Annotation of src/usr.bin/ssh/log.c, Revision 1.16
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"
1.16 ! markus 37: RCSID("$OpenBSD: log.c,v 1.15 2001/01/21 19:05:51 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:
! 88: SyslogFacility
! 89: log_facility_number(char *name)
! 90: {
! 91: int i;
! 92: if (name != NULL)
! 93: for (i = 0; log_facilities[i].name; i++)
! 94: if (strcasecmp(log_facilities[i].name, name) == 0)
! 95: return log_facilities[i].val;
! 96: return (SyslogFacility) - 1;
! 97: }
! 98:
! 99: LogLevel
! 100: log_level_number(char *name)
! 101: {
! 102: int i;
! 103: if (name != NULL)
! 104: for (i = 0; log_levels[i].name; i++)
! 105: if (strcasecmp(log_levels[i].name, name) == 0)
! 106: return log_levels[i].val;
! 107: return (LogLevel) - 1;
! 108: }
1.1 markus 109: /* Fatal messages. This function never returns. */
110:
111: void
1.4 markus 112: fatal(const char *fmt,...)
1.1 markus 113: {
1.4 markus 114: va_list args;
115: va_start(args, fmt);
116: do_log(SYSLOG_LEVEL_FATAL, fmt, args);
117: va_end(args);
118: fatal_cleanup();
1.1 markus 119: }
120:
121: /* Error messages that should be logged. */
122:
123: void
1.4 markus 124: error(const char *fmt,...)
1.1 markus 125: {
1.4 markus 126: va_list args;
127: va_start(args, fmt);
128: do_log(SYSLOG_LEVEL_ERROR, fmt, args);
129: va_end(args);
1.1 markus 130: }
131:
132: /* Log this message (information that usually should go to the log). */
133:
134: void
1.4 markus 135: log(const char *fmt,...)
1.1 markus 136: {
1.4 markus 137: va_list args;
138: va_start(args, fmt);
1.14 markus 139: do_log(SYSLOG_LEVEL_INFO, fmt, args);
1.4 markus 140: va_end(args);
1.1 markus 141: }
142:
143: /* More detailed messages (information that does not need to go to the log). */
144:
145: void
1.4 markus 146: verbose(const char *fmt,...)
1.1 markus 147: {
1.4 markus 148: va_list args;
149: va_start(args, fmt);
150: do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
151: va_end(args);
1.1 markus 152: }
153:
154: /* Debugging messages that should not be logged during normal operation. */
155:
156: void
1.4 markus 157: debug(const char *fmt,...)
1.1 markus 158: {
1.4 markus 159: va_list args;
160: va_start(args, fmt);
1.10 markus 161: do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
162: va_end(args);
163: }
164:
165: void
166: debug2(const char *fmt,...)
167: {
168: va_list args;
169: va_start(args, fmt);
170: do_log(SYSLOG_LEVEL_DEBUG2, fmt, args);
171: va_end(args);
172: }
173:
174: void
175: debug3(const char *fmt,...)
176: {
177: va_list args;
178: va_start(args, fmt);
179: do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
1.4 markus 180: va_end(args);
1.1 markus 181: }
182:
183: /* Fatal cleanup */
184:
1.4 markus 185: struct fatal_cleanup {
186: struct fatal_cleanup *next;
187: void (*proc) (void *);
188: void *context;
1.1 markus 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
1.4 markus 196: fatal_add_cleanup(void (*proc) (void *), void *context)
1.1 markus 197: {
1.4 markus 198: struct fatal_cleanup *cu;
1.1 markus 199:
1.4 markus 200: cu = xmalloc(sizeof(*cu));
201: cu->proc = proc;
202: cu->context = context;
203: cu->next = fatal_cleanups;
204: fatal_cleanups = cu;
1.1 markus 205: }
206:
207: /* Removes a cleanup frunction to be called at fatal(). */
208:
209: void
1.4 markus 210: fatal_remove_cleanup(void (*proc) (void *context), void *context)
1.1 markus 211: {
1.4 markus 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: }
1.1 markus 221: }
1.4 markus 222: fatal("fatal_remove_cleanup: no such cleanup function: 0x%lx 0x%lx\n",
1.16 ! markus 223: (u_long) proc, (u_long) context);
1.1 markus 224: }
225:
226: /* Cleanup and exit */
227: void
228: fatal_cleanup(void)
229: {
1.4 markus 230: struct fatal_cleanup *cu, *next_cu;
231: static int called = 0;
1.1 markus 232:
1.4 markus 233: if (called)
234: exit(255);
235: called = 1;
236: /* Call cleanup functions. */
237: for (cu = fatal_cleanups; cu; cu = next_cu) {
238: next_cu = cu->next;
239: debug("Calling cleanup 0x%lx(0x%lx)",
1.12 markus 240: (u_long) cu->proc, (u_long) cu->context);
1.4 markus 241: (*cu->proc) (cu->context);
242: }
243: exit(255);
1.2 markus 244: }
245:
246:
1.16 ! markus 247: /*
! 248: * Initialize the log.
! 249: */
1.2 markus 250:
1.16 ! markus 251: void
! 252: log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
1.2 markus 253: {
1.16 ! markus 254: argv0 = av0;
! 255:
! 256: switch (level) {
! 257: case SYSLOG_LEVEL_QUIET:
! 258: case SYSLOG_LEVEL_FATAL:
! 259: case SYSLOG_LEVEL_ERROR:
! 260: case SYSLOG_LEVEL_INFO:
! 261: case SYSLOG_LEVEL_VERBOSE:
! 262: case SYSLOG_LEVEL_DEBUG1:
! 263: case SYSLOG_LEVEL_DEBUG2:
! 264: case SYSLOG_LEVEL_DEBUG3:
! 265: log_level = level;
! 266: break;
! 267: default:
! 268: fprintf(stderr, "Unrecognized internal syslog level code %d\n",
! 269: (int) level);
! 270: exit(1);
! 271: }
1.2 markus 272:
1.16 ! markus 273: log_on_stderr = on_stderr;
! 274: if (on_stderr)
! 275: return;
! 276:
! 277: switch (facility) {
! 278: case SYSLOG_FACILITY_DAEMON:
! 279: log_facility = LOG_DAEMON;
! 280: break;
! 281: case SYSLOG_FACILITY_USER:
! 282: log_facility = LOG_USER;
! 283: break;
! 284: case SYSLOG_FACILITY_AUTH:
! 285: log_facility = LOG_AUTH;
! 286: break;
! 287: case SYSLOG_FACILITY_LOCAL0:
! 288: log_facility = LOG_LOCAL0;
! 289: break;
! 290: case SYSLOG_FACILITY_LOCAL1:
! 291: log_facility = LOG_LOCAL1;
! 292: break;
! 293: case SYSLOG_FACILITY_LOCAL2:
! 294: log_facility = LOG_LOCAL2;
! 295: break;
! 296: case SYSLOG_FACILITY_LOCAL3:
! 297: log_facility = LOG_LOCAL3;
! 298: break;
! 299: case SYSLOG_FACILITY_LOCAL4:
! 300: log_facility = LOG_LOCAL4;
! 301: break;
! 302: case SYSLOG_FACILITY_LOCAL5:
! 303: log_facility = LOG_LOCAL5;
! 304: break;
! 305: case SYSLOG_FACILITY_LOCAL6:
! 306: log_facility = LOG_LOCAL6;
! 307: break;
! 308: case SYSLOG_FACILITY_LOCAL7:
! 309: log_facility = LOG_LOCAL7;
! 310: break;
! 311: default:
! 312: fprintf(stderr,
! 313: "Unrecognized internal syslog facility code %d\n",
! 314: (int) facility);
! 315: exit(1);
! 316: }
1.2 markus 317: }
318:
1.16 ! markus 319: #define MSGBUFSIZ 1024
! 320:
! 321: void
! 322: do_log(LogLevel level, const char *fmt, va_list args)
1.2 markus 323: {
1.16 ! markus 324: char msgbuf[MSGBUFSIZ];
! 325: char fmtbuf[MSGBUFSIZ];
! 326: char *txt = NULL;
! 327: int pri = LOG_INFO;
! 328:
! 329: if (level > log_level)
! 330: return;
! 331:
! 332: switch (level) {
! 333: case SYSLOG_LEVEL_FATAL:
! 334: if (!log_on_stderr)
! 335: txt = "fatal";
! 336: pri = LOG_CRIT;
! 337: break;
! 338: case SYSLOG_LEVEL_ERROR:
! 339: if (!log_on_stderr)
! 340: txt = "error";
! 341: pri = LOG_ERR;
! 342: break;
! 343: case SYSLOG_LEVEL_INFO:
! 344: pri = LOG_INFO;
! 345: break;
! 346: case SYSLOG_LEVEL_VERBOSE:
! 347: pri = LOG_INFO;
! 348: break;
! 349: case SYSLOG_LEVEL_DEBUG1:
! 350: txt = "debug1";
! 351: pri = LOG_DEBUG;
! 352: break;
! 353: case SYSLOG_LEVEL_DEBUG2:
! 354: txt = "debug2";
! 355: pri = LOG_DEBUG;
! 356: break;
! 357: case SYSLOG_LEVEL_DEBUG3:
! 358: txt = "debug3";
! 359: pri = LOG_DEBUG;
! 360: break;
! 361: default:
! 362: txt = "internal error";
! 363: pri = LOG_ERR;
! 364: break;
! 365: }
! 366: if (txt != NULL) {
! 367: snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
! 368: vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
! 369: } else {
! 370: vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
! 371: }
! 372: if (log_on_stderr) {
! 373: fprintf(stderr, "%s\r\n", msgbuf);
! 374: } else {
! 375: openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
! 376: syslog(pri, "%.500s", msgbuf);
! 377: closelog();
! 378: }
1.1 markus 379: }
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