Annotation of src/usr.bin/ssh/log.c, Revision 1.27
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"
1.27 ! deraadt 37: RCSID("$OpenBSD: log.c,v 1.26 2003/04/08 20:21:28 itojun 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 },
1.21 markus 68: { NULL, SYSLOG_FACILITY_NOT_SET }
1.16 markus 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 },
1.21 markus 85: { NULL, SYSLOG_LEVEL_NOT_SET }
1.16 markus 86: };
87:
88: SyslogFacility
89: log_facility_number(char *name)
90: {
91: int i;
1.23 deraadt 92:
1.16 markus 93: if (name != NULL)
94: for (i = 0; log_facilities[i].name; i++)
95: if (strcasecmp(log_facilities[i].name, name) == 0)
96: return log_facilities[i].val;
1.21 markus 97: return SYSLOG_FACILITY_NOT_SET;
1.16 markus 98: }
99:
100: LogLevel
101: log_level_number(char *name)
102: {
103: int i;
1.23 deraadt 104:
1.16 markus 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;
1.21 markus 109: return SYSLOG_LEVEL_NOT_SET;
1.16 markus 110: }
1.1 markus 111:
112: /* Error messages that should be logged. */
113:
114: void
1.4 markus 115: error(const char *fmt,...)
1.1 markus 116: {
1.4 markus 117: va_list args;
1.23 deraadt 118:
1.4 markus 119: va_start(args, fmt);
120: do_log(SYSLOG_LEVEL_ERROR, fmt, args);
121: va_end(args);
1.1 markus 122: }
123:
124: /* Log this message (information that usually should go to the log). */
125:
126: void
1.26 itojun 127: logit(const char *fmt,...)
1.1 markus 128: {
1.4 markus 129: va_list args;
1.23 deraadt 130:
1.4 markus 131: va_start(args, fmt);
1.14 markus 132: do_log(SYSLOG_LEVEL_INFO, fmt, args);
1.4 markus 133: va_end(args);
1.1 markus 134: }
135:
136: /* More detailed messages (information that does not need to go to the log). */
137:
138: void
1.4 markus 139: verbose(const char *fmt,...)
1.1 markus 140: {
1.4 markus 141: va_list args;
1.23 deraadt 142:
1.4 markus 143: va_start(args, fmt);
144: do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
145: va_end(args);
1.1 markus 146: }
147:
148: /* Debugging messages that should not be logged during normal operation. */
149:
150: void
1.4 markus 151: debug(const char *fmt,...)
1.1 markus 152: {
1.4 markus 153: va_list args;
1.23 deraadt 154:
1.4 markus 155: va_start(args, fmt);
1.10 markus 156: do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
157: va_end(args);
158: }
159:
160: void
161: debug2(const char *fmt,...)
162: {
163: va_list args;
1.23 deraadt 164:
1.10 markus 165: va_start(args, fmt);
166: do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
167: va_end(args);
168: }
169:
170: void
171: debug3(const char *fmt,...)
172: {
173: va_list args;
1.23 deraadt 174:
1.10 markus 175: va_start(args, fmt);
176: do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
1.4 markus 177: va_end(args);
1.1 markus 178: }
179:
180: /* Fatal cleanup */
181:
1.4 markus 182: struct fatal_cleanup {
183: struct fatal_cleanup *next;
184: void (*proc) (void *);
185: void *context;
1.1 markus 186: };
187:
188: static struct fatal_cleanup *fatal_cleanups = NULL;
189:
190: /* Registers a cleanup function to be called by fatal() before exiting. */
191:
192: void
1.4 markus 193: fatal_add_cleanup(void (*proc) (void *), void *context)
1.1 markus 194: {
1.4 markus 195: struct fatal_cleanup *cu;
1.1 markus 196:
1.4 markus 197: cu = xmalloc(sizeof(*cu));
198: cu->proc = proc;
199: cu->context = context;
200: cu->next = fatal_cleanups;
201: fatal_cleanups = cu;
1.1 markus 202: }
203:
204: /* Removes a cleanup frunction to be called at fatal(). */
205:
206: void
1.4 markus 207: fatal_remove_cleanup(void (*proc) (void *context), void *context)
1.1 markus 208: {
1.4 markus 209: struct fatal_cleanup **cup, *cu;
210:
211: for (cup = &fatal_cleanups; *cup; cup = &cu->next) {
212: cu = *cup;
213: if (cu->proc == proc && cu->context == context) {
214: *cup = cu->next;
215: xfree(cu);
216: return;
217: }
1.1 markus 218: }
1.17 millert 219: fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx",
1.16 markus 220: (u_long) proc, (u_long) context);
1.24 markus 221: }
222:
223: /* Remove all cleanups, to be called after fork() */
224: void
225: fatal_remove_all_cleanups(void)
226: {
227: struct fatal_cleanup *cu, *next_cu;
228:
229: for (cu = fatal_cleanups; cu; cu = next_cu) {
230: next_cu = cu->next;
231: xfree(cu);
232: }
1.25 markus 233: fatal_cleanups = NULL;
1.1 markus 234: }
235:
236: /* Cleanup and exit */
237: void
238: fatal_cleanup(void)
239: {
1.4 markus 240: struct fatal_cleanup *cu, *next_cu;
241: static int called = 0;
1.1 markus 242:
1.4 markus 243: if (called)
244: exit(255);
245: called = 1;
246: /* Call cleanup functions. */
247: for (cu = fatal_cleanups; cu; cu = next_cu) {
248: next_cu = cu->next;
249: debug("Calling cleanup 0x%lx(0x%lx)",
1.19 deraadt 250: (u_long) cu->proc, (u_long) cu->context);
1.4 markus 251: (*cu->proc) (cu->context);
252: }
253: exit(255);
1.2 markus 254: }
255:
256:
1.16 markus 257: /*
258: * Initialize the log.
259: */
1.2 markus 260:
1.16 markus 261: void
262: log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
1.2 markus 263: {
1.16 markus 264: argv0 = av0;
265:
266: switch (level) {
267: case SYSLOG_LEVEL_QUIET:
268: case SYSLOG_LEVEL_FATAL:
269: case SYSLOG_LEVEL_ERROR:
270: case SYSLOG_LEVEL_INFO:
271: case SYSLOG_LEVEL_VERBOSE:
272: case SYSLOG_LEVEL_DEBUG1:
273: case SYSLOG_LEVEL_DEBUG2:
274: case SYSLOG_LEVEL_DEBUG3:
275: log_level = level;
276: break;
277: default:
278: fprintf(stderr, "Unrecognized internal syslog level code %d\n",
279: (int) level);
280: exit(1);
281: }
1.2 markus 282:
1.16 markus 283: log_on_stderr = on_stderr;
284: if (on_stderr)
285: return;
286:
287: switch (facility) {
288: case SYSLOG_FACILITY_DAEMON:
289: log_facility = LOG_DAEMON;
290: break;
291: case SYSLOG_FACILITY_USER:
292: log_facility = LOG_USER;
293: break;
294: case SYSLOG_FACILITY_AUTH:
295: log_facility = LOG_AUTH;
296: break;
297: case SYSLOG_FACILITY_LOCAL0:
298: log_facility = LOG_LOCAL0;
299: break;
300: case SYSLOG_FACILITY_LOCAL1:
301: log_facility = LOG_LOCAL1;
302: break;
303: case SYSLOG_FACILITY_LOCAL2:
304: log_facility = LOG_LOCAL2;
305: break;
306: case SYSLOG_FACILITY_LOCAL3:
307: log_facility = LOG_LOCAL3;
308: break;
309: case SYSLOG_FACILITY_LOCAL4:
310: log_facility = LOG_LOCAL4;
311: break;
312: case SYSLOG_FACILITY_LOCAL5:
313: log_facility = LOG_LOCAL5;
314: break;
315: case SYSLOG_FACILITY_LOCAL6:
316: log_facility = LOG_LOCAL6;
317: break;
318: case SYSLOG_FACILITY_LOCAL7:
319: log_facility = LOG_LOCAL7;
320: break;
321: default:
322: fprintf(stderr,
323: "Unrecognized internal syslog facility code %d\n",
324: (int) facility);
325: exit(1);
326: }
1.2 markus 327: }
328:
1.16 markus 329: #define MSGBUFSIZ 1024
330:
1.22 markus 331: void
1.16 markus 332: do_log(LogLevel level, const char *fmt, va_list args)
1.2 markus 333: {
1.27 ! deraadt 334: struct syslog_data sdata = SYSLOG_DATA_INIT;
1.16 markus 335: char msgbuf[MSGBUFSIZ];
336: char fmtbuf[MSGBUFSIZ];
337: char *txt = NULL;
338: int pri = LOG_INFO;
339:
340: if (level > log_level)
341: return;
342:
343: switch (level) {
344: case SYSLOG_LEVEL_FATAL:
345: if (!log_on_stderr)
346: txt = "fatal";
347: pri = LOG_CRIT;
348: break;
349: case SYSLOG_LEVEL_ERROR:
350: if (!log_on_stderr)
351: txt = "error";
352: pri = LOG_ERR;
353: break;
354: case SYSLOG_LEVEL_INFO:
355: pri = LOG_INFO;
356: break;
357: case SYSLOG_LEVEL_VERBOSE:
358: pri = LOG_INFO;
359: break;
360: case SYSLOG_LEVEL_DEBUG1:
361: txt = "debug1";
362: pri = LOG_DEBUG;
363: break;
364: case SYSLOG_LEVEL_DEBUG2:
365: txt = "debug2";
366: pri = LOG_DEBUG;
367: break;
368: case SYSLOG_LEVEL_DEBUG3:
369: txt = "debug3";
370: pri = LOG_DEBUG;
371: break;
372: default:
373: txt = "internal error";
374: pri = LOG_ERR;
375: break;
376: }
377: if (txt != NULL) {
378: snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
379: vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
380: } else {
381: vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
382: }
383: if (log_on_stderr) {
1.27 ! deraadt 384: snprintf(fmtbuf, sizeof fmtbuf, "%s\r\n", msgbuf);
! 385: write(STDERR_FILENO, fmtbuf, strlen(fmtbuf));
1.16 markus 386: } else {
1.27 ! deraadt 387: openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
! 388: syslog_r(pri, &sdata, "%.500s", msgbuf);
! 389: closelog_r(&sdata);
1.16 markus 390: }
1.1 markus 391: }
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