81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
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package udp
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import (
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"github.com/Dreamacro/clash/transport/hysteria/obfs"
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"net"
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"sync"
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"time"
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)
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const udpBufferSize = 65535
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type ObfsUDPConn struct {
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orig net.PacketConn
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obfs obfs.Obfuscator
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readBuf []byte
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readMutex sync.Mutex
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writeBuf []byte
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writeMutex sync.Mutex
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}
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func NewObfsUDPConn(orig net.PacketConn, obfs obfs.Obfuscator) *ObfsUDPConn {
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return &ObfsUDPConn{
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orig: orig,
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obfs: obfs,
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readBuf: make([]byte, udpBufferSize),
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writeBuf: make([]byte, udpBufferSize),
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}
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}
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func (c *ObfsUDPConn) ReadFrom(p []byte) (int, net.Addr, error) {
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for {
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c.readMutex.Lock()
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n, addr, err := c.orig.ReadFrom(c.readBuf)
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if n <= 0 {
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c.readMutex.Unlock()
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return 0, addr, err
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}
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newN := c.obfs.Deobfuscate(c.readBuf[:n], p)
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c.readMutex.Unlock()
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if newN > 0 {
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// Valid packet
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return newN, addr, err
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} else if err != nil {
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// Not valid and orig.ReadFrom had some error
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return 0, addr, err
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}
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}
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}
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func (c *ObfsUDPConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
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c.writeMutex.Lock()
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bn := c.obfs.Obfuscate(p, c.writeBuf)
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_, err = c.orig.WriteTo(c.writeBuf[:bn], addr)
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c.writeMutex.Unlock()
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if err != nil {
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return 0, err
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} else {
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return len(p), nil
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}
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}
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func (c *ObfsUDPConn) Close() error {
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return c.orig.Close()
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}
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func (c *ObfsUDPConn) LocalAddr() net.Addr {
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return c.orig.LocalAddr()
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}
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func (c *ObfsUDPConn) SetDeadline(t time.Time) error {
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return c.orig.SetDeadline(t)
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}
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func (c *ObfsUDPConn) SetReadDeadline(t time.Time) error {
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return c.orig.SetReadDeadline(t)
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}
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func (c *ObfsUDPConn) SetWriteDeadline(t time.Time) error {
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return c.orig.SetWriteDeadline(t)
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}
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