forked from osmocom/wireshark
127 lines
3.8 KiB
C
127 lines
3.8 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-etherip.c,v 1.2 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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#include "ipproto.h"
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static int proto_etherip = -1;
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static int hf_etherip_ver = -1;
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static gint ett_etherip = -1;
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static dissector_handle_t eth_handle;
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#ifndef offsetof
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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/*
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* RFC 3378: EtherIP: Tunneling Ethernet Frames in IP Datagrams
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*
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* Bits 0-3: Protocol version
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* Bits 4-15: Reserved for future use
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*/
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struct etheriphdr {
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guint8 ver; /* version/reserved */
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guint8 pad; /* required padding byte */
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};
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#define ETHERIP_VERS_MASK 0x0f
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static void
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dissect_etherip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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struct etheriphdr etheriph;
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tvbuff_t *next_tvb;
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proto_tree *etherip_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, "ETHERIP");
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/* Copy out the etherip header to insure alignment */
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tvb_memcpy(tvb, (guint8 *)ðeriph, 0, sizeof(etheriph));
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/* mask out reserved bits */
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etheriph.ver &= ETHERIP_VERS_MASK;
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_etherip, tvb, 0,
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sizeof(etheriph),
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"EtherIP, Version %d",
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etheriph.ver
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);
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etherip_tree = proto_item_add_subtree(ti, ett_etherip);
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proto_tree_add_uint(etherip_tree, hf_etherip_ver, tvb,
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offsetof(struct etheriphdr, ver), sizeof(etheriph.ver),
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etheriph.ver);
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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, sizeof(etheriph), -1, -1);
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call_dissector(eth_handle, next_tvb, pinfo, tree);
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}
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void
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proto_register_etherip(void)
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{
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static hf_register_info hf_etherip[] = {
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{ &hf_etherip_ver,
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{ "Version", "etherip.ver", FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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};
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static gint *ett[] = {
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&ett_etherip,
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};
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proto_etherip = proto_register_protocol("Ethernet over IP",
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"ETHERIP", "etherip");
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proto_register_field_array(proto_etherip, hf_etherip, array_length(hf_etherip));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("etherip", dissect_etherip, proto_etherip);
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}
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void
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proto_reg_handoff_etherip(void)
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{
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dissector_handle_t etherip_handle;
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eth_handle = find_dissector("eth");
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etherip_handle = find_dissector("etherip");
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dissector_add("ip.proto", IP_PROTO_ETHERIP, etherip_handle);
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}
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