1 /*
2 * Copyright (c) 2015, Juniper Networks, Inc.
3 * All rights reserved.
4 * This SOFTWARE is licensed under the LICENSE provided in the
5 * ../Copyright file. By downloading, installing, copying, or otherwise
6 * using the SOFTWARE, you agree to be bound by the terms of that
7 * LICENSE.
8 * Phil Shafer, June 2015
9 */
10
11 /*
12 * Portions of this file are:
13 * Copyright (c) 1983, 1988, 1993
14 * The Regents of the University of California. All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <sys/cdefs.h>
42 #include <sys/types.h>
43 #include <sys/socket.h>
44 #include <sys/syslog.h>
45 #include <sys/uio.h>
46 #include <sys/un.h>
47 #include <netdb.h>
48 #include <errno.h>
49 #include <fcntl.h>
50 #include <paths.h>
51 #include <pthread.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <time.h>
56 #include <limits.h>
57 #include <unistd.h>
58 #include <stdarg.h>
59 #include <sys/time.h>
60 #include <sys/types.h>
61 #include <sys/sysctl.h>
62
63 #include "xo_config.h"
64 #include "xo.h"
65 #include "xo_encoder.h" /* For xo_realloc */
66 #include "xo_buf.h"
67
68 /*
69 * SYSLOG (RFC 5424) requires an enterprise identifier. This turns
70 * out to be a fickle little issue. For a single-vendor box, the
71 * system should have a single EID that all software can use. When
72 * VendorX turns FreeBSD into a product, all software (kernel and
73 * utilities) should report VendorX's EID. But when software is
74 * installed on top of an external operating system, the application
75 * should report it's own EID, distinct from the base OS.
76 *
77 * To make this happen, the kernel should support a sysctl to assign a
78 * custom enterprise-id ("kern.syslog.enterprise_id"). libxo then
79 * allows an application to set a custom EID to override that system
80 * wide value, if needed.
81 *
82 * We try to set the stock IANA assigned Enterprise ID value for the
83 * vendors we know about (FreeBSD, macosx), but fallback to the
84 * "example" EID defined by IANA. See:
85 * https://www.iana.org/assignments/enterprise-numbers/enterprise-numbers
86 */
87
88 #define XO_SYSLOG_ENTERPRISE_ID "kern.syslog.enterprise_id"
89
90 #if defined(__FreeBSD__)
91 #define XO_DEFAULT_EID 2238
92 #elif defined(__macosx__)
93 #define XO_DEFAULT_EID 63
94 #else
95 #define XO_DEFAULT_EID 32473 /* Fallback to the "example" number */
96 #endif
97
98 #ifndef HOST_NAME_MAX
99 #ifdef _SC_HOST_NAME_MAX
100 #define HOST_NAME_MAX _SC_HOST_NAME_MAX
101 #else
102 #define HOST_NAME_MAX 255
103 #endif /* _SC_HOST_NAME_MAX */
104 #endif /* HOST_NAME_MAX */
105
106 #ifndef UNUSED
107 #define UNUSED __attribute__ ((__unused__))
108 #endif /* UNUSED */
109
110 static int xo_logfile = -1; /* fd for log */
111 static int xo_status; /* connection xo_status */
112 static int xo_opened; /* have done openlog() */
113 static int xo_logstat = 0; /* xo_status bits, set by openlog() */
114 static const char *xo_logtag = NULL; /* string to tag the entry with */
115 static int xo_logfacility = LOG_USER; /* default facility code */
116 static int xo_logmask = 0xff; /* mask of priorities to be logged */
117 static pthread_mutex_t xo_syslog_mutex UNUSED = PTHREAD_MUTEX_INITIALIZER;
118 static int xo_unit_test; /* Fake data for unit test */
119
120 #define REAL_VOID(_x) \
121 do { int really_ignored = _x; if (really_ignored) { }} while (0)
122
123 #if !defined(HAVE_DECL___ISTHREADED) || !HAVE_DECL___ISTHREADED
124 #define __isthreaded 1
125 #endif
126
127 #define THREAD_LOCK() \
128 do { \
129 if (__isthreaded) pthread_mutex_lock(&xo_syslog_mutex); \
130 } while(0)
131 #define THREAD_UNLOCK() \
132 do { \
133 if (__isthreaded) pthread_mutex_unlock(&xo_syslog_mutex); \
134 } while(0)
135
136 static void xo_disconnect_log(void); /* disconnect from syslogd */
137 static void xo_connect_log(void); /* (re)connect to syslogd */
138 static void xo_open_log_unlocked(const char *, int, int);
139
140 enum {
141 NOCONN = 0,
142 CONNDEF,
143 CONNPRIV,
144 };
145
146 static xo_syslog_open_t xo_syslog_open;
147 static xo_syslog_send_t xo_syslog_send;
148 static xo_syslog_close_t xo_syslog_close;
149
150 static char xo_syslog_enterprise_id[12];
151
152 /*
153 * Record an enterprise ID, which functions as a namespace for syslog
154 * messages. The value is pre-formatted into a string. This allows
155 * applications to customize their syslog message set, when needed.
156 */
157 void
xo_set_syslog_enterprise_id(unsigned short eid)158 xo_set_syslog_enterprise_id (unsigned short eid)
159 {
160 snprintf(xo_syslog_enterprise_id, sizeof(xo_syslog_enterprise_id),
161 "%u", eid);
162 }
163
164 /*
165 * Handle the work of transmitting the syslog message
166 */
167 static void
xo_send_syslog(char * full_msg,char * v0_hdr,char * text_only)168 xo_send_syslog (char *full_msg, char *v0_hdr,
169 char *text_only)
170 {
171 if (xo_syslog_send) {
172 xo_syslog_send(full_msg, v0_hdr, text_only);
173 return;
174 }
175
176 int fd;
177 int full_len = strlen(full_msg);
178
179 /* Output to stderr if requested, then we've been passed a v0 header */
180 if (v0_hdr) {
181 struct iovec iov[3];
182 struct iovec *v = iov;
183 char newline[] = "\n";
184
185 v->iov_base = v0_hdr;
186 v->iov_len = strlen(v0_hdr);
187 v += 1;
188 v->iov_base = text_only;
189 v->iov_len = strlen(text_only);
190 v += 1;
191 v->iov_base = newline;
192 v->iov_len = 1;
193 v += 1;
194 REAL_VOID(writev(STDERR_FILENO, iov, 3));
195 }
196
197 /* Get connected, output the message to the local logger. */
198 if (!xo_opened)
199 xo_open_log_unlocked(xo_logtag, xo_logstat | LOG_NDELAY, 0);
200 xo_connect_log();
201
202 /*
203 * If the send() fails, there are two likely scenarios:
204 * 1) syslogd was restarted
205 * 2) /var/run/log is out of socket buffer space, which
206 * in most cases means local DoS.
207 * If the error does not indicate a full buffer, we address
208 * case #1 by attempting to reconnect to /var/run/log[priv]
209 * and resending the message once.
210 *
211 * If we are working with a privileged socket, the retry
212 * attempts end there, because we don't want to freeze a
213 * critical application like su(1) or sshd(8).
214 *
215 * Otherwise, we address case #2 by repeatedly retrying the
216 * send() to give syslogd a chance to empty its socket buffer.
217 */
218
219 if (send(xo_logfile, full_msg, full_len, 0) < 0) {
220 if (errno != ENOBUFS) {
221 /*
222 * Scenario 1: syslogd was restarted
223 * reconnect and resend once
224 */
225 xo_disconnect_log();
226 xo_connect_log();
227 if (send(xo_logfile, full_msg, full_len, 0) >= 0) {
228 return;
229 }
230 /*
231 * if the resend failed, fall through to
232 * possible scenario 2
233 */
234 }
235 while (errno == ENOBUFS) {
236 /*
237 * Scenario 2: out of socket buffer space
238 * possible DoS, fail fast on a privileged
239 * socket
240 */
241 if (xo_status == CONNPRIV)
242 break;
243 usleep(1);
244 if (send(xo_logfile, full_msg, full_len, 0) >= 0) {
245 return;
246 }
247 }
248 } else {
249 return;
250 }
251
252 /*
253 * Output the message to the console; try not to block
254 * as a blocking console should not stop other processes.
255 * Make sure the error reported is the one from the syslogd failure.
256 */
257 int flags = O_WRONLY | O_NONBLOCK;
258 #ifdef O_CLOEXEC
259 flags |= O_CLOEXEC;
260 #endif /* O_CLOEXEC */
261
262 if (xo_logstat & LOG_CONS
263 && (fd = open(_PATH_CONSOLE, flags, 0)) >= 0) {
264 struct iovec iov[2];
265 struct iovec *v = iov;
266 char crnl[] = "\r\n";
267 char *p;
268
269 p = strchr(full_msg, '>') + 1;
270 v->iov_base = p;
271 v->iov_len = full_len - (p - full_msg);
272 ++v;
273 v->iov_base = crnl;
274 v->iov_len = 2;
275 REAL_VOID(writev(fd, iov, 2));
276 (void) close(fd);
277 }
278 }
279
280 /* Should be called with mutex acquired */
281 static void
xo_disconnect_log(void)282 xo_disconnect_log (void)
283 {
284 if (xo_syslog_close) {
285 xo_syslog_close();
286 return;
287 }
288
289 /*
290 * If the user closed the FD and opened another in the same slot,
291 * that's their problem. They should close it before calling on
292 * system services.
293 */
294 if (xo_logfile != -1) {
295 close(xo_logfile);
296 xo_logfile = -1;
297 }
298 xo_status = NOCONN; /* retry connect */
299 }
300
301 /* Should be called with mutex acquired */
302 static void
xo_connect_log(void)303 xo_connect_log (void)
304 {
305 if (xo_syslog_open) {
306 xo_syslog_open();
307 return;
308 }
309
310 struct sockaddr_un saddr; /* AF_UNIX address of local logger */
311
312 if (xo_logfile == -1) {
313 int flags = SOCK_DGRAM;
314 #ifdef SOCK_CLOEXEC
315 flags |= SOCK_CLOEXEC;
316 #endif /* SOCK_CLOEXEC */
317 if ((xo_logfile = socket(AF_UNIX, flags, 0)) == -1)
318 return;
319 }
320 if (xo_logfile != -1 && xo_status == NOCONN) {
321 #ifdef HAVE_SUN_LEN
322 saddr.sun_len = sizeof(saddr);
323 #endif /* HAVE_SUN_LEN */
324 saddr.sun_family = AF_UNIX;
325
326 /*
327 * First try privileged socket. If no success,
328 * then try default socket.
329 */
330
331 #ifdef _PATH_LOG_PRIV
332 (void) strncpy(saddr.sun_path, _PATH_LOG_PRIV,
333 sizeof saddr.sun_path);
334 if (connect(xo_logfile, (struct sockaddr *) &saddr,
335 sizeof(saddr)) != -1)
336 xo_status = CONNPRIV;
337 #endif /* _PATH_LOG_PRIV */
338
339 #ifdef _PATH_LOG
340 if (xo_status == NOCONN) {
341 (void) strncpy(saddr.sun_path, _PATH_LOG,
342 sizeof saddr.sun_path);
343 if (connect(xo_logfile, (struct sockaddr *)&saddr,
344 sizeof(saddr)) != -1)
345 xo_status = CONNDEF;
346 }
347 #endif /* _PATH_LOG */
348
349 #ifdef _PATH_OLDLOG
350 if (xo_status == NOCONN) {
351 /*
352 * Try the old "/dev/log" path, for backward
353 * compatibility.
354 */
355 (void) strncpy(saddr.sun_path, _PATH_OLDLOG,
356 sizeof saddr.sun_path);
357 if (connect(xo_logfile, (struct sockaddr *)&saddr,
358 sizeof(saddr)) != -1)
359 xo_status = CONNDEF;
360 }
361 #endif /* _PATH_OLDLOG */
362
363 if (xo_status == NOCONN) {
364 (void) close(xo_logfile);
365 xo_logfile = -1;
366 }
367 }
368 }
369
370 static void
xo_open_log_unlocked(const char * ident,int logstat,int logfac)371 xo_open_log_unlocked (const char *ident, int logstat, int logfac)
372 {
373 if (ident != NULL)
374 xo_logtag = ident;
375 xo_logstat = logstat;
376 if (logfac != 0 && (logfac &~ LOG_FACMASK) == 0)
377 xo_logfacility = logfac;
378
379 if (xo_logstat & LOG_NDELAY) /* open immediately */
380 xo_connect_log();
381
382 xo_opened = 1; /* ident and facility has been set */
383 }
384
385 void
xo_open_log(const char * ident,int logstat,int logfac)386 xo_open_log (const char *ident, int logstat, int logfac)
387 {
388 THREAD_LOCK();
389 xo_open_log_unlocked(ident, logstat, logfac);
390 THREAD_UNLOCK();
391 }
392
393
394 void
xo_close_log(void)395 xo_close_log (void)
396 {
397 THREAD_LOCK();
398 if (xo_logfile != -1) {
399 (void) close(xo_logfile);
400 xo_logfile = -1;
401 }
402 xo_logtag = NULL;
403 xo_status = NOCONN;
404 THREAD_UNLOCK();
405 }
406
407 /* xo_set_logmask -- set the log mask level */
408 int
xo_set_logmask(int pmask)409 xo_set_logmask (int pmask)
410 {
411 int omask;
412
413 THREAD_LOCK();
414 omask = xo_logmask;
415 if (pmask != 0)
416 xo_logmask = pmask;
417 THREAD_UNLOCK();
418 return (omask);
419 }
420
421 void
xo_set_syslog_handler(xo_syslog_open_t open_func,xo_syslog_send_t send_func,xo_syslog_close_t close_func)422 xo_set_syslog_handler (xo_syslog_open_t open_func,
423 xo_syslog_send_t send_func,
424 xo_syslog_close_t close_func)
425 {
426 xo_syslog_open = open_func;
427 xo_syslog_send = send_func;
428 xo_syslog_close = close_func;
429 }
430
431 static ssize_t
xo_snprintf(char * out,ssize_t outsize,const char * fmt,...)432 xo_snprintf (char *out, ssize_t outsize, const char *fmt, ...)
433 {
434 ssize_t status;
435 ssize_t retval = 0;
436 va_list ap;
437
438 if (out && outsize) {
439 va_start(ap, fmt);
440 status = vsnprintf(out, outsize, fmt, ap);
441 if (status < 0) { /* this should never happen, */
442 *out = 0; /* handle it in the safest way possible if it does */
443 retval = 0;
444 } else {
445 retval = status;
446 retval = retval > outsize ? outsize : retval;
447 }
448 va_end(ap);
449 }
450
451 return retval;
452 }
453
454 static xo_ssize_t
xo_syslog_handle_write(void * opaque,const char * data)455 xo_syslog_handle_write (void *opaque, const char *data)
456 {
457 xo_buffer_t *xbp = opaque;
458 int len = strlen(data);
459 int left = xo_buf_left(xbp);
460
461 if (len > left - 1)
462 len = left - 1;
463
464 memcpy(xbp->xb_curp, data, len);
465 xbp->xb_curp += len;
466 *xbp->xb_curp = '\0';
467
468 return len;
469 }
470
471 static void
xo_syslog_handle_close(void * opaque UNUSED)472 xo_syslog_handle_close (void *opaque UNUSED)
473 {
474 }
475
476 static int
xo_syslog_handle_flush(void * opaque UNUSED)477 xo_syslog_handle_flush (void *opaque UNUSED)
478 {
479 return 0;
480 }
481
482 void
xo_set_unit_test_mode(int value)483 xo_set_unit_test_mode (int value)
484 {
485 xo_unit_test = value;
486 }
487
488 void
xo_vsyslog(int pri,const char * name,const char * fmt,va_list vap)489 xo_vsyslog (int pri, const char *name, const char *fmt, va_list vap)
490 {
491 int saved_errno = errno;
492 char tbuf[2048];
493 char *tp = NULL, *ep = NULL;
494 unsigned start_of_msg = 0;
495 char *v0_hdr = NULL;
496 xo_buffer_t xb;
497 static pid_t my_pid;
498 unsigned log_offset;
499
500 if (my_pid == 0)
501 my_pid = xo_unit_test ? 222 : getpid();
502
503 /* Check for invalid bits */
504 if (pri & ~(LOG_PRIMASK|LOG_FACMASK)) {
505 xo_syslog(LOG_ERR | LOG_CONS | LOG_PERROR | LOG_PID,
506 "syslog-unknown-priority",
507 "syslog: unknown facility/priority: %#x", pri);
508 pri &= LOG_PRIMASK|LOG_FACMASK;
509 }
510
511 THREAD_LOCK();
512
513 /* Check priority against setlogmask values. */
514 if (!(LOG_MASK(LOG_PRI(pri)) & xo_logmask)) {
515 THREAD_UNLOCK();
516 return;
517 }
518
519 /* Set default facility if none specified. */
520 if ((pri & LOG_FACMASK) == 0)
521 pri |= xo_logfacility;
522
523 /* Create the primary stdio hook */
524 xb.xb_bufp = tbuf;
525 xb.xb_curp = tbuf;
526 xb.xb_size = sizeof(tbuf);
527
528 xo_handle_t *xop = xo_create(XO_STYLE_SDPARAMS, 0);
529 if (xop == NULL) {
530 THREAD_UNLOCK();
531 return;
532 }
533
534 #ifdef HAVE_GETPROGNAME
535 if (xo_logtag == NULL)
536 xo_logtag = getprogname();
537 #endif /* HAVE_GETPROGNAME */
538
539 xo_set_writer(xop, &xb, xo_syslog_handle_write, xo_syslog_handle_close,
540 xo_syslog_handle_flush);
541
542 /* Build the message; start by getting the time */
543 struct tm tm;
544 struct timeval tv;
545
546 /* Unit test hack: fake a fixed time */
547 if (xo_unit_test) {
548 tv.tv_sec = 1435085229;
549 tv.tv_usec = 123456;
550 } else
551 gettimeofday(&tv, NULL);
552
553 (void) localtime_r(&tv.tv_sec, &tm);
554
555 if (xo_logstat & LOG_PERROR) {
556 /*
557 * For backwards compatibility, we need to make the old-style
558 * message. This message can be emitted to the console/tty.
559 */
560 v0_hdr = alloca(2048);
561 tp = v0_hdr;
562 ep = v0_hdr + 2048;
563
564 if (xo_logtag != NULL)
565 tp += xo_snprintf(tp, ep - tp, "%s", xo_logtag);
566 if (xo_logstat & LOG_PID)
567 tp += xo_snprintf(tp, ep - tp, "[%d]", my_pid);
568 if (xo_logtag)
569 tp += xo_snprintf(tp, ep - tp, ": ");
570 }
571
572 log_offset = xb.xb_curp - xb.xb_bufp;
573
574 /* Add PRI, PRIVAL, and VERSION */
575 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "<%d>1 ", pri);
576
577 /* Add TIMESTAMP with milliseconds and TZOFFSET */
578 xb.xb_curp += strftime(xb.xb_curp, xo_buf_left(&xb), "%FT%T", &tm);
579 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb),
580 ".%03.3u", tv.tv_usec / 1000);
581 xb.xb_curp += strftime(xb.xb_curp, xo_buf_left(&xb), "%z ", &tm);
582
583 /*
584 * Add HOSTNAME; we rely on gethostname and don't fluff with
585 * ip addresses. Might need to revisit.....
586 */
587 char hostname[HOST_NAME_MAX];
588 hostname[0] = '\0';
589 if (xo_unit_test)
590 strcpy(hostname, "worker-host");
591 else
592 (void) gethostname(hostname, sizeof(hostname));
593
594 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "%s ",
595 hostname[0] ? hostname : "-");
596
597 /* Add APP-NAME */
598 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "%s ",
599 xo_logtag ?: "-");
600
601 /* Add PROCID */
602 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "%d ", my_pid);
603
604 /*
605 * Add MSGID. The user should provide us with a name, which we
606 * prefix with the current enterprise ID, as learned from the kernel.
607 * If the kernel won't tell us, we use the stock/builtin number.
608 */
609 char *buf UNUSED = NULL;
610 const char *eid = xo_syslog_enterprise_id;
611 const char *at_sign = "@";
612
613 if (name == NULL) {
614 name = "-";
615 eid = at_sign = "";
616
617 } else if (*name == '@') {
618 /* Our convention is to prefix IANA-defined names with an "@" */
619 name += 1;
620 eid = at_sign = "";
621
622 } else if (eid[0] == '\0') {
623 #ifdef HAVE_SYSCTLBYNAME
624 /*
625 * See if the kernel knows the sysctl for the enterprise ID
626 */
627 size_t size = 0;
628 if (sysctlbyname(XO_SYSLOG_ENTERPRISE_ID, NULL, &size, NULL, 0) == 0
629 && size > 0) {
630 buf = alloca(size);
631 if (sysctlbyname(XO_SYSLOG_ENTERPRISE_ID, buf, &size, NULL, 0) == 0
632 && size > 0)
633 eid = buf;
634 }
635 #endif /* HAVE_SYSCTLBYNAME */
636
637 if (eid[0] == '\0') {
638 /* Fallback to our base default */
639 xo_set_syslog_enterprise_id(XO_DEFAULT_EID);
640 eid = xo_syslog_enterprise_id;
641 }
642 }
643
644 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "%s [%s%s%s ",
645 name, name, at_sign, eid);
646
647 /*
648 * Now for the real content. We make two distinct passes thru the
649 * xo_emit engine, first for the SD-PARAMS and then for the text
650 * message.
651 */
652 va_list ap;
653 va_copy(ap, vap);
654
655 errno = saved_errno; /* Restore saved error value */
656 xo_emit_hv(xop, fmt, ap);
657 xo_flush_h(xop);
658
659 va_end(ap);
660
661 /* Trim trailing space */
662 if (xb.xb_curp[-1] == ' ')
663 xb.xb_curp -= 1;
664
665 /* Close the structured data (SD-ELEMENT) */
666 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb), "] ");
667
668 /*
669 * Since our MSG is known to be UTF-8, we MUST prefix it with
670 * that most-annoying-of-all-UTF-8 features, the BOM (0xEF.BB.BF).
671 */
672 xb.xb_curp += xo_snprintf(xb.xb_curp, xo_buf_left(&xb),
673 "%c%c%c", 0xEF, 0xBB, 0xBF);
674
675 /* Save the start of the message */
676 if (xo_logstat & LOG_PERROR)
677 start_of_msg = xb.xb_curp - xb.xb_bufp;
678
679 xo_set_style(xop, XO_STYLE_TEXT);
680 xo_set_flags(xop, XOF_UTF8);
681
682 errno = saved_errno; /* Restore saved error value */
683 xo_emit_hv(xop, fmt, ap);
684 xo_flush_h(xop);
685
686 /* Remove a trailing newline */
687 if (xb.xb_curp[-1] == '\n')
688 *--xb.xb_curp = '\0';
689
690 if (xo_get_flags(xop) & XOF_LOG_SYSLOG)
691 fprintf(stderr, "xo: syslog: %s\n", xb.xb_bufp + log_offset);
692
693 xo_send_syslog(xb.xb_bufp, v0_hdr, xb.xb_bufp + start_of_msg);
694
695 xo_destroy(xop);
696
697 THREAD_UNLOCK();
698 }
699
700 /*
701 * syslog - print message on log file; output is intended for syslogd(8).
702 */
703 void
xo_syslog(int pri,const char * name,const char * fmt,...)704 xo_syslog (int pri, const char *name, const char *fmt, ...)
705 {
706 va_list ap;
707
708 va_start(ap, fmt);
709 xo_vsyslog(pri, name, fmt, ap);
710 va_end(ap);
711 }
712