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dialer_http2.go
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dialer_http2.go
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package main
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"errors"
"io"
"net"
"net/http"
"net/http/httptrace"
"net/url"
"os"
"sync"
"time"
"golang.org/x/net/http2"
)
var _ Dialer = (*HTTP2Dialer)(nil)
type HTTP2Dialer struct {
Username string
Password string
Host string
Port string
UserAgent string
CACert string
ClientKey string
ClientCert string
MaxClients int
Dialer Dialer
mutexes [64]sync.Mutex
clients [64]*http2.Transport
}
func (d *HTTP2Dialer) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
connect := func() (*http2.Transport, error) {
return &http2.Transport{
MaxReadFrameSize: 1024 * 1024, // 1MB read frame, https://github.com/golang/go/issues/47840
DisableCompression: false,
DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
dialer := d.Dialer
if dialer == nil {
dialer = &net.Dialer{}
}
conn, err := dialer.DialContext(ctx, "tcp", net.JoinHostPort(d.Host, d.Port))
if err != nil {
return nil, err
}
tlsConfig := &tls.Config{
NextProtos: []string{"h2"},
InsecureSkipVerify: false,
ServerName: d.Host,
ClientSessionCache: tls.NewLRUClientSessionCache(1024),
}
if d.CACert != "" && d.ClientKey != "" && d.ClientCert != "" {
caData, err := os.ReadFile(d.CACert)
if err != nil {
return nil, err
}
cert, err := tls.LoadX509KeyPair(d.ClientCert, d.ClientKey)
if err != nil {
return nil, err
}
tlsConfig.RootCAs = x509.NewCertPool()
tlsConfig.RootCAs.AppendCertsFromPEM(caData)
tlsConfig.Certificates = []tls.Certificate{cert}
}
tlsConn := tls.Client(conn, tlsConfig)
err = tlsConn.HandshakeContext(ctx)
if err != nil {
return nil, err
}
return tlsConn, nil
},
}, nil
}
maxClient := d.MaxClients
if maxClient == 0 {
maxClient = 1
}
n := 1
if 0 < maxClient && maxClient < len(d.clients) {
n = maxClient
}
n = int(fastrandn(uint32(n)))
if d.clients[n] == nil {
d.mutexes[n].Lock()
c, err := connect()
if err != nil {
d.mutexes[n].Unlock()
return nil, err
}
d.clients[n] = c
d.mutexes[n].Unlock()
}
transport := d.clients[n]
pr, pw := io.Pipe()
req := &http.Request{
ProtoMajor: 2,
Method: http.MethodConnect,
URL: &url.URL{
Scheme: "https",
Host: addr,
},
Host: addr,
Header: http.Header{
"content-type": []string{"application/octet-stream"},
"user-agent": []string{d.UserAgent},
},
Body: pr,
ContentLength: -1,
}
if d.Username != "" && d.Password != "" {
req.Header.Set("proxy-authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(d.Username+":"+d.Password)))
}
var remoteAddr, localAddr net.Addr
req = req.WithContext(httptrace.WithClientTrace(ctx, &httptrace.ClientTrace{
GotConn: func(connInfo httptrace.GotConnInfo) {
remoteAddr, localAddr = connInfo.Conn.RemoteAddr(), connInfo.Conn.LocalAddr()
},
}))
resp, err := transport.RoundTrip(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
data, _ := io.ReadAll(resp.Body)
_ = resp.Body.Close()
return nil, errors.New("proxy: read from " + d.Host + " error: " + resp.Status + ": " + string(data))
}
if remoteAddr == nil || localAddr == nil {
remoteAddr, localAddr = &net.TCPAddr{}, &net.TCPAddr{}
}
conn := &http2Stream{
r: resp.Body,
w: pw,
closed: make(chan struct{}),
remoteAddr: remoteAddr,
localAddr: localAddr,
}
return conn, nil
}
type http2Stream struct {
r io.ReadCloser
w io.Writer
closed chan struct{}
remoteAddr net.Addr
localAddr net.Addr
}
func (c *http2Stream) Read(b []byte) (n int, err error) {
return c.r.Read(b)
}
func (c *http2Stream) Write(b []byte) (n int, err error) {
return c.w.Write(b)
}
func (c *http2Stream) Close() (err error) {
select {
case <-c.closed:
return
default:
close(c.closed)
}
if rc, ok := c.r.(io.Closer); ok {
err = rc.Close()
}
if w, ok := c.w.(io.Closer); ok {
err = w.Close()
}
return
}
func (c *http2Stream) RemoteAddr() net.Addr {
return c.remoteAddr
}
func (c *http2Stream) LocalAddr() net.Addr {
return c.localAddr
}
func (c *http2Stream) SetDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (c *http2Stream) SetReadDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func (c *http2Stream) SetWriteDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}