Annotation of src/usr.bin/ssh/log.c, Revision 1.60
1.60 ! djm 1: /* $OpenBSD: log.c,v 1.59 2021/05/07 04:11:51 djm Exp $ */
1.1 markus 2: /*
1.9 markus 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: *
7: * As far as I am concerned, the code I have written for this software
8: * can be used freely for any purpose. Any derived versions of this
9: * software must be clearly marked as such, and if the derived work is
10: * incompatible with the protocol description in the RFC file, it must be
11: * called by a name other than "ssh" or "Secure Shell".
12: */
13: /*
1.8 deraadt 14: * Copyright (c) 2000 Markus Friedl. All rights reserved.
15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.6 markus 35: */
1.1 markus 36:
1.38 deraadt 37: #include <sys/types.h>
1.1 markus 38:
1.44 dtucker 39: #include <fcntl.h>
1.33 stevesk 40: #include <stdarg.h>
1.37 stevesk 41: #include <stdio.h>
1.36 stevesk 42: #include <stdlib.h>
1.35 stevesk 43: #include <string.h>
1.32 stevesk 44: #include <syslog.h>
1.34 stevesk 45: #include <unistd.h>
1.40 djm 46: #include <errno.h>
1.32 stevesk 47: #include <vis.h>
48:
1.15 markus 49: #include "log.h"
1.53 djm 50: #include "match.h"
1.16 markus 51:
52: static LogLevel log_level = SYSLOG_LEVEL_INFO;
53: static int log_on_stderr = 1;
1.44 dtucker 54: static int log_stderr_fd = STDERR_FILENO;
1.16 markus 55: static int log_facility = LOG_AUTH;
1.56 djm 56: static const char *argv0;
1.42 djm 57: static log_handler_fn *log_handler;
58: static void *log_handler_ctx;
1.53 djm 59: static char **log_verbose;
60: static size_t nlog_verbose;
1.16 markus 61: extern char *__progname;
62:
63: /* textual representation of log-facilities/levels */
64:
65: static struct {
66: const char *name;
67: SyslogFacility val;
68: } log_facilities[] = {
69: { "DAEMON", SYSLOG_FACILITY_DAEMON },
70: { "USER", SYSLOG_FACILITY_USER },
71: { "AUTH", SYSLOG_FACILITY_AUTH },
72: { "LOCAL0", SYSLOG_FACILITY_LOCAL0 },
73: { "LOCAL1", SYSLOG_FACILITY_LOCAL1 },
74: { "LOCAL2", SYSLOG_FACILITY_LOCAL2 },
75: { "LOCAL3", SYSLOG_FACILITY_LOCAL3 },
76: { "LOCAL4", SYSLOG_FACILITY_LOCAL4 },
77: { "LOCAL5", SYSLOG_FACILITY_LOCAL5 },
78: { "LOCAL6", SYSLOG_FACILITY_LOCAL6 },
79: { "LOCAL7", SYSLOG_FACILITY_LOCAL7 },
1.21 markus 80: { NULL, SYSLOG_FACILITY_NOT_SET }
1.16 markus 81: };
82:
83: static struct {
84: const char *name;
85: LogLevel val;
86: } log_levels[] =
87: {
88: { "QUIET", SYSLOG_LEVEL_QUIET },
89: { "FATAL", SYSLOG_LEVEL_FATAL },
90: { "ERROR", SYSLOG_LEVEL_ERROR },
91: { "INFO", SYSLOG_LEVEL_INFO },
92: { "VERBOSE", SYSLOG_LEVEL_VERBOSE },
93: { "DEBUG", SYSLOG_LEVEL_DEBUG1 },
94: { "DEBUG1", SYSLOG_LEVEL_DEBUG1 },
95: { "DEBUG2", SYSLOG_LEVEL_DEBUG2 },
96: { "DEBUG3", SYSLOG_LEVEL_DEBUG3 },
1.21 markus 97: { NULL, SYSLOG_LEVEL_NOT_SET }
1.16 markus 98: };
1.51 markus 99:
100: LogLevel
101: log_level_get(void)
102: {
103: return log_level;
104: }
1.16 markus 105:
106: SyslogFacility
107: log_facility_number(char *name)
108: {
109: int i;
1.23 deraadt 110:
1.16 markus 111: if (name != NULL)
112: for (i = 0; log_facilities[i].name; i++)
113: if (strcasecmp(log_facilities[i].name, name) == 0)
114: return log_facilities[i].val;
1.21 markus 115: return SYSLOG_FACILITY_NOT_SET;
1.16 markus 116: }
117:
1.41 dtucker 118: const char *
119: log_facility_name(SyslogFacility facility)
120: {
121: u_int i;
122:
123: for (i = 0; log_facilities[i].name; i++)
124: if (log_facilities[i].val == facility)
125: return log_facilities[i].name;
126: return NULL;
127: }
128:
1.16 markus 129: LogLevel
130: log_level_number(char *name)
131: {
132: int i;
1.23 deraadt 133:
1.16 markus 134: if (name != NULL)
135: for (i = 0; log_levels[i].name; i++)
136: if (strcasecmp(log_levels[i].name, name) == 0)
137: return log_levels[i].val;
1.21 markus 138: return SYSLOG_LEVEL_NOT_SET;
1.41 dtucker 139: }
140:
141: const char *
142: log_level_name(LogLevel level)
143: {
144: u_int i;
145:
146: for (i = 0; log_levels[i].name != NULL; i++)
147: if (log_levels[i].val == level)
148: return log_levels[i].name;
149: return NULL;
1.16 markus 150: }
1.1 markus 151:
152: void
1.53 djm 153: log_verbose_add(const char *s)
1.1 markus 154: {
1.53 djm 155: char **tmp;
1.23 deraadt 156:
1.53 djm 157: /* Ignore failures here */
158: if ((tmp = recallocarray(log_verbose, nlog_verbose, nlog_verbose + 1,
159: sizeof(*log_verbose))) != NULL) {
160: log_verbose = tmp;
161: if ((log_verbose[nlog_verbose] = strdup(s)) != NULL)
162: nlog_verbose++;
163: }
1.1 markus 164: }
1.39 deraadt 165:
166: void
1.53 djm 167: log_verbose_reset(void)
1.39 deraadt 168: {
1.53 djm 169: size_t i;
1.39 deraadt 170:
1.53 djm 171: for (i = 0; i < nlog_verbose; i++)
172: free(log_verbose[i]);
173: free(log_verbose);
174: log_verbose = NULL;
175: nlog_verbose = 0;
1.1 markus 176: }
1.2 markus 177:
1.16 markus 178: /*
179: * Initialize the log.
180: */
1.2 markus 181:
1.16 markus 182: void
1.56 djm 183: log_init(const char *av0, LogLevel level, SyslogFacility facility,
184: int on_stderr)
1.2 markus 185: {
1.16 markus 186: argv0 = av0;
187:
1.50 djm 188: if (log_change_level(level) != 0) {
1.16 markus 189: fprintf(stderr, "Unrecognized internal syslog level code %d\n",
190: (int) level);
191: exit(1);
192: }
1.2 markus 193:
1.42 djm 194: log_handler = NULL;
195: log_handler_ctx = NULL;
196:
1.16 markus 197: log_on_stderr = on_stderr;
198: if (on_stderr)
199: return;
200:
201: switch (facility) {
202: case SYSLOG_FACILITY_DAEMON:
203: log_facility = LOG_DAEMON;
204: break;
205: case SYSLOG_FACILITY_USER:
206: log_facility = LOG_USER;
207: break;
208: case SYSLOG_FACILITY_AUTH:
209: log_facility = LOG_AUTH;
210: break;
211: case SYSLOG_FACILITY_LOCAL0:
212: log_facility = LOG_LOCAL0;
213: break;
214: case SYSLOG_FACILITY_LOCAL1:
215: log_facility = LOG_LOCAL1;
216: break;
217: case SYSLOG_FACILITY_LOCAL2:
218: log_facility = LOG_LOCAL2;
219: break;
220: case SYSLOG_FACILITY_LOCAL3:
221: log_facility = LOG_LOCAL3;
222: break;
223: case SYSLOG_FACILITY_LOCAL4:
224: log_facility = LOG_LOCAL4;
225: break;
226: case SYSLOG_FACILITY_LOCAL5:
227: log_facility = LOG_LOCAL5;
228: break;
229: case SYSLOG_FACILITY_LOCAL6:
230: log_facility = LOG_LOCAL6;
231: break;
232: case SYSLOG_FACILITY_LOCAL7:
233: log_facility = LOG_LOCAL7;
234: break;
235: default:
236: fprintf(stderr,
237: "Unrecognized internal syslog facility code %d\n",
238: (int) facility);
239: exit(1);
240: }
1.43 dtucker 241: }
242:
1.50 djm 243: int
1.43 dtucker 244: log_change_level(LogLevel new_log_level)
245: {
246: /* no-op if log_init has not been called */
247: if (argv0 == NULL)
1.50 djm 248: return 0;
249:
250: switch (new_log_level) {
251: case SYSLOG_LEVEL_QUIET:
252: case SYSLOG_LEVEL_FATAL:
253: case SYSLOG_LEVEL_ERROR:
254: case SYSLOG_LEVEL_INFO:
255: case SYSLOG_LEVEL_VERBOSE:
256: case SYSLOG_LEVEL_DEBUG1:
257: case SYSLOG_LEVEL_DEBUG2:
258: case SYSLOG_LEVEL_DEBUG3:
259: log_level = new_log_level;
260: return 0;
261: default:
262: return -1;
263: }
1.43 dtucker 264: }
265:
266: int
267: log_is_on_stderr(void)
268: {
1.47 djm 269: return log_on_stderr && log_stderr_fd == STDERR_FILENO;
1.2 markus 270: }
271:
1.44 dtucker 272: /* redirect what would usually get written to stderr to specified file */
273: void
274: log_redirect_stderr_to(const char *logfile)
275: {
276: int fd;
1.52 djm 277:
278: if (logfile == NULL) {
279: if (log_stderr_fd != STDERR_FILENO) {
280: close(log_stderr_fd);
281: log_stderr_fd = STDERR_FILENO;
282: }
283: return;
284: }
1.44 dtucker 285:
286: if ((fd = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0600)) == -1) {
287: fprintf(stderr, "Couldn't open logfile %s: %s\n", logfile,
1.57 djm 288: strerror(errno));
1.44 dtucker 289: exit(1);
290: }
291: log_stderr_fd = fd;
292: }
293:
1.16 markus 294: #define MSGBUFSIZ 1024
295:
1.22 markus 296: void
1.42 djm 297: set_log_handler(log_handler_fn *handler, void *ctx)
298: {
299: log_handler = handler;
300: log_handler_ctx = ctx;
301: }
302:
1.53 djm 303: static void
1.58 markus 304: do_log(LogLevel level, int force, const char *suffix, const char *fmt,
305: va_list args)
1.2 markus 306: {
1.27 deraadt 307: struct syslog_data sdata = SYSLOG_DATA_INIT;
1.16 markus 308: char msgbuf[MSGBUFSIZ];
309: char fmtbuf[MSGBUFSIZ];
310: char *txt = NULL;
311: int pri = LOG_INFO;
1.40 djm 312: int saved_errno = errno;
1.42 djm 313: log_handler_fn *tmp_handler;
1.60 ! djm 314: const char *progname = argv0 != NULL ? argv0 : __progname;
1.16 markus 315:
1.53 djm 316: if (!force && level > log_level)
1.16 markus 317: return;
318:
319: switch (level) {
320: case SYSLOG_LEVEL_FATAL:
321: if (!log_on_stderr)
322: txt = "fatal";
323: pri = LOG_CRIT;
324: break;
325: case SYSLOG_LEVEL_ERROR:
326: if (!log_on_stderr)
327: txt = "error";
328: pri = LOG_ERR;
329: break;
330: case SYSLOG_LEVEL_INFO:
331: pri = LOG_INFO;
332: break;
333: case SYSLOG_LEVEL_VERBOSE:
334: pri = LOG_INFO;
335: break;
336: case SYSLOG_LEVEL_DEBUG1:
337: txt = "debug1";
338: pri = LOG_DEBUG;
339: break;
340: case SYSLOG_LEVEL_DEBUG2:
341: txt = "debug2";
342: pri = LOG_DEBUG;
343: break;
344: case SYSLOG_LEVEL_DEBUG3:
345: txt = "debug3";
346: pri = LOG_DEBUG;
347: break;
348: default:
349: txt = "internal error";
350: pri = LOG_ERR;
351: break;
352: }
1.42 djm 353: if (txt != NULL && log_handler == NULL) {
1.16 markus 354: snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
355: vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
356: } else {
357: vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
358: }
1.55 djm 359: if (suffix != NULL) {
360: snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", msgbuf, suffix);
361: strlcpy(msgbuf, fmtbuf, sizeof(msgbuf));
362: }
1.28 djm 363: strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE|VIS_OCTAL);
1.42 djm 364: if (log_handler != NULL) {
365: /* Avoid recursion */
366: tmp_handler = log_handler;
367: log_handler = NULL;
1.58 markus 368: tmp_handler(level, force, fmtbuf, log_handler_ctx);
1.42 djm 369: log_handler = tmp_handler;
370: } else if (log_on_stderr) {
1.60 ! djm 371: snprintf(msgbuf, sizeof msgbuf, "%s%s%.*s\r\n",
! 372: (log_on_stderr > 1) ? progname : "",
! 373: (log_on_stderr > 1) ? ": " : "",
1.49 djm 374: (int)sizeof msgbuf - 3, fmtbuf);
1.45 dtucker 375: (void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
1.16 markus 376: } else {
1.60 ! djm 377: openlog_r(progname, LOG_PID, log_facility, &sdata);
1.28 djm 378: syslog_r(pri, &sdata, "%.500s", fmtbuf);
1.27 deraadt 379: closelog_r(&sdata);
1.16 markus 380: }
1.40 djm 381: errno = saved_errno;
1.53 djm 382: }
383:
384: void
385: sshlog(const char *file, const char *func, int line, int showfunc,
1.55 djm 386: LogLevel level, const char *suffix, const char *fmt, ...)
1.53 djm 387: {
388: va_list args;
389:
390: va_start(args, fmt);
1.55 djm 391: sshlogv(file, func, line, showfunc, level, suffix, fmt, args);
1.53 djm 392: va_end(args);
393: }
394:
395: void
1.54 djm 396: sshlogdie(const char *file, const char *func, int line, int showfunc,
1.55 djm 397: LogLevel level, const char *suffix, const char *fmt, ...)
1.53 djm 398: {
399: va_list args;
400:
401: va_start(args, fmt);
1.55 djm 402: sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_INFO,
403: suffix, fmt, args);
1.53 djm 404: va_end(args);
405: cleanup_exit(255);
406: }
407:
408: void
1.54 djm 409: sshsigdie(const char *file, const char *func, int line, int showfunc,
1.55 djm 410: LogLevel level, const char *suffix, const char *fmt, ...)
1.53 djm 411: {
412: va_list args;
413:
414: va_start(args, fmt);
1.55 djm 415: sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_FATAL,
416: suffix, fmt, args);
1.53 djm 417: va_end(args);
418: _exit(1);
419: }
420:
421: void
422: sshlogv(const char *file, const char *func, int line, int showfunc,
1.55 djm 423: LogLevel level, const char *suffix, const char *fmt, va_list args)
1.53 djm 424: {
425: char tag[128], fmt2[MSGBUFSIZ + 128];
426: int forced = 0;
427: const char *cp;
428: size_t i;
429:
1.59 djm 430: snprintf(tag, sizeof(tag), "%.48s:%.48s():%d (pid=%ld)",
431: (cp = strrchr(file, '/')) == NULL ? file : cp + 1, func, line,
432: (long)getpid());
1.53 djm 433: for (i = 0; i < nlog_verbose; i++) {
434: if (match_pattern_list(tag, log_verbose[i], 0) == 1) {
435: forced = 1;
436: break;
437: }
438: }
439:
1.58 markus 440: if (forced)
1.53 djm 441: snprintf(fmt2, sizeof(fmt2), "%s: %s", tag, fmt);
442: else if (showfunc)
443: snprintf(fmt2, sizeof(fmt2), "%s: %s", func, fmt);
444: else
445: strlcpy(fmt2, fmt, sizeof(fmt2));
446:
1.58 markus 447: do_log(level, forced, suffix, fmt2, args);
448: }
449:
450: void
451: sshlogdirect(LogLevel level, int forced, const char *fmt, ...)
452: {
453: va_list args;
454:
455: va_start(args, fmt);
456: do_log(level, forced, NULL, fmt, args);
457: va_end(args);
1.1 markus 458: }
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