add direct dialer and connector

connector/direct/connector.go

@@ -0,0 +1,55 @@
+package forward
+
+import (
+	"context"
+	"net"
+
+	"github.com/go-gost/core/connector"
+	md "github.com/go-gost/core/metadata"
+	"github.com/go-gost/x/registry"
+)
+
+func init() {
+	registry.ConnectorRegistry().Register("direct", NewConnector)
+}
+
+type directConnector struct {
+	options connector.Options
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := connector.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &directConnector{
+		options: options,
+	}
+}
+
+func (c *directConnector) Init(md md.Metadata) (err error) {
+	return nil
+}
+
+func (c *directConnector) Connect(ctx context.Context, _ net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	var cOpts connector.ConnectOptions
+	for _, opt := range opts {
+		opt(&cOpts)
+	}
+
+	conn, err := cOpts.NetDialer.Dial(ctx, network, address)
+	if err != nil {
+		return nil, err
+	}
+
+	log := c.options.Logger.WithFields(map[string]any{
+		"remote":  conn.RemoteAddr().String(),
+		"local":   conn.LocalAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	log.Debugf("connect %s/%s", address, network)
+
+	return conn, nil
+}