feat(forwarder): split forwarder to different file

core/dial.go

@@ -0,0 +1,27 @@
+package core
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"tailscale.com/tsnet"
+)
+
+const dialTimeout = 10 * time.Second
+
+func dialTCP(ctx context.Context, addr string) (net.Conn, error) {
+	dialer := net.Dialer{Timeout: dialTimeout}
+	return dialer.DialContext(ctx, "tcp", addr)
+}
+
+func dialUDP(ctx context.Context, addr string) (net.Conn, error) {
+	dialer := net.Dialer{Timeout: dialTimeout}
+	return dialer.DialContext(ctx, "udp", addr)
+}
+
+func dialTsnet(ctx context.Context, srv *tsnet.Server, network, addr string) (net.Conn, error) {
+	dialCtx, cancel := context.WithTimeout(ctx, dialTimeout)
+	defer cancel()
+	return srv.Dial(dialCtx, network, addr)
+}