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/*
* Copyright (c) 1983, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* based on @(#)syslog.c 5.20 (Berkeley) 1/19/89 */
/*
* SYSLOG -- print message on log file
*
* This routine looks a lot like printf, except that it outputs to the
* log file instead of the standard output. Also:
* adds a timestamp,
* prints the module name in front of the message,
* has some other formatting types (or will sometime),
* adds a newline on the end of the message.
*
* The output of this routine is intended to be read by syslogd(8).
*
* Author: Eric Allman
* Modified to use UNIX domain IPC by Ralph Campbell
*/
#ifndef _WINDOWS
#if defined(__STDC__) || defined(_WINDOWS)
#include <stdarg.h>
#else
#define const
#include <varargs.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/syslog.h>
#include <sys/wait.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#define LOGNAME "/dev/log"
#define CONSOLE "/dev/console"
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 */
void
#if defined(__STDC__) || defined(_WINDOWS)
syslog(int pri, const char *fmt, ...)
#else
syslog(pri, fmt, va_alist)
int pri;
char *fmt;
va_dcl
#endif
{
va_list pvar;
void vsyslog();
#if defined(__STDC__) || defined(_WINDOWS)
va_start(pvar, fmt);
#else
va_start(pvar);
#endif
vsyslog(pri, fmt, pvar);
va_end(pvar);
}
void
vsyslog(pri, fmt, ap)
int pri;
const register char *fmt;
va_list ap;
{
extern int errno;
register int cnt;
register char *p;
time_t now, time();
int pid, saved_errno;
char tbuf[2048], fmt_cpy[1024], *ctime();
void openlog();
saved_errno = errno;
/* see if we should just throw out this message */
if ((u_int)LOG_FAC(pri) >= LOG_NFACILITIES ||
!LOG_MASK(LOG_PRI(pri)) || (pri &~ (LOG_PRIMASK|LOG_FACMASK)))
return;
if (LogFile < 0 || !connected)
openlog(LogTag, LogStat | LOG_NDELAY, 0);
/* set default facility if none specified */
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
/* build the message */
(void)time(&now);
(void)sprintf(tbuf, "<%d>%.15s ", pri, ctime(&now) + 4);
for (p = tbuf; *p; ++p);
if (LogTag) {
(void)strcpy(p, LogTag);
for (; *p; ++p);
}
if (LogStat & LOG_PID) {
(void)sprintf(p, "[%d]", getpid());
for (; *p; ++p);
}
if (LogTag) {
*p++ = ':';
*p++ = ' ';
}
/* substitute error message for %m */
{
register char ch, *t1, *t2;
#ifndef strerror
extern char *strerror();
#endif
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)vsprintf(p, fmt_cpy, ap);
/* output the message to the local logger */
if (send(LogFile, tbuf, cnt = strlen(tbuf), 0) >= 0 ||
!(LogStat&LOG_CONS))
return;
/* output the message to the console */
#if defined(SYSV) || defined(_AIX)
pid = fork();
#else
pid = vfork();
#endif
if (pid == -1)
return;
if (pid == 0) {
int fd;
(void)signal(SIGALRM, SIG_DFL);
sigsetmask((long)~sigmask(SIGALRM));
(void)alarm((u_int)5);
if ((fd = open(CONSOLE, O_WRONLY, 0)) < 0)
return;
(void)alarm((u_int)0);
(void)strcat(tbuf, "\r");
p = strchr(tbuf, '>') + 1;
(void)write(fd, p, cnt + 1 - (p - tbuf));
(void)close(fd);
_exit(0);
}
#if defined(SYSV) || defined(_AIX) || defined(_POSIX_SOURCE)
#define cast int *
#else
#define cast union wait *
#endif
if (!(LogStat & LOG_NOWAIT))
while ((cnt = wait((cast)0)) > 0 && cnt != pid);
#undef cast
}
static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
/*
* OPENLOG -- open system log
*/
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.sa_family = AF_UNIX;
strncpy(SyslogAddr.sa_data, LOGNAME, sizeof SyslogAddr.sa_data);
if (LogStat & LOG_NDELAY) {
LogFile = socket(AF_UNIX, SOCK_DGRAM, 0);
fcntl(LogFile, F_SETFD, 1);
}
}
if (LogFile != -1 && !connected &&
connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) != -1)
connected = 1;
}
/*
* CLOSELOG -- close the system log
*/
void
closelog()
{
(void) close(LogFile);
LogFile = -1;
connected = 0;
}
static int LogMask = 0xff; /* mask of priorities to be logged */
/*
* SETLOGMASK -- set the log mask level
*/
int
setlogmask(pmask)
int pmask;
{
int omask;
omask = LogMask;
if (pmask != 0)
LogMask = pmask;
return (omask);
}
#else /* _MSDOS */
/* Windows doesn't have the concept of a system log, so just
** do nothing here.
*/
void
syslog(int pri, const char *fmt, ...)
{
return;
}
#endif
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