print-syslog.c revision 1.4 
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#if 0
20static const char rcsid[] _U_ =
21    "@(#) Header: /tcpdump/master/tcpdump/print-syslog.c,v 1.1 2004-10-29 11:42:53 hannes Exp ";
22#else
23__RCSID("$NetBSD: print-syslog.c,v 1.4 2013/12/31 17:33:31 christos Exp $");
24#endif
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <tcpdump-stdinc.h>
32
33#include <stdio.h>
34#include <stdlib.h>
35
36#include "interface.h"
37#include "extract.h"
38
39/*
40 * tokenlists and #defines taken from Ethereal - Network traffic analyzer
41 * by Gerald Combs <gerald@ethereal.com>
42 */
43
44#define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
45#define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
46#define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
47
48static const struct tok syslog_severity_values[] = {
49  { 0,      "emergency" },
50  { 1,      "alert" },
51  { 2,      "critical" },
52  { 3,      "error" },
53  { 4,      "warning" },
54  { 5,      "notice" },
55  { 6,      "info" },
56  { 7,      "debug" },
57  { 0, NULL },
58};
59
60static const struct tok syslog_facility_values[] = {
61  { 0,     "kernel" },
62  { 1,     "user" },
63  { 2,     "mail" },
64  { 3,     "daemon" },
65  { 4,     "auth" },
66  { 5,     "syslog" },
67  { 6,     "lpr" },
68  { 7,     "news" },
69  { 8,     "uucp" },
70  { 9,     "cron" },
71  { 10,    "authpriv" },
72  { 11,    "ftp" },
73  { 12,    "ntp" },
74  { 13,    "security" },
75  { 14,    "console" },
76  { 15,    "cron" },
77  { 16,    "local0" },
78  { 17,    "local1" },
79  { 18,    "local2" },
80  { 19,    "local3" },
81  { 20,    "local4" },
82  { 21,    "local5" },
83  { 22,    "local6" },
84  { 23,    "local7" },
85  { 0, NULL },
86};
87
88void
89syslog_print(register const u_char *pptr, register u_int len)
90{
91    u_int16_t msg_off = 0;
92    u_int16_t pri = 0;
93    u_int16_t facility,severity;
94
95    /* extract decimal figures that are
96     * encapsulated within < > tags
97     * based on this decimal figure extract the
98     * severity and facility values
99     */
100
101    TCHECK2(*pptr, 1);
102    if (*(pptr+msg_off) == '<') {
103        msg_off++;
104        TCHECK2(*(pptr+msg_off), 1);
105        while ( *(pptr+msg_off) >= '0' &&
106                *(pptr+msg_off) <= '9' &&
107                msg_off <= SYSLOG_MAX_DIGITS) {
108            pri = pri * 10 + (*(pptr+msg_off) - '0');
109            msg_off++;
110            TCHECK2(*(pptr+msg_off), 1);
111        }
112        if (*(pptr+msg_off) != '>') {
113            printf("[|syslog]");
114            return;
115        }
116        msg_off++;
117    } else {
118        printf("[|syslog]");
119        return;
120    }
121
122    facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
123    severity = pri & SYSLOG_SEVERITY_MASK;
124
125    if (vflag < 1 )
126    {
127        printf("SYSLOG %s.%s, length: %u",
128               tok2str(syslog_facility_values, "unknown (%u)", facility),
129               tok2str(syslog_severity_values, "unknown (%u)", severity),
130               len);
131        return;
132    }
133
134    printf("SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
135           len,
136           tok2str(syslog_facility_values, "unknown (%u)", facility),
137           facility,
138           tok2str(syslog_severity_values, "unknown (%u)", severity),
139           severity);
140
141    /* print the syslog text in verbose mode */
142    for (; msg_off < len; msg_off++) {
143        TCHECK2(*(pptr+msg_off), 1);
144        safeputchar(*(pptr+msg_off));
145    }
146
147    if (vflag > 1)
148        print_unknown_data(pptr,"\n\t",len);
149
150    return;
151
152trunc:
153        printf("[|syslog]");
154}
155