http_log.h revision 7c253d100ca111a50451b942d839b7be39578027
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file http_log.h
* @brief Apache Logging library
*
* @defgroup APACHE_CORE_LOG Logging library
* @ingroup APACHE_CORE
* @{
*/
#ifndef APACHE_HTTP_LOG_H
#define APACHE_HTTP_LOG_H
#ifdef __cplusplus
extern "C" {
#endif
#include "apr_thread_proc.h"
#ifdef HAVE_SYSLOG
#include <syslog.h>
#include "http_config.h"
#ifndef LOG_PRIMASK
#define LOG_PRIMASK 7
#endif
#define APLOG_EMERG LOG_EMERG /* system is unusable */
#define APLOG_ALERT LOG_ALERT /* action must be taken immediately */
#define APLOG_CRIT LOG_CRIT /* critical conditions */
#define APLOG_ERR LOG_ERR /* error conditions */
#define APLOG_WARNING LOG_WARNING /* warning conditions */
#define APLOG_NOTICE LOG_NOTICE /* normal but significant condition */
#define APLOG_INFO LOG_INFO /* informational */
#define APLOG_DEBUG LOG_DEBUG /* debug-level messages */
#define APLOG_TRACE1 (LOG_DEBUG + 1) /* trace-level 1 messages */
#define APLOG_TRACE2 (LOG_DEBUG + 2) /* trace-level 2 messages */
#define APLOG_TRACE3 (LOG_DEBUG + 3) /* trace-level 3 messages */
#define APLOG_TRACE4 (LOG_DEBUG + 4) /* trace-level 4 messages */
#define APLOG_TRACE5 (LOG_DEBUG + 5) /* trace-level 5 messages */
#define APLOG_TRACE6 (LOG_DEBUG + 6) /* trace-level 6 messages */
#define APLOG_TRACE7 (LOG_DEBUG + 7) /* trace-level 7 messages */
#define APLOG_TRACE8 (LOG_DEBUG + 8) /* trace-level 8 messages */
#define APLOG_LEVELMASK 15 /* mask off the level value */
#else
#define APLOG_EMERG 0 /* system is unusable */
#define APLOG_ALERT 1 /* action must be taken immediately */
#define APLOG_CRIT 2 /* critical conditions */
#define APLOG_ERR 3 /* error conditions */
#define APLOG_WARNING 4 /* warning conditions */
#define APLOG_NOTICE 5 /* normal but significant condition */
#define APLOG_INFO 6 /* informational */
#define APLOG_DEBUG 7 /* debug-level messages */
#define APLOG_TRACE1 8 /* trace-level 1 messages */
#define APLOG_TRACE2 9 /* trace-level 2 messages */
#define APLOG_TRACE3 10 /* trace-level 3 messages */
#define APLOG_TRACE4 11 /* trace-level 4 messages */
#define APLOG_TRACE5 12 /* trace-level 5 messages */
#define APLOG_TRACE6 13 /* trace-level 6 messages */
#define APLOG_TRACE7 14 /* trace-level 7 messages */
#define APLOG_TRACE8 15 /* trace-level 8 messages */
#define APLOG_LEVELMASK 15 /* mask off the level value */
#endif
/* APLOG_NOERRNO is ignored and should not be used. It will be
* removed in a future release of Apache.
*/
#define APLOG_NOERRNO (APLOG_LEVELMASK + 1)
/* Use APLOG_TOCLIENT on ap_log_rerror() to give content
* handlers the option of including the error text in the
* ErrorDocument sent back to the client. Setting APLOG_TOCLIENT
* will cause the error text to be saved in the request_rec->notes
* table, keyed to the string "error-notes", if and only if:
* - the severity level of the message is APLOG_WARNING or greater
* - there are no other "error-notes" set in request_rec->notes
* Once error-notes is set, it is up to the content handler to
* determine whether this text should be sent back to the client.
* Note: Client generated text streams sent back to the client MUST
* be escaped to prevent CSS attacks.
*/
#define APLOG_TOCLIENT ((APLOG_LEVELMASK + 1) * 2)
/* normal but significant condition on startup, usually printed to stderr */
#define APLOG_STARTUP ((APLOG_LEVELMASK + 1) * 4)
#ifndef DEFAULT_LOGLEVEL
#define DEFAULT_LOGLEVEL APLOG_WARNING
#endif
#define APLOG_NO_MODULE -1
/*
* Objects with static storage duration are set to NULL if not
* initialized explicitly. This means if aplog_module_index
* is not initalized using the APLOG_USE_MODULE or the
* AP_DECLARE_MODULE macro, we can safely fall back to
* use APLOG_NO_MODULE.
*/
static int * const aplog_module_index;
#define APLOG_MODULE_INDEX \
(aplog_module_index ? *aplog_module_index : APLOG_NO_MODULE)
/*
* APLOG_MAX_LOGLEVEL can be used to remove logging above some
* specified level at compile time.
*/
#ifndef APLOG_MAX_LOGLEVEL
#define APLOG_MODULE_IS_LEVEL(s,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(s == NULL) || \
(ap_get_server_module_loglevel(s, module_index) \
>= ((level)&APLOG_LEVELMASK) ) )
#define APLOG_C_MODULE_IS_LEVEL(c,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(ap_get_conn_module_loglevel(c, module_index) \
>= ((level)&APLOG_LEVELMASK) ) )
#define APLOG_R_MODULE_IS_LEVEL(r,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(ap_get_request_module_loglevel(r, module_index) \
>= ((level)&APLOG_LEVELMASK) ) )
#else
#define APLOG_MODULE_IS_LEVEL(s,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_MAX_LOGLEVEL) && \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(s == NULL) || \
(ap_get_server_module_loglevel(s, module_index) \
>= ((level)&APLOG_LEVELMASK) ) ) )
#define APLOG_C_MODULE_IS_LEVEL(c,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_MAX_LOGLEVEL) && \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(ap_get_conn_module_loglevel(c, module_index) \
>= ((level)&APLOG_LEVELMASK) ) ) )
#define APLOG_R_MODULE_IS_LEVEL(r,module_index,level) \
( (((level)&APLOG_LEVELMASK) <= APLOG_MAX_LOGLEVEL) && \
( (((level)&APLOG_LEVELMASK) <= APLOG_NOTICE) || \
(ap_get_request_module_loglevel(r, module_index) \
>= ((level)&APLOG_LEVELMASK) ) ) )
#endif
#define APLOG_IS_LEVEL(s,level) \
APLOG_MODULE_IS_LEVEL(s,APLOG_MODULE_INDEX,level)
#define APLOG_C_IS_LEVEL(c,level) \
APLOG_C_MODULE_IS_LEVEL(c,APLOG_MODULE_INDEX,level)
#define APLOG_R_IS_LEVEL(r,level) \
APLOG_R_MODULE_IS_LEVEL(r,APLOG_MODULE_INDEX,level)
#define APLOGinfo(s) APLOG_IS_LEVEL(s,APLOG_INFO)
#define APLOGdebug(s) APLOG_IS_LEVEL(s,APLOG_DEBUG)
#define APLOGtrace1(s) APLOG_IS_LEVEL(s,APLOG_TRACE1)
#define APLOGtrace2(s) APLOG_IS_LEVEL(s,APLOG_TRACE2)
#define APLOGtrace3(s) APLOG_IS_LEVEL(s,APLOG_TRACE3)
#define APLOGtrace4(s) APLOG_IS_LEVEL(s,APLOG_TRACE4)
#define APLOGtrace5(s) APLOG_IS_LEVEL(s,APLOG_TRACE5)
#define APLOGtrace6(s) APLOG_IS_LEVEL(s,APLOG_TRACE6)
#define APLOGtrace7(s) APLOG_IS_LEVEL(s,APLOG_TRACE7)
#define APLOGtrace8(s) APLOG_IS_LEVEL(s,APLOG_TRACE8)
#define APLOGrinfo(r) APLOG_R_IS_LEVEL(r,APLOG_INFO)
#define APLOGrdebug(r) APLOG_R_IS_LEVEL(r,APLOG_DEBUG)
#define APLOGrtrace1(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE1)
#define APLOGrtrace2(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE2)
#define APLOGrtrace3(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE3)
#define APLOGrtrace4(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE4)
#define APLOGrtrace5(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE5)
#define APLOGrtrace6(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE6)
#define APLOGrtrace7(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE7)
#define APLOGrtrace8(r) APLOG_R_IS_LEVEL(r,APLOG_TRACE8)
#define APLOGcinfo(c) APLOG_C_IS_LEVEL(c,APLOG_INFO)
#define APLOGcdebug(c) APLOG_C_IS_LEVEL(c,APLOG_DEBUG)
#define APLOGctrace1(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE1)
#define APLOGctrace2(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE2)
#define APLOGctrace3(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE3)
#define APLOGctrace4(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE4)
#define APLOGctrace5(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE5)
#define APLOGctrace6(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE6)
#define APLOGctrace7(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE7)
#define APLOGctrace8(c) APLOG_C_IS_LEVEL(c,APLOG_TRACE8)
extern int AP_DECLARE_DATA ap_default_loglevel;
#define APLOG_MARK __FILE__,__LINE__,APLOG_MODULE_INDEX
/**
* Set up for logging to stderr.
* @param p The pool to allocate out of
*/
AP_DECLARE(void) ap_open_stderr_log(apr_pool_t *p);
/**
* Replace logging to stderr with logging to the given file.
* @param p The pool to allocate out of
* @param file Name of the file to log stderr output
*/
AP_DECLARE(apr_status_t) ap_replace_stderr_log(apr_pool_t *p,
const char *file);
/**
* Open the error log and replace stderr with it.
* @param pconf Not used
* @param plog The pool to allocate the logs from
* @param ptemp Pool used for temporary allocations
* @param s_main The main server
* @note ap_open_logs isn't expected to be used by modules, it is
* an internal core function
*/
int ap_open_logs(apr_pool_t *pconf, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s_main);
/**
* Perform special processing for piped loggers in MPM child
* processes.
* @param p Not used
* @param s Not used
* @note ap_logs_child_init is not for use by modules; it is an
* internal core function
*/
void ap_logs_child_init(apr_pool_t *p, server_rec *s);
/*
* The primary logging functions, ap_log_error, ap_log_rerror, ap_log_cerror,
* and ap_log_perror use a printf style format string to build the log message.
* It is VERY IMPORTANT that you not include any raw data from the network,
* such as the request-URI or request header fields, within the format
* string. Doing so makes the server vulnerable to a denial-of-service
* attack and other messy behavior. Instead, use a simple format string
* like "%s", followed by the string containing the untrusted data.
*/
/**
* ap_log_error() - log messages which are not related to a particular
* request or connection. This uses a printf-like format to log messages
* to the error_log.
* @param file The file in which this function is called
* @param line The line number on which this function is called
* @param module_index The module_index of the module generating this message
* @param level The level of this error message
* @param status The status code from the previous command
* @param s The server on which we are logging
* @param fmt The format string
* @param ... The arguments to use to fill out fmt.
* @note Use APLOG_MARK to fill out file and line
* @note If a request_rec is available, use that with ap_log_rerror()
* in preference to calling this function. Otherwise, if a conn_rec is
* available, use that with ap_log_cerror() in preference to calling
* this function.
* @warning It is VERY IMPORTANT that you not include any raw data from
* the network, such as the request-URI or request header fields, within
* the format string. Doing so makes the server vulnerable to a
* denial-of-service attack and other messy behavior. Instead, use a
* simple format string like "%s", followed by the string containing the
* untrusted data.
*/
#if __STDC_VERSION__ >= 199901L
/* need additional step to expand APLOG_MARK first */
#define ap_log_error(...) ap_log_error__(__VA_ARGS__)
#define ap_log_error__(file, line, mi, level, status, s, ...) \
do { if (APLOG_MODULE_IS_LEVEL(s, mi, level)) \
ap_log_error_(file, line, mi, level, status, s, __VA_ARGS__); \
} while(0)
#else
#define ap_log_error ap_log_error_
#endif
AP_DECLARE(void) ap_log_error_(const char *file, int line, int module_index,
int level, apr_status_t status,
const server_rec *s, const char *fmt, ...)
__attribute__((format(printf,7,8)));
/**
* ap_log_perror() - log messages which are not related to a particular
* request, connection, or virtual server. This uses a printf-like
* format to log messages to the error_log.
* @param file The file in which this function is called
* @param line The line number on which this function is called
* @param module_index ignored dummy value for use by APLOG_MARK
* @param level The level of this error message
* @param status The status code from the previous command
* @param p The pool which we are logging for
* @param fmt The format string
* @param ... The arguments to use to fill out fmt.
* @note Use APLOG_MARK to fill out file and line
* @warning It is VERY IMPORTANT that you not include any raw data from
* the network, such as the request-URI or request header fields, within
* the format string. Doing so makes the server vulnerable to a
* denial-of-service attack and other messy behavior. Instead, use a
* simple format string like "%s", followed by the string containing the
* untrusted data.
*/
#if __STDC_VERSION__ >= 199901L && defined(APLOG_MAX_LOGLEVEL)
/* need additional step to expand APLOG_MARK first */
#define ap_log_perror(...) ap_log_perror__(__VA_ARGS__)
#define ap_log_perror__(file, line, mi, level, status, p, ...) \
do { if ((level) <= APLOG_MAX_LOGLEVEL ) \
ap_do_log_perror(file, line, mi, level, status, p, \
__VA_ARGS__); } while(0)
#else
#define ap_log_perror ap_log_perror_
#endif
AP_DECLARE(void) ap_log_perror_(const char *file, int line, int module_index,
int level, apr_status_t status, apr_pool_t *p,
const char *fmt, ...)
__attribute__((format(printf,7,8)));
/**
* ap_log_rerror() - log messages which are related to a particular
* request. This uses a a printf-like format to log messages to the
* error_log.
* @param file The file in which this function is called
* @param line The line number on which this function is called
* @param module_index The module_index of the module generating this message
* @param level The level of this error message
* @param status The status code from the previous command
* @param r The request which we are logging for
* @param fmt The format string
* @param ... The arguments to use to fill out fmt.
* @note Use APLOG_MARK to fill out file and line
* @warning It is VERY IMPORTANT that you not include any raw data from
* the network, such as the request-URI or request header fields, within
* the format string. Doing so makes the server vulnerable to a
* denial-of-service attack and other messy behavior. Instead, use a
* simple format string like "%s", followed by the string containing the
* untrusted data.
*/
#if __STDC_VERSION__ >= 199901L
/* need additional step to expand APLOG_MARK first */
#define ap_log_rerror(...) ap_log_rerror__(__VA_ARGS__)
#define ap_log_rerror__(file, line, mi, level, status, r, ...) \
do { if (APLOG_MODULE_IS_LEVEL(r->server, mi, level)) \
ap_log_rerror_(file, line, mi, level, status, r, __VA_ARGS__); \
} while(0)
#else
#define ap_log_rerror ap_log_rerror_
#endif
AP_DECLARE(void) ap_log_rerror_(const char *file, int line, int module_index,
int level, apr_status_t status,
const request_rec *r, const char *fmt, ...)
__attribute__((format(printf,7,8)));
/**
* ap_log_cerror() - log messages which are related to a particular
* connection. This uses a a printf-like format to log messages to the
* error_log.
* @param file The file in which this function is called
* @param line The line number on which this function is called
* @param level The level of this error message
* @param module_index The module_index of the module generating this message
* @param status The status code from the previous command
* @param c The connection which we are logging for
* @param fmt The format string
* @param ... The arguments to use to fill out fmt.
* @note Use APLOG_MARK to fill out file and line
* @note If a request_rec is available, use that with ap_log_rerror()
* in preference to calling this function.
* @warning It is VERY IMPORTANT that you not include any raw data from
* the network, such as the request-URI or request header fields, within
* the format string. Doing so makes the server vulnerable to a
* denial-of-service attack and other messy behavior. Instead, use a
* simple format string like "%s", followed by the string containing the
* untrusted data.
*/
#if __STDC_VERSION__ >= 199901L
/* need additional step to expand APLOG_MARK first */
#define ap_log_cerror(...) ap_log_cerror__(__VA_ARGS__)
#define ap_log_cerror__(file, line, mi, level, status, c, ...) \
do { if (APLOG_MODULE_IS_LEVEL(c->base_server, mi, level)) \
ap_log_cerror_(file, line, mi, level, status, c, __VA_ARGS__); \
} while(0)
#else
#define ap_log_cerror ap_log_cerror_
#endif
AP_DECLARE(void) ap_log_cerror_(const char *file, int line, int module_level,
int level, apr_status_t status,
const conn_rec *c, const char *fmt, ...)
__attribute__((format(printf,7,8)));
/**
* Convert stderr to the error log
* @param s The current server
*/
AP_DECLARE(void) ap_error_log2stderr(server_rec *s);
/**
* Log the command line used to start the server.
* @param p The pool to use for logging
* @param s The server_rec whose process's command line we want to log.
* The command line is logged to that server's error log.
*/
AP_DECLARE(void) ap_log_command_line(apr_pool_t *p, server_rec *s);
/**
* Log the current pid of the parent process
* @param p The pool to use for logging
* @param fname The name of the file to log to
*/
AP_DECLARE(void) ap_log_pid(apr_pool_t *p, const char *fname);
/**
* Retrieve the pid from a pidfile.
* @param p The pool to use for logging
* @param filename The name of the file containing the pid
* @param mypid Pointer to pid_t (valid only if return APR_SUCCESS)
*/
AP_DECLARE(apr_status_t) ap_read_pid(apr_pool_t *p, const char *filename, pid_t *mypid);
/** @see piped_log */
typedef struct piped_log piped_log;
/**
* Open the piped log process
* @param p The pool to allocate out of
* @param program The program to run in the logging process
* @return The piped log structure
* @note The log program is invoked as @p APR_PROGRAM_ENV,
* @see ap_open_piped_log_ex to modify this behavior
*/
AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program);
/**
* Open the piped log process specifying the execution choice for program
* @param p The pool to allocate out of
* @param program The program to run in the logging process
* @param cmdtype How to invoke program, e.g. APR_PROGRAM, APR_SHELLCMD_ENV, etc
* @return The piped log structure
*/
AP_DECLARE(piped_log *) ap_open_piped_log_ex(apr_pool_t *p,
const char *program,
apr_cmdtype_e cmdtype);
/**
* Close the piped log and kill the logging process
* @param pl The piped log structure
*/
AP_DECLARE(void) ap_close_piped_log(piped_log *pl);
/**
* A function to return the read side of the piped log pipe
* @param pl The piped log structure
* @return The native file descriptor
*/
AP_DECLARE(apr_file_t *) ap_piped_log_read_fd(piped_log *pl);
/**
* A function to return the write side of the piped log pipe
* @param pl The piped log structure
* @return The native file descriptor
*/
AP_DECLARE(apr_file_t *) ap_piped_log_write_fd(piped_log *pl);
/**
* hook method to log error messages
* @ingroup hooks
* @param file The file in which this function is called
* @param line The line number on which this function is called
* @param module_index The module_index of the module generating this message
* @param level The level of this error message
* @param status The status code from the previous command
* @param s The server which we are logging for
* @param r The request which we are logging for
* @param pool Memory pool to allocate from
* @param errstr message to log
*/
AP_DECLARE_HOOK(void, error_log, (const char *file, int line,
int module_index, int level,
apr_status_t status, const server_rec *s,
const request_rec *r, apr_pool_t *pool,
const char *errstr))
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_HTTP_LOG_H */
/** @} */