NGC handshake protocol

Tox NGC handshake protocol.txt

1. Peer A receives Peer B's announcement from DHT:

A -> B send handshake request GH_REQUEST & HS_INVITE_REQUEST
B -> A send handshake response GH_RESPONSE & HS_INVITE_REQUEST
A -> B send invite request GP_INVITE_REQUEST
B -> A send invite response GP_INVITE_RESPONSE
A -> B send sync request GP_SYNC_REQUEST
B -> A send sync response GP_SYNC_RESPONSE
  B -> A send all other peer announcements [goto: 2]
A -> Connection State = CS_CONNECTED
  A -> C send GH_REQUEST & HS_PEER_INFO_EXCHANGE to all received announcements
  A -> B [goto: peer info exchange]


2. Peer A sends Peer C a handshake request via sync response from peer B

A -> C send handshake request GH_REQUEST & HS_PEER_INFO_EXCHANGE
C -> A send handshake response GH_RESPONSE & HS_PEER_INFO_EXCHANGE
A -> C [goto: peer info exchange]


Peer info exchange:
A -> B send peer info request GP_PEER_INFO_REQUEST
  A -> B send self info response GP_PEER_INFO_RESPONSE
B -> peer A confirmed
  B -> A send self info response GP_PEER_INFO_RESPONSE
A -> peer B confirmed