contrib/tcpdump/print-pflog.c

   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/if_var.h>
  38 #include <net/pf/pfvar.h>
  39 #include <net/pf/if_pflog.h>
  40
  41 #include <tcpdump-stdinc.h>
  42
  43 #include <stdio.h>
  44 #include <pcap.h>
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48
  49 static 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 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 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
  94 pflog_print(const struct pfloghdr *hdr)
  95 {
  96         u_int32_t rulenr, subrulenr;
  97
  98         rulenr = ntohl(hdr->rulenr);
  99         subrulenr = ntohl(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
 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(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  */