The Tcpdump Group git mirrors - libpcap/blob - rpcapd/log.c

   1 /*
   2  * Copyright (c) 1993, 1994, 1995, 1996, 1998
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <stdarg.h>
  28 #include <stdlib.h>
  29
  30 #ifdef _WIN32
  31 #include <windows.h>
  32 #else
  33 #include <syslog.h>
  34 #endif
  35
  36 #include "portability.h"
  37
  38 #include "log.h"
  39
  40 static int log_to_systemlog;
  41 static int log_debug_messages;
  42
  43 static void rpcapd_vlog_stderr(log_priority,
  44     PCAP_FORMAT_STRING(const char *), va_list) PCAP_PRINTFLIKE(2, 0);
  45
  46 static void rpcapd_vlog_stderr(log_priority priority, const char *message, va_list ap)
  47 {
  48         const char *tag;
  49
  50         /*
  51          * Squelch warnings from compilers that *don't* assume that
  52          * priority always has a valid enum value and therefore don't
  53          * assume that we'll always go through one of the case arms.
  54          *
  55          * If we have a default case, compilers that *do* assume that
  56          * will then complain about the default case code being
  57          * unreachable.
  58          *
  59          * Damned if you do, damned if you don't.
  60          */
  61         tag = "";
  62
  63         switch (priority) {
  64
  65         case LOGPRIO_DEBUG:
  66                 tag = "DEBUG: ";
  67                 break;
  68
  69         case LOGPRIO_INFO:
  70                 tag = "";
  71                 break;
  72
  73         case LOGPRIO_WARNING:
  74                 tag = "warning: ";
  75                 break;
  76
  77         case LOGPRIO_ERROR:
  78                 tag = "error: ";
  79                 break;
  80         }
  81
  82         fprintf(stderr, "rpcapd: %s", tag);
  83         vfprintf(stderr, message, ap);
  84         putc('\n', stderr);
  85 }
  86
  87 static void rpcapd_vlog_systemlog(log_priority,
  88     PCAP_FORMAT_STRING(const char *), va_list) PCAP_PRINTFLIKE(2, 0);
  89
  90 #ifdef _WIN32
  91 #define MESSAGE_SUBKEY \
  92     "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\rpcapd"
  93
  94 static void rpcapd_vlog_systemlog(log_priority priority, const char *message,
  95     va_list ap)
  96 {
  97 #if 0
  98         static int initialized = 0;
  99         HKEY hey_handle;
 100         static HANDLE log_handle;
 101         WORD eventlog_type;
 102         DWORD event_id;
 103         char msgbuf[1024];
 104         char *strings[1];
 105
 106         if (!initialized) {
 107                 /*
 108                  * Register our message stuff in the Registry.
 109                  *
 110                  * First, create the registry key for us.  If the key
 111                  * already exists, this succeeds and returns a handle
 112                  * for it.
 113                  */
 114                 if (RegCreateKey(HKEY_LOCAL_MACHINE, MESSAGE_SUBKEY,
 115                     &key_handle) != ERROR_SUCCESS) {
 116                         /*
 117                          * Failed - give up and just log this message,
 118                          * and all subsequent messages, to the
 119                          * standard error.
 120                          */
 121                         log_to_systemlog = 0;
 122                         initialized = 1;
 123                         rpcapd_vlog_stderr(priority, message, ap);
 124                         return;
 125                 }
 126                 log_handle = RegisterEventSource(NULL, "rpcapd");
 127                 initialized = 1;
 128         }
 129
 130         switch (priority) {
 131
 132         case LOGPRIO_DEBUG:
 133                 //
 134                 // XXX - what *should* we do about debug messages?
 135                 //
 136                 eventlog_type = EVENTLOG_INFORMATION_TYPE;
 137                 event_id = RPCAPD_INFO_ID;
 138                 break;
 139
 140         case LOGPRIO_INFO:
 141                 eventlog_type = EVENTLOG_INFORMATION_TYPE;
 142                 event_id = RPCAPD_INFO_ID;
 143                 break;
 144
 145         case LOGPRIO_WARNING:
 146                 eventlog_type = EVENTLOG_WARNING_TYPE;
 147                 event_id = RPCAPD_WARNING_ID;
 148                 break;
 149
 150         case LOGPRIO_ERROR:
 151                 eventlog_type = EVENTLOG_ERROR_TYPE;
 152                 event_id = RPCAPD_ERROR_ID;
 153                 break;
 154
 155         default:
 156                 /* Don't do this. */
 157                 return;
 158         }
 159
 160         vsprintf(msgbuf, message, ap);
 161
 162         strings[0] = msgbuf;
 163         /*
 164          * If this fails, how are we going to report it?
 165          */
 166         (void) ReportEvent(log_handle, eventlog_type, 0, event_id, NULL, 1, 0,
 167             strings, NULL);
 168 #else
 169         rpcapd_vlog_stderr(priority, message, ap);
 170 #endif
 171 }
 172 #else
 173 static void rpcapd_vlog_systemlog(log_priority priority, const char *message,
 174     va_list ap)
 175 {
 176         static int initialized = 0;
 177         int syslog_priority;
 178
 179         if (!initialized) {
 180                 //
 181                 // Open the log.
 182                 //
 183                 openlog("rpcapd", LOG_PID, LOG_DAEMON);
 184                 initialized = 1;
 185         }
 186
 187         switch (priority) {
 188
 189         case LOGPRIO_DEBUG:
 190                 syslog_priority = LOG_DEBUG;
 191                 break;
 192
 193         case LOGPRIO_INFO:
 194                 syslog_priority = LOG_INFO;
 195                 break;
 196
 197         case LOGPRIO_WARNING:
 198                 syslog_priority = LOG_WARNING;
 199                 break;
 200
 201         case LOGPRIO_ERROR:
 202                 syslog_priority = LOG_ERR;
 203                 break;
 204
 205         default:
 206                 /* Don't do this. */
 207                 return;
 208         }
 209
 210 #ifdef HAVE_VSYSLOG
 211         vsyslog(syslog_priority, message, ap);
 212 #else
 213         /*
 214          * Thanks, IBM, for not providing vsyslog() in AIX!
 215          *
 216          * They also warn that the syslog functions shouldn't
 217          * be used in multithreaded programs, but the only thing
 218          * obvious that seems to make the syslog_r functions
 219          * better is that they have an additional argument
 220          * that points to the information that's static to
 221          * the syslog code in non-thread-safe versions.  Most
 222          * of that data is set by openlog(); since we already
 223          * do an openlog before doing logging, and don't
 224          * change that data afterwards, I suspect that, in
 225          * practice, the regular syslog routines are OK for
 226          * us (especially given that we'd end up having one
 227          * static struct syslog_data anyway, which means we'd
 228          * just be like the non-thread-safe version).
 229          */
 230         char logbuf[1024+1];
 231
 232         pcap_vsnprintf(logbuf, sizeof logbuf, message, ap);
 233         syslog(syslog_priority, "%s", logbuf);
 234 #endif
 235 }
 236 #endif
 237
 238 void rpcapd_log_set(int log_to_systemlog_arg, int log_debug_messages_arg)
 239 {
 240         log_debug_messages = log_debug_messages_arg;
 241         log_to_systemlog = log_to_systemlog_arg;
 242 }
 243
 244 void rpcapd_log(log_priority priority, const char *message, ...)
 245 {
 246         va_list ap;
 247
 248         if (priority != LOGPRIO_DEBUG || log_debug_messages) {
 249                 va_start(ap, message);
 250                 if (log_to_systemlog)
 251                 {
 252                         rpcapd_vlog_systemlog(priority, message, ap);
 253                 }
 254                 else
 255                 {
 256                         rpcapd_vlog_stderr(priority, message, ap);
 257                 }
 258                 va_end(ap);
 259         }
 260 }