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> |
Nick Kralevich | ae76f6d | 2013-07-11 15:38:26 -0700 | [diff] [blame] | 25 | #include <ftw.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 26 | |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 27 | #include <selinux/label.h> |
Stephen Smalley | dbd37f2 | 2014-01-28 10:34:09 -0500 | [diff] [blame] | 28 | #include <selinux/android.h> |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 29 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 30 | #include <sys/stat.h> |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/socket.h> |
| 33 | #include <sys/un.h> |
| 34 | |
Dan Albert | c007bc3 | 2015-03-16 10:08:46 -0700 | [diff] [blame] | 35 | #include <base/file.h> |
Elliott Hughes | e5ce30f | 2015-05-06 19:19:24 -0700 | [diff] [blame] | 36 | #include <base/strings.h> |
Dan Albert | c007bc3 | 2015-03-16 10:08:46 -0700 | [diff] [blame] | 37 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 38 | /* for ANDROID_SOCKET_* */ |
| 39 | #include <cutils/sockets.h> |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 40 | #include <base/stringprintf.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 41 | |
| 42 | #include <private/android_filesystem_config.h> |
| 43 | |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 44 | #include "init.h" |
Colin Cross | ed8a7d8 | 2010-04-19 17:05:34 -0700 | [diff] [blame] | 45 | #include "log.h" |
Tom Cherry | b734990 | 2015-08-26 11:43:36 -0700 | [diff] [blame] | 46 | #include "property_service.h" |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 47 | #include "util.h" |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 48 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 49 | /* |
| 50 | * android_name_to_id - returns the integer uid/gid associated with the given |
Nick Kralevich | d2104df | 2015-06-18 17:46:54 -0700 | [diff] [blame] | 51 | * name, or UINT_MAX on error. |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 52 | */ |
| 53 | static unsigned int android_name_to_id(const char *name) |
| 54 | { |
Edwin Vane | de7f1ad | 2012-07-26 14:09:13 -0400 | [diff] [blame] | 55 | const struct android_id_info *info = android_ids; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 56 | unsigned int n; |
| 57 | |
| 58 | for (n = 0; n < android_id_count; n++) { |
| 59 | if (!strcmp(info[n].name, name)) |
| 60 | return info[n].aid; |
| 61 | } |
| 62 | |
Nick Kralevich | d2104df | 2015-06-18 17:46:54 -0700 | [diff] [blame] | 63 | return UINT_MAX; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 64 | } |
| 65 | |
Nick Kralevich | d2104df | 2015-06-18 17:46:54 -0700 | [diff] [blame] | 66 | static unsigned int do_decode_uid(const char *s) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 67 | { |
| 68 | unsigned int v; |
| 69 | |
| 70 | if (!s || *s == '\0') |
Nick Kralevich | d2104df | 2015-06-18 17:46:54 -0700 | [diff] [blame] | 71 | return UINT_MAX; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 72 | if (isalpha(s[0])) |
| 73 | return android_name_to_id(s); |
| 74 | |
| 75 | errno = 0; |
| 76 | v = (unsigned int) strtoul(s, 0, 0); |
| 77 | if (errno) |
Nick Kralevich | d2104df | 2015-06-18 17:46:54 -0700 | [diff] [blame] | 78 | return UINT_MAX; |
| 79 | return v; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * decode_uid - decodes and returns the given string, which can be either the |
| 84 | * numeric or name representation, into the integer uid or gid. Returns |
| 85 | * UINT_MAX on error. |
| 86 | */ |
| 87 | unsigned int decode_uid(const char *s) { |
| 88 | unsigned int v = do_decode_uid(s); |
| 89 | if (v == UINT_MAX) { |
| 90 | ERROR("decode_uid: Unable to find UID for '%s'. Returning UINT_MAX\n", s); |
| 91 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 92 | return v; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * create_socket - creates a Unix domain socket in ANDROID_SOCKET_DIR |
| 97 | * ("/dev/socket") as dictated in init.rc. This socket is inherited by the |
| 98 | * daemon. We communicate the file descriptor's value via the environment |
| 99 | * variable ANDROID_SOCKET_ENV_PREFIX<name> ("ANDROID_SOCKET_foo"). |
| 100 | */ |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 101 | int create_socket(const char *name, int type, mode_t perm, uid_t uid, |
| 102 | gid_t gid, const char *socketcon) |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 103 | { |
| 104 | struct sockaddr_un addr; |
| 105 | int fd, ret; |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 106 | char *filecon; |
| 107 | |
| 108 | if (socketcon) |
| 109 | setsockcreatecon(socketcon); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 110 | |
| 111 | fd = socket(PF_UNIX, type, 0); |
| 112 | if (fd < 0) { |
| 113 | ERROR("Failed to open socket '%s': %s\n", name, strerror(errno)); |
| 114 | return -1; |
| 115 | } |
| 116 | |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 117 | if (socketcon) |
| 118 | setsockcreatecon(NULL); |
| 119 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 120 | memset(&addr, 0 , sizeof(addr)); |
| 121 | addr.sun_family = AF_UNIX; |
| 122 | snprintf(addr.sun_path, sizeof(addr.sun_path), ANDROID_SOCKET_DIR"/%s", |
| 123 | name); |
| 124 | |
| 125 | ret = unlink(addr.sun_path); |
| 126 | if (ret != 0 && errno != ENOENT) { |
| 127 | ERROR("Failed to unlink old socket '%s': %s\n", name, strerror(errno)); |
| 128 | goto out_close; |
| 129 | } |
| 130 | |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 131 | filecon = NULL; |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 132 | if (sehandle) { |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 133 | ret = selabel_lookup(sehandle, &filecon, addr.sun_path, S_IFSOCK); |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 134 | if (ret == 0) |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 135 | setfscreatecon(filecon); |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 136 | } |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 137 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 138 | ret = bind(fd, (struct sockaddr *) &addr, sizeof (addr)); |
| 139 | if (ret) { |
| 140 | ERROR("Failed to bind socket '%s': %s\n", name, strerror(errno)); |
| 141 | goto out_unlink; |
| 142 | } |
| 143 | |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 144 | setfscreatecon(NULL); |
Stephen Smalley | 8348d27 | 2013-05-13 12:37:04 -0400 | [diff] [blame] | 145 | freecon(filecon); |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 146 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 147 | chown(addr.sun_path, uid, gid); |
| 148 | chmod(addr.sun_path, perm); |
| 149 | |
| 150 | INFO("Created socket '%s' with mode '%o', user '%d', group '%d'\n", |
| 151 | addr.sun_path, perm, uid, gid); |
| 152 | |
| 153 | return fd; |
| 154 | |
| 155 | out_unlink: |
| 156 | unlink(addr.sun_path); |
| 157 | out_close: |
| 158 | close(fd); |
| 159 | return -1; |
| 160 | } |
| 161 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 162 | bool read_file(const char* path, std::string* content) { |
| 163 | content->clear(); |
| 164 | |
| 165 | int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY|O_NOFOLLOW|O_CLOEXEC)); |
| 166 | if (fd == -1) { |
| 167 | return false; |
| 168 | } |
| 169 | |
| 170 | // For security reasons, disallow world-writable |
| 171 | // or group-writable files. |
Nick Kralevich | 38f368c | 2012-01-18 10:39:01 -0800 | [diff] [blame] | 172 | struct stat sb; |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 173 | if (fstat(fd, &sb) == -1) { |
| 174 | ERROR("fstat failed for '%s': %s\n", path, strerror(errno)); |
| 175 | return false; |
Nick Kralevich | 38f368c | 2012-01-18 10:39:01 -0800 | [diff] [blame] | 176 | } |
| 177 | if ((sb.st_mode & (S_IWGRP | S_IWOTH)) != 0) { |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 178 | ERROR("skipping insecure file '%s'\n", path); |
| 179 | return false; |
Nick Kralevich | 38f368c | 2012-01-18 10:39:01 -0800 | [diff] [blame] | 180 | } |
| 181 | |
Dan Albert | c007bc3 | 2015-03-16 10:08:46 -0700 | [diff] [blame] | 182 | bool okay = android::base::ReadFdToString(fd, content); |
Elliott Hughes | 9fc8343 | 2015-05-15 19:16:40 -0700 | [diff] [blame] | 183 | close(fd); |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 184 | return okay; |
| 185 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 186 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 187 | int write_file(const char* path, const char* content) { |
| 188 | int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY|O_CREAT|O_NOFOLLOW|O_CLOEXEC, 0600)); |
| 189 | if (fd == -1) { |
Nick Kralevich | eedbe81 | 2015-04-25 14:10:03 -0700 | [diff] [blame] | 190 | NOTICE("write_file: Unable to open '%s': %s\n", path, strerror(errno)); |
| 191 | return -1; |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 192 | } |
Nick Kralevich | eedbe81 | 2015-04-25 14:10:03 -0700 | [diff] [blame] | 193 | int result = android::base::WriteStringToFd(content, fd) ? 0 : -1; |
| 194 | if (result == -1) { |
| 195 | NOTICE("write_file: Unable to write to '%s': %s\n", path, strerror(errno)); |
| 196 | } |
Elliott Hughes | 9fc8343 | 2015-05-15 19:16:40 -0700 | [diff] [blame] | 197 | close(fd); |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 198 | return result; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 199 | } |
| 200 | |
Colin Cross | f24ed8c | 2010-04-12 18:51:06 -0700 | [diff] [blame] | 201 | #define MAX_MTD_PARTITIONS 16 |
| 202 | |
| 203 | static struct { |
| 204 | char name[16]; |
| 205 | int number; |
| 206 | } mtd_part_map[MAX_MTD_PARTITIONS]; |
| 207 | |
| 208 | static int mtd_part_count = -1; |
| 209 | |
| 210 | static void find_mtd_partitions(void) |
| 211 | { |
| 212 | int fd; |
| 213 | char buf[1024]; |
| 214 | char *pmtdbufp; |
| 215 | ssize_t pmtdsize; |
| 216 | int r; |
| 217 | |
Nick Kralevich | 45a884f | 2015-02-02 14:37:22 -0800 | [diff] [blame] | 218 | fd = open("/proc/mtd", O_RDONLY|O_CLOEXEC); |
Colin Cross | f24ed8c | 2010-04-12 18:51:06 -0700 | [diff] [blame] | 219 | if (fd < 0) |
| 220 | return; |
| 221 | |
| 222 | buf[sizeof(buf) - 1] = '\0'; |
| 223 | pmtdsize = read(fd, buf, sizeof(buf) - 1); |
| 224 | pmtdbufp = buf; |
| 225 | while (pmtdsize > 0) { |
| 226 | int mtdnum, mtdsize, mtderasesize; |
| 227 | char mtdname[16]; |
| 228 | mtdname[0] = '\0'; |
| 229 | mtdnum = -1; |
| 230 | r = sscanf(pmtdbufp, "mtd%d: %x %x %15s", |
| 231 | &mtdnum, &mtdsize, &mtderasesize, mtdname); |
| 232 | if ((r == 4) && (mtdname[0] == '"')) { |
| 233 | char *x = strchr(mtdname + 1, '"'); |
| 234 | if (x) { |
| 235 | *x = 0; |
| 236 | } |
| 237 | INFO("mtd partition %d, %s\n", mtdnum, mtdname + 1); |
| 238 | if (mtd_part_count < MAX_MTD_PARTITIONS) { |
| 239 | strcpy(mtd_part_map[mtd_part_count].name, mtdname + 1); |
| 240 | mtd_part_map[mtd_part_count].number = mtdnum; |
| 241 | mtd_part_count++; |
| 242 | } else { |
| 243 | ERROR("too many mtd partitions\n"); |
| 244 | } |
| 245 | } |
| 246 | while (pmtdsize > 0 && *pmtdbufp != '\n') { |
| 247 | pmtdbufp++; |
| 248 | pmtdsize--; |
| 249 | } |
| 250 | if (pmtdsize > 0) { |
| 251 | pmtdbufp++; |
| 252 | pmtdsize--; |
| 253 | } |
| 254 | } |
| 255 | close(fd); |
| 256 | } |
| 257 | |
| 258 | int mtd_name_to_number(const char *name) |
| 259 | { |
| 260 | int n; |
| 261 | if (mtd_part_count < 0) { |
| 262 | mtd_part_count = 0; |
| 263 | find_mtd_partitions(); |
| 264 | } |
| 265 | for (n = 0; n < mtd_part_count; n++) { |
| 266 | if (!strcmp(name, mtd_part_map[n].name)) { |
| 267 | return mtd_part_map[n].number; |
| 268 | } |
| 269 | } |
| 270 | return -1; |
| 271 | } |
Colin Cross | 504bc51 | 2010-04-13 19:35:09 -0700 | [diff] [blame] | 272 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 273 | time_t gettime() { |
| 274 | timespec now; |
| 275 | clock_gettime(CLOCK_MONOTONIC, &now); |
| 276 | return now.tv_sec; |
| 277 | } |
Colin Cross | 504bc51 | 2010-04-13 19:35:09 -0700 | [diff] [blame] | 278 | |
Elliott Hughes | da40c00 | 2015-03-27 23:20:44 -0700 | [diff] [blame] | 279 | uint64_t gettime_ns() { |
| 280 | timespec now; |
| 281 | clock_gettime(CLOCK_MONOTONIC, &now); |
| 282 | return static_cast<uint64_t>(now.tv_sec) * UINT64_C(1000000000) + now.tv_nsec; |
Colin Cross | 504bc51 | 2010-04-13 19:35:09 -0700 | [diff] [blame] | 283 | } |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 284 | |
| 285 | int mkdir_recursive(const char *pathname, mode_t mode) |
| 286 | { |
| 287 | char buf[128]; |
| 288 | const char *slash; |
| 289 | const char *p = pathname; |
| 290 | int width; |
| 291 | int ret; |
| 292 | struct stat info; |
| 293 | |
| 294 | while ((slash = strchr(p, '/')) != NULL) { |
| 295 | width = slash - pathname; |
| 296 | p = slash + 1; |
| 297 | if (width < 0) |
| 298 | break; |
| 299 | if (width == 0) |
| 300 | continue; |
| 301 | if ((unsigned int)width > sizeof(buf) - 1) { |
| 302 | ERROR("path too long for mkdir_recursive\n"); |
| 303 | return -1; |
| 304 | } |
| 305 | memcpy(buf, pathname, width); |
| 306 | buf[width] = 0; |
| 307 | if (stat(buf, &info) != 0) { |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 308 | ret = make_dir(buf, mode); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 309 | if (ret && errno != EEXIST) |
| 310 | return ret; |
| 311 | } |
| 312 | } |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 313 | ret = make_dir(pathname, mode); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 314 | if (ret && errno != EEXIST) |
| 315 | return ret; |
| 316 | return 0; |
| 317 | } |
| 318 | |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 319 | /* |
| 320 | * replaces any unacceptable characters with '_', the |
| 321 | * length of the resulting string is equal to the input string |
| 322 | */ |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 323 | void sanitize(char *s) |
| 324 | { |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 325 | const char* accept = |
| 326 | "abcdefghijklmnopqrstuvwxyz" |
| 327 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 328 | "0123456789" |
| 329 | "_-."; |
| 330 | |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 331 | if (!s) |
| 332 | return; |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 333 | |
Christopher R. Palmer | 07f3fee | 2014-09-22 14:35:54 -0400 | [diff] [blame] | 334 | while (*s) { |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 335 | s += strspn(s, accept); |
Christopher R. Palmer | 07f3fee | 2014-09-22 14:35:54 -0400 | [diff] [blame] | 336 | if (*s) *s++ = '_'; |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 337 | } |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 338 | } |
Johan Redestig | 93ca79b | 2012-04-18 16:41:19 +0200 | [diff] [blame] | 339 | |
Chris Fries | 79f3384 | 2013-09-05 13:19:21 -0500 | [diff] [blame] | 340 | void make_link_init(const char *oldpath, const char *newpath) |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 341 | { |
| 342 | int ret; |
| 343 | char buf[256]; |
| 344 | char *slash; |
| 345 | int width; |
| 346 | |
| 347 | slash = strrchr(newpath, '/'); |
| 348 | if (!slash) |
| 349 | return; |
| 350 | width = slash - newpath; |
| 351 | if (width <= 0 || width > (int)sizeof(buf) - 1) |
| 352 | return; |
| 353 | memcpy(buf, newpath, width); |
| 354 | buf[width] = 0; |
| 355 | ret = mkdir_recursive(buf, 0755); |
| 356 | if (ret) |
| 357 | ERROR("Failed to create directory %s: %s (%d)\n", buf, strerror(errno), errno); |
| 358 | |
| 359 | ret = symlink(oldpath, newpath); |
| 360 | if (ret && errno != EEXIST) |
| 361 | ERROR("Failed to symlink %s to %s: %s (%d)\n", oldpath, newpath, strerror(errno), errno); |
| 362 | } |
| 363 | |
| 364 | void remove_link(const char *oldpath, const char *newpath) |
| 365 | { |
| 366 | char path[256]; |
| 367 | ssize_t ret; |
| 368 | ret = readlink(newpath, path, sizeof(path) - 1); |
| 369 | if (ret <= 0) |
| 370 | return; |
| 371 | path[ret] = 0; |
| 372 | if (!strcmp(path, oldpath)) |
| 373 | unlink(newpath); |
| 374 | } |
Colin Cross | cd0f173 | 2010-04-19 17:10:24 -0700 | [diff] [blame] | 375 | |
| 376 | int wait_for_file(const char *filename, int timeout) |
| 377 | { |
| 378 | struct stat info; |
Thierry Strudel | 91cf41c | 2015-05-22 15:56:14 -0700 | [diff] [blame] | 379 | uint64_t timeout_time_ns = gettime_ns() + timeout * UINT64_C(1000000000); |
Colin Cross | cd0f173 | 2010-04-19 17:10:24 -0700 | [diff] [blame] | 380 | int ret = -1; |
| 381 | |
Thierry Strudel | 91cf41c | 2015-05-22 15:56:14 -0700 | [diff] [blame] | 382 | while (gettime_ns() < timeout_time_ns && ((ret = stat(filename, &info)) < 0)) |
Colin Cross | cd0f173 | 2010-04-19 17:10:24 -0700 | [diff] [blame] | 383 | usleep(10000); |
| 384 | |
| 385 | return ret; |
| 386 | } |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 387 | |
| 388 | void open_devnull_stdio(void) |
| 389 | { |
Nick Kralevich | e34577c | 2015-04-25 16:24:53 -0700 | [diff] [blame] | 390 | // Try to avoid the mknod() call if we can. Since SELinux makes |
| 391 | // a /dev/null replacement available for free, let's use it. |
| 392 | int fd = open("/sys/fs/selinux/null", O_RDWR); |
| 393 | if (fd == -1) { |
| 394 | // OOPS, /sys/fs/selinux/null isn't available, likely because |
| 395 | // /sys/fs/selinux isn't mounted. Fall back to mknod. |
| 396 | static const char *name = "/dev/__null__"; |
| 397 | if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) { |
| 398 | fd = open(name, O_RDWR); |
| 399 | unlink(name); |
| 400 | } |
| 401 | if (fd == -1) { |
| 402 | exit(1); |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 403 | } |
| 404 | } |
| 405 | |
Nick Kralevich | e34577c | 2015-04-25 16:24:53 -0700 | [diff] [blame] | 406 | dup2(fd, 0); |
| 407 | dup2(fd, 1); |
| 408 | dup2(fd, 2); |
| 409 | if (fd > 2) { |
| 410 | close(fd); |
| 411 | } |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 412 | } |
| 413 | |
Elliott Hughes | e5ce30f | 2015-05-06 19:19:24 -0700 | [diff] [blame] | 414 | void import_kernel_cmdline(bool in_qemu, |
| 415 | std::function<void(const std::string&, const std::string&, bool)> fn) { |
| 416 | std::string cmdline; |
| 417 | android::base::ReadFileToString("/proc/cmdline", &cmdline); |
Vladimir Chtchetkine | 2b99543 | 2011-09-28 09:55:31 -0700 | [diff] [blame] | 418 | |
Elliott Hughes | e5ce30f | 2015-05-06 19:19:24 -0700 | [diff] [blame] | 419 | for (const auto& entry : android::base::Split(android::base::Trim(cmdline), " ")) { |
| 420 | std::vector<std::string> pieces = android::base::Split(entry, "="); |
| 421 | if (pieces.size() == 2) { |
| 422 | fn(pieces[0], pieces[1], in_qemu); |
| 423 | } |
Vladimir Chtchetkine | 2b99543 | 2011-09-28 09:55:31 -0700 | [diff] [blame] | 424 | } |
| 425 | } |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 426 | |
| 427 | int make_dir(const char *path, mode_t mode) |
| 428 | { |
| 429 | int rc; |
| 430 | |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 431 | char *secontext = NULL; |
| 432 | |
| 433 | if (sehandle) { |
| 434 | selabel_lookup(sehandle, &secontext, path, mode); |
| 435 | setfscreatecon(secontext); |
| 436 | } |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 437 | |
| 438 | rc = mkdir(path, mode); |
| 439 | |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 440 | if (secontext) { |
| 441 | int save_errno = errno; |
| 442 | freecon(secontext); |
| 443 | setfscreatecon(NULL); |
| 444 | errno = save_errno; |
| 445 | } |
Kenny Root | b5982bf | 2012-10-16 23:07:05 -0700 | [diff] [blame] | 446 | |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 447 | return rc; |
| 448 | } |
| 449 | |
Stephen Smalley | dbd37f2 | 2014-01-28 10:34:09 -0500 | [diff] [blame] | 450 | int restorecon(const char* pathname) |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 451 | { |
Stephen Smalley | 27a9365 | 2014-02-07 09:14:13 -0500 | [diff] [blame] | 452 | return selinux_android_restorecon(pathname, 0); |
Nick Kralevich | ae76f6d | 2013-07-11 15:38:26 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | int restorecon_recursive(const char* pathname) |
| 456 | { |
Stephen Smalley | 27a9365 | 2014-02-07 09:14:13 -0500 | [diff] [blame] | 457 | return selinux_android_restorecon(pathname, SELINUX_ANDROID_RESTORECON_RECURSE); |
Nick Kralevich | ae76f6d | 2013-07-11 15:38:26 -0700 | [diff] [blame] | 458 | } |
Andres Morales | db5f5d4 | 2015-05-08 08:30:33 -0700 | [diff] [blame] | 459 | |
| 460 | /* |
| 461 | * Writes hex_len hex characters (1/2 byte) to hex from bytes. |
| 462 | */ |
| 463 | std::string bytes_to_hex(const uint8_t* bytes, size_t bytes_len) { |
| 464 | std::string hex("0x"); |
| 465 | for (size_t i = 0; i < bytes_len; i++) |
| 466 | android::base::StringAppendF(&hex, "%02x", bytes[i]); |
| 467 | return hex; |
| 468 | } |
Lee Campbell | f13b1b3 | 2015-07-24 16:57:14 -0700 | [diff] [blame] | 469 | |
| 470 | /* |
| 471 | * Returns true is pathname is a directory |
| 472 | */ |
| 473 | bool is_dir(const char* pathname) { |
| 474 | struct stat info; |
| 475 | if (stat(pathname, &info) == -1) { |
| 476 | return false; |
| 477 | } |
| 478 | return S_ISDIR(info.st_mode); |
| 479 | } |
Tom Cherry | b734990 | 2015-08-26 11:43:36 -0700 | [diff] [blame] | 480 | |
| 481 | bool expand_props(const std::string& src, std::string* dst) { |
| 482 | const char* src_ptr = src.c_str(); |
| 483 | |
| 484 | if (!dst) { |
| 485 | return false; |
| 486 | } |
| 487 | |
| 488 | /* - variables can either be $x.y or ${x.y}, in case they are only part |
| 489 | * of the string. |
| 490 | * - will accept $$ as a literal $. |
| 491 | * - no nested property expansion, i.e. ${foo.${bar}} is not supported, |
| 492 | * bad things will happen |
| 493 | */ |
| 494 | while (*src_ptr) { |
| 495 | const char* c; |
| 496 | |
| 497 | c = strchr(src_ptr, '$'); |
| 498 | if (!c) { |
| 499 | dst->append(src_ptr); |
| 500 | return true; |
| 501 | } |
| 502 | |
| 503 | dst->append(src_ptr, c); |
| 504 | c++; |
| 505 | |
| 506 | if (*c == '$') { |
| 507 | dst->push_back(*(c++)); |
| 508 | src_ptr = c; |
| 509 | continue; |
| 510 | } else if (*c == '\0') { |
| 511 | return true; |
| 512 | } |
| 513 | |
| 514 | std::string prop_name; |
| 515 | if (*c == '{') { |
| 516 | c++; |
| 517 | const char* end = strchr(c, '}'); |
| 518 | if (!end) { |
| 519 | // failed to find closing brace, abort. |
| 520 | ERROR("unexpected end of string in '%s', looking for }\n", src.c_str()); |
| 521 | return false; |
| 522 | } |
| 523 | prop_name = std::string(c, end); |
| 524 | c = end + 1; |
| 525 | } else { |
| 526 | prop_name = c; |
| 527 | ERROR("using deprecated syntax for specifying property '%s', use ${name} instead\n", |
| 528 | c); |
| 529 | c += prop_name.size(); |
| 530 | } |
| 531 | |
| 532 | if (prop_name.empty()) { |
| 533 | ERROR("invalid zero-length prop name in '%s'\n", src.c_str()); |
| 534 | return false; |
| 535 | } |
| 536 | |
| 537 | std::string prop_val = property_get(prop_name.c_str()); |
| 538 | if (prop_val.empty()) { |
| 539 | ERROR("property '%s' doesn't exist while expanding '%s'\n", |
| 540 | prop_name.c_str(), src.c_str()); |
| 541 | return false; |
| 542 | } |
| 543 | |
| 544 | dst->append(prop_val); |
| 545 | src_ptr = c; |
| 546 | } |
| 547 | |
| 548 | return true; |
| 549 | } |