35 lines
601 B
Go
35 lines
601 B
Go
package libbox
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import (
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"golang.org/x/sys/unix"
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)
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// kanged from wireauard-apple
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const utunControlName = "com.apple.net.utun_control"
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func GetTunnelFileDescriptor() int32 {
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ctlInfo := &unix.CtlInfo{}
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copy(ctlInfo.Name[:], utunControlName)
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for fd := 0; fd < 1024; fd++ {
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addr, err := unix.Getpeername(fd)
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if err != nil {
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continue
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}
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addrCTL, loaded := addr.(*unix.SockaddrCtl)
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if !loaded {
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continue
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}
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if ctlInfo.Id == 0 {
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err = unix.IoctlCtlInfo(fd, ctlInfo)
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if err != nil {
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continue
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}
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}
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if addrCTL.ID == ctlInfo.Id {
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return int32(fd)
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}
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}
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return -1
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}
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