[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 4 | */
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| 5 |
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| 6 | #include "libbb.h"
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[3232] | 7 | #include "bb_archive.h"
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[2725] | 8 |
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| 9 | void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
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| 10 | {
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| 11 | file_header_t *file_header = archive_handle->file_header;
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| 12 | int dst_fd;
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| 13 | int res;
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[3621] | 14 | char *hard_link;
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| 15 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
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| 16 | char *dst_name;
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| 17 | #else
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| 18 | # define dst_name (file_header->name)
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| 19 | #endif
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[2725] | 20 |
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| 21 | #if ENABLE_FEATURE_TAR_SELINUX
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[3232] | 22 | char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
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[2725] | 23 | if (!sctx)
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[3232] | 24 | sctx = archive_handle->tar__sctx[PAX_GLOBAL];
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[2725] | 25 | if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
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| 26 | setfscreatecon(sctx);
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[3232] | 27 | free(archive_handle->tar__sctx[PAX_NEXT_FILE]);
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| 28 | archive_handle->tar__sctx[PAX_NEXT_FILE] = NULL;
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[2725] | 29 | }
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| 30 | #endif
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| 31 |
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[3621] | 32 | /* Hard links are encoded as regular files of size 0
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| 33 | * with a nonempty link field */
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| 34 | hard_link = NULL;
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| 35 | if (S_ISREG(file_header->mode) && file_header->size == 0)
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| 36 | hard_link = file_header->link_target;
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| 37 |
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| 38 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
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| 39 | dst_name = file_header->name;
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| 40 | if (archive_handle->tar__strip_components) {
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| 41 | unsigned n = archive_handle->tar__strip_components;
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| 42 | do {
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| 43 | dst_name = strchr(dst_name, '/');
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| 44 | if (!dst_name || dst_name[1] == '\0') {
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| 45 | data_skip(archive_handle);
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| 46 | goto ret;
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| 47 | }
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| 48 | dst_name++;
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| 49 | /*
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| 50 | * Link target is shortened only for hardlinks:
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| 51 | * softlinks restored unchanged.
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| 52 | */
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| 53 | if (hard_link) {
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| 54 | // GNU tar 1.26 does not check that we reached end of link name:
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| 55 | // if "dir/hardlink" is hardlinked to "file",
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| 56 | // tar xvf a.tar --strip-components=1 says:
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| 57 | // tar: hardlink: Cannot hard link to '': No such file or directory
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| 58 | // and continues processing. We silently skip such entries.
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| 59 | hard_link = strchr(hard_link, '/');
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| 60 | if (!hard_link || hard_link[1] == '\0') {
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| 61 | data_skip(archive_handle);
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| 62 | goto ret;
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| 63 | }
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| 64 | hard_link++;
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| 65 | }
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| 66 | } while (--n != 0);
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| 67 | }
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| 68 | #endif
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| 69 |
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[2725] | 70 | if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
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[3621] | 71 | char *slash = strrchr(dst_name, '/');
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[2725] | 72 | if (slash) {
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| 73 | *slash = '\0';
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[3621] | 74 | bb_make_directory(dst_name, -1, FILEUTILS_RECUR);
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[2725] | 75 | *slash = '/';
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
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| 80 | /* Remove the entry if it exists */
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| 81 | if (!S_ISDIR(file_header->mode)) {
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[3621] | 82 | if (hard_link) {
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[2725] | 83 | /* Ugly special case:
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| 84 | * tar cf t.tar hardlink1 hardlink2 hardlink1
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| 85 | * results in this tarball structure:
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| 86 | * hardlink1
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| 87 | * hardlink2 -> hardlink1
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| 88 | * hardlink1 -> hardlink1 <== !!!
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| 89 | */
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[3621] | 90 | if (strcmp(hard_link, dst_name) == 0)
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[2725] | 91 | goto ret;
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| 92 | }
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| 93 | /* Proceed with deleting */
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[3621] | 94 | if (unlink(dst_name) == -1
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[2725] | 95 | && errno != ENOENT
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| 96 | ) {
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| 97 | bb_perror_msg_and_die("can't remove old file %s",
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[3621] | 98 | dst_name);
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[2725] | 99 | }
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| 100 | }
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| 101 | }
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| 102 | else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
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| 103 | /* Remove the existing entry if its older than the extracted entry */
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| 104 | struct stat existing_sb;
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[3621] | 105 | if (lstat(dst_name, &existing_sb) == -1) {
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[2725] | 106 | if (errno != ENOENT) {
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| 107 | bb_perror_msg_and_die("can't stat old file");
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| 108 | }
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| 109 | }
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| 110 | else if (existing_sb.st_mtime >= file_header->mtime) {
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| 111 | if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 112 | && !S_ISDIR(file_header->mode)
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| 113 | ) {
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| 114 | bb_error_msg("%s not created: newer or "
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[3621] | 115 | "same age file exists", dst_name);
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[2725] | 116 | }
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| 117 | data_skip(archive_handle);
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| 118 | goto ret;
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| 119 | }
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[3621] | 120 | else if ((unlink(dst_name) == -1) && (errno != EISDIR)) {
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[2725] | 121 | bb_perror_msg_and_die("can't remove old file %s",
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[3621] | 122 | dst_name);
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[2725] | 123 | }
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| 124 | }
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| 125 |
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[3621] | 126 | /* Handle hard links separately */
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| 127 | if (hard_link) {
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| 128 | res = link(hard_link, dst_name);
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| 129 | if (res != 0 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
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[2725] | 130 | bb_perror_msg("can't create %slink "
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| 131 | "from %s to %s", "hard",
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[3621] | 132 | dst_name,
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| 133 | hard_link);
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[2725] | 134 | }
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| 135 | /* Hardlinks have no separate mode/ownership, skip chown/chmod */
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| 136 | goto ret;
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| 137 | }
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| 138 |
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| 139 | /* Create the filesystem entry */
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| 140 | switch (file_header->mode & S_IFMT) {
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| 141 | case S_IFREG: {
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| 142 | /* Regular file */
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[3621] | 143 | char *dst_nameN;
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[2725] | 144 | int flags = O_WRONLY | O_CREAT | O_EXCL;
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| 145 | if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
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| 146 | flags = O_WRONLY | O_CREAT | O_TRUNC;
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[3621] | 147 | dst_nameN = dst_name;
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| 148 | #ifdef ARCHIVE_REPLACE_VIA_RENAME
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| 149 | if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME)
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| 150 | /* rpm-style temp file name */
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| 151 | dst_nameN = xasprintf("%s;%x", dst_name, (int)getpid());
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| 152 | #endif
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| 153 | dst_fd = xopen3(dst_nameN,
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[2725] | 154 | flags,
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| 155 | file_header->mode
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| 156 | );
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| 157 | bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
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| 158 | close(dst_fd);
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[3621] | 159 | #ifdef ARCHIVE_REPLACE_VIA_RENAME
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| 160 | if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME) {
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| 161 | xrename(dst_nameN, dst_name);
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| 162 | free(dst_nameN);
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| 163 | }
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| 164 | #endif
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[2725] | 165 | break;
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| 166 | }
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| 167 | case S_IFDIR:
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[3621] | 168 | res = mkdir(dst_name, file_header->mode);
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[2725] | 169 | if ((res == -1)
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| 170 | && (errno != EISDIR) /* btw, Linux doesn't return this */
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| 171 | && (errno != EEXIST)
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| 172 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 173 | ) {
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[3621] | 174 | bb_perror_msg("can't make dir %s", dst_name);
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[2725] | 175 | }
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| 176 | break;
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| 177 | case S_IFLNK:
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| 178 | /* Symlink */
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| 179 | //TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
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[3621] | 180 | res = symlink(file_header->link_target, dst_name);
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| 181 | if (res != 0
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[2725] | 182 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 183 | ) {
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| 184 | bb_perror_msg("can't create %slink "
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| 185 | "from %s to %s", "sym",
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[3621] | 186 | dst_name,
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[2725] | 187 | file_header->link_target);
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| 188 | }
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| 189 | break;
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| 190 | case S_IFSOCK:
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| 191 | case S_IFBLK:
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| 192 | case S_IFCHR:
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| 193 | case S_IFIFO:
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[3621] | 194 | res = mknod(dst_name, file_header->mode, file_header->device);
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[2725] | 195 | if ((res == -1)
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| 196 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 197 | ) {
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[3621] | 198 | bb_perror_msg("can't create node %s", dst_name);
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[2725] | 199 | }
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| 200 | break;
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| 201 | default:
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| 202 | bb_error_msg_and_die("unrecognized file type");
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| 203 | }
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| 204 |
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| 205 | if (!S_ISLNK(file_header->mode)) {
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| 206 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) {
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| 207 | uid_t uid = file_header->uid;
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| 208 | gid_t gid = file_header->gid;
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| 209 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
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| 210 | if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
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| 211 | if (file_header->tar__uname) {
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| 212 | //TODO: cache last name/id pair?
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| 213 | struct passwd *pwd = getpwnam(file_header->tar__uname);
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| 214 | if (pwd) uid = pwd->pw_uid;
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| 215 | }
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| 216 | if (file_header->tar__gname) {
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| 217 | struct group *grp = getgrnam(file_header->tar__gname);
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| 218 | if (grp) gid = grp->gr_gid;
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| 219 | }
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| 220 | }
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| 221 | #endif
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| 222 | /* GNU tar 1.15.1 uses chown, not lchown */
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[3621] | 223 | chown(dst_name, uid, gid);
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[2725] | 224 | }
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| 225 | /* uclibc has no lchmod, glibc is even stranger -
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| 226 | * it has lchmod which seems to do nothing!
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| 227 | * so we use chmod... */
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| 228 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
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[3621] | 229 | chmod(dst_name, file_header->mode);
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[2725] | 230 | }
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| 231 | if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
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| 232 | struct timeval t[2];
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| 233 |
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| 234 | t[1].tv_sec = t[0].tv_sec = file_header->mtime;
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| 235 | t[1].tv_usec = t[0].tv_usec = 0;
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[3621] | 236 | utimes(dst_name, t);
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[2725] | 237 | }
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| 238 | }
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| 239 |
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| 240 | ret: ;
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| 241 | #if ENABLE_FEATURE_TAR_SELINUX
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| 242 | if (sctx) {
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| 243 | /* reset the context after creating an entry */
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| 244 | setfscreatecon(NULL);
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| 245 | }
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| 246 | #endif
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| 247 | }
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