Align with go library layout

1 files changed, 0 insertions, 377 deletions

diff --git a/src/tun_linux.go b/src/tun_linux.go
deleted file mode 100644
index 9756169..0000000
--- a/src/tun_linux.go
+++ /dev/null
@@ -1,377 +0,0 @@
-package main
-
-/* Implementation of the TUN device interface for linux
- */
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"golang.org/x/net/ipv6"
-	"golang.org/x/sys/unix"
-	"net"
-	"os"
-	"strings"
-	"time"
-	"unsafe"
-)
-
-// #include <string.h>
-// #include <unistd.h>
-// #include <net/if.h>
-// #include <netinet/in.h>
-// #include <linux/netlink.h>
-// #include <linux/rtnetlink.h>
-//
-// /* Creates a netlink socket
-//  * listening to the RTMGRP_LINK multicast group
-//  */
-//
-// int bind_rtmgrp() {
-//   int nl_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-//   if (nl_sock < 0)
-//     return -1;
-//
-//	 struct sockaddr_nl addr;
-//   memset ((void *) &addr, 0, sizeof (addr));
-//   addr.nl_family = AF_NETLINK;
-//   addr.nl_pid = getpid ();
-//   addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
-//
-//   if (bind(nl_sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
-//     return -1;
-//
-//   return nl_sock;
-// }
-import "C"
-
-const (
-	CloneDevicePath = "/dev/net/tun"
-	IFReqSize       = unix.IFNAMSIZ + 64
-)
-
-type NativeTun struct {
-	fd     *os.File
-	index  int32         // if index
-	name   string        // name of interface
-	errors chan error    // async error handling
-	events chan TUNEvent // device related events
-}
-
-func (tun *NativeTun) File() *os.File {
-	return tun.fd
-}
-
-func (tun *NativeTun) RoutineHackListener() {
-	/* This is needed for the detection to work across network namespaces
-	 * If you are reading this and know a better method, please get in touch.
-	 */
-	fd := int(tun.fd.Fd())
-	for {
-		_, err := unix.Write(fd, nil)
-		switch err {
-		case unix.EINVAL:
-			tun.events <- TUNEventUp
-		case unix.EIO:
-			tun.events <- TUNEventDown
-		default:
-		}
-		time.Sleep(time.Second / 10)
-	}
-}
-
-func (tun *NativeTun) RoutineNetlinkListener() {
-
-	sock := int(C.bind_rtmgrp())
-	if sock < 0 {
-		tun.errors <- errors.New("Failed to create netlink event listener")
-		return
-	}
-
-	for msg := make([]byte, 1<<16); ; {
-
-		msgn, _, _, _, err := unix.Recvmsg(sock, msg[:], nil, 0)
-		if err != nil {
-			tun.errors <- fmt.Errorf("Failed to receive netlink message: %s", err.Error())
-			return
-		}
-
-		for remain := msg[:msgn]; len(remain) >= unix.SizeofNlMsghdr; {
-
-			hdr := *(*unix.NlMsghdr)(unsafe.Pointer(&remain[0]))
-
-			if int(hdr.Len) > len(remain) {
-				break
-			}
-
-			switch hdr.Type {
-			case unix.NLMSG_DONE:
-				remain = []byte{}
-
-			case unix.RTM_NEWLINK:
-				info := *(*unix.IfInfomsg)(unsafe.Pointer(&remain[unix.SizeofNlMsghdr]))
-				remain = remain[hdr.Len:]
-
-				if info.Index != tun.index {
-					// not our interface
-					continue
-				}
-
-				if info.Flags&unix.IFF_RUNNING != 0 {
-					tun.events <- TUNEventUp
-				}
-
-				if info.Flags&unix.IFF_RUNNING == 0 {
-					tun.events <- TUNEventDown
-				}
-
-				tun.events <- TUNEventMTUUpdate
-
-			default:
-				remain = remain[hdr.Len:]
-			}
-		}
-	}
-}
-
-func (tun *NativeTun) isUp() (bool, error) {
-	inter, err := net.InterfaceByName(tun.name)
-	return inter.Flags&net.FlagUp != 0, err
-}
-
-func (tun *NativeTun) Name() string {
-	return tun.name
-}
-
-func getDummySock() (int, error) {
-	return unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-}
-
-func getIFIndex(name string) (int32, error) {
-	fd, err := getDummySock()
-	if err != nil {
-		return 0, err
-	}
-
-	defer unix.Close(fd)
-
-	var ifr [IFReqSize]byte
-	copy(ifr[:], name)
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(unix.SIOCGIFINDEX),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-
-	if errno != 0 {
-		return 0, errno
-	}
-
-	index := binary.LittleEndian.Uint32(ifr[unix.IFNAMSIZ:])
-	return toInt32(index), nil
-}
-
-func (tun *NativeTun) setMTU(n int) error {
-
-	// open datagram socket
-
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-
-	if err != nil {
-		return err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-
-	var ifr [IFReqSize]byte
-	copy(ifr[:], tun.name)
-	binary.LittleEndian.PutUint32(ifr[16:20], uint32(n))
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(unix.SIOCSIFMTU),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-
-	if errno != 0 {
-		return errors.New("Failed to set MTU of TUN device")
-	}
-
-	return nil
-}
-
-func (tun *NativeTun) MTU() (int, error) {
-
-	// open datagram socket
-
-	fd, err := unix.Socket(
-		unix.AF_INET,
-		unix.SOCK_DGRAM,
-		0,
-	)
-
-	if err != nil {
-		return 0, err
-	}
-
-	defer unix.Close(fd)
-
-	// do ioctl call
-
-	var ifr [IFReqSize]byte
-	copy(ifr[:], tun.name)
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd),
-		uintptr(unix.SIOCGIFMTU),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-	if errno != 0 {
-		return 0, errors.New("Failed to get MTU of TUN device")
-	}
-
-	// convert result to signed 32-bit int
-
-	val := binary.LittleEndian.Uint32(ifr[16:20])
-	if val >= (1 << 31) {
-		return int(toInt32(val)), nil
-	}
-	return int(val), nil
-}
-
-func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
-
-	// reserve space for header
-
-	buff = buff[offset-4:]
-
-	// add packet information header
-
-	buff[0] = 0x00
-	buff[1] = 0x00
-
-	if buff[4] == ipv6.Version<<4 {
-		buff[2] = 0x86
-		buff[3] = 0xdd
-	} else {
-		buff[2] = 0x08
-		buff[3] = 0x00
-	}
-
-	// write
-
-	return tun.fd.Write(buff)
-}
-
-func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
-	select {
-	case err := <-tun.errors:
-		return 0, err
-	default:
-		buff := buff[offset-4:]
-		n, err := tun.fd.Read(buff[:])
-		if n < 4 {
-			return 0, err
-		}
-		return n - 4, err
-	}
-}
-
-func (tun *NativeTun) Events() chan TUNEvent {
-	return tun.events
-}
-
-func (tun *NativeTun) Close() error {
-	return nil
-}
-
-func CreateTUNFromFile(name string, fd *os.File) (TUNDevice, error) {
-	device := &NativeTun{
-		fd:     fd,
-		name:   name,
-		events: make(chan TUNEvent, 5),
-		errors: make(chan error, 5),
-	}
-
-	// start event listener
-
-	var err error
-	device.index, err = getIFIndex(device.name)
-	if err != nil {
-		return nil, err
-	}
-
-	go device.RoutineNetlinkListener()
-	// go device.RoutineHackListener() // cross namespace
-
-	// set default MTU
-
-	return device, device.setMTU(DefaultMTU)
-}
-
-func CreateTUN(name string) (TUNDevice, error) {
-
-	// open clone device
-
-	fd, err := os.OpenFile(CloneDevicePath, os.O_RDWR, 0)
-	if err != nil {
-		return nil, err
-	}
-
-	// create new device
-
-	var ifr [IFReqSize]byte
-	var flags uint16 = unix.IFF_TUN // | unix.IFF_NO_PI
-	nameBytes := []byte(name)
-	if len(nameBytes) >= unix.IFNAMSIZ {
-		return nil, errors.New("Interface name too long")
-	}
-	copy(ifr[:], nameBytes)
-	binary.LittleEndian.PutUint16(ifr[16:], flags)
-
-	_, _, errno := unix.Syscall(
-		unix.SYS_IOCTL,
-		uintptr(fd.Fd()),
-		uintptr(unix.TUNSETIFF),
-		uintptr(unsafe.Pointer(&ifr[0])),
-	)
-	if errno != 0 {
-		return nil, errno
-	}
-
-	// read (new) name of interface
-
-	newName := string(ifr[:])
-	newName = newName[:strings.Index(newName, "\000")]
-	device := &NativeTun{
-		fd:     fd,
-		name:   newName,
-		events: make(chan TUNEvent, 5),
-		errors: make(chan error, 5),
-	}
-
-	// start event listener
-
-	device.index, err = getIFIndex(device.name)
-	if err != nil {
-		return nil, err
-	}
-
-	go device.RoutineNetlinkListener()
-	// go device.RoutineHackListener() // cross namespace
-
-	// set default MTU
-
-	return device, device.setMTU(DefaultMTU)
-}