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source: trunk/third/openssh/log.c @ 18763

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Revision 18763, 8.8 KB checked in by zacheiss, 21 years ago (diff)
Merge openssh 3.5p1.

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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"
37	RCSID("$OpenBSD: log.c,v 1.24 2002/07/19 15:43:33 markus Exp $");
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 },
71	{ NULL, SYSLOG_FACILITY_NOT_SET }
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 },
88	{ NULL, SYSLOG_LEVEL_NOT_SET }
89	};
90
91	SyslogFacility
92	log_facility_number(char *name)
93	{
94	int i;
95
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;
100	return SYSLOG_FACILITY_NOT_SET;
101	}
102
103	LogLevel
104	log_level_number(char *name)
105	{
106	int i;
107
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;
112	return SYSLOG_LEVEL_NOT_SET;
113	}
114
115	/* Error messages that should be logged. */
116
117	void
118	error(const char *fmt,...)
119	{
120	va_list args;
121
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
130	log(const char *fmt,...)
131	{
132	va_list args;
133
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;
145
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;
157
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;
167
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;
177
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
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	}
236	}
237
238	/* Cleanup and exit */
239	void
240	fatal_cleanup(void)
241	{
242	struct fatal_cleanup cu, next_cu;
243	static int called = 0;
244
245	if (called)
246	exit(255);
247	called = 1;
248	/* Call cleanup functions. */
249	for (cu = fatal_cleanups; cu; cu = next_cu) {
250	next_cu = cu->next;
251	debug("Calling cleanup 0x%lx(0x%lx)",
252	(u_long) cu->proc, (u_long) cu->context);
253	(*cu->proc) (cu->context);
254	}
255	exit(255);
256	}
257
258
259	/*
260	* Initialize the log.
261	*/
262
263	void
264	log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
265	{
266	argv0 = av0;
267
268	switch (level) {
269	case SYSLOG_LEVEL_QUIET:
270	case SYSLOG_LEVEL_FATAL:
271	case SYSLOG_LEVEL_ERROR:
272	case SYSLOG_LEVEL_INFO:
273	case SYSLOG_LEVEL_VERBOSE:
274	case SYSLOG_LEVEL_DEBUG1:
275	case SYSLOG_LEVEL_DEBUG2:
276	case SYSLOG_LEVEL_DEBUG3:
277	log_level = level;
278	break;
279	default:
280	fprintf(stderr, "Unrecognized internal syslog level code %d\n",
281	(int) level);
282	exit(1);
283	}
284
285	log_on_stderr = on_stderr;
286	if (on_stderr)
287	return;
288
289	switch (facility) {
290	case SYSLOG_FACILITY_DAEMON:
291	log_facility = LOG_DAEMON;
292	break;
293	case SYSLOG_FACILITY_USER:
294	log_facility = LOG_USER;
295	break;
296	case SYSLOG_FACILITY_AUTH:
297	log_facility = LOG_AUTH;
298	break;
299	#ifdef LOG_AUTHPRIV
300	case SYSLOG_FACILITY_AUTHPRIV:
301	log_facility = LOG_AUTHPRIV;
302	break;
303	#endif
304	case SYSLOG_FACILITY_LOCAL0:
305	log_facility = LOG_LOCAL0;
306	break;
307	case SYSLOG_FACILITY_LOCAL1:
308	log_facility = LOG_LOCAL1;
309	break;
310	case SYSLOG_FACILITY_LOCAL2:
311	log_facility = LOG_LOCAL2;
312	break;
313	case SYSLOG_FACILITY_LOCAL3:
314	log_facility = LOG_LOCAL3;
315	break;
316	case SYSLOG_FACILITY_LOCAL4:
317	log_facility = LOG_LOCAL4;
318	break;
319	case SYSLOG_FACILITY_LOCAL5:
320	log_facility = LOG_LOCAL5;
321	break;
322	case SYSLOG_FACILITY_LOCAL6:
323	log_facility = LOG_LOCAL6;
324	break;
325	case SYSLOG_FACILITY_LOCAL7:
326	log_facility = LOG_LOCAL7;
327	break;
328	default:
329	fprintf(stderr,
330	"Unrecognized internal syslog facility code %d\n",
331	(int) facility);
332	exit(1);
333	}
334	}
335
336	#define MSGBUFSIZ 1024
337
338	void
339	do_log(LogLevel level, const char *fmt, va_list args)
340	{
341	char msgbuf[MSGBUFSIZ];
342	char fmtbuf[MSGBUFSIZ];
343	char *txt = NULL;
344	int pri = LOG_INFO;
345
346	if (level > log_level)
347	return;
348
349	switch (level) {
350	case SYSLOG_LEVEL_FATAL:
351	if (!log_on_stderr)
352	txt = "fatal";
353	pri = LOG_CRIT;
354	break;
355	case SYSLOG_LEVEL_ERROR:
356	if (!log_on_stderr)
357	txt = "error";
358	pri = LOG_ERR;
359	break;
360	case SYSLOG_LEVEL_INFO:
361	pri = LOG_INFO;
362	break;
363	case SYSLOG_LEVEL_VERBOSE:
364	pri = LOG_INFO;
365	break;
366	case SYSLOG_LEVEL_DEBUG1:
367	txt = "debug1";
368	pri = LOG_DEBUG;
369	break;
370	case SYSLOG_LEVEL_DEBUG2:
371	txt = "debug2";
372	pri = LOG_DEBUG;
373	break;
374	case SYSLOG_LEVEL_DEBUG3:
375	txt = "debug3";
376	pri = LOG_DEBUG;
377	break;
378	default:
379	txt = "internal error";
380	pri = LOG_ERR;
381	break;
382	}
383	if (txt != NULL) {
384	snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
385	vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
386	} else {
387	vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
388	}
389	if (log_on_stderr) {
390	fprintf(stderr, "%d: %s\r\n", getpid(), msgbuf);
391	} else {
392	openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
393	syslog(pri, "%.500s", msgbuf);
394	closelog();
395	}
396	}

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