forked from osmocom/wireshark
a4c8ebc18b
Have all dissector tables have a "supports Decode As" flag, which defaults to FALSE, and which is set to TRUE if a register_decode_as() refers to it. When adding a dissector to a dissector table with a given key, only add it for Decode As if the dissector table supports it. For non-FT_STRING dissector tables, always check for multiple entries for the same protocol with different dissectors, and report an error if we found them. This means there's no need for the creator of a dissector table to specify whether duplicates of that sort should be allowed - we always do the check when registering something for "Decode As" (in a non-FT_STRING dissector table), and just don't bother registering anything for "Decode As" if the dissector table doesn't support "Decode As", so there's no check done for those dissector tables. Change-Id: I4a1fdea3bddc2af27a65cfbca23edc99b26c0eed Reviewed-on: https://code.wireshark.org/review/17402 Petri-Dish: Guy Harris <guy@alum.mit.edu> Reviewed-by: Guy Harris <guy@alum.mit.edu>
131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/*
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* packet-bctp.c
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* Q.1990 BICC bearer control tunnelling protocol
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*
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* (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Ref ITU-T Rec. Q.1990 (07/2001)
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*/
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#include "config.h"
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#include <epan/packet.h>
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#define PNAME "BCTP Q.1990"
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#define PSNAME "BCTP"
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#define PFNAME "bctp"
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void proto_register_bctp(void);
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void proto_reg_handoff_bctp(void);
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static int proto_bctp = -1;
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static int hf_bctp_bvei = -1;
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static int hf_bctp_bvi = -1;
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static int hf_bctp_tpei = -1;
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static int hf_bctp_tpi = -1;
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static gint ett_bctp = -1;
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static dissector_table_t bctp_dissector_table;
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static dissector_handle_t text_handle;
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/*
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static const range_string tpi_vals[] = {
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{0x00,0x17,"spare (binary encoded protocols)"},
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{0x18,0x1f,"reserved for national use (binary encoded protocols)"},
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{0x20,0x20,"IPBCP (text encoded)"},
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{0x21,0x21,"spare (text encoded protocol)"},
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{0x22,0x22,"not used"},
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{0x23,0x37,"spare (text encoded protocols)"},
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{0x38,0x3f,"reserved for national use (text encoded protocols)"},
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{0,0,NULL}
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};
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*/
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static const value_string bvei_vals[] = {
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{0,"No indication"},
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{0,"Version Error Indication, BCTP version not supported"},
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{0,NULL}
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};
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static int dissect_bctp(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_) {
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proto_item* pi = proto_tree_add_item(tree, proto_bctp, tvb,0,2, ENC_NA);
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proto_tree* pt = proto_item_add_subtree(pi,ett_bctp);
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tvbuff_t* sub_tvb = tvb_new_subset_remaining(tvb, 2);
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guint8 tpi = tvb_get_guint8(tvb,1) & 0x3f;
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proto_tree_add_item(pt, hf_bctp_bvei, tvb,0,2, ENC_BIG_ENDIAN);
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proto_tree_add_item(pt, hf_bctp_bvi, tvb,0,2, ENC_BIG_ENDIAN);
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proto_tree_add_item(pt, hf_bctp_tpei, tvb,0,2, ENC_BIG_ENDIAN);
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proto_tree_add_item(pt, hf_bctp_tpi, tvb,0,2, ENC_BIG_ENDIAN);
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if (!dissector_try_uint(bctp_dissector_table, tpi, sub_tvb, pinfo, tree) ) {
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if (tpi <= 0x22) {
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call_data_dissector(sub_tvb, pinfo, tree);
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} else {
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/* tpi > 0x22 */
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call_dissector(text_handle,sub_tvb, pinfo, tree);
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}
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_bctp (void)
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{
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static hf_register_info hf[] = {
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{&hf_bctp_bvei, {"BVEI", "bctp.bvei", FT_UINT16, BASE_HEX, VALS(bvei_vals), 0x4000, "BCTP Version Error Indicator", HFILL }},
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{&hf_bctp_bvi, {"BVI", "bctp.bvi", FT_UINT16, BASE_HEX, NULL, 0x1F00, "BCTP Version Indicator", HFILL }},
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{&hf_bctp_tpei, {"TPEI", "bctp.tpei", FT_UINT16, BASE_HEX, NULL, 0x0040, "Tunneled Protocol Error Indicator", HFILL }},
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{&hf_bctp_tpi, {"TPI", "bctp.tpi", FT_UINT16, BASE_HEX, NULL, 0x003F, "Tunneled Protocol Indicator", HFILL }},
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};
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static gint *ett[] = {
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&ett_bctp
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};
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proto_bctp = proto_register_protocol(PNAME, PSNAME, PFNAME);
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proto_register_field_array(proto_bctp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("bctp", dissect_bctp, proto_bctp);
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bctp_dissector_table = register_dissector_table("bctp.tpi", "BCTP Tunneled Protocol Indicator", proto_bctp, FT_UINT32, BASE_DEC);
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}
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void
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proto_reg_handoff_bctp(void)
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{
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text_handle = find_dissector_add_dependency("data-text-lines", proto_bctp);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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