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67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
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Serval DNA MDP overlay network link tracking
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Copyright (C) 2016 Flinders University
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Copyright (C) 2012-2013 Serval Project Inc.
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Copyright (C) 2010-2012 Paul Gardner-Stephen
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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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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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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 "serval.h"
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#include "conf.h"
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#include "route_link.h"
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#include "overlay_interface.h"
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#include "overlay_buffer.h"
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#include "debug.h"
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DEFINE_BINDING(MDP_PORT_STUN, overlay_mdp_service_stun);
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static int overlay_mdp_service_stun(struct internal_mdp_header *header, struct overlay_buffer *payload)
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{
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DEBUGF(overlayrouting, "Processing STUN info from %s", alloca_tohex_sid_t(header->source->sid));
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while(ob_remaining(payload)>0){
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struct subscriber *subscriber=NULL;
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// TODO explain addresses, link expiry time, resolve differences between addresses...
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if (overlay_address_parse(NULL, payload, &subscriber)){
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break;
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}
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struct socket_address addr;
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addr.addrlen = sizeof(addr.inet);
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addr.inet.sin_family = AF_INET;
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addr.inet.sin_addr.s_addr = ob_get_ui32(payload);
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addr.inet.sin_port = ob_get_ui16(payload);
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if (!subscriber || (subscriber->reachable&REACHABLE_DIRECT))
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continue;
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// only trust stun responses from our directory service or about the packet sender.
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if (directory_service == header->source || subscriber == header->source){
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overlay_interface *interface = overlay_interface_find(addr.inet.sin_addr, 1);
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if (!interface){
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WARNF("Can't find interface for %s", alloca_socket_address(&addr));
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return 0;
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}
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struct network_destination *destination = create_unicast_destination(&addr, interface);
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if (destination){
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overlay_send_probe(subscriber, destination, OQ_MESH_MANAGEMENT);
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release_destination_ref(destination);
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}
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}
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}
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return 0;
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}
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