1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* \summary: OpenBSD packet filter log file printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef HAVE_NET_PFVAR_H
#error "No pf headers available"
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/pfvar.h>
#include <net/if_pflog.h>
#include <netdissect-stdinc.h>
#include "netdissect.h"
#include "extract.h"
static const char tstr[] = "[|pflog]";
static const struct tok pf_reasons[] = {
{ 0, "0(match)" },
{ 1, "1(bad-offset)" },
{ 2, "2(fragment)" },
{ 3, "3(short)" },
{ 4, "4(normalize)" },
{ 5, "5(memory)" },
{ 6, "6(bad-timestamp)" },
{ 7, "7(congestion)" },
{ 8, "8(ip-option)" },
{ 9, "9(proto-cksum)" },
{ 10, "10(state-mismatch)" },
{ 11, "11(state-insert)" },
{ 12, "12(state-limit)" },
{ 13, "13(src-limit)" },
{ 14, "14(synproxy)" },
{ 0, NULL }
};
static const struct tok pf_actions[] = {
{ PF_PASS, "pass" },
{ PF_DROP, "block" },
{ PF_SCRUB, "scrub" },
{ PF_NAT, "nat" },
{ PF_NONAT, "nat" },
{ PF_BINAT, "binat" },
{ PF_NOBINAT, "binat" },
{ PF_RDR, "rdr" },
{ PF_NORDR, "rdr" },
{ PF_SYNPROXY_DROP, "synproxy-drop" },
{ 0, NULL }
};
static const struct tok pf_directions[] = {
{ PF_INOUT, "in/out" },
{ PF_IN, "in" },
{ PF_OUT, "out" },
{ 0, NULL }
};
/* For reading capture files on other systems */
#define OPENBSD_AF_INET 2
#define OPENBSD_AF_INET6 24
static void
pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
{
uint32_t rulenr, subrulenr;
rulenr = EXTRACT_32BITS(&hdr->rulenr);
subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
if (subrulenr == (uint32_t)-1)
ND_PRINT((ndo, "rule %u/", rulenr));
else
ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
ND_PRINT((ndo, "%s: %s %s on %s: ",
tok2str(pf_reasons, "unkn(%u)", hdr->reason),
tok2str(pf_actions, "unkn(%u)", hdr->action),
tok2str(pf_directions, "unkn(%u)", hdr->dir),
hdr->ifname));
}
u_int
pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
register const u_char *p)
{
u_int length = h->len;
u_int hdrlen;
u_int caplen = h->caplen;
const struct pfloghdr *hdr;
uint8_t af;
/* check length */
if (caplen < sizeof(uint8_t)) {
ND_PRINT((ndo, "%s", tstr));
return (caplen);
}
#define MIN_PFLOG_HDRLEN 45
hdr = (const struct pfloghdr *)p;
if (hdr->length < MIN_PFLOG_HDRLEN) {
ND_PRINT((ndo, "[pflog: invalid header length!]"));
return (hdr->length); /* XXX: not really */
}
hdrlen = BPF_WORDALIGN(hdr->length);
if (caplen < hdrlen) {
ND_PRINT((ndo, "%s", tstr));
return (hdrlen); /* XXX: true? */
}
/* print what we know */
ND_TCHECK(*hdr);
if (ndo->ndo_eflag)
pflog_print(ndo, hdr);
/* skip to the real packet */
af = hdr->af;
length -= hdrlen;
caplen -= hdrlen;
p += hdrlen;
switch (af) {
case AF_INET:
#if OPENBSD_AF_INET != AF_INET
case OPENBSD_AF_INET: /* XXX: read pcap files */
#endif
ip_print(ndo, p, length);
break;
#if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
#ifdef AF_INET6
case AF_INET6:
#endif /* AF_INET6 */
#if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
case OPENBSD_AF_INET6: /* XXX: read pcap files */
#endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
ip6_print(ndo, p, length);
break;
#endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
default:
/* address family not handled, print raw packet */
if (!ndo->ndo_eflag)
pflog_print(ndo, hdr);
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
}
return (hdrlen);
trunc:
ND_PRINT((ndo, "%s", tstr));
return (hdrlen);
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 8
* End:
*/
|
