File: syslog.c

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#include "port.h"
/*
 * Copyright (c) 1983, 1988 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c	5.34 (Berkeley) 6/26/91";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/file.h>
#include <syslog.h>
#include <sys/uio.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>

#ifndef _PATH_LOG
#define _PATH_LOG "/dev/log"
#endif
#ifndef _PATH_CONSOLE
#define	_PATH_CONSOLE "/dev/console"
#endif
#define PORT_SYSLOG	514		/* default port */

char*     index(const char*, int);

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 = "syslog";	/* 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
syslog(int pri, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vsyslog(pri, fmt, ap);
	va_end(ap);
}

void
vsyslog(int pri, register const char* fmt, va_list ap)
{
	register int cnt;
	register char *p;
	time_t now, time();
	int fd, saved_errno;
	char tbuf[2048], fmt_cpy[1024], *stdp, *ctime();

	/* check for invalid bits or no priority set */
	if (!LOG_PRI(pri) || (pri &~ (LOG_PRIMASK|LOG_FACMASK)) ||
	    !(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 */
	(void)time(&now);
	(void)snprintf(tbuf, sizeof(tbuf), "<%d>%.15s ", pri, ctime(&now) + 4);
	for (p = tbuf; *p; ++p);
	if (LogStat & LOG_PERROR)
		stdp = p;
	if (LogTag) {
		(void)strcpy(p, LogTag);
		for (; *p; ++p);
	}
	if (LogStat & LOG_PID) {
		(void)snprintf(p, tbuf + sizeof(tbuf) - p, "[%d]", getpid());
		for (; *p; ++p);
	}
	if (LogTag) {
		*p++ = ':';
		*p++ = ' ';
	}

	/* substitute error message for %m */
	{
		register char ch, *t1, *t2;
		char *strerror();

		for (t1 = fmt_cpy; ch = *fmt; ++fmt)
			if (ch == '%' && fmt[1] == 'm') {
				++fmt;
				for (t2 = strerror(saved_errno);
				    *t1 = *t2++; ++t1);
			}
			else
				*t1++ = ch;
		*t1 = '\0';
	}

	(void)vsnprintf(p, tbuf + sizeof(tbuf) - p, fmt_cpy, ap);

	cnt = strlen(tbuf);

	/* output to stderr if requested */
	if (LogStat & LOG_PERROR) {
		struct iovec iov[2];
		register struct iovec *v = iov;

		v->iov_base = stdp;
		v->iov_len = cnt - (stdp - tbuf);
		++v;
		v->iov_base = "\n";
		v->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;

	/* see if should attempt the console */
	if (!(LogStat&LOG_CONS))
		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 ((fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
		(void)strcat(tbuf, "\r\n");
		cnt += 2;
		p = index(tbuf, '>') + 1;
		(void)write(fd, p, cnt - (p - tbuf));
		(void)close(fd);
	}
}

static struct sockaddr SyslogAddr;	/* address of local logger */

void
openlog(const char* ident, int logstat, int logfac)
{

	if (ident != NULL)
		LogTag = ident;
	LogStat = logstat;
	if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
		LogFacility = logfac;

	if (LogFile == -1) {
		if (LogStat & LOG_NDELAY) {
#ifdef AF_UNIX
			if (LogFile == -1) {
				SyslogAddr.sa_family = AF_UNIX;
				(void) strncpy(SyslogAddr.sa_data, _PATH_LOG,
				    sizeof(SyslogAddr.sa_data));
				LogFile = socket(AF_UNIX, SOCK_DGRAM, 0);
			}
#endif
#ifdef AF_INET
			if (LogFile == -1) {
				struct servent* sp =
				    getservbyname("syslog", "udp");
				struct sockaddr_in* sin =
				    (struct sockaddr_in*) &SyslogAddr;

				sin->sin_family = AF_INET;
				if (sp)
					sin->sin_port = sp->s_port;
				else
					sin->sin_port = htons(PORT_SYSLOG);
				sin->sin_addr.s_addr = htonl(INADDR_ANY);
				LogFile = socket(AF_INET, SOCK_DGRAM, 0);
			}
#endif
			if (LogFile == -1)
				return;
			(void) fcntl(LogFile, F_SETFD, 1);
		}
	}
	if (LogFile != -1 && !connected)
		if (connect(LogFile, &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(int pmask)
{
	int omask;

	omask = LogMask;
	if (pmask != 0)
		LogMask = pmask;
	return (omask);
}