protocol

const (
	// ChannelHTTP is a custom channel type for forwarding HTTP requests.
	// The server opens this channel toward the client for each incoming request.
	ChannelHTTP = "gatecrash-http"

	// ChannelDirectTCPIP is the standard SSH direct-tcpip channel (RFC 4254 Section 7.2).
	// Used for raw TCP port forwarding.
	ChannelDirectTCPIP = "direct-tcpip"

	// ChannelControl is a long-lived channel for heartbeat and metadata exchange.
	// Opened by the client immediately after SSH connection.
	ChannelControl = "gatecrash-control"

	// ChannelDiagnostic is opened by the server toward the client to run
	// latency and throughput diagnostics on the tunnel link itself.
	ChannelDiagnostic = "gatecrash-diagnostic"
)

const (
	ControlHeartbeat       = "heartbeat"
	ControlClientInfo      = "client_info"
	ControlUpdateAvailable = "update_available"
)

const (
	DiagPing     = "ping"
	DiagPong     = "pong"
	DiagDownload = "download" // server tells client to read N bytes of payload
	DiagUpload   = "upload"   // server tells client to send N bytes of payload
	DiagResult   = "result"   // client confirms completion
)