The Tcpdump Group git mirrors - tcpdump/blob - print-syslog.c

   1 /*
   2  * Copyright (c) 1998-2004  Hannes Gredler <hannes@gredler.at>
   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 /* \summary: Syslog protocol printer */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #include "netdissect-stdinc.h"
  24
  25 #include "netdissect.h"
  26 #include "extract.h"
  27
  28
  29 /*
  30  * tokenlists and #defines taken from Ethereal - Network traffic analyzer
  31  * by Gerald Combs <gerald@ethereal.com>
  32  */
  33
  34 #define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
  35 #define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
  36 #define SYSLOG_MAX_DIGITS 3 /* The maximum number of priority digits to read in. */
  37
  38 static const struct tok syslog_severity_values[] = {
  39   { 0,      "emergency" },
  40   { 1,      "alert" },
  41   { 2,      "critical" },
  42   { 3,      "error" },
  43   { 4,      "warning" },
  44   { 5,      "notice" },
  45   { 6,      "info" },
  46   { 7,      "debug" },
  47   { 0, NULL },
  48 };
  49
  50 static const struct tok syslog_facility_values[] = {
  51   { 0,     "kernel" },
  52   { 1,     "user" },
  53   { 2,     "mail" },
  54   { 3,     "daemon" },
  55   { 4,     "auth" },
  56   { 5,     "syslog" },
  57   { 6,     "lpr" },
  58   { 7,     "news" },
  59   { 8,     "uucp" },
  60   { 9,     "cron" },
  61   { 10,    "authpriv" },
  62   { 11,    "ftp" },
  63   { 12,    "ntp" },
  64   { 13,    "security" },
  65   { 14,    "console" },
  66   { 15,    "cron" },
  67   { 16,    "local0" },
  68   { 17,    "local1" },
  69   { 18,    "local2" },
  70   { 19,    "local3" },
  71   { 20,    "local4" },
  72   { 21,    "local5" },
  73   { 22,    "local6" },
  74   { 23,    "local7" },
  75   { 0, NULL },
  76 };
  77
  78 void
  79 syslog_print(netdissect_options *ndo,
  80              const u_char *pptr, u_int len)
  81 {
  82     uint16_t msg_off = 0;
  83     uint16_t pri = 0;
  84     uint16_t facility,severity;
  85
  86     ndo->ndo_protocol = "syslog";
  87     /* extract decimal figures that are
  88      * encapsulated within < > tags
  89      * based on this decimal figure extract the
  90      * severity and facility values
  91      */
  92
  93     ND_TCHECK_1(pptr);
  94     if (GET_U_1(pptr + msg_off) == '<') {
  95         msg_off++;
  96         ND_TCHECK_1(pptr + msg_off);
  97         while (msg_off <= SYSLOG_MAX_DIGITS &&
  98                GET_U_1(pptr + msg_off) >= '0' &&
  99                GET_U_1(pptr + msg_off) <= '9') {
 100             pri = pri * 10 + (GET_U_1(pptr + msg_off) - '0');
 101             msg_off++;
 102             ND_TCHECK_1(pptr + msg_off);
 103         }
 104         if (GET_U_1(pptr + msg_off) != '>') {
 105             nd_print_trunc(ndo);
 106             return;
 107         }
 108         msg_off++;
 109     } else {
 110         nd_print_trunc(ndo);
 111         return;
 112     }
 113
 114     facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
 115     severity = pri & SYSLOG_SEVERITY_MASK;
 116
 117     if (ndo->ndo_vflag < 1 )
 118     {
 119         ND_PRINT("SYSLOG %s.%s, length: %u",
 120                tok2str(syslog_facility_values, "unknown (%u)", facility),
 121                tok2str(syslog_severity_values, "unknown (%u)", severity),
 122                len);
 123         return;
 124     }
 125
 126     ND_PRINT("SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
 127            len,
 128            tok2str(syslog_facility_values, "unknown (%u)", facility),
 129            facility,
 130            tok2str(syslog_severity_values, "unknown (%u)", severity),
 131            severity);
 132
 133     /* print the syslog text in verbose mode */
 134     for (; msg_off < len; msg_off++) {
 135         ND_TCHECK_1(pptr + msg_off);
 136         fn_print_char(ndo, GET_U_1(pptr + msg_off));
 137     }
 138
 139     if (ndo->ndo_vflag > 1)
 140         print_unknown_data(ndo, pptr, "\n\t", len);
 141
 142     return;
 143
 144 trunc:
 145     nd_print_trunc(ndo);
 146 }