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asaur/listener.go

88 lines
2.1 KiB
Go

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