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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #ifndef HAVE_NET_PFVAR_H
  27 #error "No pf headers available"
  28 #endif
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <net/if.h>
  32 #include <net/pfvar.h>
  33 #include <net/if_pflog.h>
  34
  35 #include <netdissect-stdinc.h>
  36
  37 #include "netdissect.h"
  38 #include "extract.h"
  39
  40 static const char tstr[] = "[|pflog]";
  41
  42 static const struct tok pf_reasons[] = {
  43         { 0,    "0(match)" },
  44         { 1,    "1(bad-offset)" },
  45         { 2,    "2(fragment)" },
  46         { 3,    "3(short)" },
  47         { 4,    "4(normalize)" },
  48         { 5,    "5(memory)" },
  49         { 6,    "6(bad-timestamp)" },
  50         { 7,    "7(congestion)" },
  51         { 8,    "8(ip-option)" },
  52         { 9,    "9(proto-cksum)" },
  53         { 10,   "10(state-mismatch)" },
  54         { 11,   "11(state-insert)" },
  55         { 12,   "12(state-limit)" },
  56         { 13,   "13(src-limit)" },
  57         { 14,   "14(synproxy)" },
  58         { 0,    NULL }
  59 };
  60
  61 static const struct tok pf_actions[] = {
  62         { PF_PASS,              "pass" },
  63         { PF_DROP,              "block" },
  64         { PF_SCRUB,             "scrub" },
  65         { PF_NAT,               "nat" },
  66         { PF_NONAT,             "nat" },
  67         { PF_BINAT,             "binat" },
  68         { PF_NOBINAT,           "binat" },
  69         { PF_RDR,               "rdr" },
  70         { PF_NORDR,             "rdr" },
  71         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  72         { 0,                    NULL }
  73 };
  74
  75 static const struct tok pf_directions[] = {
  76         { PF_INOUT,     "in/out" },
  77         { PF_IN,        "in" },
  78         { PF_OUT,       "out" },
  79         { 0,            NULL }
  80 };
  81
  82 /* For reading capture files on other systems */
  83 #define OPENBSD_AF_INET         2
  84 #define OPENBSD_AF_INET6        24
  85
  86 static void
  87 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
  88 {
  89         uint32_t rulenr, subrulenr;
  90
  91         rulenr = EXTRACT_32BITS(&hdr->rulenr);
  92         subrulenr = EXTRACT_32BITS(&hdr->subrulenr);
  93         if (subrulenr == (uint32_t)-1)
  94                 ND_PRINT((ndo, "rule %u/", rulenr));
  95         else
  96                 ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
  97
  98         ND_PRINT((ndo, "%s: %s %s on %s: ",
  99             tok2str(pf_reasons, "unkn(%u)", hdr->reason),
 100             tok2str(pf_actions, "unkn(%u)", hdr->action),
 101             tok2str(pf_directions, "unkn(%u)", hdr->dir),
 102             hdr->ifname));
 103 }
 104
 105 u_int
 106 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 107                register const u_char *p)
 108 {
 109         u_int length = h->len;
 110         u_int hdrlen;
 111         u_int caplen = h->caplen;
 112         const struct pfloghdr *hdr;
 113         uint8_t af;
 114
 115         /* check length */
 116         if (caplen < sizeof(uint8_t)) {
 117                 ND_PRINT((ndo, "%s", tstr));
 118                 return (caplen);
 119         }
 120
 121 #define MIN_PFLOG_HDRLEN        45
 122         hdr = (struct pfloghdr *)p;
 123         if (hdr->length < MIN_PFLOG_HDRLEN) {
 124                 ND_PRINT((ndo, "[pflog: invalid header length!]"));
 125                 return (hdr->length);   /* XXX: not really */
 126         }
 127         hdrlen = BPF_WORDALIGN(hdr->length);
 128
 129         if (caplen < hdrlen) {
 130                 ND_PRINT((ndo, "%s", tstr));
 131                 return (hdrlen);        /* XXX: true? */
 132         }
 133
 134         /* print what we know */
 135         hdr = (struct pfloghdr *)p;
 136         ND_TCHECK(*hdr);
 137         if (ndo->ndo_eflag)
 138                 pflog_print(ndo, hdr);
 139
 140         /* skip to the real packet */
 141         af = hdr->af;
 142         length -= hdrlen;
 143         caplen -= hdrlen;
 144         p += hdrlen;
 145         switch (af) {
 146
 147                 case AF_INET:
 148 #if OPENBSD_AF_INET != AF_INET
 149                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 150 #endif
 151                         ip_print(ndo, p, length);
 152                         break;
 153
 154 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
 155 #ifdef AF_INET6
 156                 case AF_INET6:
 157 #endif /* AF_INET6 */
 158 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
 159                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 160 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
 161                         ip6_print(ndo, p, length);
 162                         break;
 163 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
 164
 165         default:
 166                 /* address family not handled, print raw packet */
 167                 if (!ndo->ndo_eflag)
 168                         pflog_print(ndo, hdr);
 169                 if (!ndo->ndo_suppress_default_print)
 170                         ND_DEFAULTPRINT(p, caplen);
 171         }
 172
 173         return (hdrlen);
 174 trunc:
 175         ND_PRINT((ndo, "%s", tstr));
 176         return (hdrlen);
 177 }
 178
 179 /*
 180  * Local Variables:
 181  * c-style: whitesmith
 182  * c-basic-offset: 8
 183  * End:
 184  */