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 static const char tstr[] = "[|syslog]";
  29
  30 /*
  31  * tokenlists and #defines taken from Ethereal - Network traffic analyzer
  32  * by Gerald Combs <gerald@ethereal.com>
  33  */
  34
  35 #define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
  36 #define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
  37 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
  38
  39 static const struct tok syslog_severity_values[] = {
  40   { 0,      "emergency" },
  41   { 1,      "alert" },
  42   { 2,      "critical" },
  43   { 3,      "error" },
  44   { 4,      "warning" },
  45   { 5,      "notice" },
  46   { 6,      "info" },
  47   { 7,      "debug" },
  48   { 0, NULL },
  49 };
  50
  51 static const struct tok syslog_facility_values[] = {
  52   { 0,     "kernel" },
  53   { 1,     "user" },
  54   { 2,     "mail" },
  55   { 3,     "daemon" },
  56   { 4,     "auth" },
  57   { 5,     "syslog" },
  58   { 6,     "lpr" },
  59   { 7,     "news" },
  60   { 8,     "uucp" },
  61   { 9,     "cron" },
  62   { 10,    "authpriv" },
  63   { 11,    "ftp" },
  64   { 12,    "ntp" },
  65   { 13,    "security" },
  66   { 14,    "console" },
  67   { 15,    "cron" },
  68   { 16,    "local0" },
  69   { 17,    "local1" },
  70   { 18,    "local2" },
  71   { 19,    "local3" },
  72   { 20,    "local4" },
  73   { 21,    "local5" },
  74   { 22,    "local6" },
  75   { 23,    "local7" },
  76   { 0, NULL },
  77 };
  78
  79 void
  80 syslog_print(netdissect_options *ndo,
  81              const u_char *pptr, u_int len)
  82 {
  83     uint16_t msg_off = 0;
  84     uint16_t pri = 0;
  85     uint16_t facility,severity;
  86
  87     ndo->ndo_protocol = "syslog";
  88     /* extract decimal figures that are
  89      * encapsulated within < > tags
  90      * based on this decimal figure extract the
  91      * severity and facility values
  92      */
  93
  94     ND_TCHECK_1(pptr);
  95     if (EXTRACT_U_1(pptr + msg_off) == '<') {
  96         msg_off++;
  97         ND_TCHECK_1(pptr + msg_off);
  98         while (msg_off <= SYSLOG_MAX_DIGITS &&
  99                EXTRACT_U_1(pptr + msg_off) >= '0' &&
 100                EXTRACT_U_1(pptr + msg_off) <= '9') {
 101             pri = pri * 10 + (EXTRACT_U_1(pptr + msg_off) - '0');
 102             msg_off++;
 103             ND_TCHECK_1(pptr + msg_off);
 104         }
 105         if (EXTRACT_U_1(pptr + msg_off) != '>') {
 106             ND_PRINT("%s", tstr);
 107             return;
 108         }
 109         msg_off++;
 110     } else {
 111         ND_PRINT("%s", tstr);
 112         return;
 113     }
 114
 115     facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
 116     severity = pri & SYSLOG_SEVERITY_MASK;
 117
 118     if (ndo->ndo_vflag < 1 )
 119     {
 120         ND_PRINT("SYSLOG %s.%s, length: %u",
 121                tok2str(syslog_facility_values, "unknown (%u)", facility),
 122                tok2str(syslog_severity_values, "unknown (%u)", severity),
 123                len);
 124         return;
 125     }
 126
 127     ND_PRINT("SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
 128            len,
 129            tok2str(syslog_facility_values, "unknown (%u)", facility),
 130            facility,
 131            tok2str(syslog_severity_values, "unknown (%u)", severity),
 132            severity);
 133
 134     /* print the syslog text in verbose mode */
 135     for (; msg_off < len; msg_off++) {
 136         ND_TCHECK_1(pptr + msg_off);
 137         safeputchar(ndo, EXTRACT_U_1(pptr + msg_off));
 138     }
 139
 140     if (ndo->ndo_vflag > 1)
 141         print_unknown_data(ndo, pptr, "\n\t", len);
 142
 143     return;
 144
 145 trunc:
 146     ND_PRINT("%s", tstr);
 147 }