88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
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// listener.go - Tor backed net.Listener.
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//
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// To the extent possible under law, Yawning Angel waived all copyright
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// and related or neighboring rights to bulb, using the creative
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// commons "cc0" public domain dedication. See LICENSE or
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// <http://creativecommons.org/publicdomain/zero/1.0/> for full details.
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package bulb
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import (
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"crypto"
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"fmt"
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"net"
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"strconv"
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)
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type onionAddr struct {
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info *OnionInfo
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port uint16
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}
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func (a *onionAddr) Network() string {
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return "tcp"
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}
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func (a *onionAddr) String() string {
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return fmt.Sprintf("%s.onion:%d", a.info.OnionID, a.port)
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}
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type onionListener struct {
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addr *onionAddr
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ctrlConn *Conn
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listener net.Listener
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}
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func (l *onionListener) Accept() (net.Conn, error) {
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return l.listener.Accept()
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}
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func (l *onionListener) Close() (err error) {
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if err = l.listener.Close(); err == nil {
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// Only delete the onion once.
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err = l.ctrlConn.DeleteOnion(l.addr.info.OnionID)
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}
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return err
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}
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func (l *onionListener) Addr() net.Addr {
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return l.addr
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}
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// Listener returns a net.Listener backed by a Onion Service, optionally
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// having Tor generate an ephemeral private key. Regardless of the status of
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// the returned Listener, the Onion Service will be torn down when the control
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// connection is closed.
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//
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// WARNING: Only one port can be listened to per PrivateKey if this interface
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// is used. To bind to more ports, use the AddOnion call directly.
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func (c *Conn) Listener(port uint16, key crypto.PrivateKey) (net.Listener, error) {
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const (
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loopbackAddr = "127.0.0.1:0"
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)
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// Listen on the loopback interface.
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tcpListener, err := net.Listen("tcp4", loopbackAddr)
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if err != nil {
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return nil, err
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}
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tAddr, ok := tcpListener.Addr().(*net.TCPAddr)
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if !ok {
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tcpListener.Close()
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return nil, newProtocolError("failed to extract local port")
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}
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// Create the onion.
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ports := []OnionPortSpec{{port, strconv.FormatUint((uint64)(tAddr.Port), 10)}}
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oi, err := c.AddOnion(ports, key, key == nil)
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if err != nil {
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tcpListener.Close()
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return nil, err
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}
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oa := &onionAddr{info: oi, port: port}
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ol := &onionListener{addr: oa, ctrlConn: c, listener: tcpListener}
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return ol, nil
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}
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