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package hst
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
"github.com/quic-go/quic-go/http3"
"github.com/quic-go/quic-go/quicvarint"
)
type CapsuleParseError struct {
Err error
}
func (e *CapsuleParseError) Error() string {
return e.Err.Error()
}
type ConnectUdpClient struct {
log bool
suite *HstSuite
timeout time.Duration
Conn net.Conn
}
func (s *HstSuite) NewConnectUdpClient(timeout time.Duration, log bool) *ConnectUdpClient {
client := &ConnectUdpClient{log: log, suite: s, timeout: timeout}
return client
}
func writeConnectUdpReq(target string) []byte {
var b bytes.Buffer
fmt.Fprintf(&b, "GET %s HTTP/1.1\r\n", target)
u, _ := url.Parse(target)
fmt.Fprintf(&b, "Host: %s\r\n", u.Host)
fmt.Fprintf(&b, "User-Agent: hs-test\r\n")
fmt.Fprintf(&b, "Connection: Upgrade\r\n")
fmt.Fprintf(&b, "Upgrade: connect-udp\r\n")
fmt.Fprintf(&b, "Capsule-Protocol: ?1\r\n")
io.WriteString(&b, "\r\n")
return b.Bytes()
}
func (c *ConnectUdpClient) Dial(proxyAddress, targetUri string) error {
req := writeConnectUdpReq(targetUri)
conn, err := net.DialTimeout("tcp", proxyAddress, c.timeout)
if err != nil {
return err
}
if c.log {
c.suite.Log("* Connected to proxy")
}
conn.SetDeadline(time.Now().Add(time.Second * c.timeout))
_, err = conn.Write(req)
if err != nil {
return err
}
r := bufio.NewReader(conn)
resp, err := http.ReadResponse(r, nil)
if err != nil {
return err
}
if c.log {
c.suite.Log(DumpHttpResp(resp, true))
}
if resp.StatusCode != http.StatusSwitchingProtocols {
return errors.New("request failed: " + resp.Status)
}
if resp.Header.Get("Connection") != "upgrade" || resp.Header.Get("Upgrade") != "connect-udp" || resp.Header.Get("Capsule-Protocol") != "?1" {
conn.Close()
return errors.New("invalid response")
}
if c.log {
c.suite.Log("* CONNECT-UDP tunnel established")
}
c.Conn = conn
return nil
}
func (c *ConnectUdpClient) Close() error {
return c.Conn.Close()
}
func (c *ConnectUdpClient) WriteCapsule(capsuleType http3.CapsuleType, payload []byte) error {
err := c.Conn.SetWriteDeadline(time.Now().Add(c.timeout))
if err != nil {
return err
}
var buf bytes.Buffer
err = http3.WriteCapsule(&buf, capsuleType, payload)
if err != nil {
return err
}
_, err = c.Conn.Write(buf.Bytes())
if err != nil {
return err
}
return nil
}
func (c *ConnectUdpClient) WriteDgramCapsule(payload []byte) error {
b := make([]byte, 0)
b = quicvarint.Append(b, 0)
b = append(b, payload...)
return c.WriteCapsule(0, b)
}
func (c *ConnectUdpClient) ReadDgramCapsule() ([]byte, error) {
err := c.Conn.SetReadDeadline(time.Now().Add(c.timeout))
if err != nil {
return nil, err
}
r := bufio.NewReader(c.Conn)
capsuleType, payloadReader, err := http3.ParseCapsule(r)
if err != nil {
return nil, err
}
if capsuleType != 0 {
return nil, &CapsuleParseError{errors.New("capsule type should be 0")}
}
b := make([]byte, 1024)
n, err := payloadReader.Read(b)
if err != nil {
return nil, err
}
if n < 3 {
return nil, &CapsuleParseError{errors.New("response payload too short")}
}
if b[0] != 0 {
return nil, &CapsuleParseError{errors.New("context id should be 0")}
}
return b[1:n], nil
}
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