void IPNDAgent::componentRun() throw ()
{
struct timeval tv;
// every second we want to transmit a discovery message, timeout of 1 seconds
tv.tv_sec = 1;
tv.tv_usec = 0;
// get the reference to the discovery agent
dtn::net::DiscoveryAgent &agent = dtn::core::BundleCore::getInstance().getDiscoveryAgent();
try {
while (true)
{
ibrcommon::socketset fds;
try {
// select on all bound sockets
_socket.select(&fds, NULL, NULL, &tv);
// receive from all sockets
for (ibrcommon::socketset::const_iterator iter = fds.begin(); iter != fds.end(); ++iter)
{
ibrcommon::multicastsocket &sock = dynamic_cast<ibrcommon::multicastsocket&>(**iter);
char data[1500];
ibrcommon::vaddress sender;
DiscoveryBeacon beacon = agent.obtainBeacon();
ssize_t len = sock.recvfrom(data, 1500, 0, sender);
if (len < 0) return;
stringstream ss;
ss.write(data, len);
try {
ss >> beacon;
if (beacon.isShort())
{
// generate name with the sender address
beacon.setEID( dtn::data::EID("udp://[" + sender.address() + "]:4556") );
// add generated tcpcl service if the services list is empty
beacon.addService(dtn::net::DiscoveryService(dtn::core::Node::CONN_TCPIP, "ip=" + sender.address() + ";port=4556;"));
}
DiscoveryBeacon::service_list &services = beacon.getServices();
// add source address if not set
for (dtn::net::DiscoveryBeacon::service_list::iterator iter = services.begin(); iter != services.end(); ++iter) {
DiscoveryService &service = (*iter);
if ( (service.getParameters().find("port=") != std::string::npos) &&
(service.getParameters().find("ip=") == std::string::npos) ) {
// update service entry
service.update("ip=" + sender.address() + ";" + service.getParameters());
}
}
// announce the received beacon
agent.onBeaconReceived(beacon);
} catch (const dtn::InvalidDataException&) {
} catch (const ibrcommon::IOException&) {
}
}
// trigger an artificial timeout if the remaining timeout value is zero or below
if ( tv.tv_sec <= 0 && tv.tv_usec <= 0 )
throw ibrcommon::vsocket_timeout("timeout");
} catch (const ibrcommon::vsocket_timeout&) {
// reset timeout to 1 second
tv.tv_sec = 1;
tv.tv_usec = 0;
}
yield();
}
} catch (const ibrcommon::vsocket_interrupt&) {
// vsocket has been interrupted - exit now
} catch (const ibrcommon::socket_exception &ex) {
// unexpected error - exit now
IBRCOMMON_LOGGER_TAG(IPNDAgent::TAG, error) << "unexpected error: " << ex.what() << IBRCOMMON_LOGGER_ENDL;
}
}
