The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -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 | |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <cutils/sockets.h> |
| 23 | #include <errno.h> |
| 24 | #include <assert.h> |
| 25 | |
| 26 | #include <cutils/properties.h> |
| 27 | #include "loghack.h" |
| 28 | |
| 29 | #ifdef HAVE_LIBC_SYSTEM_PROPERTIES |
| 30 | |
| 31 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 32 | #include <sys/_system_properties.h> |
| 33 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 34 | int property_set(const char *key, const char *value) |
| 35 | { |
Brad Fitzpatrick | eb1f0c6 | 2011-03-07 13:52:21 -0800 | [diff] [blame] | 36 | return __system_property_set(key, value); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | int property_get(const char *key, char *value, const char *default_value) |
| 40 | { |
| 41 | int len; |
| 42 | |
| 43 | len = __system_property_get(key, value); |
| 44 | if(len > 0) { |
| 45 | return len; |
| 46 | } |
| 47 | |
| 48 | if(default_value) { |
| 49 | len = strlen(default_value); |
| 50 | memcpy(value, default_value, len + 1); |
| 51 | } |
| 52 | return len; |
| 53 | } |
| 54 | |
| 55 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), |
| 56 | void *cookie) |
| 57 | { |
| 58 | char name[PROP_NAME_MAX]; |
| 59 | char value[PROP_VALUE_MAX]; |
| 60 | const prop_info *pi; |
| 61 | unsigned n; |
| 62 | |
| 63 | for(n = 0; (pi = __system_property_find_nth(n)); n++) { |
| 64 | __system_property_read(pi, name, value); |
| 65 | propfn(name, value, cookie); |
| 66 | } |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | #elif defined(HAVE_SYSTEM_PROPERTY_SERVER) |
| 71 | |
| 72 | /* |
| 73 | * The Linux simulator provides a "system property server" that uses IPC |
| 74 | * to set/get/list properties. The file descriptor is shared by all |
| 75 | * threads in the process, so we use a mutex to ensure that requests |
| 76 | * from multiple threads don't get interleaved. |
| 77 | */ |
| 78 | #include <stdio.h> |
| 79 | #include <sys/types.h> |
| 80 | #include <sys/socket.h> |
| 81 | #include <sys/un.h> |
| 82 | #include <pthread.h> |
| 83 | |
| 84 | static pthread_once_t gInitOnce = PTHREAD_ONCE_INIT; |
| 85 | static pthread_mutex_t gPropertyFdLock = PTHREAD_MUTEX_INITIALIZER; |
| 86 | static int gPropFd = -1; |
| 87 | |
| 88 | /* |
| 89 | * Connect to the properties server. |
| 90 | * |
| 91 | * Returns the socket descriptor on success. |
| 92 | */ |
| 93 | static int connectToServer(const char* fileName) |
| 94 | { |
| 95 | int sock = -1; |
| 96 | int cc; |
| 97 | |
| 98 | struct sockaddr_un addr; |
| 99 | |
| 100 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 101 | if (sock < 0) { |
Steve Block | 4f07a1f | 2012-01-05 22:25:38 +0000 | [diff] [blame] | 102 | ALOGW("UNIX domain socket create failed (errno=%d)\n", errno); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 103 | return -1; |
| 104 | } |
| 105 | |
| 106 | /* connect to socket; fails if file doesn't exist */ |
| 107 | strcpy(addr.sun_path, fileName); // max 108 bytes |
| 108 | addr.sun_family = AF_UNIX; |
| 109 | cc = connect(sock, (struct sockaddr*) &addr, SUN_LEN(&addr)); |
| 110 | if (cc < 0) { |
| 111 | // ENOENT means socket file doesn't exist |
| 112 | // ECONNREFUSED means socket exists but nobody is listening |
Steve Block | 4f07a1f | 2012-01-05 22:25:38 +0000 | [diff] [blame] | 113 | //ALOGW("AF_UNIX connect failed for '%s': %s\n", |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 114 | // fileName, strerror(errno)); |
| 115 | close(sock); |
| 116 | return -1; |
| 117 | } |
| 118 | |
| 119 | return sock; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Perform one-time initialization. |
| 124 | */ |
| 125 | static void init(void) |
| 126 | { |
| 127 | assert(gPropFd == -1); |
| 128 | |
| 129 | gPropFd = connectToServer(SYSTEM_PROPERTY_PIPE_NAME); |
| 130 | if (gPropFd < 0) { |
Steve Block | 4f07a1f | 2012-01-05 22:25:38 +0000 | [diff] [blame] | 131 | //ALOGW("not connected to system property server\n"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 132 | } else { |
Steve Block | 66b6875 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 133 | //ALOGV("Connected to system property server\n"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 134 | } |
| 135 | } |
| 136 | |
| 137 | int property_get(const char *key, char *value, const char *default_value) |
| 138 | { |
| 139 | char sendBuf[1+PROPERTY_KEY_MAX]; |
| 140 | char recvBuf[1+PROPERTY_VALUE_MAX]; |
| 141 | int len = -1; |
| 142 | |
Steve Block | 66b6875 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 143 | //ALOGV("PROPERTY GET [%s]\n", key); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 144 | |
| 145 | pthread_once(&gInitOnce, init); |
| 146 | if (gPropFd < 0) { |
| 147 | /* this mimics the behavior of the device implementation */ |
| 148 | if (default_value != NULL) { |
| 149 | strcpy(value, default_value); |
| 150 | len = strlen(value); |
| 151 | } |
| 152 | return len; |
| 153 | } |
| 154 | |
| 155 | if (strlen(key) >= PROPERTY_KEY_MAX) return -1; |
| 156 | |
| 157 | memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind |
| 158 | |
| 159 | sendBuf[0] = (char) kSystemPropertyGet; |
| 160 | strcpy(sendBuf+1, key); |
| 161 | |
| 162 | pthread_mutex_lock(&gPropertyFdLock); |
| 163 | if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) { |
| 164 | pthread_mutex_unlock(&gPropertyFdLock); |
| 165 | return -1; |
| 166 | } |
| 167 | if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) { |
| 168 | pthread_mutex_unlock(&gPropertyFdLock); |
| 169 | return -1; |
| 170 | } |
| 171 | pthread_mutex_unlock(&gPropertyFdLock); |
| 172 | |
| 173 | /* first byte is 0 if value not defined, 1 if found */ |
| 174 | if (recvBuf[0] == 0) { |
| 175 | if (default_value != NULL) { |
| 176 | strcpy(value, default_value); |
| 177 | len = strlen(value); |
| 178 | } else { |
| 179 | /* |
| 180 | * If the value isn't defined, hand back an empty string and |
| 181 | * a zero length, rather than a failure. This seems wrong, |
| 182 | * since you can't tell the difference between "undefined" and |
| 183 | * "defined but empty", but it's what the device does. |
| 184 | */ |
| 185 | value[0] = '\0'; |
| 186 | len = 0; |
| 187 | } |
| 188 | } else if (recvBuf[0] == 1) { |
| 189 | strcpy(value, recvBuf+1); |
| 190 | len = strlen(value); |
| 191 | } else { |
Steve Block | 8aeb6e2 | 2012-01-06 14:13:42 +0000 | [diff] [blame] | 192 | ALOGE("Got strange response to property_get request (%d)\n", |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 193 | recvBuf[0]); |
| 194 | assert(0); |
| 195 | return -1; |
| 196 | } |
Steve Block | 66b6875 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 197 | //ALOGV("PROP [found=%d def='%s'] (%d) [%s]: [%s]\n", |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 198 | // recvBuf[0], default_value, len, key, value); |
| 199 | |
| 200 | return len; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | int property_set(const char *key, const char *value) |
| 205 | { |
| 206 | char sendBuf[1+PROPERTY_KEY_MAX+PROPERTY_VALUE_MAX]; |
| 207 | char recvBuf[1]; |
| 208 | int result = -1; |
| 209 | |
Steve Block | 66b6875 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 210 | //ALOGV("PROPERTY SET [%s]: [%s]\n", key, value); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 211 | |
| 212 | pthread_once(&gInitOnce, init); |
| 213 | if (gPropFd < 0) |
| 214 | return -1; |
| 215 | |
| 216 | if (strlen(key) >= PROPERTY_KEY_MAX) return -1; |
| 217 | if (strlen(value) >= PROPERTY_VALUE_MAX) return -1; |
| 218 | |
| 219 | memset(sendBuf, 0xdd, sizeof(sendBuf)); // placate valgrind |
| 220 | |
| 221 | sendBuf[0] = (char) kSystemPropertySet; |
| 222 | strcpy(sendBuf+1, key); |
| 223 | strcpy(sendBuf+1+PROPERTY_KEY_MAX, value); |
| 224 | |
| 225 | pthread_mutex_lock(&gPropertyFdLock); |
| 226 | if (write(gPropFd, sendBuf, sizeof(sendBuf)) != sizeof(sendBuf)) { |
| 227 | pthread_mutex_unlock(&gPropertyFdLock); |
| 228 | return -1; |
| 229 | } |
| 230 | if (read(gPropFd, recvBuf, sizeof(recvBuf)) != sizeof(recvBuf)) { |
| 231 | pthread_mutex_unlock(&gPropertyFdLock); |
| 232 | return -1; |
| 233 | } |
| 234 | pthread_mutex_unlock(&gPropertyFdLock); |
| 235 | |
| 236 | if (recvBuf[0] != 1) |
| 237 | return -1; |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), |
| 242 | void *cookie) |
| 243 | { |
Steve Block | 66b6875 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 244 | //ALOGV("PROPERTY LIST\n"); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 245 | pthread_once(&gInitOnce, init); |
| 246 | if (gPropFd < 0) |
| 247 | return -1; |
| 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | #else |
| 253 | |
| 254 | /* SUPER-cheesy place-holder implementation for Win32 */ |
| 255 | |
| 256 | #include <cutils/threads.h> |
| 257 | |
| 258 | static mutex_t env_lock = MUTEX_INITIALIZER; |
| 259 | |
| 260 | int property_get(const char *key, char *value, const char *default_value) |
| 261 | { |
| 262 | char ename[PROPERTY_KEY_MAX + 6]; |
| 263 | char *p; |
| 264 | int len; |
| 265 | |
| 266 | len = strlen(key); |
| 267 | if(len >= PROPERTY_KEY_MAX) return -1; |
| 268 | memcpy(ename, "PROP_", 5); |
| 269 | memcpy(ename + 5, key, len + 1); |
| 270 | |
| 271 | mutex_lock(&env_lock); |
| 272 | |
| 273 | p = getenv(ename); |
| 274 | if(p == 0) p = ""; |
| 275 | len = strlen(p); |
| 276 | if(len >= PROPERTY_VALUE_MAX) { |
| 277 | len = PROPERTY_VALUE_MAX - 1; |
| 278 | } |
| 279 | |
| 280 | if((len == 0) && default_value) { |
| 281 | len = strlen(default_value); |
| 282 | memcpy(value, default_value, len + 1); |
| 283 | } else { |
| 284 | memcpy(value, p, len); |
| 285 | value[len] = 0; |
| 286 | } |
| 287 | |
| 288 | mutex_unlock(&env_lock); |
| 289 | |
| 290 | return len; |
| 291 | } |
| 292 | |
| 293 | |
| 294 | int property_set(const char *key, const char *value) |
| 295 | { |
| 296 | char ename[PROPERTY_KEY_MAX + 6]; |
| 297 | char *p; |
| 298 | int len; |
| 299 | int r; |
| 300 | |
| 301 | if(strlen(value) >= PROPERTY_VALUE_MAX) return -1; |
| 302 | |
| 303 | len = strlen(key); |
| 304 | if(len >= PROPERTY_KEY_MAX) return -1; |
| 305 | memcpy(ename, "PROP_", 5); |
| 306 | memcpy(ename + 5, key, len + 1); |
| 307 | |
| 308 | mutex_lock(&env_lock); |
| 309 | #ifdef HAVE_MS_C_RUNTIME |
| 310 | { |
| 311 | char temp[256]; |
| 312 | snprintf( temp, sizeof(temp), "%s=%s", ename, value); |
| 313 | putenv(temp); |
| 314 | r = 0; |
| 315 | } |
| 316 | #else |
| 317 | r = setenv(ename, value, 1); |
| 318 | #endif |
| 319 | mutex_unlock(&env_lock); |
| 320 | |
| 321 | return r; |
| 322 | } |
| 323 | |
| 324 | int property_list(void (*propfn)(const char *key, const char *value, void *cookie), |
| 325 | void *cookie) |
| 326 | { |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | #endif |