add ssh dialer

pkg/connector/forward/ssh/connector.go

@@ -0,0 +1,79 @@
+package ssh
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	"github.com/go-gost/gost/pkg/connector"
+	ssh_util "github.com/go-gost/gost/pkg/internal/util/ssh"
+	"github.com/go-gost/gost/pkg/logger"
+	md "github.com/go-gost/gost/pkg/metadata"
+	"github.com/go-gost/gost/pkg/registry"
+)
+
+func init() {
+	registry.RegiserConnector("sshd", NewConnector)
+}
+
+type forwardConnector struct {
+	logger logger.Logger
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := &connector.Options{}
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &forwardConnector{
+		logger: options.Logger,
+	}
+}
+
+func (c *forwardConnector) Init(md md.Metadata) (err error) {
+	return nil
+}
+
+func (c *forwardConnector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	c.logger = c.logger.WithFields(map[string]interface{}{
+		"remote":  conn.RemoteAddr().String(),
+		"local":   conn.LocalAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	c.logger.Infof("connect %s/%s", address, network)
+
+	cc, ok := conn.(*ssh_util.ClientConn)
+	if !ok {
+		return nil, errors.New("ssh: invalid connection")
+	}
+
+	conn, err := cc.Client().Dial(network, address)
+	if err != nil {
+		c.logger.Error(err)
+		return nil, err
+	}
+
+	return conn, nil
+}
+
+// Bind implements connector.Binder.
+func (c *forwardConnector) Bind(ctx context.Context, conn net.Conn, network, address string, opts ...connector.BindOption) (net.Listener, error) {
+	c.logger = c.logger.WithFields(map[string]interface{}{
+		"network": network,
+		"address": address,
+	})
+	c.logger.Infof("bind on %s/%s", address, network)
+
+	cc, ok := conn.(*ssh_util.ClientConn)
+	if !ok {
+		return nil, errors.New("ssh: invalid connection")
+	}
+
+	if host, port, _ := net.SplitHostPort(address); host == "" {
+		address = net.JoinHostPort("0.0.0.0", port)
+	}
+
+	return cc.Client().Listen(network, address)
+}