Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 2014, 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 <ctype.h> |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 18 | #include <pthread.h> |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 19 | #include <stdbool.h> |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 20 | #include <stdlib.h> |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 21 | #include <string.h> |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 22 | #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ |
| 23 | #include <sys/_system_properties.h> |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 24 | #include <unistd.h> |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 25 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 26 | #include <private/android_logger.h> |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 27 | |
Mark Salyzyn | 018a96d | 2016-03-01 13:45:42 -0800 | [diff] [blame] | 28 | #include "log_portability.h" |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 29 | |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 30 | static pthread_mutex_t lock_loggable = PTHREAD_MUTEX_INITIALIZER; |
| 31 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 32 | static int lock() |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 33 | { |
| 34 | /* |
| 35 | * If we trigger a signal handler in the middle of locked activity and the |
| 36 | * signal handler logs a message, we could get into a deadlock state. |
| 37 | */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 38 | /* |
| 39 | * Any contention, and we can turn around and use the non-cached method |
| 40 | * in less time than the system call associated with a mutex to deal with |
| 41 | * the contention. |
| 42 | */ |
| 43 | return pthread_mutex_trylock(&lock_loggable); |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | static void unlock() |
| 47 | { |
| 48 | pthread_mutex_unlock(&lock_loggable); |
| 49 | } |
| 50 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 51 | struct cache { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 52 | const prop_info* pinfo; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 53 | uint32_t serial; |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 54 | }; |
| 55 | |
| 56 | struct cache_char { |
| 57 | struct cache cache; |
Mark Salyzyn | b004a7f | 2015-12-08 14:52:11 -0800 | [diff] [blame] | 58 | unsigned char c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 59 | }; |
| 60 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 61 | static int check_cache(struct cache* cache) |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 62 | { |
| 63 | return cache->pinfo |
| 64 | && __system_property_serial(cache->pinfo) != cache->serial; |
| 65 | } |
| 66 | |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 67 | #define BOOLEAN_TRUE 0xFF |
| 68 | #define BOOLEAN_FALSE 0xFE |
| 69 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 70 | static void refresh_cache(struct cache_char* cache, const char* key) |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 71 | { |
| 72 | char buf[PROP_VALUE_MAX]; |
| 73 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 74 | if (!cache->cache.pinfo) { |
| 75 | cache->cache.pinfo = __system_property_find(key); |
| 76 | if (!cache->cache.pinfo) { |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 77 | return; |
| 78 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 79 | } |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 80 | cache->cache.serial = __system_property_serial(cache->cache.pinfo); |
| 81 | __system_property_read(cache->cache.pinfo, 0, buf); |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 82 | switch(buf[0]) { |
| 83 | case 't': case 'T': |
| 84 | cache->c = strcasecmp(buf + 1, "rue") ? buf[0] : BOOLEAN_TRUE; |
| 85 | break; |
| 86 | case 'f': case 'F': |
| 87 | cache->c = strcasecmp(buf + 1, "alse") ? buf[0] : BOOLEAN_FALSE; |
| 88 | break; |
| 89 | default: |
| 90 | cache->c = buf[0]; |
| 91 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 92 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 93 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 94 | static int __android_log_level(const char* tag, size_t len, int default_prio) |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 95 | { |
| 96 | /* sizeof() is used on this array below */ |
| 97 | static const char log_namespace[] = "persist.log.tag."; |
| 98 | static const size_t base_offset = 8; /* skip "persist." */ |
| 99 | /* calculate the size of our key temporary buffer */ |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 100 | const size_t taglen = tag ? len : 0; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 101 | /* sizeof(log_namespace) = strlen(log_namespace) + 1 */ |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 102 | char key[sizeof(log_namespace) + taglen]; /* may be > PROP_NAME_MAX */ |
| 103 | char* kp; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 104 | size_t i; |
| 105 | char c = 0; |
| 106 | /* |
| 107 | * Single layer cache of four properties. Priorities are: |
| 108 | * log.tag.<tag> |
| 109 | * persist.log.tag.<tag> |
| 110 | * log.tag |
| 111 | * persist.log.tag |
| 112 | * Where the missing tag matches all tags and becomes the |
| 113 | * system global default. We do not support ro.log.tag* . |
| 114 | */ |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 115 | static char last_tag[PROP_NAME_MAX]; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 116 | static uint32_t global_serial; |
Mark Salyzyn | 31ca3c3 | 2015-12-22 10:49:02 -0800 | [diff] [blame] | 117 | /* some compilers erroneously see uninitialized use. !not_locked */ |
| 118 | uint32_t current_global_serial = 0; |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 119 | static struct cache_char tag_cache[2]; |
| 120 | static struct cache_char global_cache[2]; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 121 | int change_detected; |
| 122 | int global_change_detected; |
| 123 | int not_locked; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 124 | |
| 125 | strcpy(key, log_namespace); |
| 126 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 127 | global_change_detected = change_detected = not_locked = lock(); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 128 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 129 | if (!not_locked) { |
| 130 | /* |
| 131 | * check all known serial numbers to changes. |
| 132 | */ |
| 133 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 134 | if (check_cache(&tag_cache[i].cache)) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 135 | change_detected = 1; |
| 136 | } |
| 137 | } |
| 138 | for (i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 139 | if (check_cache(&global_cache[i].cache)) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 140 | global_change_detected = 1; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | current_global_serial = __system_property_area_serial(); |
| 145 | if (current_global_serial != global_serial) { |
| 146 | change_detected = 1; |
| 147 | global_change_detected = 1; |
| 148 | } |
| 149 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 150 | |
| 151 | if (taglen) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 152 | int local_change_detected = change_detected; |
| 153 | if (!not_locked) { |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 154 | if (!last_tag[0] |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 155 | || (last_tag[0] != tag[0]) |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 156 | || strncmp(last_tag + 1, tag + 1, |
| 157 | (len < sizeof(last_tag)) ? |
| 158 | (len - 1) : |
| 159 | (sizeof(last_tag) - 1)) |
| 160 | || ((len < sizeof(last_tag)) && last_tag[len])) { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 161 | /* invalidate log.tag.<tag> cache */ |
| 162 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 163 | tag_cache[i].cache.pinfo = NULL; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 164 | tag_cache[i].c = '\0'; |
| 165 | } |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 166 | last_tag[0] = '\0'; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 167 | local_change_detected = 1; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 168 | } |
Colin Cross | 7a106f7 | 2016-01-29 16:21:31 -0800 | [diff] [blame] | 169 | if (!last_tag[0]) { |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 170 | if (len < sizeof(last_tag)) { |
| 171 | strncpy(last_tag, tag, len); |
| 172 | last_tag[len] = '\0'; |
| 173 | } else { |
| 174 | strncpy(last_tag, tag, sizeof(last_tag)); |
| 175 | } |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 176 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 177 | } |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 178 | strncpy(key + sizeof(log_namespace) - 1, tag, len); |
| 179 | key[sizeof(log_namespace) - 1 + len] = '\0'; |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 180 | |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 181 | kp = key; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 182 | for (i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 183 | struct cache_char* cache = &tag_cache[i]; |
| 184 | struct cache_char temp_cache; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 185 | |
| 186 | if (not_locked) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 187 | temp_cache.cache.pinfo = NULL; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 188 | temp_cache.c = '\0'; |
| 189 | cache = &temp_cache; |
| 190 | } |
| 191 | if (local_change_detected) { |
| 192 | refresh_cache(cache, kp); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 195 | if (cache->c) { |
| 196 | c = cache->c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 197 | break; |
| 198 | } |
| 199 | |
| 200 | kp = key + base_offset; |
Mark Salyzyn | 1f028b2 | 2014-10-08 15:58:40 -0700 | [diff] [blame] | 201 | } |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 202 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 203 | |
| 204 | switch (toupper(c)) { /* if invalid, resort to global */ |
| 205 | case 'V': |
| 206 | case 'D': |
| 207 | case 'I': |
| 208 | case 'W': |
| 209 | case 'E': |
| 210 | case 'F': /* Not officially supported */ |
| 211 | case 'A': |
| 212 | case 'S': |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 213 | case BOOLEAN_FALSE: /* Not officially supported */ |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 214 | break; |
| 215 | default: |
| 216 | /* clear '.' after log.tag */ |
| 217 | key[sizeof(log_namespace) - 2] = '\0'; |
| 218 | |
| 219 | kp = key; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 220 | for (i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 221 | struct cache_char* cache = &global_cache[i]; |
| 222 | struct cache_char temp_cache; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 223 | |
| 224 | if (not_locked) { |
| 225 | temp_cache = *cache; |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 226 | if (temp_cache.cache.pinfo != cache->cache.pinfo) { /* check atomic */ |
| 227 | temp_cache.cache.pinfo = NULL; |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 228 | temp_cache.c = '\0'; |
| 229 | } |
| 230 | cache = &temp_cache; |
| 231 | } |
| 232 | if (global_change_detected) { |
| 233 | refresh_cache(cache, kp); |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 236 | if (cache->c) { |
| 237 | c = cache->c; |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 238 | break; |
| 239 | } |
| 240 | |
| 241 | kp = key + base_offset; |
| 242 | } |
| 243 | break; |
| 244 | } |
| 245 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 246 | if (!not_locked) { |
| 247 | global_serial = current_global_serial; |
| 248 | unlock(); |
| 249 | } |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 250 | |
| 251 | switch (toupper(c)) { |
| 252 | case 'V': return ANDROID_LOG_VERBOSE; |
| 253 | case 'D': return ANDROID_LOG_DEBUG; |
| 254 | case 'I': return ANDROID_LOG_INFO; |
| 255 | case 'W': return ANDROID_LOG_WARN; |
| 256 | case 'E': return ANDROID_LOG_ERROR; |
| 257 | case 'F': /* FALLTHRU */ /* Not officially supported */ |
| 258 | case 'A': return ANDROID_LOG_FATAL; |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 259 | case BOOLEAN_FALSE: /* FALLTHRU */ /* Not Officially supported */ |
Mark Salyzyn | c158456 | 2015-03-12 15:46:29 -0700 | [diff] [blame] | 260 | case 'S': return -1; /* ANDROID_LOG_SUPPRESS */ |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 261 | } |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 262 | return default_prio; |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 265 | LIBLOG_ABI_PUBLIC int __android_log_is_loggable_len(int prio, |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 266 | const char* tag, size_t len, |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 267 | int default_prio) |
| 268 | { |
| 269 | int logLevel = __android_log_level(tag, len, default_prio); |
| 270 | return logLevel >= 0 && prio >= logLevel; |
| 271 | } |
| 272 | |
| 273 | LIBLOG_ABI_PUBLIC int __android_log_is_loggable(int prio, |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 274 | const char* tag, |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 275 | int default_prio) |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 276 | { |
Mark Salyzyn | 807e40e | 2016-09-22 09:56:51 -0700 | [diff] [blame] | 277 | int logLevel = __android_log_level(tag, |
| 278 | (tag && *tag) ? strlen(tag) : 0, |
| 279 | default_prio); |
Mark Salyzyn | 9568705 | 2014-10-02 11:12:28 -0700 | [diff] [blame] | 280 | return logLevel >= 0 && prio >= logLevel; |
| 281 | } |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 282 | |
Mark Salyzyn | 9ea359f | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 283 | LIBLOG_ABI_PRIVATE int __android_log_is_debuggable() |
Mark Salyzyn | 7ef5249 | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 284 | { |
| 285 | static uint32_t serial; |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 286 | static struct cache_char tag_cache; |
Mark Salyzyn | 7ef5249 | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 287 | static const char key[] = "ro.debuggable"; |
| 288 | int ret; |
| 289 | |
| 290 | if (tag_cache.c) { /* ro property does not change after set */ |
| 291 | ret = tag_cache.c == '1'; |
| 292 | } else if (lock()) { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 293 | struct cache_char temp_cache = { { NULL, -1 }, '\0' }; |
Mark Salyzyn | 7ef5249 | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 294 | refresh_cache(&temp_cache, key); |
| 295 | ret = temp_cache.c == '1'; |
| 296 | } else { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 297 | int change_detected = check_cache(&tag_cache.cache); |
Mark Salyzyn | 7ef5249 | 2016-03-25 15:50:46 -0700 | [diff] [blame] | 298 | uint32_t current_serial = __system_property_area_serial(); |
| 299 | if (current_serial != serial) { |
| 300 | change_detected = 1; |
| 301 | } |
| 302 | if (change_detected) { |
| 303 | refresh_cache(&tag_cache, key); |
| 304 | serial = current_serial; |
| 305 | } |
| 306 | ret = tag_cache.c == '1'; |
| 307 | |
| 308 | unlock(); |
| 309 | } |
| 310 | |
| 311 | return ret; |
| 312 | } |
| 313 | |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 314 | /* |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 315 | * For properties that are read often, but generally remain constant. |
| 316 | * Since a change is rare, we will accept a trylock failure gracefully. |
| 317 | * Use a separate lock from is_loggable to keep contention down b/25563384. |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 318 | */ |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 319 | struct cache2_char { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 320 | pthread_mutex_t lock; |
| 321 | uint32_t serial; |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 322 | const char* key_persist; |
| 323 | struct cache_char cache_persist; |
| 324 | const char* key_ro; |
| 325 | struct cache_char cache_ro; |
| 326 | unsigned char (*const evaluate)(const struct cache2_char *self); |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 327 | }; |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 328 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 329 | static inline unsigned char do_cache2_char(struct cache2_char *self) |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 330 | { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 331 | uint32_t current_serial; |
| 332 | int change_detected; |
| 333 | unsigned char c; |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 334 | |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 335 | if (pthread_mutex_trylock(&self->lock)) { |
Mark Salyzyn | 2d2e0a5 | 2015-11-06 12:26:52 -0800 | [diff] [blame] | 336 | /* We are willing to accept some race in this context */ |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 337 | return self->evaluate(self); |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 338 | } |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 339 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 340 | change_detected = check_cache(&self->cache_persist.cache) |
| 341 | || check_cache(&self->cache_ro.cache); |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 342 | current_serial = __system_property_area_serial(); |
| 343 | if (current_serial != self->serial) { |
| 344 | change_detected = 1; |
| 345 | } |
| 346 | if (change_detected) { |
| 347 | refresh_cache(&self->cache_persist, self->key_persist); |
| 348 | refresh_cache(&self->cache_ro, self->key_ro); |
| 349 | self->serial = current_serial; |
| 350 | } |
| 351 | c = self->evaluate(self); |
| 352 | |
| 353 | pthread_mutex_unlock(&self->lock); |
| 354 | |
| 355 | return c; |
| 356 | } |
| 357 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 358 | static unsigned char evaluate_persist_ro(const struct cache2_char *self) |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 359 | { |
| 360 | unsigned char c = self->cache_persist.c; |
| 361 | |
| 362 | if (c) { |
| 363 | return c; |
| 364 | } |
| 365 | |
| 366 | return self->cache_ro.c; |
Mark Salyzyn | 500afc7 | 2015-09-08 08:32:01 -0700 | [diff] [blame] | 367 | } |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 368 | |
| 369 | /* |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 370 | * Timestamp state generally remains constant, but can change at any time |
| 371 | * to handle developer requirements. |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 372 | */ |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 373 | LIBLOG_ABI_PUBLIC clockid_t android_log_clockid() |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 374 | { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 375 | static struct cache2_char clockid = { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 376 | PTHREAD_MUTEX_INITIALIZER, |
| 377 | 0, |
| 378 | "persist.logd.timestamp", |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 379 | { { NULL, -1 }, '\0' }, |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 380 | "ro.logd.timestamp", |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 381 | { { NULL, -1 }, '\0' }, |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 382 | evaluate_persist_ro |
| 383 | }; |
| 384 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 385 | return (tolower(do_cache2_char(&clockid)) == 'm') |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 386 | ? CLOCK_MONOTONIC |
| 387 | : CLOCK_REALTIME; |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * Security state generally remains constant, but the DO must be able |
| 392 | * to turn off logging should it become spammy after an attack is detected. |
| 393 | */ |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 394 | static unsigned char evaluate_security(const struct cache2_char *self) |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 395 | { |
| 396 | unsigned char c = self->cache_ro.c; |
| 397 | |
| 398 | return (c != BOOLEAN_FALSE) && c && (self->cache_persist.c == BOOLEAN_TRUE); |
| 399 | } |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 400 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 401 | LIBLOG_ABI_PUBLIC int __android_log_security() |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 402 | { |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 403 | static struct cache2_char security = { |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 404 | PTHREAD_MUTEX_INITIALIZER, |
| 405 | 0, |
| 406 | "persist.logd.security", |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 407 | { { NULL, -1 }, BOOLEAN_FALSE }, |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 408 | "ro.device_owner", |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 409 | { { NULL, -1 }, BOOLEAN_FALSE }, |
Mark Salyzyn | a67d8a5 | 2015-12-21 12:32:48 -0800 | [diff] [blame] | 410 | evaluate_security |
| 411 | }; |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 412 | |
Mark Salyzyn | e455373 | 2016-09-26 13:21:05 -0700 | [diff] [blame] | 413 | return do_cache2_char(&security); |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * Interface that represents the logd buffer size determination so that others |
| 418 | * need not guess our intentions. |
| 419 | */ |
| 420 | |
| 421 | /* Property helper */ |
| 422 | static bool check_flag(const char* prop, const char* flag) { |
| 423 | const char* cp = strcasestr(prop, flag); |
| 424 | if (!cp) { |
| 425 | return false; |
| 426 | } |
| 427 | /* We only will document comma (,) */ |
| 428 | static const char sep[] = ",:;|+ \t\f"; |
| 429 | if ((cp != prop) && !strchr(sep, cp[-1])) { |
| 430 | return false; |
| 431 | } |
| 432 | cp += strlen(flag); |
| 433 | return !*cp || !!strchr(sep, *cp); |
| 434 | } |
| 435 | |
| 436 | /* cache structure */ |
| 437 | struct cache_property { |
| 438 | struct cache cache; |
| 439 | char property[PROP_VALUE_MAX]; |
| 440 | }; |
| 441 | |
| 442 | static void refresh_cache_property(struct cache_property* cache, const char* key) |
| 443 | { |
| 444 | if (!cache->cache.pinfo) { |
| 445 | cache->cache.pinfo = __system_property_find(key); |
| 446 | if (!cache->cache.pinfo) { |
| 447 | return; |
| 448 | } |
| 449 | } |
| 450 | cache->cache.serial = __system_property_serial(cache->cache.pinfo); |
| 451 | __system_property_read(cache->cache.pinfo, 0, cache->property); |
| 452 | } |
| 453 | |
| 454 | /* get boolean with the logger twist that supports eng adjustments */ |
| 455 | LIBLOG_ABI_PRIVATE bool __android_logger_property_get_bool(const char* key, |
| 456 | int flag) |
| 457 | { |
| 458 | struct cache_property property = { { NULL, -1 }, { 0 } }; |
| 459 | if (flag & BOOL_DEFAULT_FLAG_PERSIST) { |
| 460 | char newkey[PROP_NAME_MAX]; |
| 461 | snprintf(newkey, sizeof(newkey), "ro.%s", key); |
| 462 | refresh_cache_property(&property, newkey); |
| 463 | property.cache.pinfo = NULL; |
| 464 | property.cache.serial = -1; |
| 465 | snprintf(newkey, sizeof(newkey), "persist.%s", key); |
| 466 | refresh_cache_property(&property, newkey); |
| 467 | property.cache.pinfo = NULL; |
| 468 | property.cache.serial = -1; |
| 469 | } |
| 470 | |
| 471 | refresh_cache_property(&property, key); |
| 472 | |
| 473 | if (check_flag(property.property, "true")) { |
| 474 | return true; |
| 475 | } |
| 476 | if (check_flag(property.property, "false")) { |
| 477 | return false; |
| 478 | } |
| 479 | if (check_flag(property.property, "eng")) { |
| 480 | flag |= BOOL_DEFAULT_FLAG_ENG; |
| 481 | } |
| 482 | /* this is really a "not" flag */ |
| 483 | if (check_flag(property.property, "svelte")) { |
| 484 | flag |= BOOL_DEFAULT_FLAG_SVELTE; |
| 485 | } |
| 486 | |
| 487 | /* Sanity Check */ |
| 488 | if (flag & (BOOL_DEFAULT_FLAG_SVELTE | BOOL_DEFAULT_FLAG_ENG)) { |
| 489 | flag &= ~BOOL_DEFAULT_FLAG_TRUE_FALSE; |
| 490 | flag |= BOOL_DEFAULT_TRUE; |
| 491 | } |
| 492 | |
| 493 | if ((flag & BOOL_DEFAULT_FLAG_SVELTE) |
| 494 | && __android_logger_property_get_bool("ro.config.low_ram", |
| 495 | BOOL_DEFAULT_FALSE)) { |
| 496 | return false; |
| 497 | } |
| 498 | if ((flag & BOOL_DEFAULT_FLAG_ENG) && !__android_log_is_debuggable()) { |
| 499 | return false; |
| 500 | } |
| 501 | |
| 502 | return (flag & BOOL_DEFAULT_FLAG_TRUE_FALSE) != BOOL_DEFAULT_FALSE; |
| 503 | } |
| 504 | |
| 505 | LIBLOG_ABI_PRIVATE bool __android_logger_valid_buffer_size(unsigned long value) |
| 506 | { |
| 507 | static long pages, pagesize; |
| 508 | unsigned long maximum; |
| 509 | |
| 510 | if ((value < LOG_BUFFER_MIN_SIZE) || (LOG_BUFFER_MAX_SIZE < value)) { |
| 511 | return false; |
| 512 | } |
| 513 | |
| 514 | if (!pages) { |
| 515 | pages = sysconf(_SC_PHYS_PAGES); |
| 516 | } |
| 517 | if (pages < 1) { |
| 518 | return true; |
| 519 | } |
| 520 | |
| 521 | if (!pagesize) { |
| 522 | pagesize = sysconf(_SC_PAGESIZE); |
| 523 | if (pagesize <= 1) { |
| 524 | pagesize = PAGE_SIZE; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* maximum memory impact a somewhat arbitrary ~3% */ |
| 529 | pages = (pages + 31) / 32; |
| 530 | maximum = pages * pagesize; |
| 531 | |
| 532 | if ((maximum < LOG_BUFFER_MIN_SIZE) || (LOG_BUFFER_MAX_SIZE < maximum)) { |
| 533 | return true; |
| 534 | } |
| 535 | |
| 536 | return value <= maximum; |
| 537 | } |
| 538 | |
| 539 | struct cache2_property_size { |
| 540 | pthread_mutex_t lock; |
| 541 | uint32_t serial; |
| 542 | const char* key_persist; |
| 543 | struct cache_property cache_persist; |
| 544 | const char* key_ro; |
| 545 | struct cache_property cache_ro; |
| 546 | unsigned long (*const evaluate)(const struct cache2_property_size* self); |
| 547 | }; |
| 548 | |
| 549 | static inline unsigned long do_cache2_property_size(struct cache2_property_size* self) |
| 550 | { |
| 551 | uint32_t current_serial; |
| 552 | int change_detected; |
| 553 | unsigned long v; |
| 554 | |
| 555 | if (pthread_mutex_trylock(&self->lock)) { |
| 556 | /* We are willing to accept some race in this context */ |
| 557 | return self->evaluate(self); |
| 558 | } |
| 559 | |
| 560 | change_detected = check_cache(&self->cache_persist.cache) |
| 561 | || check_cache(&self->cache_ro.cache); |
| 562 | current_serial = __system_property_area_serial(); |
| 563 | if (current_serial != self->serial) { |
| 564 | change_detected = 1; |
| 565 | } |
| 566 | if (change_detected) { |
| 567 | refresh_cache_property(&self->cache_persist, self->key_persist); |
| 568 | refresh_cache_property(&self->cache_ro, self->key_ro); |
| 569 | self->serial = current_serial; |
| 570 | } |
| 571 | v = self->evaluate(self); |
| 572 | |
| 573 | pthread_mutex_unlock(&self->lock); |
| 574 | |
| 575 | return v; |
| 576 | } |
| 577 | |
| 578 | static unsigned long property_get_size_from_cache(const struct cache_property* cache) |
| 579 | { |
| 580 | char* cp; |
| 581 | unsigned long value = strtoul(cache->property, &cp, 10); |
| 582 | |
| 583 | switch(*cp) { |
| 584 | case 'm': |
| 585 | case 'M': |
| 586 | value *= 1024; |
| 587 | /* FALLTHRU */ |
| 588 | case 'k': |
| 589 | case 'K': |
| 590 | value *= 1024; |
| 591 | /* FALLTHRU */ |
| 592 | case '\0': |
| 593 | break; |
| 594 | |
| 595 | default: |
| 596 | value = 0; |
| 597 | } |
| 598 | |
| 599 | if (!__android_logger_valid_buffer_size(value)) { |
| 600 | value = 0; |
| 601 | } |
| 602 | |
| 603 | return value; |
| 604 | } |
| 605 | |
| 606 | static unsigned long evaluate_property_get_size(const struct cache2_property_size* self) |
| 607 | { |
| 608 | unsigned long size = property_get_size_from_cache(&self->cache_persist); |
| 609 | if (size) { |
| 610 | return size; |
| 611 | } |
| 612 | return property_get_size_from_cache(&self->cache_ro); |
| 613 | } |
| 614 | |
| 615 | LIBLOG_ABI_PRIVATE unsigned long __android_logger_get_buffer_size(log_id_t logId) |
| 616 | { |
| 617 | static const char global_tunable[] = "persist.logd.size"; /* Settings App */ |
| 618 | static const char global_default[] = "ro.logd.size"; /* BoardConfig.mk */ |
| 619 | static struct cache2_property_size global = { |
| 620 | PTHREAD_MUTEX_INITIALIZER, |
| 621 | 0, |
| 622 | global_tunable, |
| 623 | { { NULL, -1 }, {} }, |
| 624 | global_default, |
| 625 | { { NULL, -1 }, {} }, |
| 626 | evaluate_property_get_size |
| 627 | }; |
| 628 | char key_persist[PROP_NAME_MAX]; |
| 629 | char key_ro[PROP_NAME_MAX]; |
| 630 | struct cache2_property_size local = { |
| 631 | PTHREAD_MUTEX_INITIALIZER, |
| 632 | 0, |
| 633 | key_persist, |
| 634 | { { NULL, -1 }, {} }, |
| 635 | key_ro, |
| 636 | { { NULL, -1 }, {} }, |
| 637 | evaluate_property_get_size |
| 638 | }; |
| 639 | unsigned long property_size, default_size; |
| 640 | |
| 641 | default_size = do_cache2_property_size(&global); |
| 642 | if (!default_size) { |
| 643 | default_size = __android_logger_property_get_bool("ro.config.low_ram", |
| 644 | BOOL_DEFAULT_FALSE) |
| 645 | ? LOG_BUFFER_MIN_SIZE /* 64K */ |
| 646 | : LOG_BUFFER_SIZE; /* 256K */ |
| 647 | } |
| 648 | |
| 649 | snprintf(key_persist, sizeof(key_persist), "%s.%s", |
| 650 | global_tunable, android_log_id_to_name(logId)); |
| 651 | snprintf(key_ro, sizeof(key_ro), "%s.%s", |
| 652 | global_default, android_log_id_to_name(logId)); |
| 653 | property_size = do_cache2_property_size(&local); |
| 654 | |
| 655 | if (!property_size) { |
| 656 | property_size = default_size; |
| 657 | } |
| 658 | |
| 659 | if (!property_size) { |
| 660 | property_size = LOG_BUFFER_SIZE; |
| 661 | } |
| 662 | |
| 663 | return property_size; |
Mark Salyzyn | ffbd86f | 2015-12-04 10:59:45 -0800 | [diff] [blame] | 664 | } |