The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <stdlib.h> |
| 18 | #include <stdio.h> |
| 19 | #include <string.h> |
| 20 | |
| 21 | #include <sys/stat.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <dirent.h> |
| 24 | #include <utime.h> |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 25 | #include <unistd.h> |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 26 | |
| 27 | #include <errno.h> |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 28 | #include <private/android_filesystem_config.h> |
| 29 | #include <selinux/android.h> |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 30 | #include "sysdeps.h" |
| 31 | |
| 32 | #define TRACE_TAG TRACE_SYNC |
| 33 | #include "adb.h" |
| 34 | #include "file_sync_service.h" |
| 35 | |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 36 | /* TODO: use fs_config to configure permissions on /data */ |
| 37 | static bool is_on_system(const char *name) { |
| 38 | const char *SYSTEM = "/system/"; |
| 39 | return (strncmp(SYSTEM, name, strlen(SYSTEM)) == 0); |
| 40 | } |
| 41 | |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 42 | static int mkdirs(char *name) |
| 43 | { |
| 44 | int ret; |
| 45 | char *x = name + 1; |
Nick Kralevich | 29e7813 | 2014-01-17 16:16:42 -0800 | [diff] [blame] | 46 | uid_t uid = -1; |
| 47 | gid_t gid = -1; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 48 | unsigned int mode = 0775; |
| 49 | uint64_t cap = 0; |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 50 | |
| 51 | if(name[0] != '/') return -1; |
| 52 | |
| 53 | for(;;) { |
| 54 | x = adb_dirstart(x); |
| 55 | if(x == 0) return 0; |
| 56 | *x = 0; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 57 | if (is_on_system(name)) { |
| 58 | fs_config(name, 1, &uid, &gid, &mode, &cap); |
| 59 | } |
| 60 | ret = adb_mkdir(name, mode); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 61 | if((ret < 0) && (errno != EEXIST)) { |
| 62 | D("mkdir(\"%s\") -> %s\n", name, strerror(errno)); |
| 63 | *x = '/'; |
| 64 | return ret; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 65 | } else if(ret == 0) { |
| 66 | ret = chown(name, uid, gid); |
| 67 | if (ret < 0) { |
| 68 | *x = '/'; |
| 69 | return ret; |
| 70 | } |
Stephen Smalley | 3392e9c | 2014-02-07 09:14:13 -0500 | [diff] [blame] | 71 | selinux_android_restorecon(name, 0); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 72 | } |
| 73 | *x++ = '/'; |
| 74 | } |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static int do_stat(int s, const char *path) |
| 79 | { |
| 80 | syncmsg msg; |
| 81 | struct stat st; |
| 82 | |
| 83 | msg.stat.id = ID_STAT; |
| 84 | |
| 85 | if(lstat(path, &st)) { |
| 86 | msg.stat.mode = 0; |
| 87 | msg.stat.size = 0; |
| 88 | msg.stat.time = 0; |
| 89 | } else { |
| 90 | msg.stat.mode = htoll(st.st_mode); |
| 91 | msg.stat.size = htoll(st.st_size); |
| 92 | msg.stat.time = htoll(st.st_mtime); |
| 93 | } |
| 94 | |
| 95 | return writex(s, &msg.stat, sizeof(msg.stat)); |
| 96 | } |
| 97 | |
| 98 | static int do_list(int s, const char *path) |
| 99 | { |
| 100 | DIR *d; |
| 101 | struct dirent *de; |
| 102 | struct stat st; |
| 103 | syncmsg msg; |
| 104 | int len; |
| 105 | |
| 106 | char tmp[1024 + 256 + 1]; |
| 107 | char *fname; |
| 108 | |
| 109 | len = strlen(path); |
| 110 | memcpy(tmp, path, len); |
| 111 | tmp[len] = '/'; |
| 112 | fname = tmp + len + 1; |
| 113 | |
| 114 | msg.dent.id = ID_DENT; |
| 115 | |
| 116 | d = opendir(path); |
| 117 | if(d == 0) goto done; |
| 118 | |
| 119 | while((de = readdir(d))) { |
| 120 | int len = strlen(de->d_name); |
| 121 | |
| 122 | /* not supposed to be possible, but |
| 123 | if it does happen, let's not buffer overrun */ |
| 124 | if(len > 256) continue; |
| 125 | |
| 126 | strcpy(fname, de->d_name); |
| 127 | if(lstat(tmp, &st) == 0) { |
| 128 | msg.dent.mode = htoll(st.st_mode); |
| 129 | msg.dent.size = htoll(st.st_size); |
| 130 | msg.dent.time = htoll(st.st_mtime); |
| 131 | msg.dent.namelen = htoll(len); |
| 132 | |
| 133 | if(writex(s, &msg.dent, sizeof(msg.dent)) || |
| 134 | writex(s, de->d_name, len)) { |
Elliott Hughes | 968b6a7 | 2013-10-29 14:12:46 -0700 | [diff] [blame] | 135 | closedir(d); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 136 | return -1; |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | closedir(d); |
| 142 | |
| 143 | done: |
| 144 | msg.dent.id = ID_DONE; |
| 145 | msg.dent.mode = 0; |
| 146 | msg.dent.size = 0; |
| 147 | msg.dent.time = 0; |
| 148 | msg.dent.namelen = 0; |
| 149 | return writex(s, &msg.dent, sizeof(msg.dent)); |
| 150 | } |
| 151 | |
| 152 | static int fail_message(int s, const char *reason) |
| 153 | { |
| 154 | syncmsg msg; |
| 155 | int len = strlen(reason); |
| 156 | |
| 157 | D("sync: failure: %s\n", reason); |
| 158 | |
| 159 | msg.data.id = ID_FAIL; |
| 160 | msg.data.size = htoll(len); |
| 161 | if(writex(s, &msg.data, sizeof(msg.data)) || |
| 162 | writex(s, reason, len)) { |
| 163 | return -1; |
| 164 | } else { |
| 165 | return 0; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | static int fail_errno(int s) |
| 170 | { |
| 171 | return fail_message(s, strerror(errno)); |
| 172 | } |
| 173 | |
Nick Kralevich | 29e7813 | 2014-01-17 16:16:42 -0800 | [diff] [blame] | 174 | static int handle_send_file(int s, char *path, uid_t uid, |
| 175 | gid_t gid, mode_t mode, char *buffer) |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 176 | { |
| 177 | syncmsg msg; |
| 178 | unsigned int timestamp = 0; |
| 179 | int fd; |
| 180 | |
| 181 | fd = adb_open_mode(path, O_WRONLY | O_CREAT | O_EXCL, mode); |
| 182 | if(fd < 0 && errno == ENOENT) { |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 183 | if(mkdirs(path) != 0) { |
| 184 | if(fail_errno(s)) |
| 185 | return -1; |
| 186 | fd = -1; |
| 187 | } else { |
| 188 | fd = adb_open_mode(path, O_WRONLY | O_CREAT | O_EXCL, mode); |
| 189 | } |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 190 | } |
| 191 | if(fd < 0 && errno == EEXIST) { |
| 192 | fd = adb_open_mode(path, O_WRONLY, mode); |
| 193 | } |
| 194 | if(fd < 0) { |
| 195 | if(fail_errno(s)) |
| 196 | return -1; |
| 197 | fd = -1; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 198 | } else { |
| 199 | if(fchown(fd, uid, gid) != 0) { |
| 200 | fail_errno(s); |
| 201 | errno = 0; |
| 202 | } |
Nick Kralevich | 29e7813 | 2014-01-17 16:16:42 -0800 | [diff] [blame] | 203 | |
| 204 | /* |
| 205 | * fchown clears the setuid bit - restore it if present. |
| 206 | * Ignore the result of calling fchmod. It's not supported |
| 207 | * by all filesystems. b/12441485 |
| 208 | */ |
| 209 | fchmod(fd, mode); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | for(;;) { |
| 213 | unsigned int len; |
| 214 | |
| 215 | if(readx(s, &msg.data, sizeof(msg.data))) |
| 216 | goto fail; |
| 217 | |
| 218 | if(msg.data.id != ID_DATA) { |
| 219 | if(msg.data.id == ID_DONE) { |
| 220 | timestamp = ltohl(msg.data.size); |
| 221 | break; |
| 222 | } |
| 223 | fail_message(s, "invalid data message"); |
| 224 | goto fail; |
| 225 | } |
| 226 | len = ltohl(msg.data.size); |
| 227 | if(len > SYNC_DATA_MAX) { |
| 228 | fail_message(s, "oversize data message"); |
| 229 | goto fail; |
| 230 | } |
| 231 | if(readx(s, buffer, len)) |
| 232 | goto fail; |
| 233 | |
| 234 | if(fd < 0) |
| 235 | continue; |
| 236 | if(writex(fd, buffer, len)) { |
JP Abgrall | 2e5dd6e | 2011-03-16 15:57:42 -0700 | [diff] [blame] | 237 | int saved_errno = errno; |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 238 | adb_close(fd); |
| 239 | adb_unlink(path); |
| 240 | fd = -1; |
JP Abgrall | 2e5dd6e | 2011-03-16 15:57:42 -0700 | [diff] [blame] | 241 | errno = saved_errno; |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 242 | if(fail_errno(s)) return -1; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | if(fd >= 0) { |
| 247 | struct utimbuf u; |
| 248 | adb_close(fd); |
Stephen Smalley | 3392e9c | 2014-02-07 09:14:13 -0500 | [diff] [blame] | 249 | selinux_android_restorecon(path, 0); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 250 | u.actime = timestamp; |
| 251 | u.modtime = timestamp; |
| 252 | utime(path, &u); |
| 253 | |
| 254 | msg.status.id = ID_OKAY; |
| 255 | msg.status.msglen = 0; |
| 256 | if(writex(s, &msg.status, sizeof(msg.status))) |
| 257 | return -1; |
| 258 | } |
| 259 | return 0; |
| 260 | |
| 261 | fail: |
| 262 | if(fd >= 0) |
| 263 | adb_close(fd); |
| 264 | adb_unlink(path); |
| 265 | return -1; |
| 266 | } |
| 267 | |
| 268 | #ifdef HAVE_SYMLINKS |
| 269 | static int handle_send_link(int s, char *path, char *buffer) |
| 270 | { |
| 271 | syncmsg msg; |
| 272 | unsigned int len; |
| 273 | int ret; |
| 274 | |
| 275 | if(readx(s, &msg.data, sizeof(msg.data))) |
| 276 | return -1; |
| 277 | |
| 278 | if(msg.data.id != ID_DATA) { |
| 279 | fail_message(s, "invalid data message: expected ID_DATA"); |
| 280 | return -1; |
| 281 | } |
| 282 | |
| 283 | len = ltohl(msg.data.size); |
| 284 | if(len > SYNC_DATA_MAX) { |
| 285 | fail_message(s, "oversize data message"); |
| 286 | return -1; |
| 287 | } |
| 288 | if(readx(s, buffer, len)) |
| 289 | return -1; |
| 290 | |
| 291 | ret = symlink(buffer, path); |
| 292 | if(ret && errno == ENOENT) { |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 293 | if(mkdirs(path) != 0) { |
| 294 | fail_errno(s); |
| 295 | return -1; |
| 296 | } |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 297 | ret = symlink(buffer, path); |
| 298 | } |
| 299 | if(ret) { |
| 300 | fail_errno(s); |
| 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | if(readx(s, &msg.data, sizeof(msg.data))) |
| 305 | return -1; |
| 306 | |
| 307 | if(msg.data.id == ID_DONE) { |
| 308 | msg.status.id = ID_OKAY; |
| 309 | msg.status.msglen = 0; |
| 310 | if(writex(s, &msg.status, sizeof(msg.status))) |
| 311 | return -1; |
| 312 | } else { |
| 313 | fail_message(s, "invalid data message: expected ID_DONE"); |
| 314 | return -1; |
| 315 | } |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | #endif /* HAVE_SYMLINKS */ |
| 320 | |
| 321 | static int do_send(int s, char *path, char *buffer) |
| 322 | { |
| 323 | char *tmp; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 324 | unsigned int mode; |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 325 | int is_link, ret; |
| 326 | |
| 327 | tmp = strrchr(path,','); |
| 328 | if(tmp) { |
| 329 | *tmp = 0; |
| 330 | errno = 0; |
| 331 | mode = strtoul(tmp + 1, NULL, 0); |
| 332 | #ifndef HAVE_SYMLINKS |
| 333 | is_link = 0; |
| 334 | #else |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 335 | is_link = S_ISLNK((mode_t) mode); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 336 | #endif |
| 337 | mode &= 0777; |
| 338 | } |
| 339 | if(!tmp || errno) { |
| 340 | mode = 0644; |
| 341 | is_link = 0; |
| 342 | } |
| 343 | |
| 344 | adb_unlink(path); |
| 345 | |
| 346 | |
| 347 | #ifdef HAVE_SYMLINKS |
| 348 | if(is_link) |
| 349 | ret = handle_send_link(s, path, buffer); |
| 350 | else { |
| 351 | #else |
| 352 | { |
| 353 | #endif |
Nick Kralevich | 29e7813 | 2014-01-17 16:16:42 -0800 | [diff] [blame] | 354 | uid_t uid = -1; |
| 355 | gid_t gid = -1; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 356 | uint64_t cap = 0; |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 357 | |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 358 | /* copy user permission bits to "group" and "other" permissions */ |
| 359 | mode |= ((mode >> 3) & 0070); |
| 360 | mode |= ((mode >> 3) & 0007); |
| 361 | |
Liang Cheng | 155c49a | 2014-01-02 18:27:51 -0800 | [diff] [blame] | 362 | tmp = path; |
| 363 | if(*tmp == '/') { |
| 364 | tmp++; |
| 365 | } |
| 366 | if (is_on_system(path)) { |
| 367 | fs_config(tmp, 0, &uid, &gid, &mode, &cap); |
| 368 | } |
| 369 | ret = handle_send_file(s, path, uid, gid, mode, buffer); |
The Android Open Source Project | 9ca14dc | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static int do_recv(int s, const char *path, char *buffer) |
| 376 | { |
| 377 | syncmsg msg; |
| 378 | int fd, r; |
| 379 | |
| 380 | fd = adb_open(path, O_RDONLY); |
| 381 | if(fd < 0) { |
| 382 | if(fail_errno(s)) return -1; |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | msg.data.id = ID_DATA; |
| 387 | for(;;) { |
| 388 | r = adb_read(fd, buffer, SYNC_DATA_MAX); |
| 389 | if(r <= 0) { |
| 390 | if(r == 0) break; |
| 391 | if(errno == EINTR) continue; |
| 392 | r = fail_errno(s); |
| 393 | adb_close(fd); |
| 394 | return r; |
| 395 | } |
| 396 | msg.data.size = htoll(r); |
| 397 | if(writex(s, &msg.data, sizeof(msg.data)) || |
| 398 | writex(s, buffer, r)) { |
| 399 | adb_close(fd); |
| 400 | return -1; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | adb_close(fd); |
| 405 | |
| 406 | msg.data.id = ID_DONE; |
| 407 | msg.data.size = 0; |
| 408 | if(writex(s, &msg.data, sizeof(msg.data))) { |
| 409 | return -1; |
| 410 | } |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | void file_sync_service(int fd, void *cookie) |
| 416 | { |
| 417 | syncmsg msg; |
| 418 | char name[1025]; |
| 419 | unsigned namelen; |
| 420 | |
| 421 | char *buffer = malloc(SYNC_DATA_MAX); |
| 422 | if(buffer == 0) goto fail; |
| 423 | |
| 424 | for(;;) { |
| 425 | D("sync: waiting for command\n"); |
| 426 | |
| 427 | if(readx(fd, &msg.req, sizeof(msg.req))) { |
| 428 | fail_message(fd, "command read failure"); |
| 429 | break; |
| 430 | } |
| 431 | namelen = ltohl(msg.req.namelen); |
| 432 | if(namelen > 1024) { |
| 433 | fail_message(fd, "invalid namelen"); |
| 434 | break; |
| 435 | } |
| 436 | if(readx(fd, name, namelen)) { |
| 437 | fail_message(fd, "filename read failure"); |
| 438 | break; |
| 439 | } |
| 440 | name[namelen] = 0; |
| 441 | |
| 442 | msg.req.namelen = 0; |
| 443 | D("sync: '%s' '%s'\n", (char*) &msg.req, name); |
| 444 | |
| 445 | switch(msg.req.id) { |
| 446 | case ID_STAT: |
| 447 | if(do_stat(fd, name)) goto fail; |
| 448 | break; |
| 449 | case ID_LIST: |
| 450 | if(do_list(fd, name)) goto fail; |
| 451 | break; |
| 452 | case ID_SEND: |
| 453 | if(do_send(fd, name, buffer)) goto fail; |
| 454 | break; |
| 455 | case ID_RECV: |
| 456 | if(do_recv(fd, name, buffer)) goto fail; |
| 457 | break; |
| 458 | case ID_QUIT: |
| 459 | goto fail; |
| 460 | default: |
| 461 | fail_message(fd, "unknown command"); |
| 462 | goto fail; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | fail: |
| 467 | if(buffer != 0) free(buffer); |
| 468 | D("sync: done\n"); |
| 469 | adb_close(fd); |
| 470 | } |