crypto/openssh-3.8.1p1/log.c

   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 1.29 2003/09/23 20:17:11 markus Exp $");
  38
  39 #include "log.h"
  40 #include "xmalloc.h"
  41
  42 #include <syslog.h>
  43 #if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
  44 # include <vis.h>
  45 #endif
  46
  47 static LogLevel log_level = SYSLOG_LEVEL_INFO;
  48 static int log_on_stderr = 1;
  49 static int log_facility = LOG_AUTH;
  50 static char *argv0;
  51
  52 extern char *__progname;
  53
  54 /* textual representation of log-facilities/levels */
  55
  56 static struct {
  57         const char *name;
  58         SyslogFacility val;
  59 } log_facilities[] = {
  60         { "DAEMON",     SYSLOG_FACILITY_DAEMON },
  61         { "USER",       SYSLOG_FACILITY_USER },
  62         { "AUTH",       SYSLOG_FACILITY_AUTH },
  63 #ifdef LOG_AUTHPRIV
  64         { "AUTHPRIV",   SYSLOG_FACILITY_AUTHPRIV },
  65 #endif
  66         { "LOCAL0",     SYSLOG_FACILITY_LOCAL0 },
  67         { "LOCAL1",     SYSLOG_FACILITY_LOCAL1 },
  68         { "LOCAL2",     SYSLOG_FACILITY_LOCAL2 },
  69         { "LOCAL3",     SYSLOG_FACILITY_LOCAL3 },
  70         { "LOCAL4",     SYSLOG_FACILITY_LOCAL4 },
  71         { "LOCAL5",     SYSLOG_FACILITY_LOCAL5 },
  72         { "LOCAL6",     SYSLOG_FACILITY_LOCAL6 },
  73         { "LOCAL7",     SYSLOG_FACILITY_LOCAL7 },
  74         { NULL,         SYSLOG_FACILITY_NOT_SET }
  75 };
  76
  77 static struct {
  78         const char *name;
  79         LogLevel val;
  80 } log_levels[] =
  81 {
  82         { "QUIET",      SYSLOG_LEVEL_QUIET },
  83         { "FATAL",      SYSLOG_LEVEL_FATAL },
  84         { "ERROR",      SYSLOG_LEVEL_ERROR },
  85         { "INFO",       SYSLOG_LEVEL_INFO },
  86         { "VERBOSE",    SYSLOG_LEVEL_VERBOSE },
  87         { "DEBUG",      SYSLOG_LEVEL_DEBUG1 },
  88         { "DEBUG1",     SYSLOG_LEVEL_DEBUG1 },
  89         { "DEBUG2",     SYSLOG_LEVEL_DEBUG2 },
  90         { "DEBUG3",     SYSLOG_LEVEL_DEBUG3 },
  91         { NULL,         SYSLOG_LEVEL_NOT_SET }
  92 };
  93
  94 SyslogFacility
  95 log_facility_number(char *name)
  96 {
  97         int i;
  98
  99         if (name != NULL)
 100                 for (i = 0; log_facilities[i].name; i++)
 101                         if (strcasecmp(log_facilities[i].name, name) == 0)
 102                                 return log_facilities[i].val;
 103         return SYSLOG_FACILITY_NOT_SET;
 104 }
 105
 106 LogLevel
 107 log_level_number(char *name)
 108 {
 109         int i;
 110
 111         if (name != NULL)
 112                 for (i = 0; log_levels[i].name; i++)
 113                         if (strcasecmp(log_levels[i].name, name) == 0)
 114                                 return log_levels[i].val;
 115         return SYSLOG_LEVEL_NOT_SET;
 116 }
 117
 118 /* Error messages that should be logged. */
 119
 120 void
 121 error(const char *fmt,...)
 122 {
 123         va_list args;
 124
 125         va_start(args, fmt);
 126         do_log(SYSLOG_LEVEL_ERROR, fmt, args);
 127         va_end(args);
 128 }
 129
 130 /* Log this message (information that usually should go to the log). */
 131
 132 void
 133 logit(const char *fmt,...)
 134 {
 135         va_list args;
 136
 137         va_start(args, fmt);
 138         do_log(SYSLOG_LEVEL_INFO, fmt, args);
 139         va_end(args);
 140 }
 141
 142 /* More detailed messages (information that does not need to go to the log). */
 143
 144 void
 145 verbose(const char *fmt,...)
 146 {
 147         va_list args;
 148
 149         va_start(args, fmt);
 150         do_log(SYSLOG_LEVEL_VERBOSE, fmt, args);
 151         va_end(args);
 152 }
 153
 154 /* Debugging messages that should not be logged during normal operation. */
 155
 156 void
 157 debug(const char *fmt,...)
 158 {
 159         va_list args;
 160
 161         va_start(args, fmt);
 162         do_log(SYSLOG_LEVEL_DEBUG1, fmt, args);
 163         va_end(args);
 164 }
 165
 166 void
 167 debug2(const char *fmt,...)
 168 {
 169         va_list args;
 170
 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
 181         va_start(args, fmt);
 182         do_log(SYSLOG_LEVEL_DEBUG3, fmt, args);
 183         va_end(args);
 184 }
 185
 186 /*
 187  * Initialize the log.
 188  */
 189
 190 void
 191 log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr)
 192 {
 193         argv0 = av0;
 194
 195         switch (level) {
 196         case SYSLOG_LEVEL_QUIET:
 197         case SYSLOG_LEVEL_FATAL:
 198         case SYSLOG_LEVEL_ERROR:
 199         case SYSLOG_LEVEL_INFO:
 200         case SYSLOG_LEVEL_VERBOSE:
 201         case SYSLOG_LEVEL_DEBUG1:
 202         case SYSLOG_LEVEL_DEBUG2:
 203         case SYSLOG_LEVEL_DEBUG3:
 204                 log_level = level;
 205                 break;
 206         default:
 207                 fprintf(stderr, "Unrecognized internal syslog level code %d\n",
 208                     (int) level);
 209                 exit(1);
 210         }
 211
 212         log_on_stderr = on_stderr;
 213         if (on_stderr)
 214                 return;
 215
 216         switch (facility) {
 217         case SYSLOG_FACILITY_DAEMON:
 218                 log_facility = LOG_DAEMON;
 219                 break;
 220         case SYSLOG_FACILITY_USER:
 221                 log_facility = LOG_USER;
 222                 break;
 223         case SYSLOG_FACILITY_AUTH:
 224                 log_facility = LOG_AUTH;
 225                 break;
 226 #ifdef LOG_AUTHPRIV
 227         case SYSLOG_FACILITY_AUTHPRIV:
 228                 log_facility = LOG_AUTHPRIV;
 229                 break;
 230 #endif
 231         case SYSLOG_FACILITY_LOCAL0:
 232                 log_facility = LOG_LOCAL0;
 233                 break;
 234         case SYSLOG_FACILITY_LOCAL1:
 235                 log_facility = LOG_LOCAL1;
 236                 break;
 237         case SYSLOG_FACILITY_LOCAL2:
 238                 log_facility = LOG_LOCAL2;
 239                 break;
 240         case SYSLOG_FACILITY_LOCAL3:
 241                 log_facility = LOG_LOCAL3;
 242                 break;
 243         case SYSLOG_FACILITY_LOCAL4:
 244                 log_facility = LOG_LOCAL4;
 245                 break;
 246         case SYSLOG_FACILITY_LOCAL5:
 247                 log_facility = LOG_LOCAL5;
 248                 break;
 249         case SYSLOG_FACILITY_LOCAL6:
 250                 log_facility = LOG_LOCAL6;
 251                 break;
 252         case SYSLOG_FACILITY_LOCAL7:
 253                 log_facility = LOG_LOCAL7;
 254                 break;
 255         default:
 256                 fprintf(stderr,
 257                     "Unrecognized internal syslog facility code %d\n",
 258                     (int) facility);
 259                 exit(1);
 260         }
 261 }
 262
 263 #define MSGBUFSIZ 1024
 264
 265 void
 266 do_log(LogLevel level, const char *fmt, va_list args)
 267 {
 268 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
 269         struct syslog_data sdata = SYSLOG_DATA_INIT;
 270 #endif
 271         char msgbuf[MSGBUFSIZ];
 272         char fmtbuf[MSGBUFSIZ];
 273         char *txt = NULL;
 274         int pri = LOG_INFO;
 275
 276         if (level > log_level)
 277                 return;
 278
 279         switch (level) {
 280         case SYSLOG_LEVEL_FATAL:
 281                 if (!log_on_stderr)
 282                         txt = "fatal";
 283                 pri = LOG_CRIT;
 284                 break;
 285         case SYSLOG_LEVEL_ERROR:
 286                 if (!log_on_stderr)
 287                         txt = "error";
 288                 pri = LOG_ERR;
 289                 break;
 290         case SYSLOG_LEVEL_INFO:
 291                 pri = LOG_INFO;
 292                 break;
 293         case SYSLOG_LEVEL_VERBOSE:
 294                 pri = LOG_INFO;
 295                 break;
 296         case SYSLOG_LEVEL_DEBUG1:
 297                 txt = "debug1";
 298                 pri = LOG_DEBUG;
 299                 break;
 300         case SYSLOG_LEVEL_DEBUG2:
 301                 txt = "debug2";
 302                 pri = LOG_DEBUG;
 303                 break;
 304         case SYSLOG_LEVEL_DEBUG3:
 305                 txt = "debug3";
 306                 pri = LOG_DEBUG;
 307                 break;
 308         default:
 309                 txt = "internal error";
 310                 pri = LOG_ERR;
 311                 break;
 312         }
 313         if (txt != NULL) {
 314                 snprintf(fmtbuf, sizeof(fmtbuf), "%s: %s", txt, fmt);
 315                 vsnprintf(msgbuf, sizeof(msgbuf), fmtbuf, args);
 316         } else {
 317                 vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
 318         }
 319         strnvis(fmtbuf, msgbuf, sizeof(fmtbuf), VIS_SAFE|VIS_OCTAL);
 320         if (log_on_stderr) {
 321                 snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
 322                 write(STDERR_FILENO, msgbuf, strlen(msgbuf));
 323         } else {
 324 #if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
 325                 openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
 326                 syslog_r(pri, &sdata, "%.500s", fmtbuf);
 327                 closelog_r(&sdata);
 328 #else
 329                 openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
 330                 syslog(pri, "%.500s", fmtbuf);
 331                 closelog();
 332 #endif
 333         }
 334 }