Annotation of src/usr.bin/ssh/log.c, Revision 1.17.2.1
1.1 markus 1: /*
1.9 markus 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: /*
1.8 deraadt 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.
1.6 markus 34: */
1.1 markus 35:
36: #include "includes.h"
1.17.2.1! jason 37: RCSID("$OpenBSD: log.c,v 1.18 2001/06/26 17:27:23 markus Exp $");
1.1 markus 38:
1.15 markus 39: #include "log.h"
1.1 markus 40: #include "xmalloc.h"
41:
1.16 markus 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: { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
61: { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
62: { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
63: { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
64: { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
65: { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
66: { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
67: { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
68: { NULL, 0 }
69: };
70:
71: static struct {
72: const char *name;
73: LogLevel val;
74: } log_levels[] =
75: {
76: { "QUIET", SYSLOG_LEVEL_QUIET },
77: { "FATAL", SYSLOG_LEVEL_FATAL },
78: { "ERROR", SYSLOG_LEVEL_ERROR },
79: { "INFO", SYSLOG_LEVEL_INFO },
80: { "VERBOSE", SYSLOG_LEVEL_VERBOSE },
81: { "DEBUG", SYSLOG_LEVEL_DEBUG1 },
82: { "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
83: { "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
84: { "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
85: { NULL, 0 }
86: };
87:
1.17.2.1! jason 88: static void do_log(LogLevel level, const char *fmt, va_list args);
! 89:
1.16 markus 90: SyslogFacility
91: log_facility_number(char *name)
92: {
93: int i;
94: if (name != NULL)
95: for (i = 0; log_facilities[i].name; i++)
96: if (strcasecmp(log_facilities[i].name, name) == 0)
97: return log_facilities[i].val;
98: return (SyslogFacility) - 1;
99: }
100:
101: LogLevel
102: log_level_number(char *name)
103: {
104: int i;
105: if (name != NULL)
106: for (i = 0; log_levels[i].name; i++)
107: if (strcasecmp(log_levels[i].name, name) == 0)
108: return log_levels[i].val;
109: return (LogLevel) - 1;
110: }
1.1 markus 111: /* Fatal messages. This function never returns. */
112:
113: void
1.4 markus 114: fatal(const char *fmt,...)
1.1 markus 115: {
1.4 markus 116: va_list args;
117: va_start(args, fmt);
118: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
119: va_end(args);
120: fatal_cleanup();
1.1 markus 121: }
122:
123: /* Error messages that should be logged. */
124:
125: void
1.4 markus 126: error(const char *fmt,...)
1.1 markus 127: {
1.4 markus 128: va_list args;
129: va_start(args, fmt);
130: do_log(SYSLOG_LEVEL_ERROR, fmt, args);
131: va_end(args);
1.1 markus 132: }
133:
134: /* Log this message (information that usually should go to the log). */
135:
136: void
1.4 markus 137: log(const char *fmt,...)
1.1 markus 138: {
1.4 markus 139: va_list args;
140: va_start(args, fmt);
1.14 markus 141: do_log(SYSLOG_LEVEL_INFO, fmt, args);
1.4 markus 142: va_end(args);
1.1 markus 143: }
144:
145: /* More detailed messages (information that does not need to go to the log). */
146:
147: void
1.4 markus 148: verbose(const char *fmt,...)
1.1 markus 149: {
1.4 markus 150: va_list args;
151: va_start(args, fmt);
152: do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
153: va_end(args);
1.1 markus 154: }
155:
156: /* Debugging messages that should not be logged during normal operation. */
157:
158: void
1.4 markus 159: debug(const char *fmt,...)
1.1 markus 160: {
1.4 markus 161: va_list args;
162: va_start(args, fmt);
1.10 markus 163: do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
164: va_end(args);
165: }
166:
167: void
168: debug2(const char *fmt,...)
169: {
170: va_list args;
171: va_start(args, fmt);
172: do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
173: va_end(args);
174: }
175:
176: void
177: debug3(const char *fmt,...)
178: {
179: va_list args;
180: va_start(args, fmt);
181: do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
1.4 markus 182: va_end(args);
1.1 markus 183: }
184:
185: /* Fatal cleanup */
186:
1.4 markus 187: struct fatal_cleanup {
188: struct fatal_cleanup *next;
189: void (*proc) (void *);
190: void *context;
1.1 markus 191: };
192:
193: static struct fatal_cleanup *fatal_cleanups = NULL;
194:
195: /* Registers a cleanup function to be called by fatal() before exiting. */
196:
197: void
1.4 markus 198: fatal_add_cleanup(void (*proc) (void *), void *context)
1.1 markus 199: {
1.4 markus 200: struct fatal_cleanup *cu;
1.1 markus 201:
1.4 markus 202: cu = xmalloc(sizeof(*cu));
203: cu->proc = proc;
204: cu->context = context;
205: cu->next = fatal_cleanups;
206: fatal_cleanups = cu;
1.1 markus 207: }
208:
209: /* Removes a cleanup frunction to be called at fatal(). */
210:
211: void
1.4 markus 212: fatal_remove_cleanup(void (*proc) (void *context), void *context)
1.1 markus 213: {
1.4 markus 214: struct fatal_cleanup **cup, *cu;
215:
216: for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
217: cu = *cup;
218: if (cu->proc == proc && cu->context == context) {
219: *cup = cu->next;
220: xfree(cu);
221: return;
222: }
1.1 markus 223: }
1.17 millert 224: fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx",
1.16 markus 225: (u_long) proc, (u_long) context);
1.1 markus 226: }
227:
228: /* Cleanup and exit */
229: void
230: fatal_cleanup(void)
231: {
1.4 markus 232: struct fatal_cleanup *cu, *next_cu;
233: static int called = 0;
1.1 markus 234:
1.4 markus 235: if (called)
236: exit(255);
237: called = 1;
238: /* Call cleanup functions. */
239: for (cu = fatal_cleanups; cu; cu = next_cu) {
240: next_cu = cu->next;
241: debug("Calling cleanup 0x%lx(0x%lx)",
1.12 markus 242: (u_long) cu->proc, (u_long) cu->context);
1.4 markus 243: (*cu->proc) (cu->context);
244: }
245: exit(255);
1.2 markus 246: }
247:
248:
1.16 markus 249: /*
250: * Initialize the log.
251: */
1.2 markus 252:
1.16 markus 253: void
254: log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
1.2 markus 255: {
1.16 markus 256: argv0 = av0;
257:
258: switch (level) {
259: case SYSLOG_LEVEL_QUIET:
260: case SYSLOG_LEVEL_FATAL:
261: case SYSLOG_LEVEL_ERROR:
262: case SYSLOG_LEVEL_INFO:
263: case SYSLOG_LEVEL_VERBOSE:
264: case SYSLOG_LEVEL_DEBUG1:
265: case SYSLOG_LEVEL_DEBUG2:
266: case SYSLOG_LEVEL_DEBUG3:
267: log_level = level;
268: break;
269: default:
270: fprintf(stderr, "Unrecognized internal syslog level code %d\n",
271: (int) level);
272: exit(1);
273: }
1.2 markus 274:
1.16 markus 275: log_on_stderr = on_stderr;
276: if (on_stderr)
277: return;
278:
279: switch (facility) {
280: case SYSLOG_FACILITY_DAEMON:
281: log_facility = LOG_DAEMON;
282: break;
283: case SYSLOG_FACILITY_USER:
284: log_facility = LOG_USER;
285: break;
286: case SYSLOG_FACILITY_AUTH:
287: log_facility = LOG_AUTH;
288: break;
289: case SYSLOG_FACILITY_LOCAL0:
290: log_facility = LOG_LOCAL0;
291: break;
292: case SYSLOG_FACILITY_LOCAL1:
293: log_facility = LOG_LOCAL1;
294: break;
295: case SYSLOG_FACILITY_LOCAL2:
296: log_facility = LOG_LOCAL2;
297: break;
298: case SYSLOG_FACILITY_LOCAL3:
299: log_facility = LOG_LOCAL3;
300: break;
301: case SYSLOG_FACILITY_LOCAL4:
302: log_facility = LOG_LOCAL4;
303: break;
304: case SYSLOG_FACILITY_LOCAL5:
305: log_facility = LOG_LOCAL5;
306: break;
307: case SYSLOG_FACILITY_LOCAL6:
308: log_facility = LOG_LOCAL6;
309: break;
310: case SYSLOG_FACILITY_LOCAL7:
311: log_facility = LOG_LOCAL7;
312: break;
313: default:
314: fprintf(stderr,
315: "Unrecognized internal syslog facility code %d\n",
316: (int) facility);
317: exit(1);
318: }
1.2 markus 319: }
320:
1.16 markus 321: #define MSGBUFSIZ 1024
322:
1.17.2.1! jason 323: static void
1.16 markus 324: do_log(LogLevel level, const char *fmt, va_list args)
1.2 markus 325: {
1.16 markus 326: char msgbuf[MSGBUFSIZ];
327: char fmtbuf[MSGBUFSIZ];
328: char *txt = NULL;
329: int pri = LOG_INFO;
330:
331: if (level > log_level)
332: return;
333:
334: switch (level) {
335: case SYSLOG_LEVEL_FATAL:
336: if (!log_on_stderr)
337: txt = "fatal";
338: pri = LOG_CRIT;
339: break;
340: case SYSLOG_LEVEL_ERROR:
341: if (!log_on_stderr)
342: txt = "error";
343: pri = LOG_ERR;
344: break;
345: case SYSLOG_LEVEL_INFO:
346: pri = LOG_INFO;
347: break;
348: case SYSLOG_LEVEL_VERBOSE:
349: pri = LOG_INFO;
350: break;
351: case SYSLOG_LEVEL_DEBUG1:
352: txt = "debug1";
353: pri = LOG_DEBUG;
354: break;
355: case SYSLOG_LEVEL_DEBUG2:
356: txt = "debug2";
357: pri = LOG_DEBUG;
358: break;
359: case SYSLOG_LEVEL_DEBUG3:
360: txt = "debug3";
361: pri = LOG_DEBUG;
362: break;
363: default:
364: txt = "internal error";
365: pri = LOG_ERR;
366: break;
367: }
368: if (txt != NULL) {
369: snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
370: vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
371: } else {
372: vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
373: }
374: if (log_on_stderr) {
375: fprintf(stderr, "%s\r\n", msgbuf);
376: } else {
377: openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
378: syslog(pri, "%.500s", msgbuf);
379: closelog();
380: }
1.1 markus 381: }
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