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)
}
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) consumeReceivedPubKey(c inet.Conn, kb []byte) {
lp := c.LocalPeer()
rp := c.RemotePeer()
if kb == nil {
log.Debugf("%s did not receive public key for remote peer: %s", lp, rp)
return
}
newKey, err := ic.UnmarshalPublicKey(kb)
if err != nil {
log.Errorf("%s cannot unmarshal key from remote peer: %s", lp, rp)
return
}
// verify key matches peer.ID
np, err := peer.IDFromPublicKey(newKey)
if err != nil {
log.Debugf("%s cannot get peer.ID from key of remote peer: %s, %s", lp, rp, err)
return
}
if np != rp {
// if the newKey's peer.ID does not match known peer.ID...
if rp == "" && np != "" {
// if local peerid is empty, then use the new, sent key.
err := ids.Host.Peerstore().AddPubKey(rp, newKey)
if err != nil {
log.Debugf("%s could not add key for %s to peerstore: %s", lp, rp, err)
}
} else {
// we have a local peer.ID and it does not match the sent key... error.
log.Errorf("%s received key for remote peer %s mismatch: %s", lp, rp, np)
}
return
}
currKey := ids.Host.Peerstore().PubKey(rp)
if currKey == nil {
// no key? no auth transport. set this one.
err := ids.Host.Peerstore().AddPubKey(rp, newKey)
if err != nil {
log.Debugf("%s could not add key for %s to peerstore: %s", lp, rp, err)
}
return
}
// ok, we have a local key, we should verify they match.
if currKey.Equals(newKey) {
return // ok great. we're done.
}
// weird, got a different key... but the different key MATCHES the peer.ID.
// this odd. let's log error and investigate. this should basically never happen
// and it means we have something funky going on and possibly a bug.
log.Errorf("%s identify got a different key for: %s", lp, rp)
// okay... does ours NOT match the remote peer.ID?
cp, err := peer.IDFromPublicKey(currKey)
if err != nil {
log.Errorf("%s cannot get peer.ID from local key of remote peer: %s, %s", lp, rp, err)
return
}
if cp != rp {
log.Errorf("%s local key for remote peer %s yields different peer.ID: %s", lp, rp, cp)
return
}
// okay... curr key DOES NOT match new key. both match peer.ID. wat?
log.Errorf("%s local key and received key for %s do not match, but match peer.ID", lp, rp)
}