Move Linux client & common packages into a public repo.

safesocket/pipe_windows.go

@@ -0,0 +1,59 @@
+// 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)
+}
+
+func ConnCloseRead(c net.Conn) error {
+	return c.(*net.TCPConn).CloseRead()
+}
+
+func ConnCloseWrite(c net.Conn) error {
+	return c.(*net.TCPConn).CloseWrite()
+}
+
+// TODO(apenwarr): handle magic cookie auth
+func Connect(cookie, vendor, name string, port uint16) (net.Conn, error) {
+	p := path(vendor, name, port)
+	pipe, err := net.Dial("tcp", p)
+	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(cookie, vendor, name string, port uint16) (net.Listener, uint16, error) {
+	lc := net.ListenConfig{
+		Control: setFlags,
+	}
+	p := path(vendor, name, port)
+	pipe, err := lc.Listen(context.Background(), "tcp", p)
+	if err != nil {
+		return nil, 0, err
+	}
+	return pipe, uint16(pipe.Addr().(*net.TCPAddr).Port), err
+}