b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006 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 | #define LOG_TAG "properties" |
| 18 | // #define LOG_NDEBUG 0 |
| 19 | |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <ctype.h> |
| 23 | #include <unistd.h> |
| 24 | #include <cutils/sockets.h> |
| 25 | #include <errno.h> |
| 26 | #include <assert.h> |
| 27 | |
| 28 | #include <inttypes.h> |
| 29 | #include <cutils/properties.h> |
| 30 | #include <stdbool.h> |
| 31 | #include <inttypes.h> |
| 32 | #include "loghack.h" |
| 33 | |
| 34 | int8_t property_get_bool(const char *key, int8_t default_value) { |
| 35 | if (!key) { |
| 36 | return default_value; |
| 37 | } |
| 38 | |
| 39 | int8_t result = default_value; |
| 40 | char buf[PROPERTY_VALUE_MAX] = {'\0',}; |
| 41 | |
| 42 | int len = property_get(key, buf, ""); |
| 43 | if (len == 1) { |
| 44 | char ch = buf[0]; |
| 45 | if (ch == '0' || ch == 'n') { |
| 46 | result = false; |
| 47 | } else if (ch == '1' || ch == 'y') { |
| 48 | result = true; |
| 49 | } |
| 50 | } else if (len > 1) { |
| 51 | if (!strcmp(buf, "no") || !strcmp(buf, "false") || !strcmp(buf, "off")) { |
| 52 | result = false; |
| 53 | } else if (!strcmp(buf, "yes") || !strcmp(buf, "true") || !strcmp(buf, "on")) { |
| 54 | result = true; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | return result; |
| 59 | } |
| 60 | |
| 61 | // Convert string property to int (default if fails); return default value if out of bounds |
| 62 | static intmax_t property_get_imax(const char *key, intmax_t lower_bound, intmax_t upper_bound, |
| 63 | intmax_t default_value) { |
| 64 | if (!key) { |
| 65 | return default_value; |
| 66 | } |
| 67 | |
| 68 | intmax_t result = default_value; |
| 69 | char buf[PROPERTY_VALUE_MAX] = {'\0',}; |
| 70 | char *end = NULL; |
| 71 | |
| 72 | int len = property_get(key, buf, ""); |
| 73 | if (len > 0) { |
| 74 | int tmp = errno; |
| 75 | errno = 0; |
| 76 | |
| 77 | // Infer base automatically |
| 78 | result = strtoimax(buf, &end, /*base*/0); |
| 79 | if ((result == INTMAX_MIN || result == INTMAX_MAX) && errno == ERANGE) { |
| 80 | // Over or underflow |
| 81 | result = default_value; |
| 82 | ALOGV("%s(%s,%" PRIdMAX ") - overflow", __FUNCTION__, key, default_value); |
| 83 | } else if (result < lower_bound || result > upper_bound) { |
| 84 | // Out of range of requested bounds |
| 85 | result = default_value; |
| 86 | ALOGV("%s(%s,%" PRIdMAX ") - out of range", __FUNCTION__, key, default_value); |
| 87 | } else if (end == buf) { |
| 88 | // Numeric conversion failed |
| 89 | result = default_value; |
| 90 | ALOGV("%s(%s,%" PRIdMAX ") - numeric conversion failed", |
| 91 | __FUNCTION__, key, default_value); |
| 92 | } |
| 93 | |
| 94 | errno = tmp; |
| 95 | } |
| 96 | |
| 97 | return result; |
| 98 | } |
| 99 | |
| 100 | int64_t property_get_int64(const char *key, int64_t default_value) { |
| 101 | return (int64_t)property_get_imax(key, INT64_MIN, INT64_MAX, default_value); |
| 102 | } |
| 103 | |
| 104 | int32_t property_get_int32(const char *key, int32_t default_value) { |
| 105 | return (int32_t)property_get_imax(key, INT32_MIN, INT32_MAX, default_value); |
| 106 | } |
| 107 | |
| 108 | #ifdef HAVE_LIBC_SYSTEM_PROPERTIES |
| 109 | |
| 110 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 111 | #include <sys/_system_properties.h> |
| 112 | |
| 113 | int property_set(const char *key, const char *value) |
| 114 | { |
| 115 | return __system_property_set(key, value); |
| 116 | } |
| 117 | |
| 118 | int property_get(const char *key, char *value, const char *default_value) |
| 119 | { |
| 120 | int len; |
| 121 | |
| 122 | len = __system_property_get(key, value); |
| 123 | if(len > 0) { |
| 124 | return len; |
| 125 | } |
| 126 | if(default_value) { |
| 127 | len = strlen(default_value); |
| 128 | if (len >= PROPERTY_VALUE_MAX) { |
| 129 | len = PROPERTY_VALUE_MAX - 1; |
| 130 | } |
| 131 | memcpy(value, default_value, len); |
| 132 | value[len] = '\0'; |
| 133 | } |
| 134 | return len; |
| 135 | } |
| 136 | |
| 137 | struct property_list_callback_data |
| 138 | { |
| 139 | void (*propfn)(const char *key, const char *value, void *cookie); |
| 140 | void *cookie; |
| 141 | }; |
| 142 | |
| 143 | static void property_list_callback(const prop_info *pi, void *cookie) |
| 144 | { |
| 145 | char name[PROP_NAME_MAX]; |
| 146 | char value[PROP_VALUE_MAX]; |
| 147 | struct property_list_callback_data *data = cookie; |
| 148 | |
| 149 | __system_property_read(pi, name, value); |
| 150 | data->propfn(name, value, data->cookie); |
| 151 | } |
| 152 | |
| 153 | int property_list( |
| 154 | void (*propfn)(const char *key, const char *value, void *cookie), |
| 155 | void *cookie) |
| 156 | { |
| 157 | struct property_list_callback_data data = { propfn, cookie }; |
| 158 | return __system_property_foreach(property_list_callback, &data); |
| 159 | } |
| 160 | |
| 161 | #elif defined(HAVE_SYSTEM_PROPERTY_SERVER) |
| 162 | |
| 163 | /* |
| 164 | * The Linux simulator provides a "system property server" that uses IPC |
| 165 | * to set/get/list properties. The file descriptor is shared by all |
| 166 | * threads in the process, so we use a mutex to ensure that requests |
| 167 | * from multiple threads don't get interleaved. |
| 168 | */ |
| 169 | #include <stdio.h> |
| 170 | #include <sys/types.h> |
| 171 | #include <sys/socket.h> |
| 172 | #include <sys/un.h> |
| 173 | #include <pthread.h> |
| 174 | |
| 175 | static pthread_once_t gInitOnce = PTHREAD_ONCE_INIT; |
| 176 | static pthread_mutex_t gPropertyFdLock = PTHREAD_MUTEX_INITIALIZER; |
| 177 | static int gPropFd = -1; |
| 178 | |
| 179 | /* |
| 180 | * Connect to the properties server. |
| 181 | * |
| 182 | * Returns the socket descriptor on success. |
| 183 | */ |
| 184 | static int connectToServer(const char* fileName) |
| 185 | { |
| 186 | int sock = -1; |
| 187 | int cc; |
| 188 | |
| 189 | struct sockaddr_un addr; |
| 190 | |
| 191 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 192 | if (sock < 0) { |
| 193 | ALOGW("UNIX domain socket create failed (errno=%d)\n", errno); |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | /* connect to socket; fails if file doesn't exist */ |
| 198 | strcpy(addr.sun_path, fileName); // max 108 bytes |
| 199 | addr.sun_family = AF_UNIX; |
| 200 | cc = connect(sock, (struct sockaddr*) &addr, SUN_LEN(&addr)); |
| 201 | if (cc < 0) { |
| 202 | // ENOENT means socket file doesn't exist |
| 203 | // ECONNREFUSED means socket exists but nobody is listening |
| 204 | //ALOGW("AF_UNIX connect failed for '%s': %s\n", |
| 205 | // fileName, strerror(errno)); |
| 206 | close(sock); |
| 207 | return -1; |
| 208 | } |
| 209 | |
| 210 | return sock; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Perform one-time initialization. |
| 215 | */ |
| 216 | static void init(void) |
| 217 | { |
| 218 | assert(gPropFd == -1); |
| 219 | |
| 220 | gPropFd = connectToServer(SYSTEM_PROPERTY_PIPE_NAME); |
| 221 | if (gPropFd < 0) { |
| 222 | //ALOGW("not connected to system property server\n"); |
| 223 | } else { |
| 224 | //ALOGV("Connected to system property server\n"); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | int property_get(const char *key, char *value, const char *default_value) |
| 229 | { |
| 230 | //char sendBuf[1+PROPERTY_KEY_MAX]; |
| 231 | //char recvBuf[1+PROPERTY_VALUE_MAX]; |
| 232 | //int len = -1; |
| 233 | // |
| 234 | ////ALOGV("PROPERTY GET [%s]\n", key); |
| 235 | // |
| 236 | //pthread_once(&gInitOnce, init); |
| 237 | //if (gPropFd < 0) { |
| 238 | // /* this mimics the behavior of the device implementation */ |
| 239 | // if (default_value != NULL) { |
| 240 | // strcpy(value, default_value); |
| 241 | // len = strlen(value); |
| 242 | // } |
| 243 | // return len; |
| 244 | //} |
| 245 | // |
| 246 | //if (strlen(key) >= PROPERTY_KEY_MAX) return -1; |
| 247 | // |
| 248 | //memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind |
| 249 | // |
| 250 | //sendBuf[0] = (char) kSystemPropertyGet; |
| 251 | //strcpy(sendBuf+1, key); |
| 252 | // |
| 253 | //pthread_mutex_lock(&gPropertyFdLock); |
| 254 | //if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) { |
| 255 | // pthread_mutex_unlock(&gPropertyFdLock); |
| 256 | // return -1; |
| 257 | //} |
| 258 | //if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) { |
| 259 | // pthread_mutex_unlock(&gPropertyFdLock); |
| 260 | // return -1; |
| 261 | //} |
| 262 | //pthread_mutex_unlock(&gPropertyFdLock); |
| 263 | // |
| 264 | ///* first byte is 0 if value not defined, 1 if found */ |
| 265 | //if (recvBuf[0] == 0) { |
| 266 | // if (default_value != NULL) { |
| 267 | // strcpy(value, default_value); |
| 268 | // len = strlen(value); |
| 269 | // } else { |
| 270 | // /* |
| 271 | // * If the value isn't defined, hand back an empty string and |
| 272 | // * a zero length, rather than a failure. This seems wrong, |
| 273 | // * since you can't tell the difference between "undefined" and |
| 274 | // * "defined but empty", but it's what the device does. |
| 275 | // */ |
| 276 | // value[0] = '\0'; |
| 277 | // len = 0; |
| 278 | // } |
| 279 | //} else if (recvBuf[0] == 1) { |
| 280 | // strcpy(value, recvBuf+1); |
| 281 | // len = strlen(value); |
| 282 | //} else { |
| 283 | // ALOGE("Got strange response to property_get request (%d)\n", |
| 284 | // recvBuf[0]); |
| 285 | // assert(0); |
| 286 | // return -1; |
| 287 | //} |
| 288 | ////ALOGV("PROP [found=%d def='%s'] (%d) [%s]: [%s]\n", |
| 289 | //// recvBuf[0], default_value, len, key, value); |
| 290 | // |
| 291 | //return len; |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | |
| 296 | int property_set(const char *key, const char *value) |
| 297 | { |
| 298 | //char sendBuf[1+PROPERTY_KEY_MAX+PROPERTY_VALUE_MAX]; |
| 299 | //char recvBuf[1]; |
| 300 | //int result = -1; |
| 301 | // |
| 302 | ////ALOGV("PROPERTY SET [%s]: [%s]\n", key, value); |
| 303 | // |
| 304 | //pthread_once(&gInitOnce, init); |
| 305 | //if (gPropFd < 0) |
| 306 | // return -1; |
| 307 | // |
| 308 | //if (strlen(key) >= PROPERTY_KEY_MAX) return -1; |
| 309 | //if (strlen(value) >= PROPERTY_VALUE_MAX) return -1; |
| 310 | // |
| 311 | //memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind |
| 312 | // |
| 313 | //sendBuf[0] = (char) kSystemPropertySet; |
| 314 | //strcpy(sendBuf+1, key); |
| 315 | //strcpy(sendBuf+1+PROPERTY_KEY_MAX, value); |
| 316 | // |
| 317 | //pthread_mutex_lock(&gPropertyFdLock); |
| 318 | //if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) { |
| 319 | // pthread_mutex_unlock(&gPropertyFdLock); |
| 320 | // return -1; |
| 321 | //} |
| 322 | //if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) { |
| 323 | // pthread_mutex_unlock(&gPropertyFdLock); |
| 324 | // return -1; |
| 325 | //} |
| 326 | //pthread_mutex_unlock(&gPropertyFdLock); |
| 327 | // |
| 328 | //if (recvBuf[0] != 1) |
| 329 | // return -1; |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), |
| 334 | void *cookie) |
| 335 | { |
| 336 | //ALOGV("PROPERTY LIST\n"); |
| 337 | //pthread_once(&gInitOnce, init); |
| 338 | //if (gPropFd < 0) |
| 339 | // return -1; |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | #else |
| 345 | |
| 346 | /* SUPER-cheesy place-holder implementation for Win32 */ |
| 347 | |
| 348 | //#include <cutils/threads.h> |
| 349 | |
| 350 | //static mutex_t env_lock = MUTEX_INITIALIZER; |
| 351 | |
| 352 | int property_get(const char *key, char *value, const char *default_value) |
| 353 | { |
| 354 | //char ename[PROPERTY_KEY_MAX + 6]; |
| 355 | //char *p; |
| 356 | //int len; |
| 357 | // |
| 358 | //len = strlen(key); |
| 359 | //if(len >= PROPERTY_KEY_MAX) return -1; |
| 360 | //memcpy(ename, "PROP_", 5); |
| 361 | //memcpy(ename + 5, key, len + 1); |
| 362 | // |
| 363 | //mutex_lock(&env_lock); |
| 364 | // |
| 365 | //p = getenv(ename); |
| 366 | //if(p == 0) p = ""; |
| 367 | //len = strlen(p); |
| 368 | //if(len >= PROPERTY_VALUE_MAX) { |
| 369 | // len = PROPERTY_VALUE_MAX - 1; |
| 370 | //} |
| 371 | // |
| 372 | //if((len == 0) && default_value) { |
| 373 | // len = strlen(default_value); |
| 374 | // memcpy(value, default_value, len + 1); |
| 375 | //} else { |
| 376 | // memcpy(value, p, len); |
| 377 | // value[len] = 0; |
| 378 | //} |
| 379 | // |
| 380 | //mutex_unlock(&env_lock); |
| 381 | |
| 382 | //return len; |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | int property_set(const char *key, const char *value) |
| 388 | { |
| 389 | // char ename[PROPERTY_KEY_MAX + 6]; |
| 390 | // char *p; |
| 391 | // int len; |
| 392 | // int r; |
| 393 | // |
| 394 | // if(strlen(value) >= PROPERTY_VALUE_MAX) return -1; |
| 395 | // |
| 396 | // len = strlen(key); |
| 397 | // if(len >= PROPERTY_KEY_MAX) return -1; |
| 398 | // memcpy(ename, "PROP_", 5); |
| 399 | // memcpy(ename + 5, key, len + 1); |
| 400 | // |
| 401 | // mutex_lock(&env_lock); |
| 402 | //#ifdef HAVE_MS_C_RUNTIME |
| 403 | // { |
| 404 | // char temp[256]; |
| 405 | // snprintf( temp, sizeof(temp), "%s=%s", ename, value); |
| 406 | // putenv(temp); |
| 407 | // r = 0; |
| 408 | // } |
| 409 | //#else |
| 410 | // r = setenv(ename, value, 1); |
| 411 | //#endif |
| 412 | // mutex_unlock(&env_lock); |
| 413 | // |
| 414 | // return r; |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), |
| 419 | void *cookie) |
| 420 | { |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | #endif |