43 lines
811 B
Go
43 lines
811 B
Go
//go:build linux || darwin
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package tun
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import (
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"fmt"
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"os"
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"path/filepath"
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"golang.org/x/sys/unix"
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)
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// Create creates a TUN device at the path specified.
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func (t *Tun) Create(path string) error {
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parentDir := filepath.Dir(path)
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if err := os.MkdirAll(parentDir, 0751); err != nil {
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return err
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}
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const (
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major = 10
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minor = 200
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)
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dev := unix.Mkdev(major, minor)
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err := unix.Mknod(path, unix.S_IFCHR, int(dev))
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if err != nil {
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return fmt.Errorf("creating TUN device file node: %w", err)
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}
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fd, err := unix.Open(path, 0, 0)
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if err != nil {
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return fmt.Errorf("unix opening TUN device file: %w", err)
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}
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const nonBlocking = true
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err = unix.SetNonblock(fd, nonBlocking)
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if err != nil {
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return fmt.Errorf("setting non block to TUN device file descriptor: %w", err)
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}
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return nil
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}
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