Add new TCPBufferSize parameter to network

network/socks5.go

@@ -2,16 +2,34 @@ package network
 
 import (
 	"fmt"
+	"net"
 	"net/url"
 
 	"golang.org/x/net/proxy"
 )
 
+type socks5Dialer struct {
+	proxy.ContextDialer
+
+	bufferSize int
+}
+
+func (s socks5Dialer) Dial(protocol, address string) (net.Conn, error) {
+	return s.ContextDialer.(proxy.Dialer).Dial(protocol, address)
+}
+
+func (s socks5Dialer) TCPBufferSize() int {
+	return s.bufferSize
+}
+
 func NewSocks5Dialer(baseDialer Dialer, proxyURL *url.URL) (Dialer, error) {
 	rv, err := proxy.FromURL(proxyURL, baseDialer)
 	if err != nil {
 		return nil, fmt.Errorf("cannot initialize socks5 proxy dialer: %w", err)
 	}
 
-	return rv.(Dialer), nil
+	return socks5Dialer{
+		ContextDialer: rv.(proxy.ContextDialer),
+		bufferSize:    baseDialer.TCPBufferSize(),
+	}, nil
 }