49d53cd636
syslogd after we called openlog(), we don't just to lose until we call openlog() again. Or get restarted. This is good for long running processes that use syslog(), like sendmail, postfix, named, etc.
362 lines
8.8 KiB
C
362 lines
8.8 KiB
C
/* $NetBSD: syslog.c,v 1.27 2001/07/30 04:12:33 atatat Exp $ */
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/*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 4/29/95";
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#else
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__RCSID("$NetBSD: syslog.c,v 1.27 2001/07/30 04:12:33 atatat Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <netdb.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "reentrant.h"
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#ifdef __weak_alias
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__weak_alias(closelog,_closelog)
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__weak_alias(openlog,_openlog)
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__weak_alias(setlogmask,_setlogmask)
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__weak_alias(syslog,_syslog)
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__weak_alias(vsyslog,_vsyslog)
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#endif
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static int LogFile = -1; /* fd for log */
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static int connected; /* have done connect */
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static int LogStat = 0; /* status bits, set by openlog() */
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static const char *LogTag = NULL; /* string to tag the entry with */
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static int LogFacility = LOG_USER; /* default facility code */
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static int LogMask = 0xff; /* mask of priorities to be logged */
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static void openlog_unlocked __P((const char *, int, int));
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static void closelog_unlocked __P((void));
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#ifdef _REENT
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static mutex_t syslog_mutex = MUTEX_INITIALIZER;
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#endif
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#ifdef lint
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static const int ZERO = 0;
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#else
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#define ZERO 0
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#endif
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/*
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* syslog, vsyslog --
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* print message on log file; output is intended for syslogd(8).
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*/
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void
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#if __STDC__
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syslog(int pri, const char *fmt, ...)
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#else
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syslog(pri, fmt, va_alist)
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int pri;
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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vsyslog(pri, fmt, ap);
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va_end(ap);
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}
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void
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vsyslog(pri, fmt, ap)
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int pri;
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const char *fmt;
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_BSD_VA_LIST_ ap;
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{
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size_t cnt;
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char ch, *p, *t;
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time_t now;
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struct tm tmnow;
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int fd, saved_errno, tries;
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#define TBUF_LEN 2048
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#define FMT_LEN 1024
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char *stdp = NULL; /* pacify gcc */
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char tbuf[TBUF_LEN], fmt_cpy[FMT_LEN];
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size_t tbuf_left, fmt_left, prlen;
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#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
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/* Check for invalid bits. */
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if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
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syslog(INTERNALLOG,
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"syslog: unknown facility/priority: %x", pri);
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pri &= LOG_PRIMASK|LOG_FACMASK;
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}
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/* Check priority against setlogmask values. */
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if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
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return;
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saved_errno = errno;
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/* Set default facility if none specified. */
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if ((pri & LOG_FACMASK) == 0)
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pri |= LogFacility;
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/* Build the message. */
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/*
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* Although it's tempting, we can't ignore the possibility of
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* overflowing the buffer when assembling the "fixed" portion
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* of the message. Strftime's "%h" directive expands to the
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* locale's abbreviated month name, but if the user has the
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* ability to construct to his own locale files, it may be
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* arbitrarily long.
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*/
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(void)time(&now);
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p = tbuf;
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tbuf_left = TBUF_LEN;
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#define DEC() \
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do { \
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if (prlen >= tbuf_left) \
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prlen = tbuf_left - 1; \
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p += prlen; \
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tbuf_left -= prlen; \
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} while (ZERO)
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prlen = snprintf(p, tbuf_left, "<%d>", pri);
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DEC();
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tzset(); /* strftime() implies tzset(), localtime_r() doesn't. */
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prlen = strftime(p, tbuf_left, "%h %e %T ", localtime_r(&now, &tmnow));
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DEC();
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if (LogStat & LOG_PERROR)
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stdp = p;
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if (LogTag == NULL)
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LogTag = getprogname();
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if (LogTag != NULL) {
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prlen = snprintf(p, tbuf_left, "%s", LogTag);
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DEC();
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}
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if (LogStat & LOG_PID) {
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prlen = snprintf(p, tbuf_left, "[%d]", getpid());
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DEC();
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}
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if (LogTag != NULL) {
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if (tbuf_left > 1) {
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*p++ = ':';
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tbuf_left--;
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}
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if (tbuf_left > 1) {
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*p++ = ' ';
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tbuf_left--;
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}
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}
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/*
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* We wouldn't need this mess if printf handled %m, or if
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* strerror() had been invented before syslog().
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*/
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for (t = fmt_cpy, fmt_left = FMT_LEN; (ch = *fmt) != '\0'; ++fmt) {
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if (ch == '%' && fmt[1] == 'm') {
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++fmt;
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prlen = snprintf(t, fmt_left, "%s",
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strerror(saved_errno));
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if (prlen >= fmt_left)
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prlen = fmt_left - 1;
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t += prlen;
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fmt_left -= prlen;
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} else {
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if (fmt_left > 1) {
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*t++ = ch;
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fmt_left--;
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}
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}
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}
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*t = '\0';
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prlen = vsnprintf(p, tbuf_left, fmt_cpy, ap);
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DEC();
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cnt = p - tbuf;
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/* Output to stderr if requested. */
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if (LogStat & LOG_PERROR) {
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struct iovec iov[2];
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iov[0].iov_base = stdp;
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iov[0].iov_len = cnt - (stdp - tbuf);
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iov[1].iov_base = "\n";
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iov[1].iov_len = 1;
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(void)writev(STDERR_FILENO, iov, 2);
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}
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/* Get connected, output the message to the local logger. */
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mutex_lock(&syslog_mutex);
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/*
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* Try to send it twice. If the first try fails, we might
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* be able to simply reconnect and send the message (which
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* means syslogd was restarted since we connected the first
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* time). If the second attempt doesn't work, then something
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* else is wrong and there's probably not much we can do
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* here.
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*/
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for (tries = 1; tries <= 2; tries++) {
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if (!connected)
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openlog_unlocked(LogTag, LogStat | LOG_NDELAY, 0);
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if (send(LogFile, tbuf, cnt, 0) >= 0) {
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mutex_unlock(&syslog_mutex);
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return;
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}
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else
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closelog_unlocked();
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}
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mutex_unlock(&syslog_mutex);
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/*
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* Output the message to the console; don't worry about blocking,
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* if console blocks everything will. Make sure the error reported
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* is the one from the syslogd failure.
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*/
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if (LogStat & LOG_CONS &&
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(fd = open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
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struct iovec iov[2];
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p = strchr(tbuf, '>') + 1;
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iov[0].iov_base = p;
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iov[0].iov_len = cnt - (p - tbuf);
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iov[1].iov_base = "\r\n";
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iov[1].iov_len = 2;
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(void)writev(fd, iov, 2);
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(void)close(fd);
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}
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}
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static struct sockaddr_un SyslogAddr; /* AF_LOCAL address of local logger */
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static void
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openlog_unlocked(ident, logstat, logfac)
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const char *ident;
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int logstat, logfac;
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{
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if (ident != NULL)
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LogTag = ident;
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LogStat = logstat;
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if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
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LogFacility = logfac;
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if (LogFile == -1) {
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SyslogAddr.sun_family = AF_LOCAL;
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(void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
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sizeof(SyslogAddr.sun_path));
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if (LogStat & LOG_NDELAY) {
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if ((LogFile = socket(AF_LOCAL, SOCK_DGRAM, 0)) == -1)
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return;
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(void)fcntl(LogFile, F_SETFD, 1);
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}
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}
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if (LogFile != -1 && !connected) {
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if (connect(LogFile, (struct sockaddr *)(void *)&SyslogAddr,
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SUN_LEN(&SyslogAddr)) == -1) {
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(void)close(LogFile);
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LogFile = -1;
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} else
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connected = 1;
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}
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}
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void
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openlog(ident, logstat, logfac)
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const char *ident;
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int logstat, logfac;
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{
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mutex_lock(&syslog_mutex);
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openlog_unlocked(ident, logstat, logfac);
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mutex_unlock(&syslog_mutex);
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}
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static void
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closelog_unlocked()
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{
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(void)close(LogFile);
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LogFile = -1;
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connected = 0;
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}
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void
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closelog()
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{
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mutex_lock(&syslog_mutex);
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closelog_unlocked();
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mutex_unlock(&syslog_mutex);
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}
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/* setlogmask -- set the log mask level */
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int
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setlogmask(pmask)
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int pmask;
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{
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int omask;
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omask = LogMask;
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if (pmask != 0)
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LogMask = pmask;
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return (omask);
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}
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