![Jörg Mayer](/assets/img/avatar_default.png)
some warning fixes packet-http.c set headers.content_length = 0 before the first potential use of it. packet-kink.c "ifdef kerberos" around one function declaration packet-nbns.c set headers.{dgm_length|pkt_offset|error_code} = 0 packet-pflog.c delete capture_pflog and capture_old_pflog which aren't used anymore in the code. svn path=/trunk/; revision=21120
399 lines
13 KiB
C
399 lines
13 KiB
C
/* packet-pflog.c
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* Routines for pflog (OpenBSD Firewall Logging) packet disassembly
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*
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* $Id$
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*
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* Copyright 2001 Mike Frantzen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/addr_resolv.h>
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#include "packet-ip.h"
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#include "packet-ipv6.h"
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#include "packet-pflog.h"
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#ifndef offsetof
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/* Can't trust stddef.h to be there for us */
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# define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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#ifndef BPF_WORDALIGN
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#define BPF_ALIGNMENT sizeof(long)
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#define BPF_WORDALIGN(x) (((x) + (BPF_ALIGNMENT - 1)) & ~(BPF_ALIGNMENT - 1))
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#endif
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static dissector_handle_t data_handle, ip_handle, ipv6_handle;
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/* header fields */
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static int proto_pflog = -1;
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static int hf_pflog_length = -1;
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static int hf_pflog_af = -1;
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static int hf_pflog_action = -1;
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static int hf_pflog_reason = -1;
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static int hf_pflog_ifname = -1;
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static int hf_pflog_ruleset = -1;
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static int hf_pflog_rulenr = -1;
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static int hf_pflog_subrulenr = -1;
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static int hf_pflog_dir = -1;
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static gint ett_pflog = -1;
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/* old header */
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static int proto_old_pflog = -1;
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static int hf_old_pflog_af = -1;
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static int hf_old_pflog_ifname = -1;
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static int hf_old_pflog_rnr = -1;
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static int hf_old_pflog_reason = -1;
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static int hf_old_pflog_action = -1;
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static int hf_old_pflog_dir = -1;
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static gint ett_old_pflog = -1;
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static const value_string af_vals[] = {
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{ BSD_PF_INET, "IPv4" },
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{ BSD_PF_INET6, "IPv6" },
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{ 0, NULL }
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};
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static const value_string reason_vals[] = {
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{ 0, "match" },
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{ 1, "bad-offset" },
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{ 2, "fragment" },
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{ 3, "short" },
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{ 4, "normalize" },
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{ 5, "memory" },
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{ 0, NULL }
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};
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static const value_string action_vals[] = {
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{ PF_PASS, "passed" },
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{ PF_DROP, "dropped" },
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{ PF_SCRUB, "scrubbed" },
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{ 0, NULL }
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};
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static const value_string old_dir_vals[] = {
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{ PF_OLD_IN, "in" },
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{ PF_OLD_OUT, "out" },
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{ 0, NULL }
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};
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static const value_string dir_vals[] = {
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{ PF_INOUT, "inout" },
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{ PF_IN, "in" },
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{ PF_OUT, "out" },
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{ 0, NULL }
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};
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static void
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dissect_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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#define MAX_RULE_STR 128
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struct pfloghdr pflogh;
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static char rulestr[MAX_RULE_STR];
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tvbuff_t *next_tvb;
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proto_tree *pflog_tree;
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proto_item *ti;
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int hdrlen;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG");
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/* Copy out the pflog header to insure alignment */
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tvb_memcpy(tvb, (guint8 *)&pflogh, 0, sizeof(pflogh));
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/* Byteswap the header now */
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pflogh.rulenr = g_ntohl(pflogh.rulenr);
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pflogh.subrulenr = g_ntohl(pflogh.subrulenr);
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hdrlen = BPF_WORDALIGN(pflogh.length);
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if (pflogh.subrulenr == (guint32) -1)
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g_snprintf(rulestr, sizeof(rulestr), "%u",
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pflogh.rulenr);
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else
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g_snprintf(rulestr, sizeof(rulestr), "%u.%s.%u",
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pflogh.rulenr, pflogh.ruleset, pflogh.subrulenr);
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if (hdrlen < MIN_PFLOG_HDRLEN) {
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_pflog, tvb, 0,
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hdrlen, "PF Log invalid header length (%u)", hdrlen);
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_prepend_fstr(pinfo->cinfo, COL_INFO, "Invalid header length %u",
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hdrlen);
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}
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return;
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}
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_pflog, tvb, 0,
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hdrlen,
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"PF Log %s %s on %s by rule %s",
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val_to_str(pflogh.af, af_vals, "unknown (%u)"),
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val_to_str(pflogh.action, action_vals, "unknown (%u)"),
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pflogh.ifname,
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rulestr);
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pflog_tree = proto_item_add_subtree(ti, ett_pflog);
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proto_tree_add_uint(pflog_tree, hf_pflog_length, tvb,
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offsetof(struct pfloghdr, length), sizeof(pflogh.length),
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pflogh.length);
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proto_tree_add_uint(pflog_tree, hf_pflog_af, tvb,
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offsetof(struct pfloghdr, af), sizeof(pflogh.af),
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pflogh.af);
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proto_tree_add_uint(pflog_tree, hf_pflog_action, tvb,
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offsetof(struct pfloghdr, action), sizeof(pflogh.action),
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pflogh.action);
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proto_tree_add_uint(pflog_tree, hf_pflog_reason, tvb,
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offsetof(struct pfloghdr, reason), sizeof(pflogh.reason),
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pflogh.reason);
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proto_tree_add_string(pflog_tree, hf_pflog_ifname, tvb,
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offsetof(struct pfloghdr, ifname), sizeof(pflogh.ifname),
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pflogh.ifname);
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proto_tree_add_string(pflog_tree, hf_pflog_ruleset, tvb,
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offsetof(struct pfloghdr, ruleset), sizeof(pflogh.ruleset),
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pflogh.ruleset);
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proto_tree_add_int(pflog_tree, hf_pflog_rulenr, tvb,
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offsetof(struct pfloghdr, rulenr), sizeof(pflogh.rulenr),
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pflogh.rulenr);
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proto_tree_add_int(pflog_tree, hf_pflog_subrulenr, tvb,
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offsetof(struct pfloghdr, subrulenr), sizeof(pflogh.subrulenr),
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pflogh.subrulenr);
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proto_tree_add_uint(pflog_tree, hf_pflog_dir, tvb,
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offsetof(struct pfloghdr, dir), sizeof(pflogh.dir),
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pflogh.dir);
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}
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/* Set the tvbuff for the payload after the header */
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next_tvb = tvb_new_subset(tvb, hdrlen, -1, -1);
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switch (pflogh.af) {
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case BSD_PF_INET:
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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break;
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case BSD_PF_INET6:
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call_dissector(ipv6_handle, next_tvb, pinfo, tree);
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break;
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default:
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call_dissector(data_handle, next_tvb, pinfo, tree);
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break;
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/%s] ",
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val_to_str(pflogh.action, action_vals, "unknown (%u)"),
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pflogh.ifname,
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rulestr);
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}
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}
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void
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proto_register_pflog(void)
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{
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static hf_register_info hf[] = {
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{ &hf_pflog_length,
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{ "Header Length", "pflog.length", FT_UINT8, BASE_DEC, NULL, 0x0,
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"Length of Header", HFILL }},
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{ &hf_pflog_af,
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{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
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"Protocol (IPv4 vs IPv6)", HFILL }},
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{ &hf_pflog_action,
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{ "Action", "pflog.action", FT_UINT8, BASE_DEC, VALS(action_vals), 0x0,
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"Action taken by PF on the packet", HFILL }},
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{ &hf_pflog_reason,
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{ "Reason", "pflog.reason", FT_UINT8, BASE_DEC, VALS(reason_vals), 0x0,
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"Reason for logging the packet", HFILL }},
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{ &hf_pflog_ifname,
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{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
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"Interface", HFILL }},
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{ &hf_pflog_ruleset,
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{ "Ruleset", "pflog.ruleset", FT_STRING, BASE_NONE, NULL, 0x0,
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"Ruleset name in anchor", HFILL }},
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{ &hf_pflog_rulenr,
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{ "Rule Number", "pflog.rulenr", FT_INT32, BASE_DEC, NULL, 0x0,
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"Last matched firewall main ruleset rule number", HFILL }},
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{ &hf_pflog_subrulenr,
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{ "Sub Rule Number", "pflog.subrulenr", FT_INT32, BASE_DEC, NULL, 0x0,
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"Last matched firewall anchored ruleset rule number", HFILL }},
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{ &hf_pflog_dir,
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{ "Direction", "pflog.dir", FT_UINT8, BASE_DEC, VALS(dir_vals), 0x0,
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"Direction of packet in stack (inbound versus outbound)", HFILL }},
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};
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static gint *ett[] = { &ett_pflog };
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proto_pflog = proto_register_protocol("OpenBSD Packet Filter log file",
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"PFLOG", "pflog");
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proto_register_field_array(proto_pflog, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_pflog(void)
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{
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dissector_handle_t pflog_handle;
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ip_handle = find_dissector("ip");
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ipv6_handle = find_dissector("ipv6");
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data_handle = find_dissector("data");
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pflog_handle = create_dissector_handle(dissect_pflog, proto_pflog);
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dissector_add("wtap_encap", WTAP_ENCAP_PFLOG, pflog_handle);
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}
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static void
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dissect_old_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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struct old_pfloghdr pflogh;
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tvbuff_t *next_tvb;
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proto_tree *pflog_tree;
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proto_item *ti;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG-OLD");
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/* Copy out the pflog header to insure alignment */
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tvb_memcpy(tvb, (guint8 *)&pflogh, 0, sizeof(pflogh));
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/* Byteswap the header now */
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pflogh.af = g_ntohl(pflogh.af);
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pflogh.rnr = g_ntohs(pflogh.rnr);
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pflogh.reason = g_ntohs(pflogh.reason);
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pflogh.action = g_ntohs(pflogh.action);
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pflogh.dir = g_ntohs(pflogh.dir);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_old_pflog, tvb, 0,
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OLD_PFLOG_HDRLEN,
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"PF Log (pre 3.4) %s %s on %s by rule %d",
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val_to_str(pflogh.af, af_vals, "unknown (%u)"),
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val_to_str(pflogh.action, action_vals, "unknown (%u)"),
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pflogh.ifname,
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pflogh.rnr);
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pflog_tree = proto_item_add_subtree(ti, ett_pflog);
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proto_tree_add_uint(pflog_tree, hf_old_pflog_af, tvb,
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offsetof(struct old_pfloghdr, af), sizeof(pflogh.af),
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pflogh.af);
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proto_tree_add_int(pflog_tree, hf_old_pflog_rnr, tvb,
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offsetof(struct old_pfloghdr, rnr), sizeof(pflogh.rnr),
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pflogh.rnr);
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proto_tree_add_string(pflog_tree, hf_old_pflog_ifname, tvb,
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offsetof(struct old_pfloghdr, ifname), sizeof(pflogh.ifname),
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pflogh.ifname);
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proto_tree_add_uint(pflog_tree, hf_old_pflog_reason, tvb,
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offsetof(struct old_pfloghdr, reason), sizeof(pflogh.reason),
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pflogh.reason);
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proto_tree_add_uint(pflog_tree, hf_old_pflog_action, tvb,
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offsetof(struct old_pfloghdr, action), sizeof(pflogh.action),
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pflogh.action);
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proto_tree_add_uint(pflog_tree, hf_old_pflog_dir, tvb,
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offsetof(struct old_pfloghdr, dir), sizeof(pflogh.dir),
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pflogh.dir);
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}
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/* Set the tvbuff for the payload after the header */
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next_tvb = tvb_new_subset(tvb, OLD_PFLOG_HDRLEN, -1, -1);
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switch (pflogh.af) {
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case BSD_PF_INET:
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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break;
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case BSD_PF_INET6:
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call_dissector(ipv6_handle, next_tvb, pinfo, tree);
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break;
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default:
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call_dissector(data_handle, next_tvb, pinfo, tree);
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break;
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/#%d] ",
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val_to_str(pflogh.action, action_vals, "unknown (%u)"),
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pflogh.ifname,
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pflogh.rnr);
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}
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}
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void
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proto_register_old_pflog(void)
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{
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static hf_register_info hf[] = {
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{ &hf_old_pflog_af,
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{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(af_vals), 0x0,
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"Protocol (IPv4 vs IPv6)", HFILL }},
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{ &hf_old_pflog_ifname,
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{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
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"Interface", HFILL }},
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{ &hf_old_pflog_rnr,
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{ "Rule Number", "pflog.rnr", FT_INT16, BASE_DEC, NULL, 0x0,
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"Last matched firewall rule number", HFILL }},
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{ &hf_old_pflog_reason,
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{ "Reason", "pflog.reason", FT_UINT16, BASE_DEC, VALS(reason_vals), 0x0,
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"Reason for logging the packet", HFILL }},
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{ &hf_old_pflog_action,
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{ "Action", "pflog.action", FT_UINT16, BASE_DEC, VALS(action_vals), 0x0,
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"Action taken by PF on the packet", HFILL }},
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{ &hf_old_pflog_dir,
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{ "Direction", "pflog.dir", FT_UINT16, BASE_DEC, VALS(old_dir_vals), 0x0,
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"Direction of packet in stack (inbound versus outbound)", HFILL }},
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};
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static gint *ett[] = { &ett_old_pflog };
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proto_old_pflog = proto_register_protocol(
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"OpenBSD Packet Filter log file, pre 3.4",
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"PFLOG-OLD", "pflog-old");
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proto_register_field_array(proto_old_pflog, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_old_pflog(void)
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{
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dissector_handle_t pflog_handle;
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ip_handle = find_dissector("ip");
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ipv6_handle = find_dissector("ipv6");
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data_handle = find_dissector("data");
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pflog_handle = create_dissector_handle(dissect_old_pflog, proto_old_pflog);
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dissector_add("wtap_encap", WTAP_ENCAP_OLD_PFLOG, pflog_handle);
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}
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