50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package safesocket
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
"syscall"
|
|
)
|
|
|
|
func path(vendor, name string, port uint16) string {
|
|
return fmt.Sprintf("127.0.0.1:%v", port)
|
|
}
|
|
|
|
// TODO(apenwarr): handle magic cookie auth
|
|
func connect(path string, port uint16) (net.Conn, error) {
|
|
pipe, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", port))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return pipe, err
|
|
}
|
|
|
|
func setFlags(network, address string, c syscall.RawConn) error {
|
|
return c.Control(func(fd uintptr) {
|
|
syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET,
|
|
syscall.SO_REUSEADDR, 1)
|
|
})
|
|
}
|
|
|
|
// TODO(apenwarr): use named pipes instead of sockets?
|
|
// I tried to use winio.ListenPipe() here, but that code is a disaster,
|
|
// built on top of an API that's a disaster. So for now we'll hack it by
|
|
// just always using a TCP session on a fixed port on localhost. As a
|
|
// result, on Windows we ignore the vendor and name strings.
|
|
// TODO(apenwarr): handle magic cookie auth
|
|
func listen(path string, port uint16) (_ net.Listener, gotPort uint16, _ error) {
|
|
lc := net.ListenConfig{
|
|
Control: setFlags,
|
|
}
|
|
pipe, err := lc.Listen(context.Background(), "tcp", fmt.Sprintf("127.0.0.1:%d", port))
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
return pipe, uint16(pipe.Addr().(*net.TCPAddr).Port), err
|
|
}
|