The Tcpdump Group git mirrors - tcpdump/blob - 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/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 "interface.h"
  46 #include "addrtoname.h"
  47
  48 static struct tok pf_reasons[] = {
  49         { 0,    "0(match)" },
  50         { 1,    "1(bad-offset)" },
  51         { 2,    "2(fragment)" },
  52         { 3,    "3(short)" },
  53         { 4,    "4(normalize)" },
  54         { 5,    "5(memory)" },
  55         { 6,    "6(bad-timestamp)" },
  56         { 7,    "7(congestion)" },
  57         { 8,    "8(ip-option)" },
  58         { 9,    "9(proto-cksum)" },
  59         { 10,   "10(state-mismatch)" },
  60         { 11,   "11(state-insert)" },
  61         { 12,   "12(state-limit)" },
  62         { 13,   "13(src-limit)" },
  63         { 14,   "14(synproxy)" },
  64         { 0,    NULL }
  65 };
  66
  67 static struct tok pf_actions[] = {
  68         { PF_PASS,              "pass" },
  69         { PF_DROP,              "block" },
  70         { PF_SCRUB,             "scrub" },
  71         { PF_NAT,               "nat" },
  72         { PF_NONAT,             "nat" },
  73         { PF_BINAT,             "binat" },
  74         { PF_NOBINAT,           "binat" },
  75         { PF_RDR,               "rdr" },
  76         { PF_NORDR,             "rdr" },
  77         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  78         { 0,                    NULL }
  79 };
  80
  81 static struct tok pf_directions[] = {
  82         { PF_INOUT,     "in/out" },
  83         { PF_IN,        "in" },
  84         { PF_OUT,       "out" },
  85         { 0,            NULL }
  86 };
  87
  88 /* For reading capture files on other systems */
  89 #define OPENBSD_AF_INET         2
  90 #define OPENBSD_AF_INET6        24
  91
  92 static void
  93 pflog_print(const struct pfloghdr *hdr)
  94 {
  95         u_int32_t rulenr, subrulenr;
  96
  97         rulenr = EXTRACT_32BITS(&hdr->rulenr);
  98         subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
  99         if (subrulenr == (u_int32_t)-1)
 100                 printf("rule %u/", rulenr);
 101         else
 102                 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
 103
 104         printf("%s: %s %s on %s: ",
 105             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
 106             tok2str(pf_actions, "unkn(%u)", hdr->action),
 107             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 108             hdr->ifname);
 109 }
 110
 111 u_int
 112 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 113 {
 114         u_int length = h->len;
 115         u_int hdrlen;
 116         u_int caplen = h->caplen;
 117         const struct pfloghdr *hdr;
 118         u_int8_t af;
 119
 120         /* check length */
 121         if (caplen < sizeof(u_int8_t)) {
 122                 printf("[|pflog]");
 123                 return (caplen);
 124         }
 125
 126 #define MIN_PFLOG_HDRLEN        45
 127         hdr = (struct pfloghdr *)p;
 128         if (hdr->length < MIN_PFLOG_HDRLEN) {
 129                 printf("[pflog: invalid header length!]");
 130                 return (hdr->length);   /* XXX: not really */
 131         }
 132         hdrlen = BPF_WORDALIGN(hdr->length);
 133
 134         if (caplen < hdrlen) {
 135                 printf("[|pflog]");
 136                 return (hdrlen);        /* XXX: true? */
 137         }
 138
 139         /* print what we know */
 140         hdr = (struct pfloghdr *)p;
 141         TCHECK(*hdr);
 142         if (eflag)
 143                 pflog_print(hdr);
 144
 145         /* skip to the real packet */
 146         af = hdr->af;
 147         length -= hdrlen;
 148         caplen -= hdrlen;
 149         p += hdrlen;
 150         switch (af) {
 151
 152                 case AF_INET:
 153 #if OPENBSD_AF_INET != AF_INET
 154                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 155 #endif
 156                         ip_print(gndo, p, length);
 157                         break;
 158
 159 #ifdef INET6
 160                 case AF_INET6:
 161 #if OPENBSD_AF_INET6 != AF_INET6
 162                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 163 #endif
 164                         ip6_print(p, length);
 165                         break;
 166 #endif
 167
 168         default:
 169                 /* address family not handled, print raw packet */
 170                 if (!eflag)
 171                         pflog_print(hdr);
 172                 if (!suppress_default_print)
 173                         default_print(p, caplen);
 174         }
 175
 176         return (hdrlen);
 177 trunc:
 178         printf("[|pflog]");
 179         return (hdrlen);
 180 }
 181
 182 /*
 183  * Local Variables:
 184  * c-style: whitesmith
 185  * c-basic-offset: 8
 186  * End:
 187  */