print-syslog.c revision 1.5 
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
32static 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
43static 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
55static 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
83void
84syslog_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
148trunc:
149    ND_PRINT((ndo, "%s", tstr));
150}
151