342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
/* $NetBSD: syslog.c,v 1.30 2003/08/07 16:42:57 agc 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. 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 1.30 2003/08/07 16:42:57 agc 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 <stdarg.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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#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 _REENTRANT
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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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syslog(int pri, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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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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