cloudflared-mirror/ingress/origin_connection.go

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package ingress
import (
"context"
"io"
"net"
"time"
"github.com/rs/zerolog"
"github.com/cloudflare/cloudflared/ipaccess"
"github.com/cloudflare/cloudflared/socks"
"github.com/cloudflare/cloudflared/stream"
"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) {
stream.Pipe(originConn, remoteConn, log)
}
// tcpConnection is an OriginConnection that directly streams to raw TCP.
type tcpConnection struct {
net.Conn
writeTimeout time.Duration
logger *zerolog.Logger
}
func (tc *tcpConnection) Stream(_ context.Context, tunnelConn io.ReadWriter, _ *zerolog.Logger) {
stream.Pipe(tunnelConn, tc, tc.logger)
}
func (tc *tcpConnection) Write(b []byte) (int, error) {
if tc.writeTimeout > 0 {
if err := tc.Conn.SetWriteDeadline(time.Now().Add(tc.writeTimeout)); err != nil {
tc.logger.Err(err).Msg("Error setting write deadline for TCP connection")
}
}
nBytes, err := tc.Conn.Write(b)
if err != nil {
tc.logger.Err(err).Msg("Error writing to the TCP connection")
}
return nBytes, err
}
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) {
wsCtx, cancel := context.WithCancel(ctx)
wsConn := websocket.NewConn(wsCtx, tunnelConn, log)
wc.streamHandler(wsConn, wc.conn, log)
cancel()
// Makes sure wsConn stops sending ping before terminating the stream
wsConn.Close()
}
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) {
wsCtx, cancel := context.WithCancel(ctx)
wsConn := websocket.NewConn(wsCtx, tunnelConn, log)
socks.StreamNetHandler(wsConn, sp.accessPolicy, log)
cancel()
// Makes sure wsConn stops sending ping before terminating the stream
wsConn.Close()
}
func (sp *socksProxyOverWSConnection) Close() {
}