILE Use FILE instead of standard input or output + -H, --format=FORMAT Use given archive FORMAT + -M, --message=STRING Print STRING when the end of a volume of the + backup media is reached + -n, --numeric-uid-gid If -v, show numeric UID and GID + --quiet Do not print the number of blocks copied + --rsh-command=COMMAND Use remote COMMAND instead of rsh + -v, --verbose Verbosely list the files processed + -V, --dot Print a "." for each file processed + -W, --warning=FLAG Control warning display: 'none','truncate','all'; + multiple options accumulate + + Options valid only in --extract mode: + -b, --swap Swap both halfwords of words and bytes of + halfwords in the data (equivalent to -sS) + -r, --rename Interactively rename files + -s, --swap-bytes Swap the bytes of each halfword in the files + -S, --swap-halfwords Swap the halfwords of each word (4 bytes) + --to-stdout Extract files to standard output + -E, --pattern-file=FILE Read additional patterns specifying filenames to + extract or list from FILE + --only-verify-crc Verify CRC's, don't actually extract the files + + Options valid only in --create mode: + -A, --append Append to an existing archive + -O FILE File to use instead of standard output + + Options valid only in --pass-through mode: + -l, --link Link files instead of copying them, when possible + + Options valid in --extract and --create modes: + --absolute-filenames Do not strip file system prefix components from + the file names + --no-absolute-filenames Create all files relative to the current dir + + Options valid in --create and --pass-through modes: + -0, --null A list of filenames is terminated by a NUL + -a, --reset-access-time Reset the access times of files after reading them + -I FILE File to use instead of standard input + -L, --dereference Dereference symbolic links (copy the files + that they point to instead of copying the links) + -R, --owner=[USER][:.][GROUP] Set owner of created files + + Options valid in --extract and --pass-through modes: + -d, --make-directories Create leading directories where needed + -m, --preserve-modification-time Retain mtime when creating files + --no-preserve-owner Do not change the ownership of the files + --sparse Write files with blocks of zeros as sparse files + -u, --unconditional Replace all files unconditionally + */ +enum { + CPIO_OPT_EXTRACT = (1 << 0), + CPIO_OPT_TEST = (1 << 1), + CPIO_OPT_NUL_TERMINATED = (1 << 2), + CPIO_OPT_UNCONDITIONAL = (1 << 3), + CPIO_OPT_VERBOSE = (1 << 4), + CPIO_OPT_CREATE_LEADING_DIR = (1 << 5), + CPIO_OPT_PRESERVE_MTIME = (1 << 6), + CPIO_OPT_DEREF = (1 << 7), + CPIO_OPT_FILE = (1 << 8), + CPIO_OPT_CREATE = (1 << 9) * ENABLE_FEATURE_CPIO_O, + CPIO_OPT_FORMAT = (1 << 10) * ENABLE_FEATURE_CPIO_O, + CPIO_OPT_PASSTHROUGH = (1 << 11) * ENABLE_FEATURE_CPIO_P, +}; + +#define OPTION_STR "it0uvdmLF:" + +#if ENABLE_FEATURE_CPIO_O +static off_t cpio_pad4(off_t size) +{ + int i; + + i = (- size) & 3; + size += i; + while (--i >= 0) + bb_putchar('\0'); + return size; +} + +/* Return value will become exit code. + * It's ok to exit instead of return. */ +static int cpio_o(void) +{ + static const char trailer[] ALIGN1 = "TRAILER!!!"; + struct name_s { + struct name_s *next; + char name[1]; + }; + struct inodes_s { + struct inodes_s *next; + struct name_s *names; + struct stat st; + }; + + struct inodes_s *links = NULL; + off_t bytes = 0; /* output bytes count */ + + while (1) { + const char *name; + char *line; + struct stat st; + + line = (option_mask32 & CPIO_OPT_NUL_TERMINATED) + ? bb_get_chunk_from_file(stdin, NULL) + : xmalloc_fgetline(stdin); + + if (line) { + /* Strip leading "./[./]..." from the filename */ + name = line; + while (name[0] == '.' && name[1] == '/') { + while (*++name == '/') + continue; + } + if (!*name) { /* line is empty */ + free(line); + continue; + } + if ((option_mask32 & CPIO_OPT_DEREF) + ? stat(name, &st) + : lstat(name, &st) + ) { + abort_cpio_o: + bb_simple_perror_msg_and_die(name); + } + + if (!(S_ISLNK(st.st_mode) || S_ISREG(st.st_mode))) + st.st_size = 0; /* paranoia */ + + /* Store hardlinks for later processing, dont output them */ + if (!S_ISDIR(st.st_mode) && st.st_nlink > 1) { + struct name_s *n; + struct inodes_s *l; + + /* Do we have this hardlink remembered? */ + l = links; + while (1) { + if (l == NULL) { + /* Not found: add new item to "links" list */ + l = xzalloc(sizeof(*l)); + l->st = st; + l->next = links; + links = l; + break; + } + if (l->st.st_ino == st.st_ino) { + /* found */ + break; + } + l = l->next; + } + /* Add new name to "l->names" list */ + n = xmalloc(sizeof(*n) + strlen(name)); + strcpy(n->name, name); + n->next = l->names; + l->names = n; + + free(line); + continue; + } + + } else { /* line == NULL: EOF */ + next_link: + if (links) { + /* Output hardlink's data */ + st = links->st; + name = links->names->name; + links->names = links->names->next; + /* GNU cpio is reported to emit file data + * only for the last instance. Mimic that. */ + if (links->names == NULL) + links = links->next; + else + st.st_size = 0; + /* NB: we leak links->names and/or links, + * this is intended (we exit soon anyway) */ + } else { + /* If no (more) hardlinks to output, + * output "trailer" entry */ + name = trailer; + /* st.st_size == 0 is a must, but for uniformity + * in the output, we zero out everything */ + memset(&st, 0, sizeof(st)); + /* st.st_nlink = 1; - GNU cpio does this */ + } + } + + bytes += printf("070701" + "%08X%08X%08X%08X%08X%08X%08X" + "%08X%08X%08X%08X" /* GNU cpio uses uppercase hex */ + /* strlen+1: */ "%08X" + /* chksum: */ "00000000" /* (only for "070702" files) */ + /* name,NUL: */ "%s%c", + (unsigned)(uint32_t) st.st_ino, + (unsigned)(uint32_t) st.st_mode, + (unsigned)(uint32_t) st.st_uid, + (unsigned)(uint32_t) st.st_gid, + (unsigned)(uint32_t) st.st_nlink, + (unsigned)(uint32_t) st.st_mtime, + (unsigned)(uint32_t) st.st_size, + (unsigned)(uint32_t) major(st.st_dev), + (unsigned)(uint32_t) minor(st.st_dev), + (unsigned)(uint32_t) major(st.st_rdev), + (unsigned)(uint32_t) minor(st.st_rdev), + (unsigned)(strlen(name) + 1), + name, '\0'); + bytes = cpio_pad4(bytes); + + if (st.st_size) { + if (S_ISLNK(st.st_mode)) { + char *lpath = xmalloc_readlink_or_warn(name); + if (!lpath) + goto abort_cpio_o; + bytes += printf("%s", lpath); + free(lpath); + } else { /* S_ISREG */ + int fd = xopen(name, O_RDONLY); + fflush(stdout); + /* We must abort if file got shorter too! */ + bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size); + bytes += st.st_size; + close(fd); + } + bytes = cpio_pad4(bytes); + } + + if (!line) { + if (name != trailer) + goto next_link; + /* TODO: GNU cpio pads trailer to 512 bytes, do we want that? */ + return EXIT_SUCCESS; + } + + free(line); + } /* end of "while (1)" */ +} +#endif + +int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int cpio_main(int argc UNUSED_PARAM, char **argv) { archive_handle_t *archive_handle; - int opt; + char *cpio_filename; + USE_FEATURE_CPIO_O(const char *cpio_fmt = "";) + unsigned opt; + +#if ENABLE_GETOPT_LONG + applet_long_options = + "extract\0" No_argument "i" + "list\0" No_argument "t" +#if ENABLE_FEATURE_CPIO_O + "create\0" No_argument "o" + "format\0" Required_argument "H" +#if ENABLE_FEATURE_CPIO_P + "pass-through\0" No_argument "p" +#endif +#endif + ; +#endif + + /* As of now we do not enforce this: */ + /* -i,-t,-o,-p are mutually exclusive */ + /* -u,-d,-m make sense only with -i or -p */ + /* -L makes sense only with -o or -p */ + +#if !ENABLE_FEATURE_CPIO_O + opt = getopt32(argv, OPTION_STR, &cpio_filename); +#else + opt = getopt32(argv, OPTION_STR "oH:" USE_FEATURE_CPIO_P("p"), &cpio_filename, &cpio_fmt); + if (opt & CPIO_OPT_PASSTHROUGH) { + pid_t pid; + struct fd_pair pp; + + if (argv[optind] == NULL) + bb_show_usage(); + if (opt & CPIO_OPT_CREATE_LEADING_DIR) + mkdir(argv[optind], 0777); + /* Crude existence check: + * close(xopen(argv[optind], O_RDONLY | O_DIRECTORY)); + * We can also xopen, fstat, IS_DIR, later fchdir. + * This would check for existence earlier and cleaner. + * As it stands now, if we fail xchdir later, + * child dies on EPIPE, unless it caught + * a diffrerent problem earlier. + * This is good enough for now. + */ +#if !BB_MMU + pp.rd = 3; + pp.wr = 4; + if (!re_execed) { + close(3); + close(4); + xpiped_pair(pp); + } +#else + xpiped_pair(pp); +#endif + pid = fork_or_rexec(argv); + if (pid == 0) { /* child */ + close(pp.rd); + xmove_fd(pp.wr, STDOUT_FILENO); + goto dump; + } + /* parent */ + xchdir(argv[optind++]); + close(pp.wr); + xmove_fd(pp.rd, STDIN_FILENO); + opt &= ~CPIO_OPT_PASSTHROUGH; + opt |= CPIO_OPT_EXTRACT; + goto skip; + } + /* -o */ + if (opt & CPIO_OPT_CREATE) { + if (*cpio_fmt != 'n') /* we _require_ "-H newc" */ + bb_show_usage(); + if (opt & CPIO_OPT_FILE) { + fclose(stdout); + stdout = fopen_for_write(cpio_filename); + /* Paranoia: I don't trust libc that much */ + xdup2(fileno(stdout), STDOUT_FILENO); + } + dump: + return cpio_o(); + } + skip: +#endif + argv += optind; - /* Initialise */ archive_handle = init_handle(); - archive_handle->src_fd = fileno(stdin); - archive_handle->seek = seek_by_char; - archive_handle->action_header = header_list; - - while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) { - switch (opt) { - case 'i': /* extract */ - archive_handle->action_data = data_extract_all; - break; - case 'd': /* create _leading_ directories */ - archive_handle->flags |= ARCHIVE_CREATE_LEADING_DIRS; - break; - case 'm': /* preserve modification time */ - archive_handle->flags |= ARCHIVE_PRESERVE_DATE; - break; - case 'v': /* verbosly list files */ + archive_handle->src_fd = STDIN_FILENO; + archive_handle->seek = seek_by_read; + archive_handle->ah_flags = ARCHIVE_EXTRACT_NEWER; + + /* One of either extract or test options must be given */ + if ((opt & (CPIO_OPT_TEST | CPIO_OPT_EXTRACT)) == 0) { + bb_show_usage(); + } + + if (opt & CPIO_OPT_TEST) { + /* if both extract and test options are given, ignore extract option */ + opt &= ~CPIO_OPT_EXTRACT; + archive_handle->action_header = header_list; + } + if (opt & CPIO_OPT_EXTRACT) { + archive_handle->action_data = data_extract_all; + } + if (opt & CPIO_OPT_UNCONDITIONAL) { + archive_handle->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL; + archive_handle->ah_flags &= ~ARCHIVE_EXTRACT_NEWER; + } + if (opt & CPIO_OPT_VERBOSE) { + if (archive_handle->action_header == header_list) { archive_handle->action_header = header_verbose_list; - break; - case 'u': /* unconditional */ - archive_handle->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL; - break; - case 't': /* list files */ + } else { archive_handle->action_header = header_list; - break; - case 'F': - archive_handle->src_fd = bb_xopen(optarg, O_RDONLY); - archive_handle->seek = seek_by_jump; - break; - default: - bb_show_usage(); } } + if (opt & CPIO_OPT_FILE) { /* -F */ + archive_handle->src_fd = xopen(cpio_filename, O_RDONLY); + archive_handle->seek = seek_by_jump; + } + if (opt & CPIO_OPT_CREATE_LEADING_DIR) { + archive_handle->ah_flags |= ARCHIVE_CREATE_LEADING_DIRS; + } + if (opt & CPIO_OPT_PRESERVE_MTIME) { + archive_handle->ah_flags |= ARCHIVE_PRESERVE_DATE; + } - while (optind < argc) { + while (*argv) { archive_handle->filter = filter_accept_list; - archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]); - optind++; + llist_add_to(&(archive_handle->accept), *argv); + argv++; } - while (get_header_cpio(archive_handle) == EXIT_SUCCESS); + /* see get_header_cpio */ + archive_handle->ah_priv[2] = (void*) ~(ptrdiff_t)0; + while (get_header_cpio(archive_handle) == EXIT_SUCCESS) + continue; - return(EXIT_SUCCESS); -} + if (archive_handle->ah_priv[2] != (void*) ~(ptrdiff_t)0) + printf("%lu blocks\n", (unsigned long)(ptrdiff_t)(archive_handle->ah_priv[2])); + return EXIT_SUCCESS; +} |