add pkgs from core

connector/http/connector.go

@@ -0,0 +1,129 @@
+package http
+
+import (
+	"bufio"
+	"context"
+	"encoding/base64"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"time"
+
+	"github.com/go-gost/core/connector"
+	"github.com/go-gost/core/logger"
+	md "github.com/go-gost/core/metadata"
+	"github.com/go-gost/x/internal/util/socks"
+	"github.com/go-gost/x/registry"
+)
+
+func init() {
+	registry.ConnectorRegistry().Register("http", NewConnector)
+}
+
+type httpConnector struct {
+	md      metadata
+	options connector.Options
+}
+
+func NewConnector(opts ...connector.Option) connector.Connector {
+	options := connector.Options{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &httpConnector{
+		options: options,
+	}
+}
+
+func (c *httpConnector) Init(md md.Metadata) (err error) {
+	return c.parseMetadata(md)
+}
+
+func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
+	log := c.options.Logger.WithFields(map[string]any{
+		"local":   conn.LocalAddr().String(),
+		"remote":  conn.RemoteAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	log.Infof("connect %s/%s", address, network)
+
+	req := &http.Request{
+		Method:     http.MethodConnect,
+		URL:        &url.URL{Host: address},
+		Host:       address,
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     c.md.header,
+	}
+
+	if req.Header == nil {
+		req.Header = http.Header{}
+	}
+	req.Header.Set("Proxy-Connection", "keep-alive")
+
+	if user := c.options.Auth; user != nil {
+		u := user.Username()
+		p, _ := user.Password()
+		req.Header.Set("Proxy-Authorization",
+			"Basic "+base64.StdEncoding.EncodeToString([]byte(u+":"+p)))
+	}
+
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		if _, ok := conn.(net.PacketConn); ok {
+			err := fmt.Errorf("tcp over udp is unsupported")
+			log.Error(err)
+			return nil, err
+		}
+	case "udp", "udp4", "udp6":
+		req.Header.Set("X-Gost-Protocol", "udp")
+	default:
+		err := fmt.Errorf("network %s is unsupported", network)
+		log.Error(err)
+		return nil, err
+	}
+
+	if log.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpRequest(req, false)
+		log.Debug(string(dump))
+	}
+
+	if c.md.connectTimeout > 0 {
+		conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
+		defer conn.SetDeadline(time.Time{})
+	}
+
+	req = req.WithContext(ctx)
+	if err := req.Write(conn); err != nil {
+		return nil, err
+	}
+
+	resp, err := http.ReadResponse(bufio.NewReader(conn), req)
+	if err != nil {
+		return nil, err
+	}
+	// NOTE: the server may return `Transfer-Encoding: chunked` header,
+	// then the Content-Length of response will be unknown (-1),
+	// in this case, close body will be blocked, so we leave it untouched.
+	// defer resp.Body.Close()
+
+	if log.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		log.Debug(string(dump))
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%s", resp.Status)
+	}
+
+	if network == "udp" {
+		addr, _ := net.ResolveUDPAddr(network, address)
+		return socks.UDPTunClientConn(conn, addr), nil
+	}
+
+	return conn, nil
+}