feature: MITM

adapter/inbound/mitm.go

@@ -0,0 +1,22 @@
+package inbound
+
+import (
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/context"
+	"github.com/Dreamacro/clash/transport/socks5"
+)
+
+// NewMitm receive mitm request and return MitmContext
+func NewMitm(target socks5.Addr, source net.Addr, userAgent string, conn net.Conn) *context.ConnContext {
+	metadata := parseSocksAddr(target)
+	metadata.NetWork = C.TCP
+	metadata.Type = C.MITM
+	metadata.UserAgent = userAgent
+	if ip, port, err := parseAddr(source); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
+	return context.NewConnContext(conn, metadata)
+}

adapter/outbound/http.go

@@ -113,6 +113,10 @@ func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
 		tempHeaders["Proxy-Authorization"] = "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
 	}
 
+	if metadata.Type == C.MITM {
+		tempHeaders["Origin-Request-Source-Address"] = metadata.SourceAddress()
+	}
+
 	for key, value := range tempHeaders {
 		HeaderString += key + ": " + value + "\r\n"
 	}

adapter/outbound/mitm.go

@@ -0,0 +1,50 @@
+package outbound
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/Dreamacro/clash/component/dialer"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Mitm struct {
+	*Base
+	serverAddr      *net.TCPAddr
+	httpProxyClient *Http
+}
+
+// DialContext implements C.ProxyAdapter
+func (m *Mitm) DialContext(ctx context.Context, metadata *C.Metadata, _ ...dialer.Option) (C.Conn, error) {
+	c, err := net.DialTCP("tcp", nil, m.serverAddr)
+	if err != nil {
+		return nil, err
+	}
+
+	_ = c.SetKeepAlive(true)
+	_ = c.SetKeepAlivePeriod(60 * time.Second)
+
+	metadata.Type = C.MITM
+
+	hc, err := m.httpProxyClient.StreamConnContext(ctx, c, metadata)
+	if err != nil {
+		_ = c.Close()
+		return nil, err
+	}
+
+	return NewConn(hc, m), nil
+}
+
+func NewMitm(serverAddr string) *Mitm {
+	tcpAddr, _ := net.ResolveTCPAddr("tcp", serverAddr)
+	http, _ := NewHttp(HttpOption{})
+	return &Mitm{
+		Base: &Base{
+			name: "Mitm",
+			tp:   C.Mitm,
+		},
+		serverAddr:      tcpAddr,
+		httpProxyClient: http,
+	}
+}