[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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| 14 |
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| 15 | #if ENABLE_FEATURE_TAR_SELINUX
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[3232] | 16 | char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
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[2725] | 17 | if (!sctx)
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[3232] | 18 | sctx = archive_handle->tar__sctx[PAX_GLOBAL];
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[2725] | 19 | if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
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| 20 | setfscreatecon(sctx);
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[3232] | 21 | free(archive_handle->tar__sctx[PAX_NEXT_FILE]);
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| 22 | archive_handle->tar__sctx[PAX_NEXT_FILE] = NULL;
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[2725] | 23 | }
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| 24 | #endif
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| 25 |
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| 26 | if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
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| 27 | char *slash = strrchr(file_header->name, '/');
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| 28 | if (slash) {
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| 29 | *slash = '\0';
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| 30 | bb_make_directory(file_header->name, -1, FILEUTILS_RECUR);
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| 31 | *slash = '/';
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| 32 | }
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| 33 | }
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| 34 |
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| 35 | if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
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| 36 | /* Remove the entry if it exists */
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| 37 | if (!S_ISDIR(file_header->mode)) {
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| 38 | /* Is it hardlink?
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| 39 | * We encode hard links as regular files of size 0 with a symlink */
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| 40 | if (S_ISREG(file_header->mode)
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| 41 | && file_header->link_target
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| 42 | && file_header->size == 0
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| 43 | ) {
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| 44 | /* Ugly special case:
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| 45 | * tar cf t.tar hardlink1 hardlink2 hardlink1
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| 46 | * results in this tarball structure:
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| 47 | * hardlink1
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| 48 | * hardlink2 -> hardlink1
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| 49 | * hardlink1 -> hardlink1 <== !!!
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| 50 | */
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| 51 | if (strcmp(file_header->link_target, file_header->name) == 0)
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| 52 | goto ret;
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| 53 | }
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| 54 | /* Proceed with deleting */
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| 55 | if (unlink(file_header->name) == -1
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| 56 | && errno != ENOENT
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| 57 | ) {
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| 58 | bb_perror_msg_and_die("can't remove old file %s",
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| 59 | file_header->name);
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| 60 | }
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| 61 | }
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| 62 | }
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| 63 | else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
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| 64 | /* Remove the existing entry if its older than the extracted entry */
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| 65 | struct stat existing_sb;
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| 66 | if (lstat(file_header->name, &existing_sb) == -1) {
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| 67 | if (errno != ENOENT) {
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| 68 | bb_perror_msg_and_die("can't stat old file");
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| 69 | }
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| 70 | }
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| 71 | else if (existing_sb.st_mtime >= file_header->mtime) {
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| 72 | if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 73 | && !S_ISDIR(file_header->mode)
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| 74 | ) {
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| 75 | bb_error_msg("%s not created: newer or "
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| 76 | "same age file exists", file_header->name);
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| 77 | }
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| 78 | data_skip(archive_handle);
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| 79 | goto ret;
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| 80 | }
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| 81 | else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
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| 82 | bb_perror_msg_and_die("can't remove old file %s",
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| 83 | file_header->name);
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| 84 | }
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| 85 | }
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| 86 |
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| 87 | /* Handle hard links separately
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| 88 | * We encode hard links as regular files of size 0 with a symlink */
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| 89 | if (S_ISREG(file_header->mode)
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| 90 | && file_header->link_target
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| 91 | && file_header->size == 0
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| 92 | ) {
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| 93 | /* hard link */
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| 94 | res = link(file_header->link_target, file_header->name);
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| 95 | if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
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| 96 | bb_perror_msg("can't create %slink "
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| 97 | "from %s to %s", "hard",
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| 98 | file_header->name,
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| 99 | file_header->link_target);
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| 100 | }
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| 101 | /* Hardlinks have no separate mode/ownership, skip chown/chmod */
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| 102 | goto ret;
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| 103 | }
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| 104 |
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| 105 | /* Create the filesystem entry */
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| 106 | switch (file_header->mode & S_IFMT) {
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| 107 | case S_IFREG: {
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| 108 | /* Regular file */
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| 109 | int flags = O_WRONLY | O_CREAT | O_EXCL;
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| 110 | if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
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| 111 | flags = O_WRONLY | O_CREAT | O_TRUNC;
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| 112 | dst_fd = xopen3(file_header->name,
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| 113 | flags,
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| 114 | file_header->mode
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| 115 | );
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| 116 | bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
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| 117 | close(dst_fd);
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| 118 | break;
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| 119 | }
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| 120 | case S_IFDIR:
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| 121 | res = mkdir(file_header->name, file_header->mode);
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| 122 | if ((res == -1)
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| 123 | && (errno != EISDIR) /* btw, Linux doesn't return this */
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| 124 | && (errno != EEXIST)
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| 125 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 126 | ) {
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| 127 | bb_perror_msg("can't make dir %s", file_header->name);
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| 128 | }
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| 129 | break;
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| 130 | case S_IFLNK:
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| 131 | /* Symlink */
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| 132 | //TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
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| 133 | res = symlink(file_header->link_target, file_header->name);
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| 134 | if ((res == -1)
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| 135 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 136 | ) {
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| 137 | bb_perror_msg("can't create %slink "
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| 138 | "from %s to %s", "sym",
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| 139 | file_header->name,
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| 140 | file_header->link_target);
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| 141 | }
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| 142 | break;
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| 143 | case S_IFSOCK:
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| 144 | case S_IFBLK:
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| 145 | case S_IFCHR:
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| 146 | case S_IFIFO:
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| 147 | res = mknod(file_header->name, file_header->mode, file_header->device);
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| 148 | if ((res == -1)
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| 149 | && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
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| 150 | ) {
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| 151 | bb_perror_msg("can't create node %s", file_header->name);
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| 152 | }
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| 153 | break;
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| 154 | default:
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| 155 | bb_error_msg_and_die("unrecognized file type");
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| 156 | }
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| 157 |
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| 158 | if (!S_ISLNK(file_header->mode)) {
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| 159 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) {
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| 160 | uid_t uid = file_header->uid;
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| 161 | gid_t gid = file_header->gid;
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| 162 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
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| 163 | if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
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| 164 | if (file_header->tar__uname) {
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| 165 | //TODO: cache last name/id pair?
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| 166 | struct passwd *pwd = getpwnam(file_header->tar__uname);
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| 167 | if (pwd) uid = pwd->pw_uid;
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| 168 | }
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| 169 | if (file_header->tar__gname) {
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| 170 | struct group *grp = getgrnam(file_header->tar__gname);
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| 171 | if (grp) gid = grp->gr_gid;
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| 172 | }
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| 173 | }
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| 174 | #endif
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| 175 | /* GNU tar 1.15.1 uses chown, not lchown */
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| 176 | chown(file_header->name, uid, gid);
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| 177 | }
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| 178 | /* uclibc has no lchmod, glibc is even stranger -
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| 179 | * it has lchmod which seems to do nothing!
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| 180 | * so we use chmod... */
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| 181 | if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
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| 182 | chmod(file_header->name, file_header->mode);
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| 183 | }
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| 184 | if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
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| 185 | struct timeval t[2];
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| 186 |
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| 187 | t[1].tv_sec = t[0].tv_sec = file_header->mtime;
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| 188 | t[1].tv_usec = t[0].tv_usec = 0;
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| 189 | utimes(file_header->name, t);
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| 190 | }
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| 191 | }
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| 192 |
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| 193 | ret: ;
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| 194 | #if ENABLE_FEATURE_TAR_SELINUX
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| 195 | if (sctx) {
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| 196 | /* reset the context after creating an entry */
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| 197 | setfscreatecon(NULL);
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| 198 | }
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| 199 | #endif
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| 200 | }
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