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116f55ff66
Updates #5210 Change-Id: Ib02cd5e43d0a8db60c1f09755a8ac7b140b670be Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package safesocket
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import (
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"context"
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"fmt"
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"net"
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"syscall"
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)
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func connect(s *ConnectionStrategy) (net.Conn, error) {
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pipe, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", s.port))
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if err != nil {
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return nil, err
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}
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return pipe, err
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}
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func setFlags(network, address string, c syscall.RawConn) error {
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return c.Control(func(fd uintptr) {
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syscall.SetsockoptInt(syscall.Handle(fd), syscall.SOL_SOCKET,
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syscall.SO_REUSEADDR, 1)
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})
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}
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// TODO(apenwarr): use named pipes instead of sockets?
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//
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// I tried to use winio.ListenPipe() here, but that code is a disaster,
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// built on top of an API that's a disaster. So for now we'll hack it by
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// just always using a TCP session on a fixed port on localhost. As a
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// result, on Windows we ignore the vendor and name strings.
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// NOTE(bradfitz): Jason did a new pipe package: https://go-review.googlesource.com/c/sys/+/299009
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func listen(path string, port uint16) (_ net.Listener, gotPort uint16, _ error) {
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lc := net.ListenConfig{
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Control: setFlags,
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}
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pipe, err := lc.Listen(context.Background(), "tcp", fmt.Sprintf("127.0.0.1:%d", port))
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if err != nil {
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return nil, 0, err
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}
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return pipe, uint16(pipe.Addr().(*net.TCPAddr).Port), err
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}
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