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Diffstat (limited to '')
| -rw-r--r-- | print-pflog.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/print-pflog.c b/print-pflog.c new file mode 100644 index 0000000..1cffbf6 --- /dev/null +++ b/print-pflog.c @@ -0,0 +1,206 @@ +/* + * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code distributions + * retain the above copyright notice and this paragraph in its entirety, (2) + * distributions including binary code include the above copyright notice and + * this paragraph in its entirety in the documentation or other materials + * provided with the distribution, and (3) all advertising materials mentioning + * features or use of this software display the following acknowledgement: + * ``This product includes software developed by the University of California, + * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of + * the University nor the names of its contributors may be used to endorse + * or promote products derived from this software without specific prior + * written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* \summary: *BSD/Darwin packet filter log file printer */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "netdissect-stdinc.h" + +#include "netdissect.h" +#include "extract.h" +#include "af.h" + +#include "pflog.h" + +static const struct tok pf_reasons[] = { + { PFRES_MATCH, "0(match)" }, + { PFRES_BADOFF, "1(bad-offset)" }, + { PFRES_FRAG, "2(fragment)" }, + { PFRES_NORM, "3(short)" }, + { PFRES_NORM, "4(normalize)" }, + { PFRES_MEMORY, "5(memory)" }, + { PFRES_TS, "6(bad-timestamp)" }, + { PFRES_CONGEST, "7(congestion)" }, + { PFRES_IPOPTIONS, "8(ip-option)" }, + { PFRES_PROTCKSUM, "9(proto-cksum)" }, + { PFRES_BADSTATE, "10(state-mismatch)" }, + { PFRES_STATEINS, "11(state-insert)" }, + { PFRES_MAXSTATES, "12(state-limit)" }, + { PFRES_SRCLIMIT, "13(src-limit)" }, + { PFRES_SYNPROXY, "14(synproxy)" }, +#if defined(__FreeBSD__) + { PFRES_MAPFAILED, "15(map-failed)" }, +#elif defined(__NetBSD__) + { PFRES_STATELOCKED, "15(state-locked)" }, +#elif defined(__OpenBSD__) + { PFRES_TRANSLATE, "15(translate)" }, + { PFRES_NOROUTE, "16(no-route)" }, +#elif defined(__APPLE__) + { PFRES_DUMMYNET, "15(dummynet)" }, +#endif + { 0, NULL } +}; + +static const struct tok pf_actions[] = { + { PF_PASS, "pass" }, + { PF_DROP, "block" }, + { PF_SCRUB, "scrub" }, + { PF_NAT, "nat" }, + { PF_NONAT, "nonat" }, + { PF_BINAT, "binat" }, + { PF_NOBINAT, "nobinat" }, + { PF_RDR, "rdr" }, + { PF_NORDR, "nordr" }, + { PF_SYNPROXY_DROP, "synproxy-drop" }, +#if defined(__FreeBSD__) + { PF_DEFER, "defer" }, +#elif defined(__OpenBSD__) + { PF_DEFER, "defer" }, + { PF_MATCH, "match" }, + { PF_DIVERT, "divert" }, + { PF_RT, "rt" }, + { PF_AFRT, "afrt" }, +#elif defined(__APPLE__) + { PF_DUMMYNET, "dummynet" }, + { PF_NODUMMYNET, "nodummynet" }, + { PF_NAT64, "nat64" }, + { PF_NONAT64, "nonat64" }, +#endif + { 0, NULL } +}; + +static const struct tok pf_directions[] = { + { PF_INOUT, "in/out" }, + { PF_IN, "in" }, + { PF_OUT, "out" }, +#if defined(__OpenBSD__) + { PF_FWD, "fwd" }, +#endif + { 0, NULL } +}; + +static void +pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr) +{ + uint32_t rulenr, subrulenr; + + ndo->ndo_protocol = "pflog"; + rulenr = GET_BE_U_4(&hdr->rulenr); + subrulenr = GET_BE_U_4(&hdr->subrulenr); + if (subrulenr == (uint32_t)-1) + ND_PRINT("rule %u/", rulenr); + else { + ND_PRINT("rule %u.", rulenr); + nd_printjnp(ndo, (const u_char*)hdr->ruleset, PFLOG_RULESET_NAME_SIZE); + ND_PRINT(".%u/", subrulenr); + } + + ND_PRINT("%s: %s %s on ", + tok2str(pf_reasons, "unkn(%u)", GET_U_1(&hdr->reason)), + tok2str(pf_actions, "unkn(%u)", GET_U_1(&hdr->action)), + tok2str(pf_directions, "unkn(%u)", GET_U_1(&hdr->dir))); + nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ); + ND_PRINT(": "); +} + +void +pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, + const u_char *p) +{ + u_int length = h->len; + u_int hdrlen; + u_int caplen = h->caplen; + const struct pfloghdr *hdr; + uint8_t af; + + ndo->ndo_protocol = "pflog"; + /* check length */ + if (caplen < sizeof(uint8_t)) { + nd_print_trunc(ndo); + ndo->ndo_ll_hdr_len += h->caplen; + return; + } + +#define MIN_PFLOG_HDRLEN 45 + hdr = (const struct pfloghdr *)p; + if (GET_U_1(&hdr->length) < MIN_PFLOG_HDRLEN) { + ND_PRINT("[pflog: invalid header length!]"); + ndo->ndo_ll_hdr_len += GET_U_1(&hdr->length); /* XXX: not really */ + return; + } + hdrlen = roundup2(hdr->length, 4); + + if (caplen < hdrlen) { + nd_print_trunc(ndo); + ndo->ndo_ll_hdr_len += hdrlen; /* XXX: true? */ + return; + } + + /* print what we know */ + ND_TCHECK_SIZE(hdr); + if (ndo->ndo_eflag) + pflog_print(ndo, hdr); + + /* skip to the real packet */ + af = GET_U_1(&hdr->af); + length -= hdrlen; + caplen -= hdrlen; + p += hdrlen; + switch (af) { + + /* + * If there's a system that doesn't use the AF_INET + * from 4.2BSD, feel free to add its value to af.h + * and use it here. + * + * Hopefully, there isn't. + */ + case BSD_AFNUM_INET: + ip_print(ndo, p, length); + break; + + /* + * Try all AF_INET6 values for all systems with pflog, + * including Darwin. + */ + case BSD_AFNUM_INET6_BSD: + case BSD_AFNUM_INET6_FREEBSD: + case BSD_AFNUM_INET6_DARWIN: + ip6_print(ndo, p, length); + break; + + default: + /* address family not handled, print raw packet */ + if (!ndo->ndo_eflag) + pflog_print(ndo, hdr); + if (!ndo->ndo_suppress_default_print) + ND_DEFAULTPRINT(p, caplen); + } + + ndo->ndo_ll_hdr_len += hdrlen; + return; +trunc: + nd_print_trunc(ndo); + ndo->ndo_ll_hdr_len += hdrlen; +} |