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/* SPDX-License-Identifier: MIT | ||
* | ||
* Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. | ||
*/ | ||
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package ipc | ||
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import ( | ||
"net" | ||
"os" | ||
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"golang.org/x/sys/unix" | ||
) | ||
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type UAPIListener struct { | ||
listener net.Listener // unix socket listener | ||
connNew chan net.Conn | ||
connErr chan error | ||
evPort *unix.EventPort | ||
} | ||
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func (l *UAPIListener) Accept() (net.Conn, error) { | ||
for { | ||
select { | ||
case conn := <-l.connNew: | ||
return conn, nil | ||
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case err := <-l.connErr: | ||
return nil, err | ||
} | ||
} | ||
} | ||
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func (l *UAPIListener) Close() error { | ||
err1 := l.evPort.Close() | ||
err2 := l.listener.Close() | ||
if err1 != nil { | ||
return err1 | ||
} | ||
return err2 | ||
} | ||
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func (l *UAPIListener) Addr() net.Addr { | ||
return l.listener.Addr() | ||
} | ||
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func UAPIListen(name string, file *os.File) (net.Listener, error) { | ||
listener, err := net.FileListener(file) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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uapi := &UAPIListener{ | ||
listener: listener, | ||
connNew: make(chan net.Conn, 1), | ||
connErr: make(chan error, 1), | ||
} | ||
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if unixListener, ok := listener.(*net.UnixListener); ok { | ||
unixListener.SetUnlinkOnClose(true) | ||
} | ||
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socketPath := sockPath(name) | ||
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uapi.evPort, err = unix.NewEventPort() | ||
if err != nil { | ||
return nil, err | ||
} | ||
stat, err := os.Lstat(socketPath) | ||
if err != nil { | ||
return nil, err | ||
} | ||
err = uapi.evPort.AssociatePath(socketPath, stat, unix.FILE_MODIFIED|unix.FILE_ATTRIB|unix.FILE_NOFOLLOW, nil) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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go func(l *UAPIListener) { | ||
for { | ||
// start with lstat to avoid race condition | ||
if _, err := os.Lstat(socketPath); os.IsNotExist(err) { | ||
l.connErr <- err | ||
return | ||
} | ||
_, perr := l.evPort.GetOne(nil) | ||
if perr == unix.EINTR { | ||
// If we were interrupted, resume watching. | ||
continue | ||
} | ||
if perr != nil { | ||
l.connErr <- perr | ||
return | ||
} | ||
} | ||
}(uapi) | ||
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// watch for new connections | ||
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go func(l *UAPIListener) { | ||
for { | ||
conn, err := l.listener.Accept() | ||
if err != nil { | ||
l.connErr <- err | ||
break | ||
} | ||
l.connNew <- conn | ||
} | ||
}(uapi) | ||
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return uapi, nil | ||
} |
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