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#ifndef lint
18static const char rcsid[] _U_ =
19    "@(#) $Header: /tcpdump/master/tcpdump/print-syslog.c,v 1.1 2004-10-29 11:42:53 hannes Exp $";
20#endif
21
22#ifdef HAVE_CONFIG_H
23#include "config.h"
24#endif
25
26#include <tcpdump-stdinc.h>
27
28#include <stdio.h>
29#include <stdlib.h>
30
31#include "interface.h"
32#include "extract.h"
33#include "addrtoname.h"
34
35/*
36 * tokenlists and #defines taken from Ethereal - Network traffic analyzer
37 * by Gerald Combs <gerald@ethereal.com>
38 */
39
40#define SYSLOG_SEVERITY_MASK 0x0007  /* 0000 0000 0000 0111 */
41#define SYSLOG_FACILITY_MASK 0x03f8  /* 0000 0011 1111 1000 */
42#define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */
43
44static const struct tok syslog_severity_values[] = {
45  { 0,      "emergency" },
46  { 1,      "alert" },
47  { 2,      "critical" },
48  { 3,      "error" },
49  { 4,      "warning" },
50  { 5,      "notice" },
51  { 6,      "info" },
52  { 7,      "debug" },
53  { 0, NULL },
54};
55
56static const struct tok syslog_facility_values[] = {
57  { 0,     "kernel" },
58  { 1,     "user" },
59  { 2,     "mail" },
60  { 3,     "daemon" },
61  { 4,     "auth" },
62  { 5,     "syslog" },
63  { 6,     "lpr" },
64  { 7,     "news" },
65  { 8,     "uucp" },
66  { 9,     "cron" },
67  { 10,    "authpriv" },
68  { 11,    "ftp" },
69  { 12,    "ntp" },
70  { 13,    "security" },
71  { 14,    "console" },
72  { 15,    "cron" },
73  { 16,    "local0" },
74  { 17,    "local1" },
75  { 18,    "local2" },
76  { 19,    "local3" },
77  { 20,    "local4" },
78  { 21,    "local5" },
79  { 22,    "local6" },
80  { 23,    "local7" },
81  { 0, NULL },
82};
83
84void
85syslog_print(register const u_char *pptr, register u_int len)
86{
87    u_int16_t msg_off = 0;
88    u_int16_t pri = 0;
89    u_int16_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    if (!TTEST2(*pptr, 1))
98        goto trunc;
99
100    if (*(pptr+msg_off) == '<') {
101        msg_off++;
102
103        if (!TTEST2(*(pptr+msg_off), 1))
104            goto trunc;
105
106        while ( *(pptr+msg_off) >= '0' &&
107                *(pptr+msg_off) <= '9' &&
108                msg_off <= SYSLOG_MAX_DIGITS) {
109
110            if (!TTEST2(*(pptr+msg_off), 1))
111                goto trunc;
112
113            pri = pri * 10 + (*(pptr+msg_off) - '0');
114            msg_off++;
115
116            if (!TTEST2(*(pptr+msg_off), 1))
117                goto trunc;
118
119        if (*(pptr+msg_off) == '>')
120            msg_off++;
121        }
122    } else {
123        printf("[|syslog]");
124        return;
125    }
126
127    facility = (pri & SYSLOG_FACILITY_MASK) >> 3;
128    severity = pri & SYSLOG_SEVERITY_MASK;
129
130
131    if (vflag < 1 )
132    {
133        printf("SYSLOG %s.%s, length: %u",
134               tok2str(syslog_facility_values, "unknown (%u)", facility),
135               tok2str(syslog_severity_values, "unknown (%u)", severity),
136               len);
137        return;
138    }
139
140    printf("SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ",
141           len,
142           tok2str(syslog_facility_values, "unknown (%u)", facility),
143           facility,
144           tok2str(syslog_severity_values, "unknown (%u)", severity),
145           severity);
146
147    /* print the syslog text in verbose mode */
148    for (; msg_off < len; msg_off++) {
149        if (!TTEST2(*(pptr+msg_off), 1))
150            goto trunc;
151        safeputchar(*(pptr+msg_off));
152    }
153
154    if (vflag > 1) {
155        if(!print_unknown_data(pptr,"\n\t",len))
156            return;
157    }
158
159    return;
160
161trunc:
162        printf("[|syslog]");
163}
164