Add --bind flag for choosing the local addr on outgoing connections - fixes #1087

Supported by all remotes except FTP.

fs/http_new.go

@@ -12,23 +12,18 @@ import (
 )
 
 // dial with context and timeouts
-func dialContextTimeout(ctx context.Context, network, address string, connectTimeout, timeout time.Duration) (net.Conn, error) {
-	dialer := net.Dialer{
-		Timeout:   connectTimeout,
-		KeepAlive: 30 * time.Second,
-	}
+func (ci *ConfigInfo) dialContextTimeout(ctx context.Context, network, address string) (net.Conn, error) {
+	dialer := ci.NewDialer()
 	c, err := dialer.DialContext(ctx, network, address)
 	if err != nil {
 		return c, err
 	}
-	return newTimeoutConn(c, timeout), nil
+	return newTimeoutConn(c, ci.Timeout), nil
 }
 
 // Initialise the http.Transport for go1.7+
 func (ci *ConfigInfo) initTransport(t *http.Transport) {
-	t.DialContext = func(ctx context.Context, network, address string) (net.Conn, error) {
-		return dialContextTimeout(ctx, network, address, ci.ConnectTimeout, ci.Timeout)
-	}
+	t.DialContext = ci.dialContextTimeout
 	t.IdleConnTimeout = 60 * time.Second
 	t.ExpectContinueTimeout = ci.ConnectTimeout
 }