119 lines
3.0 KiB
Go
119 lines
3.0 KiB
Go
package v2rayhttpupgrade
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import (
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std_bufio "bufio"
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"context"
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"net"
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"net/http"
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"net/url"
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"strings"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/tls"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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sHTTP "github.com/sagernet/sing/protocol/http"
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)
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var _ adapter.V2RayClientTransport = (*Client)(nil)
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type Client struct {
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dialer N.Dialer
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tlsConfig tls.Config
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serverAddr M.Socksaddr
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requestURL url.URL
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headers http.Header
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host string
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}
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func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayHTTPUpgradeOptions, tlsConfig tls.Config) (*Client, error) {
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if tlsConfig != nil {
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if len(tlsConfig.NextProtos()) == 0 {
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tlsConfig.SetNextProtos([]string{"http/1.1"})
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}
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}
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var host string
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if options.Host != "" {
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host = options.Host
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} else if tlsConfig != nil && tlsConfig.ServerName() != "" {
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host = tlsConfig.ServerName()
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} else {
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host = serverAddr.String()
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}
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var requestURL url.URL
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if tlsConfig == nil {
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requestURL.Scheme = "http"
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} else {
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requestURL.Scheme = "https"
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}
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requestURL.Host = serverAddr.String()
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requestURL.Path = options.Path
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err := sHTTP.URLSetPath(&requestURL, options.Path)
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if err != nil {
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return nil, E.Cause(err, "parse path")
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}
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if !strings.HasPrefix(requestURL.Path, "/") {
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requestURL.Path = "/" + requestURL.Path
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}
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headers := make(http.Header)
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for key, value := range options.Headers {
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headers[key] = value
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}
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return &Client{
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dialer: dialer,
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tlsConfig: tlsConfig,
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serverAddr: serverAddr,
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requestURL: requestURL,
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headers: headers,
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host: host,
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}, nil
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}
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func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
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conn, err := c.dialer.DialContext(ctx, N.NetworkTCP, c.serverAddr)
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if err != nil {
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return nil, err
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}
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if c.tlsConfig != nil {
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conn, err = tls.ClientHandshake(ctx, conn, c.tlsConfig)
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if err != nil {
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return nil, err
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}
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}
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request := &http.Request{
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Method: http.MethodGet,
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URL: &c.requestURL,
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Header: c.headers.Clone(),
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Host: c.host,
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}
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request.Header.Set("Connection", "Upgrade")
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request.Header.Set("Upgrade", "websocket")
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err = request.Write(conn)
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if err != nil {
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return nil, err
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}
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bufReader := std_bufio.NewReader(conn)
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response, err := http.ReadResponse(bufReader, request)
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if err != nil {
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return nil, err
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}
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if response.StatusCode != 101 ||
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!strings.EqualFold(response.Header.Get("Connection"), "upgrade") ||
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!strings.EqualFold(response.Header.Get("Upgrade"), "websocket") {
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return nil, E.New("unexpected status: ", response.Status)
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}
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if bufReader.Buffered() > 0 {
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buffer := buf.NewSize(bufReader.Buffered())
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_, err = buffer.ReadFullFrom(bufReader, buffer.Len())
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if err != nil {
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return nil, err
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}
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conn = bufio.NewCachedConn(conn, buffer)
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}
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return conn, nil
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}
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