contrib/tcpdump/print-syslog.c

   1 /*
   2  * Copyright (c) 1998-2004  Hannes Gredler <hannes@tcpdump.org>
   3  *      The TCPDUMP project
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code
   7  * distributions retain the above copyright notice and this paragraph
   8  * in its entirety, and (2) distributions including binary code include
   9  * the above copyright notice and this paragraph in its entirety in
  10  * the documentation or other materials provided with the distribution.
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  12  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  13  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  14  * FOR A PARTICULAR PURPOSE.
  15  */
  16
  17 #ifndef lint
  18 static const char rcsid[] _U_ =
  19     "@(#) $Header: /tcpdump/master/tcpdump/print-syslog.c,v 1.1 2004-10-29 11:42:53 hannes Exp $";
  20 #endif
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34
  35 /*
  36  * tokenlists and #defines taken from Ethereal - Network traffic analyzer
  37  * by Gerald Combs <gerald@ethereal.com>
  38  */
  39
  40 #define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
  41 #define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
  42 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
  43
  44 static const struct tok syslog_severity_values[] = {
  45   { 0,      "emergency" },
  46   { 1,      "alert" },
  47   { 2,      "critical" },
  48   { 3,      "error" },
  49   { 4,      "warning" },
  50   { 5,      "notice" },
  51   { 6,      "info" },
  52   { 7,      "debug" },
  53   { 0, NULL },
  54 };
  55
  56 static const struct tok syslog_facility_values[] = {
  57   { 0,     "kernel" },
  58   { 1,     "user" },
  59   { 2,     "mail" },
  60   { 3,     "daemon" },
  61   { 4,     "auth" },
  62   { 5,     "syslog" },
  63   { 6,     "lpr" },
  64   { 7,     "news" },
  65   { 8,     "uucp" },
  66   { 9,     "cron" },
  67   { 10,    "authpriv" },
  68   { 11,    "ftp" },
  69   { 12,    "ntp" },
  70   { 13,    "security" },
  71   { 14,    "console" },
  72   { 15,    "cron" },
  73   { 16,    "local0" },
  74   { 17,    "local1" },
  75   { 18,    "local2" },
  76   { 19,    "local3" },
  77   { 20,    "local4" },
  78   { 21,    "local5" },
  79   { 22,    "local6" },
  80   { 23,    "local7" },
  81   { 0, NULL },
  82 };
  83
  84 void
  85 syslog_print(register const u_char *pptr, register u_int len)
  86 {
  87     u_int16_t msg_off = 0;
  88     u_int16_t pri = 0;
  89     u_int16_t facility,severity;
  90
  91     /* extract decimal figures that are
  92      * encapsulated within < > tags
  93      * based on this decimal figure extract the
  94      * severity and facility values
  95      */
  96
  97     if (!TTEST2(*pptr, 1))
  98         goto trunc;
  99
 100     if (*(pptr+msg_off) == '<') {
 101         msg_off++;
 102
 103         if (!TTEST2(*(pptr+msg_off), 1))
 104             goto trunc;
 105
 106         while ( *(pptr+msg_off) >= '0' &&
 107                 *(pptr+msg_off) <= '9' &&
 108                 msg_off <= SYSLOG_MAX_DIGITS) {
 109
 110             if (!TTEST2(*(pptr+msg_off), 1))
 111                 goto trunc;
 112
 113             pri = pri * 10 + (*(pptr+msg_off) - '0');
 114             msg_off++;
 115
 116             if (!TTEST2(*(pptr+msg_off), 1))
 117                 goto trunc;
 118
 119         if (*(pptr+msg_off) == '>')
 120             msg_off++;
 121         }
 122     } else {
 123         printf("[|syslog]");
 124         return;
 125     }
 126
 127     facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
 128     severity = pri & SYSLOG_SEVERITY_MASK;
 129
 130
 131     if (vflag < 1 )
 132     {
 133         printf("SYSLOG %s.%s, length: %u",
 134                tok2str(syslog_facility_values, "unknown (%u)", facility),
 135                tok2str(syslog_severity_values, "unknown (%u)", severity),
 136                len);
 137         return;
 138     }
 139
 140     printf("SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
 141            len,
 142            tok2str(syslog_facility_values, "unknown (%u)", facility),
 143            facility,
 144            tok2str(syslog_severity_values, "unknown (%u)", severity),
 145            severity);
 146
 147     /* print the syslog text in verbose mode */
 148     for (; msg_off < len; msg_off++) {
 149         if (!TTEST2(*(pptr+msg_off), 1))
 150             goto trunc;
 151         safeputchar(*(pptr+msg_off));
 152     }
 153
 154     if (vflag > 1) {
 155         if(!print_unknown_data(pptr,"\n\t",len))
 156             return;
 157     }
 158
 159     return;
 160
 161 trunc:
 162         printf("[|syslog]");
 163 }