mirror of
https://github.com/yggdrasil-network/water.git
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6a76f249f6
this makes it possible to get *os.File by using type assertion over ReadWriteCloser. resolves #7
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// +build linux
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package water
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import (
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"os"
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"strings"
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"syscall"
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"unsafe"
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)
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const (
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cIFF_TUN = 0x0001
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cIFF_TAP = 0x0002
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cIFF_NO_PI = 0x1000
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)
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type ifReq struct {
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Name [0x10]byte
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Flags uint16
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pad [0x28 - 0x10 - 2]byte
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}
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func newTAP(ifName string) (ifce *Interface, err error) {
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file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
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if err != nil {
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return nil, err
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}
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name, err := createInterface(file.Fd(), ifName, cIFF_TAP|cIFF_NO_PI)
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if err != nil {
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return nil, err
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}
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ifce = &Interface{isTAP: true, ReadWriteCloser: file, name: name}
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return
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}
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func newTUN(ifName string) (ifce *Interface, err error) {
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file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
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if err != nil {
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return nil, err
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}
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name, err := createInterface(file.Fd(), ifName, cIFF_TUN|cIFF_NO_PI)
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if err != nil {
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return nil, err
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}
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ifce = &Interface{isTAP: false, ReadWriteCloser: file, name: name}
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return
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}
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func createInterface(fd uintptr, ifName string, flags uint16) (createdIFName string, err error) {
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var req ifReq
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req.Flags = flags
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copy(req.Name[:], ifName)
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_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TUNSETIFF), uintptr(unsafe.Pointer(&req)))
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if errno != 0 {
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err = errno
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return
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}
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createdIFName = strings.Trim(string(req.Name[:]), "\x00")
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return
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}
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