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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package driver
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
)
type AdapterState uint32
const (
AdapterStateDown AdapterState = 0
AdapterStateUp AdapterState = 1
)
type AllowedIP struct {
Address [16]byte
AddressFamily winipcfg.AddressFamily
Cidr uint8
_ [4]byte
}
type PeerFlag uint32
const (
PeerHasPublicKey PeerFlag = 1 << 0
PeerHasPresharedKey PeerFlag = 1 << 1
PeerHasPersistentKeepalive PeerFlag = 1 << 2
PeerHasEndpoint PeerFlag = 1 << 3
PeerReplaceAllowedIPs PeerFlag = 1 << 5
PeerRemove PeerFlag = 1 << 6
PeerUpdateOnly PeerFlag = 1 << 7
)
type Peer struct {
Flags PeerFlag
_ uint32
PublicKey [32]byte
PresharedKey [32]byte
PersistentKeepalive uint16
_ uint16
Endpoint winipcfg.RawSockaddrInet
TxBytes uint64
RxBytes uint64
LastHandshake uint64
AllowedIPsCount uint32
_ [4]byte
}
type InterfaceFlag uint32
const (
InterfaceHasPublicKey InterfaceFlag = 1 << 0
InterfaceHasPrivateKey InterfaceFlag = 1 << 1
InterfaceHasListenPort InterfaceFlag = 1 << 2
InterfaceReplacePeers InterfaceFlag = 1 << 3
)
type Interface struct {
Flags InterfaceFlag
ListenPort uint16
PrivateKey [32]byte
PublicKey [32]byte
PeerCount uint32
_ [4]byte
}
var (
procWireGuardSetAdapterState = modwireguard.NewProc("WireGuardSetAdapterState")
procWireGuardGetAdapterState = modwireguard.NewProc("WireGuardGetAdapterState")
procWireGuardSetConfiguration = modwireguard.NewProc("WireGuardSetConfiguration")
procWireGuardGetConfiguration = modwireguard.NewProc("WireGuardGetConfiguration")
)
// SetAdapterState sets the adapter either Up or Down.
func (wireguard *Adapter) SetAdapterState(adapterState AdapterState) (err error) {
r0, _, e1 := syscall.SyscallN(procWireGuardSetAdapterState.Addr(), wireguard.handle, uintptr(adapterState))
if r0 == 0 {
err = e1
}
return
}
// AdapterState returns the current state of the adapter.
func (wireguard *Adapter) AdapterState() (adapterState AdapterState, err error) {
r0, _, e1 := syscall.SyscallN(procWireGuardGetAdapterState.Addr(), wireguard.handle, uintptr(unsafe.Pointer(&adapterState)))
if r0 == 0 {
err = e1
}
return
}
// SetConfiguration sets the adapter configuration.
func (wireguard *Adapter) SetConfiguration(interfaze *Interface, size uint32) (err error) {
r0, _, e1 := syscall.SyscallN(procWireGuardSetConfiguration.Addr(), wireguard.handle, uintptr(unsafe.Pointer(interfaze)), uintptr(size))
if r0 == 0 {
err = e1
}
return
}
// Configuration gets the adapter configuration.
func (wireguard *Adapter) Configuration() (interfaze *Interface, err error) {
size := wireguard.lastGetGuessSize
if size == 0 {
size = 512
}
for {
buf := make([]byte, size)
r0, _, e1 := syscall.SyscallN(procWireGuardGetConfiguration.Addr(), wireguard.handle, uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&size)))
if r0 != 0 {
wireguard.lastGetGuessSize = size
return (*Interface)(unsafe.Pointer(&buf[0])), nil
}
if e1 != windows.ERROR_MORE_DATA {
return nil, e1
}
}
}
// FirstPeer returns the first peer attached to the interface.
func (interfaze *Interface) FirstPeer() *Peer {
return (*Peer)(unsafe.Add(unsafe.Pointer(interfaze), unsafe.Sizeof(*interfaze)))
}
// NextPeer returns the subsequent peer of the current one.
func (peer *Peer) NextPeer() *Peer {
return (*Peer)(unsafe.Pointer(uintptr(unsafe.Pointer(peer)) + unsafe.Sizeof(*peer) + uintptr(peer.AllowedIPsCount)*unsafe.Sizeof(AllowedIP{})))
}
// FirstAllowedIP returns the first allowed IP attached to the peer.
func (peer *Peer) FirstAllowedIP() *AllowedIP {
return (*AllowedIP)(unsafe.Add(unsafe.Pointer(peer), unsafe.Sizeof(*peer)))
}
// NextAllowedIP returns the subsequent allowed IP of the current one.
func (allowedIP *AllowedIP) NextAllowedIP() *AllowedIP {
return (*AllowedIP)(unsafe.Add(unsafe.Pointer(allowedIP), unsafe.Sizeof(*allowedIP)))
}
type ConfigBuilder struct {
buffer []byte
}
// Preallocate reserves memory in the config builder to reduce allocations of append operations.
func (builder *ConfigBuilder) Preallocate(size uint32) {
if builder.buffer == nil {
builder.buffer = make([]byte, 0, size)
}
}
// AppendInterface appends an interface to the building configuration. This should be called first.
func (builder *ConfigBuilder) AppendInterface(interfaze *Interface) {
newBytes := unsafe.Slice((*byte)(unsafe.Pointer(interfaze)), unsafe.Sizeof(*interfaze))
builder.buffer = append(builder.buffer, newBytes...)
}
// AppendPeer appends a peer to the building configuration. This should be called after an interface has been added.
func (builder *ConfigBuilder) AppendPeer(peer *Peer) {
newBytes := unsafe.Slice((*byte)(unsafe.Pointer(peer)), unsafe.Sizeof(*peer))
builder.buffer = append(builder.buffer, newBytes...)
}
// AppendAllowedIP appends an allowed IP to the building configuration. This should be called after a peer has been added.
func (builder *ConfigBuilder) AppendAllowedIP(allowedIP *AllowedIP) {
newBytes := unsafe.Slice((*byte)(unsafe.Pointer(allowedIP)), unsafe.Sizeof(*allowedIP))
builder.buffer = append(builder.buffer, newBytes...)
}
// Interface assembles the configuration and returns the interface and length to be passed to SetConfiguration.
func (builder *ConfigBuilder) Interface() (*Interface, uint32) {
if builder.buffer == nil {
return nil, 0
}
return (*Interface)(unsafe.Pointer(&builder.buffer[0])), uint32(len(builder.buffer))
}
|
