Extract two shared helpers to eliminate duplicated code across STCP,
SUDP, and XTCP visitors:
- dialRawVisitorConn: handles ConnectServer + NewVisitorConn handshake
(auth, sign key, 10s read deadline, error check)
- wrapVisitorConn: handles encryption + pooled compression wrapping,
returning a recycleFn for pool resource cleanup
SUDP is upgraded from WithCompression to WithCompressionFromPool,
aligning with the pooled compression used by STCP and XTCP.
- Replace duplicate parseBasicAuth with existing httppkg.ParseBasicAuth
- Extract buildDomains helper in BaseProxy for HTTP/HTTPS/TCPMux proxies
- Extract toProxyStats helper to deduplicate ProxyStats construction
- Extract startVisitorListener helper in BaseProxy for STCP/SUDP proxies
- Extract acceptLoop helper in BaseVisitor for STCP/XTCP visitors
Fix connection leaks in multiple error paths across client and server:
- server/proxy/http: close tmpConn when WithEncryption fails
- client/proxy: close localConn when ProxyProtocol WriteTo fails
- client/visitor/sudp: close visitorConn on all error paths in getNewVisitorConn
- client/visitor/xtcp: close tunnelConn when WithEncryption fails
- client/visitor/xtcp: close lConn when NewKCPConnFromUDP fails
- pkg/plugin/client/unix_domain_socket: close localConn and connInfo.Conn when WriteTo fails, close connInfo.Conn when DialUnix fails
- pkg/plugin/client/tls2raw: close tlsConn when Handshake or Dial fails
- Update go.mod to use github.com/quic-go/quic-go v0.53.0
- Replace quic.Connection interface with *quic.Conn struct
- Replace quic.Stream interface with *quic.Stream struct
- Update all affected files to use new API:
- pkg/util/net/conn.go: Update QuicStreamToNetConn function and wrapQuicStream struct
- server/service.go: Update HandleQUICListener function parameter
- client/visitor/xtcp.go: Update QUICTunnelSession struct field
- client/connector.go: Update defaultConnectorImpl struct field
Fixes#4852
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
