The Tcpdump Group git mirrors - tcpdump/blob - 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 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <netdissect-stdinc.h>
  22
  23 #include "netdissect.h"
  24 #include "extract.h"
  25
  26 static const char tstr[] = "[|syslog]";
  27
  28 /*
  29  * tokenlists and #defines taken from Ethereal - Network traffic analyzer
  30  * by Gerald Combs <gerald@ethereal.com>
  31  */
  32
  33 #define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
  34 #define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
  35 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
  36
  37 static const struct tok syslog_severity_values[] = {
  38   { 0,      "emergency" },
  39   { 1,      "alert" },
  40   { 2,      "critical" },
  41   { 3,      "error" },
  42   { 4,      "warning" },
  43   { 5,      "notice" },
  44   { 6,      "info" },
  45   { 7,      "debug" },
  46   { 0, NULL },
  47 };
  48
  49 static const struct tok syslog_facility_values[] = {
  50   { 0,     "kernel" },
  51   { 1,     "user" },
  52   { 2,     "mail" },
  53   { 3,     "daemon" },
  54   { 4,     "auth" },
  55   { 5,     "syslog" },
  56   { 6,     "lpr" },
  57   { 7,     "news" },
  58   { 8,     "uucp" },
  59   { 9,     "cron" },
  60   { 10,    "authpriv" },
  61   { 11,    "ftp" },
  62   { 12,    "ntp" },
  63   { 13,    "security" },
  64   { 14,    "console" },
  65   { 15,    "cron" },
  66   { 16,    "local0" },
  67   { 17,    "local1" },
  68   { 18,    "local2" },
  69   { 19,    "local3" },
  70   { 20,    "local4" },
  71   { 21,    "local5" },
  72   { 22,    "local6" },
  73   { 23,    "local7" },
  74   { 0, NULL },
  75 };
  76
  77 void
  78 syslog_print(netdissect_options *ndo,
  79              register const u_char *pptr, register u_int len)
  80 {
  81     uint16_t msg_off = 0;
  82     uint16_t pri = 0;
  83     uint16_t facility,severity;
  84
  85     /* extract decimal figures that are
  86      * encapsulated within < > tags
  87      * based on this decimal figure extract the
  88      * severity and facility values
  89      */
  90
  91     ND_TCHECK2(*pptr, 1);
  92     if (*(pptr+msg_off) == '<') {
  93         msg_off++;
  94         ND_TCHECK2(*(pptr + msg_off), 1);
  95         while ( *(pptr+msg_off) >= '0' &&
  96                 *(pptr+msg_off) <= '9' &&
  97                 msg_off <= SYSLOG_MAX_DIGITS) {
  98             pri = pri * 10 + (*(pptr+msg_off) - '0');
  99             msg_off++;
 100             ND_TCHECK2(*(pptr + msg_off), 1);
 101         }
 102         if (*(pptr+msg_off) != '>') {
 103             ND_PRINT((ndo, "%s", tstr));
 104             return;
 105         }
 106         msg_off++;
 107     } else {
 108         ND_PRINT((ndo, "%s", tstr));
 109         return;
 110     }
 111
 112     facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
 113     severity = pri & SYSLOG_SEVERITY_MASK;
 114
 115     if (ndo->ndo_vflag < 1 )
 116     {
 117         ND_PRINT((ndo, "SYSLOG %s.%s, length: %u",
 118                tok2str(syslog_facility_values, "unknown (%u)", facility),
 119                tok2str(syslog_severity_values, "unknown (%u)", severity),
 120                len));
 121         return;
 122     }
 123
 124     ND_PRINT((ndo, "SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
 125            len,
 126            tok2str(syslog_facility_values, "unknown (%u)", facility),
 127            facility,
 128            tok2str(syslog_severity_values, "unknown (%u)", severity),
 129            severity));
 130
 131     /* print the syslog text in verbose mode */
 132     for (; msg_off < len; msg_off++) {
 133         ND_TCHECK2(*(pptr + msg_off), 1);
 134         safeputchar(ndo, *(pptr + msg_off));
 135     }
 136
 137     if (ndo->ndo_vflag > 1)
 138         print_unknown_data(ndo, pptr, "\n\t", len);
 139
 140     return;
 141
 142 trunc:
 143     ND_PRINT((ndo, "%s", tstr));
 144 }