[apple/libc.git] / gen / syslog.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1993
 *	The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/socket.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <netdb.h>

#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include <crt_externs.h>
 
static int	LogFile = -1;		/* fd for log */
static int	connected;		/* have done connect */
static int	LogStat = 0;		/* status bits, set by openlog() */
static const char *LogTag = NULL;	/* string to tag the entry with */
static int	LogFacility = LOG_USER;	/* default facility code */
static int	LogMask = 0xff;		/* mask of priorities to be logged */

/*
 * syslog, vsyslog --
 *	print message on log file; output is intended for syslogd(8).
 */
void
#ifdef __STDC__
syslog(int pri, const char *fmt, ...)
#else
syslog(pri, fmt, va_alist)
	int pri;
	char *fmt;
	va_dcl
#endif
{
	va_list ap;

#ifdef __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	vsyslog(pri, fmt, ap);
	va_end(ap);
}

void
vsyslog(pri, fmt, ap)
	int pri;
	register const char *fmt;
	va_list ap;
{
	register int cnt;
	register char ch, *p, *t;
	time_t now;
	int fd, saved_errno;
#define	TBUF_LEN	2048
#define	FMT_LEN		1024
	char *stdp, tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
	int tbuf_left, fmt_left, prlen;

#define	INTERNALLOG	LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
	/* Check for invalid bits. */
	if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
		syslog(INTERNALLOG,
		    "syslog: unknown facility/priority: %x", pri);
		pri &= LOG_PRIMASK|LOG_FACMASK;
	}

	/* Check priority against setlogmask values. */
	if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
		return;

	saved_errno = errno;

	/* Set default facility if none specified. */
	if ((pri & LOG_FACMASK) == 0)
		pri |= LogFacility;

	/* Build the message. */
	
	/*
 	 * Although it's tempting, we can't ignore the possibility of
	 * overflowing the buffer when assembling the "fixed" portion
	 * of the message.  Strftime's "%h" directive expands to the
	 * locale's abbreviated month name, but if the user has the
	 * ability to construct to his own locale files, it may be
	 * arbitrarily long.
	 */
	(void)time(&now);

	p = tbuf;  
	tbuf_left = TBUF_LEN;
	
#define	DEC()	\
	do {					\
		if (prlen >= tbuf_left)		\
			prlen = tbuf_left - 1;	\
		p += prlen;			\
		tbuf_left -= prlen;		\
	} while (0)

	prlen = snprintf(p, tbuf_left, "<%d>", pri);
	DEC();

	prlen = strftime(p, tbuf_left, "%h %e %T ", localtime(&now));
	DEC();

	if (LogStat & LOG_PERROR)
		stdp = p;
	if (LogTag == NULL)
		LogTag = *(*_NSGetArgv());
	if (LogTag != NULL) {
		prlen = snprintf(p, tbuf_left, "%s", LogTag);
		DEC();
	}
	if (LogStat & LOG_PID) {
		prlen = snprintf(p, tbuf_left, "[%d]", getpid());
		DEC();
	}
	if (LogTag != NULL) {
		if (tbuf_left > 1) {
			*p++ = ':';
			tbuf_left--;
		}
		if (tbuf_left > 1) {
			*p++ = ' ';
			tbuf_left--;
		}
	}

	/* 
	 * We wouldn't need this mess if printf handled %m, or if 
	 * strerror() had been invented before syslog().
	 */
	for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt); ++fmt) {
		if (ch == '%' && fmt[1] == 'm') {
			++fmt;
			prlen = snprintf(t, fmt_left, "%s",
			    strerror(saved_errno));
			if (prlen >= fmt_left)
				prlen = fmt_left - 1;
			t += prlen;
			fmt_left -= prlen;
		} else {
			if (fmt_left > 1) {
				*t++ = ch;
				fmt_left--;
			}
		}
	}
	*t = '\0';

	prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
	DEC();
	cnt = p - tbuf;

	/* Output to stderr if requested. */
	if (LogStat & LOG_PERROR) {
		struct iovec iov[2];

		iov[0].iov_base = stdp;
		iov[0].iov_len = cnt - (stdp - tbuf);
		iov[1].iov_base = "\n";
		iov[1].iov_len = 1;
		(void)writev(STDERR_FILENO, iov, 2);
	}

	/* Get connected, output the message to the local logger. */
	if (!connected)
		openlog(LogTag, LogStat | LOG_NDELAY, 0);
	if (send(LogFile, tbuf, cnt, 0) >= 0)
		return;

	/*
	 * Output the message to the console; don't worry about blocking,
	 * if console blocks everything will.  Make sure the error reported
	 * is the one from the syslogd failure.
	 */
	if (LogStat & LOG_CONS &&
	    (fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
		struct iovec iov[2];
		
		p = strchr(tbuf, '>') + 1;
		iov[0].iov_base = p;
		iov[0].iov_len = cnt - (p - tbuf);
		iov[1].iov_base = "\r\n";
		iov[1].iov_len = 2;
		(void)writev(fd, iov, 2);
		(void)close(fd);
	}
}

static struct sockaddr_un SyslogAddr;	/* AF_UNIX address of local logger */

void
openlog(ident, logstat, logfac)
	const char *ident;
	int logstat, logfac;
{
	if (ident != NULL)
		LogTag = ident;
	LogStat = logstat;
	if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
		LogFacility = logfac;

	if (LogFile == -1) {
		SyslogAddr.sun_family = AF_UNIX;
		(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
		    sizeof(SyslogAddr.sun_path));
		if (LogStat & LOG_NDELAY) {
			if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
				return;
			(void)fcntl(LogFile, F_SETFD, 1);
		}
	}
	if (LogFile != -1 && !connected)
		if (connect(LogFile, (struct sockaddr *)&SyslogAddr, sizeof(SyslogAddr)) == -1) {
			(void)close(LogFile);
			LogFile = -1;
		} else
			connected = 1;
}

void
closelog()
{
	(void)close(LogFile);
	LogFile = -1;
	connected = 0;
}

/* setlogmask -- set the log mask level */
int
setlogmask(pmask)
	int pmask;
{
	int omask;

	omask = LogMask;
	if (pmask != 0)
		LogMask = pmask;
	return (omask);
}
Commit	Line	Data
e9ce8d39 A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
734aad71 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
e9ce8d39 A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
e9ce8d39 A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
734aad71 A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
e9ce8d39 A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/*
	24	* Copyright (c) 1993
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* Redistribution and use in source and binary forms, with or without
	28	* modification, are permitted provided that the following conditions
	29	* are met:
	30	* 1. Redistributions of source code must retain the above copyright
	31	* notice, this list of conditions and the following disclaimer.
	32	* 2. Redistributions in binary form must reproduce the above copyright
	33	* notice, this list of conditions and the following disclaimer in the
	34	* documentation and/or other materials provided with the distribution.
	35	* 3. All advertising materials mentioning features or use of this software
	36	* must display the following acknowledgement:
	37	* This product includes software developed by the University of
	38	* California, Berkeley and its contributors.
	39	* 4. Neither the name of the University nor the names of its contributors
	40	* may be used to endorse or promote products derived from this software
	41	* without specific prior written permission.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	44	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	45	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	46	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	47	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	48	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	49	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	50	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	51	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	52	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	53	* SUCH DAMAGE.
	54	*/
	55
	56	#include <sys/types.h>
	57	#include <sys/socket.h>
	58	#include <sys/syslog.h>
	59	#include <sys/uio.h>
	60	#include <sys/un.h>
	61	#include <netdb.h>
	62
	63	#include <errno.h>
	64	#include <fcntl.h>
	65	#include <paths.h>
	66	#include <stdio.h>
	67	#include <string.h>
	68	#include <time.h>
	69	#include <unistd.h>
	70
	71	#ifdef __STDC__
	72	#include <stdarg.h>
	73	#else
	74	#include <varargs.h>
	75	#endif
	76
	77	#include <crt_externs.h>
	78
	79	static int LogFile = -1; /* fd for log */
	80	static int connected; /* have done connect */
	81	static int LogStat = 0; /* status bits, set by openlog() */
	82	static const char LogTag = NULL; / string to tag the entry with */
	83	static int LogFacility = LOG_USER; /* default facility code */
84	static int LogMask = 0xff; /* mask of priorities to be logged */
85
86	/*
87	* syslog, vsyslog --
88	* print message on log file; output is intended for syslogd(8).
89	*/
90	void
91	#ifdef __STDC__
92	syslog(int pri, const char *fmt, ...)
93	#else
94	syslog(pri, fmt, va_alist)
95	int pri;
96	char *fmt;
97	va_dcl
98	#endif
99	{
100	va_list ap;
101
102	#ifdef __STDC__
103	va_start(ap, fmt);
104	#else
105	va_start(ap);
106	#endif
107	vsyslog(pri, fmt, ap);
108	va_end(ap);
109	}
110
111	void
112	vsyslog(pri, fmt, ap)
113	int pri;
114	register const char *fmt;
115	va_list ap;
116	{
117	register int cnt;
118	register char ch, p, t;
119	time_t now;
120	int fd, saved_errno;
121	#define TBUF_LEN 2048
122	#define FMT_LEN 1024
123	char *stdp, tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
124	int tbuf_left, fmt_left, prlen;
125
126	#define INTERNALLOG LOG_ERR\|LOG_CONS\|LOG_PERROR\|LOG_PID
127	/* Check for invalid bits. */
128	if (pri & ~(LOG_PRIMASK\|LOG_FACMASK)) {
129	syslog(INTERNALLOG,
130	"syslog: unknown facility/priority: %x", pri);
131	pri &= LOG_PRIMASK\|LOG_FACMASK;
132	}
133
134	/* Check priority against setlogmask values. */
135	if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
136	return;
137
138	saved_errno = errno;
139
140	/* Set default facility if none specified. */
141	if ((pri & LOG_FACMASK) == 0)
142	pri \|= LogFacility;
143
144	/* Build the message. */
145
146	/*
147	* Although it's tempting, we can't ignore the possibility of
148	* overflowing the buffer when assembling the "fixed" portion
149	* of the message. Strftime's "%h" directive expands to the
150	* locale's abbreviated month name, but if the user has the
151	* ability to construct to his own locale files, it may be
152	* arbitrarily long.
153	*/
154	(void)time(&now);
155
156	p = tbuf;
157	tbuf_left = TBUF_LEN;
158
159	#define DEC() \
160	do { \
161	if (prlen >= tbuf_left) \
162	prlen = tbuf_left - 1; \
163	p += prlen; \
164	tbuf_left -= prlen; \
165	} while (0)
166
167	prlen = snprintf(p, tbuf_left, "<%d>", pri);
168	DEC();
169
170	prlen = strftime(p, tbuf_left, "%h %e %T ", localtime(&now));
171	DEC();
172
173	if (LogStat & LOG_PERROR)
174	stdp = p;
175	if (LogTag == NULL)
176	LogTag = (_NSGetArgv());
177	if (LogTag != NULL) {
178	prlen = snprintf(p, tbuf_left, "%s", LogTag);
179	DEC();
180	}
181	if (LogStat & LOG_PID) {
182	prlen = snprintf(p, tbuf_left, "[%d]", getpid());
183	DEC();
184	}
185	if (LogTag != NULL) {
186	if (tbuf_left > 1) {
187	*p++ = ':';
188	tbuf_left--;
189	}
190	if (tbuf_left > 1) {
191	*p++ = ' ';
192	tbuf_left--;
193	}
194	}
195
196	/*
197	* We wouldn't need this mess if printf handled %m, or if
198	* strerror() had been invented before syslog().
199	*/
200	for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt); ++fmt) {
201	if (ch == '%' && fmt[1] == 'm') {
202	++fmt;
203	prlen = snprintf(t, fmt_left, "%s",
204	strerror(saved_errno));
205	if (prlen >= fmt_left)
206	prlen = fmt_left - 1;
207	t += prlen;
208	fmt_left -= prlen;
209	} else {
210	if (fmt_left > 1) {
211	*t++ = ch;
212	fmt_left--;
213	}
214	}
215	}
216	*t = '\0';
217
218	prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
219	DEC();
220	cnt = p - tbuf;
221
222	/* Output to stderr if requested. */
223	if (LogStat & LOG_PERROR) {
224	struct iovec iov[2];
225
226	iov[0].iov_base = stdp;
227	iov[0].iov_len = cnt - (stdp - tbuf);
228	iov[1].iov_base = "\n";
229	iov[1].iov_len = 1;
230	(void)writev(STDERR_FILENO, iov, 2);
231	}
232
233	/* Get connected, output the message to the local logger. */
234	if (!connected)
235	openlog(LogTag, LogStat \| LOG_NDELAY, 0);
236	if (send(LogFile, tbuf, cnt, 0) >= 0)
237	return;
238
239	/*
240	* Output the message to the console; don't worry about blocking,
241	* if console blocks everything will. Make sure the error reported
242	* is the one from the syslogd failure.
243	*/
244	if (LogStat & LOG_CONS &&
245	(fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
246	struct iovec iov[2];
247
248	p = strchr(tbuf, '>') + 1;
249	iov[0].iov_base = p;
250	iov[0].iov_len = cnt - (p - tbuf);
251	iov[1].iov_base = "\r\n";
252	iov[1].iov_len = 2;
253	(void)writev(fd, iov, 2);
254	(void)close(fd);
255	}
256	}
257
258	static struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
259
260	void
261	openlog(ident, logstat, logfac)
262	const char *ident;
263	int logstat, logfac;
264	{
265	if (ident != NULL)
266	LogTag = ident;
267	LogStat = logstat;
268	if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
269	LogFacility = logfac;
270
271	if (LogFile == -1) {
272	SyslogAddr.sun_family = AF_UNIX;
273	(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
274	sizeof(SyslogAddr.sun_path));
275	if (LogStat & LOG_NDELAY) {
276	if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
277	return;
278	(void)fcntl(LogFile, F_SETFD, 1);
279	}
280	}
281	if (LogFile != -1 && !connected)
9385eb3d	282	if (connect(LogFile, (struct sockaddr *)&SyslogAddr, sizeof(SyslogAddr)) == -1) {
e9ce8d39 A	283	(void)close(LogFile);
	284	LogFile = -1;
	285	} else
	286	connected = 1;
	287	}
	288
	289	void
	290	closelog()
	291	{
	292	(void)close(LogFile);
	293	LogFile = -1;
	294	connected = 0;
	295	}
	296
	297	/* setlogmask -- set the log mask level */
	298	int
	299	setlogmask(pmask)
	300	int pmask;
	301	{
	302	int omask;
	303
	304	omask = LogMask;
	305	if (pmask != 0)
	306	LogMask = pmask;
	307	return (omask);
	308	}