1 /* Copyright 1999-2004 The Apache Software Foundation
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef APACHE_HTTP_LOG_H
17 #define APACHE_HTTP_LOG_H
23 #include "apr_thread_proc.h"
26 * @package Apache logging library
36 #define APLOG_EMERG LOG_EMERG /* system is unusable */
37 #define APLOG_ALERT LOG_ALERT /* action must be taken immediately */
38 #define APLOG_CRIT LOG_CRIT /* critical conditions */
39 #define APLOG_ERR LOG_ERR /* error conditions */
40 #define APLOG_WARNING LOG_WARNING /* warning conditions */
41 #define APLOG_NOTICE LOG_NOTICE /* normal but significant condition */
42 #define APLOG_INFO LOG_INFO /* informational */
43 #define APLOG_DEBUG LOG_DEBUG /* debug-level messages */
45 #define APLOG_LEVELMASK LOG_PRIMASK /* mask off the level value */
49 #define APLOG_EMERG 0 /* system is unusable */
50 #define APLOG_ALERT 1 /* action must be taken immediately */
51 #define APLOG_CRIT 2 /* critical conditions */
52 #define APLOG_ERR 3 /* error conditions */
53 #define APLOG_WARNING 4 /* warning conditions */
54 #define APLOG_NOTICE 5 /* normal but significant condition */
55 #define APLOG_INFO 6 /* informational */
56 #define APLOG_DEBUG 7 /* debug-level messages */
58 #define APLOG_LEVELMASK 7 /* mask off the level value */
62 /* APLOG_NOERRNO is ignored and should not be used. It will be
63 * removed in a future release of Apache.
65 #define APLOG_NOERRNO (APLOG_LEVELMASK + 1)
67 /* Use APLOG_TOCLIENT on ap_log_rerror() to give content
68 * handlers the option of including the error text in the
69 * ErrorDocument sent back to the client. Setting APLOG_TOCLIENT
70 * will cause the error text to be saved in the request_rec->notes
71 * table, keyed to the string "error-notes", if and only if:
72 * - the severity level of the message is APLOG_WARNING or greater
73 * - there are no other "error-notes" set in request_rec->notes
74 * Once error-notes is set, it is up to the content handler to
75 * determine whether this text should be sent back to the client.
76 * Note: Client generated text streams sent back to the client MUST
77 * be escaped to prevent CSS attacks.
79 #define APLOG_TOCLIENT ((APLOG_LEVELMASK + 1) * 2)
81 /* normal but significant condition on startup, usually printed to stderr */
82 #define APLOG_STARTUP ((APLOG_LEVELMASK + 1) * 4)
84 #ifndef DEFAULT_LOGLEVEL
85 #define DEFAULT_LOGLEVEL APLOG_WARNING
88 extern int AP_DECLARE_DATA ap_default_loglevel;
90 #define APLOG_MARK __FILE__,__LINE__
93 * Set up for logging to stderr.
94 * @param p The pool to allocate out of
96 AP_DECLARE(void) ap_open_stderr_log(apr_pool_t *p);
99 * Replace logging to stderr with logging to the given file.
100 * @param p The pool to allocate out of
101 * @param file Name of the file to log stderr output
103 AP_DECLARE(apr_status_t) ap_replace_stderr_log(apr_pool_t *p,
107 * Open the error log and replace stderr with it.
108 * @param pconf Not used
109 * @param plog The pool to allocate the logs from
110 * @param ptemp Pool used for temporary allocations
111 * @param s_main The main server
112 * @tip ap_open_logs isn't expected to be used by modules, it is
113 * an internal core function
115 int ap_open_logs(apr_pool_t *pconf, apr_pool_t *plog,
116 apr_pool_t *ptemp, server_rec *s_main);
119 * The three primary logging functions, ap_log_error, ap_log_rerror, and
120 * ap_log_perror use a printf style format string to build the log message.
121 * It is VERY IMPORTANT that you not include any raw data from the network,
122 * such as the request-URI or request header fields, within the format
123 * string. Doing so makes the server vulnerable to a denial-of-service
124 * attack and other messy behavior. Instead, use a simple format string
125 * like "%s", followed by the string containing the untrusted data.
129 * One of the primary logging routines in Apache. This uses a printf-like
130 * format to log messages to the error_log.
131 * @param file The file in which this function is called
132 * @param line The line number on which this function is called
133 * @param level The level of this error message
134 * @param status The status code from the previous command
135 * @param s The server on which we are logging
136 * @param fmt The format string
137 * @param ... The arguments to use to fill out fmt.
138 * @tip Use APLOG_MARK to fill out file and line
139 * @warning It is VERY IMPORTANT that you not include any raw data from
140 * the network, such as the request-URI or request header fields, within
141 * the format string. Doing so makes the server vulnerable to a
142 * denial-of-service attack and other messy behavior. Instead, use a
143 * simple format string like "%s", followed by the string containing the
145 * @deffunc void ap_log_error(const char *file, int line, int level, apr_status_t status, const server_rec *s, const char *fmt, ...)
147 AP_DECLARE(void) ap_log_error(const char *file, int line, int level,
148 apr_status_t status, const server_rec *s,
149 const char *fmt, ...)
150 __attribute__((format(printf,6,7)));
153 * The second of the primary logging routines in Apache. This uses
154 * a printf-like format to log messages to the error_log.
155 * @param file The file in which this function is called
156 * @param line The line number on which this function is called
157 * @param level The level of this error message
158 * @param status The status code from the previous command
159 * @param p The pool which we are logging for
160 * @param fmt The format string
161 * @param ... The arguments to use to fill out fmt.
162 * @tip Use APLOG_MARK to fill out file and line
163 * @warning It is VERY IMPORTANT that you not include any raw data from
164 * the network, such as the request-URI or request header fields, within
165 * the format string. Doing so makes the server vulnerable to a
166 * denial-of-service attack and other messy behavior. Instead, use a
167 * simple format string like "%s", followed by the string containing the
169 * @deffunc void ap_log_perror(const char *file, int line, int level, apr_status_t status, apr_pool_t *p, const char *fmt, ...)
171 AP_DECLARE(void) ap_log_perror(const char *file, int line, int level,
172 apr_status_t status, apr_pool_t *p,
173 const char *fmt, ...)
174 __attribute__((format(printf,6,7)));
177 * The last of the primary logging routines in Apache. This uses
178 * a printf-like format to log messages to the error_log.
179 * @param file The file in which this function is called
180 * @param line The line number on which this function is called
181 * @param level The level of this error message
182 * @param status The status code from the previous command
183 * @param s The request which we are logging for
184 * @param fmt The format string
185 * @param ... The arguments to use to fill out fmt.
186 * @tip Use APLOG_MARK to fill out file and line
187 * @warning It is VERY IMPORTANT that you not include any raw data from
188 * the network, such as the request-URI or request header fields, within
189 * the format string. Doing so makes the server vulnerable to a
190 * denial-of-service attack and other messy behavior. Instead, use a
191 * simple format string like "%s", followed by the string containing the
193 * @deffunc void ap_log_rerror(const char *file, int line, int level, apr_status_t status, request_rec *r, const char *fmt, ...)
195 AP_DECLARE(void) ap_log_rerror(const char *file, int line, int level,
196 apr_status_t status, const request_rec *r,
197 const char *fmt, ...)
198 __attribute__((format(printf,6,7)));
201 * Convert stderr to the error log
202 * @param s The current server
203 * @deffunc void ap_error_log2stderr(server_rec *s)
205 AP_DECLARE(void) ap_error_log2stderr(server_rec *s);
208 * Log the current pid of the parent process
209 * @param p The pool to use for logging
210 * @param fname The name of the file to log to
212 AP_DECLARE(void) ap_log_pid(apr_pool_t *p, const char *fname);
215 * Retrieve the pid from a pidfile.
216 * @param p The pool to use for logging
217 * @param filename The name of the file containing the pid
218 * @param mypid Pointer to pid_t (valid only if return APR_SUCCESS)
220 AP_DECLARE(apr_status_t) ap_read_pid(apr_pool_t *p, const char *filename, pid_t *mypid);
222 typedef struct piped_log piped_log;
225 * The piped logging structure. Piped logs are used to move functionality
226 * out of the main server. For example, log rotation is done with piped logs.
229 /** The pool to use for the piped log */
231 /** The pipe between the server and the logging process */
233 /* XXX - an #ifdef that needs to be eliminated from public view. Shouldn't
235 #ifdef AP_HAVE_RELIABLE_PIPED_LOGS
236 /** The name of the program the logging process is running */
238 /** The pid of the logging process */
244 * Open the piped log process
245 * @param p The pool to allocate out of
246 * @param program The program to run in the logging process
247 * @return The piped log structure
248 * @deffunc piped_log *ap_open_piped_log(apr_pool_t *p, const char *program)
250 AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program);
253 * Close the piped log and kill the logging process
254 * @param pl The piped log structure
255 * @deffunc void ap_close_piped_log(piped_log *pl)
257 AP_DECLARE(void) ap_close_piped_log(piped_log *pl);
260 * A macro to access the read side of the piped log pipe
261 * @param pl The piped log structure
262 * @return The native file descriptor
263 * @deffunc ap_piped_log_read_fd(pl)
265 #define ap_piped_log_read_fd(pl) ((pl)->fds[0])
268 * A macro to access the write side of the piped log pipe
269 * @param pl The piped log structure
270 * @return The native file descriptor
271 * @deffunc ap_piped_log_read_fd(pl)
273 #define ap_piped_log_write_fd(pl) ((pl)->fds[1])
275 AP_DECLARE_HOOK(void, error_log, (const char *file, int line, int level,
276 apr_status_t status, const server_rec *s,
277 const request_rec *r, apr_pool_t *pool,
284 #endif /* !APACHE_HTTP_LOG_H */