1 /*
2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 #ifndef lint
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-pflog.c,v 1.16 2007-09-12 19:36:18 guy Exp $ (LBL)";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #ifndef HAVE_NET_PFVAR_H
32 #error "No pf headers available"
33 #endif
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <net/if.h>
37 #include <net/pfvar.h>
38 #include <net/if_pflog.h>
39
40 #include <tcpdump-stdinc.h>
41
42 #include <stdio.h>
43 #include <pcap.h>
44
45 #include "extract.h"
46 #include "interface.h"
47 #include "addrtoname.h"
48
49 static const struct tok pf_reasons[] = {
50 { 0, "0(match)" },
51 { 1, "1(bad-offset)" },
52 { 2, "2(fragment)" },
53 { 3, "3(short)" },
54 { 4, "4(normalize)" },
55 { 5, "5(memory)" },
56 { 6, "6(bad-timestamp)" },
57 { 7, "7(congestion)" },
58 { 8, "8(ip-option)" },
59 { 9, "9(proto-cksum)" },
60 { 10, "10(state-mismatch)" },
61 { 11, "11(state-insert)" },
62 { 12, "12(state-limit)" },
63 { 13, "13(src-limit)" },
64 { 14, "14(synproxy)" },
65 { 0, NULL }
66 };
67
68 static const struct tok pf_actions[] = {
69 { PF_PASS, "pass" },
70 { PF_DROP, "block" },
71 { PF_SCRUB, "scrub" },
72 { PF_NAT, "nat" },
73 { PF_NONAT, "nat" },
74 { PF_BINAT, "binat" },
75 { PF_NOBINAT, "binat" },
76 { PF_RDR, "rdr" },
77 { PF_NORDR, "rdr" },
78 { PF_SYNPROXY_DROP, "synproxy-drop" },
79 { 0, NULL }
80 };
81
82 static const struct tok pf_directions[] = {
83 { PF_INOUT, "in/out" },
84 { PF_IN, "in" },
85 { PF_OUT, "out" },
86 { 0, NULL }
87 };
88
89 /* For reading capture files on other systems */
90 #define OPENBSD_AF_INET 2
91 #define OPENBSD_AF_INET6 24
92
93 static void
pflog_print(const struct pfloghdr * hdr)94 pflog_print(const struct pfloghdr *hdr)
95 {
96 u_int32_t rulenr, subrulenr;
97
98 rulenr = EXTRACT_32BITS(&hdr->rulenr);
99 subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
100 if (subrulenr == (u_int32_t)-1)
101 printf("rule %u/", rulenr);
102 else
103 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
104
105 printf("%s: %s %s on %s: ",
106 tok2str(pf_reasons, "unkn(%u)", hdr->reason),
107 tok2str(pf_actions, "unkn(%u)", hdr->action),
108 tok2str(pf_directions, "unkn(%u)", hdr->dir),
109 hdr->ifname);
110 }
111
112 u_int
pflog_if_print(const struct pcap_pkthdr * h,register const u_char * p)113 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
114 {
115 u_int length = h->len;
116 u_int hdrlen;
117 u_int caplen = h->caplen;
118 const struct pfloghdr *hdr;
119 u_int8_t af;
120
121 /* check length */
122 if (caplen < sizeof(u_int8_t)) {
123 printf("[|pflog]");
124 return (caplen);
125 }
126
127 #define MIN_PFLOG_HDRLEN 45
128 hdr = (struct pfloghdr *)p;
129 if (hdr->length < MIN_PFLOG_HDRLEN) {
130 printf("[pflog: invalid header length!]");
131 return (hdr->length); /* XXX: not really */
132 }
133 hdrlen = BPF_WORDALIGN(hdr->length);
134
135 if (caplen < hdrlen) {
136 printf("[|pflog]");
137 return (hdrlen); /* XXX: true? */
138 }
139
140 /* print what we know */
141 hdr = (struct pfloghdr *)p;
142 TCHECK(*hdr);
143 if (eflag)
144 pflog_print(hdr);
145
146 /* skip to the real packet */
147 af = hdr->af;
148 length -= hdrlen;
149 caplen -= hdrlen;
150 p += hdrlen;
151 switch (af) {
152
153 case AF_INET:
154 #if OPENBSD_AF_INET != AF_INET
155 case OPENBSD_AF_INET: /* XXX: read pcap files */
156 #endif
157 ip_print(gndo, p, length);
158 break;
159
160 #ifdef INET6
161 case AF_INET6:
162 #if OPENBSD_AF_INET6 != AF_INET6
163 case OPENBSD_AF_INET6: /* XXX: read pcap files */
164 #endif
165 ip6_print(gndo, p, length);
166 break;
167 #endif
168
169 default:
170 /* address family not handled, print raw packet */
171 if (!eflag)
172 pflog_print(hdr);
173 if (!suppress_default_print)
174 default_print(p, caplen);
175 }
176
177 return (hdrlen);
178 trunc:
179 printf("[|pflog]");
180 return (hdrlen);
181 }
182
183 /*
184 * Local Variables:
185 * c-style: whitesmith
186 * c-basic-offset: 8
187 * End:
188 */
189