440 lines
11 KiB
C
440 lines
11 KiB
C
/* $NetBSD: syslog.c,v 1.39 2006/11/22 17:23:25 christos 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 1.39 2006/11/22 17:23:25 christos 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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#include "extern.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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__weak_alias(closelog_r,_closelog_r)
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__weak_alias(openlog_r,_openlog_r)
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__weak_alias(setlogmask_r,_setlogmask_r)
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__weak_alias(syslog_r,_syslog_r)
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__weak_alias(vsyslog_r,_vsyslog_r)
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__weak_alias(syslog_ss,_syslog_ss)
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__weak_alias(vsyslog_ss,_vsyslog_ss)
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#endif
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static struct syslog_data sdata = SYSLOG_DATA_INIT;
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static void openlog_unlocked_r(const char *, int, int,
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struct syslog_data *);
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static void disconnectlog_r(struct syslog_data *);
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static void connectlog_r(struct syslog_data *);
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#define LOG_SIGNAL_SAFE (int)0x80000000
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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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/*
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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(int pri, const char *fmt, va_list ap)
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{
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vsyslog_r(pri, &sdata, fmt, ap);
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}
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void
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openlog(const char *ident, int logstat, int logfac)
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{
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openlog_r(ident, logstat, logfac, &sdata);
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}
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void
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closelog(void)
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{
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closelog_r(&sdata);
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}
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/* setlogmask -- set the log mask level */
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int
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setlogmask(int pmask)
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{
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return setlogmask_r(pmask, &sdata);
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}
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/* Reentrant version of syslog, i.e. syslog_r() */
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void
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syslog_r(int pri, struct syslog_data *data, 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_r(pri, data, fmt, ap);
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va_end(ap);
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}
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void
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syslog_ss(int pri, struct syslog_data *data, 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_r(pri | LOG_SIGNAL_SAFE, data, fmt, ap);
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va_end(ap);
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}
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void
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vsyslog_ss(int pri, struct syslog_data *data, const char *fmt, va_list ap)
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{
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vsyslog_r(pri | LOG_SIGNAL_SAFE, data, fmt, ap);
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}
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void
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vsyslog_r(int pri, struct syslog_data *data, const char *fmt, va_list ap)
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{
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size_t cnt, prlen;
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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;
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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;
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int signal_safe = pri & LOG_SIGNAL_SAFE;
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pri &= ~LOG_SIGNAL_SAFE;
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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_r(INTERNALLOG | signal_safe, data,
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"syslog_r: 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)) & data->log_mask))
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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 |= data->log_fac;
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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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if (!signal_safe)
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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 (/*CONSTCOND*/0)
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prlen = snprintf_ss(p, tbuf_left, "<%d>", pri);
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DEC();
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if (!signal_safe) {
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/* strftime() implies tzset(), localtime_r() doesn't. */
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tzset();
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prlen = strftime(p, tbuf_left, "%h %e %T ",
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localtime_r(&now, &tmnow));
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DEC();
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}
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if (data->log_stat & LOG_PERROR)
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stdp = p;
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if (data->log_tag == NULL)
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data->log_tag = getprogname();
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if (data->log_tag != NULL) {
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prlen = snprintf_ss(p, tbuf_left, "%s", data->log_tag);
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DEC();
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}
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if (data->log_stat & LOG_PID) {
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prlen = snprintf_ss(p, tbuf_left, "[%d]", getpid());
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DEC();
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}
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if (data->log_tag != 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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char ebuf[128];
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++fmt;
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if (signal_safe ||
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strerror_r(saved_errno, ebuf, sizeof(ebuf)))
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prlen = snprintf_ss(t, fmt_left, "Error %d",
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saved_errno);
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else
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prlen = snprintf_ss(t, fmt_left, "%s", ebuf);
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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 if (ch == '%' && fmt[1] == '%' && fmt_left > 2) {
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*t++ = '%';
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*t++ = '%';
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fmt++;
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fmt_left -= 2;
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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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if (signal_safe)
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prlen = vsnprintf_ss(p, tbuf_left, fmt_cpy, ap);
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else
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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 (data->log_stat & 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 = __UNCONST("\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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if (data == &sdata)
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mutex_lock(&syslog_mutex);
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if (!data->opened)
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openlog_unlocked_r(data->log_tag, data->log_stat, 0, data);
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connectlog_r(data);
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/*
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* If the send() failed, there are two likely scenarios:
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* 1) syslogd was restarted
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* 2) /dev/log is out of socket buffer space
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* We attempt to reconnect to /dev/log to take care of
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* case #1 and keep send()ing data to cover case #2
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* to give syslogd a chance to empty its socket buffer.
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*/
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if (send(data->log_file, tbuf, cnt, 0) == -1) {
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if (errno != ENOBUFS) {
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disconnectlog_r(data);
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connectlog_r(data);
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}
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do {
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usleep(1);
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if (send(data->log_file, tbuf, cnt, 0) != -1)
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break;
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} while (errno == ENOBUFS);
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}
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if (data == &sdata)
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mutex_unlock(&syslog_mutex);
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/*
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* Output the message to the console; try not to block
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* as a blocking console should not stop other processes.
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* Make sure the error reported is the one from the syslogd failure.
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*/
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if ((data->log_stat & LOG_CONS) &&
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(fd = open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 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 = __UNCONST("\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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if (data != &sdata)
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closelog_r(data);
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}
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static void
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disconnectlog_r(struct syslog_data *data)
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{
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/*
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* If the user closed the FD and opened another in the same slot,
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* that's their problem. They should close it before calling on
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* system services.
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*/
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if (data->log_file != -1) {
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(void)close(data->log_file);
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data->log_file = -1;
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}
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data->connected = 0; /* retry connect */
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}
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static void
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connectlog_r(struct syslog_data *data)
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{
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/* AF_UNIX address of local logger */
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static const struct sockaddr_un sun = {
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.sun_family = AF_LOCAL,
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.sun_len = sizeof(sun),
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.sun_path = _PATH_LOG,
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};
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if (data->log_file == -1 || fcntl(data->log_file, F_GETFL, 0) == -1) {
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if ((data->log_file = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
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return;
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(void)fcntl(data->log_file, F_SETFD, FD_CLOEXEC);
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data->connected = 0;
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}
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if (!data->connected) {
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if (connect(data->log_file,
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(const struct sockaddr *)(const void *)&sun,
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sizeof(sun)) == -1) {
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(void)close(data->log_file);
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data->log_file = -1;
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} else
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data->connected = 1;
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}
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}
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static void
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openlog_unlocked_r(const char *ident, int logstat, int logfac,
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struct syslog_data *data)
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{
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if (ident != NULL)
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data->log_tag = ident;
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data->log_stat = logstat;
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if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
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data->log_fac = logfac;
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if (data->log_stat & LOG_NDELAY) /* open immediately */
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connectlog_r(data);
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}
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void
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openlog_r(const char *ident, int logstat, int logfac, struct syslog_data *data)
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{
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if (data == &sdata)
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mutex_lock(&syslog_mutex);
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openlog_unlocked_r(ident, logstat, logfac, data);
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if (data == &sdata)
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mutex_unlock(&syslog_mutex);
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}
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void
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closelog_r(struct syslog_data *data)
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{
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if (data == &sdata)
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mutex_lock(&syslog_mutex);
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(void)close(data->log_file);
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data->log_file = -1;
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data->connected = 0;
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data->log_tag = NULL;
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if (data == &sdata)
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mutex_unlock(&syslog_mutex);
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}
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int
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setlogmask_r(int pmask, struct syslog_data *data)
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{
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int omask;
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omask = data->log_mask;
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if (pmask != 0)
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data->log_mask = pmask;
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return omask;
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}
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