124 lines
2.4 KiB
Go
124 lines
2.4 KiB
Go
// +build !linux
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// udp_generic implements the nebula UDP interface in pure Go stdlib. This
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// means it can be used on platforms like Darwin and Windows.
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package nebula
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import (
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"context"
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"encoding/binary"
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"fmt"
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"net"
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"strconv"
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"strings"
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)
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type udpAddr struct {
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net.UDPAddr
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}
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type udpConn struct {
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*net.UDPConn
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}
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func NewUDPAddr(ip uint32, port uint16) *udpAddr {
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return &udpAddr{
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UDPAddr: net.UDPAddr{
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IP: int2ip(ip),
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Port: int(port),
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},
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}
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}
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func NewUDPAddrFromString(s string) *udpAddr {
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p := strings.Split(s, ":")
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if len(p) < 2 {
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return nil
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}
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port, _ := strconv.Atoi(p[1])
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return &udpAddr{
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UDPAddr: net.UDPAddr{
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IP: net.ParseIP(p[0]),
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Port: port,
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},
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}
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}
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func NewListener(ip string, port int, multi bool) (*udpConn, error) {
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lc := NewListenConfig(multi)
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pc, err := lc.ListenPacket(context.TODO(), "udp4", fmt.Sprintf("%s:%d", ip, port))
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if err != nil {
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return nil, err
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}
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if uc, ok := pc.(*net.UDPConn); ok {
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return &udpConn{UDPConn: uc}, nil
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}
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return nil, fmt.Errorf("Unexpected PacketConn: %T %#v", pc, pc)
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}
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func (ua *udpAddr) Equals(t *udpAddr) bool {
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if t == nil || ua == nil {
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return t == nil && ua == nil
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}
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return ua.IP.Equal(t.IP) && ua.Port == t.Port
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}
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func (uc *udpConn) WriteTo(b []byte, addr *udpAddr) error {
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_, err := uc.UDPConn.WriteToUDP(b, &addr.UDPAddr)
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return err
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}
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func (uc *udpConn) LocalAddr() (*udpAddr, error) {
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a := uc.UDPConn.LocalAddr()
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switch v := a.(type) {
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case *net.UDPAddr:
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return &udpAddr{UDPAddr: *v}, nil
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default:
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return nil, fmt.Errorf("LocalAddr returned: %#v", a)
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}
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}
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func (u *udpConn) reloadConfig(c *Config) {
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// TODO
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}
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type rawMessage struct {
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Len uint32
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}
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func (u *udpConn) ListenOut(f *Interface) {
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plaintext := make([]byte, mtu)
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buffer := make([]byte, mtu)
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header := &Header{}
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fwPacket := &FirewallPacket{}
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udpAddr := &udpAddr{}
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nb := make([]byte, 12, 12)
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for {
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// Just read one packet at a time
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n, rua, err := u.ReadFromUDP(buffer)
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if err != nil {
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l.WithError(err).Error("Failed to read packets")
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continue
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}
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udpAddr.UDPAddr = *rua
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f.readOutsidePackets(udpAddr, plaintext[:0], buffer[:n], header, fwPacket, nb)
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}
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}
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func udp2ip(addr *udpAddr) net.IP {
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return addr.IP
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}
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func udp2ipInt(addr *udpAddr) uint32 {
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return binary.BigEndian.Uint32(addr.IP.To4())
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}
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func hostDidRoam(addr *udpAddr, newaddr *udpAddr) bool {
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return !addr.Equals(newaddr)
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}
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