contrib/tcpdump-3.9/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 1.13.2.4 2007/09/13 17:18:10 gianluca 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
  35 #include <sys/types.h>
  36 #ifndef WIN32
  37 #include <sys/socket.h>
  38 #endif
  39 #include <net/if.h>
  40 #include <net/pfvar.h>
  41 #include <net/if_pflog.h>
  42
  43
  44
  45 #include <tcpdump-stdinc.h>
  46
  47 #include <stdio.h>
  48 #include <pcap.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52
  53 static struct tok pf_reasons[] = {
  54         { 0,    "0(match)" },
  55         { 1,    "1(bad-offset)" },
  56         { 2,    "2(fragment)" },
  57         { 3,    "3(short)" },
  58         { 4,    "4(normalize)" },
  59         { 5,    "5(memory)" },
  60         { 6,    "6(bad-timestamp)" },
  61         { 7,    "7(congestion)" },
  62         { 8,    "8(ip-option)" },
  63         { 9,    "9(proto-cksum)" },
  64         { 10,   "10(state-mismatch)" },
  65         { 11,   "11(state-insert)" },
  66         { 12,   "12(state-limit)" },
  67         { 13,   "13(src-limit)" },
  68         { 14,   "14(synproxy)" },
  69         { 0,    NULL }
  70 };
  71
  72 static struct tok pf_actions[] = {
  73         { PF_PASS,              "pass" },
  74         { PF_DROP,              "block" },
  75         { PF_SCRUB,             "scrub" },
  76         { PF_NAT,               "nat" },
  77         { PF_NONAT,             "nat" },
  78         { PF_BINAT,             "binat" },
  79         { PF_NOBINAT,           "binat" },
  80         { PF_RDR,               "rdr" },
  81         { PF_NORDR,             "rdr" },
  82         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  83         { 0,                    NULL }
  84 };
  85
  86 static struct tok pf_directions[] = {
  87         { PF_INOUT,     "in/out" },
  88         { PF_IN,        "in" },
  89         { PF_OUT,       "out" },
  90         { 0,            NULL }
  91 };
  92
  93 /* For reading capture files on other systems */
  94 #define OPENBSD_AF_INET         2
  95 #define OPENBSD_AF_INET6        24
  96
  97 static void
  98 pflog_print(const struct pfloghdr *hdr)
  99 {
 100         u_int32_t rulenr, subrulenr;
 101
 102         rulenr = ntohl(hdr->rulenr);
 103         subrulenr = ntohl(hdr->subrulenr);
 104         if (subrulenr == (u_int32_t)-1)
 105                 printf("rule %u/", rulenr);
 106         else
 107                 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
 108
 109         printf("%s: %s %s on %s: ",
 110             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
 111             tok2str(pf_actions, "unkn(%u)", hdr->action),
 112             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 113             hdr->ifname);
 114 }
 115
 116 u_int
 117 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 118 {
 119         u_int length = h->len;
 120         u_int hdrlen;
 121         u_int caplen = h->caplen;
 122         const struct pfloghdr *hdr;
 123         u_int8_t af;
 124
 125         /* check length */
 126         if (caplen < sizeof(u_int8_t)) {
 127                 printf("[|pflog]");
 128                 return (caplen);
 129         }
 130
 131 #define MIN_PFLOG_HDRLEN        45
 132         hdr = (struct pfloghdr *)p;
 133         if (hdr->length < MIN_PFLOG_HDRLEN) {
 134                 printf("[pflog: invalid header length!]");
 135                 return (hdr->length);   /* XXX: not really */
 136         }
 137         hdrlen = BPF_WORDALIGN(hdr->length);
 138
 139         if (caplen < hdrlen) {
 140                 printf("[|pflog]");
 141                 return (hdrlen);        /* XXX: true? */
 142         }
 143
 144         /* print what we know */
 145         hdr = (struct pfloghdr *)p;
 146         TCHECK(*hdr);
 147         if (eflag)
 148                 pflog_print(hdr);
 149
 150         /* skip to the real packet */
 151         af = hdr->af;
 152         length -= hdrlen;
 153         caplen -= hdrlen;
 154         p += hdrlen;
 155         switch (af) {
 156
 157                 case AF_INET:
 158 #if OPENBSD_AF_INET != AF_INET
 159                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 160 #endif
 161                         ip_print(gndo, p, length);
 162                         break;
 163
 164 #ifdef INET6
 165                 case AF_INET6:
 166 #if OPENBSD_AF_INET6 != AF_INET6
 167                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 168 #endif
 169                         ip6_print(p, length);
 170                         break;
 171 #endif
 172
 173         default:
 174                 /* address family not handled, print raw packet */
 175                 if (!eflag)
 176                         pflog_print(hdr);
 177                 if (!suppress_default_print)
 178                         default_print(p, caplen);
 179         }
 180
 181         return (hdrlen);
 182 trunc:
 183         printf("[|pflog]");
 184         return (hdrlen);
 185 }
 186
 187 /*
 188  * Local Variables:
 189  * c-style: whitesmith
 190  * c-basic-offset: 8
 191  * End:
 192  */