external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  18 #ifndef lint
  19 __RCSID("$NetBSD: print-syslog.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
  20 #endif
  21
  22 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include "interface.h"
  30 #include "extract.h"
  31
  32 static const char tstr[] = "[|syslog]";
  33
  34 /*
  35  * tokenlists and #defines taken from Ethereal - Network traffic analyzer
  36  * by Gerald Combs <gerald@ethereal.com>
  37  */
  38
  39 #define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
  40 #define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
  41 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
  42
  43 static const struct tok syslog_severity_values[] = {
  44   { 0,      "emergency" },
  45   { 1,      "alert" },
  46   { 2,      "critical" },
  47   { 3,      "error" },
  48   { 4,      "warning" },
  49   { 5,      "notice" },
  50   { 6,      "info" },
  51   { 7,      "debug" },
  52   { 0, NULL },
  53 };
  54
  55 static const struct tok syslog_facility_values[] = {
  56   { 0,     "kernel" },
  57   { 1,     "user" },
  58   { 2,     "mail" },
  59   { 3,     "daemon" },
  60   { 4,     "auth" },
  61   { 5,     "syslog" },
  62   { 6,     "lpr" },
  63   { 7,     "news" },
  64   { 8,     "uucp" },
  65   { 9,     "cron" },
  66   { 10,    "authpriv" },
  67   { 11,    "ftp" },
  68   { 12,    "ntp" },
  69   { 13,    "security" },
  70   { 14,    "console" },
  71   { 15,    "cron" },
  72   { 16,    "local0" },
  73   { 17,    "local1" },
  74   { 18,    "local2" },
  75   { 19,    "local3" },
  76   { 20,    "local4" },
  77   { 21,    "local5" },
  78   { 22,    "local6" },
  79   { 23,    "local7" },
  80   { 0, NULL },
  81 };
  82
  83 void
  84 syslog_print(netdissect_options *ndo,
  85              register const u_char *pptr, register u_int len)
  86 {
  87     uint16_t msg_off = 0;
  88     uint16_t pri = 0;
  89     uint16_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     ND_TCHECK2(*pptr, 1);
  98     if (*(pptr+msg_off) == '<') {
  99         msg_off++;
 100         ND_TCHECK2(*(pptr + msg_off), 1);
 101         while ( *(pptr+msg_off) >= '0' &&
 102                 *(pptr+msg_off) <= '9' &&
 103                 msg_off <= SYSLOG_MAX_DIGITS) {
 104             pri = pri * 10 + (*(pptr+msg_off) - '0');
 105             msg_off++;
 106             ND_TCHECK2(*(pptr + msg_off), 1);
 107         }
 108         if (*(pptr+msg_off) != '>') {
 109             ND_PRINT((ndo, "%s", tstr));
 110             return;
 111         }
 112         msg_off++;
 113     } else {
 114         ND_PRINT((ndo, "%s", tstr));
 115         return;
 116     }
 117
 118     facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
 119     severity = pri & SYSLOG_SEVERITY_MASK;
 120
 121     if (ndo->ndo_vflag < 1 )
 122     {
 123         ND_PRINT((ndo, "SYSLOG %s.%s, length: %u",
 124                tok2str(syslog_facility_values, "unknown (%u)", facility),
 125                tok2str(syslog_severity_values, "unknown (%u)", severity),
 126                len));
 127         return;
 128     }
 129
 130     ND_PRINT((ndo, "SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
 131            len,
 132            tok2str(syslog_facility_values, "unknown (%u)", facility),
 133            facility,
 134            tok2str(syslog_severity_values, "unknown (%u)", severity),
 135            severity));
 136
 137     /* print the syslog text in verbose mode */
 138     for (; msg_off < len; msg_off++) {
 139         ND_TCHECK2(*(pptr + msg_off), 1);
 140         safeputchar(ndo, *(pptr + msg_off));
 141     }
 142
 143     if (ndo->ndo_vflag > 1)
 144         print_unknown_data(ndo, pptr, "\n\t", len);
 145
 146     return;
 147
 148 trunc:
 149     ND_PRINT((ndo, "%s", tstr));
 150 }