log.c - platform/external/openssh - Gitiles

 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
  *
  * As far as I am concerned, the code I have written for this software
  * can be used freely for any purpose.  Any derived versions of this
  * software must be clearly marked as such, and if the derived work is
  * incompatible with the protocol description in the RFC file, it must be
  * called by a name other than "ssh" or "Secure Shell".
  */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "includes.h"
 RCSID("$OpenBSD: log.c,v 1.28 2003/05/24 09:02:22 djm Exp $");

 #include "log.h"
 #include "xmalloc.h"

 #include <syslog.h>

 static LogLevel log_level = SYSLOG_LEVEL_INFO;
 static int log_on_stderr = 1;
 static int log_facility = LOG_AUTH;
 static char *argv0;

 extern char *__progname;

 /* textual representation of log-facilities/levels */

 static struct {
 	const char *name;
 	SyslogFacility val;
 } log_facilities[] = {
 	{ "DAEMON",	SYSLOG_FACILITY_DAEMON },
 	{ "USER",	SYSLOG_FACILITY_USER },
 	{ "AUTH",	SYSLOG_FACILITY_AUTH },
 #ifdef LOG_AUTHPRIV
 	{ "AUTHPRIV",	SYSLOG_FACILITY_AUTHPRIV },
 #endif
 	{ "LOCAL0",	SYSLOG_FACILITY_LOCAL0 },
 	{ "LOCAL1",	SYSLOG_FACILITY_LOCAL1 },
 	{ "LOCAL2",	SYSLOG_FACILITY_LOCAL2 },
 	{ "LOCAL3",	SYSLOG_FACILITY_LOCAL3 },
 	{ "LOCAL4",	SYSLOG_FACILITY_LOCAL4 },
 	{ "LOCAL5",	SYSLOG_FACILITY_LOCAL5 },
 	{ "LOCAL6",	SYSLOG_FACILITY_LOCAL6 },
 	{ "LOCAL7",	SYSLOG_FACILITY_LOCAL7 },
 	{ NULL,		SYSLOG_FACILITY_NOT_SET }
 };

 static struct {
 	const char *name;
 	LogLevel val;
 } log_levels[] =
 {
 	{ "QUIET",	SYSLOG_LEVEL_QUIET },
 	{ "FATAL",	SYSLOG_LEVEL_FATAL },
 	{ "ERROR",	SYSLOG_LEVEL_ERROR },
 	{ "INFO",	SYSLOG_LEVEL_INFO },
 	{ "VERBOSE",	SYSLOG_LEVEL_VERBOSE },
 	{ "DEBUG",	SYSLOG_LEVEL_DEBUG1 },
 	{ "DEBUG1",	SYSLOG_LEVEL_DEBUG1 },
 	{ "DEBUG2",	SYSLOG_LEVEL_DEBUG2 },
 	{ "DEBUG3",	SYSLOG_LEVEL_DEBUG3 },
 	{ NULL,		SYSLOG_LEVEL_NOT_SET }
 };

 SyslogFacility
 log_facility_number(char *name)
 {
 	int i;

 	if (name != NULL)
 		for (i = 0; log_facilities[i].name; i++)
 			if (strcasecmp(log_facilities[i].name, name) == 0)
 				return log_facilities[i].val;
 	return SYSLOG_FACILITY_NOT_SET;
 }

 LogLevel
 log_level_number(char *name)
 {
 	int i;

 	if (name != NULL)
 		for (i = 0; log_levels[i].name; i++)
 			if (strcasecmp(log_levels[i].name, name) == 0)
 				return log_levels[i].val;
 	return SYSLOG_LEVEL_NOT_SET;
 }

 /* Error messages that should be logged. */

 void
 error(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_ERROR, fmt, args);
 	va_end(args);
 }

 /* Log this message (information that usually should go to the log). */

 void
 logit(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_INFO, fmt, args);
 	va_end(args);
 }

 /* More detailed messages (information that does not need to go to the log). */

 void
 verbose(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
 	va_end(args);
 }

 /* Debugging messages that should not be logged during normal operation. */

 void
 debug(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
 	va_end(args);
 }

 void
 debug2(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
 	va_end(args);
 }

 void
 debug3(const char *fmt,...)
 {
 	va_list args;

 	va_start(args, fmt);
 	do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
 	va_end(args);
 }

 /* Fatal cleanup */

 struct fatal_cleanup {
 	struct fatal_cleanup *next;
 	void (*proc) (void *);
 	void *context;
 };

 static struct fatal_cleanup *fatal_cleanups = NULL;

 /* Registers a cleanup function to be called by fatal() before exiting. */

 void
 fatal_add_cleanup(void (*proc) (void *), void *context)
 {
 	struct fatal_cleanup *cu;

 	cu = xmalloc(sizeof(*cu));
 	cu->proc = proc;
 	cu->context = context;
 	cu->next = fatal_cleanups;
 	fatal_cleanups = cu;
 }

 /* Removes a cleanup frunction to be called at fatal(). */

 void
 fatal_remove_cleanup(void (*proc) (void *context), void *context)
 {
 	struct fatal_cleanup **cup, *cu;

 	for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
 		cu = *cup;
 		if (cu->proc == proc && cu->context == context) {
 			*cup = cu->next;
 			xfree(cu);
 			return;
 		}
 	}
 	fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx",
 	    (u_long) proc, (u_long) context);
 }

 /* Remove all cleanups, to be called after fork() */
 void
 fatal_remove_all_cleanups(void)
 {
 	struct fatal_cleanup *cu, *next_cu;

 	for (cu = fatal_cleanups; cu; cu = next_cu) {
 		next_cu = cu->next;
 		xfree(cu);
 	}
 	fatal_cleanups = NULL;
 }

 /* Cleanup and exit */
 void
 fatal_cleanup(void)
 {
 	struct fatal_cleanup *cu, *next_cu;
 	static int called = 0;

 	if (called)
 		exit(255);
 	called = 1;
 	/* Call cleanup functions. */
 	for (cu = fatal_cleanups; cu; cu = next_cu) {
 		next_cu = cu->next;
 		debug("Calling cleanup 0x%lx(0x%lx)",
 		    (u_long) cu->proc, (u_long) cu->context);
 		(*cu->proc) (cu->context);
 	}
 	exit(255);
 }


 /*
  * Initialize the log.
  */

 void
 log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
 {
 	argv0 = av0;

 	switch (level) {
 	case SYSLOG_LEVEL_QUIET:
 	case SYSLOG_LEVEL_FATAL:
 	case SYSLOG_LEVEL_ERROR:
 	case SYSLOG_LEVEL_INFO:
 	case SYSLOG_LEVEL_VERBOSE:
 	case SYSLOG_LEVEL_DEBUG1:
 	case SYSLOG_LEVEL_DEBUG2:
 	case SYSLOG_LEVEL_DEBUG3:
 		log_level = level;
 		break;
 	default:
 		fprintf(stderr, "Unrecognized internal syslog level code %d\n",
 		    (int) level);
 		exit(1);
 	}

 	log_on_stderr = on_stderr;
 	if (on_stderr)
 		return;

 	switch (facility) {
 	case SYSLOG_FACILITY_DAEMON:
 		log_facility = LOG_DAEMON;
 		break;
 	case SYSLOG_FACILITY_USER:
 		log_facility = LOG_USER;
 		break;
 	case SYSLOG_FACILITY_AUTH:
 		log_facility = LOG_AUTH;
 		break;
 #ifdef LOG_AUTHPRIV
 	case SYSLOG_FACILITY_AUTHPRIV:
 		log_facility = LOG_AUTHPRIV;
 		break;
 #endif
 	case SYSLOG_FACILITY_LOCAL0:
 		log_facility = LOG_LOCAL0;
 		break;
 	case SYSLOG_FACILITY_LOCAL1:
 		log_facility = LOG_LOCAL1;
 		break;
 	case SYSLOG_FACILITY_LOCAL2:
 		log_facility = LOG_LOCAL2;
 		break;
 	case SYSLOG_FACILITY_LOCAL3:
 		log_facility = LOG_LOCAL3;
 		break;
 	case SYSLOG_FACILITY_LOCAL4:
 		log_facility = LOG_LOCAL4;
 		break;
 	case SYSLOG_FACILITY_LOCAL5:
 		log_facility = LOG_LOCAL5;
 		break;
 	case SYSLOG_FACILITY_LOCAL6:
 		log_facility = LOG_LOCAL6;
 		break;
 	case SYSLOG_FACILITY_LOCAL7:
 		log_facility = LOG_LOCAL7;
 		break;
 	default:
 		fprintf(stderr,
 		    "Unrecognized internal syslog facility code %d\n",
 		    (int) facility);
 		exit(1);
 	}
 }

 #define MSGBUFSIZ 1024

 void
 do_log(LogLevel level, const char *fmt, va_list args)
 {
 #ifdef OPENLOG_R
 	struct syslog_data sdata = SYSLOG_DATA_INIT;
 #endif
 	char msgbuf[MSGBUFSIZ];
 	char fmtbuf[MSGBUFSIZ];
 	char *txt = NULL;
 	int pri = LOG_INFO;

 	if (level > log_level)
 		return;

 	switch (level) {
 	case SYSLOG_LEVEL_FATAL:
 		if (!log_on_stderr)
 			txt = "fatal";
 		pri = LOG_CRIT;
 		break;
 	case SYSLOG_LEVEL_ERROR:
 		if (!log_on_stderr)
 			txt = "error";
 		pri = LOG_ERR;
 		break;
 	case SYSLOG_LEVEL_INFO:
 		pri = LOG_INFO;
 		break;
 	case SYSLOG_LEVEL_VERBOSE:
 		pri = LOG_INFO;
 		break;
 	case SYSLOG_LEVEL_DEBUG1:
 		txt = "debug1";
 		pri = LOG_DEBUG;
 		break;
 	case SYSLOG_LEVEL_DEBUG2:
 		txt = "debug2";
 		pri = LOG_DEBUG;
 		break;
 	case SYSLOG_LEVEL_DEBUG3:
 		txt = "debug3";
 		pri = LOG_DEBUG;
 		break;
 	default:
 		txt = "internal error";
 		pri = LOG_ERR;
 		break;
 	}
 	if (txt != NULL) {
 		snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
 		vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
 	} else {
 		vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
 	}
 	strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE|VIS_OCTAL);
 	if (log_on_stderr) {
 		snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
 		write(STDERR_FILENO, msgbuf, strlen(msgbuf));
 	} else {
 #ifdef OPENLOG_R
 		openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
 		syslog_r(pri, &sdata, "%.500s", fmtbuf);
 		closelog_r(&sdata);
 #else
 		openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
 		syslog(pri, "%.500s", fmtbuf);
 		closelog();
 #endif
 	}
 }
	/*
	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	* All rights reserved
	*
	* As far as I am concerned, the code I have written for this software
	* can be used freely for any purpose. Any derived versions of this
	* software must be clearly marked as such, and if the derived work is
	* incompatible with the protocol description in the RFC file, it must be
	* called by a name other than "ssh" or "Secure Shell".
	*/
	/*
	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "includes.h"
	RCSID("$OpenBSD: log.c,v 1.28 2003/05/24 09:02:22 djm Exp $");

	#include "log.h"
	#include "xmalloc.h"

	#include <syslog.h>

	static LogLevel log_level = SYSLOG_LEVEL_INFO;
	static int log_on_stderr = 1;
	static int log_facility = LOG_AUTH;
	static char *argv0;

	extern char *__progname;

	/* textual representation of log-facilities/levels */

	static struct {
	const char *name;
	SyslogFacility val;
	} log_facilities[] = {
	{ "DAEMON", SYSLOG_FACILITY_DAEMON },
	{ "USER", SYSLOG_FACILITY_USER },
	{ "AUTH", SYSLOG_FACILITY_AUTH },
	#ifdef LOG_AUTHPRIV
	{ "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV },
	#endif
	{ "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
	{ "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
	{ "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
	{ "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
	{ "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
	{ "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
	{ "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
	{ "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
	{ NULL, SYSLOG_FACILITY_NOT_SET }
	};

	static struct {
	const char *name;
	LogLevel val;
	} log_levels[] =
	{
	{ "QUIET", SYSLOG_LEVEL_QUIET },
	{ "FATAL", SYSLOG_LEVEL_FATAL },
	{ "ERROR", SYSLOG_LEVEL_ERROR },
	{ "INFO", SYSLOG_LEVEL_INFO },
	{ "VERBOSE", SYSLOG_LEVEL_VERBOSE },
	{ "DEBUG", SYSLOG_LEVEL_DEBUG1 },
	{ "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
	{ "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
	{ "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
	{ NULL, SYSLOG_LEVEL_NOT_SET }
	};

	SyslogFacility
	log_facility_number(char *name)
	{
	int i;

	if (name != NULL)
	for (i = 0; log_facilities[i].name; i++)
	if (strcasecmp(log_facilities[i].name, name) == 0)
	return log_facilities[i].val;
	return SYSLOG_FACILITY_NOT_SET;
	}

	LogLevel
	log_level_number(char *name)
	{
	int i;

	if (name != NULL)
	for (i = 0; log_levels[i].name; i++)
	if (strcasecmp(log_levels[i].name, name) == 0)
	return log_levels[i].val;
	return SYSLOG_LEVEL_NOT_SET;
	}

	/* Error messages that should be logged. */

	void
	error(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_ERROR, fmt, args);
	va_end(args);
	}

	/* Log this message (information that usually should go to the log). */

	void
	logit(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_INFO, fmt, args);
	va_end(args);
	}

	/* More detailed messages (information that does not need to go to the log). */

	void
	verbose(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
	va_end(args);
	}

	/* Debugging messages that should not be logged during normal operation. */

	void
	debug(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
	va_end(args);
	}

	void
	debug2(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
	va_end(args);
	}

	void
	debug3(const char *fmt,...)
	{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
	va_end(args);
	}

	/* Fatal cleanup */

	struct fatal_cleanup {
	struct fatal_cleanup *next;
	void (proc) (void );
	void *context;
	};

	static struct fatal_cleanup *fatal_cleanups = NULL;

	/* Registers a cleanup function to be called by fatal() before exiting. */

	void
	fatal_add_cleanup(void (proc) (void ), void *context)
	{
	struct fatal_cleanup *cu;

	cu = xmalloc(sizeof(*cu));
	cu->proc = proc;
	cu->context = context;
	cu->next = fatal_cleanups;
	fatal_cleanups = cu;
	}

	/* Removes a cleanup frunction to be called at fatal(). */

	void
	fatal_remove_cleanup(void (proc) (void context), void *context)
	{
	struct fatal_cleanup *cup, cu;

	for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
	cu = *cup;
	if (cu->proc == proc && cu->context == context) {
	*cup = cu->next;
	xfree(cu);
	return;
	}
	}
	fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx",
	(u_long) proc, (u_long) context);
	}

	/* Remove all cleanups, to be called after fork() */
	void
	fatal_remove_all_cleanups(void)
	{
	struct fatal_cleanup cu, next_cu;

	for (cu = fatal_cleanups; cu; cu = next_cu) {
	next_cu = cu->next;
	xfree(cu);
	}
	fatal_cleanups = NULL;
	}

	/* Cleanup and exit */
	void
	fatal_cleanup(void)
	{
	struct fatal_cleanup cu, next_cu;
	static int called = 0;

	if (called)
	exit(255);
	called = 1;
	/* Call cleanup functions. */
	for (cu = fatal_cleanups; cu; cu = next_cu) {
	next_cu = cu->next;
	debug("Calling cleanup 0x%lx(0x%lx)",
	(u_long) cu->proc, (u_long) cu->context);
	(*cu->proc) (cu->context);
	}
	exit(255);
	}


	/*
	* Initialize the log.
	*/

	void
	log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
	{
	argv0 = av0;

	switch (level) {
	case SYSLOG_LEVEL_QUIET:
	case SYSLOG_LEVEL_FATAL:
	case SYSLOG_LEVEL_ERROR:
	case SYSLOG_LEVEL_INFO:
	case SYSLOG_LEVEL_VERBOSE:
	case SYSLOG_LEVEL_DEBUG1:
	case SYSLOG_LEVEL_DEBUG2:
	case SYSLOG_LEVEL_DEBUG3:
	log_level = level;
	break;
	default:
	fprintf(stderr, "Unrecognized internal syslog level code %d\n",
	(int) level);
	exit(1);
	}

	log_on_stderr = on_stderr;
	if (on_stderr)
	return;

	switch (facility) {
	case SYSLOG_FACILITY_DAEMON:
	log_facility = LOG_DAEMON;
	break;
	case SYSLOG_FACILITY_USER:
	log_facility = LOG_USER;
	break;
	case SYSLOG_FACILITY_AUTH:
	log_facility = LOG_AUTH;
	break;
	#ifdef LOG_AUTHPRIV
	case SYSLOG_FACILITY_AUTHPRIV:
	log_facility = LOG_AUTHPRIV;
	break;
	#endif
	case SYSLOG_FACILITY_LOCAL0:
	log_facility = LOG_LOCAL0;
	break;
	case SYSLOG_FACILITY_LOCAL1:
	log_facility = LOG_LOCAL1;
	break;
	case SYSLOG_FACILITY_LOCAL2:
	log_facility = LOG_LOCAL2;
	break;
	case SYSLOG_FACILITY_LOCAL3:
	log_facility = LOG_LOCAL3;
	break;
	case SYSLOG_FACILITY_LOCAL4:
	log_facility = LOG_LOCAL4;
	break;
	case SYSLOG_FACILITY_LOCAL5:
	log_facility = LOG_LOCAL5;
	break;
	case SYSLOG_FACILITY_LOCAL6:
	log_facility = LOG_LOCAL6;
	break;
	case SYSLOG_FACILITY_LOCAL7:
	log_facility = LOG_LOCAL7;
	break;
	default:
	fprintf(stderr,
	"Unrecognized internal syslog facility code %d\n",
	(int) facility);
	exit(1);
	}
	}

	#define MSGBUFSIZ 1024

	void
	do_log(LogLevel level, const char *fmt, va_list args)
	{
	#ifdef OPENLOG_R
	struct syslog_data sdata = SYSLOG_DATA_INIT;
	#endif
	char msgbuf[MSGBUFSIZ];
	char fmtbuf[MSGBUFSIZ];
	char *txt = NULL;
	int pri = LOG_INFO;

	if (level > log_level)
	return;

	switch (level) {
	case SYSLOG_LEVEL_FATAL:
	if (!log_on_stderr)
	txt = "fatal";
	pri = LOG_CRIT;
	break;
	case SYSLOG_LEVEL_ERROR:
	if (!log_on_stderr)
	txt = "error";
	pri = LOG_ERR;
	break;
	case SYSLOG_LEVEL_INFO:
	pri = LOG_INFO;
	break;
	case SYSLOG_LEVEL_VERBOSE:
	pri = LOG_INFO;
	break;
	case SYSLOG_LEVEL_DEBUG1:
	txt = "debug1";
	pri = LOG_DEBUG;
	break;
	case SYSLOG_LEVEL_DEBUG2:
	txt = "debug2";
	pri = LOG_DEBUG;
	break;
	case SYSLOG_LEVEL_DEBUG3:
	txt = "debug3";
	pri = LOG_DEBUG;
	break;
	default:
	txt = "internal error";
	pri = LOG_ERR;
	break;
	}
	if (txt != NULL) {
	snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
	vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
	} else {
	vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
	}
	strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE\|VIS_OCTAL);
	if (log_on_stderr) {
	snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
	write(STDERR_FILENO, msgbuf, strlen(msgbuf));
	} else {
	#ifdef OPENLOG_R
	openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
	syslog_r(pri, &sdata, "%.500s", fmtbuf);
	closelog_r(&sdata);
	#else
	openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
	syslog(pri, "%.500s", fmtbuf);
	closelog();
	#endif
	}
	}