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/* This is a special version of syslog.c that has been modified to |
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** always use network sockets, so that it can be called from within |
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** a chroot() tree. It has also been made more portable. -JP |
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*/ |
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|
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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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|
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#ifdef __alpha |
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#define _XOPEN_SOURCE_EXTENDED |
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#endif |
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|
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/* Always use a network socket. This lets us run in a chroot() tree. */ |
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#define USE_INET |
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|
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#if defined(LIBC_SCCS) && !defined(lint) |
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static char sccsid[] = "@(#)syslog.c 8.9 (Berkeley) 9/4/95"; |
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#endif /* LIBC_SCCS and not lint */ |
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|
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#include <sys/param.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/uio.h> |
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#ifdef USE_INET |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#endif |
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#include <syslog.h> |
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#include <netdb.h> |
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|
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#include <errno.h> |
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#include <fcntl.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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|
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#ifdef HAVE_PATHS_H |
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# include <paths.h> |
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#endif |
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#ifndef _PATH_CONSOLE |
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# define _PATH_CONSOLE "/dev/console" |
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#endif |
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#ifndef _PATH_LOG |
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# define _PATH_LOG "/dev/log" |
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#endif |
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|
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#include <stdarg.h> |
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|
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#ifndef HAVE_STRERROR |
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char *strerror(int); |
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#endif |
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|
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#ifndef LOG_PRI |
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# define LOG_PRI(p) ((p) & LOG_PRIMASK) |
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#endif |
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|
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#ifndef LOG_PERROR |
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# define LOG_PERROR 0 |
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#endif |
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|
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#ifndef STDERR_FILENO |
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#define STDERR_FILENO 2 |
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#endif |
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|
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#define BUFSLOP 1024 /* overflow space */ |
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|
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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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#ifdef HAVE__PROGNAME |
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extern char *__progname; /* Program name, from crt0. */ |
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#else |
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char *__progname = NULL; |
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#endif |
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|
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void syslog(int pri, const char *fmt, ...); |
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void openlog(const char *ident, int logstat, int logfac); |
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void closelog(void); |
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|
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/* |
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* syslog -- |
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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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register int cnt; |
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register char ch, *p, *t; |
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time_t now; |
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int fd, saved_errno; |
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#ifndef HAVE_VSNPRINTF |
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int panic = 0; |
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#endif |
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static int maxsend = BUFSIZ; |
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char *stdp, fmt_cpy[1024], tbuf[BUFSIZ + BUFSLOP]; |
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va_list ap; |
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|
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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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|
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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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|
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saved_errno = errno; |
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|
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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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|
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/* Get connected. */ |
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if (!connected) |
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openlog(LogTag, LogStat | LOG_NDELAY, 0); |
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|
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/* Build the message. */ |
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(void)time(&now); |
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sprintf(tbuf, "<%d>", pri); |
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p = tbuf + strlen(tbuf); |
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strftime(p, sizeof (tbuf) - (p - tbuf), "%h %e %T ", localtime(&now)); |
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p += strlen(p); |
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stdp = p; |
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if (LogTag == NULL) |
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LogTag = __progname; |
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if (LogTag != NULL) { |
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char *q = strrchr(LogTag, '/'); |
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|
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if (q != NULL) |
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LogTag = ++q; |
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sprintf(p, "%.20s", LogTag); |
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p += strlen(p); |
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} |
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if (LogStat & LOG_PID) { |
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sprintf(p, "[%ld]", (long) getpid()); |
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p += strlen(p); |
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} |
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if (LogTag != NULL) { |
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*p++ = ':'; |
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*p++ = ' '; |
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} |
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|
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/* Substitute error message for %m. */ |
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for (t = fmt_cpy; (ch = *fmt) != '\0'; ++fmt) |
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if (ch == '%' && fmt[1] == 'm') { |
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++fmt; |
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strcpy(t, strerror(saved_errno)); |
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t += strlen(t); |
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} else |
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*t++ = ch; |
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*t = '\0'; |
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|
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va_start(ap, fmt); |
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#ifdef HAVE_VSNPRINTF |
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cnt = maxsend - (p - tbuf) + 1; |
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p += vsnprintf(p, cnt, fmt_cpy, ap); |
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cnt = p - tbuf; |
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#else |
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vsprintf(p, fmt_cpy, ap); |
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p += strlen(p); |
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cnt = p - tbuf; |
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if (cnt > sizeof tbuf) { |
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/* Panic condition. */ |
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panic = 1; |
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} |
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if (cnt > maxsend) |
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cnt = maxsend; |
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#endif |
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va_end(ap); |
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|
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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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|
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v->iov_base = stdp; |
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v->iov_len = cnt - (stdp - tbuf); |
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++v; |
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v->iov_base = "\n"; |
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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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|
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/* Output the message to the local logger. */ |
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for (;;) { |
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if (send(LogFile, tbuf, cnt, 0) >= 0) |
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goto done; |
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if (errno != EMSGSIZE || maxsend <= 256) |
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break; |
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|
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/* Message was too large -- back it off. */ |
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do { |
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maxsend -= 128; |
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} while (cnt < maxsend && maxsend > 256); |
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cnt = maxsend; |
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} |
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|
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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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(void)strcat(tbuf, "\r\n"); |
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cnt += 2; |
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p = strchr(tbuf, '>') + 1; |
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(void)write(fd, p, cnt - (p - tbuf)); |
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(void)close(fd); |
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} |
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|
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done: ; |
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#ifndef HAVE_VSNPRINTF |
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/* |
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* If we had a buffer overrun, log a panic and abort. |
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* We can't return because our stack is probably toast. |
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*/ |
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if (panic) { |
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syslog(LOG_EMERG, "SYSLOG BUFFER OVERRUN -- EXITING"); |
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abort(); |
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} |
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#endif |
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} |
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|
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static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */ |
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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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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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|
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if (LogFile == -1) { |
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#ifndef USE_INET |
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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, SOCK_DGRAM, 0)) == -1) |
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return; |
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(void)fcntl(LogFile, F_SETFD, 1); |
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} |
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#else |
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#define satosin(sa) ((struct sockaddr_in *)(sa)) |
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|
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satosin(&SyslogAddr)->sin_family = AF_INET; |
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satosin(&SyslogAddr)->sin_port = 514; |
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satosin(&SyslogAddr)->sin_addr.s_addr = inet_addr("127.0.0.1"); |
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if (LogStat & LOG_NDELAY) { |
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if ((LogFile = socket(AF_INET, SOCK_DGRAM, 0)) == -1) |
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return; |
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(void)fcntl(LogFile, F_SETFD, 1); |
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if (connect(LogFile, &SyslogAddr, |
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sizeof(SyslogAddr)) < 0) { |
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closelog(); |
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return; |
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} |
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} |
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#endif |
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} |
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if (LogFile != -1 && !connected) { |
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if (connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) == -1) { |
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(void)close(LogFile); |
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LogFile = -1; |
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} else |
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connected = 1; |
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} |
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} |
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|
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void |
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closelog(void) |
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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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|
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#ifdef notdef |
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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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int omask; |
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|
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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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#endif |
