366 lines
8.9 KiB
C
366 lines
8.9 KiB
C
/*
|
|
* Copyright (c) 1983, 1988, 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
/*
|
|
static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 4/29/95";
|
|
*/
|
|
static const char rcsid[] =
|
|
"$Id: syslog.c,v 1.16 1998/03/06 03:10:49 brian Exp $";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#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>
|
|
|
|
#if __STDC__
|
|
#include <stdarg.h>
|
|
#else
|
|
#include <varargs.h>
|
|
#endif
|
|
|
|
static int LogFile = -1; /* fd for log */
|
|
static int connected; /* have done connect */
|
|
static int opened; /* have done openlog() */
|
|
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 */
|
|
extern char *__progname; /* Program name, from crt0. */
|
|
|
|
static void disconnectlog __P((void)); /* disconnect from syslogd */
|
|
static void connectlog __P((void)); /* (re)connect to syslogd */
|
|
|
|
/*
|
|
* Format of the magic cookie passed through the stdio hook
|
|
*/
|
|
struct bufcookie {
|
|
char *base; /* start of buffer */
|
|
int left;
|
|
};
|
|
|
|
/*
|
|
* stdio write hook for writing to a static string buffer
|
|
* XXX: Maybe one day, dynamically allocate it so that the line length
|
|
* is `unlimited'.
|
|
*/
|
|
static
|
|
int writehook(cookie, buf, len)
|
|
void *cookie; /* really [struct bufcookie *] */
|
|
char *buf; /* characters to copy */
|
|
int len; /* length to copy */
|
|
{
|
|
struct bufcookie *h; /* private `handle' */
|
|
|
|
h = (struct bufcookie *)cookie;
|
|
if (len > h->left) {
|
|
/* clip in case of wraparound */
|
|
len = h->left;
|
|
}
|
|
if (len > 0) {
|
|
(void)memcpy(h->base, buf, len); /* `write' it. */
|
|
h->base += len;
|
|
h->left -= len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* syslog, vsyslog --
|
|
* print message on log file; output is intended for syslogd(8).
|
|
*/
|
|
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;
|
|
|
|
#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;
|
|
time_t now;
|
|
int fd, saved_errno;
|
|
char *stdp, tbuf[2048], fmt_cpy[1024];
|
|
FILE *fp, *fmt_fp;
|
|
struct bufcookie tbuf_cookie;
|
|
struct bufcookie fmt_cookie;
|
|
|
|
#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;
|
|
|
|
/* Create the primary stdio hook */
|
|
tbuf_cookie.base = tbuf;
|
|
tbuf_cookie.left = sizeof(tbuf);
|
|
fp = fwopen(&tbuf_cookie, writehook);
|
|
if (fp == NULL)
|
|
return;
|
|
|
|
/* Build the message. */
|
|
(void)time(&now);
|
|
(void)fprintf(fp, "<%d>", pri);
|
|
(void)fprintf(fp, "%.15s ", ctime(&now) + 4);
|
|
if (LogStat & LOG_PERROR) {
|
|
/* Transfer to string buffer */
|
|
(void)fflush(fp);
|
|
stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
|
|
}
|
|
if (LogTag == NULL)
|
|
LogTag = __progname;
|
|
if (LogTag != NULL)
|
|
(void)fprintf(fp, "%s", LogTag);
|
|
if (LogStat & LOG_PID)
|
|
(void)fprintf(fp, "[%d]", getpid());
|
|
if (LogTag != NULL) {
|
|
(void)fprintf(fp, ": ");
|
|
}
|
|
|
|
/* Check to see if we can skip expanding the %m */
|
|
if (strstr(fmt, "%m")) {
|
|
|
|
/* Create the second stdio hook */
|
|
fmt_cookie.base = fmt_cpy;
|
|
fmt_cookie.left = sizeof(fmt_cpy) - 1;
|
|
fmt_fp = fwopen(&fmt_cookie, writehook);
|
|
if (fmt_fp == NULL) {
|
|
fclose(fp);
|
|
return;
|
|
}
|
|
|
|
/* Substitute error message for %m. */
|
|
for ( ; (ch = *fmt); ++fmt)
|
|
if (ch == '%' && fmt[1] == 'm') {
|
|
++fmt;
|
|
fputs(strerror(saved_errno), fmt_fp);
|
|
} else
|
|
fputc(ch, fmt_fp);
|
|
|
|
/* Null terminate if room */
|
|
fputc(0, fmt_fp);
|
|
fclose(fmt_fp);
|
|
|
|
/* Guarantee null termination */
|
|
fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
|
|
|
|
fmt = fmt_cpy;
|
|
}
|
|
|
|
(void)vfprintf(fp, fmt, ap);
|
|
(void)fclose(fp);
|
|
|
|
cnt = sizeof(tbuf) - tbuf_cookie.left;
|
|
|
|
/* 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 (!opened)
|
|
openlog(LogTag, LogStat | LOG_NDELAY, 0);
|
|
connectlog();
|
|
if (send(LogFile, tbuf, cnt, 0) >= 0)
|
|
return;
|
|
|
|
/*
|
|
* If the send() failed, the odds are syslogd was restarted.
|
|
* Make one (only) attempt to reconnect to /dev/log.
|
|
*/
|
|
disconnectlog();
|
|
connectlog();
|
|
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];
|
|
register struct iovec *v = iov;
|
|
|
|
p = strchr(tbuf, '>') + 1;
|
|
v->iov_base = p;
|
|
v->iov_len = cnt - (p - tbuf);
|
|
++v;
|
|
v->iov_base = "\r\n";
|
|
v->iov_len = 2;
|
|
(void)writev(fd, iov, 2);
|
|
(void)close(fd);
|
|
}
|
|
}
|
|
static void
|
|
disconnectlog()
|
|
{
|
|
/*
|
|
* If the user closed the FD and opened another in the same slot,
|
|
* that's their problem. They should close it before calling on
|
|
* system services.
|
|
*/
|
|
if (LogFile != -1) {
|
|
close(LogFile);
|
|
LogFile = -1;
|
|
}
|
|
connected = 0; /* retry connect */
|
|
}
|
|
|
|
static void
|
|
connectlog()
|
|
{
|
|
struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
|
|
|
|
if (LogFile == -1) {
|
|
if ((LogFile = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
|
|
return;
|
|
(void)fcntl(LogFile, F_SETFD, 1);
|
|
}
|
|
if (LogFile != -1 && !connected) {
|
|
SyslogAddr.sun_len = sizeof(SyslogAddr);
|
|
SyslogAddr.sun_family = AF_UNIX;
|
|
(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
|
|
sizeof SyslogAddr.sun_path);
|
|
connected = connect(LogFile, (struct sockaddr *)&SyslogAddr,
|
|
sizeof(SyslogAddr)) != -1;
|
|
|
|
if (!connected) {
|
|
/*
|
|
* Try the old "/dev/log" path, for backward
|
|
* compatibility.
|
|
*/
|
|
(void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
|
|
sizeof SyslogAddr.sun_path);
|
|
connected = connect(LogFile,
|
|
(struct sockaddr *)&SyslogAddr,
|
|
sizeof(SyslogAddr)) != -1;
|
|
}
|
|
|
|
if (!connected) {
|
|
(void)close(LogFile);
|
|
LogFile = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
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 (LogStat & LOG_NDELAY) /* open immediately */
|
|
connectlog();
|
|
|
|
opened = 1; /* ident and facility has been set */
|
|
}
|
|
|
|
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);
|
|
}
|