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

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package splithttp
import (
"context"
gotls "crypto/tls"
"io"
"net/http"
"net/url"
"strconv"
"sync"
"time"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/signal/semaphore"
"github.com/xtls/xray-core/common/uuid"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/browser_dialer"
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"github.com/xtls/xray-core/transport/internet/stat"
"github.com/xtls/xray-core/transport/internet/tls"
"github.com/xtls/xray-core/transport/pipe"
"golang.org/x/net/http2"
)
type dialerConf struct {
net.Destination
*internet.MemoryStreamConfig
}
var (
globalDialerMap map[dialerConf]DialerClient
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globalDialerAccess sync.Mutex
)
func getHTTPClient(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) DialerClient {
if browser_dialer.HasBrowserDialer() {
return &BrowserDialerClient{}
}
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globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
if globalDialerMap == nil {
globalDialerMap = make(map[dialerConf]DialerClient)
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}
if client, found := globalDialerMap[dialerConf{dest, streamSettings}]; found {
return client
}
if browser_dialer.HasBrowserDialer() {
return &BrowserDialerClient{}
}
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tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
isH2 := tlsConfig != nil && !(len(tlsConfig.NextProtocol) == 1 && tlsConfig.NextProtocol[0] == "http/1.1")
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var gotlsConfig *gotls.Config
if tlsConfig != nil {
gotlsConfig = tlsConfig.GetTLSConfig(tls.WithDestination(dest))
}
dialContext := func(ctxInner context.Context) (net.Conn, error) {
conn, err := internet.DialSystem(ctxInner, dest, streamSettings.SocketSettings)
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if err != nil {
return nil, err
}
if gotlsConfig != nil {
if fingerprint := tls.GetFingerprint(tlsConfig.Fingerprint); fingerprint != nil {
conn = tls.UClient(conn, gotlsConfig, fingerprint)
if err := conn.(*tls.UConn).HandshakeContext(ctxInner); err != nil {
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return nil, err
}
} else {
conn = tls.Client(conn, gotlsConfig)
}
}
return conn, nil
}
var uploadTransport http.RoundTripper
var downloadTransport http.RoundTripper
if isH2 {
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downloadTransport = &http2.Transport{
DialTLSContext: func(ctxInner context.Context, network string, addr string, cfg *gotls.Config) (net.Conn, error) {
return dialContext(ctxInner)
},
IdleConnTimeout: 90 * time.Second,
}
uploadTransport = downloadTransport
} else {
httpDialContext := func(ctxInner context.Context, network string, addr string) (net.Conn, error) {
return dialContext(ctxInner)
}
downloadTransport = &http.Transport{
DialTLSContext: httpDialContext,
DialContext: httpDialContext,
IdleConnTimeout: 90 * time.Second,
// chunked transfer download with keepalives is buggy with
// http.Client and our custom dial context.
DisableKeepAlives: true,
}
// we use uploadRawPool for that
uploadTransport = nil
}
client := &DefaultDialerClient{
transportConfig: streamSettings.ProtocolSettings.(*Config),
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download: &http.Client{
Transport: downloadTransport,
},
upload: &http.Client{
Transport: uploadTransport,
},
isH2: isH2,
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uploadRawPool: &sync.Pool{},
dialUploadConn: dialContext,
}
globalDialerMap[dialerConf{dest, streamSettings}] = client
return client
}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, Dial))
}
func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
errors.LogInfo(ctx, "dialing splithttp to ", dest)
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var requestURL url.URL
transportConfiguration := streamSettings.ProtocolSettings.(*Config)
tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
maxConcurrentUploads := transportConfiguration.GetNormalizedMaxConcurrentUploads()
maxUploadSize := transportConfiguration.GetNormalizedMaxUploadSize()
if tlsConfig != nil {
requestURL.Scheme = "https"
} else {
requestURL.Scheme = "http"
}
requestURL.Host = transportConfiguration.Host
if requestURL.Host == "" {
requestURL.Host = dest.NetAddr()
}
requestURL.Path = transportConfiguration.GetNormalizedPath()
httpClient := getHTTPClient(ctx, dest, streamSettings)
sessionIdUuid := uuid.New()
sessionId := sessionIdUuid.String()
baseURL := requestURL.String() + sessionId
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uploadPipeReader, uploadPipeWriter := pipe.New(pipe.WithSizeLimit(maxUploadSize))
go func() {
requestsLimiter := semaphore.New(int(maxConcurrentUploads))
var requestCounter int64
// by offloading the uploads into a buffered pipe, multiple conn.Write
// calls get automatically batched together into larger POST requests.
// without batching, bandwidth is extremely limited.
for {
chunk, err := uploadPipeReader.ReadMultiBuffer()
if err != nil {
break
}
<-requestsLimiter.Wait()
seq := requestCounter
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requestCounter += 1
go func() {
defer requestsLimiter.Signal()
err := httpClient.SendUploadRequest(
context.WithoutCancel(ctx),
baseURL+"/"+strconv.FormatInt(seq, 10),
&buf.MultiBufferContainer{MultiBuffer: chunk},
int64(chunk.Len()),
)
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if err != nil {
errors.LogInfoInner(ctx, err, "failed to send upload")
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uploadPipeReader.Interrupt()
}
}()
}
}()
lazyRawDownload, remoteAddr, localAddr, err := httpClient.OpenDownload(context.WithoutCancel(ctx), baseURL)
if err != nil {
return nil, err
}
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lazyDownload := &LazyReader{
CreateReader: func() (io.ReadCloser, error) {
// skip "ooooooooook" response
trashHeader := []byte{0}
for {
_, err := io.ReadFull(lazyRawDownload, trashHeader)
if err != nil {
return nil, errors.New("failed to read initial response").Base(err)
}
if trashHeader[0] == 'k' {
break
}
}
return lazyRawDownload, nil
},
}
// necessary in order to send larger chunks in upload
bufferedUploadPipeWriter := buf.NewBufferedWriter(uploadPipeWriter)
bufferedUploadPipeWriter.SetBuffered(false)
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conn := splitConn{
writer: bufferedUploadPipeWriter,
reader: lazyDownload,
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remoteAddr: remoteAddr,
localAddr: localAddr,
}
return stat.Connection(&conn), nil
}