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: *BSD/Darwin packet filter log file printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32 #include "af.h"
  33
  34 #include "pflog.h"
  35
  36 static const struct tok pf_reasons[] = {
  37         { PFRES_MATCH,          "0(match)" },
  38         { PFRES_BADOFF,         "1(bad-offset)" },
  39         { PFRES_FRAG,           "2(fragment)" },
  40         { PFRES_SHORT,          "3(short)" },
  41         { PFRES_NORM,           "4(normalize)" },
  42         { PFRES_MEMORY,         "5(memory)" },
  43         { PFRES_TS,             "6(bad-timestamp)" },
  44         { PFRES_CONGEST,        "7(congestion)" },
  45         { PFRES_IPOPTIONS,      "8(ip-option)" },
  46         { PFRES_PROTCKSUM,      "9(proto-cksum)" },
  47         { PFRES_BADSTATE,       "10(state-mismatch)" },
  48         { PFRES_STATEINS,       "11(state-insert)" },
  49         { PFRES_MAXSTATES,      "12(state-limit)" },
  50         { PFRES_SRCLIMIT,       "13(src-limit)" },
  51         { PFRES_SYNPROXY,       "14(synproxy)" },
  52 #if defined(__FreeBSD__)
  53         { PFRES_MAPFAILED,      "15(map-failed)" },
  54 #elif defined(__NetBSD__)
  55         { PFRES_STATELOCKED,    "15(state-locked)" },
  56 #elif defined(__OpenBSD__)
  57         { PFRES_TRANSLATE,      "15(translate)" },
  58         { PFRES_NOROUTE,        "16(no-route)" },
  59 #elif defined(__APPLE__)
  60         { PFRES_DUMMYNET,       "15(dummynet)" },
  61 #endif
  62         { 0,    NULL }
  63 };
  64
  65 static const struct tok pf_actions[] = {
  66         { PF_PASS,              "pass" },
  67         { PF_DROP,              "block" },
  68         { PF_SCRUB,             "scrub" },
  69         { PF_NAT,               "nat" },
  70         { PF_NONAT,             "nonat" },
  71         { PF_BINAT,             "binat" },
  72         { PF_NOBINAT,           "nobinat" },
  73         { PF_RDR,               "rdr" },
  74         { PF_NORDR,             "nordr" },
  75         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  76 #if defined(__FreeBSD__)
  77         { PF_DEFER,             "defer" },
  78 #elif defined(__OpenBSD__)
  79         { PF_DEFER,             "defer" },
  80         { PF_MATCH,             "match" },
  81         { PF_DIVERT,            "divert" },
  82         { PF_RT,                "rt" },
  83         { PF_AFRT,              "afrt" },
  84 #elif defined(__APPLE__)
  85         { PF_DUMMYNET,          "dummynet" },
  86         { PF_NODUMMYNET,        "nodummynet" },
  87         { PF_NAT64,             "nat64" },
  88         { PF_NONAT64,           "nonat64" },
  89 #endif
  90         { 0,                    NULL }
  91 };
  92
  93 static const struct tok pf_directions[] = {
  94         { PF_INOUT,     "in/out" },
  95         { PF_IN,        "in" },
  96         { PF_OUT,       "out" },
  97 #if defined(__OpenBSD__)
  98         { PF_FWD,       "fwd" },
  99 #endif
 100         { 0,            NULL }
 101 };
 102
 103 static void
 104 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
 105 {
 106         uint32_t rulenr, subrulenr;
 107
 108         ndo->ndo_protocol = "pflog";
 109         rulenr = GET_BE_U_4(hdr->rulenr);
 110         subrulenr = GET_BE_U_4(hdr->subrulenr);
 111         if (subrulenr == (uint32_t)-1)
 112                 ND_PRINT("rule %u/", rulenr);
 113         else {
 114                 ND_PRINT("rule %u.", rulenr);
 115                 nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE);
 116                 ND_PRINT(".%u/", subrulenr);
 117         }
 118
 119         ND_PRINT("%s: %s %s on ",
 120             tok2str(pf_reasons, "unkn(%u)", GET_U_1(hdr->reason)),
 121             tok2str(pf_actions, "unkn(%u)", GET_U_1(hdr->action)),
 122             tok2str(pf_directions, "unkn(%u)", GET_U_1(hdr->dir)));
 123         nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ);
 124         ND_PRINT(": ");
 125 }
 126
 127 void
 128 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 129                const u_char *p)
 130 {
 131         u_int length = h->len;
 132         u_int hdrlen;
 133         u_int caplen = h->caplen;
 134         const struct pfloghdr *hdr;
 135         uint8_t af;
 136
 137         ndo->ndo_protocol = "pflog";
 138         /* check length */
 139         if (caplen < sizeof(uint8_t)) {
 140                 nd_print_trunc(ndo);
 141                 ndo->ndo_ll_hdr_len += h->caplen;
 142                 return;
 143         }
 144
 145         hdr = (const struct pfloghdr *)p;
 146         hdrlen = GET_U_1(hdr->length);
 147         if (hdrlen < MIN_PFLOG_HDRLEN) {
 148                 ND_PRINT("[pflog: invalid header length!]");
 149                 ndo->ndo_ll_hdr_len += hdrlen;  /* XXX: not really */
 150                 return;
 151         }
 152         hdrlen = roundup2(hdrlen, 4);
 153
 154         if (caplen < hdrlen) {
 155                 nd_print_trunc(ndo);
 156                 ndo->ndo_ll_hdr_len += hdrlen;  /* XXX: true? */
 157                 return;
 158         }
 159
 160         /* print what we know */
 161         ND_TCHECK_SIZE(hdr);
 162         if (ndo->ndo_eflag)
 163                 pflog_print(ndo, hdr);
 164
 165         /* skip to the real packet */
 166         af = GET_U_1(hdr->af);
 167         length -= hdrlen;
 168         caplen -= hdrlen;
 169         p += hdrlen;
 170         switch (af) {
 171
 172                 /*
 173                  * If there's a system that doesn't use the AF_INET
 174                  * from 4.2BSD, feel free to add its value to af.h
 175                  * and use it here.
 176                  *
 177                  * Hopefully, there isn't.
 178                  */
 179                 case BSD_AF_INET:
 180                         ip_print(ndo, p, length);
 181                         break;
 182
 183                 /*
 184                  * Try all AF_INET6 values for all systems with pflog,
 185                  * including Darwin.
 186                  */
 187                 case BSD_AF_INET6_BSD:
 188                 case BSD_AF_INET6_FREEBSD:
 189                 case BSD_AF_INET6_DARWIN:
 190                         ip6_print(ndo, p, length);
 191                         break;
 192
 193         default:
 194                 /* address family not handled, print raw packet */
 195                 if (!ndo->ndo_eflag)
 196                         pflog_print(ndo, hdr);
 197                 if (!ndo->ndo_suppress_default_print)
 198                         ND_DEFAULTPRINT(p, caplen);
 199         }
 200
 201         ndo->ndo_ll_hdr_len += hdrlen;
 202         return;
 203 trunc:
 204         nd_print_trunc(ndo);
 205         ndo->ndo_ll_hdr_len += hdrlen;
 206 }