forked from osmocom/wireshark
108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/*
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* Copyright (c) 2003 Markus Friedl. 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: packet-ipsec-udp.c,v 1.4 2003/10/02 22:44:19 guy Exp $
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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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static int proto_udpencap = -1;
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static gint ett_udpencap = -1;
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static dissector_handle_t esp_handle;
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static dissector_handle_t isakmp_handle;
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/*
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* UDP Encapsulation of IPsec Packets
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* draft-ietf-ipsec-udp-encaps-06.txt
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*/
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static void
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dissect_udpencap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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proto_tree *udpencap_tree = NULL;
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proto_item *ti = NULL;
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guint32 spi;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "UDPENCAP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_udpencap, tvb, 0, -1, FALSE);
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udpencap_tree = proto_item_add_subtree(ti, ett_udpencap);
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}
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/* First byte of 0 iindicates NAT-keepalive */
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if (tvb_get_guint8(tvb, 0) == 0xff) {
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if (tree)
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proto_tree_add_text(udpencap_tree, tvb, 0, 1, "NAT-keepalive packet");
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} else {
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/* SPI of zero indicates IKE traffic, otherwise it's ESP */
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tvb_memcpy(tvb, (guint8 *)&spi, 0, sizeof(spi));
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if (spi == 0) {
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if (tree) {
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proto_tree_add_text(udpencap_tree, tvb, 0, sizeof(spi),
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"Non-ESP Marker");
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proto_item_set_len(ti, sizeof(spi));
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}
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next_tvb = tvb_new_subset(tvb, sizeof(spi), -1, -1);
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call_dissector(isakmp_handle, next_tvb, pinfo, tree);
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} else {
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if (tree)
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proto_item_set_len(ti, 0);
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call_dissector(esp_handle, tvb, pinfo, tree);
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}
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}
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}
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void
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proto_register_udpencap(void)
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{
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static gint *ett[] = {
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&ett_udpencap,
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};
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proto_udpencap = proto_register_protocol(
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"UDP Encapsulation of IPsec Packets", "UDPENCAP", "udpencap");
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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_udpencap(void)
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{
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dissector_handle_t udpencap_handle;
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esp_handle = find_dissector("esp");
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isakmp_handle = find_dissector("isakmp");
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udpencap_handle = create_dissector_handle(dissect_udpencap, proto_udpencap);
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dissector_add("udp.port", 4500, udpencap_handle);
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}
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