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 "extract.h"
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48
  49 static const char tstr[] = "[|pflog]";
  50
  51 static const struct tok pf_reasons[] = {
  52         { 0,    "0(match)" },
  53         { 1,    "1(bad-offset)" },
  54         { 2,    "2(fragment)" },
  55         { 3,    "3(short)" },
  56         { 4,    "4(normalize)" },
  57         { 5,    "5(memory)" },
  58         { 6,    "6(bad-timestamp)" },
  59         { 7,    "7(congestion)" },
  60         { 8,    "8(ip-option)" },
  61         { 9,    "9(proto-cksum)" },
  62         { 10,   "10(state-mismatch)" },
  63         { 11,   "11(state-insert)" },
  64         { 12,   "12(state-limit)" },
  65         { 13,   "13(src-limit)" },
  66         { 14,   "14(synproxy)" },
  67         { 0,    NULL }
  68 };
  69
  70 static const struct tok pf_actions[] = {
  71         { PF_PASS,              "pass" },
  72         { PF_DROP,              "block" },
  73         { PF_SCRUB,             "scrub" },
  74         { PF_NAT,               "nat" },
  75         { PF_NONAT,             "nat" },
  76         { PF_BINAT,             "binat" },
  77         { PF_NOBINAT,           "binat" },
  78         { PF_RDR,               "rdr" },
  79         { PF_NORDR,             "rdr" },
  80         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  81         { 0,                    NULL }
  82 };
  83
  84 static const struct tok pf_directions[] = {
  85         { PF_INOUT,     "in/out" },
  86         { PF_IN,        "in" },
  87         { PF_OUT,       "out" },
  88         { 0,            NULL }
  89 };
  90
  91 /* For reading capture files on other systems */
  92 #define OPENBSD_AF_INET         2
  93 #define OPENBSD_AF_INET6        24
  94
  95 static void
  96 pflog_print(const struct pfloghdr *hdr)
  97 {
  98         u_int32_t rulenr, subrulenr;
  99
 100         rulenr = EXTRACT_32BITS(&hdr->rulenr);
 101         subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
 102         if (subrulenr == (u_int32_t)-1)
 103                 printf("rule %u/", rulenr);
 104         else
 105                 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
 106
 107         printf("%s: %s %s on %s: ",
 108             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
 109             tok2str(pf_actions, "unkn(%u)", hdr->action),
 110             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 111             hdr->ifname);
 112 }
 113
 114 u_int
 115 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 116 {
 117         u_int length = h->len;
 118         u_int hdrlen;
 119         u_int caplen = h->caplen;
 120         const struct pfloghdr *hdr;
 121         u_int8_t af;
 122
 123         /* check length */
 124         if (caplen < sizeof(u_int8_t)) {
 125                 printf("%s", pflog);
 126                 return (caplen);
 127         }
 128
 129 #define MIN_PFLOG_HDRLEN        45
 130         hdr = (struct pfloghdr *)p;
 131         if (hdr->length < MIN_PFLOG_HDRLEN) {
 132                 printf("[pflog: invalid header length!]");
 133                 return (hdr->length);   /* XXX: not really */
 134         }
 135         hdrlen = BPF_WORDALIGN(hdr->length);
 136
 137         if (caplen < hdrlen) {
 138                 printf("%s", pflog);
 139                 return (hdrlen);        /* XXX: true? */
 140         }
 141
 142         /* print what we know */
 143         hdr = (struct pfloghdr *)p;
 144         TCHECK(*hdr);
 145         if (eflag)
 146                 pflog_print(hdr);
 147
 148         /* skip to the real packet */
 149         af = hdr->af;
 150         length -= hdrlen;
 151         caplen -= hdrlen;
 152         p += hdrlen;
 153         switch (af) {
 154
 155                 case AF_INET:
 156 #if OPENBSD_AF_INET != AF_INET
 157                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 158 #endif
 159                         ip_print(gndo, p, length);
 160                         break;
 161
 162 #ifdef INET6
 163                 case AF_INET6:
 164 #if OPENBSD_AF_INET6 != AF_INET6
 165                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 166 #endif
 167                         ip6_print(gndo, p, length);
 168                         break;
 169 #endif
 170
 171         default:
 172                 /* address family not handled, print raw packet */
 173                 if (!eflag)
 174                         pflog_print(hdr);
 175                 if (!suppress_default_print)
 176                         default_print(p, caplen);
 177         }
 178
 179         return (hdrlen);
 180 trunc:
 181         printf("%s", pflog);
 182         return (hdrlen);
 183 }
 184
 185 /*
 186  * Local Variables:
 187  * c-style: whitesmith
 188  * c-basic-offset: 8
 189  * End:
 190  */