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package lib
import (
"bufio"
"errors"
"io"
"net"
"time"
"git.torproject.org/pluggable-transports/snowflake.git/common/encapsulation"
)
var errNotImplemented = errors.New("not implemented")
// EncapsulationPacketConn implements the net.PacketConn interface over an
// io.ReadWriteCloser stream, using the encapsulation package to represent
// packets in a stream.
type EncapsulationPacketConn struct {
io.ReadWriteCloser
localAddr net.Addr
remoteAddr net.Addr
bw *bufio.Writer
}
// NewEncapsulationPacketConn makes
func NewEncapsulationPacketConn(
localAddr, remoteAddr net.Addr,
conn io.ReadWriteCloser,
) *EncapsulationPacketConn {
return &EncapsulationPacketConn{
ReadWriteCloser: conn,
localAddr: localAddr,
remoteAddr: remoteAddr,
bw: bufio.NewWriter(conn),
}
}
// ReadFrom reads an encapsulated packet from the stream.
func (c *EncapsulationPacketConn) ReadFrom(p []byte) (int, net.Addr, error) {
data, err := encapsulation.ReadData(c.ReadWriteCloser)
if err != nil {
return 0, c.remoteAddr, err
}
return copy(p, data), c.remoteAddr, nil
}
// WriteTo writes an encapsulated packet to the stream.
func (c *EncapsulationPacketConn) WriteTo(p []byte, addr net.Addr) (int, error) {
// addr is ignored.
_, err := encapsulation.WriteData(c.bw, p)
if err == nil {
err = c.bw.Flush()
}
if err != nil {
return 0, err
}
return len(p), nil
}
// LocalAddr returns the localAddr value that was passed to
// NewEncapsulationPacketConn.
func (c *EncapsulationPacketConn) LocalAddr() net.Addr {
return c.localAddr
}
func (c *EncapsulationPacketConn) SetDeadline(t time.Time) error { return errNotImplemented }
func (c *EncapsulationPacketConn) SetReadDeadline(t time.Time) error { return errNotImplemented }
func (c *EncapsulationPacketConn) SetWriteDeadline(t time.Time) error { return errNotImplemented }
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