cloudflared-mirror/ingress/origin_connection.go

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package ingress
import (
"context"
"io"
"net"
"github.com/rs/zerolog"
"github.com/cloudflare/cloudflared/ipaccess"
"github.com/cloudflare/cloudflared/socks"
"github.com/cloudflare/cloudflared/websocket"
)
// OriginConnection is a way to stream to a service running on the user's origin.
// Different concrete implementations will stream different protocols as long as they are io.ReadWriters.
type OriginConnection interface {
// Stream should generally be implemented as a bidirectional io.Copy.
Stream(ctx context.Context, tunnelConn io.ReadWriter, log *zerolog.Logger)
Close()
}
type streamHandlerFunc func(originConn io.ReadWriter, remoteConn net.Conn, log *zerolog.Logger)
// DefaultStreamHandler is an implementation of streamHandlerFunc that
// performs a two way io.Copy between originConn and remoteConn.
func DefaultStreamHandler(originConn io.ReadWriter, remoteConn net.Conn, log *zerolog.Logger) {
websocket.Stream(originConn, remoteConn, log)
}
// tcpConnection is an OriginConnection that directly streams to raw TCP.
type tcpConnection struct {
conn net.Conn
}
func (tc *tcpConnection) Stream(ctx context.Context, tunnelConn io.ReadWriter, log *zerolog.Logger) {
websocket.Stream(tunnelConn, tc.conn, log)
}
func (tc *tcpConnection) Close() {
tc.conn.Close()
}
// tcpOverWSConnection is an OriginConnection that streams to TCP over WS.
type tcpOverWSConnection struct {
conn net.Conn
streamHandler streamHandlerFunc
}
func (wc *tcpOverWSConnection) Stream(ctx context.Context, tunnelConn io.ReadWriter, log *zerolog.Logger) {
wc.streamHandler(websocket.NewConn(ctx, tunnelConn, log), wc.conn, log)
}
func (wc *tcpOverWSConnection) Close() {
wc.conn.Close()
}
// socksProxyOverWSConnection is an OriginConnection that streams SOCKS connections over WS.
// The connection to the origin happens inside the SOCKS code as the client specifies the origin
// details in the packet.
type socksProxyOverWSConnection struct {
accessPolicy *ipaccess.Policy
}
func (sp *socksProxyOverWSConnection) Stream(ctx context.Context, tunnelConn io.ReadWriter, log *zerolog.Logger) {
socks.StreamNetHandler(websocket.NewConn(ctx, tunnelConn, log), sp.accessPolicy, log)
}
func (sp *socksProxyOverWSConnection) Close() {
}
// wsProxyConnection represents a bidirectional stream for a websocket connection to the origin
type wsProxyConnection struct {
rwc io.ReadWriteCloser
}
func (conn *wsProxyConnection) Stream(ctx context.Context, tunnelConn io.ReadWriter, log *zerolog.Logger) {
websocket.Stream(tunnelConn, conn.rwc, log)
}
func (conn *wsProxyConnection) Close() {
conn.rwc.Close()
}