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