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55 lines
1.9 KiB
C
55 lines
1.9 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 "fdqueue.h"
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/* Collection of unicast echo responses to detect working links */
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DEFINE_BINDING(MDP_PORT_PROBE, overlay_mdp_service_probe);
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static int overlay_mdp_service_probe(struct internal_mdp_header *header, struct overlay_buffer *payload)
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{
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IN();
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if (header->source_port!=MDP_PORT_ECHO){
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WARN("Probe packets should be returned from remote echo port");
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RETURN(-1);
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}
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DEBUGF(overlayrouting, "Received probe response from %s", alloca_tohex_sid_t(header->source->sid));
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if (header->source->reachable == REACHABLE_SELF)
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RETURN(0);
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uint8_t interface = ob_get(payload);
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struct socket_address addr;
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addr.addrlen = ob_remaining(payload);
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if ((size_t)addr.addrlen > sizeof(addr.store))
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RETURN(WHY("Badly formatted probe packet"));
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ob_get_bytes(payload, (unsigned char*)&addr.addr, addr.addrlen);
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RETURN(link_unicast_ack(header->source, &overlay_interfaces[interface], &addr));
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OUT();
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}
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