bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 1998-2003 University of Illinois Board of Trustees |
| 3 | ** Copyright 1998-2003 Mark D. Roth |
| 4 | ** All rights reserved. |
| 5 | ** |
| 6 | ** append.c - libtar code to append files to a tar archive |
| 7 | ** |
| 8 | ** Mark D. Roth <roth@uiuc.edu> |
| 9 | ** Campus Information Technologies and Educational Services |
| 10 | ** University of Illinois at Urbana-Champaign |
| 11 | */ |
| 12 | |
| 13 | #include <internal.h> |
| 14 | |
| 15 | #include <stdio.h> |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 16 | #include <stdlib.h> |
| 17 | #include <string.h> |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 18 | #include <errno.h> |
| 19 | #include <fcntl.h> |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 20 | #include <time.h> |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 21 | #include <sys/param.h> |
| 22 | #include <sys/types.h> |
Ethan Yonker | 79f88bd | 2016-12-09 14:52:12 -0600 | [diff] [blame] | 23 | #include <stdbool.h> |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 24 | |
Ethan Yonker | 7118774 | 2017-01-13 13:30:10 -0600 | [diff] [blame] | 25 | #include <sys/capability.h> |
| 26 | #include <sys/xattr.h> |
| 27 | #include <linux/xattr.h> |
| 28 | |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 29 | #ifdef STDC_HEADERS |
| 30 | # include <stdlib.h> |
| 31 | # include <string.h> |
| 32 | #endif |
| 33 | |
| 34 | #ifdef HAVE_UNISTD_H |
| 35 | # include <unistd.h> |
| 36 | #endif |
| 37 | |
Matt Mower | 8741364 | 2017-01-17 21:14:46 -0600 | [diff] [blame] | 38 | #include <selinux/selinux.h> |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 39 | |
Ethan Yonker | 79f88bd | 2016-12-09 14:52:12 -0600 | [diff] [blame] | 40 | #ifdef HAVE_EXT4_CRYPT |
| 41 | # include "ext4crypt_tar.h" |
| 42 | #endif |
Ethan Yonker | 8d039f7 | 2017-02-03 14:26:15 -0600 | [diff] [blame] | 43 | #include "android_utils.h" |
Ethan Yonker | 79f88bd | 2016-12-09 14:52:12 -0600 | [diff] [blame] | 44 | |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 45 | struct tar_dev |
| 46 | { |
| 47 | dev_t td_dev; |
| 48 | libtar_hash_t *td_h; |
| 49 | }; |
| 50 | typedef struct tar_dev tar_dev_t; |
| 51 | |
| 52 | struct tar_ino |
| 53 | { |
| 54 | ino_t ti_ino; |
| 55 | char ti_name[MAXPATHLEN]; |
| 56 | }; |
| 57 | typedef struct tar_ino tar_ino_t; |
| 58 | |
| 59 | |
| 60 | /* free memory associated with a tar_dev_t */ |
| 61 | void |
| 62 | tar_dev_free(tar_dev_t *tdp) |
| 63 | { |
| 64 | libtar_hash_free(tdp->td_h, free); |
| 65 | free(tdp); |
| 66 | } |
| 67 | |
| 68 | |
| 69 | /* appends a file to the tar archive */ |
| 70 | int |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 71 | tar_append_file(TAR *t, const char *realname, const char *savename) |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 72 | { |
| 73 | struct stat s; |
| 74 | int i; |
| 75 | libtar_hashptr_t hp; |
| 76 | tar_dev_t *td = NULL; |
| 77 | tar_ino_t *ti = NULL; |
| 78 | char path[MAXPATHLEN]; |
| 79 | |
| 80 | #ifdef DEBUG |
| 81 | printf("==> tar_append_file(TAR=0x%lx (\"%s\"), realname=\"%s\", " |
| 82 | "savename=\"%s\")\n", t, t->pathname, realname, |
| 83 | (savename ? savename : "[NULL]")); |
| 84 | #endif |
| 85 | |
| 86 | if (lstat(realname, &s) != 0) |
| 87 | { |
| 88 | #ifdef DEBUG |
| 89 | perror("lstat()"); |
| 90 | #endif |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | /* set header block */ |
| 95 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 96 | puts("tar_append_file(): setting header block..."); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 97 | #endif |
| 98 | memset(&(t->th_buf), 0, sizeof(struct tar_header)); |
| 99 | th_set_from_stat(t, &s); |
| 100 | |
| 101 | /* set the header path */ |
| 102 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 103 | puts("tar_append_file(): setting header path..."); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 104 | #endif |
| 105 | th_set_path(t, (savename ? savename : realname)); |
| 106 | |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 107 | /* get selinux context */ |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 108 | if (t->options & TAR_STORE_SELINUX) |
| 109 | { |
| 110 | if (t->th_buf.selinux_context != NULL) |
| 111 | { |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 112 | free(t->th_buf.selinux_context); |
| 113 | t->th_buf.selinux_context = NULL; |
| 114 | } |
| 115 | |
| 116 | security_context_t selinux_context = NULL; |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 117 | if (lgetfilecon(realname, &selinux_context) >= 0) |
| 118 | { |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 119 | t->th_buf.selinux_context = strdup(selinux_context); |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 120 | printf(" ==> set selinux context: %s\n", selinux_context); |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 121 | freecon(selinux_context); |
| 122 | } |
| 123 | else |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 124 | { |
| 125 | #ifdef DEBUG |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 126 | perror("Failed to get selinux context"); |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 127 | #endif |
| 128 | } |
Vojtech Bocek | 25fd68d | 2013-08-27 03:10:10 +0200 | [diff] [blame] | 129 | } |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 130 | |
Ethan Yonker | 79f88bd | 2016-12-09 14:52:12 -0600 | [diff] [blame] | 131 | #ifdef HAVE_EXT4_CRYPT |
| 132 | if (TH_ISDIR(t) && t->options & TAR_STORE_EXT4_POL) |
| 133 | { |
| 134 | if (t->th_buf.e4crypt_policy != NULL) |
| 135 | { |
| 136 | free(t->th_buf.e4crypt_policy); |
| 137 | t->th_buf.e4crypt_policy = NULL; |
| 138 | } |
| 139 | |
| 140 | char e4crypt_policy[EXT4_KEY_DESCRIPTOR_SIZE]; |
| 141 | if (e4crypt_policy_get(realname, e4crypt_policy, EXT4_KEY_DESCRIPTOR_SIZE, 0)) |
| 142 | { |
| 143 | char tar_policy[EXT4_KEY_DESCRIPTOR_SIZE]; |
| 144 | memset(tar_policy, 0, sizeof(tar_policy)); |
| 145 | char policy_hex[EXT4_KEY_DESCRIPTOR_HEX]; |
| 146 | policy_to_hex(e4crypt_policy, policy_hex); |
| 147 | if (lookup_ref_key(e4crypt_policy, &tar_policy)) { |
| 148 | printf("found policy '%s' - '%s' - '%s'\n", realname, tar_policy, policy_hex); |
| 149 | t->th_buf.e4crypt_policy = strdup(tar_policy); |
| 150 | } else { |
| 151 | printf("failed to lookup tar policy for '%s' - '%s'\n", realname, policy_hex); |
| 152 | return -1; |
| 153 | } |
| 154 | } // else no policy found, but this is not an error as not all dirs will have a policy |
| 155 | } |
| 156 | #endif |
| 157 | |
Ethan Yonker | 7118774 | 2017-01-13 13:30:10 -0600 | [diff] [blame] | 158 | /* get posix file capabilities */ |
| 159 | if (TH_ISREG(t) && t->options & TAR_STORE_POSIX_CAP) |
| 160 | { |
| 161 | if (t->th_buf.has_cap_data) |
| 162 | { |
| 163 | memset(&t->th_buf.cap_data, 0, sizeof(struct vfs_cap_data)); |
| 164 | t->th_buf.has_cap_data = 0; |
| 165 | } |
| 166 | |
| 167 | if (getxattr(realname, XATTR_NAME_CAPS, &t->th_buf.cap_data, sizeof(struct vfs_cap_data)) >= 0) |
| 168 | { |
| 169 | t->th_buf.has_cap_data = 1; |
| 170 | #if 1 //def DEBUG |
| 171 | print_caps(&t->th_buf.cap_data); |
| 172 | #endif |
| 173 | } |
| 174 | } |
| 175 | |
Ethan Yonker | 8d039f7 | 2017-02-03 14:26:15 -0600 | [diff] [blame] | 176 | /* get android user.default xattr */ |
| 177 | if (TH_ISDIR(t) && t->options & TAR_STORE_ANDROID_USER_XATTR) |
| 178 | { |
| 179 | if (getxattr(realname, "user.default", NULL, 0) >= 0) |
| 180 | { |
| 181 | t->th_buf.has_user_default = 1; |
| 182 | #if 1 //def DEBUG |
| 183 | printf("storing xattr user.default\n"); |
| 184 | #endif |
| 185 | } |
| 186 | if (getxattr(realname, "user.inode_cache", NULL, 0) >= 0) |
| 187 | { |
| 188 | t->th_buf.has_user_cache = 1; |
| 189 | #if 1 //def DEBUG |
| 190 | printf("storing xattr user.inode_cache\n"); |
| 191 | #endif |
| 192 | } |
| 193 | if (getxattr(realname, "user.inode_code_cache", NULL, 0) >= 0) |
| 194 | { |
| 195 | t->th_buf.has_user_code_cache = 1; |
| 196 | #if 1 //def DEBUG |
| 197 | printf("storing xattr user.inode_code_cache\n"); |
| 198 | #endif |
| 199 | } |
| 200 | } |
| 201 | |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 202 | /* check if it's a hardlink */ |
| 203 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 204 | puts("tar_append_file(): checking inode cache for hardlink..."); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 205 | #endif |
| 206 | libtar_hashptr_reset(&hp); |
| 207 | if (libtar_hash_getkey(t->h, &hp, &(s.st_dev), |
| 208 | (libtar_matchfunc_t)dev_match) != 0) |
| 209 | td = (tar_dev_t *)libtar_hashptr_data(&hp); |
| 210 | else |
| 211 | { |
| 212 | #ifdef DEBUG |
| 213 | printf("+++ adding hash for device (0x%lx, 0x%lx)...\n", |
| 214 | major(s.st_dev), minor(s.st_dev)); |
| 215 | #endif |
| 216 | td = (tar_dev_t *)calloc(1, sizeof(tar_dev_t)); |
| 217 | td->td_dev = s.st_dev; |
| 218 | td->td_h = libtar_hash_new(256, (libtar_hashfunc_t)ino_hash); |
| 219 | if (td->td_h == NULL) |
| 220 | return -1; |
| 221 | if (libtar_hash_add(t->h, td) == -1) |
| 222 | return -1; |
| 223 | } |
| 224 | libtar_hashptr_reset(&hp); |
| 225 | if (libtar_hash_getkey(td->td_h, &hp, &(s.st_ino), |
| 226 | (libtar_matchfunc_t)ino_match) != 0) |
| 227 | { |
| 228 | ti = (tar_ino_t *)libtar_hashptr_data(&hp); |
| 229 | #ifdef DEBUG |
| 230 | printf(" tar_append_file(): encoding hard link \"%s\" " |
| 231 | "to \"%s\"...\n", realname, ti->ti_name); |
| 232 | #endif |
| 233 | t->th_buf.typeflag = LNKTYPE; |
| 234 | th_set_link(t, ti->ti_name); |
| 235 | } |
| 236 | else |
| 237 | { |
| 238 | #ifdef DEBUG |
| 239 | printf("+++ adding entry: device (0x%lx,0x%lx), inode %ld " |
| 240 | "(\"%s\")...\n", major(s.st_dev), minor(s.st_dev), |
| 241 | s.st_ino, realname); |
| 242 | #endif |
| 243 | ti = (tar_ino_t *)calloc(1, sizeof(tar_ino_t)); |
| 244 | if (ti == NULL) |
| 245 | return -1; |
| 246 | ti->ti_ino = s.st_ino; |
| 247 | snprintf(ti->ti_name, sizeof(ti->ti_name), "%s", |
| 248 | savename ? savename : realname); |
| 249 | libtar_hash_add(td->td_h, ti); |
| 250 | } |
| 251 | |
| 252 | /* check if it's a symlink */ |
| 253 | if (TH_ISSYM(t)) |
| 254 | { |
| 255 | i = readlink(realname, path, sizeof(path)); |
| 256 | if (i == -1) |
| 257 | return -1; |
| 258 | if (i >= MAXPATHLEN) |
| 259 | i = MAXPATHLEN - 1; |
| 260 | path[i] = '\0'; |
| 261 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 262 | printf("tar_append_file(): encoding symlink \"%s\" -> " |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 263 | "\"%s\"...\n", realname, path); |
| 264 | #endif |
| 265 | th_set_link(t, path); |
| 266 | } |
| 267 | |
| 268 | /* print file info */ |
| 269 | if (t->options & TAR_VERBOSE) |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 270 | printf("%s\n", th_get_pathname(t)); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 271 | |
| 272 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 273 | puts("tar_append_file(): writing header"); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 274 | #endif |
| 275 | /* write header */ |
| 276 | if (th_write(t) != 0) |
| 277 | { |
| 278 | #ifdef DEBUG |
| 279 | printf("t->fd = %d\n", t->fd); |
| 280 | #endif |
| 281 | return -1; |
| 282 | } |
| 283 | #ifdef DEBUG |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 284 | puts("tar_append_file(): back from th_write()"); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 285 | #endif |
| 286 | |
| 287 | /* if it's a regular file, write the contents as well */ |
| 288 | if (TH_ISREG(t) && tar_append_regfile(t, realname) != 0) |
| 289 | return -1; |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | |
| 295 | /* write EOF indicator */ |
| 296 | int |
| 297 | tar_append_eof(TAR *t) |
| 298 | { |
| 299 | int i, j; |
| 300 | char block[T_BLOCKSIZE]; |
| 301 | |
| 302 | memset(&block, 0, T_BLOCKSIZE); |
| 303 | for (j = 0; j < 2; j++) |
| 304 | { |
| 305 | i = tar_block_write(t, &block); |
| 306 | if (i != T_BLOCKSIZE) |
| 307 | { |
| 308 | if (i != -1) |
| 309 | errno = EINVAL; |
| 310 | return -1; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | |
| 318 | /* add file contents to a tarchive */ |
| 319 | int |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 320 | tar_append_regfile(TAR *t, const char *realname) |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 321 | { |
| 322 | char block[T_BLOCKSIZE]; |
| 323 | int filefd; |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 324 | int64_t i, size; |
| 325 | ssize_t j; |
| 326 | int rv = -1; |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 327 | |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 328 | #if defined(O_BINARY) |
| 329 | filefd = open(realname, O_RDONLY|O_BINARY); |
| 330 | #else |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 331 | filefd = open(realname, O_RDONLY); |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 332 | #endif |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 333 | if (filefd == -1) |
| 334 | { |
| 335 | #ifdef DEBUG |
| 336 | perror("open()"); |
| 337 | #endif |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | size = th_get_size(t); |
| 342 | for (i = size; i > T_BLOCKSIZE; i -= T_BLOCKSIZE) |
| 343 | { |
| 344 | j = read(filefd, &block, T_BLOCKSIZE); |
| 345 | if (j != T_BLOCKSIZE) |
| 346 | { |
| 347 | if (j != -1) |
| 348 | errno = EINVAL; |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 349 | goto fail; |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 350 | } |
| 351 | if (tar_block_write(t, &block) == -1) |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 352 | goto fail; |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | if (i > 0) |
| 356 | { |
| 357 | j = read(filefd, &block, i); |
| 358 | if (j == -1) |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 359 | goto fail; |
| 360 | memset(&(block[i]), 0, T_BLOCKSIZE - i); |
| 361 | if (tar_block_write(t, &block) == -1) |
| 362 | goto fail; |
| 363 | } |
| 364 | |
| 365 | /* success! */ |
| 366 | rv = 0; |
| 367 | fail: |
| 368 | close(filefd); |
| 369 | |
| 370 | return rv; |
| 371 | } |
| 372 | |
| 373 | |
| 374 | /* add file contents to a tarchive */ |
| 375 | int |
| 376 | tar_append_file_contents(TAR *t, const char *savename, mode_t mode, |
| 377 | uid_t uid, gid_t gid, void *buf, size_t len) |
| 378 | { |
| 379 | struct stat st; |
| 380 | |
| 381 | memset(&st, 0, sizeof(st)); |
| 382 | st.st_mode = S_IFREG | mode; |
| 383 | st.st_uid = uid; |
| 384 | st.st_gid = gid; |
| 385 | st.st_mtime = time(NULL); |
| 386 | st.st_size = len; |
| 387 | |
| 388 | th_set_from_stat(t, &st); |
| 389 | th_set_path(t, savename); |
| 390 | |
| 391 | /* write header */ |
| 392 | if (th_write(t) != 0) |
| 393 | { |
| 394 | #ifdef DEBUG |
| 395 | fprintf(stderr, "tar_append_file_contents(): could not write header, t->fd = %d\n", t->fd); |
| 396 | #endif |
| 397 | return -1; |
| 398 | } |
| 399 | |
| 400 | return tar_append_buffer(t, buf, len); |
| 401 | } |
| 402 | |
| 403 | int |
| 404 | tar_append_buffer(TAR *t, void *buf, size_t len) |
| 405 | { |
| 406 | char block[T_BLOCKSIZE]; |
| 407 | int filefd; |
| 408 | int i, j; |
| 409 | size_t size = len; |
| 410 | |
| 411 | for (i = size; i > T_BLOCKSIZE; i -= T_BLOCKSIZE) |
| 412 | { |
| 413 | if (tar_block_write(t, buf) == -1) |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 414 | return -1; |
James Christopher Adduono | 6f57f7c | 2016-03-01 16:01:53 -0500 | [diff] [blame] | 415 | buf = (char *)buf + T_BLOCKSIZE; |
| 416 | } |
| 417 | |
| 418 | if (i > 0) |
| 419 | { |
| 420 | memcpy(block, buf, i); |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 421 | memset(&(block[i]), 0, T_BLOCKSIZE - i); |
| 422 | if (tar_block_write(t, &block) == -1) |
| 423 | return -1; |
| 424 | } |
| 425 | |
bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | |