Functions to help with debugging. More...

#include <freeradius-devel/util/backtrace.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/hash.h>
#include <freeradius-devel/util/strerror.h>
#include <freeradius-devel/util/syserror.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/wait.h>

Include dependency graph for debug.c:

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Macros
#define	TALLOC_REPORT_MAX_DEPTH 20

Functions
static int	_disable_null_tracking (UNUSED bool *p)

bool	_fr_assert_fail (char const file, int line, char const expr, char const *msg,...)
	A soft assertion which triggers the fault handler in debug builds.

void	_fr_assert_fatal (char const file, int line, char const expr, char const *msg,...)
	A fatal assertion which triggers the fault handler in debug builds or exits.

NEVER_RETURNS void	_fr_exit (char const *file, int line, int status, bool now)
	Exit possibly printing a message about why we're exiting.

static void	_fr_talloc_fault (char const *reason)
	Callback executed on fatal talloc error.

static void	_fr_talloc_fault_simple (char const *reason)
	Callback executed on fatal talloc error.

static void	_fr_talloc_log (char const *msg)
	Wrapper to pass talloc log output to our fr_fault_log function.

static int	_panic_on_free (UNUSED char *foo)

void	fr_debug_break (bool always)
	Break in debugger (if were running under a debugger)

void	fr_debug_state_store (void)
	Should be run before using setuid or setgid to get useful results.

char const *	fr_debug_state_to_msg (fr_debug_state_t state)
	Return current value of debug_state.

void	fr_disable_null_tracking_on_free (TALLOC_CTX *ctx)
	Disable the null tracking context when a talloc chunk is freed.

NEVER_RETURNS void	fr_fault (int sig)
	Prints a simple backtrace (if execinfo is available) and calls panic_action if set.

static int	fr_fault_check_permissions (void)
	Check to see if panic_action file is world writable.

void	fr_fault_log (char const *msg,...)
	Log output to the fr_fault_log_fd.

void	fr_fault_log_hex (uint8_t const *data, size_t data_len)
	Print data as a hex block.

void	fr_fault_set_cb (fr_fault_cb_t func)
	Set a callback to be called before fr_fault()

void	fr_fault_set_log_fd (int fd)
	Set a file descriptor to log memory reports to.

int	fr_fault_setup (TALLOC_CTX ctx, char const cmd, char const *program)
	Registers signal handlers to execute panic_action on fatal signal.

int	fr_get_debug_state (void)

int	fr_get_lsan_state (void)

static int	fr_get_pr_dumpable_flag (void)
	Get the processes dumpable flag.

int	fr_log_talloc_report (TALLOC_CTX const *ctx)
	Generate a talloc memory report for a context and print to stderr/stdout.

void	fr_panic_on_free (TALLOC_CTX *ctx)
	Insert memory into the context of another talloc memory chunk which causes a panic when freed.

int	fr_reset_dumpable (void)
	Reset dumpable state to previously configured value.

int	fr_set_dumpable (bool allow_core_dumps)
	Enable or disable core dumps.

int	fr_set_dumpable_init (void)
	Get the current maximum for core files.

static int	fr_set_pr_dumpable_flag (UNUSED bool dumpable)
	Set the dumpable flag, also controls whether processes can PATTACH.

void	fr_talloc_fault_setup (void)
	Register talloc fault handlers.

Variables
static bool	dump_core
	Whether we should drop a core on fatal signals.

fr_debug_state_t	fr_debug_state = DEBUGGER_STATE_UNKNOWN
	Whether we're attached to by a debugger.

int	fr_fault_log_fd = STDERR_FILENO
	Where to write debug output.

static char	panic_action [512]
	The command to execute when panicking.

static fr_fault_cb_t	panic_cb = NULL
	Callback to execute whilst panicking, before the panic_action.

static TALLOC_CTX *	talloc_autofree_ctx

Detailed Description

Functions to help with debugging.

Copyright: 2013 The FreeRADIUS server project; 2013 Arran Cudbard-Bell (a.cud.nosp@m.bard.nosp@m.b@fre.nosp@m.erad.nosp@m.ius.o.nosp@m.rg)

Definition in file debug.c.

Macro Definition Documentation

◆ TALLOC_REPORT_MAX_DEPTH

#define TALLOC_REPORT_MAX_DEPTH 20

Function Documentation

◆ _disable_null_tracking()

static int _disable_null_tracking ( UNUSED bool * p )

static

Definition at line 1011 of file debug.c.

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◆ _fr_assert_fail()

bool _fr_assert_fail	(	char const *	file,
		int	line,
		char const *	expr,
		char const *	msg,
			...
	)

A soft assertion which triggers the fault handler in debug builds.

Parameters

[in]	file	the assertion failed in.
[in]	line	of the assertion in the file.
[in]	expr	that was evaluated.
[in]	msg	Message to print (may be NULL).
[in]	...	Arguments for msg string.

Returns: the value of cond.

Definition at line 1246 of file debug.c.

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◆ _fr_assert_fatal()

void _fr_assert_fatal	(	char const *	file,
		int	line,
		char const *	expr,
		char const *	msg,
			...
	)

A fatal assertion which triggers the fault handler in debug builds or exits.

Parameters

[in]	file	the assertion failed in.
[in]	line	of the assertion in the file.
[in]	expr	that was evaluated.
[in]	msg	Message to print (may be NULL).
[in]	...	Arguments for msg string.

Definition at line 1282 of file debug.c.

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◆ _fr_exit()

NEVER_RETURNS void _fr_exit	(	char const *	file,
		int	line,
		int	status,
		bool	now
	)

Exit possibly printing a message about why we're exiting.

Note: Use the fr_exit(status) macro instead of calling this function directly.

Parameters

[in]	file	where fr_exit() was called.
[in]	line	where fr_exit() was called.
[in]	status	we're exiting with.
[in]	now	Exit immediately.

Definition at line 1314 of file debug.c.

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◆ _fr_talloc_fault()

static void _fr_talloc_fault ( char const * reason )

static

Callback executed on fatal talloc error.

Translates a talloc abort into a fr_fault call. Mostly to work around issues with some debuggers not being able to attach after a SIGABRT has been raised.

Parameters

reason string provided by talloc.

Definition at line 940 of file debug.c.

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◆ _fr_talloc_fault_simple()

static void _fr_talloc_fault_simple ( char const * reason )

static

Callback executed on fatal talloc error.

This is the simple version which mostly behaves the same way as the default one, and will not call panic_action.

Parameters

reason string provided by talloc.

Definition at line 923 of file debug.c.

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◆ _fr_talloc_log()

static void _fr_talloc_log ( char const * msg )

static

Wrapper to pass talloc log output to our fr_fault_log function.

Definition at line 952 of file debug.c.

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◆ _panic_on_free()

static int _panic_on_free ( UNUSED char * foo )

static

Definition at line 553 of file debug.c.

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◆ fr_debug_break()

void fr_debug_break ( bool always )

Break in debugger (if were running under a debugger)

If the server is running under a debugger this will raise a SIGTRAP which will pause the running process.

If the server is not running under debugger then this will do nothing.

Definition at line 540 of file debug.c.

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◆ fr_debug_state_store()

void fr_debug_state_store ( void )

Should be run before using setuid or setgid to get useful results.

Note: sets the fr_debug_state global.

Definition at line 491 of file debug.c.

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◆ fr_debug_state_to_msg()

char const * fr_debug_state_to_msg ( fr_debug_state_t state )

Return current value of debug_state.

Parameters

state to translate into a humanly readable value.

Returns: humanly readable version of debug state.

Definition at line 511 of file debug.c.

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◆ fr_disable_null_tracking_on_free()

void fr_disable_null_tracking_on_free ( TALLOC_CTX * ctx )

Disable the null tracking context when a talloc chunk is freed.

Definition at line 1020 of file debug.c.

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◆ fr_fault()

NEVER_RETURNS void fr_fault ( int sig )

Prints a simple backtrace (if execinfo is available) and calls panic_action if set.

Parameters

sig caught

Definition at line 798 of file debug.c.

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◆ fr_fault_check_permissions()

static int fr_fault_check_permissions ( void )

static

Check to see if panic_action file is world writable.

Returns

0 if file is OK.
-1 if the file is world writable.

Definition at line 753 of file debug.c.

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◆ fr_fault_log()

void fr_fault_log	(	char const *	msg,
			...
	)

Log output to the fr_fault_log_fd.

We used to support a user defined callback, which was set to a radlog function. Unfortunately, when logging to syslog, syslog would alloc memory which would result in a deadlock if fr_fault was triggered from within a allocation call.

Now we just write directly to the FD.

Definition at line 1198 of file debug.c.

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◆ fr_fault_log_hex()

void fr_fault_log_hex	(	uint8_t const *	data,
		size_t	data_len
	)

Print data as a hex block.

Definition at line 1212 of file debug.c.

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◆ fr_fault_set_cb()

void fr_fault_set_cb ( fr_fault_cb_t func )

Set a callback to be called before fr_fault()

Parameters

func	to execute. If callback returns < 0 fr_fault will exit before running panic_action code.

Definition at line 1184 of file debug.c.

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◆ fr_fault_set_log_fd()

void fr_fault_set_log_fd ( int fd )

Set a file descriptor to log memory reports to.

Parameters

fd	to write output to.

Definition at line 1232 of file debug.c.

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◆ fr_fault_setup()

int fr_fault_setup	(	TALLOC_CTX *	ctx,
		char const *	cmd,
		char const *	program
	)

Registers signal handlers to execute panic_action on fatal signal.

May be called multiple time to change the panic_action/program.

Parameters

[in]	ctx	to allocate autofreeable resources in.
[in]	cmd	to execute on fault. If present p will be substituted for the parent PID before the command is executed, and e will be substituted for the currently running program.
	program	Name of program currently executing (argv[0]).

Returns

0 on success.
-1 on failure.

Definition at line 1055 of file debug.c.

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◆ fr_get_debug_state()

int fr_get_debug_state ( void )

Definition at line 479 of file debug.c.

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◆ fr_get_lsan_state()

int fr_get_lsan_state ( void )

Definition at line 231 of file debug.c.

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◆ fr_get_pr_dumpable_flag()

static int fr_get_pr_dumpable_flag ( void )

static

Get the processes dumpable flag.

Definition at line 647 of file debug.c.

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◆ fr_log_talloc_report()

int fr_log_talloc_report ( TALLOC_CTX const * ctx )

Generate a talloc memory report for a context and print to stderr/stdout.

Parameters

ctx	to generate a report for, may be NULL in which case the root context is used.

Definition at line 961 of file debug.c.

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◆ fr_panic_on_free()

void fr_panic_on_free ( TALLOC_CTX * ctx )

Insert memory into the context of another talloc memory chunk which causes a panic when freed.

Parameters

ctx	TALLOC_CTX to monitor for frees.

Definition at line 564 of file debug.c.

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◆ fr_reset_dumpable()

int fr_reset_dumpable ( void )

Reset dumpable state to previously configured value.

Needed after suid up/down

Returns

0 on success.
-1 on failure.

Definition at line 742 of file debug.c.

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◆ fr_set_dumpable()

int fr_set_dumpable ( bool allow_core_dumps )

Enable or disable core dumps.

Parameters

allow_core_dumps whether to enable or disable core dumps.

Definition at line 674 of file debug.c.

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◆ fr_set_dumpable_init()

int fr_set_dumpable_init ( void )

Get the current maximum for core files.

Do this before anything else so as to ensure it's properly initialized.

Definition at line 659 of file debug.c.

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◆ fr_set_pr_dumpable_flag()

static int fr_set_pr_dumpable_flag ( UNUSED bool dumpable )

static

Set the dumpable flag, also controls whether processes can PATTACH.

Parameters

dumpable whether we should allow core dumping

Definition at line 601 of file debug.c.

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◆ fr_talloc_fault_setup()

void fr_talloc_fault_setup ( void )

Register talloc fault handlers.

Just register the fault handlers we need to make talloc produce useful debugging output.

Definition at line 1036 of file debug.c.

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Variable Documentation

◆ dump_core

bool dump_core

static

Whether we should drop a core on fatal signals.

Definition at line 70 of file debug.c.

◆ fr_debug_state

fr_debug_state_t fr_debug_state = DEBUGGER_STATE_UNKNOWN

Whether we're attached to by a debugger.

Definition at line 74 of file debug.c.

◆ fr_fault_log_fd

int fr_fault_log_fd = STDERR_FILENO

Where to write debug output.

Definition at line 72 of file debug.c.

◆ panic_action

char panic_action[512]

static

The command to execute when panicking.

Definition at line 66 of file debug.c.

◆ panic_cb

fr_fault_cb_t panic_cb = NULL

static

Callback to execute whilst panicking, before the panic_action.

Definition at line 67 of file debug.c.

◆ talloc_autofree_ctx

TALLOC_CTX* talloc_autofree_ctx

static

Definition at line 80 of file debug.c.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ TALLOC_REPORT_MAX_DEPTH

Function Documentation

◆ _disable_null_tracking()

◆ _fr_assert_fail()

◆ _fr_assert_fatal()

◆ _fr_exit()

◆ _fr_talloc_fault()

◆ _fr_talloc_fault_simple()

◆ _fr_talloc_log()

◆ _panic_on_free()

◆ fr_debug_break()

◆ fr_debug_state_store()

◆ fr_debug_state_to_msg()

◆ fr_disable_null_tracking_on_free()

◆ fr_fault()

◆ fr_fault_check_permissions()

◆ fr_fault_log()

◆ fr_fault_log_hex()

◆ fr_fault_set_cb()

◆ fr_fault_set_log_fd()

◆ fr_fault_setup()

◆ fr_get_debug_state()

◆ fr_get_lsan_state()

◆ fr_get_pr_dumpable_flag()

◆ fr_log_talloc_report()

◆ fr_panic_on_free()

◆ fr_reset_dumpable()

◆ fr_set_dumpable()

◆ fr_set_dumpable_init()

◆ fr_set_pr_dumpable_flag()

◆ fr_talloc_fault_setup()

Variable Documentation

◆ dump_core

◆ fr_debug_state

◆ fr_fault_log_fd

◆ panic_action

◆ panic_cb

◆ talloc_autofree_ctx