2008-06-22 00:14:33 +00:00
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/* packet-bat-gw.c
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* Routines for B.A.T.M.A.N. Layer 3 dissection
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* Copyright 2008, Sven Eckelmann <sven.eckelmann@gmx.de>
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*
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* $Id$
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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 "packet-bat.h"
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#include <epan/addr_resolv.h>
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static gint ett_bat_gw = -1;
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static dissector_handle_t ip_handle;
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static dissector_handle_t data_handle;
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static int hf_bat_gw_type = -1;
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static int hf_bat_gw_ip = -1;
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static guint global_bat_gw_udp_port = BAT_GW_PORT;
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static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static const value_string packettypenames[] = {
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{ TUNNEL_DATA, "DATA" },
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{ TUNNEL_IP_REQUEST, "IP_REQUEST" },
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{ TUNNEL_IP_INVALID, "IP_INVALID" },
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{ TUNNEL_KEEPALIVE_REQUEST, "KEEPALIVE_REQUEST" },
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{ TUNNEL_KEEPALIVE_REPLY, "KEEPALIVE_REPLY" },
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2008-06-22 10:59:08 +00:00
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{ 0, NULL }
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2008-06-22 00:14:33 +00:00
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};
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void register_bat_gw()
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{
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static hf_register_info hf[] = {
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{ &hf_bat_gw_type,
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2008-06-22 10:59:08 +00:00
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{ "Type", "bat.gw.type",
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FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
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"", HFILL }
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2008-06-22 00:14:33 +00:00
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},
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{ &hf_bat_gw_ip,
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{ "IP", "bat.gw.ip",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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"", HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_bat_gw
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};
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proto_register_subtree_array(ett, array_length(ett));
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proto_register_field_array(proto_bat_plugin, hf, array_length(hf));
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2008-06-22 10:59:08 +00:00
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prefs_register_uint_preference(bat_module, "batman.gw.port", "GW UDP Port",
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2008-06-22 00:14:33 +00:00
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"Set the port for B.A.T.M.A.N. Gateway "
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"messages (if other than the default of 4306)",
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10, &global_bat_gw_udp_port);
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}
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void reg_handoff_bat_gw(void)
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{
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static gboolean inited = FALSE;
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static dissector_handle_t gw_handle;
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2008-09-26 20:06:40 +00:00
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static guint udp_port;
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2008-06-22 00:14:33 +00:00
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if (!inited) {
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gw_handle = create_dissector_handle(dissect_bat_gw, proto_bat_plugin);
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ip_handle = find_dissector("ip");
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data_handle = find_dissector("data");
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2008-07-09 19:10:54 +00:00
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inited = TRUE;
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2008-06-22 00:14:33 +00:00
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} else {
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dissector_delete("udp.port", udp_port, gw_handle);
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}
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udp_port = global_bat_gw_udp_port;
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dissector_add("udp.port", udp_port, gw_handle);
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}
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static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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struct gw_packet *gw_packeth;
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const guint8 *ip_addr;
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guint32 ip;
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tvbuff_t *next_tvb;
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guint length_remaining;
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int offset = 0;
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gw_packeth = ep_alloc(sizeof(struct gw_packet));
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gw_packeth->type = tvb_get_guint8(tvb, 0);
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ip = tvb_get_ipv4(tvb, 1);
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ip_addr = tvb_get_ptr(tvb, 1, 4);
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/* set protocol name */
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_GW");
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}
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/* Set info column */
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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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col_append_fstr(pinfo->cinfo, COL_INFO, "Type=%s",
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val_to_str(gw_packeth->type, packettypenames, "Unknown (0x%02x)"));
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if (ip != 0) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " IP: %s (%s)",
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get_hostname(ip), ip_to_str(ip_addr));
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}
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}
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/* Set tree info */
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if (tree) {
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proto_item *ti = NULL;
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proto_tree *bat_gw_entry_tree = NULL;
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if (PTREE_DATA(tree)->visible) {
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ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 1,
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"B.A.T.M.A.N. GW [%s]",
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val_to_str(gw_packeth->type, packettypenames, "Unknown (0x%02x)"));
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} else {
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ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 1, FALSE);
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}
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bat_gw_entry_tree = proto_item_add_subtree(ti, ett_bat_gw);
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proto_tree_add_item(bat_gw_entry_tree, hf_bat_gw_type, tvb, offset, 1, FALSE);
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offset += 1;
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if (ip != 0) {
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proto_tree_add_ipv4(bat_gw_entry_tree, hf_bat_gw_ip, tvb, offset, 4, ip);
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offset += 4;
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}
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}
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length_remaining = tvb_length_remaining(tvb, offset);
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if (length_remaining != 0) {
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next_tvb = tvb_new_subset(tvb, offset, length_remaining, length_remaining);
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if (have_tap_listener(bat_follow_tap)) {
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tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
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}
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if (gw_packeth->type == TUNNEL_DATA) {
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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} else {
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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}
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}
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