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Send HELLO instead of NOP for NAT-t in order to measure latency always. Also prevents a race that can cause the first NAT-t to fail where the NOP arrives before the WHOIS reply from the supernode. Now NAT-t initiators will push their own public keys anyway so that doesnt matter.

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This commit is contained in:
Adam Ierymenko 2013-07-06 16:20:35 -04:00
parent 2eaac3891e
commit ef08494237
2 changed files with 25 additions and 5 deletions
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20
node/Switch.cpp
View File

@ -314,6 +314,19 @@ void Switch::sendHELLO(const Address &dest)
send(outp,false);
}
bool Switch::sendHELLO(const SharedPtr<Peer> &dest,Demarc::Port localPort,const InetAddress &addr)
{
Packet outp(dest->address(),_r->identity.address(),Packet::VERB_HELLO);
outp.append((unsigned char)ZT_PROTO_VERSION);
outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR);
outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR);
outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION);
outp.append(Utils::now());
_r->identity.serialize(outp,false);
outp.hmacSet(dest->macKey());
return _r->demarc->send(localPort,addr,outp.data(),outp.size(),-1);
}
bool Switch::unite(const Address &p1,const Address &p2,bool force)
{
SharedPtr<Peer> p1p = _r->topology->getPeer(p1);
@ -394,11 +407,8 @@ unsigned long Switch::doTimerTasks()
if (now >= i->second.fireAtTime) {
SharedPtr<Peer> withPeer = _r->topology->getPeer(i->first);
if (withPeer) {
TRACE("sending NAT-T NOP to %s(%s)",i->first.toString().c_str(),i->second.inaddr.toString().c_str());
Packet outp(i->first,_r->identity.address(),Packet::VERB_NOP);
outp.append("ZT",2); // arbitrary payload
outp.hmacSet(withPeer->macKey());
_r->demarc->send(i->second.localPort,i->second.inaddr,outp.data(),outp.size(),-1);
TRACE("sending NAT-T HELLO to %s(%s)",i->first.toString().c_str(),i->second.inaddr.toString().c_str());
sendHELLO(withPeer,i->second.localPort,i->second.inaddr);
}
_rendezvousQueue.erase(i++);
} else {

10
node/Switch.hpp
View File

@ -106,6 +106,16 @@ public:
*/
void sendHELLO(const Address &dest);
/**
* Send a HELLO announcement immediately to the indicated address
*
* @param localPort Originating local port or ANY_PORT to pick
* @param addr IP address to send to
* @param dest Destination peer
* @return True if send appears successful
*/
bool sendHELLO(const SharedPtr<Peer> &dest,Demarc::Port localPort,const InetAddress &addr);
/**
* Send RENDEZVOUS to two peers to permit them to directly connect
*