The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 <stdarg.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <stdio.h> |
| 20 | #include <string.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <ctype.h> |
| 23 | #include <errno.h> |
Colin Cross | 504bc51 | 2010-04-13 19:35:09 -0700 | [diff] [blame] | 24 | #include <time.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 25 | |
| 26 | #include <sys/stat.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/socket.h> |
| 29 | #include <sys/un.h> |
| 30 | |
| 31 | /* for ANDROID_SOCKET_* */ |
| 32 | #include <cutils/sockets.h> |
| 33 | |
| 34 | #include <private/android_filesystem_config.h> |
| 35 | |
Colin Cross | ed8a7d8 | 2010-04-19 17:05:34 -0700 | [diff] [blame] | 36 | #include "log.h" |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 37 | #include "util.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 38 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 39 | /* |
| 40 | * android_name_to_id - returns the integer uid/gid associated with the given |
| 41 | * name, or -1U on error. |
| 42 | */ |
| 43 | static unsigned int android_name_to_id(const char *name) |
| 44 | { |
| 45 | struct android_id_info *info = android_ids; |
| 46 | unsigned int n; |
| 47 | |
| 48 | for (n = 0; n < android_id_count; n++) { |
| 49 | if (!strcmp(info[n].name, name)) |
| 50 | return info[n].aid; |
| 51 | } |
| 52 | |
| 53 | return -1U; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * decode_uid - decodes and returns the given string, which can be either the |
| 58 | * numeric or name representation, into the integer uid or gid. Returns -1U on |
| 59 | * error. |
| 60 | */ |
| 61 | unsigned int decode_uid(const char *s) |
| 62 | { |
| 63 | unsigned int v; |
| 64 | |
| 65 | if (!s || *s == '\0') |
| 66 | return -1U; |
| 67 | if (isalpha(s[0])) |
| 68 | return android_name_to_id(s); |
| 69 | |
| 70 | errno = 0; |
| 71 | v = (unsigned int) strtoul(s, 0, 0); |
| 72 | if (errno) |
| 73 | return -1U; |
| 74 | return v; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * create_socket - creates a Unix domain socket in ANDROID_SOCKET_DIR |
| 79 | * ("/dev/socket") as dictated in init.rc. This socket is inherited by the |
| 80 | * daemon. We communicate the file descriptor's value via the environment |
| 81 | * variable ANDROID_SOCKET_ENV_PREFIX<name> ("ANDROID_SOCKET_foo"). |
| 82 | */ |
| 83 | int create_socket(const char *name, int type, mode_t perm, uid_t uid, gid_t gid) |
| 84 | { |
| 85 | struct sockaddr_un addr; |
| 86 | int fd, ret; |
| 87 | |
| 88 | fd = socket(PF_UNIX, type, 0); |
| 89 | if (fd < 0) { |
| 90 | ERROR("Failed to open socket '%s': %s\n", name, strerror(errno)); |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | memset(&addr, 0 , sizeof(addr)); |
| 95 | addr.sun_family = AF_UNIX; |
| 96 | snprintf(addr.sun_path, sizeof(addr.sun_path), ANDROID_SOCKET_DIR"/%s", |
| 97 | name); |
| 98 | |
| 99 | ret = unlink(addr.sun_path); |
| 100 | if (ret != 0 && errno != ENOENT) { |
| 101 | ERROR("Failed to unlink old socket '%s': %s\n", name, strerror(errno)); |
| 102 | goto out_close; |
| 103 | } |
| 104 | |
| 105 | ret = bind(fd, (struct sockaddr *) &addr, sizeof (addr)); |
| 106 | if (ret) { |
| 107 | ERROR("Failed to bind socket '%s': %s\n", name, strerror(errno)); |
| 108 | goto out_unlink; |
| 109 | } |
| 110 | |
| 111 | chown(addr.sun_path, uid, gid); |
| 112 | chmod(addr.sun_path, perm); |
| 113 | |
| 114 | INFO("Created socket '%s' with mode '%o', user '%d', group '%d'\n", |
| 115 | addr.sun_path, perm, uid, gid); |
| 116 | |
| 117 | return fd; |
| 118 | |
| 119 | out_unlink: |
| 120 | unlink(addr.sun_path); |
| 121 | out_close: |
| 122 | close(fd); |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | /* reads a file, making sure it is terminated with \n \0 */ |
| 127 | void *read_file(const char *fn, unsigned *_sz) |
| 128 | { |
| 129 | char *data; |
| 130 | int sz; |
| 131 | int fd; |
| 132 | |
| 133 | data = 0; |
| 134 | fd = open(fn, O_RDONLY); |
| 135 | if(fd < 0) return 0; |
| 136 | |
| 137 | sz = lseek(fd, 0, SEEK_END); |
| 138 | if(sz < 0) goto oops; |
| 139 | |
| 140 | if(lseek(fd, 0, SEEK_SET) != 0) goto oops; |
| 141 | |
| 142 | data = (char*) malloc(sz + 2); |
| 143 | if(data == 0) goto oops; |
| 144 | |
| 145 | if(read(fd, data, sz) != sz) goto oops; |
| 146 | close(fd); |
| 147 | data[sz] = '\n'; |
| 148 | data[sz+1] = 0; |
| 149 | if(_sz) *_sz = sz; |
| 150 | return data; |
| 151 | |
| 152 | oops: |
| 153 | close(fd); |
| 154 | if(data != 0) free(data); |
| 155 | return 0; |
| 156 | } |
| 157 | |
Colin Cross | f24ed8c | 2010-04-12 18:51:06 -0700 | [diff] [blame] | 158 | #define MAX_MTD_PARTITIONS 16 |
| 159 | |
| 160 | static struct { |
| 161 | char name[16]; |
| 162 | int number; |
| 163 | } mtd_part_map[MAX_MTD_PARTITIONS]; |
| 164 | |
| 165 | static int mtd_part_count = -1; |
| 166 | |
| 167 | static void find_mtd_partitions(void) |
| 168 | { |
| 169 | int fd; |
| 170 | char buf[1024]; |
| 171 | char *pmtdbufp; |
| 172 | ssize_t pmtdsize; |
| 173 | int r; |
| 174 | |
| 175 | fd = open("/proc/mtd", O_RDONLY); |
| 176 | if (fd < 0) |
| 177 | return; |
| 178 | |
| 179 | buf[sizeof(buf) - 1] = '\0'; |
| 180 | pmtdsize = read(fd, buf, sizeof(buf) - 1); |
| 181 | pmtdbufp = buf; |
| 182 | while (pmtdsize > 0) { |
| 183 | int mtdnum, mtdsize, mtderasesize; |
| 184 | char mtdname[16]; |
| 185 | mtdname[0] = '\0'; |
| 186 | mtdnum = -1; |
| 187 | r = sscanf(pmtdbufp, "mtd%d: %x %x %15s", |
| 188 | &mtdnum, &mtdsize, &mtderasesize, mtdname); |
| 189 | if ((r == 4) && (mtdname[0] == '"')) { |
| 190 | char *x = strchr(mtdname + 1, '"'); |
| 191 | if (x) { |
| 192 | *x = 0; |
| 193 | } |
| 194 | INFO("mtd partition %d, %s\n", mtdnum, mtdname + 1); |
| 195 | if (mtd_part_count < MAX_MTD_PARTITIONS) { |
| 196 | strcpy(mtd_part_map[mtd_part_count].name, mtdname + 1); |
| 197 | mtd_part_map[mtd_part_count].number = mtdnum; |
| 198 | mtd_part_count++; |
| 199 | } else { |
| 200 | ERROR("too many mtd partitions\n"); |
| 201 | } |
| 202 | } |
| 203 | while (pmtdsize > 0 && *pmtdbufp != '\n') { |
| 204 | pmtdbufp++; |
| 205 | pmtdsize--; |
| 206 | } |
| 207 | if (pmtdsize > 0) { |
| 208 | pmtdbufp++; |
| 209 | pmtdsize--; |
| 210 | } |
| 211 | } |
| 212 | close(fd); |
| 213 | } |
| 214 | |
| 215 | int mtd_name_to_number(const char *name) |
| 216 | { |
| 217 | int n; |
| 218 | if (mtd_part_count < 0) { |
| 219 | mtd_part_count = 0; |
| 220 | find_mtd_partitions(); |
| 221 | } |
| 222 | for (n = 0; n < mtd_part_count; n++) { |
| 223 | if (!strcmp(name, mtd_part_map[n].name)) { |
| 224 | return mtd_part_map[n].number; |
| 225 | } |
| 226 | } |
| 227 | return -1; |
| 228 | } |
Colin Cross | 504bc51 | 2010-04-13 19:35:09 -0700 | [diff] [blame] | 229 | |
| 230 | /* |
| 231 | * gettime() - returns the time in seconds of the system's monotonic clock or |
| 232 | * zero on error. |
| 233 | */ |
| 234 | time_t gettime(void) |
| 235 | { |
| 236 | struct timespec ts; |
| 237 | int ret; |
| 238 | |
| 239 | ret = clock_gettime(CLOCK_MONOTONIC, &ts); |
| 240 | if (ret < 0) { |
| 241 | ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno)); |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | return ts.tv_sec; |
| 246 | } |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 247 | |
| 248 | int mkdir_recursive(const char *pathname, mode_t mode) |
| 249 | { |
| 250 | char buf[128]; |
| 251 | const char *slash; |
| 252 | const char *p = pathname; |
| 253 | int width; |
| 254 | int ret; |
| 255 | struct stat info; |
| 256 | |
| 257 | while ((slash = strchr(p, '/')) != NULL) { |
| 258 | width = slash - pathname; |
| 259 | p = slash + 1; |
| 260 | if (width < 0) |
| 261 | break; |
| 262 | if (width == 0) |
| 263 | continue; |
| 264 | if ((unsigned int)width > sizeof(buf) - 1) { |
| 265 | ERROR("path too long for mkdir_recursive\n"); |
| 266 | return -1; |
| 267 | } |
| 268 | memcpy(buf, pathname, width); |
| 269 | buf[width] = 0; |
| 270 | if (stat(buf, &info) != 0) { |
| 271 | ret = mkdir(buf, mode); |
| 272 | if (ret && errno != EEXIST) |
| 273 | return ret; |
| 274 | } |
| 275 | } |
| 276 | ret = mkdir(pathname, mode); |
| 277 | if (ret && errno != EEXIST) |
| 278 | return ret; |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | void sanitize(char *s) |
| 283 | { |
| 284 | if (!s) |
| 285 | return; |
| 286 | while (isalnum(*s)) |
| 287 | s++; |
| 288 | *s = 0; |
| 289 | } |
| 290 | void make_link(const char *oldpath, const char *newpath) |
| 291 | { |
| 292 | int ret; |
| 293 | char buf[256]; |
| 294 | char *slash; |
| 295 | int width; |
| 296 | |
| 297 | slash = strrchr(newpath, '/'); |
| 298 | if (!slash) |
| 299 | return; |
| 300 | width = slash - newpath; |
| 301 | if (width <= 0 || width > (int)sizeof(buf) - 1) |
| 302 | return; |
| 303 | memcpy(buf, newpath, width); |
| 304 | buf[width] = 0; |
| 305 | ret = mkdir_recursive(buf, 0755); |
| 306 | if (ret) |
| 307 | ERROR("Failed to create directory %s: %s (%d)\n", buf, strerror(errno), errno); |
| 308 | |
| 309 | ret = symlink(oldpath, newpath); |
| 310 | if (ret && errno != EEXIST) |
| 311 | ERROR("Failed to symlink %s to %s: %s (%d)\n", oldpath, newpath, strerror(errno), errno); |
| 312 | } |
| 313 | |
| 314 | void remove_link(const char *oldpath, const char *newpath) |
| 315 | { |
| 316 | char path[256]; |
| 317 | ssize_t ret; |
| 318 | ret = readlink(newpath, path, sizeof(path) - 1); |
| 319 | if (ret <= 0) |
| 320 | return; |
| 321 | path[ret] = 0; |
| 322 | if (!strcmp(path, oldpath)) |
| 323 | unlink(newpath); |
| 324 | } |
Colin Cross | cd0f173 | 2010-04-19 17:10:24 -0700 | [diff] [blame] | 325 | |
| 326 | int wait_for_file(const char *filename, int timeout) |
| 327 | { |
| 328 | struct stat info; |
| 329 | time_t timeout_time = gettime() + timeout; |
| 330 | int ret = -1; |
| 331 | |
| 332 | while (gettime() < timeout_time && ((ret = stat(filename, &info)) < 0)) |
| 333 | usleep(10000); |
| 334 | |
| 335 | return ret; |
| 336 | } |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 337 | |
| 338 | void open_devnull_stdio(void) |
| 339 | { |
| 340 | int fd; |
| 341 | static const char *name = "/dev/__null__"; |
| 342 | if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) { |
| 343 | fd = open(name, O_RDWR); |
| 344 | unlink(name); |
| 345 | if (fd >= 0) { |
| 346 | dup2(fd, 0); |
| 347 | dup2(fd, 1); |
| 348 | dup2(fd, 2); |
| 349 | if (fd > 2) { |
| 350 | close(fd); |
| 351 | } |
| 352 | return; |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | exit(1); |
| 357 | } |
| 358 | |
| 359 | void get_hardware_name(char *hardware, unsigned int *revision) |
| 360 | { |
| 361 | char data[1024]; |
| 362 | int fd, n; |
| 363 | char *x, *hw, *rev; |
| 364 | |
| 365 | /* Hardware string was provided on kernel command line */ |
| 366 | if (hardware[0]) |
| 367 | return; |
| 368 | |
| 369 | fd = open("/proc/cpuinfo", O_RDONLY); |
| 370 | if (fd < 0) return; |
| 371 | |
| 372 | n = read(fd, data, 1023); |
| 373 | close(fd); |
| 374 | if (n < 0) return; |
| 375 | |
| 376 | data[n] = 0; |
| 377 | hw = strstr(data, "\nHardware"); |
| 378 | rev = strstr(data, "\nRevision"); |
| 379 | |
| 380 | if (hw) { |
| 381 | x = strstr(hw, ": "); |
| 382 | if (x) { |
| 383 | x += 2; |
| 384 | n = 0; |
The Android Open Source Project | 742150c | 2010-07-16 13:37:09 -0700 | [diff] [blame] | 385 | while (*x && *x != '\n') { |
| 386 | if (!isspace(*x)) |
| 387 | hardware[n++] = tolower(*x); |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 388 | x++; |
| 389 | if (n == 31) break; |
| 390 | } |
| 391 | hardware[n] = 0; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | if (rev) { |
| 396 | x = strstr(rev, ": "); |
| 397 | if (x) { |
| 398 | *revision = strtoul(x + 2, 0, 16); |
| 399 | } |
| 400 | } |
| 401 | } |