1995-02-18 02:27:10 +01:00
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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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94";
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#endif /* LIBC_SCCS and not lint */
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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 <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 <string.h>
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#include <time.h>
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#include <unistd.h>
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1995-09-21 08:24:21 +02:00
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#include <stdlib.h>
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1996-12-07 04:30:25 +01:00
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#include <libc-lock.h>
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#include <signal.h>
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1995-02-18 02:27:10 +01:00
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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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1996-08-09 04:46:09 +02:00
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static int LogType = SOCK_DGRAM; /* type of socket connection */
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1995-02-18 02:27:10 +01:00
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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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extern char *__progname; /* Program name, from crt0. */
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1996-12-07 04:30:25 +01:00
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/* Define the lock. */
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__libc_lock_define_initialized (static, syslog_lock)
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static void openlog_internal(const char *, int, int);
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static void closelog_internal(void);
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static void sigpipe_handler (int);
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static void cancel_handler (void *);
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1995-02-18 02:27:10 +01:00
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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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register const char *fmt;
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va_list ap;
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{
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1996-08-26 12:28:45 +02:00
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struct tm now_tm;
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1995-02-18 02:27:10 +01:00
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time_t now;
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1995-09-21 08:24:21 +02:00
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int fd;
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FILE *f;
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char *buf = 0;
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size_t bufsize = 0;
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size_t prioff, msgoff;
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1996-12-07 04:30:25 +01:00
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struct sigaction action, oldaction;
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struct sigaction *oldaction_ptr = NULL;
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int sigpipe;
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1995-02-18 02:27:10 +01:00
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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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/* 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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1995-09-21 08:24:21 +02:00
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/* Build the message in a memory-buffer stream. */
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f = open_memstream (&buf, &bufsize);
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prioff = fprintf (f, "<%d>", pri);
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(void) time (&now);
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1995-11-26 18:32:10 +01:00
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#ifdef USE_IN_LIBIO
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f->_IO_write_ptr += strftime (f->_IO_write_ptr,
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f->_IO_write_end - f->_IO_write_ptr,
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1996-08-26 12:28:45 +02:00
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"%h %e %T ",
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__localtime_r (&now, &now_tm));
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1995-11-26 18:32:10 +01:00
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#else
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1995-09-21 08:24:21 +02:00
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f->__bufp += strftime (f->__bufp, f->__put_limit - f->__bufp,
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1996-09-04 00:24:21 +02:00
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"%h %e %T ", __localtime_r (&now, &now_tm));
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1995-11-26 18:32:10 +01:00
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#endif
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1995-09-21 08:24:21 +02:00
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msgoff = ftell (f);
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1995-02-18 02:27:10 +01:00
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if (LogTag == NULL)
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1995-09-21 08:24:21 +02:00
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LogTag = __progname;
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1995-02-18 02:27:10 +01:00
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if (LogTag != NULL)
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1995-09-21 08:24:21 +02:00
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fputs (LogTag, f);
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1995-02-18 02:27:10 +01:00
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if (LogStat & LOG_PID)
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1995-09-21 08:24:21 +02:00
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fprintf (f, "[%d]", getpid ());
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if (LogTag != NULL)
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putc (':', f), putc (' ', f);
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1995-02-18 02:27:10 +01:00
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1995-09-21 08:24:21 +02:00
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/* We have the header. Print the user's format into the buffer. */
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vfprintf (f, fmt, ap);
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1995-02-18 02:27:10 +01:00
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1995-09-21 08:24:21 +02:00
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/* Close the memory stream; this will finalize the data
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into a malloc'd buffer in BUF. */
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fclose (f);
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1995-02-18 02:27:10 +01:00
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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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register struct iovec *v = iov;
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1995-09-21 08:24:21 +02:00
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v->iov_base = buf + msgoff;
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v->iov_len = bufsize - msgoff;
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1995-02-18 02:27:10 +01:00
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++v;
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1995-09-21 08:24:21 +02:00
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v->iov_base = (char *) "\n";
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1995-02-18 02:27:10 +01:00
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v->iov_len = 1;
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(void)writev(STDERR_FILENO, iov, 2);
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}
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1996-12-07 04:30:25 +01:00
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/* Prepare for multiple users. We have to take care: open and
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write are cancelation points. */
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1996-12-09 04:15:25 +01:00
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__libc_cleanup_region_start ((void (*) (void *)) cancel_handler,
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&oldaction_ptr);
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1996-12-07 04:30:25 +01:00
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__libc_lock_lock (syslog_lock);
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/* Prepare for a broken connection. */
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memset (&action, 0, sizeof (action));
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action.sa_handler = sigpipe_handler;
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sigemptyset (&action.sa_mask);
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sigpipe = sigaction (SIGPIPE, &action, &oldaction);
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if (sigpipe == 0)
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oldaction_ptr = &oldaction;
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1995-02-18 02:27:10 +01:00
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/* Get connected, output the message to the local logger. */
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if (!connected)
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1996-12-07 04:30:25 +01:00
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openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
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1996-08-09 04:46:09 +02:00
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/* If we have a SOCK_STREAM connection, also send ASCII NUL as
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a record terminator. */
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if (LogType == SOCK_STREAM)
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++bufsize;
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1996-07-05 21:18:13 +02:00
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if (__send(LogFile, buf, bufsize, 0) < 0)
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1995-09-21 08:24:21 +02:00
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{
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1996-12-07 04:30:25 +01:00
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closelog_internal (); /* attempt re-open next time */
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1995-09-21 08:24:21 +02:00
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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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{
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dprintf (fd, "%s\r\n", buf + msgoff);
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1995-02-18 02:27:10 +01:00
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(void)close(fd);
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1995-09-21 08:24:21 +02:00
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}
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}
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1996-12-07 04:30:25 +01:00
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if (sigpipe == 0)
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sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
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/* End of critical section. */
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__libc_cleanup_region_end (0);
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__libc_lock_unlock (syslog_lock);
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1995-09-21 08:24:21 +02:00
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free (buf);
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1995-02-18 02:27:10 +01:00
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}
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static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
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1996-12-07 04:30:25 +01:00
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static void
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openlog_internal(const char *ident, int logstat, int logfac)
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1995-02-18 02:27:10 +01:00
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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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1996-08-09 04:46:09 +02:00
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while (1) {
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if (LogFile == -1) {
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SyslogAddr.sa_family = AF_UNIX;
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(void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
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sizeof(SyslogAddr.sa_data));
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if (LogStat & LOG_NDELAY) {
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if ((LogFile = socket(AF_UNIX, LogType, 0))
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== -1)
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return;
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(void)fcntl(LogFile, F_SETFD, 1);
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}
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1995-02-18 02:27:10 +01:00
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}
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1996-08-09 04:46:09 +02:00
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if (LogFile != -1 && !connected)
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if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
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== -1)
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{
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int saved_errno = errno;
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(void)close(LogFile);
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LogFile = -1;
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if (LogType == SOCK_DGRAM
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&& saved_errno == EPROTOTYPE)
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{
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/* retry with next SOCK_STREAM: */
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LogType = SOCK_STREAM;
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continue;
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}
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} else
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connected = 1;
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break;
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1995-02-18 02:27:10 +01:00
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}
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}
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void
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1996-12-07 04:30:25 +01:00
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openlog (const char *ident, int logstat, int logfac)
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{
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/* Protect against multiple users. */
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__libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
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&syslog_lock);
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__libc_lock_lock (syslog_lock);
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openlog_internal (ident, logstat, logfac);
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/* Free the lock. */
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__libc_cleanup_region_end (1);
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}
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static void
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sigpipe_handler (int signo)
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{
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closelog_internal();
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}
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static void
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closelog_internal()
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1995-02-18 02:27:10 +01:00
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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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1996-12-07 04:30:25 +01:00
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void
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closelog ()
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{
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/* Protect against multiple users. */
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__libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
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&syslog_lock);
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__libc_lock_lock (syslog_lock);
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closelog_internal ();
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/* Free the lock. */
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__libc_cleanup_region_end (1);
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}
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static void
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cancel_handler (void *ptr)
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{
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/* Restore the old signal handler. */
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struct sigaction *oldaction = *((struct sigaction **) ptr);
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if (oldaction != (struct sigaction *) NULL)
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sigaction (SIGPIPE, oldaction, (struct sigaction *) NULL);
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/* Free the lock. */
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__libc_lock_unlock (syslog_lock);
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}
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1995-02-18 02:27:10 +01:00
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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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