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[glibc.git] / misc / syslog.c
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1 /*
2 * Copyright (c) 1983, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
41 #include <sys/uio.h>
42 #include <netdb.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <paths.h>
47 #include <stdio.h>
48 #include <string.h>
49 #include <time.h>
50 #include <unistd.h>
51 #include <stdlib.h>
52 #include <bits/libc-lock.h>
53 #include <signal.h>
55 #if __STDC__
56 #include <stdarg.h>
57 #else
58 #include <varargs.h>
59 #endif
61 #ifdef USE_IN_LIBIO
62 # include <libio/iolibio.h>
63 # define ftell(s) _IO_ftell (s)
64 #endif
66 static int LogType = SOCK_DGRAM; /* type of socket connection */
67 static int LogFile = -1; /* fd for log */
68 static int connected; /* have done connect */
69 static int LogStat = 0; /* status bits, set by openlog() */
70 static const char *LogTag = NULL; /* string to tag the entry with */
71 static int LogFacility = LOG_USER; /* default facility code */
72 static int LogMask = 0xff; /* mask of priorities to be logged */
73 extern char *__progname; /* Program name, from crt0. */
75 /* Define the lock. */
76 __libc_lock_define_initialized (static, syslog_lock)
78 static void openlog_internal(const char *, int, int) internal_function;
79 static void closelog_internal(void);
80 static void sigpipe_handler (int);
81 #ifdef _LIBC_REENTRANT
82 static void cancel_handler (void *);
83 #endif
86 * syslog, vsyslog --
87 * print message on log file; output is intended for syslogd(8).
89 void
90 #if __STDC__
91 syslog(int pri, const char *fmt, ...)
92 #else
93 syslog(pri, fmt, va_alist)
94 int pri;
95 char *fmt;
96 va_dcl
97 #endif
99 va_list ap;
101 #if __STDC__
102 va_start(ap, fmt);
103 #else
104 va_start(ap);
105 #endif
106 vsyslog(pri, fmt, ap);
107 va_end(ap);
110 void
111 vsyslog(pri, fmt, ap)
112 int pri;
113 register const char *fmt;
114 va_list ap;
116 struct tm now_tm;
117 time_t now;
118 int fd;
119 FILE *f;
120 char *buf = 0;
121 size_t bufsize = 0;
122 size_t prioff, msgoff;
123 struct sigaction action, oldaction;
124 struct sigaction *oldaction_ptr = NULL;
125 int sigpipe;
127 #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
128 /* Check for invalid bits. */
129 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
130 syslog(INTERNALLOG,
131 "syslog: unknown facility/priority: %x", pri);
132 pri &= LOG_PRIMASK|LOG_FACMASK;
135 /* Check priority against setlogmask values. */
136 if (!LOG_MASK(LOG_PRI(pri)) & LogMask)
137 return;
139 /* Set default facility if none specified. */
140 if ((pri & LOG_FACMASK) == 0)
141 pri |= LogFacility;
143 /* Build the message in a memory-buffer stream. */
144 f = open_memstream (&buf, &bufsize);
145 prioff = fprintf (f, "<%d>", pri);
146 (void) time (&now);
147 #ifdef USE_IN_LIBIO
148 f->_IO_write_ptr += strftime (f->_IO_write_ptr,
149 f->_IO_write_end - f->_IO_write_ptr,
150 "%h %e %T ",
151 __localtime_r (&now, &now_tm));
152 #else
153 f->__bufp += strftime (f->__bufp, f->__put_limit - f->__bufp,
154 "%h %e %T ", __localtime_r (&now, &now_tm));
155 #endif
156 msgoff = ftell (f);
157 if (LogTag == NULL)
158 LogTag = __progname;
159 if (LogTag != NULL)
160 fputs_unlocked (LogTag, f);
161 if (LogStat & LOG_PID)
162 fprintf (f, "[%d]", __getpid ());
163 if (LogTag != NULL)
164 putc_unlocked (':', f), putc_unlocked (' ', f);
166 /* We have the header. Print the user's format into the buffer. */
167 vfprintf (f, fmt, ap);
169 /* Close the memory stream; this will finalize the data
170 into a malloc'd buffer in BUF. */
171 fclose (f);
173 /* Output to stderr if requested. */
174 if (LogStat & LOG_PERROR) {
175 struct iovec iov[2];
176 register struct iovec *v = iov;
178 v->iov_base = buf + msgoff;
179 v->iov_len = bufsize - msgoff;
180 ++v;
181 v->iov_base = (char *) "\n";
182 v->iov_len = 1;
183 (void)__writev(STDERR_FILENO, iov, 2);
186 /* Prepare for multiple users. We have to take care: open and
187 write are cancellation points. */
188 __libc_cleanup_region_start ((void (*) (void *)) cancel_handler,
189 &oldaction_ptr);
190 __libc_lock_lock (syslog_lock);
192 /* Prepare for a broken connection. */
193 memset (&action, 0, sizeof (action));
194 action.sa_handler = sigpipe_handler;
195 sigemptyset (&action.sa_mask);
196 sigpipe = __sigaction (SIGPIPE, &action, &oldaction);
197 if (sigpipe == 0)
198 oldaction_ptr = &oldaction;
200 /* Get connected, output the message to the local logger. */
201 if (!connected)
202 openlog_internal(LogTag, LogStat | LOG_NDELAY, 0);
204 /* If we have a SOCK_STREAM connection, also send ASCII NUL as
205 a record terminator. */
206 if (LogType == SOCK_STREAM)
207 ++bufsize;
209 if (!connected || __send(LogFile, buf, bufsize, 0) < 0)
211 closelog_internal (); /* attempt re-open next time */
213 * Output the message to the console; don't worry about blocking,
214 * if console blocks everything will. Make sure the error reported
215 * is the one from the syslogd failure.
217 if (LogStat & LOG_CONS &&
218 (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0)
220 dprintf (fd, "%s\r\n", buf + msgoff);
221 (void)__close(fd);
225 if (sigpipe == 0)
226 __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL);
228 /* End of critical section. */
229 __libc_cleanup_region_end (0);
230 __libc_lock_unlock (syslog_lock);
232 free (buf);
235 static struct sockaddr SyslogAddr; /* AF_UNIX address of local logger */
237 static void
238 internal_function
239 openlog_internal(const char *ident, int logstat, int logfac)
241 if (ident != NULL)
242 LogTag = ident;
243 LogStat = logstat;
244 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
245 LogFacility = logfac;
247 while (1) {
248 if (LogFile == -1) {
249 SyslogAddr.sa_family = AF_UNIX;
250 (void)strncpy(SyslogAddr.sa_data, _PATH_LOG,
251 sizeof(SyslogAddr.sa_data));
252 if (LogStat & LOG_NDELAY) {
253 if ((LogFile = __socket(AF_UNIX, LogType, 0))
254 == -1)
255 return;
256 (void)__fcntl(LogFile, F_SETFD, 1);
259 if (LogFile != -1 && !connected)
261 int old_errno = errno;
262 if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr))
263 == -1)
265 int saved_errno = errno;
266 (void)__close(LogFile);
267 LogFile = -1;
268 if (LogType == SOCK_DGRAM
269 && saved_errno == EPROTOTYPE)
271 /* retry with next SOCK_STREAM: */
272 LogType = SOCK_STREAM;
273 __set_errno (old_errno);
274 continue;
276 } else
277 connected = 1;
279 break;
283 void
284 openlog (const char *ident, int logstat, int logfac)
286 /* Protect against multiple users. */
287 __libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
288 &syslog_lock);
289 __libc_lock_lock (syslog_lock);
291 openlog_internal (ident, logstat, logfac);
293 /* Free the lock. */
294 __libc_cleanup_region_end (1);
297 static void
298 sigpipe_handler (int signo)
300 closelog_internal ();
303 static void
304 closelog_internal()
306 if (!connected)
307 return;
309 __close (LogFile);
310 LogFile = -1;
311 connected = 0;
312 LogTag = NULL;
315 void
316 closelog ()
318 /* Protect against multiple users. */
319 __libc_cleanup_region_start ((void (*) __P ((void *))) __libc_mutex_unlock,
320 &syslog_lock);
321 __libc_lock_lock (syslog_lock);
323 closelog_internal ();
325 /* Free the lock. */
326 __libc_cleanup_region_end (1);
329 #ifdef _LIBC_REENTRANT
330 static void
331 cancel_handler (void *ptr)
333 /* Restore the old signal handler. */
334 struct sigaction *oldaction = *((struct sigaction **) ptr);
336 if (oldaction != (struct sigaction *) NULL)
337 __sigaction (SIGPIPE, oldaction, (struct sigaction *) NULL);
339 /* Free the lock. */
340 __libc_lock_unlock (syslog_lock);
342 #endif
344 /* setlogmask -- set the log mask level */
346 setlogmask(pmask)
347 int pmask;
349 int omask;
351 omask = LogMask;
352 if (pmask != 0)
353 LogMask = pmask;
354 return (omask);