This patch contains changes to NetBSD libc code base to make it compile and work on Minix. Some of them are due to actual NetBSD libc bugs, as we're compiling it in non-reentrant mode and with a.out support, something not exactly frequent in NetBSD. Others are proper fixes to port it to Minix (mostly sa_len parameter missing in socket and a few mmap from files).
573 lines
14 KiB
C
573 lines
14 KiB
C
/* $NetBSD: syslog.c,v 1.48 2010/05/13 22:40:14 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 1.48 2010/05/13 22:40:14 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/param.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(syslogp,_syslogp)
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__weak_alias(vsyslogp,_vsyslogp)
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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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__weak_alias(syslogp_r,_syslogp_r)
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__weak_alias(vsyslogp_r,_vsyslogp_r)
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__weak_alias(syslogp_ss,_syslogp_ss)
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__weak_alias(vsyslogp_ss,_vsyslogp_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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static char hostname[MAXHOSTNAMELEN];
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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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/*
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* syslogp, vsyslogp --
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* like syslog but take additional arguments for MSGID and SD
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*/
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void
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syslogp(int pri, const char *msgid, const char *sdfmt, const char *msgfmt, ...)
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{
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va_list ap;
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va_start(ap, msgfmt);
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vsyslogp(pri, msgid, sdfmt, msgfmt, ap);
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va_end(ap);
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}
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void
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vsyslogp(int pri, const char *msgid, const char *sdfmt, const char *msgfmt, va_list ap)
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{
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vsyslogp_r(pri, &sdata, msgid, sdfmt, msgfmt, 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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syslogp_r(int pri, struct syslog_data *data, const char *msgid,
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const char *sdfmt, const char *msgfmt, ...)
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{
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va_list ap;
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va_start(ap, msgfmt);
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vsyslogp_r(pri, data, msgid, sdfmt, msgfmt, 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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syslogp_ss(int pri, struct syslog_data *data, const char *msgid,
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const char *sdfmt, const char *msgfmt, ...)
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{
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va_list ap;
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va_start(ap, msgfmt);
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vsyslogp_r(pri | LOG_SIGNAL_SAFE, data, msgid, sdfmt, msgfmt, 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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vsyslogp_ss(int pri, struct syslog_data *data, const char *msgid,
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const char *sdfmt, const char *msgfmt, va_list ap)
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{
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vsyslogp_r(pri | LOG_SIGNAL_SAFE, data, msgid, sdfmt, msgfmt, 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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vsyslogp_r(pri, data, NULL, NULL, fmt, ap);
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}
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void
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vsyslogp_r(int pri, struct syslog_data *data, const char *msgid,
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const char *sdfmt, const char *msgfmt, va_list ap)
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{
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static const char BRCOSP[] = "]: ";
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static const char CRLF[] = "\r\n";
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size_t cnt, prlen, tries;
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char ch, *p, *t;
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struct timeval tv;
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struct tm tmnow;
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time_t now;
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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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#define MAXTRIES 10
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char tbuf[TBUF_LEN], fmt_cpy[FMT_LEN], fmt_cat[FMT_LEN] = "";
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size_t tbuf_left, fmt_left, msgsdlen;
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char *fmt = fmt_cat;
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int signal_safe = pri & LOG_SIGNAL_SAFE;
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struct iovec iov[7]; /* prog + [ + pid + ]: + fmt + crlf */
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int opened, iovcnt;
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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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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>1 ", pri);
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DEC();
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if (!signal_safe && (gettimeofday(&tv, NULL) != -1)) {
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/* strftime() implies tzset(), localtime_r() doesn't. */
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tzset();
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now = (time_t) tv.tv_sec;
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localtime_r(&now, &tmnow);
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prlen = strftime(p, tbuf_left, "%FT%T", &tmnow);
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DEC();
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prlen = snprintf(p, tbuf_left, ".%06ld", (long)tv.tv_usec);
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DEC();
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prlen = strftime(p, tbuf_left-1, "%z", &tmnow);
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/* strftime gives eg. "+0200", but we need "+02:00" */
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if (prlen == 5) {
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p[prlen+1] = p[prlen];
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p[prlen] = p[prlen-1];
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p[prlen-1] = p[prlen-2];
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p[prlen-2] = ':';
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prlen += 1;
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}
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} else {
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prlen = snprintf_ss(p, tbuf_left, "-");
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/* if gmtime_r() was signal-safe we could output the UTC-time:
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gmtime_r(&now, &tmnow);
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prlen = strftime(p, tbuf_left, "%FT%TZ", &tmnow);
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*/
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}
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DEC();
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prlen = snprintf_ss(p, tbuf_left, " %s ", hostname);
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DEC();
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if (data->log_tag == NULL)
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data->log_tag = getprogname();
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prlen = snprintf_ss(p, tbuf_left, "%s ",
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data->log_tag ? data->log_tag : "-");
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if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
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iovcnt = 0;
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iov[iovcnt].iov_base = p;
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iov[iovcnt].iov_len = prlen - 1;
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iovcnt++;
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}
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DEC();
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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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if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
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iov[iovcnt].iov_base = __UNCONST("[");
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iov[iovcnt].iov_len = 1;
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iovcnt++;
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iov[iovcnt].iov_base = p;
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iov[iovcnt].iov_len = prlen - 1;
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iovcnt++;
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iov[iovcnt].iov_base = __UNCONST(BRCOSP);
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iov[iovcnt].iov_len = 3;
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iovcnt++;
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}
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} else {
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prlen = snprintf_ss(p, tbuf_left, "- ");
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if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
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iov[iovcnt].iov_base = __UNCONST(BRCOSP + 1);
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iov[iovcnt].iov_len = 2;
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iovcnt++;
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}
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}
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DEC();
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/*
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* concat the format strings, then use one vsnprintf()
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*/
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if (msgid != NULL && *msgid != '\0') {
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strlcat(fmt_cat, msgid, FMT_LEN);
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strlcat(fmt_cat, " ", FMT_LEN);
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} else
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strlcat(fmt_cat, "- ", FMT_LEN);
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if (sdfmt != NULL && *sdfmt != '\0') {
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strlcat(fmt_cat, sdfmt, FMT_LEN);
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} else
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strlcat(fmt_cat, "-", FMT_LEN);
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if (data->log_stat & (LOG_PERROR|LOG_CONS))
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msgsdlen = strlen(fmt_cat) + 1;
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else
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msgsdlen = 0; /* XXX: GCC */
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if (msgfmt != NULL && *msgfmt != '\0') {
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strlcat(fmt_cat, " ", FMT_LEN);
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strlcat(fmt_cat, msgfmt, FMT_LEN);
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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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if (data->log_stat & (LOG_PERROR|LOG_CONS)) {
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iov[iovcnt].iov_base = p + msgsdlen;
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iov[iovcnt].iov_len = prlen - msgsdlen;
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iovcnt++;
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}
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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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iov[iovcnt].iov_base = __UNCONST(CRLF + 1);
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iov[iovcnt].iov_len = 1;
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(void)writev(STDERR_FILENO, iov, iovcnt + 1);
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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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opened = !data->opened;
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if (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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for (tries = 0; tries < MAXTRIES; tries++) {
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if (send(data->log_file, tbuf, cnt, 0) != -1)
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break;
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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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} else
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(void)usleep(1);
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}
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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 (tries == MAXTRIES && (data->log_stat & LOG_CONS) &&
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(fd = open(_PATH_CONSOLE, O_WRONLY|O_NONBLOCK, 0)) >= 0) {
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iov[iovcnt].iov_base = __UNCONST(CRLF);
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iov[iovcnt].iov_len = 2;
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(void)writev(fd, iov, iovcnt + 1);
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(void)close(fd);
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}
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if (data == &sdata)
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mutex_unlock(&syslog_mutex);
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if (data != &sdata && opened) {
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/* preserve log tag */
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const char *ident = data->log_tag;
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closelog_r(data);
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data->log_tag = ident;
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}
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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 */
|
|
static const struct sockaddr_un sun = {
|
|
.sun_family = AF_LOCAL,
|
|
#ifndef __minix
|
|
.sun_len = sizeof(sun),
|
|
#endif
|
|
.sun_path = _PATH_LOG,
|
|
};
|
|
|
|
if (data->log_file == -1 || fcntl(data->log_file, F_GETFL, 0) == -1) {
|
|
if ((data->log_file = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
|
|
return;
|
|
(void)fcntl(data->log_file, F_SETFD, FD_CLOEXEC);
|
|
data->connected = 0;
|
|
}
|
|
if (!data->connected) {
|
|
if (connect(data->log_file,
|
|
(const struct sockaddr *)(const void *)&sun,
|
|
sizeof(sun)) == -1) {
|
|
(void)close(data->log_file);
|
|
data->log_file = -1;
|
|
} else
|
|
data->connected = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
openlog_unlocked_r(const char *ident, int logstat, int logfac,
|
|
struct syslog_data *data)
|
|
{
|
|
if (ident != NULL)
|
|
data->log_tag = ident;
|
|
data->log_stat = logstat;
|
|
if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
|
|
data->log_fac = logfac;
|
|
|
|
if (data->log_stat & LOG_NDELAY) /* open immediately */
|
|
connectlog_r(data);
|
|
|
|
/* We could cache this, but then it might change */
|
|
if (gethostname(hostname, sizeof(hostname)) == -1
|
|
|| hostname[0] == '\0') {
|
|
/* can this really happen? */
|
|
hostname[0] = '-';
|
|
hostname[1] = '\0';
|
|
}
|
|
data->opened = 1;
|
|
}
|
|
|
|
void
|
|
openlog_r(const char *ident, int logstat, int logfac, struct syslog_data *data)
|
|
{
|
|
if (data == &sdata)
|
|
mutex_lock(&syslog_mutex);
|
|
openlog_unlocked_r(ident, logstat, logfac, data);
|
|
if (data == &sdata)
|
|
mutex_unlock(&syslog_mutex);
|
|
}
|
|
|
|
void
|
|
closelog_r(struct syslog_data *data)
|
|
{
|
|
if (data == &sdata)
|
|
mutex_lock(&syslog_mutex);
|
|
(void)close(data->log_file);
|
|
data->log_file = -1;
|
|
data->connected = 0;
|
|
data->log_tag = NULL;
|
|
if (data == &sdata)
|
|
mutex_unlock(&syslog_mutex);
|
|
}
|
|
|
|
int
|
|
setlogmask_r(int pmask, struct syslog_data *data)
|
|
{
|
|
int omask;
|
|
|
|
omask = data->log_mask;
|
|
if (pmask != 0)
|
|
data->log_mask = pmask;
|
|
return omask;
|
|
}
|