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//go:build linux || darwin || freebsd || openbsd
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2022 WireGuard LLC. All Rights Reserved.
*/
package ipc
import (
"errors"
"fmt"
"net"
"os"
"golang.org/x/sys/unix"
)
const (
IpcErrorIO = -int64(unix.EIO)
IpcErrorProtocol = -int64(unix.EPROTO)
IpcErrorInvalid = -int64(unix.EINVAL)
IpcErrorPortInUse = -int64(unix.EADDRINUSE)
IpcErrorUnknown = -55 // ENOANO
)
// socketDirectory is variable because it is modified by a linker
// flag in wireguard-android.
var socketDirectory = "/var/run/wireguard"
func sockPath(iface string) string {
return fmt.Sprintf("%s/%s.sock", socketDirectory, iface)
}
func UAPIOpen(name string) (*os.File, error) {
if err := os.MkdirAll(socketDirectory, 0o755); err != nil {
return nil, err
}
socketPath := sockPath(name)
addr, err := net.ResolveUnixAddr("unix", socketPath)
if err != nil {
return nil, err
}
oldUmask := unix.Umask(0o077)
defer unix.Umask(oldUmask)
listener, err := net.ListenUnix("unix", addr)
if err == nil {
return listener.File()
}
// Test socket, if not in use cleanup and try again.
if _, err := net.Dial("unix", socketPath); err == nil {
return nil, errors.New("unix socket in use")
}
if err := os.Remove(socketPath); err != nil {
return nil, err
}
listener, err = net.ListenUnix("unix", addr)
if err != nil {
return nil, err
}
return listener.File()
}
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