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| author | Adam Ierymenko <adam.ierymenko@gmail.com> | 2015-09-22 15:58:00 -0700 |
|---|---|---|
| committer | Adam Ierymenko <adam.ierymenko@gmail.com> | 2015-09-22 15:58:00 -0700 |
| commit | d656e87395441b995d376c9174f3f0570cbf4396 (patch) | |
| tree | dafcbb64127b90233f94107ede0d8ed53f4f69d5 /node/Peer.cpp | |
| parent | ddf3d1f94932738d058aa57ce2fa11f3c9bde089 (diff) | |
| download | infinitytier-d656e87395441b995d376c9174f3f0570cbf4396.tar.gz infinitytier-d656e87395441b995d376c9174f3f0570cbf4396.zip | |
Send a random small payload for NAT keepalives, since zero byte packets seem to fail to keep associations alive behind some NATs.
Diffstat (limited to 'node/Peer.cpp')
| -rw-r--r-- | node/Peer.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/node/Peer.cpp b/node/Peer.cpp index c27afa8f..85874105 100644 --- a/node/Peer.cpp +++ b/node/Peer.cpp @@ -39,6 +39,9 @@ namespace ZeroTier { +// Used to send varying values for NAT keepalive +static uint32_t _natKeepaliveBuf = 0; + Peer::Peer(const Identity &myIdentity,const Identity &peerIdentity) throw(std::runtime_error) : _lastUsed(0), @@ -217,8 +220,9 @@ void Peer::doPingAndKeepalive(const RuntimeEnvironment *RR,uint64_t now) attemptToContactAt(RR,bestPath->address(),now); bestPath->sent(now); } else if (((now - bestPath->lastSend()) >= ZT_NAT_KEEPALIVE_DELAY)&&(!bestPath->reliable())) { + _natKeepaliveBuf += (uint32_t)now * 2654435761; // tumble this around to send constantly varying (meaningless) payloads TRACE("NAT keepalive %s(%s)",_id.address().toString().c_str(),bestPath->address().toString().c_str()); - RR->node->putPacket(bestPath->address(),"",0); + RR->node->putPacket(bestPath->address(),&_natKeepaliveBuf,sizeof(_natKeepaliveBuf)); bestPath->sent(now); } } |