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dialer.go
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dialer.go
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package http
import (
"context"
gotls "crypto/tls"
gonet "net"
"net/http"
"net/url"
"sync"
"golang.org/x/net/http2"
core "github.com/v2fly/v2ray-core/v5"
"github.com/v2fly/v2ray-core/v5/common"
"github.com/v2fly/v2ray-core/v5/common/buf"
"github.com/v2fly/v2ray-core/v5/common/net"
"github.com/v2fly/v2ray-core/v5/transport/internet"
"github.com/v2fly/v2ray-core/v5/transport/internet/security"
"github.com/v2fly/v2ray-core/v5/transport/pipe"
)
var (
globalDialerMap map[net.Destination]*http.Client
globalDialerAccess sync.Mutex
)
type dialerCanceller func()
func getHTTPClient(ctx context.Context, dest net.Destination, securityEngine *security.Engine, streamSettings *internet.MemoryStreamConfig) (*http.Client, dialerCanceller) {
globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
canceller := func() {
globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
delete(globalDialerMap, dest)
}
if globalDialerMap == nil {
globalDialerMap = make(map[net.Destination]*http.Client)
}
if client, found := globalDialerMap[dest]; found {
return client, canceller
}
transport := &http2.Transport{
DialTLSContext: func(_ context.Context, network, addr string, tlsConfig *gotls.Config) (gonet.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)
detachedContext := core.ToBackgroundDetachedContext(ctx)
pconn, err := internet.DialSystem(detachedContext, net.TCPDestination(address, port), streamSettings.SocketSettings)
if err != nil {
return nil, err
}
cn, err := (*securityEngine).Client(pconn,
security.OptionWithDestination{Dest: dest})
if err != nil {
return nil, err
}
protocol := ""
if connAPLNGetter, ok := cn.(security.ConnectionApplicationProtocol); ok {
connectionALPN, err := connAPLNGetter.GetConnectionApplicationProtocol()
if err != nil {
return nil, newError("failed to get connection ALPN").Base(err).AtWarning()
}
protocol = connectionALPN
}
if protocol != http2.NextProtoTLS {
return nil, newError("http2: unexpected ALPN protocol " + protocol + "; want q" + http2.NextProtoTLS).AtError()
}
return cn, nil
},
}
client := &http.Client{
Transport: transport,
}
globalDialerMap[dest] = client
return client, canceller
}
// 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)
securityEngine, err := security.CreateSecurityEngineFromSettings(ctx, streamSettings)
if err != nil {
return nil, newError("unable to create security engine").Base(err)
}
if securityEngine == nil {
return nil, newError("TLS must be enabled for http transport.").AtWarning()
}
client, canceller := getHTTPClient(ctx, dest, &securityEngine, streamSettings)
opts := pipe.OptionsFromContext(ctx)
preader, pwriter := pipe.New(opts...)
breader := &buf.BufferedReader{Reader: preader}
httpMethod := "PUT"
if httpSettings.Method != "" {
httpMethod = httpSettings.Method
}
httpHeaders := make(http.Header)
for _, httpHeader := range httpSettings.Header {
for _, httpHeaderValue := range httpHeader.Value {
httpHeaders.Set(httpHeader.Name, httpHeaderValue)
}
}
request := &http.Request{
Method: httpMethod,
Host: httpSettings.getRandomHost(),
Body: breader,
URL: &url.URL{
Scheme: "https",
Host: dest.NetAddr(),
Path: httpSettings.getNormalizedPath(),
},
Proto: "HTTP/2",
ProtoMajor: 2,
ProtoMinor: 0,
Header: httpHeaders,
}
// Disable any compression method from server.
request.Header.Set("Accept-Encoding", "identity")
response, err := client.Do(request) // nolint: bodyclose
if err != nil {
canceller()
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 net.NewConnection(
net.ConnectionOutput(response.Body),
net.ConnectionInput(bwriter),
net.ConnectionOnClose(common.ChainedClosable{breader, bwriter, response.Body}),
), nil
}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, Dial))
}