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 1.15 2006-10-25 22:13:10 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         { 6,    "6(bad-timestamp)" },
  48         { 7,    "7(congestion)" },
  49         { 8,    "8(ip-option)" },
  50         { 9,    "9(proto-cksum)" },
  51         { 10,   "10(state-mismatch)" },
  52         { 11,   "11(state-insert)" },
  53         { 12,   "12(state-limit)" },
  54         { 13,   "13(src-limit)" },
  55         { 14,   "14(synproxy)" },
  56         { 0,    NULL }
  57 };
  58
  59 static struct tok pf_actions[] = {
  60         { PF_PASS,              "pass" },
  61         { PF_DROP,              "block" },
  62         { PF_SCRUB,             "scrub" },
  63         { PF_NAT,               "nat" },
  64         { PF_NONAT,             "nat" },
  65         { PF_BINAT,             "binat" },
  66         { PF_NOBINAT,           "binat" },
  67         { PF_RDR,               "rdr" },
  68         { PF_NORDR,             "rdr" },
  69         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  70         { 0,                    NULL }
  71 };
  72
  73 static struct tok pf_directions[] = {
  74         { PF_INOUT,     "in/out" },
  75         { PF_IN,        "in" },
  76         { PF_OUT,       "out" },
  77         { 0,            NULL }
  78 };
  79
  80 /* For reading capture files on other systems */
  81 #define OPENBSD_AF_INET         2
  82 #define OPENBSD_AF_INET6        24
  83
  84 static void
  85 pflog_print(const struct pfloghdr *hdr)
  86 {
  87         u_int32_t rulenr, subrulenr;
  88
  89         rulenr = ntohl(hdr->rulenr);
  90         subrulenr = ntohl(hdr->subrulenr);
  91         if (subrulenr == (u_int32_t)-1)
  92                 printf("rule %u/", rulenr);
  93         else
  94                 printf("rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr);
  95
  96         printf("%s: %s %s on %s: ",
  97             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
  98             tok2str(pf_actions, "unkn(%u)", hdr->action),
  99             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 100             hdr->ifname);
 101 }
 102
 103 u_int
 104 pflog_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 105 {
 106         u_int length = h->len;
 107         u_int hdrlen;
 108         u_int caplen = h->caplen;
 109         const struct pfloghdr *hdr;
 110         u_int8_t af;
 111
 112         /* check length */
 113         if (caplen < sizeof(u_int8_t)) {
 114                 printf("[|pflog]");
 115                 return (caplen);
 116         }
 117
 118 #define MIN_PFLOG_HDRLEN        45
 119         hdr = (struct pfloghdr *)p;
 120         if (hdr->length < MIN_PFLOG_HDRLEN) {
 121                 printf("[pflog: invalid header length!]");
 122                 return (hdr->length);   /* XXX: not really */
 123         }
 124         hdrlen = BPF_WORDALIGN(hdr->length);
 125
 126         if (caplen < hdrlen) {
 127                 printf("[|pflog]");
 128                 return (hdrlen);        /* XXX: true? */
 129         }
 130
 131         /* print what we know */
 132         hdr = (struct pfloghdr *)p;
 133         TCHECK(*hdr);
 134         if (eflag)
 135                 pflog_print(hdr);
 136
 137         /* skip to the real packet */
 138         af = hdr->af;
 139         length -= hdrlen;
 140         caplen -= hdrlen;
 141         p += hdrlen;
 142         switch (af) {
 143
 144                 case AF_INET:
 145 #if OPENBSD_AF_INET != AF_INET
 146                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 147 #endif
 148                         ip_print(gndo, p, length);
 149                         break;
 150
 151 #ifdef INET6
 152                 case AF_INET6:
 153 #if OPENBSD_AF_INET6 != AF_INET6
 154                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 155 #endif
 156                         ip6_print(p, length);
 157                         break;
 158 #endif
 159
 160         default:
 161                 /* address family not handled, print raw packet */
 162                 if (!eflag)
 163                         pflog_print(hdr);
 164                 if (!suppress_default_print)
 165                         default_print(p, caplen);
 166         }
 167
 168         return (hdrlen);
 169 trunc:
 170         printf("[|pflog]");
 171         return (hdrlen);
 172 }
 173
 174 /*
 175  * Local Variables:
 176  * c-style: whitesmith
 177  * c-basic-offset: 8
 178  * End:
 179  */