1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: t -*-
3 * Copyright (c) 2005-2008, The Android Open Source Project
4 * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
6 * Licensed under the Apache License, Version 2.0 (the License);
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
24 #include <logcommon.h>
25 #include "loglimiter.h"
26 #include "logconfig.h"
30 #define DEFAULT_CONFIG_LIMITER 0
31 #define DEFAULT_CONFIG_PLOG 1
32 #define DEFAULT_CONFIG_DEBUGMODE 0
34 static int __write_to_log_null(log_id_t, log_priority, const char *, const char *);
37 * @brief Points to a function which writes a log message
38 * @details The function pointed to depends on the backend used
39 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
40 * @param[in] prio Priority of the message.
41 * @param[in] tag The message tag, identifies the sender.
42 * @param[in] msg The contents of the message.
43 * @return Returns the number of bytes written on success and a negative error value on error.
44 * @see __dlog_init_backend
46 int (*write_to_log)(log_id_t log_id, log_priority prio, const char *tag, const char *msg) = __write_to_log_null;
47 pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
48 extern void __dlog_init_pipe();
49 extern void __dlog_init_android();
54 static int fatal_assert;
58 * @details Ignores a log
59 * @param[in] log_id ID of the buffer to log to. Belongs to (LOG_ID_INVALID, LOG_ID_MAX) non-inclusive
60 * @param[in] prio Priority of the message.
61 * @param[in] tag The message tag, identifies the sender.
62 * @param[in] msg The contents of the message.
63 * @return DLOG_ERROR_NOT_PERMITTED
65 static int __write_to_log_null(log_id_t log_id, log_priority prio, const char *tag, const char *msg)// LCOV_EXCL_LINE
67 return DLOG_ERROR_NOT_PERMITTED; // LCOV_EXCL_LINE
71 * @brief Limiter rule from config
72 * @details Adds a limiter rule from a config entry, if one exists inside
73 * @param[in] key The entry key
74 * @param[in] value The entry value
75 * @param[in,out] u Userdata (unused)
78 static void __config_iteration(const char* key, const char* value, void *u)
83 static const int prefix_len = sizeof("limiter|") - 1;
85 char limiter_tag[MAX_CONF_KEY_LEN];
88 if (strncmp(key, "limiter|", prefix_len))
91 delimiter_pos = strchr(key + prefix_len + 1, '|');
92 if (!delimiter_pos || (delimiter_pos + 1 == key + strlen(key)))
95 snprintf(limiter_tag, delimiter_pos - (key + prefix_len) + 1, "%s", key + prefix_len);
97 if (!strcmp(value, "allow"))
98 limit = __LOG_LIMITER_LIMIT_MAX + 1;
99 else if (!strcmp(value, "deny"))
104 __log_limiter_add_rule(limiter_tag, *(delimiter_pos + 1), limit);
108 static int __configure_limiter(struct log_config *config)
112 int enabled = log_config_get_int(config, "limiter", DEFAULT_CONFIG_LIMITER);
116 log_config_foreach(config, __config_iteration, NULL); // LCOV_EXCL_LINE
118 return (__log_limiter_initialize() == 0); // LCOV_EXCL_LINE
121 static int __configure_backend(struct log_config *config)
125 const char *const backend = log_config_get(config, "backend");
129 if (!strcmp(backend, "pipe"))
131 else if (!strcmp(backend, "logger"))
132 __dlog_init_android();
139 static void __configure_parameters(struct log_config *config)
143 plog = log_config_get_int(config, "plog", DEFAULT_CONFIG_PLOG);
144 debugmode = log_config_get_int(config, "debugmode", DEFAULT_CONFIG_DEBUGMODE);
145 fatal_assert = access(DEBUGMODE_FILE, F_OK) != -1;
146 limiter = __configure_limiter(config);
150 * @brief Configure the library
151 * @details Reads relevant config values
153 static void __configure(void)
155 struct log_config config;
157 if (log_config_read(&config) < 0)
160 __configure_parameters(&config);
162 if (!__configure_backend(&config))
165 log_config_free(&config);
169 log_config_free(&config); // LCOV_EXCL_LINE
175 * @details Initializes the library
177 static inline void __dlog_init(void)
179 static int is_initialized = 0;
184 pthread_mutex_lock(&log_init_lock);
186 if (!is_initialized) {
191 pthread_mutex_unlock(&log_init_lock);
195 * @brief Fatal assertion
196 * @details Conditionally crash the sucka who sent the log
197 * @param[in] prio Priority of the log
199 static void __dlog_fatal_assert(int prio)
201 assert(!fatal_assert || (prio != DLOG_FATAL));
205 * @brief Check log validity
206 * @details Checks whether the log is valid and eligible for printing
207 * @param[in] log_id The target buffer ID
208 * @param[in] prio The log's priority
209 * @param[in] tag The log's tag
210 * @return 0 on success, else an error code.
211 * @retval DLOG_ERROR_INVALID_PARAMETER Invalid parameter
212 * @retval DLOG_ERROR_NOT_PERMITTED Not permitted
214 static int dlog_should_log(log_id_t log_id, int prio, const char *tag)
216 if (!debugmode && prio <= DLOG_DEBUG)
217 return DLOG_ERROR_INVALID_PARAMETER;
220 return DLOG_ERROR_INVALID_PARAMETER;
222 if (log_id == LOG_ID_INVALID || LOG_ID_MAX <= log_id)
223 return DLOG_ERROR_INVALID_PARAMETER;
225 if (log_id != LOG_ID_APPS && !plog)
226 return DLOG_ERROR_NOT_PERMITTED;
229 // LCOV_EXCL_START : disabled feature (limiter)
230 int should_log = __log_limiter_pass_log(tag, prio);
233 return DLOG_ERROR_NOT_PERMITTED;
234 } else if (should_log < 0) {
235 write_to_log(log_id, prio, tag,
236 "Your log has been blocked due to limit of log lines per minute.");
237 return DLOG_ERROR_NOT_PERMITTED;
242 return DLOG_ERROR_NONE;
245 static int __write_to_log(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap, bool check_should_log)
247 char buf[LOG_MAX_PAYLOAD_SIZE];
251 int ret = check_should_log ? dlog_should_log(log_id, prio, tag) : 0;
255 vsnprintf(buf, sizeof buf, fmt, ap);
257 return write_to_log(log_id, prio, tag, buf);
262 * @details Print a log line
263 * @param[in] log_id The target buffer ID
264 * @param[in] prio Priority
266 * @param[in] fmt Format (same as printf)
267 * @param[in] ap Argument list
268 * @return Bytes written, or negative error
270 int __dlog_vprint(log_id_t log_id, int prio, const char *tag, const char *fmt, va_list ap)
272 int ret = __write_to_log(log_id, prio, tag, fmt, ap, true);
273 __dlog_fatal_assert(prio);
280 * @details Print a log line
281 * @param[in] log_id The target buffer ID
282 * @param[in] prio Priority
284 * @param[in] fmt Format (same as printf)
285 * @return Bytes written, or negative error
287 int __dlog_print(log_id_t log_id, int prio, const char *tag, const char *fmt, ...)
292 int ret = __dlog_vprint(log_id, prio, tag, fmt, ap);
298 int dlog_vprint(log_priority prio, const char *tag, const char *fmt, va_list ap)
300 return __write_to_log(LOG_ID_APPS, prio, tag, fmt, ap, false);
303 int dlog_print(log_priority prio, const char *tag, const char *fmt, ...)
308 int ret = dlog_vprint(prio, tag, fmt, ap);
315 * @brief Finalize DLog
316 * @details Finalizes and deallocates the library
318 void __attribute__((destructor)) __dlog_fini(void)
320 __log_limiter_destroy();