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Copy pathquic.go
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364 lines (310 loc) · 7.37 KB
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package gost
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/tls"
"errors"
"io"
"net"
"sync"
"time"
"github.com/go-log/log"
quic "github.com/lucas-clemente/quic-go"
)
type quicSession struct {
conn net.Conn
session quic.Session
}
func (session *quicSession) GetConn() (*quicConn, error) {
stream, err := session.session.OpenStreamSync()
if err != nil {
return nil, err
}
return &quicConn{
Stream: stream,
laddr: session.session.LocalAddr(),
raddr: session.session.RemoteAddr(),
}, nil
}
func (session *quicSession) Close() error {
return session.session.Close()
}
type quicTransporter struct {
config *QUICConfig
sessionMutex sync.Mutex
sessions map[string]*quicSession
}
// QUICTransporter creates a Transporter that is used by QUIC proxy client.
func QUICTransporter(config *QUICConfig) Transporter {
if config == nil {
config = &QUICConfig{}
}
return &quicTransporter{
config: config,
sessions: make(map[string]*quicSession),
}
}
func (tr *quicTransporter) Dial(addr string, options ...DialOption) (conn net.Conn, err error) {
opts := &DialOptions{}
for _, option := range options {
option(opts)
}
tr.sessionMutex.Lock()
defer tr.sessionMutex.Unlock()
session, ok := tr.sessions[addr]
if !ok {
var cc *net.UDPConn
cc, err = net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
if err != nil {
return
}
conn = cc
if tr.config != nil && tr.config.Key != nil {
conn = &quicCipherConn{UDPConn: cc, key: tr.config.Key}
}
session = &quicSession{conn: conn}
tr.sessions[addr] = session
}
return session.conn, nil
}
func (tr *quicTransporter) Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error) {
opts := &HandshakeOptions{}
for _, option := range options {
option(opts)
}
config := tr.config
if opts.QUICConfig != nil {
config = opts.QUICConfig
}
if config.TLSConfig == nil {
config.TLSConfig = &tls.Config{InsecureSkipVerify: true}
}
tr.sessionMutex.Lock()
defer tr.sessionMutex.Unlock()
timeout := opts.Timeout
if timeout <= 0 {
timeout = HandshakeTimeout
}
conn.SetDeadline(time.Now().Add(timeout))
defer conn.SetDeadline(time.Time{})
session, ok := tr.sessions[opts.Addr]
if session != nil && session.conn != conn {
conn.Close()
return nil, errors.New("quic: unrecognized connection")
}
if !ok || session.session == nil {
s, err := tr.initSession(opts.Addr, conn, config)
if err != nil {
conn.Close()
delete(tr.sessions, opts.Addr)
return nil, err
}
session = s
tr.sessions[opts.Addr] = session
}
cc, err := session.GetConn()
if err != nil {
session.Close()
delete(tr.sessions, opts.Addr)
return nil, err
}
return cc, nil
}
func (tr *quicTransporter) initSession(addr string, conn net.Conn, config *QUICConfig) (*quicSession, error) {
udpConn, ok := conn.(net.PacketConn)
if !ok {
return nil, errors.New("quic: wrong connection type")
}
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
quicConfig := &quic.Config{
HandshakeTimeout: config.Timeout,
KeepAlive: config.KeepAlive,
IdleTimeout: config.IdleTimeout,
Versions: []quic.VersionNumber{
quic.VersionGQUIC43,
quic.VersionGQUIC39,
},
}
session, err := quic.Dial(udpConn, udpAddr, addr, config.TLSConfig, quicConfig)
if err != nil {
log.Logf("quic dial %s: %v", addr, err)
return nil, err
}
return &quicSession{conn: conn, session: session}, nil
}
func (tr *quicTransporter) Multiplex() bool {
return true
}
// QUICConfig is the config for QUIC client and server
type QUICConfig struct {
TLSConfig *tls.Config
Timeout time.Duration
KeepAlive bool
IdleTimeout time.Duration
Key []byte
}
type quicListener struct {
ln quic.Listener
connChan chan net.Conn
errChan chan error
}
// QUICListener creates a Listener for QUIC proxy server.
func QUICListener(addr string, config *QUICConfig) (Listener, error) {
if config == nil {
config = &QUICConfig{}
}
quicConfig := &quic.Config{
HandshakeTimeout: config.Timeout,
KeepAlive: config.KeepAlive,
IdleTimeout: config.IdleTimeout,
}
tlsConfig := config.TLSConfig
if tlsConfig == nil {
tlsConfig = DefaultTLSConfig
}
var conn net.PacketConn
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
lconn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
return nil, err
}
conn = lconn
if config.Key != nil {
conn = &quicCipherConn{UDPConn: lconn, key: config.Key}
}
ln, err := quic.Listen(conn, tlsConfig, quicConfig)
if err != nil {
return nil, err
}
l := &quicListener{
ln: ln,
connChan: make(chan net.Conn, 1024),
errChan: make(chan error, 1),
}
go l.listenLoop()
return l, nil
}
func (l *quicListener) listenLoop() {
for {
session, err := l.ln.Accept()
if err != nil {
log.Log("[quic] accept:", err)
l.errChan <- err
close(l.errChan)
return
}
go l.sessionLoop(session)
}
}
func (l *quicListener) sessionLoop(session quic.Session) {
log.Logf("[quic] %s <-> %s", session.RemoteAddr(), session.LocalAddr())
defer log.Logf("[quic] %s >-< %s", session.RemoteAddr(), session.LocalAddr())
for {
stream, err := session.AcceptStream()
if err != nil {
log.Log("[quic] accept stream:", err)
session.Close()
return
}
cc := &quicConn{Stream: stream, laddr: session.LocalAddr(), raddr: session.RemoteAddr()}
select {
case l.connChan <- cc:
default:
cc.Close()
log.Logf("[quic] %s - %s: connection queue is full", session.RemoteAddr(), session.LocalAddr())
}
}
}
func (l *quicListener) Accept() (conn net.Conn, err error) {
var ok bool
select {
case conn = <-l.connChan:
case err, ok = <-l.errChan:
if !ok {
err = errors.New("accpet on closed listener")
}
}
return
}
func (l *quicListener) Addr() net.Addr {
return l.ln.Addr()
}
func (l *quicListener) Close() error {
return l.ln.Close()
}
type quicConn struct {
quic.Stream
laddr net.Addr
raddr net.Addr
}
func (c *quicConn) LocalAddr() net.Addr {
return c.laddr
}
func (c *quicConn) RemoteAddr() net.Addr {
return c.raddr
}
type quicCipherConn struct {
*net.UDPConn
key []byte
}
func (conn *quicCipherConn) ReadFrom(data []byte) (n int, addr net.Addr, err error) {
n, addr, err = conn.UDPConn.ReadFrom(data)
if err != nil {
return
}
b, err := conn.decrypt(data[:n])
if err != nil {
return
}
copy(data, b)
return len(b), addr, nil
}
func (conn *quicCipherConn) WriteTo(data []byte, addr net.Addr) (n int, err error) {
b, err := conn.encrypt(data)
if err != nil {
return
}
_, err = conn.UDPConn.WriteTo(b, addr)
if err != nil {
return
}
return len(b), nil
}
func (conn *quicCipherConn) encrypt(data []byte) ([]byte, error) {
c, err := aes.NewCipher(conn.key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
return gcm.Seal(nonce, nonce, data, nil), nil
}
func (conn *quicCipherConn) decrypt(data []byte) ([]byte, error) {
c, err := aes.NewCipher(conn.key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonceSize := gcm.NonceSize()
if len(data) < nonceSize {
return nil, errors.New("ciphertext too short")
}
nonce, ciphertext := data[:nonceSize], data[nonceSize:]
return gcm.Open(nil, nonce, ciphertext, nil)
}