mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
4460bd638b
On unix, we want to provide a full path to the desired unix socket. On windows, currently we want to provide a TCP port, but someday we'll also provide a "path-ish" object for a named pipe. For now, simplify the API down to exactly a path and a TCP port. Signed-off-by: David Anderson <dave@natulte.net>
57 lines
1.5 KiB
Go
57 lines
1.5 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.
|
|
|
|
// +build !windows
|
|
|
|
package safesocket
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
)
|
|
|
|
func ConnCloseRead(c net.Conn) error {
|
|
return c.(*net.UnixConn).CloseRead()
|
|
}
|
|
|
|
func ConnCloseWrite(c net.Conn) error {
|
|
return c.(*net.UnixConn).CloseWrite()
|
|
}
|
|
|
|
// TODO(apenwarr): handle magic cookie auth
|
|
func Connect(path string, port uint16) (net.Conn, error) {
|
|
pipe, err := net.Dial("unix", path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return pipe, err
|
|
}
|
|
|
|
// TODO(apenwarr): handle magic cookie auth
|
|
func Listen(path string, port uint16) (net.Listener, uint16, error) {
|
|
// Unix sockets hang around in the filesystem even after nobody
|
|
// is listening on them. (Which is really unfortunate but long-
|
|
// entrenched semantics.) Try connecting first; if it works, then
|
|
// the socket is still live, so let's not replace it. If it doesn't
|
|
// work, then replace it.
|
|
//
|
|
// Note that there's a race condition between these two steps. A
|
|
// "proper" daemon usually uses a dance involving pidfiles to first
|
|
// ensure that no other instances of itself are running, but that's
|
|
// beyond the scope of our simple socket library.
|
|
c, err := net.Dial("unix", path)
|
|
if err == nil {
|
|
c.Close()
|
|
return nil, 0, fmt.Errorf("%v: address already in use", path)
|
|
}
|
|
_ = os.Remove(path)
|
|
pipe, err := net.Listen("unix", path)
|
|
if err != nil {
|
|
return nil, 0, err
|
|
}
|
|
os.Chmod(path, 0666)
|
|
return pipe, 0, err
|
|
}
|