forked from osmocom/wireshark
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/* packet-snaeth.c
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* Routines for SNA-over-Ethernet (Ethernet type 80d5)
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*
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* $Id: packet-snaeth.c,v 1.4 2002/08/28 21:00:34 jmayer Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 <glib.h>
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#include <epan/packet.h>
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#include "etypes.h"
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/*
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* See
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*
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* http://www.cisco.com/univercd/cc/td/doc/product/software/ssr90/rpc_r/18059.pdf
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*/
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static int proto_snaeth = -1;
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static int hf_snaeth_len = -1;
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static gint ett_snaeth = -1;
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static dissector_handle_t llc_handle;
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static void
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dissect_snaeth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *snaeth_tree;
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proto_item *snaeth_ti;
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guint16 len;
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tvbuff_t *next_tvb;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SNAETH");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "SNA over Ethernet");
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/* length */
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len = tvb_get_ntohs(tvb, 0);
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if (tree) {
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snaeth_ti = proto_tree_add_item(tree, proto_snaeth, tvb, 0, 3,
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FALSE);
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snaeth_tree = proto_item_add_subtree(snaeth_ti, ett_snaeth);
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proto_tree_add_uint(snaeth_tree, hf_snaeth_len, tvb, 0, 2, len);
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proto_tree_add_text(snaeth_tree, tvb, 2, 1, "Padding");
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}
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/*
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* Adjust the length of this tvbuff to include only the SNA-over-
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* Ethernet header and data.
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*/
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set_actual_length(tvb, 3 + len);
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/*
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* Rest of packet starts with an 802.2 LLC header.
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*/
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next_tvb = tvb_new_subset(tvb, 3, -1, -1);
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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}
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void
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proto_register_snaeth(void)
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{
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static hf_register_info hf[] = {
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{ &hf_snaeth_len,
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{ "Length", "snaeth_len", FT_UINT16, BASE_DEC, NULL, 0x0,
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"Length of LLC payload", HFILL }},
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};
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static gint *ett[] = {
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&ett_snaeth,
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};
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proto_snaeth = proto_register_protocol("SNA-over-Ethernet",
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"SNAETH", "snaeth");
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proto_register_field_array(proto_snaeth, 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_snaeth(void)
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{
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dissector_handle_t snaeth_handle;
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/*
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* Get handle for the LLC dissector.
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*/
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llc_handle = find_dissector("llc");
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snaeth_handle = create_dissector_handle(dissect_snaeth, proto_snaeth);
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dissector_add("ethertype", ETHERTYPE_SNA, snaeth_handle);
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}
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