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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 this notice is preserved and that due credit is given
* to the University of California at 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'' without express or implied warranty.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c 5.14 (Berkeley) 5/20/88";
#endif /* LIBC_SCCS and not lint */
/*
* 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 /etc/syslogd.
*
* Author: Eric Allman
* Modified to use UNIX domain IPC by Ralph Campbell
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <syslog.h>
#include <netdb.h>
#include <string.h>
#define MAXLINE 1024 /* max message size */
#define NULL 0 /* manifest */
#define PRIFAC(p) (((p) & LOG_FACMASK) >> 3)
/* XXX should be in <syslog.h> */
#define IMPORTANT LOG_ERR
static char logname[] = "/dev/log";
static char ctty[] = "/dev/console";
static int LogFile = -1; /* fd for log */
static int LogStat = 0; /* status bits, set by openlog() */
static char *LogTag = "syslog"; /* string to tag the entry with */
static int LogMask = 0xff; /* mask of priorities to be logged */
static int LogFacility = LOG_USER; /* default facility code */
static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
extern int errno, sys_nerr;
extern char *sys_errlist[];
syslog(pri, fmt, p0, p1, p2, p3, p4)
int pri;
char *fmt;
{
char buf[MAXLINE + 1], outline[MAXLINE + 1];
register char *b, *f, *o;
register int c;
long now;
int pid, olderrno = errno;
/* see if we should just throw out this message */
if ((unsigned) PRIFAC(pri) >= LOG_NFACILITIES ||
(LOG_MASK(pri & LOG_PRIMASK) & LogMask) == 0 ||
(pri &~ (LOG_PRIMASK|LOG_FACMASK)) != 0)
return;
if (LogFile < 0)
openlog(LogTag, LogStat | LOG_NDELAY, 0);
/* set default facility if none specified */
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
/* build the message */
o = outline;
(void)sprintf(o, "<%d>", pri);
o += strlen(o);
time(&now);
(void)sprintf(o, "%.15s ", ctime(&now) + 4);
o += strlen(o);
if (LogTag) {
strcpy(o, LogTag);
o += strlen(o);
}
if (LogStat & LOG_PID) {
(void)sprintf(o, "[%d]", getpid());
o += strlen(o);
}
if (LogTag) {
strcpy(o, ": ");
o += 2;
}
b = buf;
f = fmt;
while ((c = *f++) != '\0' && c != '\n' && b < &buf[MAXLINE]) {
if (c != '%') {
*b++ = c;
continue;
}
if ((c = *f++) != 'm') {
*b++ = '%';
*b++ = c;
continue;
}
if ((unsigned)olderrno > sys_nerr)
(void)sprintf(b, "error %d", olderrno);
else
strcpy(b, sys_errlist[olderrno]);
b += strlen(b);
}
*b++ = '\n';
*b = '\0';
(void)sprintf(o, buf, p0, p1, p2, p3, p4);
c = strlen(outline);
if (c > MAXLINE)
c = MAXLINE;
/* output the message to the local logger */
if (sendto(LogFile, outline, c, 0, &SyslogAddr, sizeof SyslogAddr) >= 0)
return;
if (!(LogStat & LOG_CONS))
return;
/* output the message to the console */
pid = vfork();
if (pid == -1)
return;
if (pid == 0) {
int fd;
signal(SIGALRM, SIG_DFL);
sigsetmask(sigblock(0L) & ~sigmask(SIGALRM));
alarm(5);
fd = open(ctty, O_WRONLY);
alarm(0);
strcat(o, "\r");
o = index(outline, '>') + 1;
write(fd, o, c + 1 - (o - outline));
close(fd);
_exit(0);
}
if (!(LogStat & LOG_NOWAIT))
while ((c = wait((int *)0)) > 0 && c != pid)
;
}
/*
* OPENLOG -- open system log
*/
openlog(ident, logstat, logfac)
char *ident;
int logstat, logfac;
{
if (ident != NULL)
LogTag = ident;
LogStat = logstat;
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
LogFacility = logfac;
if (LogFile >= 0)
return;
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);
}
}
/*
* CLOSELOG -- close the system log
*/
closelog()
{
(void) close(LogFile);
LogFile = -1;
}
/*
* SETLOGMASK -- set the log mask level
*/
setlogmask(pmask)
int pmask;
{
int omask;
omask = LogMask;
if (pmask != 0)
LogMask = pmask;
return (omask);
}
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