Xray-core/proxy/http/client.go

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2020-11-25 13:01:53 +02:00
package http
import (
"bufio"
"context"
"encoding/base64"
"io"
"net/http"
"net/url"
"sync"
"golang.org/x/net/http2"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/bytespool"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/retry"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/transport"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/tls"
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)
type Client struct {
serverPicker protocol.ServerPicker
policyManager policy.Manager
}
type h2Conn struct {
rawConn net.Conn
h2Conn *http2.ClientConn
}
var (
cachedH2Mutex sync.Mutex
cachedH2Conns map[net.Destination]h2Conn
)
// NewClient create a new http client based on the given config.
func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
serverList := protocol.NewServerList()
for _, rec := range config.Server {
s, err := protocol.NewServerSpecFromPB(rec)
if err != nil {
return nil, newError("failed to get server spec").Base(err)
}
serverList.AddServer(s)
}
if serverList.Size() == 0 {
return nil, newError("0 target server")
}
v := core.MustFromContext(ctx)
return &Client{
serverPicker: protocol.NewRoundRobinServerPicker(serverList),
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}, nil
}
// Process implements proxy.Outbound.Process. We first create a socket tunnel via HTTP CONNECT method, then redirect all inbound traffic to that tunnel.
func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
outbound := session.OutboundFromContext(ctx)
if outbound == nil || !outbound.Target.IsValid() {
return newError("target not specified.")
}
target := outbound.Target
targetAddr := target.NetAddr()
if target.Network == net.Network_UDP {
return newError("UDP is not supported by HTTP outbound")
}
var user *protocol.MemoryUser
var conn internet.Connection
mbuf, _ := link.Reader.ReadMultiBuffer()
len := mbuf.Len()
firstPayload := bytespool.Alloc(len)
mbuf, _ = buf.SplitBytes(mbuf, firstPayload)
firstPayload = firstPayload[:len]
buf.ReleaseMulti(mbuf)
defer bytespool.Free(firstPayload)
if err := retry.ExponentialBackoff(5, 100).On(func() error {
server := c.serverPicker.PickServer()
dest := server.Destination()
user = server.PickUser()
netConn, err := setUpHTTPTunnel(ctx, dest, targetAddr, user, dialer, firstPayload)
if netConn != nil {
if _, ok := netConn.(*http2Conn); !ok {
if _, err := netConn.Write(firstPayload); err != nil {
netConn.Close()
return err
}
}
conn = internet.Connection(netConn)
}
return err
}); err != nil {
return newError("failed to find an available destination").Base(err)
}
defer func() {
if err := conn.Close(); err != nil {
newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
}()
p := c.policyManager.ForLevel(0)
if user != nil {
p = c.policyManager.ForLevel(user.Level)
}
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, p.Timeouts.ConnectionIdle)
requestFunc := func() error {
defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
}
responseFunc := func() error {
defer timer.SetTimeout(p.Timeouts.UplinkOnly)
return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
}
var responseDonePost = task.OnSuccess(responseFunc, task.Close(link.Writer))
if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
return newError("connection ends").Base(err)
}
return nil
}
// setUpHTTPTunnel will create a socket tunnel via HTTP CONNECT method
func setUpHTTPTunnel(ctx context.Context, dest net.Destination, target string, user *protocol.MemoryUser, dialer internet.Dialer, firstPayload []byte) (net.Conn, error) {
req := &http.Request{
Method: http.MethodConnect,
URL: &url.URL{Host: target},
Header: make(http.Header),
Host: target,
}
if user != nil && user.Account != nil {
account := user.Account.(*Account)
auth := account.GetUsername() + ":" + account.GetPassword()
req.Header.Set("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(auth)))
}
connectHTTP1 := func(rawConn net.Conn) (net.Conn, error) {
req.Header.Set("Proxy-Connection", "Keep-Alive")
err := req.Write(rawConn)
if err != nil {
rawConn.Close()
return nil, err
}
resp, err := http.ReadResponse(bufio.NewReader(rawConn), req)
if err != nil {
rawConn.Close()
return nil, err
}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
rawConn.Close()
return nil, newError("Proxy responded with non 200 code: " + resp.Status)
}
return rawConn, nil
}
connectHTTP2 := func(rawConn net.Conn, h2clientConn *http2.ClientConn) (net.Conn, error) {
pr, pw := io.Pipe()
req.Body = pr
var pErr error
var wg sync.WaitGroup
wg.Add(1)
go func() {
_, pErr = pw.Write(firstPayload)
wg.Done()
}()
resp, err := h2clientConn.RoundTrip(req)
if err != nil {
rawConn.Close()
return nil, err
}
wg.Wait()
if pErr != nil {
rawConn.Close()
return nil, pErr
}
if resp.StatusCode != http.StatusOK {
rawConn.Close()
return nil, newError("Proxy responded with non 200 code: " + resp.Status)
}
return newHTTP2Conn(rawConn, pw, resp.Body), nil
}
cachedH2Mutex.Lock()
cachedConn, cachedConnFound := cachedH2Conns[dest]
cachedH2Mutex.Unlock()
if cachedConnFound {
rc, cc := cachedConn.rawConn, cachedConn.h2Conn
if cc.CanTakeNewRequest() {
proxyConn, err := connectHTTP2(rc, cc)
if err != nil {
return nil, err
}
return proxyConn, nil
}
}
rawConn, err := dialer.Dial(ctx, dest)
if err != nil {
return nil, err
}
iConn := rawConn
if statConn, ok := iConn.(*internet.StatCouterConnection); ok {
iConn = statConn.Connection
}
nextProto := ""
if tlsConn, ok := iConn.(*tls.Conn); ok {
if err := tlsConn.Handshake(); err != nil {
rawConn.Close()
return nil, err
}
nextProto = tlsConn.ConnectionState().NegotiatedProtocol
}
switch nextProto {
case "", "http/1.1":
return connectHTTP1(rawConn)
case "h2":
t := http2.Transport{}
h2clientConn, err := t.NewClientConn(rawConn)
if err != nil {
rawConn.Close()
return nil, err
}
proxyConn, err := connectHTTP2(rawConn, h2clientConn)
if err != nil {
rawConn.Close()
return nil, err
}
cachedH2Mutex.Lock()
if cachedH2Conns == nil {
cachedH2Conns = make(map[net.Destination]h2Conn)
}
cachedH2Conns[dest] = h2Conn{
rawConn: rawConn,
h2Conn: h2clientConn,
}
cachedH2Mutex.Unlock()
return proxyConn, err
default:
return nil, newError("negotiated unsupported application layer protocol: " + nextProto)
}
}
func newHTTP2Conn(c net.Conn, pipedReqBody *io.PipeWriter, respBody io.ReadCloser) net.Conn {
return &http2Conn{Conn: c, in: pipedReqBody, out: respBody}
}
type http2Conn struct {
net.Conn
in *io.PipeWriter
out io.ReadCloser
}
func (h *http2Conn) Read(p []byte) (n int, err error) {
return h.out.Read(p)
}
func (h *http2Conn) Write(p []byte) (n int, err error) {
return h.in.Write(p)
}
func (h *http2Conn) Close() error {
h.in.Close()
return h.out.Close()
}
func init() {
common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewClient(ctx, config.(*ClientConfig))
}))
}