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 1.7.2.5 2004-04-02 06:49:25 guy 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         u_int32_t rulenr, subrulenr;
  79
  80         rulenr = ntohl(hdr->rulenr);
  81         subrulenr = ntohl(hdr->subrulenr);
  82         if (subrulenr == (u_int32_t)-1)
  83                 printf("rule %u/", rulenr);
  84         else
  85                 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
  86
  87         printf("%s: %s %s on %s: ",
  88             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
  89             tok2str(pf_actions, "unkn(%u)", hdr->action),
  90             tok2str(pf_directions, "unkn(%u)", hdr->dir),
  91             hdr->ifname);
  92 }
  93
  94 u_int
  95 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
  96 {
  97         u_int length = h->len;
  98         u_int hdrlen;
  99         u_int caplen = h->caplen;
 100         const struct pfloghdr *hdr;
 101         u_int8_t af;
 102
 103         /* check length */
 104         if (caplen < sizeof(u_int8_t)) {
 105                 printf("[|pflog]");
 106                 return (caplen);
 107         }
 108
 109 #define MIN_PFLOG_HDRLEN        45
 110         hdr = (struct pfloghdr *)p;
 111         if (hdr->length < MIN_PFLOG_HDRLEN) {
 112                 printf("[pflog: invalid header length!]");
 113                 return (hdr->length);   /* XXX: not really */
 114         }
 115         hdrlen = BPF_WORDALIGN(hdr->length);
 116
 117         if (caplen < hdrlen) {
 118                 printf("[|pflog]");
 119                 return (hdrlen);        /* XXX: true? */
 120         }
 121
 122         /* print what we know */
 123         hdr = (struct pfloghdr *)p;
 124         TCHECK(*hdr);
 125         if (eflag)
 126                 pflog_print(hdr);
 127
 128         /* skip to the real packet */
 129         af = hdr->af;
 130         length -= hdrlen;
 131         caplen -= hdrlen;
 132         p += hdrlen;
 133         switch (af) {
 134
 135                 case AF_INET:
 136 #if OPENBSD_AF_INET != AF_INET
 137                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 138 #endif
 139                         ip_print(p, length);
 140                         break;
 141
 142 #ifdef INET6
 143                 case AF_INET6:
 144 #if OPENBSD_AF_INET6 != AF_INET6
 145                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 146 #endif
 147                         ip6_print(p, length);
 148                         break;
 149 #endif
 150
 151         default:
 152                 /* address family not handled, print raw packet */
 153                 if (!eflag)
 154                         pflog_print(hdr);
 155                 if (!xflag && !qflag)
 156                         default_print(p, caplen);
 157         }
 158
 159         return (hdrlen);
 160 trunc:
 161         printf("[|pflog]");
 162         return (hdrlen);
 163 }