summaryrefslogtreecommitdiffstats
path: root/print-pflog.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--print-pflog.c206
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;
+}