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 /* \summary: OpenBSD packet filter log file printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #ifndef HAVE_NET_PFVAR_H
  29 #error "No pf headers available"
  30 #endif
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <net/if.h>
  34 #include <net/pfvar.h>
  35 #include <net/if_pflog.h>
  36
  37 #include <netdissect-stdinc.h>
  38
  39 #include "netdissect.h"
  40 #include "extract.h"
  41
  42 static const char tstr[] = "[|pflog]";
  43
  44 static const struct tok pf_reasons[] = {
  45         { 0,    "0(match)" },
  46         { 1,    "1(bad-offset)" },
  47         { 2,    "2(fragment)" },
  48         { 3,    "3(short)" },
  49         { 4,    "4(normalize)" },
  50         { 5,    "5(memory)" },
  51         { 6,    "6(bad-timestamp)" },
  52         { 7,    "7(congestion)" },
  53         { 8,    "8(ip-option)" },
  54         { 9,    "9(proto-cksum)" },
  55         { 10,   "10(state-mismatch)" },
  56         { 11,   "11(state-insert)" },
  57         { 12,   "12(state-limit)" },
  58         { 13,   "13(src-limit)" },
  59         { 14,   "14(synproxy)" },
  60         { 0,    NULL }
  61 };
  62
  63 static const struct tok pf_actions[] = {
  64         { PF_PASS,              "pass" },
  65         { PF_DROP,              "block" },
  66         { PF_SCRUB,             "scrub" },
  67         { PF_NAT,               "nat" },
  68         { PF_NONAT,             "nat" },
  69         { PF_BINAT,             "binat" },
  70         { PF_NOBINAT,           "binat" },
  71         { PF_RDR,               "rdr" },
  72         { PF_NORDR,             "rdr" },
  73         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  74         { 0,                    NULL }
  75 };
  76
  77 static const struct tok pf_directions[] = {
  78         { PF_INOUT,     "in/out" },
  79         { PF_IN,        "in" },
  80         { PF_OUT,       "out" },
  81         { 0,            NULL }
  82 };
  83
  84 /* For reading capture files on other systems */
  85 #define OPENBSD_AF_INET         2
  86 #define OPENBSD_AF_INET6        24
  87
  88 static void
  89 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
  90 {
  91         uint32_t rulenr, subrulenr;
  92
  93         rulenr = EXTRACT_BE_U_4(&hdr->rulenr);
  94         subrulenr = EXTRACT_BE_U_4(&hdr->subrulenr);
  95         if (subrulenr == (uint32_t)-1)
  96                 ND_PRINT((ndo, "rule %u/", rulenr));
  97         else
  98                 ND_PRINT((ndo, "rule %u.%s.%u/", rulenr, hdr->ruleset, subrulenr));
  99
 100         ND_PRINT((ndo, "%s: %s %s on %s: ",
 101             tok2str(pf_reasons, "unkn(%u)", EXTRACT_U_1(&hdr->reason)),
 102             tok2str(pf_actions, "unkn(%u)", EXTRACT_U_1(&hdr->action)),
 103             tok2str(pf_directions, "unkn(%u)", EXTRACT_U_1(&hdr->dir)),
 104             hdr->ifname));
 105 }
 106
 107 u_int
 108 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 109                const u_char *p)
 110 {
 111         u_int length = h->len;
 112         u_int hdrlen;
 113         u_int caplen = h->caplen;
 114         const struct pfloghdr *hdr;
 115         uint8_t af;
 116
 117         /* check length */
 118         if (caplen < sizeof(uint8_t)) {
 119                 ND_PRINT((ndo, "%s", tstr));
 120                 return (caplen);
 121         }
 122
 123 #define MIN_PFLOG_HDRLEN        45
 124         hdr = (const struct pfloghdr *)p;
 125         if (hdr->length < MIN_PFLOG_HDRLEN) {
 126                 ND_PRINT((ndo, "[pflog: invalid header length!]"));
 127                 return (hdr->length);   /* XXX: not really */
 128         }
 129         hdrlen = BPF_WORDALIGN(hdr->length);
 130
 131         if (caplen < hdrlen) {
 132                 ND_PRINT((ndo, "%s", tstr));
 133                 return (hdrlen);        /* XXX: true? */
 134         }
 135
 136         /* print what we know */
 137         ND_TCHECK(*hdr);
 138         if (ndo->ndo_eflag)
 139                 pflog_print(ndo, hdr);
 140
 141         /* skip to the real packet */
 142         af = EXTRACT_U_1(&hdr->af);
 143         length -= hdrlen;
 144         caplen -= hdrlen;
 145         p += hdrlen;
 146         switch (af) {
 147
 148                 case AF_INET:
 149 #if OPENBSD_AF_INET != AF_INET
 150                 case OPENBSD_AF_INET:           /* XXX: read pcap files */
 151 #endif
 152                         ip_print(ndo, p, length);
 153                         break;
 154
 155 #if defined(AF_INET6) || defined(OPENBSD_AF_INET6)
 156 #ifdef AF_INET6
 157                 case AF_INET6:
 158 #endif /* AF_INET6 */
 159 #if !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6
 160                 case OPENBSD_AF_INET6:          /* XXX: read pcap files */
 161 #endif /* !defined(AF_INET6) || OPENBSD_AF_INET6 != AF_INET6 */
 162                         ip6_print(ndo, p, length);
 163                         break;
 164 #endif /* defined(AF_INET6) || defined(OPENBSD_AF_INET6) */
 165
 166         default:
 167                 /* address family not handled, print raw packet */
 168                 if (!ndo->ndo_eflag)
 169                         pflog_print(ndo, hdr);
 170                 if (!ndo->ndo_suppress_default_print)
 171                         ND_DEFAULTPRINT(p, caplen);
 172         }
 173
 174         return (hdrlen);
 175 trunc:
 176         ND_PRINT((ndo, "%s", tstr));
 177         return (hdrlen);
 178 }
 179
 180 /*
 181  * Local Variables:
 182  * c-style: whitesmith
 183  * c-basic-offset: 8
 184  * End:
 185  */