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Code Issues Releases Wiki Activity

wintun: do not load dll in init()

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This prevents linking to wintun.dll until it's actually needed, which
should improve startup time.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2020-12-09 01:46:55 +01:00
parent 347ce76bbc
commit ca9edf1c63
5 changed files with 21 additions and 14 deletions
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4
tun/wintun/dll_fromfile_windows.go
View File

@ -20,6 +20,7 @@ type lazyDLL struct {
Name string
mu sync.Mutex
module windows.Handle
onLoad func(d *lazyDLL)
}
func (d *lazyDLL) Load() error {
@ -42,6 +43,9 @@ func (d *lazyDLL) Load() error {
}
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.module)), unsafe.Pointer(module))
if d.onLoad != nil {
d.onLoad(d)
}
return nil
}

4
tun/wintun/dll_fromrsrc_windows.go
View File

@ -23,6 +23,7 @@ type lazyDLL struct {
Name string
mu sync.Mutex
module *memmod.Module
onLoad func(d *lazyDLL)
}
func (d *lazyDLL) Load() error {
@ -50,6 +51,9 @@ func (d *lazyDLL) Load() error {
}
atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&d.module)), unsafe.Pointer(module))
if d.onLoad != nil {
d.onLoad(d)
}
return nil
}

4
tun/wintun/dll_windows.go
View File

@ -12,8 +12,8 @@ import (
"unsafe"
)
func newLazyDLL(name string) *lazyDLL {
return &lazyDLL{Name: name}
func newLazyDLL(name string, onLoad func(d *lazyDLL)) *lazyDLL {
return &lazyDLL{Name: name, onLoad: onLoad}
}
func (d *lazyDLL) NewProc(name string) *lazyProc {

16
tun/wintun/session_windows.go
View File

@ -30,12 +30,12 @@ type Packet struct {
}
var (
procWintunAllocateSendPacket = modwintun.NewProc("WintunAllocateSendPacket").Addr()
procWintunAllocateSendPacket = modwintun.NewProc("WintunAllocateSendPacket")
procWintunEndSession = modwintun.NewProc("WintunEndSession")
procWintunGetReadWaitEvent = modwintun.NewProc("WintunGetReadWaitEvent")
procWintunReceivePacket = modwintun.NewProc("WintunReceivePacket").Addr()
procWintunReleaseReceivePacket = modwintun.NewProc("WintunReleaseReceivePacket").Addr()
procWintunSendPacket = modwintun.NewProc("WintunSendPacket").Addr()
procWintunReceivePacket = modwintun.NewProc("WintunReceivePacket")
procWintunReleaseReceivePacket = modwintun.NewProc("WintunReleaseReceivePacket")
procWintunSendPacket = modwintun.NewProc("WintunSendPacket")
procWintunStartSession = modwintun.NewProc("WintunStartSession")
)
@ -62,7 +62,7 @@ func (session Session) ReadWaitEvent() (handle windows.Handle) {
func (session Session) ReceivePacket() (packet []byte, err error) {
var packetSize uint32
r0, _, e1 := syscall.Syscall(procWintunReceivePacket, 2, session.handle, uintptr(unsafe.Pointer(&packetSize)), 0)
r0, _, e1 := syscall.Syscall(procWintunReceivePacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packetSize)), 0)
if r0 == 0 {
err = e1
return
@ -72,11 +72,11 @@ func (session Session) ReceivePacket() (packet []byte, err error) {
}
func (session Session) ReleaseReceivePacket(packet []byte) {
syscall.Syscall(procWintunReleaseReceivePacket, 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
syscall.Syscall(procWintunReleaseReceivePacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
}
func (session Session) AllocateSendPacket(packetSize int) (packet []byte, err error) {
r0, _, e1 := syscall.Syscall(procWintunAllocateSendPacket, 2, session.handle, uintptr(packetSize), 0)
r0, _, e1 := syscall.Syscall(procWintunAllocateSendPacket.Addr(), 2, session.handle, uintptr(packetSize), 0)
if r0 == 0 {
err = e1
return
@ -86,7 +86,7 @@ func (session Session) AllocateSendPacket(packetSize int) (packet []byte, err er
}
func (session Session) SendPacket(packet []byte) {
syscall.Syscall(procWintunSendPacket, 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
syscall.Syscall(procWintunSendPacket.Addr(), 2, session.handle, uintptr(unsafe.Pointer(&packet[0])), 0)
}
// unsafeSlice updates the slice slicePtr to be a slice

7
tun/wintun/wintun_windows.go
View File

@ -34,7 +34,7 @@ type Adapter struct {
}
var (
modwintun = newLazyDLL("wintun.dll")
modwintun = newLazyDLL("wintun.dll", setupLogger)
procWintunCreateAdapter = modwintun.NewProc("WintunCreateAdapter")
procWintunDeleteAdapter = modwintun.NewProc("WintunDeleteAdapter")
@ -46,11 +46,10 @@ var (
procWintunGetAdapterName = modwintun.NewProc("WintunGetAdapterName")
procWintunGetRunningDriverVersion = modwintun.NewProc("WintunGetRunningDriverVersion")
procWintunSetAdapterName = modwintun.NewProc("WintunSetAdapterName")
procWintunSetLogger = modwintun.NewProc("WintunSetLogger")
)
func init() {
syscall.Syscall(procWintunSetLogger.Addr(), 1, windows.NewCallback(func(level loggerLevel, msg *uint16) int {
func setupLogger(dll *lazyDLL) {
syscall.Syscall(dll.NewProc("WintunSetLogger").Addr(), 1, windows.NewCallback(func(level loggerLevel, msg *uint16) int {
log.Println("[Wintun]", windows.UTF16PtrToString(msg))
return 0
}), 0, 0)