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 * 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.
20 *
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.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
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35/*
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35static char sccsid[] = "@(#)syslog.c 8.5 (Berkeley) 4/29/95";
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37*/
38static const char rcsid[] =
39 "$FreeBSD: head/lib/libc/gen/syslog.c 89805 2002-01-25 21:49:34Z dwmalone $";
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36#endif /* LIBC_SCCS and not lint */
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37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/gen/syslog.c 90045 2002-02-01 01:32:19Z obrien $"); |
39
40#include "namespace.h"
41#include <sys/types.h>
42#include <sys/socket.h>
43#include <sys/syslog.h>
44#include <sys/uio.h>
45#include <sys/un.h>
46#include <netdb.h>
47
48#include <errno.h>
49#include <fcntl.h>
50#include <paths.h>
51#include <stdio.h>
52#include <string.h>
53#include <time.h>
54#include <unistd.h>
55
56#if __STDC__
57#include <stdarg.h>
58#else
59#include <varargs.h>
60#endif
61#include "un-namespace.h"
62
63static int LogFile = -1; /* fd for log */
64static int connected; /* have done connect */
65static int opened; /* have done openlog() */
66static int LogStat = 0; /* status bits, set by openlog() */
67static const char *LogTag = NULL; /* string to tag the entry with */
68static int LogFacility = LOG_USER; /* default facility code */
69static int LogMask = 0xff; /* mask of priorities to be logged */
70extern char *__progname; /* Program name, from crt0. */
71
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74static void disconnectlog __P((void)); /* disconnect from syslogd */
75static void connectlog __P((void)); /* (re)connect to syslogd */
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72static void disconnectlog(void); /* disconnect from syslogd */
73static void connectlog(void); /* (re)connect to syslogd */ |
74
75/*
76 * Format of the magic cookie passed through the stdio hook
77 */
78struct bufcookie {
79 char *base; /* start of buffer */
80 int left;
81};
82
83/*
84 * stdio write hook for writing to a static string buffer
85 * XXX: Maybe one day, dynamically allocate it so that the line length
86 * is `unlimited'.
87 */
88static
89int writehook(cookie, buf, len)
90 void *cookie; /* really [struct bufcookie *] */
91 char *buf; /* characters to copy */
92 int len; /* length to copy */
93{
94 struct bufcookie *h; /* private `handle' */
95
96 h = (struct bufcookie *)cookie;
97 if (len > h->left) {
98 /* clip in case of wraparound */
99 len = h->left;
100 }
101 if (len > 0) {
102 (void)memcpy(h->base, buf, len); /* `write' it. */
103 h->base += len;
104 h->left -= len;
105 }
106 return 0;
107}
108
109/*
110 * syslog, vsyslog --
111 * print message on log file; output is intended for syslogd(8).
112 */
113void
114#if __STDC__
115syslog(int pri, const char *fmt, ...)
116#else
117syslog(pri, fmt, va_alist)
118 int pri;
119 char *fmt;
120 va_dcl
121#endif
122{
123 va_list ap;
124
125#if __STDC__
126 va_start(ap, fmt);
127#else
128 va_start(ap);
129#endif
130 vsyslog(pri, fmt, ap);
131 va_end(ap);
132}
133
134void
135vsyslog(pri, fmt, ap)
136 int pri;
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139 register const char *fmt;
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| 137 const char *fmt; |
138 va_list ap;
139{
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142 register int cnt;
143 register char ch, *p;
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140 int cnt;
141 char ch, *p; |
142 time_t now;
143 int fd, saved_errno;
144 char *stdp, tbuf[2048], fmt_cpy[1024], timbuf[26];
145 FILE *fp, *fmt_fp;
146 struct bufcookie tbuf_cookie;
147 struct bufcookie fmt_cookie;
148
149#define INTERNALLOG LOG_ERR|LOG_CONS|LOG_PERROR|LOG_PID
150 /* Check for invalid bits. */
151 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
152 syslog(INTERNALLOG,
153 "syslog: unknown facility/priority: %x", pri);
154 pri &= LOG_PRIMASK|LOG_FACMASK;
155 }
156
157 /* Check priority against setlogmask values. */
158 if (!(LOG_MASK(LOG_PRI(pri)) & LogMask))
159 return;
160
161 saved_errno = errno;
162
163 /* Set default facility if none specified. */
164 if ((pri & LOG_FACMASK) == 0)
165 pri |= LogFacility;
166
167 /* Create the primary stdio hook */
168 tbuf_cookie.base = tbuf;
169 tbuf_cookie.left = sizeof(tbuf);
170 fp = fwopen(&tbuf_cookie, writehook);
171 if (fp == NULL)
172 return;
173
174 /* Build the message. */
175 (void)time(&now);
176 (void)fprintf(fp, "<%d>", pri);
177 (void)fprintf(fp, "%.15s ", ctime_r(&now, timbuf) + 4);
178 if (LogStat & LOG_PERROR) {
179 /* Transfer to string buffer */
180 (void)fflush(fp);
181 stdp = tbuf + (sizeof(tbuf) - tbuf_cookie.left);
182 }
183 if (LogTag == NULL)
184 LogTag = __progname;
185 if (LogTag != NULL)
186 (void)fprintf(fp, "%s", LogTag);
187 if (LogStat & LOG_PID)
188 (void)fprintf(fp, "[%d]", getpid());
189 if (LogTag != NULL) {
190 (void)fprintf(fp, ": ");
191 }
192
193 /* Check to see if we can skip expanding the %m */
194 if (strstr(fmt, "%m")) {
195
196 /* Create the second stdio hook */
197 fmt_cookie.base = fmt_cpy;
198 fmt_cookie.left = sizeof(fmt_cpy) - 1;
199 fmt_fp = fwopen(&fmt_cookie, writehook);
200 if (fmt_fp == NULL) {
201 fclose(fp);
202 return;
203 }
204
205 /* Substitute error message for %m. */
206 for ( ; (ch = *fmt); ++fmt)
207 if (ch == '%' && fmt[1] == 'm') {
208 ++fmt;
209 fputs(strerror(saved_errno), fmt_fp);
210 } else
211 fputc(ch, fmt_fp);
212
213 /* Null terminate if room */
214 fputc(0, fmt_fp);
215 fclose(fmt_fp);
216
217 /* Guarantee null termination */
218 fmt_cpy[sizeof(fmt_cpy) - 1] = '\0';
219
220 fmt = fmt_cpy;
221 }
222
223 (void)vfprintf(fp, fmt, ap);
224 (void)fclose(fp);
225
226 cnt = sizeof(tbuf) - tbuf_cookie.left;
227
228 /* Output to stderr if requested. */
229 if (LogStat & LOG_PERROR) {
230 struct iovec iov[2];
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233 register struct iovec *v = iov;
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| 231 struct iovec *v = iov; |
232
233 v->iov_base = stdp;
234 v->iov_len = cnt - (stdp - tbuf);
235 ++v;
236 v->iov_base = "\n";
237 v->iov_len = 1;
238 (void)_writev(STDERR_FILENO, iov, 2);
239 }
240
241 /* Get connected, output the message to the local logger. */
242 if (!opened)
243 openlog(LogTag, LogStat | LOG_NDELAY, 0);
244 connectlog();
245 if (send(LogFile, tbuf, cnt, 0) >= 0)
246 return;
247
248 /*
249 * If the send() failed, the odds are syslogd was restarted.
250 * Make one (only) attempt to reconnect to /dev/log.
251 */
252 disconnectlog();
253 connectlog();
254 if (send(LogFile, tbuf, cnt, 0) >= 0)
255 return;
256
257 /*
258 * Output the message to the console; don't worry about blocking,
259 * if console blocks everything will. Make sure the error reported
260 * is the one from the syslogd failure.
261 */
262 if (LogStat & LOG_CONS &&
263 (fd = _open(_PATH_CONSOLE, O_WRONLY, 0)) >= 0) {
264 struct iovec iov[2];
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267 register struct iovec *v = iov;
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| 265 struct iovec *v = iov; |
266
267 p = strchr(tbuf, '>') + 1;
268 v->iov_base = p;
269 v->iov_len = cnt - (p - tbuf);
270 ++v;
271 v->iov_base = "\r\n";
272 v->iov_len = 2;
273 (void)_writev(fd, iov, 2);
274 (void)_close(fd);
275 }
276}
277static void
278disconnectlog()
279{
280 /*
281 * If the user closed the FD and opened another in the same slot,
282 * that's their problem. They should close it before calling on
283 * system services.
284 */
285 if (LogFile != -1) {
286 _close(LogFile);
287 LogFile = -1;
288 }
289 connected = 0; /* retry connect */
290}
291
292static void
293connectlog()
294{
295 struct sockaddr_un SyslogAddr; /* AF_UNIX address of local logger */
296
297 if (LogFile == -1) {
298 if ((LogFile = _socket(AF_UNIX, SOCK_DGRAM, 0)) == -1)
299 return;
300 (void)_fcntl(LogFile, F_SETFD, 1);
301 }
302 if (LogFile != -1 && !connected) {
303 SyslogAddr.sun_len = sizeof(SyslogAddr);
304 SyslogAddr.sun_family = AF_UNIX;
305 (void)strncpy(SyslogAddr.sun_path, _PATH_LOG,
306 sizeof SyslogAddr.sun_path);
307 connected = _connect(LogFile, (struct sockaddr *)&SyslogAddr,
308 sizeof(SyslogAddr)) != -1;
309
310 if (!connected) {
311 /*
312 * Try the old "/dev/log" path, for backward
313 * compatibility.
314 */
315 (void)strncpy(SyslogAddr.sun_path, _PATH_OLDLOG,
316 sizeof SyslogAddr.sun_path);
317 connected = _connect(LogFile,
318 (struct sockaddr *)&SyslogAddr,
319 sizeof(SyslogAddr)) != -1;
320 }
321
322 if (!connected) {
323 (void)_close(LogFile);
324 LogFile = -1;
325 }
326 }
327}
328
329void
330openlog(ident, logstat, logfac)
331 const char *ident;
332 int logstat, logfac;
333{
334 if (ident != NULL)
335 LogTag = ident;
336 LogStat = logstat;
337 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
338 LogFacility = logfac;
339
340 if (LogStat & LOG_NDELAY) /* open immediately */
341 connectlog();
342
343 opened = 1; /* ident and facility has been set */
344}
345
346void
347closelog()
348{
349 (void)_close(LogFile);
350 LogFile = -1;
351 connected = 0;
352}
353
354/* setlogmask -- set the log mask level */
355int
356setlogmask(pmask)
357 int pmask;
358{
359 int omask;
360
361 omask = LogMask;
362 if (pmask != 0)
363 LogMask = pmask;
364 return (omask);
365}
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