Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 1 | #include "idmap.h" |
| 2 | |
| 3 | #include <UniquePtr.h> |
| 4 | #include <androidfw/AssetManager.h> |
| 5 | #include <androidfw/ResourceTypes.h> |
| 6 | #include <androidfw/ZipFileRO.h> |
| 7 | #include <utils/String8.h> |
| 8 | |
| 9 | #include <fcntl.h> |
| 10 | #include <sys/stat.h> |
| 11 | |
| 12 | using namespace android; |
| 13 | |
| 14 | namespace { |
| 15 | int get_zip_entry_crc(const char *zip_path, const char *entry_name, uint32_t *crc) |
| 16 | { |
| 17 | UniquePtr<ZipFileRO> zip(ZipFileRO::open(zip_path)); |
| 18 | if (zip.get() == NULL) { |
| 19 | return -1; |
| 20 | } |
| 21 | ZipEntryRO entry = zip->findEntryByName(entry_name); |
| 22 | if (entry == NULL) { |
| 23 | return -1; |
| 24 | } |
Andreas Gampe | cfedceb | 2014-09-30 21:48:18 -0700 | [diff] [blame] | 25 | if (!zip->getEntryInfo(entry, NULL, NULL, NULL, NULL, NULL, reinterpret_cast<long*>(crc))) { |
Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 26 | return -1; |
| 27 | } |
| 28 | zip->releaseEntry(entry); |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | int open_idmap(const char *path) |
| 33 | { |
| 34 | int fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)); |
| 35 | if (fd == -1) { |
| 36 | ALOGD("error: open %s: %s\n", path, strerror(errno)); |
| 37 | goto fail; |
| 38 | } |
| 39 | if (fchmod(fd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) < 0) { |
| 40 | ALOGD("error: fchmod %s: %s\n", path, strerror(errno)); |
| 41 | goto fail; |
| 42 | } |
| 43 | if (TEMP_FAILURE_RETRY(flock(fd, LOCK_EX | LOCK_NB)) != 0) { |
| 44 | ALOGD("error: flock %s: %s\n", path, strerror(errno)); |
| 45 | goto fail; |
| 46 | } |
| 47 | |
| 48 | return fd; |
| 49 | fail: |
| 50 | if (fd != -1) { |
| 51 | close(fd); |
| 52 | unlink(path); |
| 53 | } |
| 54 | return -1; |
| 55 | } |
| 56 | |
| 57 | int write_idmap(int fd, const uint32_t *data, size_t size) |
| 58 | { |
| 59 | if (lseek(fd, SEEK_SET, 0) < 0) { |
| 60 | return -1; |
| 61 | } |
| 62 | size_t bytesLeft = size; |
| 63 | while (bytesLeft > 0) { |
| 64 | ssize_t w = TEMP_FAILURE_RETRY(write(fd, data + size - bytesLeft, bytesLeft)); |
| 65 | if (w < 0) { |
| 66 | fprintf(stderr, "error: write: %s\n", strerror(errno)); |
| 67 | return -1; |
| 68 | } |
Andreas Gampe | cfedceb | 2014-09-30 21:48:18 -0700 | [diff] [blame] | 69 | bytesLeft -= static_cast<size_t>(w); |
Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 70 | } |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | bool is_idmap_stale_fd(const char *target_apk_path, const char *overlay_apk_path, int idmap_fd) |
| 75 | { |
| 76 | static const size_t N = ResTable::IDMAP_HEADER_SIZE_BYTES; |
| 77 | struct stat st; |
| 78 | if (fstat(idmap_fd, &st) == -1) { |
| 79 | return true; |
| 80 | } |
| 81 | if (st.st_size < N) { |
| 82 | // file is empty or corrupt |
| 83 | return true; |
| 84 | } |
| 85 | |
| 86 | char buf[N]; |
Andreas Gampe | cfedceb | 2014-09-30 21:48:18 -0700 | [diff] [blame] | 87 | size_t bytesLeft = N; |
Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 88 | if (lseek(idmap_fd, SEEK_SET, 0) < 0) { |
| 89 | return true; |
| 90 | } |
| 91 | for (;;) { |
| 92 | ssize_t r = TEMP_FAILURE_RETRY(read(idmap_fd, buf + N - bytesLeft, bytesLeft)); |
| 93 | if (r < 0) { |
| 94 | return true; |
| 95 | } |
Andreas Gampe | cfedceb | 2014-09-30 21:48:18 -0700 | [diff] [blame] | 96 | bytesLeft -= static_cast<size_t>(r); |
Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 97 | if (bytesLeft == 0) { |
| 98 | break; |
| 99 | } |
| 100 | if (r == 0) { |
| 101 | // "shouldn't happen" |
| 102 | return true; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | uint32_t cached_target_crc, cached_overlay_crc; |
| 107 | String8 cached_target_path, cached_overlay_path; |
Adam Lesinski | f90f2f8d | 2014-06-06 14:27:00 -0700 | [diff] [blame] | 108 | if (!ResTable::getIdmapInfo(buf, N, NULL, &cached_target_crc, &cached_overlay_crc, |
Colin Cross | 13221c9 | 2014-02-11 18:04:44 -0800 | [diff] [blame] | 109 | &cached_target_path, &cached_overlay_path)) { |
| 110 | return true; |
| 111 | } |
| 112 | |
| 113 | if (cached_target_path != target_apk_path) { |
| 114 | return true; |
| 115 | } |
| 116 | if (cached_overlay_path != overlay_apk_path) { |
| 117 | return true; |
| 118 | } |
| 119 | |
| 120 | uint32_t actual_target_crc, actual_overlay_crc; |
| 121 | if (get_zip_entry_crc(target_apk_path, AssetManager::RESOURCES_FILENAME, |
| 122 | &actual_target_crc) == -1) { |
| 123 | return true; |
| 124 | } |
| 125 | if (get_zip_entry_crc(overlay_apk_path, AssetManager::RESOURCES_FILENAME, |
| 126 | &actual_overlay_crc) == -1) { |
| 127 | return true; |
| 128 | } |
| 129 | |
| 130 | return cached_target_crc != actual_target_crc || cached_overlay_crc != actual_overlay_crc; |
| 131 | } |
| 132 | |
| 133 | bool is_idmap_stale_path(const char *target_apk_path, const char *overlay_apk_path, |
| 134 | const char *idmap_path) |
| 135 | { |
| 136 | struct stat st; |
| 137 | if (stat(idmap_path, &st) == -1) { |
| 138 | // non-existing idmap is always stale; on other errors, abort idmap generation |
| 139 | return errno == ENOENT; |
| 140 | } |
| 141 | |
| 142 | int idmap_fd = TEMP_FAILURE_RETRY(open(idmap_path, O_RDONLY)); |
| 143 | if (idmap_fd == -1) { |
| 144 | return false; |
| 145 | } |
| 146 | bool is_stale = is_idmap_stale_fd(target_apk_path, overlay_apk_path, idmap_fd); |
| 147 | close(idmap_fd); |
| 148 | return is_stale; |
| 149 | } |
| 150 | |
| 151 | int create_idmap(const char *target_apk_path, const char *overlay_apk_path, |
| 152 | uint32_t **data, size_t *size) |
| 153 | { |
| 154 | uint32_t target_crc, overlay_crc; |
| 155 | if (get_zip_entry_crc(target_apk_path, AssetManager::RESOURCES_FILENAME, |
| 156 | &target_crc) == -1) { |
| 157 | return -1; |
| 158 | } |
| 159 | if (get_zip_entry_crc(overlay_apk_path, AssetManager::RESOURCES_FILENAME, |
| 160 | &overlay_crc) == -1) { |
| 161 | return -1; |
| 162 | } |
| 163 | |
| 164 | AssetManager am; |
| 165 | bool b = am.createIdmap(target_apk_path, overlay_apk_path, target_crc, overlay_crc, |
| 166 | data, size); |
| 167 | return b ? 0 : -1; |
| 168 | } |
| 169 | |
| 170 | int create_and_write_idmap(const char *target_apk_path, const char *overlay_apk_path, |
| 171 | int fd, bool check_if_stale) |
| 172 | { |
| 173 | if (check_if_stale) { |
| 174 | if (!is_idmap_stale_fd(target_apk_path, overlay_apk_path, fd)) { |
| 175 | // already up to date -- nothing to do |
| 176 | return 0; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | uint32_t *data = NULL; |
| 181 | size_t size; |
| 182 | |
| 183 | if (create_idmap(target_apk_path, overlay_apk_path, &data, &size) == -1) { |
| 184 | return -1; |
| 185 | } |
| 186 | |
| 187 | if (write_idmap(fd, data, size) == -1) { |
| 188 | free(data); |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | free(data); |
| 193 | return 0; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | int idmap_create_path(const char *target_apk_path, const char *overlay_apk_path, |
| 198 | const char *idmap_path) |
| 199 | { |
| 200 | if (!is_idmap_stale_path(target_apk_path, overlay_apk_path, idmap_path)) { |
| 201 | // already up to date -- nothing to do |
| 202 | return EXIT_SUCCESS; |
| 203 | } |
| 204 | |
| 205 | int fd = open_idmap(idmap_path); |
| 206 | if (fd == -1) { |
| 207 | return EXIT_FAILURE; |
| 208 | } |
| 209 | |
| 210 | int r = create_and_write_idmap(target_apk_path, overlay_apk_path, fd, false); |
| 211 | close(fd); |
| 212 | if (r != 0) { |
| 213 | unlink(idmap_path); |
| 214 | } |
| 215 | return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE; |
| 216 | } |
| 217 | |
| 218 | int idmap_create_fd(const char *target_apk_path, const char *overlay_apk_path, int fd) |
| 219 | { |
| 220 | return create_and_write_idmap(target_apk_path, overlay_apk_path, fd, true) == 0 ? |
| 221 | EXIT_SUCCESS : EXIT_FAILURE; |
| 222 | } |