by setting StatusTCPOnly == 1, when a new version client connect to an
old version server, the client will treat the server as udp disabled and
will not submit a udp request or open a udp control stream.
this make the upgrade much more smoothly even if we don't change the
protocolVersion.
this commit makes changes on the hysteria protocol, although old clients
still be able to connect to a newer server, newer clients will fail if
they connect to older servers and trying to submit a udp request, so the
protocolVersion should be bumped if this commit finally get merged.
this commit changes the way to handle hyClient.DialUDP(). in the past,
the hysteria client asks the server to create the sessionID in every
call to hyClient.DialUDP(), which requires a extra RTT to wait the
server reply. to avoid this extra RTT, the hysteria client just
generates and manages the sessionID by theirselves. the server checks
the sessionID sent from clients in every udpMessage, and open & initiate
a new udp session for every sessionID it not recognized.
the way to release udp sessions is also changed in this commit, as every
udp session no longer maintains a quic stream, now the client will open
a dedicated quic stream to notify the server to release specified udp
session. this also changes the behavior of "max_conn_client" in the
server config.
this commit can be a partial fix for #348, #352 and #414.
- UDP support has been temporarily removed, pending upstream QUIC library support for unreliable messages
- SOCKS5 server needs some rework
- Authentication
