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/* packet-bat-gw.c
* Routines for B.A.T.M.A.N. Layer 3 dissection
* Copyright 2008, Sven Eckelmann <sven.eckelmann@gmx.de>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "packet-bat.h"
#include <epan/addr_resolv.h>
static gint ett_bat_gw = -1;
static dissector_handle_t ip_handle;
static dissector_handle_t data_handle;
static int hf_bat_gw_type = -1;
static int hf_bat_gw_ip = -1;
static guint global_bat_gw_udp_port = BAT_GW_PORT;
static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static const value_string packettypenames[] = {
{ TUNNEL_DATA, "DATA" },
{ TUNNEL_IP_REQUEST, "IP_REQUEST" },
{ TUNNEL_IP_INVALID, "IP_INVALID" },
{ TUNNEL_KEEPALIVE_REQUEST, "KEEPALIVE_REQUEST" },
{ TUNNEL_KEEPALIVE_REPLY, "KEEPALIVE_REPLY" },
{ 0, NULL }
};
void register_bat_gw()
{
static hf_register_info hf[] = {
{ &hf_bat_gw_type,
{ "Type", "bat.gw.type",
FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
"", HFILL }
},
{ &hf_bat_gw_ip,
{ "IP", "bat.gw.ip",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bat_gw
};
proto_register_subtree_array(ett, array_length(ett));
proto_register_field_array(proto_bat_plugin, hf, array_length(hf));
prefs_register_uint_preference(bat_module, "batman.gw.port", "GW UDP Port",
"Set the port for B.A.T.M.A.N. Gateway "
"messages (if other than the default of 4306)",
10, &global_bat_gw_udp_port);
}
void reg_handoff_bat_gw(void)
{
static gboolean inited = FALSE;
static dissector_handle_t gw_handle;
static guint udp_port;
if (!inited) {
gw_handle = create_dissector_handle(dissect_bat_gw, proto_bat_plugin);
ip_handle = find_dissector("ip");
data_handle = find_dissector("data");
inited = TRUE;
} else {
dissector_delete("udp.port", udp_port, gw_handle);
}
udp_port = global_bat_gw_udp_port;
dissector_add("udp.port", udp_port, gw_handle);
}
static void dissect_bat_gw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
struct gw_packet *gw_packeth;
const guint8 *ip_addr;
guint32 ip;
tvbuff_t *next_tvb;
guint length_remaining;
int offset = 0;
gw_packeth = ep_alloc(sizeof(struct gw_packet));
gw_packeth->type = tvb_get_guint8(tvb, 0);
ip = tvb_get_ipv4(tvb, 1);
ip_addr = tvb_get_ptr(tvb, 1, 4);
/* set protocol name */
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_GW");
}
/* Set info column */
if (check_col(pinfo->cinfo, COL_INFO)) {
col_clear(pinfo->cinfo, COL_INFO);
col_append_fstr(pinfo->cinfo, COL_INFO, "Type=%s",
val_to_str(gw_packeth->type, packettypenames, "Unknown (0x%02x)"));
if (ip != 0) {
col_append_fstr(pinfo->cinfo, COL_INFO, " IP: %s (%s)",
get_hostname(ip), ip_to_str(ip_addr));
}
}
/* Set tree info */
if (tree) {
proto_item *ti = NULL;
proto_tree *bat_gw_entry_tree = NULL;
if (PTREE_DATA(tree)->visible) {
ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 1,
"B.A.T.M.A.N. GW [%s]",
val_to_str(gw_packeth->type, packettypenames, "Unknown (0x%02x)"));
} else {
ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 1, FALSE);
}
bat_gw_entry_tree = proto_item_add_subtree(ti, ett_bat_gw);
proto_tree_add_item(bat_gw_entry_tree, hf_bat_gw_type, tvb, offset, 1, FALSE);
offset += 1;
if (ip != 0) {
proto_tree_add_ipv4(bat_gw_entry_tree, hf_bat_gw_ip, tvb, offset, 4, ip);
offset += 4;
}
}
length_remaining = tvb_length_remaining(tvb, offset);
if (length_remaining != 0) {
next_tvb = tvb_new_subset(tvb, offset, length_remaining, length_remaining);
if (have_tap_listener(bat_follow_tap)) {
tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
}
if (gw_packeth->type == TUNNEL_DATA) {
call_dissector(ip_handle, next_tvb, pinfo, tree);
} else {
call_dissector(data_handle, next_tvb, pinfo, tree);
}
}
}
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