Xray-core/transport/internet/quic/conn.go

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package quic
import (
"crypto/cipher"
"crypto/rand"
"errors"
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"syscall"
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"time"
"github.com/lucas-clemente/quic-go"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/transport/internet"
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)
type sysConn struct {
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conn *net.UDPConn
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header internet.PacketHeader
auth cipher.AEAD
}
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func wrapSysConn(rawConn *net.UDPConn, config *Config) (*sysConn, error) {
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header, err := getHeader(config)
if err != nil {
return nil, err
}
auth, err := getAuth(config)
if err != nil {
return nil, err
}
return &sysConn{
conn: rawConn,
header: header,
auth: auth,
}, nil
}
var errInvalidPacket = errors.New("invalid packet")
func (c *sysConn) readFromInternal(p []byte) (int, net.Addr, error) {
buffer := getBuffer()
defer putBuffer(buffer)
nBytes, addr, err := c.conn.ReadFrom(buffer)
if err != nil {
return 0, nil, err
}
payload := buffer[:nBytes]
if c.header != nil {
if len(payload) <= int(c.header.Size()) {
return 0, nil, errInvalidPacket
}
payload = payload[c.header.Size():]
}
if c.auth == nil {
n := copy(p, payload)
return n, addr, nil
}
if len(payload) <= c.auth.NonceSize() {
return 0, nil, errInvalidPacket
}
nonce := payload[:c.auth.NonceSize()]
payload = payload[c.auth.NonceSize():]
p, err = c.auth.Open(p[:0], nonce, payload, nil)
if err != nil {
return 0, nil, errInvalidPacket
}
return len(p), addr, nil
}
func (c *sysConn) ReadFrom(p []byte) (int, net.Addr, error) {
if c.header == nil && c.auth == nil {
return c.conn.ReadFrom(p)
}
for {
n, addr, err := c.readFromInternal(p)
if err != nil && err != errInvalidPacket {
return 0, nil, err
}
if err == nil {
return n, addr, nil
}
}
}
func (c *sysConn) WriteTo(p []byte, addr net.Addr) (int, error) {
if c.header == nil && c.auth == nil {
return c.conn.WriteTo(p, addr)
}
buffer := getBuffer()
defer putBuffer(buffer)
payload := buffer
n := 0
if c.header != nil {
c.header.Serialize(payload)
n = int(c.header.Size())
}
if c.auth == nil {
nBytes := copy(payload[n:], p)
n += nBytes
} else {
nounce := payload[n : n+c.auth.NonceSize()]
common.Must2(rand.Read(nounce))
n += c.auth.NonceSize()
pp := c.auth.Seal(payload[:n], nounce, p, nil)
n = len(pp)
}
return c.conn.WriteTo(payload[:n], addr)
}
func (c *sysConn) Close() error {
return c.conn.Close()
}
func (c *sysConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
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func (c *sysConn) SetReadBuffer(bytes int) error {
return c.conn.SetReadBuffer(bytes)
}
func (c *sysConn) SetWriteBuffer(bytes int) error {
return c.conn.SetWriteBuffer(bytes)
}
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func (c *sysConn) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *sysConn) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *sysConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
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func (c *sysConn) SyscallConn() (syscall.RawConn, error) {
return c.conn.SyscallConn()
}
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type interConn struct {
stream quic.Stream
local net.Addr
remote net.Addr
}
func (c *interConn) Read(b []byte) (int, error) {
return c.stream.Read(b)
}
func (c *interConn) WriteMultiBuffer(mb buf.MultiBuffer) error {
mb = buf.Compact(mb)
mb, err := buf.WriteMultiBuffer(c, mb)
buf.ReleaseMulti(mb)
return err
}
func (c *interConn) Write(b []byte) (int, error) {
return c.stream.Write(b)
}
func (c *interConn) Close() error {
return c.stream.Close()
}
func (c *interConn) LocalAddr() net.Addr {
return c.local
}
func (c *interConn) RemoteAddr() net.Addr {
return c.remote
}
func (c *interConn) SetDeadline(t time.Time) error {
return c.stream.SetDeadline(t)
}
func (c *interConn) SetReadDeadline(t time.Time) error {
return c.stream.SetReadDeadline(t)
}
func (c *interConn) SetWriteDeadline(t time.Time) error {
return c.stream.SetWriteDeadline(t)
}