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790aa1f2 UD |
1 | /* |
2 | * Copyright (c) 1983, 1988, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
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 | * 4. Neither the name of the University nor the names of its contributors | |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #if defined(LIBC_SCCS) && !defined(lint) | |
31 | static char sccsid[] = "@(#)syslog.c 8.4 (Berkeley) 3/18/94"; | |
32 | #endif /* LIBC_SCCS and not lint */ | |
33 | ||
34 | #include <sys/types.h> | |
35 | #include <sys/socket.h> | |
36 | #include <sys/syslog.h> | |
37 | #include <sys/uio.h> | |
7ab7969c | 38 | #include <sys/un.h> |
790aa1f2 UD |
39 | #include <netdb.h> |
40 | ||
41 | #include <errno.h> | |
42 | #include <fcntl.h> | |
43 | #include <paths.h> | |
44 | #include <stdio.h> | |
45 | #include <stdio_ext.h> | |
46 | #include <string.h> | |
47 | #include <time.h> | |
48 | #include <unistd.h> | |
49 | #include <stdlib.h> | |
ec999b8e | 50 | #include <libc-lock.h> |
790aa1f2 UD |
51 | #include <signal.h> |
52 | #include <locale.h> | |
53 | ||
790aa1f2 | 54 | #include <stdarg.h> |
790aa1f2 UD |
55 | |
56 | #include <libio/iolibio.h> | |
c6251f03 RM |
57 | #include <math_ldbl_opt.h> |
58 | ||
37233df9 TS |
59 | #include <kernel-features.h> |
60 | ||
d18ea0c5 | 61 | #define ftell(s) _IO_ftell (s) |
790aa1f2 UD |
62 | |
63 | static int LogType = SOCK_DGRAM; /* type of socket connection */ | |
64 | static int LogFile = -1; /* fd for log */ | |
65 | static int connected; /* have done connect */ | |
66 | static int LogStat; /* status bits, set by openlog() */ | |
67 | static const char *LogTag; /* string to tag the entry with */ | |
68 | static int LogFacility = LOG_USER; /* default facility code */ | |
69 | static int LogMask = 0xff; /* mask of priorities to be logged */ | |
70 | extern char *__progname; /* Program name, from crt0. */ | |
71 | ||
72 | /* Define the lock. */ | |
73 | __libc_lock_define_initialized (static, syslog_lock) | |
74 | ||
ab5bf7cf | 75 | static void openlog_internal(const char *, int, int); |
790aa1f2 | 76 | static void closelog_internal(void); |
4bb51523 | 77 | #ifndef NO_SIGPIPE |
790aa1f2 | 78 | static void sigpipe_handler (int); |
4bb51523 | 79 | #endif |
790aa1f2 | 80 | |
69553a9b RM |
81 | #ifndef send_flags |
82 | # define send_flags 0 | |
83 | #endif | |
790aa1f2 UD |
84 | |
85 | struct cleanup_arg | |
86 | { | |
87 | void *buf; | |
88 | struct sigaction *oldaction; | |
89 | }; | |
90 | ||
91 | static void | |
92 | cancel_handler (void *ptr) | |
93 | { | |
94 | #ifndef NO_SIGPIPE | |
95 | /* Restore the old signal handler. */ | |
96 | struct cleanup_arg *clarg = (struct cleanup_arg *) ptr; | |
97 | ||
98 | if (clarg != NULL && clarg->oldaction != NULL) | |
99 | __sigaction (SIGPIPE, clarg->oldaction, NULL); | |
100 | #endif | |
101 | ||
102 | /* Free the lock. */ | |
103 | __libc_lock_unlock (syslog_lock); | |
104 | } | |
105 | ||
106 | ||
107 | /* | |
108 | * syslog, vsyslog -- | |
109 | * print message on log file; output is intended for syslogd(8). | |
110 | */ | |
111 | void | |
c6251f03 | 112 | __syslog(int pri, const char *fmt, ...) |
790aa1f2 UD |
113 | { |
114 | va_list ap; | |
115 | ||
790aa1f2 | 116 | va_start(ap, fmt); |
29c21e49 | 117 | __vsyslog_chk(pri, -1, fmt, ap); |
790aa1f2 UD |
118 | va_end(ap); |
119 | } | |
c6251f03 RM |
120 | ldbl_hidden_def (__syslog, syslog) |
121 | ldbl_strong_alias (__syslog, syslog) | |
790aa1f2 UD |
122 | |
123 | void | |
29c21e49 UD |
124 | __syslog_chk(int pri, int flag, const char *fmt, ...) |
125 | { | |
790aa1f2 | 126 | va_list ap; |
29c21e49 UD |
127 | |
128 | va_start(ap, fmt); | |
129 | __vsyslog_chk(pri, flag, fmt, ap); | |
130 | va_end(ap); | |
131 | } | |
132 | ||
133 | void | |
134 | __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap) | |
790aa1f2 UD |
135 | { |
136 | struct tm now_tm; | |
137 | time_t now; | |
138 | int fd; | |
139 | FILE *f; | |
140 | char *buf = 0; | |
141 | size_t bufsize = 0; | |
5615eaf2 | 142 | size_t msgoff; |
790aa1f2 UD |
143 | #ifndef NO_SIGPIPE |
144 | struct sigaction action, oldaction; | |
145 | int sigpipe; | |
146 | #endif | |
147 | int saved_errno = errno; | |
148 | char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"]; | |
149 | ||
150 | #define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID | |
151 | /* Check for invalid bits. */ | |
152 | if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) { | |
153 | syslog(INTERNALLOG, | |
154 | "syslog: unknown facility/priority: %x", pri); | |
155 | pri &= LOG_PRIMASK|LOG_FACMASK; | |
156 | } | |
157 | ||
158 | /* Check priority against setlogmask values. */ | |
159 | if ((LOG_MASK (LOG_PRI (pri)) & LogMask) == 0) | |
160 | return; | |
161 | ||
162 | /* Set default facility if none specified. */ | |
163 | if ((pri & LOG_FACMASK) == 0) | |
164 | pri |= LogFacility; | |
165 | ||
166 | /* Build the message in a memory-buffer stream. */ | |
711f67a7 | 167 | f = __open_memstream (&buf, &bufsize); |
790aa1f2 UD |
168 | if (f == NULL) |
169 | { | |
170 | /* We cannot get a stream. There is not much we can do but | |
171 | emitting an error messages. */ | |
172 | char numbuf[3 * sizeof (pid_t)]; | |
173 | char *nump; | |
174 | char *endp = __stpcpy (failbuf, "out of memory ["); | |
175 | pid_t pid = __getpid (); | |
176 | ||
177 | nump = numbuf + sizeof (numbuf); | |
178 | /* The PID can never be zero. */ | |
179 | do | |
180 | *--nump = '0' + pid % 10; | |
181 | while ((pid /= 10) != 0); | |
182 | ||
183 | endp = __mempcpy (endp, nump, (numbuf + sizeof (numbuf)) - nump); | |
184 | *endp++ = ']'; | |
185 | *endp = '\0'; | |
186 | buf = failbuf; | |
187 | bufsize = endp - failbuf; | |
188 | msgoff = 0; | |
189 | } | |
190 | else | |
191 | { | |
192 | __fsetlocking (f, FSETLOCKING_BYCALLER); | |
5615eaf2 | 193 | fprintf (f, "<%d>", pri); |
790aa1f2 UD |
194 | (void) time (&now); |
195 | f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr, | |
196 | f->_IO_write_end | |
197 | - f->_IO_write_ptr, | |
198 | "%h %e %T ", | |
199 | __localtime_r (&now, &now_tm), | |
4b5b009c | 200 | _nl_C_locobj_ptr); |
790aa1f2 UD |
201 | msgoff = ftell (f); |
202 | if (LogTag == NULL) | |
203 | LogTag = __progname; | |
204 | if (LogTag != NULL) | |
3164bf09 | 205 | __fputs_unlocked (LogTag, f); |
790aa1f2 UD |
206 | if (LogStat & LOG_PID) |
207 | fprintf (f, "[%d]", (int) __getpid ()); | |
208 | if (LogTag != NULL) | |
209 | { | |
039c721a JM |
210 | __putc_unlocked (':', f); |
211 | __putc_unlocked (' ', f); | |
790aa1f2 UD |
212 | } |
213 | ||
214 | /* Restore errno for %m format. */ | |
215 | __set_errno (saved_errno); | |
216 | ||
217 | /* We have the header. Print the user's format into the | |
218 | buffer. */ | |
29c21e49 UD |
219 | if (flag == -1) |
220 | vfprintf (f, fmt, ap); | |
221 | else | |
222 | __vfprintf_chk (f, flag, fmt, ap); | |
790aa1f2 UD |
223 | |
224 | /* Close the memory stream; this will finalize the data | |
225 | into a malloc'd buffer in BUF. */ | |
226 | fclose (f); | |
227 | } | |
228 | ||
229 | /* Output to stderr if requested. */ | |
230 | if (LogStat & LOG_PERROR) { | |
231 | struct iovec iov[2]; | |
2e09a79a | 232 | struct iovec *v = iov; |
790aa1f2 UD |
233 | |
234 | v->iov_base = buf + msgoff; | |
235 | v->iov_len = bufsize - msgoff; | |
236 | /* Append a newline if necessary. */ | |
237 | if (buf[bufsize - 1] != '\n') | |
238 | { | |
239 | ++v; | |
240 | v->iov_base = (char *) "\n"; | |
241 | v->iov_len = 1; | |
242 | } | |
243 | ||
244 | __libc_cleanup_push (free, buf == failbuf ? NULL : buf); | |
245 | ||
246 | /* writev is a cancellation point. */ | |
247 | (void)__writev(STDERR_FILENO, iov, v - iov + 1); | |
248 | ||
249 | __libc_cleanup_pop (0); | |
250 | } | |
251 | ||
252 | /* Prepare for multiple users. We have to take care: open and | |
253 | write are cancellation points. */ | |
254 | struct cleanup_arg clarg; | |
255 | clarg.buf = buf; | |
256 | clarg.oldaction = NULL; | |
257 | __libc_cleanup_push (cancel_handler, &clarg); | |
258 | __libc_lock_lock (syslog_lock); | |
259 | ||
260 | #ifndef NO_SIGPIPE | |
261 | /* Prepare for a broken connection. */ | |
262 | memset (&action, 0, sizeof (action)); | |
263 | action.sa_handler = sigpipe_handler; | |
264 | sigemptyset (&action.sa_mask); | |
265 | sigpipe = __sigaction (SIGPIPE, &action, &oldaction); | |
266 | if (sigpipe == 0) | |
267 | clarg.oldaction = &oldaction; | |
268 | #endif | |
269 | ||
270 | /* Get connected, output the message to the local logger. */ | |
271 | if (!connected) | |
272 | openlog_internal(LogTag, LogStat | LOG_NDELAY, 0); | |
273 | ||
274 | /* If we have a SOCK_STREAM connection, also send ASCII NUL as | |
275 | a record terminator. */ | |
276 | if (LogType == SOCK_STREAM) | |
277 | ++bufsize; | |
278 | ||
279 | if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) | |
280 | { | |
281 | if (connected) | |
282 | { | |
283 | /* Try to reopen the syslog connection. Maybe it went | |
284 | down. */ | |
285 | closelog_internal (); | |
286 | openlog_internal(LogTag, LogStat | LOG_NDELAY, 0); | |
287 | } | |
288 | ||
289 | if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) | |
290 | { | |
291 | closelog_internal (); /* attempt re-open next time */ | |
292 | /* | |
293 | * Output the message to the console; don't worry | |
294 | * about blocking, if console blocks everything will. | |
295 | * Make sure the error reported is the one from the | |
296 | * syslogd failure. | |
297 | */ | |
298 | if (LogStat & LOG_CONS && | |
299 | (fd = __open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY, 0)) >= 0) | |
300 | { | |
be7dc2b7 | 301 | __dprintf (fd, "%s\r\n", buf + msgoff); |
790aa1f2 UD |
302 | (void)__close(fd); |
303 | } | |
304 | } | |
305 | } | |
306 | ||
307 | #ifndef NO_SIGPIPE | |
308 | if (sigpipe == 0) | |
309 | __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL); | |
310 | #endif | |
311 | ||
312 | /* End of critical section. */ | |
313 | __libc_cleanup_pop (0); | |
314 | __libc_lock_unlock (syslog_lock); | |
315 | ||
316 | if (buf != failbuf) | |
317 | free (buf); | |
318 | } | |
29c21e49 UD |
319 | libc_hidden_def (__vsyslog_chk) |
320 | ||
321 | void | |
c6251f03 | 322 | __vsyslog(int pri, const char *fmt, va_list ap) |
29c21e49 UD |
323 | { |
324 | __vsyslog_chk (pri, -1, fmt, ap); | |
325 | } | |
c6251f03 | 326 | ldbl_hidden_def (__vsyslog, vsyslog) |
a97e5e25 | 327 | ldbl_weak_alias (__vsyslog, vsyslog) |
790aa1f2 | 328 | |
7ab7969c | 329 | static struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */ |
790aa1f2 UD |
330 | |
331 | ||
332 | static void | |
790aa1f2 UD |
333 | openlog_internal(const char *ident, int logstat, int logfac) |
334 | { | |
335 | if (ident != NULL) | |
336 | LogTag = ident; | |
337 | LogStat = logstat; | |
338 | if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0) | |
339 | LogFacility = logfac; | |
340 | ||
341 | int retry = 0; | |
342 | while (retry < 2) { | |
343 | if (LogFile == -1) { | |
7ab7969c UD |
344 | SyslogAddr.sun_family = AF_UNIX; |
345 | (void)strncpy(SyslogAddr.sun_path, _PATH_LOG, | |
346 | sizeof(SyslogAddr.sun_path)); | |
790aa1f2 | 347 | if (LogStat & LOG_NDELAY) { |
52fb79d6 FW |
348 | LogFile = __socket(AF_UNIX, LogType | SOCK_CLOEXEC, 0); |
349 | if (LogFile == -1) | |
350 | return; | |
790aa1f2 UD |
351 | } |
352 | } | |
353 | if (LogFile != -1 && !connected) | |
354 | { | |
355 | int old_errno = errno; | |
356 | if (__connect(LogFile, &SyslogAddr, sizeof(SyslogAddr)) | |
357 | == -1) | |
358 | { | |
359 | int saved_errno = errno; | |
360 | int fd = LogFile; | |
361 | LogFile = -1; | |
362 | (void)__close(fd); | |
363 | __set_errno (old_errno); | |
364 | if (saved_errno == EPROTOTYPE) | |
365 | { | |
366 | /* retry with the other type: */ | |
367 | LogType = (LogType == SOCK_DGRAM | |
368 | ? SOCK_STREAM : SOCK_DGRAM); | |
369 | ++retry; | |
370 | continue; | |
371 | } | |
372 | } else | |
373 | connected = 1; | |
374 | } | |
375 | break; | |
376 | } | |
377 | } | |
378 | ||
379 | void | |
380 | openlog (const char *ident, int logstat, int logfac) | |
381 | { | |
382 | /* Protect against multiple users and cancellation. */ | |
383 | __libc_cleanup_push (cancel_handler, NULL); | |
384 | __libc_lock_lock (syslog_lock); | |
385 | ||
386 | openlog_internal (ident, logstat, logfac); | |
387 | ||
388 | __libc_cleanup_pop (1); | |
389 | } | |
390 | ||
391 | #ifndef NO_SIGPIPE | |
392 | static void | |
393 | sigpipe_handler (int signo) | |
394 | { | |
395 | closelog_internal (); | |
396 | } | |
397 | #endif | |
398 | ||
399 | static void | |
60d2f8f3 | 400 | closelog_internal (void) |
790aa1f2 UD |
401 | { |
402 | if (!connected) | |
403 | return; | |
404 | ||
405 | __close (LogFile); | |
406 | LogFile = -1; | |
407 | connected = 0; | |
408 | } | |
409 | ||
410 | void | |
60d2f8f3 | 411 | closelog (void) |
790aa1f2 UD |
412 | { |
413 | /* Protect against multiple users and cancellation. */ | |
414 | __libc_cleanup_push (cancel_handler, NULL); | |
415 | __libc_lock_lock (syslog_lock); | |
416 | ||
417 | closelog_internal (); | |
418 | LogTag = NULL; | |
419 | LogType = SOCK_DGRAM; /* this is the default */ | |
420 | ||
421 | /* Free the lock. */ | |
422 | __libc_cleanup_pop (1); | |
423 | } | |
424 | ||
425 | /* setlogmask -- set the log mask level */ | |
426 | int | |
9d46370c | 427 | setlogmask (int pmask) |
790aa1f2 UD |
428 | { |
429 | int omask; | |
430 | ||
431 | omask = LogMask; | |
432 | if (pmask != 0) | |
433 | LogMask = pmask; | |
434 | return (omask); | |
435 | } |