log.c File Reference

Support functions for logging in FreeRADIUS libraries. More...

#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/log.h>
#include <freeradius-devel/util/print.h>
#include <freeradius-devel/util/syserror.h>
#include <freeradius-devel/util/value.h>
#include <fcntl.h>

Include dependency graph for log.c:

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Functions
static int	_fr_log_pool_free (void *arg)
	Cleanup the memory pool used by vlog_request.
static int	_restore_std_legacy (UNUSED int sig)
	On fault, reset STDOUT and STDERR to something useful.
static ssize_t	_syslog_write (UNUSED void *cookie, const char *buf, size_t size)
	Write complete lines to syslog.
void	fr_canonicalize_error (TALLOC_CTX *ctx, char **sp, char **text, ssize_t slen, char const *fmt)
	Canonicalize error strings, removing tabs, and generate spaces for error marker.
void	fr_log (fr_log_t const *log, fr_log_type_t type, char const *file, int line, char const *fmt,...)
	Send a server log message to its destination.
int	fr_log_close (fr_log_t *log)
	Universal close function for all logging destinations.
void	fr_log_fd_event (UNUSED fr_event_list_t *el, int fd, UNUSED int flags, void *uctx)
	Function to provide as the readable callback to the event loop.
void	fr_log_global_free (void)
	Restores the original stdout and stderr FDs, closes the pipes and removes them from the event loop.
int	fr_log_global_init (fr_event_list_t *el, bool daemonize)
	Manipulate stderr and stdout so that was capture all data send to it from libraries.
void	fr_log_hex (fr_log_t const *log, fr_log_type_t type, char const *file, int line, uint8_t const *data, size_t data_len, char const *line_prefix_fmt,...)
	Print out hex block.
void	fr_log_hex_marker (fr_log_t const *log, fr_log_type_t type, char const *file, int line, uint8_t const *data, size_t data_len, ssize_t marker_idx, char const *marker, char const *line_prefix_fmt,...)
	Print out hex block.
int	fr_log_init_file (fr_log_t *log, char const *file)
	Initialise a file logging destination.
int	fr_log_init_fp (fr_log_t *log, FILE *fp)
	Initialise a file logging destination to a FILE*.
int	fr_log_init_func (fr_log_t *log, cookie_write_function_t write, cookie_close_function_t close, void *uctx)
	Initialise a function based logging destination.
int	fr_log_init_legacy (fr_log_t *log, bool daemonize)
	Initialise file descriptors based on logging destination.
int	fr_log_init_std (fr_log_t *log, fr_log_dst_t dst_type)
	Initialise log dst for stdout, stderr or /dev/null.
int	fr_log_init_syslog (fr_log_t *log)
	Initialise a syslog logging destination.
void	fr_log_marker (fr_log_t const *log, fr_log_type_t type, char const *file, int line, char const *str, size_t str_len, ssize_t marker_idx, char const *marker, char const *line_prefix_fmt,...)
	Print out an error marker.
void	fr_log_perror (fr_log_t const *log, fr_log_type_t type, char const *file, int line, fr_log_perror_format_t const *rules, char const *fmt,...)
	Drain any outstanding messages from the fr_strerror buffers.
TALLOC_CTX *	fr_log_pool_init (void)
	talloc ctx to use when composing log messages
void	fr_vlog (fr_log_t const *log, fr_log_type_t type, char const *file, int line, char const *fmt, va_list ap)
	Send a server log message to its destination.
void	fr_vlog_perror (fr_log_t const *log, fr_log_type_t type, char const *file, int line, fr_log_perror_format_t const *f_rules, char const *fmt, va_list ap)
	Drain any outstanding messages from the fr_strerror buffers.

Variables
static fr_table_num_ordered_t const	colours []
	Maps log categories to VT100 style/colour escape sequences.
static size_t	colours_len = NUM_ELEMENTS(colours)
fr_log_t	default_log
static FILE *	devnull
	File handle for /dev/null.
int	fr_debug_lvl = 0
FILE *	fr_log_fp = NULL
fr_table_num_ordered_t const	fr_log_levels []
	Maps log categories to message prefixes.
size_t	fr_log_levels_len = NUM_ELEMENTS(fr_log_levels)
static _Thread_local TALLOC_CTX *	fr_log_pool
bool	fr_log_rate_limit = true
	Whether repeated log entries should be rate limited.
static uint32_t	location_indent = 30
bool	log_dates_utc = false
static fr_event_list_t *	log_el
	Event loop we use for process logging data.
static _Thread_local fr_log_type_t	log_msg_type
	The type of the last message logged.
static fr_log_fd_event_ctx_t	stderr_ctx
	Logging ctx for stderr.
static int	stderr_fd = -1
	The original unmolested stderr file descriptor.
static int	stderr_pipe [2]
	Pipe we use to transport stderr data.
static fr_log_fd_event_ctx_t	stdout_ctx
	Logging ctx for stdout.
static int	stdout_fd = -1
	The original unmolested stdout file descriptor.
static int	stdout_pipe [2]
	Pipe we use to transport stdout data.

VT100 escape sequences
These sequences may be written to VT100 terminals to change the colour and style of the text. fprintf(stdout, VTC_RED "This text will be coloured red" VTC_RESET);
#define	VTC_BOLD   "\x1b[1m"
	Embolden following text.
#define	VTC_RED   "\x1b[31m"
	Colour following text red.
#define	VTC_RESET   "\x1b[0m"
	Reset terminal text to default style/colour.
#define	VTC_YELLOW   "\x1b[33m"
	Colour following text yellow.

Detailed Description

Support functions for logging in FreeRADIUS libraries.

Copyright

2003,2006 The FreeRADIUS server project

Definition in file log.c.

Macro Definition Documentation

VTC_BOLD

#define VTC_BOLD   "\x1b[1m"

Embolden following text.

Definition at line 268 of file log.c.

VTC_RED

#define VTC_RED   "\x1b[31m"

Colour following text red.

Definition at line 266 of file log.c.

VTC_RESET

#define VTC_RESET   "\x1b[0m"

Reset terminal text to default style/colour.

Definition at line 269 of file log.c.

VTC_YELLOW

#define VTC_YELLOW   "\x1b[33m"

Colour following text yellow.

Definition at line 267 of file log.c.

Function Documentation

_fr_log_pool_free()

static int _fr_log_pool_free ( void *  arg )

static

Cleanup the memory pool used by vlog_request.

Definition at line 299 of file log.c.

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_restore_std_legacy()

static int _restore_std_legacy ( UNUSED int  sig )

static

On fault, reset STDOUT and STDERR to something useful.

Returns

0

Definition at line 882 of file log.c.

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_syslog_write()

static ssize_t _syslog_write ( UNUSED void *  cookie, const char *  buf, size_t  size  )

static

Write complete lines to syslog.

Definition at line 1098 of file log.c.

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fr_canonicalize_error()

void fr_canonicalize_error	(	TALLOC_CTX *	ctx,
		char **	sp,
		char **	text,
		ssize_t	slen,
		char const *	fmt
	)

Canonicalize error strings, removing tabs, and generate spaces for error marker.

Note

talloc_free must be called on the buffer returned in spaces and text

Used to produce error messages such as this:

 I'm a string with a parser # error
                            ^ Unexpected character in string

With code resembling this:

ERROR("%s", parsed_str);
ERROR("%s^ %s", space, text);

Todo:

merge with above function (log_request_marker)

Parameters

sp	Where to write a dynamically allocated buffer of spaces used to indent the error text.
text	Where to write the canonicalized version of fmt (the error text).
ctx	to allocate the spaces and text buffers in.
slen	of error marker. Expects negative integer value, as returned by parse functions.
fmt	to canonicalize.

Definition at line 87 of file log.c.

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fr_log()

void fr_log	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		char const *	fmt,
			...
	)

Send a server log message to its destination.

Parameters

log	destination.
type	of log message.
file	where the log message originated
line	where the log message originated
fmt	with printf style substitution tokens.
...	Substitution arguments.

Definition at line 577 of file log.c.

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fr_log_close()

int fr_log_close

(

fr_log_t *

log

)

Universal close function for all logging destinations.

Definition at line 1183 of file log.c.

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fr_log_fd_event()

void fr_log_fd_event	(	UNUSED fr_event_list_t *	el,
		int	fd,
		UNUSED int	flags,
		void *	uctx
	)

Function to provide as the readable callback to the event loop.

Writes any data read from a file descriptor to the request log, tries very hard not to chop lines in the middle, but will split at 1024 byte boundaries if forced to.

Parameters

[in]	el	UNUSED
[in]	fd	UNUSED
[in]	flags	UNUSED
[in]	uctx	Pointer to a log_fd_event_ctx_t

Definition at line 176 of file log.c.

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fr_log_global_free()

void fr_log_global_free

(

void

)

Restores the original stdout and stderr FDs, closes the pipes and removes them from the event loop.

Definition at line 1338 of file log.c.

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fr_log_global_init()

int fr_log_global_init	(	fr_event_list_t *	el,
		bool	daemonize
	)

Manipulate stderr and stdout so that was capture all data send to it from libraries.

Parameters

[in]	el	The event list we use to process logging data.
[in]	daemonize	Whether the server is starting as a daemon.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1219 of file log.c.

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fr_log_hex()

void fr_log_hex	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		uint8_t const *	data,
		size_t	data_len,
		char const *	line_prefix_fmt,
			...
	)

Print out hex block.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	data	to print.
[in]	data_len	length of data.
[in]	line_prefix_fmt	Prefix to add to the marker messages.
[in]	...	Arguments for line_prefix_fmt.

Definition at line 778 of file log.c.

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fr_log_hex_marker()

void fr_log_hex_marker	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		uint8_t const *	data,
		size_t	data_len,
		ssize_t	marker_idx,
		char const *	marker,
		char const *	line_prefix_fmt,
			...
	)

Print out hex block.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	data	to print.
[in]	data_len	length of data.
[in]	marker_idx	Where to place the marker. May be negative.
[in]	marker	text to print at marker_idx.
[in]	line_prefix_fmt	Prefix to add to the marker messages.
[in]	...	Arguments for line_prefix_fmt.

Definition at line 825 of file log.c.

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fr_log_init_file()

int fr_log_init_file	(	fr_log_t *	log,
		char const *	file
	)

Initialise a file logging destination.

Parameters

[out]	log	Destination to initialise.
[in]	file	to open handle for.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1077 of file log.c.

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fr_log_init_fp()

int fr_log_init_fp	(	fr_log_t *	log,
		FILE *	fp
	)

Initialise a file logging destination to a FILE*.

Parameters

[out]	log	Destination to initialise.
[in]	fp	pre-existing handle

Returns

• 0 on success.
• -1 on failure.

Definition at line 1056 of file log.c.

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fr_log_init_func()

int fr_log_init_func	(	fr_log_t *	log,
		cookie_write_function_t	write,
		cookie_close_function_t	close,
		void *	uctx
	)

Initialise a function based logging destination.

Note

Cookie functions receive the fr_log_t which contains the uctx, not the uctx directly.

Parameters

[out]	log	Destination to initialise.
[in]	write	Called when a complete log line is ready for writing.
[in]	close	May be NULL. Called when the logging destination has been closed.
[in]	uctx	for the write and close functions.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1159 of file log.c.

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fr_log_init_legacy()

int fr_log_init_legacy	(	fr_log_t *	log,
		bool	daemonize
	)

Initialise file descriptors based on logging destination.

Parameters

log	Logger to manipulate.
daemonize	Whether the server is starting as a daemon.

Returns

• 0 on success.
• -1 on failure.

Definition at line 901 of file log.c.

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fr_log_init_std()

int fr_log_init_std	(	fr_log_t *	log,
		fr_log_dst_t	dst_type
	)

Initialise log dst for stdout, stderr or /dev/null.

Parameters

[out]	log	Destination to initialise.
[in]	dst_type	The specific type of log destination to initialise.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1022 of file log.c.

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fr_log_init_syslog()

int fr_log_init_syslog

(

fr_log_t *

log

)

Initialise a syslog logging destination.

Parameters

[out]

log

Destination to initialise.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1129 of file log.c.

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fr_log_marker()

void fr_log_marker	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		char const *	str,
		size_t	str_len,
		ssize_t	marker_idx,
		char const *	marker,
		char const *	line_prefix_fmt,
			...
	)

Print out an error marker.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	str	Subject string we're printing a marker for.
[in]	str_len	Subject string length. Use SIZE_MAX for the length of the string.
[in]	marker_idx	Where to place the marker. May be negative.
[in]	marker	text to print at marker_idx.
[in]	line_prefix_fmt	Prefix to add to the marker messages.
[in]	...	Arguments for line_prefix_fmt.

Definition at line 728 of file log.c.

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fr_log_perror()

void fr_log_perror	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		fr_log_perror_format_t const *	rules,
		char const *	fmt,
			...
	)

Drain any outstanding messages from the fr_strerror buffers.

This function drains any messages from fr_strerror buffer adding a prefix (fmt) to the first message.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	rules	for printing multiline errors.
[in]	fmt	with printf style substitution tokens.
[in]	...	Substitution arguments.

Definition at line 703 of file log.c.

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fr_log_pool_init()

TALLOC_CTX * fr_log_pool_init

(

void

)

talloc ctx to use when composing log messages

Functions must ensure that they allocate a new ctx from the one returned here, and that this ctx is freed before the function returns.

Returns

talloc pool to use for scratch space.

Definition at line 313 of file log.c.

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fr_vlog()

void fr_vlog	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		char const *	fmt,
		va_list	ap
	)

Send a server log message to its destination.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	fmt	with printf style substitution tokens.
[in]	ap	Substitution arguments.

Definition at line 341 of file log.c.

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fr_vlog_perror()

void fr_vlog_perror	(	fr_log_t const *	log,
		fr_log_type_t	type,
		char const *	file,
		int	line,
		fr_log_perror_format_t const *	f_rules,
		char const *	fmt,
		va_list	ap
	)

Drain any outstanding messages from the fr_strerror buffers.

This function drains any messages from fr_strerror buffer prefixing the first message with fmt + args.

If a prefix is specified in rules, this is prepended to all lines logged. The prefix is useful for adding context, i.e. configuration file and line number information.

Parameters

[in]	log	destination.
[in]	type	of log message.
[in]	file	src file the log message was generated in.
[in]	line	number the log message was generated on.
[in]	f_rules	for printing multiline errors.
[in]	fmt	with printf style substitution tokens.
[in]	ap	Substitution arguments.

Definition at line 608 of file log.c.

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Variable Documentation

colours

fr_table_num_ordered_t const colours[]

static

Initial value:

= {
        { L(VTC_BOLD),                  L_INFO          },
        { L(VTC_RED),                   L_ERR           },
        { L(VTC_BOLD VTC_YELLOW),       L_WARN          },
        { L(VTC_BOLD VTC_RED),          L_DBG_ERR       },
        { L(VTC_BOLD VTC_YELLOW),       L_DBG_WARN      },
        { L(VTC_BOLD VTC_RED),          L_DBG_ERR_REQ   },
        { L(VTC_BOLD VTC_YELLOW),       L_DBG_WARN_REQ  },
}

Maps log categories to VT100 style/colour escape sequences.

Definition at line 274 of file log.c.

colours_len

size_t colours_len = NUM_ELEMENTS(colours)

static

Definition at line 283 of file log.c.

default_log

fr_log_t default_log

Initial value:

= {
        .colourise = false,             
        .fd = STDOUT_FILENO,
        .dst = L_DST_STDOUT,
        .file = NULL,
        .timestamp = L_TIMESTAMP_AUTO
}

Definition at line 288 of file log.c.

devnull

FILE* devnull

static

File handle for /dev/null.

Definition at line 56 of file log.c.

fr_debug_lvl

int fr_debug_lvl = 0

Definition at line 40 of file log.c.

fr_log_fp

FILE* fr_log_fp = NULL

Definition at line 39 of file log.c.

fr_log_levels

fr_table_num_ordered_t const fr_log_levels[]

Initial value:

= {
        { L("Debug : "),                L_DBG           },
        { L("Info  : "),                L_INFO          },
        { L("Warn  : "),                L_WARN          },
        { L("Error : "),                L_ERR           },
        { L("Auth  : "),                L_AUTH          },
        { L("INFO  : "),                L_DBG_INFO      },
        { L("WARN  : "),                L_DBG_WARN      },
        { L("ERROR : "),                L_DBG_ERR       },
        { L("WARN  : "),                L_DBG_WARN_REQ  },
        { L("ERROR : "),                L_DBG_ERR_REQ   }
}

Maps log categories to message prefixes.

Definition at line 242 of file log.c.

fr_log_levels_len

size_t fr_log_levels_len = NUM_ELEMENTS(fr_log_levels)

Definition at line 254 of file log.c.

fr_log_pool

_Thread_local TALLOC_CTX* fr_log_pool

static

Definition at line 42 of file log.c.

fr_log_rate_limit

bool fr_log_rate_limit = true

Whether repeated log entries should be rate limited.

Definition at line 58 of file log.c.

location_indent

uint32_t location_indent = 30

static

Definition at line 44 of file log.c.

log_dates_utc

bool log_dates_utc = false

Definition at line 286 of file log.c.

log_el

fr_event_list_t* log_el

static

Event loop we use for process logging data.

Definition at line 45 of file log.c.

log_msg_type

_Thread_local fr_log_type_t log_msg_type

static

The type of the last message logged.

Mainly uses for syslog.

Definition at line 60 of file log.c.

stderr_ctx

fr_log_fd_event_ctx_t stderr_ctx

static

Logging ctx for stderr.

Definition at line 51 of file log.c.

stderr_fd

int stderr_fd = -1

static

The original unmolested stderr file descriptor.

Definition at line 47 of file log.c.

stderr_pipe

int stderr_pipe[2]

static

Pipe we use to transport stderr data.

Definition at line 54 of file log.c.

stdout_ctx

fr_log_fd_event_ctx_t stdout_ctx

static

Logging ctx for stdout.

Definition at line 50 of file log.c.

stdout_fd

int stdout_fd = -1

static

The original unmolested stdout file descriptor.

Definition at line 48 of file log.c.

stdout_pipe

int stdout_pipe[2]

static

Pipe we use to transport stdout data.

Definition at line 53 of file log.c.