Xray-core/transport/internet/http/dialer.go

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package http
import (
"context"
gotls "crypto/tls"
"net/http"
"net/url"
"sync"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/net/cnc"
"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/tls"
"github.com/xtls/xray-core/transport/pipe"
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"golang.org/x/net/http2"
)
type dialerConf struct {
net.Destination
*internet.SocketConfig
}
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var (
globalDialerMap map[dialerConf]*http.Client
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globalDialerAccess sync.Mutex
)
func getHTTPClient(ctx context.Context, dest net.Destination, tlsSettings *tls.Config, sockopt *internet.SocketConfig) (*http.Client, error) {
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globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
if globalDialerMap == nil {
globalDialerMap = make(map[dialerConf]*http.Client)
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}
if client, found := globalDialerMap[dialerConf{dest, sockopt}]; found {
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return client, nil
}
transport := &http2.Transport{
DialTLS: func(network string, addr string, tlsConfig *gotls.Config) (net.Conn, error) {
rawHost, rawPort, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
if len(rawPort) == 0 {
rawPort = "443"
}
port, err := net.PortFromString(rawPort)
if err != nil {
return nil, err
}
address := net.ParseAddress(rawHost)
dctx := context.Background()
dctx = session.ContextWithID(dctx, session.IDFromContext(ctx))
dctx = session.ContextWithOutbound(dctx, session.OutboundFromContext(ctx))
pconn, err := internet.DialSystem(dctx, net.TCPDestination(address, port), sockopt)
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if err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
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return nil, err
}
cn := gotls.Client(pconn, tlsConfig)
if err := cn.Handshake(); err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
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return nil, err
}
if !tlsConfig.InsecureSkipVerify {
if err := cn.VerifyHostname(tlsConfig.ServerName); err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
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return nil, err
}
}
state := cn.ConnectionState()
if p := state.NegotiatedProtocol; p != http2.NextProtoTLS {
return nil, newError("http2: unexpected ALPN protocol " + p + "; want q" + http2.NextProtoTLS).AtError()
}
if !state.NegotiatedProtocolIsMutual {
return nil, newError("http2: could not negotiate protocol mutually").AtError()
}
return cn, nil
},
TLSClientConfig: tlsSettings.GetTLSConfig(tls.WithDestination(dest)),
}
client := &http.Client{
Transport: transport,
}
globalDialerMap[dialerConf{dest, sockopt}] = client
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return client, nil
}
// Dial dials a new TCP connection to the given destination.
func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
httpSettings := streamSettings.ProtocolSettings.(*Config)
tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
if tlsConfig == nil {
return nil, newError("TLS must be enabled for http transport.").AtWarning()
}
client, err := getHTTPClient(ctx, dest, tlsConfig, streamSettings.SocketSettings)
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if err != nil {
return nil, err
}
opts := pipe.OptionsFromContext(ctx)
preader, pwriter := pipe.New(opts...)
breader := &buf.BufferedReader{Reader: preader}
request := &http.Request{
Method: "PUT",
Host: httpSettings.getRandomHost(),
Body: breader,
URL: &url.URL{
Scheme: "https",
Host: dest.NetAddr(),
Path: httpSettings.getNormalizedPath(),
},
Proto: "HTTP/2",
ProtoMajor: 2,
ProtoMinor: 0,
Header: make(http.Header),
}
// Disable any compression method from server.
request.Header.Set("Accept-Encoding", "identity")
response, err := client.Do(request)
if err != nil {
return nil, newError("failed to dial to ", dest).Base(err).AtWarning()
}
if response.StatusCode != 200 {
return nil, newError("unexpected status", response.StatusCode).AtWarning()
}
bwriter := buf.NewBufferedWriter(pwriter)
common.Must(bwriter.SetBuffered(false))
return cnc.NewConnection(
cnc.ConnectionOutput(response.Body),
cnc.ConnectionInput(bwriter),
cnc.ConnectionOnClose(common.ChainedClosable{breader, bwriter, response.Body}),
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), nil
}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, Dial))
}