#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)syslog.c 8.8 (Berkeley) 8/30/95";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <syslog.h>
#include <netdb.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef BSD4_4
# include <paths.h>
#else
# ifndef _PATH_CONSOLE
# define _PATH_CONSOLE "/dev/console"
# endif
# ifndef _PATH_LOG
# define _PATH_LOG "/dev/log"
# endif
#endif
#ifdef HAVE_STDARG_H
# include <stdarg.h>
#else
# include <varargs.h>
# define const
#endif
#ifndef USESNPRINTF
# if defined(BSD4_4)
# define USESNPRINTF 1
# else
# define USESNPRINTF 0
# endif
#endif
#ifndef LOG_PRI
# define LOG_PRI(p) ((p) & LOG_PRIMASK)
#endif
#ifndef LOG_PERROR
# define LOG_PERROR 0
#endif
#define BUFSLOP 1024
static int LogFile = -1;
static int connected;
static int LogStat = 0;
static const char *LogTag = NULL;
static int LogFacility = LOG_USER;
static int LogMask = 0xff;
#if defined(BSD4_4)
extern char *__progname;
#else
char *__progname = NULL;
#endif
void
#if __STDC__
syslog(int pri, const char *fmt, ...)
#else
syslog(pri, fmt, va_alist)
int pri;
char *fmt;
va_dcl
#endif
{
va_list ap;
extern void vsyslog();
#if __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;
int panic = 0;
static int maxsend = BUFSIZ;
char *stdp, fmt_cpy[1024], tbuf[BUFSIZ + BUFSLOP];
extern void openlog();
#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
syslog(INTERNALLOG,
"syslog: unknown facility/priority: %x", pri);
pri &= LOG_PRIMASK|LOG_FACMASK;
}
if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
return;
saved_errno = errno;
if ((pri & LOG_FACMASK) == 0)
pri |= LogFacility;
if (!connected)
openlog(LogTag, LogStat | LOG_NDELAY, 0);
(void)time(&now);
sprintf(tbuf, "<%d>", pri);
p = tbuf + strlen(tbuf);
strftime(p, sizeof (tbuf) - (p - tbuf), "%h %d %T ", localtime(&now));
p += strlen(p);
stdp = p;
if (LogTag == NULL)
LogTag = __progname;
if (LogTag != NULL) {
sprintf(p, "%s", LogTag);
p += strlen(p);
}
if (LogStat & LOG_PID) {
sprintf(p, "[%d]", getpid());
p += strlen(p);
}
if (LogTag != NULL) {
*p++ = ':';
*p++ = ' ';
}
for (t = fmt_cpy; ch = *fmt; ++fmt)
if (ch == '%' && fmt[1] == 'm') {
++fmt;
sprintf(t, "%s", strerror(saved_errno));
t += strlen(t);
} else
*t++ = ch;
*t = '\0';
#if USESNPRINTF
cnt = maxsend - (p - tbuf) + 1;
p += vsnprintf(p, cnt, fmt_cpy, ap);
cnt = p - tbuf;
#else
vsprintf(p, fmt_cpy, ap);
p += strlen(p);
cnt = p - tbuf;
if (cnt > sizeof tbuf) {
panic = 1;
}
if (cnt > maxsend)
cnt = maxsend;
#endif
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);
}
for (;;) {
if (send(LogFile, tbuf, cnt, 0) >= 0)
goto done;
if (errno != EMSGSIZE || maxsend <= 256)
break;
do {
maxsend -= 128;
} while (cnt < maxsend && maxsend > 256);
cnt = maxsend;
}
if (LogStat & LOG_CONS &&
(fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
(void)strcat(tbuf, "\r\n");
cnt += 2;
p = strchr(tbuf, '>') + 1;
(void)write(fd, p, cnt - (p - tbuf));
(void)close(fd);
}
done:
#if !USESNPRINTF
if (panic) {
syslog(LOG_EMERG, "SYSLOG BUFFER OVERRUN -- EXITING");
abort();
}
#endif
}
static struct sockaddr SyslogAddr;
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;
(void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
sizeof(SyslogAddr.sa_data));
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, &SyslogAddr, sizeof(SyslogAddr)) == -1) {
(void)close(LogFile);
LogFile = -1;
} else
connected = 1;
}
void
closelog()
{
(void)close(LogFile);
LogFile = -1;
connected = 0;
}
int
setlogmask(pmask)
int pmask;
{
int omask;
omask = LogMask;
if (pmask != 0)
LogMask = pmask;
return (omask);
}