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
28static 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
39static 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
51static 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
79void
80syslog_print(netdissect_options *ndo,
81             register const u_char *pptr, register u_int len)
82{
83    uint16_t msg_off = 0;
84    uint16_t pri = 0;
85    uint16_t facility,severity;
86
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_TCHECK2(*pptr, 1);
94    if (*(pptr+msg_off) == '<') {
95        msg_off++;
96        ND_TCHECK2(*(pptr + msg_off), 1);
97        while ( *(pptr+msg_off) >= '0' &&
98                *(pptr+msg_off) <= '9' &&
99                msg_off <= SYSLOG_MAX_DIGITS) {
100            pri = pri * 10 + (*(pptr+msg_off) - '0');
101            msg_off++;
102            ND_TCHECK2(*(pptr + msg_off), 1);
103        }
104        if (*(pptr+msg_off) != '>') {
105            ND_PRINT((ndo, "%s", tstr));
106            return;
107        }
108        msg_off++;
109    } else {
110        ND_PRINT((ndo, "%s", tstr));
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((ndo, "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((ndo, "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_TCHECK2(*(pptr + msg_off), 1);
136        safeputchar(ndo, *(pptr + msg_off));
137    }
138
139    if (ndo->ndo_vflag > 1)
140        print_unknown_data(ndo, pptr, "\n\t", len);
141
142    return;
143
144trunc:
145    ND_PRINT((ndo, "%s", tstr));
146}
147