Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../log.c	Lines:	17	131	13.0 %
Date:	2017-11-13	Branches:	1	62	1.6 %


/* $OpenBSD: log.c,v 1.50 2017/05/17 01:24:17 djm Exp $ */
/*
 * 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 <sys/types.h>

#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <errno.h>
#include <vis.h>

#include "log.h"

static LogLevel log_level = SYSLOG_LEVEL_INFO;
static int log_on_stderr = 1;
static int log_stderr_fd = STDERR_FILENO;
static int log_facility = LOG_AUTH;
static char *argv0;
static log_handler_fn *log_handler;
static void *log_handler_ctx;

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 },
	{ "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;
}

const char *
log_facility_name(SyslogFacility facility)
{
	u_int i;

	for (i = 0;  log_facilities[i].name; i++)
		if (log_facilities[i].val == facility)
			return log_facilities[i].name;
	return NULL;
}

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;
}

const char *
log_level_name(LogLevel level)
{
	u_int i;

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

/* 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);
}

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

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	va_end(args);
	_exit(1);
}

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

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_INFO, fmt, args);
	va_end(args);
	cleanup_exit(255);
}

/* 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);
}

/*
 * Initialize the log.
 */

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

	if (log_change_level(level) != 0) {
		fprintf(stderr, "Unrecognized internal syslog level code %d\n",
		    (int) level);
		exit(1);
	}

	log_handler = NULL;
	log_handler_ctx = NULL;

	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;
	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);
	}
}

int
log_change_level(LogLevel new_log_level)
{
	/* no-op if log_init has not been called */
	if (argv0 == NULL)
		return 0;

	switch (new_log_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 = new_log_level;
		return 0;
	default:
		return -1;
	}
}

int
log_is_on_stderr(void)
{
	return log_on_stderr && log_stderr_fd == STDERR_FILENO;
}

/* redirect what would usually get written to stderr to specified file */
void
log_redirect_stderr_to(const char *logfile)
{
	int fd;

	if ((fd = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0600)) == -1) {
		fprintf(stderr, "Couldn't open logfile %s: %s\n", logfile,
		     strerror(errno));
		exit(1);
	}
	log_stderr_fd = fd;
}

#define MSGBUFSIZ 1024

void
set_log_handler(log_handler_fn *handler, void *ctx)
{
	log_handler = handler;
	log_handler_ctx = ctx;
}

void
do_log2(LogLevel level, const char *fmt,...)
{
	va_list args;

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

void
do_log(LogLevel level, const char *fmt, va_list args)
{
	struct syslog_data sdata = SYSLOG_DATA_INIT;
	char msgbuf[MSGBUFSIZ];
	char fmtbuf[MSGBUFSIZ];
	char *txt = NULL;
	int pri = LOG_INFO;
	int saved_errno = errno;
	log_handler_fn *tmp_handler;

	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 && log_handler == 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_handler != NULL) {
		/* Avoid recursion */
		tmp_handler = log_handler;
		log_handler = NULL;
		tmp_handler(level, fmtbuf, log_handler_ctx);
		log_handler = tmp_handler;
	} else if (log_on_stderr) {
		snprintf(msgbuf, sizeof msgbuf, "%.*s\r\n",
		    (int)sizeof msgbuf - 3, fmtbuf);
		(void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
	} else {
		openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
		syslog_r(pri, &sdata, "%.500s", fmtbuf);
		closelog_r(&sdata);
	}
	errno = saved_errno;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: log.c,v 1.50 2017/05/17 01:24:17 djm Exp $ */
2			/*
3			* Author: Tatu Ylonen <ylo@cs.hut.fi>
4			* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5			* All rights reserved
6			*
7			* As far as I am concerned, the code I have written for this software
8			* can be used freely for any purpose. Any derived versions of this
9			* software must be clearly marked as such, and if the derived work is
10			* incompatible with the protocol description in the RFC file, it must be
11			* called by a name other than "ssh" or "Secure Shell".
12			*/
13			/*
14			* Copyright (c) 2000 Markus Friedl. All rights reserved.
15			*
16			* Redistribution and use in source and binary forms, with or without
17			* modification, are permitted provided that the following conditions
18			* are met:
19			* 1. Redistributions of source code must retain the above copyright
20			* notice, this list of conditions and the following disclaimer.
21			* 2. Redistributions in binary form must reproduce the above copyright
22			* notice, this list of conditions and the following disclaimer in the
23			* documentation and/or other materials provided with the distribution.
24			*
25			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35			*/
36
37			#include <sys/types.h>
38
39			#include <fcntl.h>
40			#include <stdarg.h>
41			#include <stdio.h>
42			#include <stdlib.h>
43			#include <string.h>
44			#include <syslog.h>
45			#include <unistd.h>
46			#include <errno.h>
47			#include <vis.h>
48
49			#include "log.h"
50
51			static LogLevel log_level = SYSLOG_LEVEL_INFO;
52			static int log_on_stderr = 1;
53			static int log_stderr_fd = STDERR_FILENO;
54			static int log_facility = LOG_AUTH;
55			static char *argv0;
56			static log_handler_fn *log_handler;
57			static void *log_handler_ctx;
58
59			extern char *__progname;
60
61			/* textual representation of log-facilities/levels */
62
63			static struct {
64			const char *name;
65			SyslogFacility val;
66			} log_facilities[] = {
67			{ "DAEMON", SYSLOG_FACILITY_DAEMON },
68			{ "USER", SYSLOG_FACILITY_USER },
69			{ "AUTH", SYSLOG_FACILITY_AUTH },
70			{ "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
71			{ "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
72			{ "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
73			{ "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
74			{ "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
75			{ "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
76			{ "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
77			{ "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
78			{ NULL, SYSLOG_FACILITY_NOT_SET }
79			};
80
81			static struct {
82			const char *name;
83			LogLevel val;
84			} log_levels[] =
85			{
86			{ "QUIET", SYSLOG_LEVEL_QUIET },
87			{ "FATAL", SYSLOG_LEVEL_FATAL },
88			{ "ERROR", SYSLOG_LEVEL_ERROR },
89			{ "INFO", SYSLOG_LEVEL_INFO },
90			{ "VERBOSE", SYSLOG_LEVEL_VERBOSE },
91			{ "DEBUG", SYSLOG_LEVEL_DEBUG1 },
92			{ "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
93			{ "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
94			{ "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
95			{ NULL, SYSLOG_LEVEL_NOT_SET }
96			};
97
98			SyslogFacility
99			log_facility_number(char *name)
100			{
101			int i;
102
103			if (name != NULL)
104			for (i = 0; log_facilities[i].name; i++)
105			if (strcasecmp(log_facilities[i].name, name) == 0)
106			return log_facilities[i].val;
107			return SYSLOG_FACILITY_NOT_SET;
108			}
109
110			const char *
111			log_facility_name(SyslogFacility facility)
112			{
113			u_int i;
114
115			for (i = 0; log_facilities[i].name; i++)
116			if (log_facilities[i].val == facility)
117			return log_facilities[i].name;
118			return NULL;
119			}
120
121			LogLevel
122			log_level_number(char *name)
123			{
124			int i;
125
126			if (name != NULL)
127			for (i = 0; log_levels[i].name; i++)
128			if (strcasecmp(log_levels[i].name, name) == 0)
129			return log_levels[i].val;
130			return SYSLOG_LEVEL_NOT_SET;
131			}
132
133			const char *
134			log_level_name(LogLevel level)
135			{
136			u_int i;
137
138			for (i = 0; log_levels[i].name != NULL; i++)
139			if (log_levels[i].val == level)
140			return log_levels[i].name;
141			return NULL;
142			}
143
144			/* Error messages that should be logged. */
145
146			void
147			error(const char *fmt,...)
148			{
149			va_list args;
150
151			va_start(args, fmt);
152			do_log(SYSLOG_LEVEL_ERROR, fmt, args);
153			va_end(args);
154			}
155
156			void
157			sigdie(const char *fmt,...)
158			{
159			va_list args;
160
161			va_start(args, fmt);
162			do_log(SYSLOG_LEVEL_FATAL, fmt, args);
163			va_end(args);
164			_exit(1);
165			}
166
167			void
168			logdie(const char *fmt,...)
169			{
170			va_list args;
171
172			va_start(args, fmt);
173			do_log(SYSLOG_LEVEL_INFO, fmt, args);
174			va_end(args);
175			cleanup_exit(255);
176			}
177
178			/* Log this message (information that usually should go to the log). */
179
180			void
181			logit(const char *fmt,...)
182			{
183			va_list args;
184
185			va_start(args, fmt);
186			do_log(SYSLOG_LEVEL_INFO, fmt, args);
187			va_end(args);
188			}
189
190			/* More detailed messages (information that does not need to go to the log). */
191
192			void
193			verbose(const char *fmt,...)
194			{
195			va_list args;
196
197			va_start(args, fmt);
198			do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
199			va_end(args);
200			}
201
202			/* Debugging messages that should not be logged during normal operation. */
203
204			void
205			debug(const char *fmt,...)
206			{
207		57488	va_list args;
208
209		28744	va_start(args, fmt);
210		28744	do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
211		28744	va_end(args);
212		28744	}
213
214			void
215			debug2(const char *fmt,...)
216			{
217		28744	va_list args;
218
219		14372	va_start(args, fmt);
220		14372	do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
221		14372	va_end(args);
222		14372	}
223
224			void
225			debug3(const char *fmt,...)
226			{
227			va_list args;
228
229			va_start(args, fmt);
230			do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
231			va_end(args);
232			}
233
234			/*
235			* Initialize the log.
236			*/
237
238			void
239			log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
240			{
241			argv0 = av0;
242
243			if (log_change_level(level) != 0) {
244			fprintf(stderr, "Unrecognized internal syslog level code %d\n",
245			(int) level);
246			exit(1);
247			}
248
249			log_handler = NULL;
250			log_handler_ctx = NULL;
251
252			log_on_stderr = on_stderr;
253			if (on_stderr)
254			return;
255
256			switch (facility) {
257			case SYSLOG_FACILITY_DAEMON:
258			log_facility = LOG_DAEMON;
259			break;
260			case SYSLOG_FACILITY_USER:
261			log_facility = LOG_USER;
262			break;
263			case SYSLOG_FACILITY_AUTH:
264			log_facility = LOG_AUTH;
265			break;
266			case SYSLOG_FACILITY_LOCAL0:
267			log_facility = LOG_LOCAL0;
268			break;
269			case SYSLOG_FACILITY_LOCAL1:
270			log_facility = LOG_LOCAL1;
271			break;
272			case SYSLOG_FACILITY_LOCAL2:
273			log_facility = LOG_LOCAL2;
274			break;
275			case SYSLOG_FACILITY_LOCAL3:
276			log_facility = LOG_LOCAL3;
277			break;
278			case SYSLOG_FACILITY_LOCAL4:
279			log_facility = LOG_LOCAL4;
280			break;
281			case SYSLOG_FACILITY_LOCAL5:
282			log_facility = LOG_LOCAL5;
283			break;
284			case SYSLOG_FACILITY_LOCAL6:
285			log_facility = LOG_LOCAL6;
286			break;
287			case SYSLOG_FACILITY_LOCAL7:
288			log_facility = LOG_LOCAL7;
289			break;
290			default:
291			fprintf(stderr,
292			"Unrecognized internal syslog facility code %d\n",
293			(int) facility);
294			exit(1);
295			}
296			}
297
298			int
299			log_change_level(LogLevel new_log_level)
300			{
301			/* no-op if log_init has not been called */
302			if (argv0 == NULL)
303			return 0;
304
305			switch (new_log_level) {
306			case SYSLOG_LEVEL_QUIET:
307			case SYSLOG_LEVEL_FATAL:
308			case SYSLOG_LEVEL_ERROR:
309			case SYSLOG_LEVEL_INFO:
310			case SYSLOG_LEVEL_VERBOSE:
311			case SYSLOG_LEVEL_DEBUG1:
312			case SYSLOG_LEVEL_DEBUG2:
313			case SYSLOG_LEVEL_DEBUG3:
314			log_level = new_log_level;
315			return 0;
316			default:
317			return -1;
318			}
319			}
320
321			int
322			log_is_on_stderr(void)
323			{
324			return log_on_stderr && log_stderr_fd == STDERR_FILENO;
325			}
326
327			/* redirect what would usually get written to stderr to specified file */
328			void
329			log_redirect_stderr_to(const char *logfile)
330			{
331			int fd;
332
333			if ((fd = open(logfile, O_WRONLY\|O_CREAT\|O_APPEND, 0600)) == -1) {
334			fprintf(stderr, "Couldn't open logfile %s: %s\n", logfile,
335			strerror(errno));
336			exit(1);
337			}
338			log_stderr_fd = fd;
339			}
340
341			#define MSGBUFSIZ 1024
342
343			void
344			set_log_handler(log_handler_fn handler, void ctx)
345			{
346			log_handler = handler;
347			log_handler_ctx = ctx;
348			}
349
350			void
351			do_log2(LogLevel level, const char *fmt,...)
352			{
353			va_list args;
354
355			va_start(args, fmt);
356			do_log(level, fmt, args);
357			va_end(args);
358			}
359
360			void
361			do_log(LogLevel level, const char *fmt, va_list args)
362			{
363		86232	struct syslog_data sdata = SYSLOG_DATA_INIT;
364		43116	char msgbuf[MSGBUFSIZ];
365		43116	char fmtbuf[MSGBUFSIZ];
366			char *txt = NULL;
367			int pri = LOG_INFO;
368		43116	int saved_errno = errno;
369			log_handler_fn *tmp_handler;
370
371	✓✗	43116	if (level > log_level)
372		43116	return;
373
374			switch (level) {
375			case SYSLOG_LEVEL_FATAL:
376			if (!log_on_stderr)
377			txt = "fatal";
378			pri = LOG_CRIT;
379			break;
380			case SYSLOG_LEVEL_ERROR:
381			if (!log_on_stderr)
382			txt = "error";
383			pri = LOG_ERR;
384			break;
385			case SYSLOG_LEVEL_INFO:
386			pri = LOG_INFO;
387			break;
388			case SYSLOG_LEVEL_VERBOSE:
389			pri = LOG_INFO;
390			break;
391			case SYSLOG_LEVEL_DEBUG1:
392			txt = "debug1";
393			pri = LOG_DEBUG;
394			break;
395			case SYSLOG_LEVEL_DEBUG2:
396			txt = "debug2";
397			pri = LOG_DEBUG;
398			break;
399			case SYSLOG_LEVEL_DEBUG3:
400			txt = "debug3";
401			pri = LOG_DEBUG;
402			break;
403			default:
404			txt = "internal error";
405			pri = LOG_ERR;
406			break;
407			}
408			if (txt != NULL && log_handler == NULL) {
409			snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
410			vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
411			} else {
412			vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
413			}
414			strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE\|VIS_OCTAL);
415			if (log_handler != NULL) {
416			/* Avoid recursion */
417			tmp_handler = log_handler;
418			log_handler = NULL;
419			tmp_handler(level, fmtbuf, log_handler_ctx);
420			log_handler = tmp_handler;
421			} else if (log_on_stderr) {
422			snprintf(msgbuf, sizeof msgbuf, "%.*s\r\n",
423			(int)sizeof msgbuf - 3, fmtbuf);
424			(void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
425			} else {
426			openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
427			syslog_r(pri, &sdata, "%.500s", fmtbuf);
428			closelog_r(&sdata);
429			}
430			errno = saved_errno;
431		43116	}