forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
They already know who they are when they register themselves. Saving the handle then to avoid finding it later. Not sure if this will increase unnecessary register_dissector functions (instead of using create_dissector_handle in proto_reg_handoff function) when other dissectors copy/paste, but it should make startup time a few microseconds better. Change-Id: I3839be791b32b84887ac51a6a65fb5733e9f1f43 Reviewed-on: https://code.wireshark.org/review/19481 Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Anders Broman <a.broman58@gmail.com>
251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
/* packet-interlink.c
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* Routines for Interlink protocol packet disassembly
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* By Uwe Girlich <uwe.girlich@philosys.de>
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* Copyright 2010 Uwe Girlich
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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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#include "config.h"
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#include <epan/packet.h>
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void proto_register_interlink(void);
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void proto_reg_handoff_interlink(void);
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/*
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* No public information available.
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*/
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static int proto_interlink = -1;
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static int hf_interlink_id = -1;
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static int hf_interlink_version = -1;
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static int hf_interlink_cmd = -1;
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static int hf_interlink_seq = -1;
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static int hf_interlink_flags = -1;
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static int hf_interlink_flags_req_ack = -1;
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static int hf_interlink_flags_inc_ack_port = -1;
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static int hf_interlink_block_type = -1;
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static int hf_interlink_block_version = -1;
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static int hf_interlink_block_length = -1;
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static gint ett_interlink = -1;
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static gint ett_interlink_header = -1;
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static gint ett_interlink_flags = -1;
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static gint ett_interlink_block = -1;
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static dissector_handle_t data_handle;
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static dissector_table_t subdissector_table;
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static dissector_handle_t interlink_handle;
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static const true_false_string flags_set_notset = {
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"Set", "Not set"
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};
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static const value_string names_cmd[] = {
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{ 1, "Data" },
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{ 2, "Ack" },
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{ 0, NULL }
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};
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static int
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dissect_interlink(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0;
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proto_tree *il_tree;
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proto_item *il_item;
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proto_tree *ilh_tree = NULL;
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proto_tree *ilb_tree = NULL;
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guint8 ilb_type;
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guint8 ilb_version;
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guint16 type_version = 0;
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dissector_handle_t handle;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "INTERLINK");
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col_clear(pinfo->cinfo, COL_INFO);
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il_item = proto_tree_add_item(tree, proto_interlink,
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tvb, 0, 16, ENC_NA);
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il_tree = proto_item_add_subtree(il_item, ett_interlink);
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ilh_tree = proto_tree_add_subtree(il_tree, tvb, 0, 12, ett_interlink_header, NULL, "Interlink Header");
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if (ilh_tree) {
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proto_tree_add_item(ilh_tree, hf_interlink_id, tvb, offset, 4, ENC_ASCII|ENC_NA);
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offset += 4;
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proto_tree_add_item(ilh_tree, hf_interlink_version, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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proto_tree_add_item(ilh_tree, hf_interlink_cmd, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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proto_tree_add_item(ilh_tree, hf_interlink_seq, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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} else {
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offset += 10;
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}
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if (ilh_tree) {
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static const int * flags[] = {
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&hf_interlink_flags_req_ack,
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&hf_interlink_flags_inc_ack_port,
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NULL
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};
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proto_tree_add_bitmask(ilh_tree, tvb, offset, hf_interlink_flags, ett_interlink_flags, flags, ENC_LITTLE_ENDIAN);
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}
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offset += 2;
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ilb_tree = proto_tree_add_subtree(il_tree, tvb, offset, 4, ett_interlink_block, NULL, "Block Header");
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ilb_type = tvb_get_guint8(tvb, offset);
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ilb_version = tvb_get_guint8(tvb, offset + 1);
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type_version = ilb_type << 8 | ilb_version;
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col_append_fstr(pinfo->cinfo, COL_INFO, "Type: %d, Version: %d",
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ilb_type, ilb_version);
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if (ilb_tree) {
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proto_tree_add_item(ilb_tree, hf_interlink_block_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(ilb_tree, hf_interlink_block_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(ilb_tree, hf_interlink_block_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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} else {
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offset += 4;
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}
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/* Generate a new tvb for the rest. */
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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/* Probably a sub-dissector exists for this type/version combination. */
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handle = dissector_get_uint_handle(subdissector_table, type_version);
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/* Without a proper sub-dissector, we use "data". */
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if (handle == NULL) handle = data_handle;
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/* Call the sub-dissector. */
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call_dissector(handle, next_tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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static gboolean
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dissect_interlink_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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if (!tvb_bytes_exist(tvb, 0, 4)) {
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return FALSE;
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}
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if (
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tvb_get_guint8(tvb,0) != 'I' ||
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tvb_get_guint8(tvb,1) != 'L' ||
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tvb_get_guint8(tvb,2) != 'N' ||
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tvb_get_guint8(tvb,3) != 'K'
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)
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return FALSE;
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dissect_interlink(tvb, pinfo, tree, data);
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return TRUE;
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}
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void
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proto_register_interlink(void)
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{
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static hf_register_info hf[] = {
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{ &hf_interlink_id, {
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"Magic ID", "interlink.id", FT_STRING,
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BASE_NONE, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_version, {
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"Version", "interlink.version", FT_UINT16,
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BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_cmd, {
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"Command", "interlink.cmd", FT_UINT16,
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BASE_DEC, VALS(names_cmd), 0, NULL, HFILL }},
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{ &hf_interlink_seq, {
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"Sequence", "interlink.seq", FT_UINT16,
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BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_flags, {
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"Flags", "interlink.flags", FT_UINT16,
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BASE_HEX, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_flags_req_ack, {
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"REQ_ACK", "interlink.flags.req_ack", FT_BOOLEAN,
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16, TFS(&flags_set_notset), 0x01, NULL, HFILL }},
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{ &hf_interlink_flags_inc_ack_port, {
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"INC_ACK_PORT", "interlink.flags.inc_ack_port", FT_BOOLEAN,
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16, TFS(&flags_set_notset), 0x02, NULL, HFILL }},
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{ &hf_interlink_block_type, {
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"Type", "interlink.type", FT_UINT8,
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BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_block_version, {
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"Version", "interlink.block_version", FT_UINT8,
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BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_interlink_block_length, {
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"Length", "interlink.length", FT_UINT16,
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BASE_DEC, NULL, 0, NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_interlink,
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&ett_interlink_header,
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&ett_interlink_flags,
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&ett_interlink_block,
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};
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proto_interlink = proto_register_protocol("Interlink Protocol",
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"Interlink",
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"interlink");
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proto_register_field_array(proto_interlink, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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interlink_handle = register_dissector("interlink", dissect_interlink, proto_interlink);
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/* Probably someone will write sub-dissectors. You can never know. */
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subdissector_table = register_dissector_table("interlink.type_version",
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"Interlink type_version", proto_interlink, FT_UINT16, BASE_HEX);
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}
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void
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proto_reg_handoff_interlink(void)
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{
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/* Allow "Decode As" with any UDP packet. */
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dissector_add_for_decode_as_with_preference("udp.port", interlink_handle);
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/* Add our heuristic packet finder. */
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heur_dissector_add("udp", dissect_interlink_heur, "Interlink over UDP", "interlink_udp", proto_interlink, HEURISTIC_ENABLE);
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data_handle = find_dissector("data");
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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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