func (ids *IDService) consumeObservedAddress(observed []byte, c inet.Conn) {
if observed == nil {
return
}
maddr, err := ma.NewMultiaddrBytes(observed)
if err != nil {
log.Debugf("error parsing received observed addr for %s: %s", c, err)
return
}
// we should only use ObservedAddr when our connection's LocalAddr is one
// of our ListenAddrs. If we Dial out using an ephemeral addr, knowing that
// address's external mapping is not very useful because the port will not be
// the same as the listen addr.
ifaceaddrs, err := ids.Host.Network().InterfaceListenAddresses()
if err != nil {
log.Infof("failed to get interface listen addrs", err)
return
}
log.Debugf("identify identifying observed multiaddr: %s %s", c.LocalMultiaddr(), ifaceaddrs)
if !addrInAddrs(c.LocalMultiaddr(), ifaceaddrs) {
// not in our list
return
}
// ok! we have the observed version of one of our ListenAddresses!
log.Debugf("added own observed listen addr: %s --> %s", c.LocalMultiaddr(), maddr)
ids.observedAddrs.Add(maddr, c.RemoteMultiaddr())
}
func logProtocolMismatchDisconnect(c inet.Conn, protocol, agent string) {
lm := make(lgbl.DeferredMap)
lm["remotePeer"] = func() interface{} { return c.RemotePeer().Pretty() }
lm["remoteAddr"] = func() interface{} { return c.RemoteMultiaddr().String() }
lm["protocolVersion"] = protocol
lm["agentVersion"] = agent
log.Event(context.TODO(), "IdentifyProtocolMismatch", lm)
log.Debugf("IdentifyProtocolMismatch %s %s %s (disconnected)", c.RemotePeer(), protocol, agent)
}
func (ids *IDService) populateMessage(mes *pb.Identify, c inet.Conn) {
// set protocols this node is currently handling
protos := ids.Host.Mux().Protocols()
mes.Protocols = make([]string, len(protos))
for i, p := range protos {
mes.Protocols[i] = string(p)
}
// observed address so other side is informed of their
// "public" address, at least in relation to us.
mes.ObservedAddr = c.RemoteMultiaddr().Bytes()
// set listen addrs, get our latest addrs from Host.
laddrs := ids.Host.Addrs()
mes.ListenAddrs = make([][]byte, len(laddrs))
for i, addr := range laddrs {
mes.ListenAddrs[i] = addr.Bytes()
}
log.Debugf("%s sent listen addrs to %s: %s", c.LocalPeer(), c.RemotePeer(), laddrs)
// set our public key
ownKey := ids.Host.Peerstore().PubKey(ids.Host.ID())
if ownKey == nil {
log.Errorf("did not have own public key in Peerstore")
} else {
if kb, err := ownKey.Bytes(); err != nil {
log.Errorf("failed to convert key to bytes")
} else {
mes.PublicKey = kb
}
}
// set protocol versions
pv := LibP2PVersion
av := ClientVersion
mes.ProtocolVersion = &pv
mes.AgentVersion = &av
}
func (ids *IDService) consumeMessage(mes *pb.Identify, c inet.Conn) {
p := c.RemotePeer()
// mes.Protocols
ids.Host.Peerstore().SetProtocols(p, mes.Protocols...)
// mes.ObservedAddr
ids.consumeObservedAddress(mes.GetObservedAddr(), c)
// mes.ListenAddrs
laddrs := mes.GetListenAddrs()
lmaddrs := make([]ma.Multiaddr, 0, len(laddrs))
for _, addr := range laddrs {
maddr, err := ma.NewMultiaddrBytes(addr)
if err != nil {
log.Debugf("%s failed to parse multiaddr from %s %s", ID,
p, c.RemoteMultiaddr())
continue
}
lmaddrs = append(lmaddrs, maddr)
}
// if the address reported by the connection roughly matches their annoucned
// listener addresses, its likely to be an external NAT address
if HasConsistentTransport(c.RemoteMultiaddr(), lmaddrs) {
lmaddrs = append(lmaddrs, c.RemoteMultiaddr())
}
// update our peerstore with the addresses. here, we SET the addresses, clearing old ones.
// We are receiving from the peer itself. this is current address ground truth.
ids.Host.Peerstore().SetAddrs(p, lmaddrs, pstore.ConnectedAddrTTL)
log.Debugf("%s received listen addrs for %s: %s", c.LocalPeer(), c.RemotePeer(), lmaddrs)
// get protocol versions
pv := mes.GetProtocolVersion()
av := mes.GetAgentVersion()
// version check. if we shouldn't talk, bail.
// TODO: at this point, we've already exchanged information.
// move this into a first handshake before the connection can open streams.
if !protocolVersionsAreCompatible(pv, LibP2PVersion) {
logProtocolMismatchDisconnect(c, pv, av)
c.Close()
return
}
ids.Host.Peerstore().Put(p, "ProtocolVersion", pv)
ids.Host.Peerstore().Put(p, "AgentVersion", av)
// get the key from the other side. we may not have it (no-auth transport)
ids.consumeReceivedPubKey(c, mes.PublicKey)
}