1 /* $OpenBSD: log.c,v 1.59 2021/05/07 04:11:51 djm Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
14 * Copyright (c) 2000 Markus Friedl. All rights reserved.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
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.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <sys/types.h>
49 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
56 static LogLevel log_level = SYSLOG_LEVEL_INFO;
57 static int log_on_stderr = 1;
58 static int log_stderr_fd = STDERR_FILENO;
59 static int log_facility = LOG_AUTH;
60 static const char *argv0;
61 static log_handler_fn *log_handler;
62 static void *log_handler_ctx;
63 static char **log_verbose;
64 static size_t nlog_verbose;
66 extern char *__progname;
68 #define LOG_SYSLOG_VIS (VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL)
69 #define LOG_STDERR_VIS (VIS_SAFE|VIS_OCTAL)
71 /* textual representation of log-facilities/levels */
76 } log_facilities[] = {
77 { "DAEMON", SYSLOG_FACILITY_DAEMON },
78 { "USER", SYSLOG_FACILITY_USER },
79 { "AUTH", SYSLOG_FACILITY_AUTH },
81 { "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV },
83 { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
84 { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
85 { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
86 { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
87 { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
88 { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
89 { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
90 { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
91 { NULL, SYSLOG_FACILITY_NOT_SET }
99 { "QUIET", SYSLOG_LEVEL_QUIET },
100 { "FATAL", SYSLOG_LEVEL_FATAL },
101 { "ERROR", SYSLOG_LEVEL_ERROR },
102 { "INFO", SYSLOG_LEVEL_INFO },
103 { "VERBOSE", SYSLOG_LEVEL_VERBOSE },
104 { "DEBUG", SYSLOG_LEVEL_DEBUG1 },
105 { "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
106 { "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
107 { "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
108 { NULL, SYSLOG_LEVEL_NOT_SET }
118 log_facility_number(char *name)
123 for (i = 0; log_facilities[i].name; i++)
124 if (strcasecmp(log_facilities[i].name, name) == 0)
125 return log_facilities[i].val;
126 return SYSLOG_FACILITY_NOT_SET;
130 log_facility_name(SyslogFacility facility)
134 for (i = 0; log_facilities[i].name; i++)
135 if (log_facilities[i].val == facility)
136 return log_facilities[i].name;
141 log_level_number(char *name)
146 for (i = 0; log_levels[i].name; i++)
147 if (strcasecmp(log_levels[i].name, name) == 0)
148 return log_levels[i].val;
149 return SYSLOG_LEVEL_NOT_SET;
153 log_level_name(LogLevel level)
157 for (i = 0; log_levels[i].name != NULL; i++)
158 if (log_levels[i].val == level)
159 return log_levels[i].name;
164 log_verbose_add(const char *s)
168 /* Ignore failures here */
169 if ((tmp = recallocarray(log_verbose, nlog_verbose, nlog_verbose + 1,
170 sizeof(*log_verbose))) != NULL) {
172 if ((log_verbose[nlog_verbose] = strdup(s)) != NULL)
178 log_verbose_reset(void)
182 for (i = 0; i < nlog_verbose; i++)
183 free(log_verbose[i]);
190 * Initialize the log.
194 log_init(const char *av0, LogLevel level, SyslogFacility facility,
197 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
198 struct syslog_data sdata = SYSLOG_DATA_INIT;
203 if (log_change_level(level) != 0) {
204 fprintf(stderr, "Unrecognized internal syslog level code %d\n",
210 log_handler_ctx = NULL;
212 log_on_stderr = on_stderr;
217 case SYSLOG_FACILITY_DAEMON:
218 log_facility = LOG_DAEMON;
220 case SYSLOG_FACILITY_USER:
221 log_facility = LOG_USER;
223 case SYSLOG_FACILITY_AUTH:
224 log_facility = LOG_AUTH;
227 case SYSLOG_FACILITY_AUTHPRIV:
228 log_facility = LOG_AUTHPRIV;
231 case SYSLOG_FACILITY_LOCAL0:
232 log_facility = LOG_LOCAL0;
234 case SYSLOG_FACILITY_LOCAL1:
235 log_facility = LOG_LOCAL1;
237 case SYSLOG_FACILITY_LOCAL2:
238 log_facility = LOG_LOCAL2;
240 case SYSLOG_FACILITY_LOCAL3:
241 log_facility = LOG_LOCAL3;
243 case SYSLOG_FACILITY_LOCAL4:
244 log_facility = LOG_LOCAL4;
246 case SYSLOG_FACILITY_LOCAL5:
247 log_facility = LOG_LOCAL5;
249 case SYSLOG_FACILITY_LOCAL6:
250 log_facility = LOG_LOCAL6;
252 case SYSLOG_FACILITY_LOCAL7:
253 log_facility = LOG_LOCAL7;
257 "Unrecognized internal syslog facility code %d\n",
263 * If an external library (eg libwrap) attempts to use syslog
264 * immediately after reexec, syslog may be pointing to the wrong
265 * facility, so we force an open/close of syslog here.
267 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
268 openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
271 openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
277 log_change_level(LogLevel new_log_level)
279 /* no-op if log_init has not been called */
283 switch (new_log_level) {
284 case SYSLOG_LEVEL_QUIET:
285 case SYSLOG_LEVEL_FATAL:
286 case SYSLOG_LEVEL_ERROR:
287 case SYSLOG_LEVEL_INFO:
288 case SYSLOG_LEVEL_VERBOSE:
289 case SYSLOG_LEVEL_DEBUG1:
290 case SYSLOG_LEVEL_DEBUG2:
291 case SYSLOG_LEVEL_DEBUG3:
292 log_level = new_log_level;
300 log_is_on_stderr(void)
302 return log_on_stderr && log_stderr_fd == STDERR_FILENO;
305 /* redirect what would usually get written to stderr to specified file */
307 log_redirect_stderr_to(const char *logfile)
311 if (logfile == NULL) {
312 if (log_stderr_fd != STDERR_FILENO) {
313 close(log_stderr_fd);
314 log_stderr_fd = STDERR_FILENO;
319 if ((fd = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0600)) == -1) {
320 fprintf(stderr, "Couldn't open logfile %s: %s\n", logfile,
327 #define MSGBUFSIZ 1024
330 set_log_handler(log_handler_fn *handler, void *ctx)
332 log_handler = handler;
333 log_handler_ctx = ctx;
337 do_log(LogLevel level, int force, const char *suffix, const char *fmt,
340 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
341 struct syslog_data sdata = SYSLOG_DATA_INIT;
343 char msgbuf[MSGBUFSIZ];
344 char fmtbuf[MSGBUFSIZ];
347 int saved_errno = errno;
348 log_handler_fn *tmp_handler;
350 if (!force && level > log_level)
354 case SYSLOG_LEVEL_FATAL:
359 case SYSLOG_LEVEL_ERROR:
364 case SYSLOG_LEVEL_INFO:
367 case SYSLOG_LEVEL_VERBOSE:
370 case SYSLOG_LEVEL_DEBUG1:
374 case SYSLOG_LEVEL_DEBUG2:
378 case SYSLOG_LEVEL_DEBUG3:
383 txt = "internal error";
387 if (txt != NULL && log_handler == NULL) {
388 snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
389 vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
391 vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
393 if (suffix != NULL) {
394 snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", msgbuf, suffix);
395 strlcpy(msgbuf, fmtbuf, sizeof(msgbuf));
397 strnvis(fmtbuf, msgbuf, sizeof(fmtbuf),
398 log_on_stderr ? LOG_STDERR_VIS : LOG_SYSLOG_VIS);
399 if (log_handler != NULL) {
400 /* Avoid recursion */
401 tmp_handler = log_handler;
403 tmp_handler(level, force, fmtbuf, log_handler_ctx);
404 log_handler = tmp_handler;
405 } else if (log_on_stderr) {
406 snprintf(msgbuf, sizeof msgbuf, "%.*s\r\n",
407 (int)sizeof msgbuf - 3, fmtbuf);
408 (void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
410 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
411 openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
412 syslog_r(pri, &sdata, "%.500s", fmtbuf);
415 openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
416 syslog(pri, "%.500s", fmtbuf);
424 sshlog(const char *file, const char *func, int line, int showfunc,
425 LogLevel level, const char *suffix, const char *fmt, ...)
430 sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
435 sshlogdie(const char *file, const char *func, int line, int showfunc,
436 LogLevel level, const char *suffix, const char *fmt, ...)
441 sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_INFO,
448 sshsigdie(const char *file, const char *func, int line, int showfunc,
449 LogLevel level, const char *suffix, const char *fmt, ...)
454 sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_FATAL,
461 sshlogv(const char *file, const char *func, int line, int showfunc,
462 LogLevel level, const char *suffix, const char *fmt, va_list args)
464 char tag[128], fmt2[MSGBUFSIZ + 128];
469 snprintf(tag, sizeof(tag), "%.48s:%.48s():%d (pid=%ld)",
470 (cp = strrchr(file, '/')) == NULL ? file : cp + 1, func, line,
472 for (i = 0; i < nlog_verbose; i++) {
473 if (match_pattern_list(tag, log_verbose[i], 0) == 1) {
480 snprintf(fmt2, sizeof(fmt2), "%s: %s", tag, fmt);
482 snprintf(fmt2, sizeof(fmt2), "%s: %s", func, fmt);
484 strlcpy(fmt2, fmt, sizeof(fmt2));
486 do_log(level, forced, suffix, fmt2, args);
490 sshlogdirect(LogLevel level, int forced, const char *fmt, ...)
495 do_log(level, forced, NULL, fmt, args);