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 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #include "netdissect.h"
  29 #include "extract.h"
  30 #include "af.h"
  31
  32 #include "pflog.h"
  33
  34 static const struct tok pf_reasons[] = {
  35         { PFRES_MATCH,          "0(match)" },
  36         { PFRES_BADOFF,         "1(bad-offset)" },
  37         { PFRES_FRAG,           "2(fragment)" },
  38         { PFRES_SHORT,          "3(short)" },
  39         { PFRES_NORM,           "4(normalize)" },
  40         { PFRES_MEMORY,         "5(memory)" },
  41         { PFRES_TS,             "6(bad-timestamp)" },
  42         { PFRES_CONGEST,        "7(congestion)" },
  43         { PFRES_IPOPTIONS,      "8(ip-option)" },
  44         { PFRES_PROTCKSUM,      "9(proto-cksum)" },
  45         { PFRES_BADSTATE,       "10(state-mismatch)" },
  46         { PFRES_STATEINS,       "11(state-insert)" },
  47         { PFRES_MAXSTATES,      "12(state-limit)" },
  48         { PFRES_SRCLIMIT,       "13(src-limit)" },
  49         { PFRES_SYNPROXY,       "14(synproxy)" },
  50 #if defined(__FreeBSD__)
  51         { PFRES_MAPFAILED,      "15(map-failed)" },
  52 #elif defined(__NetBSD__)
  53         { PFRES_STATELOCKED,    "15(state-locked)" },
  54 #elif defined(__OpenBSD__)
  55         { PFRES_TRANSLATE,      "15(translate)" },
  56         { PFRES_NOROUTE,        "16(no-route)" },
  57 #elif defined(__APPLE__)
  58         { PFRES_DUMMYNET,       "15(dummynet)" },
  59 #endif
  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,             "nonat" },
  69         { PF_BINAT,             "binat" },
  70         { PF_NOBINAT,           "nobinat" },
  71         { PF_RDR,               "rdr" },
  72         { PF_NORDR,             "nordr" },
  73         { PF_SYNPROXY_DROP,     "synproxy-drop" },
  74 #if defined(__FreeBSD__)
  75         { PF_DEFER,             "defer" },
  76 #elif defined(__OpenBSD__)
  77         { PF_DEFER,             "defer" },
  78         { PF_MATCH,             "match" },
  79         { PF_DIVERT,            "divert" },
  80         { PF_RT,                "rt" },
  81         { PF_AFRT,              "afrt" },
  82 #elif defined(__APPLE__)
  83         { PF_DUMMYNET,          "dummynet" },
  84         { PF_NODUMMYNET,        "nodummynet" },
  85         { PF_NAT64,             "nat64" },
  86         { PF_NONAT64,           "nonat64" },
  87 #endif
  88         { 0,                    NULL }
  89 };
  90
  91 static const struct tok pf_directions[] = {
  92         { PF_INOUT,     "in/out" },
  93         { PF_IN,        "in" },
  94         { PF_OUT,       "out" },
  95 #if defined(__OpenBSD__)
  96         { PF_FWD,       "fwd" },
  97 #endif
  98         { 0,            NULL }
  99 };
 100
 101 static void
 102 pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
 103 {
 104         uint32_t rulenr, subrulenr;
 105
 106         ndo->ndo_protocol = "pflog";
 107         rulenr = GET_BE_U_4(hdr->rulenr);
 108         subrulenr = GET_BE_U_4(hdr->subrulenr);
 109         if (subrulenr == (uint32_t)-1)
 110                 ND_PRINT("rule %u/", rulenr);
 111         else {
 112                 ND_PRINT("rule %u.", rulenr);
 113                 nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE);
 114                 ND_PRINT(".%u/", subrulenr);
 115         }
 116
 117         ND_PRINT("%s: %s %s on ",
 118             tok2str(pf_reasons, "unkn(%u)", GET_U_1(hdr->reason)),
 119             tok2str(pf_actions, "unkn(%u)", GET_U_1(hdr->action)),
 120             tok2str(pf_directions, "unkn(%u)", GET_U_1(hdr->dir)));
 121         nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ);
 122         ND_PRINT(": ");
 123 }
 124
 125 void
 126 pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 127                const u_char *p)
 128 {
 129         u_int length = h->len;
 130         u_int hdrlen;
 131         u_int caplen = h->caplen;
 132         const struct pfloghdr *hdr;
 133         uint8_t af;
 134
 135         ndo->ndo_protocol = "pflog";
 136         /* check length */
 137         if (caplen < sizeof(uint8_t)) {
 138                 nd_print_trunc(ndo);
 139                 ndo->ndo_ll_hdr_len += h->caplen;
 140                 return;
 141         }
 142
 143         hdr = (const struct pfloghdr *)p;
 144         hdrlen = GET_U_1(hdr->length);
 145         if (hdrlen < MIN_PFLOG_HDRLEN) {
 146                 ND_PRINT("[pflog: invalid header length!]");
 147                 ndo->ndo_ll_hdr_len += hdrlen;  /* XXX: not really */
 148                 return;
 149         }
 150         hdrlen = roundup2(hdrlen, 4);
 151
 152         if (caplen < hdrlen) {
 153                 nd_print_trunc(ndo);
 154                 ndo->ndo_ll_hdr_len += hdrlen;  /* XXX: true? */
 155                 return;
 156         }
 157
 158         /* print what we know */
 159         ND_TCHECK_SIZE(hdr);
 160         if (ndo->ndo_eflag)
 161                 pflog_print(ndo, hdr);
 162
 163         /* skip to the real packet */
 164         af = GET_U_1(hdr->af);
 165         length -= hdrlen;
 166         caplen -= hdrlen;
 167         p += hdrlen;
 168         switch (af) {
 169
 170                 /*
 171                  * If there's a system that doesn't use the AF_INET
 172                  * from 4.2BSD, feel free to add its value to af.h
 173                  * and use it here.
 174                  *
 175                  * Hopefully, there isn't.
 176                  */
 177                 case BSD_AFNUM_INET:
 178                         ip_print(ndo, p, length);
 179                         break;
 180
 181                 /*
 182                  * Try all AF_INET6 values for all systems with pflog,
 183                  * including Darwin.
 184                  */
 185                 case BSD_AFNUM_INET6_BSD:
 186                 case BSD_AFNUM_INET6_FREEBSD:
 187                 case BSD_AFNUM_INET6_DARWIN:
 188                         ip6_print(ndo, p, length);
 189                         break;
 190
 191         default:
 192                 /* address family not handled, print raw packet */
 193                 if (!ndo->ndo_eflag)
 194                         pflog_print(ndo, hdr);
 195                 if (!ndo->ndo_suppress_default_print)
 196                         ND_DEFAULTPRINT(p, caplen);
 197         }
 198
 199         ndo->ndo_ll_hdr_len += hdrlen;
 200         return;
 201 trunc:
 202         nd_print_trunc(ndo);
 203         ndo->ndo_ll_hdr_len += hdrlen;
 204 }