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 1.7.2.3 2004-03-28 21:25:03 fenner Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <pcap.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "pf.h"
  39
  40 static struct tok pf_reasons[] = {
  41         { 0,    "0(match)" },
  42         { 1,    "1(bad-offset)" },
  43         { 2,    "2(fragment)" },
  44         { 3,    "3(short)" },
  45         { 4,    "4(normalize)" },
  46         { 5,    "5(memory)" },
  47         { 0,    NULL }
  48 };
  49
  50 static struct tok pf_actions[] = {
  51         { PF_PASS,              "pass" },
  52         { PF_DROP,              "block" },
  53         { PF_SCRUB,             "scrub" },
  54         { PF_NAT,               "nat" },
  55         { PF_NONAT,             "nat" },
  56         { PF_BINAT,             "binat" },
  57         { PF_NOBINAT,           "binat" },
  58         { PF_RDR,               "rdr" },
  59         { PF_NORDR,             "rdr" },
  60         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  61         { 0,                    NULL }
  62 };
  63
  64 static struct tok pf_directions[] = {
  65         { PF_INOUT,     "in/out" },
  66         { PF_IN,        "in" },
  67         { PF_OUT,       "out" },
  68         { 0,            NULL }
  69 };
  70
  71 /* For reading capture files on other systems */
  72 #define OPENBSD_AF_INET         2
  73 #define OPENBSD_AF_INET6        24
  74
  75 static void
  76 pflog_print(const struct pfloghdr *hdr)
  77 {
  78         if (ntohl(hdr->subrulenr) == (u_int32_t)-1)
  79                 printf("rule %u/", ntohl(hdr->rulenr));
  80         else
  81                 printf("rule %u.%s.%u/", ntohl(hdr->rulenr), hdr->ruleset,
  82                     ntohl(hdr->subrulenr));
  83
  84         printf("%s: %s %s on %s: ",
  85             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
  86             tok2str(pf_actions, "unkn(%u)", hdr->action),
  87             tok2str(pf_directions, "unkn(%u)", hdr->dir),
  88             hdr->ifname);
  89 }
  90
  91 u_int
  92 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
  93 {
  94         u_int length = h->len;
  95         u_int hdrlen;
  96         u_int caplen = h->caplen;
  97         const struct ip *ip;
  98 #ifdef INET6
  99         const struct ip6_hdr *ip6;
 100 #endif
 101         const struct pfloghdr *hdr;
 102         u_int8_t af;
 103
 104         /* check length */
 105         if (caplen < sizeof(u_int8_t)) {
 106                 printf("[|pflog]");
 107                 return (caplen);
 108         }
 109
 110 #define MIN_PFLOG_HDRLEN        45
 111         hdr = (struct pfloghdr *)p;
 112         if (hdr->length < MIN_PFLOG_HDRLEN) {
 113                 printf("[pflog: invalid header length!]");
 114                 return (hdr->length);   /* XXX: not really */
 115         }
 116         hdrlen = BPF_WORDALIGN(hdr->length);
 117
 118         if (caplen < hdrlen) {
 119                 printf("[|pflog]");
 120                 return (hdrlen);        /* XXX: true? */
 121         }
 122
 123         /* print what we know */
 124         hdr = (struct pfloghdr *)p;
 125         TCHECK(*hdr);
 126         if (eflag)
 127                 pflog_print(hdr);
 128
 129         /* skip to the real packet */
 130         af = hdr->af;
 131         length -= hdrlen;
 132         caplen -= hdrlen;
 133         p += hdrlen;
 134         switch (af) {
 135
 136                 case AF_INET:
 137 #if OPENBSD_AF_INET != AF_INET
 138                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 139 #endif
 140                         ip_print(p, length);
 141                         break;
 142
 143 #ifdef INET6
 144                 case AF_INET6:
 145 #if OPENBSD_AF_INET6 != AF_INET6
 146                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 147 #endif
 148                         ip6_print(p, length);
 149                         break;
 150 #endif
 151
 152         default:
 153                 /* address family not handled, print raw packet */
 154                 if (!eflag)
 155                         pflog_print(hdr);
 156                 if (!xflag && !qflag)
 157                         default_print(p, caplen);
 158         }
 159
 160         return (hdrlen);
 161 trunc:
 162         printf("[|pflog]");
 163         return (hdrlen);
 164 }