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3c0ef626 | 1 | /* |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * | |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | */ | |
12 | /* | |
13 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #include "includes.h" | |
7cac2b65 | 37 | RCSID("$OpenBSD: log.c,v 1.28 2003/05/24 09:02:22 djm Exp $"); |
3c0ef626 | 38 | |
39 | #include "log.h" | |
40 | #include "xmalloc.h" | |
41 | ||
42 | #include <syslog.h> | |
43 | ||
44 | static LogLevel log_level = SYSLOG_LEVEL_INFO; | |
45 | static int log_on_stderr = 1; | |
46 | static int log_facility = LOG_AUTH; | |
47 | static char *argv0; | |
48 | ||
49 | extern char *__progname; | |
50 | ||
51 | /* textual representation of log-facilities/levels */ | |
52 | ||
53 | static struct { | |
54 | const char *name; | |
55 | SyslogFacility val; | |
56 | } log_facilities[] = { | |
57 | { "DAEMON", SYSLOG_FACILITY_DAEMON }, | |
58 | { "USER", SYSLOG_FACILITY_USER }, | |
59 | { "AUTH", SYSLOG_FACILITY_AUTH }, | |
60 | #ifdef LOG_AUTHPRIV | |
61 | { "AUTHPRIV", SYSLOG_FACILITY_AUTHPRIV }, | |
62 | #endif | |
63 | { "LOCAL0", SYSLOG_FACILITY_LOCAL0 }, | |
64 | { "LOCAL1", SYSLOG_FACILITY_LOCAL1 }, | |
65 | { "LOCAL2", SYSLOG_FACILITY_LOCAL2 }, | |
66 | { "LOCAL3", SYSLOG_FACILITY_LOCAL3 }, | |
67 | { "LOCAL4", SYSLOG_FACILITY_LOCAL4 }, | |
68 | { "LOCAL5", SYSLOG_FACILITY_LOCAL5 }, | |
69 | { "LOCAL6", SYSLOG_FACILITY_LOCAL6 }, | |
70 | { "LOCAL7", SYSLOG_FACILITY_LOCAL7 }, | |
b59afbfe | 71 | { NULL, SYSLOG_FACILITY_NOT_SET } |
3c0ef626 | 72 | }; |
73 | ||
74 | static struct { | |
75 | const char *name; | |
76 | LogLevel val; | |
77 | } log_levels[] = | |
78 | { | |
79 | { "QUIET", SYSLOG_LEVEL_QUIET }, | |
80 | { "FATAL", SYSLOG_LEVEL_FATAL }, | |
81 | { "ERROR", SYSLOG_LEVEL_ERROR }, | |
82 | { "INFO", SYSLOG_LEVEL_INFO }, | |
83 | { "VERBOSE", SYSLOG_LEVEL_VERBOSE }, | |
84 | { "DEBUG", SYSLOG_LEVEL_DEBUG1 }, | |
85 | { "DEBUG1", SYSLOG_LEVEL_DEBUG1 }, | |
86 | { "DEBUG2", SYSLOG_LEVEL_DEBUG2 }, | |
87 | { "DEBUG3", SYSLOG_LEVEL_DEBUG3 }, | |
b59afbfe | 88 | { NULL, SYSLOG_LEVEL_NOT_SET } |
3c0ef626 | 89 | }; |
90 | ||
3c0ef626 | 91 | SyslogFacility |
92 | log_facility_number(char *name) | |
93 | { | |
94 | int i; | |
d03f4262 | 95 | |
3c0ef626 | 96 | if (name != NULL) |
97 | for (i = 0; log_facilities[i].name; i++) | |
98 | if (strcasecmp(log_facilities[i].name, name) == 0) | |
99 | return log_facilities[i].val; | |
b59afbfe | 100 | return SYSLOG_FACILITY_NOT_SET; |
3c0ef626 | 101 | } |
102 | ||
103 | LogLevel | |
104 | log_level_number(char *name) | |
105 | { | |
106 | int i; | |
d03f4262 | 107 | |
3c0ef626 | 108 | if (name != NULL) |
109 | for (i = 0; log_levels[i].name; i++) | |
110 | if (strcasecmp(log_levels[i].name, name) == 0) | |
111 | return log_levels[i].val; | |
b59afbfe | 112 | return SYSLOG_LEVEL_NOT_SET; |
3c0ef626 | 113 | } |
114 | ||
115 | /* Error messages that should be logged. */ | |
116 | ||
117 | void | |
118 | error(const char *fmt,...) | |
119 | { | |
120 | va_list args; | |
d03f4262 | 121 | |
3c0ef626 | 122 | va_start(args, fmt); |
123 | do_log(SYSLOG_LEVEL_ERROR, fmt, args); | |
124 | va_end(args); | |
125 | } | |
126 | ||
127 | /* Log this message (information that usually should go to the log). */ | |
128 | ||
129 | void | |
7cac2b65 | 130 | logit(const char *fmt,...) |
3c0ef626 | 131 | { |
132 | va_list args; | |
d03f4262 | 133 | |
3c0ef626 | 134 | va_start(args, fmt); |
135 | do_log(SYSLOG_LEVEL_INFO, fmt, args); | |
136 | va_end(args); | |
137 | } | |
138 | ||
139 | /* More detailed messages (information that does not need to go to the log). */ | |
140 | ||
141 | void | |
142 | verbose(const char *fmt,...) | |
143 | { | |
144 | va_list args; | |
d03f4262 | 145 | |
3c0ef626 | 146 | va_start(args, fmt); |
147 | do_log(SYSLOG_LEVEL_VERBOSE, fmt, args); | |
148 | va_end(args); | |
149 | } | |
150 | ||
151 | /* Debugging messages that should not be logged during normal operation. */ | |
152 | ||
153 | void | |
154 | debug(const char *fmt,...) | |
155 | { | |
156 | va_list args; | |
d03f4262 | 157 | |
3c0ef626 | 158 | va_start(args, fmt); |
159 | do_log(SYSLOG_LEVEL_DEBUG1, fmt, args); | |
160 | va_end(args); | |
161 | } | |
162 | ||
163 | void | |
164 | debug2(const char *fmt,...) | |
165 | { | |
166 | va_list args; | |
d03f4262 | 167 | |
3c0ef626 | 168 | va_start(args, fmt); |
169 | do_log(SYSLOG_LEVEL_DEBUG2, fmt, args); | |
170 | va_end(args); | |
171 | } | |
172 | ||
173 | void | |
174 | debug3(const char *fmt,...) | |
175 | { | |
176 | va_list args; | |
d03f4262 | 177 | |
3c0ef626 | 178 | va_start(args, fmt); |
179 | do_log(SYSLOG_LEVEL_DEBUG3, fmt, args); | |
180 | va_end(args); | |
181 | } | |
182 | ||
183 | /* Fatal cleanup */ | |
184 | ||
185 | struct fatal_cleanup { | |
186 | struct fatal_cleanup *next; | |
187 | void (*proc) (void *); | |
188 | void *context; | |
189 | }; | |
190 | ||
191 | static struct fatal_cleanup *fatal_cleanups = NULL; | |
192 | ||
193 | /* Registers a cleanup function to be called by fatal() before exiting. */ | |
194 | ||
195 | void | |
196 | fatal_add_cleanup(void (*proc) (void *), void *context) | |
197 | { | |
198 | struct fatal_cleanup *cu; | |
199 | ||
200 | cu = xmalloc(sizeof(*cu)); | |
201 | cu->proc = proc; | |
202 | cu->context = context; | |
203 | cu->next = fatal_cleanups; | |
204 | fatal_cleanups = cu; | |
205 | } | |
206 | ||
207 | /* Removes a cleanup frunction to be called at fatal(). */ | |
208 | ||
209 | void | |
210 | fatal_remove_cleanup(void (*proc) (void *context), void *context) | |
211 | { | |
212 | struct fatal_cleanup **cup, *cu; | |
213 | ||
214 | for (cup = &fatal_cleanups; *cup; cup = &cu->next) { | |
215 | cu = *cup; | |
216 | if (cu->proc == proc && cu->context == context) { | |
217 | *cup = cu->next; | |
218 | xfree(cu); | |
219 | return; | |
220 | } | |
221 | } | |
222 | fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx", | |
223 | (u_long) proc, (u_long) context); | |
224 | } | |
225 | ||
d03f4262 | 226 | /* Remove all cleanups, to be called after fork() */ |
227 | void | |
228 | fatal_remove_all_cleanups(void) | |
229 | { | |
230 | struct fatal_cleanup *cu, *next_cu; | |
231 | ||
232 | for (cu = fatal_cleanups; cu; cu = next_cu) { | |
233 | next_cu = cu->next; | |
234 | xfree(cu); | |
235 | } | |
bfe49944 | 236 | fatal_cleanups = NULL; |
d03f4262 | 237 | } |
238 | ||
3c0ef626 | 239 | /* Cleanup and exit */ |
240 | void | |
241 | fatal_cleanup(void) | |
242 | { | |
243 | struct fatal_cleanup *cu, *next_cu; | |
244 | static int called = 0; | |
245 | ||
246 | if (called) | |
247 | exit(255); | |
248 | called = 1; | |
249 | /* Call cleanup functions. */ | |
250 | for (cu = fatal_cleanups; cu; cu = next_cu) { | |
251 | next_cu = cu->next; | |
252 | debug("Calling cleanup 0x%lx(0x%lx)", | |
b59afbfe | 253 | (u_long) cu->proc, (u_long) cu->context); |
3c0ef626 | 254 | (*cu->proc) (cu->context); |
255 | } | |
256 | exit(255); | |
257 | } | |
258 | ||
259 | ||
260 | /* | |
261 | * Initialize the log. | |
262 | */ | |
263 | ||
264 | void | |
265 | log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr) | |
266 | { | |
267 | argv0 = av0; | |
268 | ||
269 | switch (level) { | |
270 | case SYSLOG_LEVEL_QUIET: | |
271 | case SYSLOG_LEVEL_FATAL: | |
272 | case SYSLOG_LEVEL_ERROR: | |
273 | case SYSLOG_LEVEL_INFO: | |
274 | case SYSLOG_LEVEL_VERBOSE: | |
275 | case SYSLOG_LEVEL_DEBUG1: | |
276 | case SYSLOG_LEVEL_DEBUG2: | |
277 | case SYSLOG_LEVEL_DEBUG3: | |
278 | log_level = level; | |
279 | break; | |
280 | default: | |
281 | fprintf(stderr, "Unrecognized internal syslog level code %d\n", | |
282 | (int) level); | |
283 | exit(1); | |
284 | } | |
285 | ||
286 | log_on_stderr = on_stderr; | |
287 | if (on_stderr) | |
288 | return; | |
289 | ||
290 | switch (facility) { | |
291 | case SYSLOG_FACILITY_DAEMON: | |
292 | log_facility = LOG_DAEMON; | |
293 | break; | |
294 | case SYSLOG_FACILITY_USER: | |
295 | log_facility = LOG_USER; | |
296 | break; | |
297 | case SYSLOG_FACILITY_AUTH: | |
298 | log_facility = LOG_AUTH; | |
299 | break; | |
300 | #ifdef LOG_AUTHPRIV | |
301 | case SYSLOG_FACILITY_AUTHPRIV: | |
302 | log_facility = LOG_AUTHPRIV; | |
303 | break; | |
304 | #endif | |
305 | case SYSLOG_FACILITY_LOCAL0: | |
306 | log_facility = LOG_LOCAL0; | |
307 | break; | |
308 | case SYSLOG_FACILITY_LOCAL1: | |
309 | log_facility = LOG_LOCAL1; | |
310 | break; | |
311 | case SYSLOG_FACILITY_LOCAL2: | |
312 | log_facility = LOG_LOCAL2; | |
313 | break; | |
314 | case SYSLOG_FACILITY_LOCAL3: | |
315 | log_facility = LOG_LOCAL3; | |
316 | break; | |
317 | case SYSLOG_FACILITY_LOCAL4: | |
318 | log_facility = LOG_LOCAL4; | |
319 | break; | |
320 | case SYSLOG_FACILITY_LOCAL5: | |
321 | log_facility = LOG_LOCAL5; | |
322 | break; | |
323 | case SYSLOG_FACILITY_LOCAL6: | |
324 | log_facility = LOG_LOCAL6; | |
325 | break; | |
326 | case SYSLOG_FACILITY_LOCAL7: | |
327 | log_facility = LOG_LOCAL7; | |
328 | break; | |
329 | default: | |
330 | fprintf(stderr, | |
331 | "Unrecognized internal syslog facility code %d\n", | |
332 | (int) facility); | |
333 | exit(1); | |
334 | } | |
335 | } | |
336 | ||
337 | #define MSGBUFSIZ 1024 | |
338 | ||
b59afbfe | 339 | void |
3c0ef626 | 340 | do_log(LogLevel level, const char *fmt, va_list args) |
341 | { | |
7cac2b65 | 342 | #ifdef OPENLOG_R |
343 | struct syslog_data sdata = SYSLOG_DATA_INIT; | |
344 | #endif | |
3c0ef626 | 345 | char msgbuf[MSGBUFSIZ]; |
346 | char fmtbuf[MSGBUFSIZ]; | |
347 | char *txt = NULL; | |
348 | int pri = LOG_INFO; | |
349 | ||
350 | if (level > log_level) | |
351 | return; | |
352 | ||
353 | switch (level) { | |
354 | case SYSLOG_LEVEL_FATAL: | |
355 | if (!log_on_stderr) | |
356 | txt = "fatal"; | |
357 | pri = LOG_CRIT; | |
358 | break; | |
359 | case SYSLOG_LEVEL_ERROR: | |
360 | if (!log_on_stderr) | |
361 | txt = "error"; | |
362 | pri = LOG_ERR; | |
363 | break; | |
364 | case SYSLOG_LEVEL_INFO: | |
365 | pri = LOG_INFO; | |
366 | break; | |
367 | case SYSLOG_LEVEL_VERBOSE: | |
368 | pri = LOG_INFO; | |
369 | break; | |
370 | case SYSLOG_LEVEL_DEBUG1: | |
371 | txt = "debug1"; | |
372 | pri = LOG_DEBUG; | |
373 | break; | |
374 | case SYSLOG_LEVEL_DEBUG2: | |
375 | txt = "debug2"; | |
376 | pri = LOG_DEBUG; | |
377 | break; | |
378 | case SYSLOG_LEVEL_DEBUG3: | |
379 | txt = "debug3"; | |
380 | pri = LOG_DEBUG; | |
381 | break; | |
382 | default: | |
383 | txt = "internal error"; | |
384 | pri = LOG_ERR; | |
385 | break; | |
386 | } | |
387 | if (txt != NULL) { | |
388 | snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt); | |
389 | vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args); | |
390 | } else { | |
391 | vsnprintf(msgbuf, sizeof(msgbuf), fmt, args); | |
392 | } | |
7cac2b65 | 393 | strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE|VIS_OCTAL); |
3c0ef626 | 394 | if (log_on_stderr) { |
7cac2b65 | 395 | snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf); |
396 | write(STDERR_FILENO, msgbuf, strlen(msgbuf)); | |
3c0ef626 | 397 | } else { |
7cac2b65 | 398 | #ifdef OPENLOG_R |
399 | openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata); | |
400 | syslog_r(pri, &sdata, "%.500s", fmtbuf); | |
401 | closelog_r(&sdata); | |
402 | #else | |
3c0ef626 | 403 | openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility); |
bfe49944 | 404 | syslog(pri, "%.500s", fmtbuf); |
3c0ef626 | 405 | closelog(); |
7cac2b65 | 406 | #endif |
3c0ef626 | 407 | } |
408 | } |