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|
package main
import (
"errors"
"fmt"
"golang.org/x/sys/unix"
"net"
"os"
"path"
)
const (
ipcErrorIO = -int64(unix.EIO)
ipcErrorNotDefined = -int64(unix.ENODEV)
ipcErrorProtocol = -int64(unix.EPROTO)
ipcErrorInvalid = -int64(unix.EINVAL)
socketDirectory = "/var/run/wireguard"
socketName = "%s.sock"
)
/* TODO:
* This code can be improved by using fsnotify once:
* https://github.com/fsnotify/fsnotify/pull/205
* Is merged
*/
type UAPIListener struct {
listener net.Listener // unix socket listener
connNew chan net.Conn
connErr chan error
inotifyFd int
}
func (l *UAPIListener) Accept() (net.Conn, error) {
for {
select {
case conn := <-l.connNew:
return conn, nil
case err := <-l.connErr:
return nil, err
}
}
}
func (l *UAPIListener) Close() error {
err1 := unix.Close(l.inotifyFd)
err2 := l.listener.Close()
if err1 != nil {
return err1
}
return err2
}
func (l *UAPIListener) Addr() net.Addr {
return nil
}
func connectUnixSocket(path string) (net.Listener, error) {
// attempt inital connection
listener, err := net.Listen("unix", path)
if err == nil {
return listener, nil
}
// check if active
_, err = net.Dial("unix", path)
if err == nil {
return nil, errors.New("Unix socket in use")
}
// attempt cleanup
err = os.Remove(path)
if err != nil {
return nil, err
}
return net.Listen("unix", path)
}
func NewUAPIListener(name string) (net.Listener, error) {
// check if path exist
err := os.MkdirAll(socketDirectory, 077)
if err != nil && !os.IsExist(err) {
return nil, err
}
// open UNIX socket
socketPath := path.Join(
socketDirectory,
fmt.Sprintf(socketName, name),
)
listener, err := connectUnixSocket(socketPath)
if err != nil {
return nil, err
}
uapi := &UAPIListener{
listener: listener,
connNew: make(chan net.Conn, 1),
connErr: make(chan error, 1),
}
// watch for deletion of socket
uapi.inotifyFd, err = unix.InotifyInit()
if err != nil {
return nil, err
}
_, err = unix.InotifyAddWatch(
uapi.inotifyFd,
socketPath,
unix.IN_ATTRIB|
unix.IN_DELETE|
unix.IN_DELETE_SELF,
)
if err != nil {
return nil, err
}
go func(l *UAPIListener) {
var buff [4096]byte
for {
unix.Read(uapi.inotifyFd, buff[:])
if _, err := os.Lstat(socketPath); os.IsNotExist(err) {
l.connErr <- err
return
}
}
}(uapi)
// watch for new connections
go func(l *UAPIListener) {
for {
conn, err := l.listener.Accept()
if err != nil {
l.connErr <- err
break
}
l.connNew <- conn
}
}(uapi)
return uapi, nil
}
|
