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