Create first test integration for new windows kext

firewall/interception/kexttest/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/Safing/portmaster/firewall/interception/windowskext"
+)
+
+func main() {
+	kext, err := windowskext.New("./WinDivert.dll")
+	if err != nil {
+		panic(err)
+	}
+
+	vR, err := kext.RecvVerdictRequest()
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("verdictRequest: %+v", vR)
+}

firewall/interception/windivert/windivert.go

@@ -205,8 +205,8 @@ func (wd *WinDivert) GetParam(param uintptr) (uint64, error) {
 	var value uint64
 
 	r1, _, lastErr := wd.getParam.Call(
-		wd.handle, // __in        HANDLE handle
+		wd.handle,                       // __in        HANDLE handle
-		param,     // __in        WINDIVERT_PARAM param
+		param,                           // __in        WINDIVERT_PARAM param
 		uintptr(unsafe.Pointer(&value)), // __out       UINT64 *pValue
 	)
 	if r1 == rvFalse {
@@ -220,7 +220,7 @@ func (wd *WinDivert) HelperCalcChecksums(packetData []byte, address *WinDivertAd
 		byteSliceToPtr(packetData),       // __inout     PVOID pPacket
 		uintptr(len(packetData)),         // __in        UINT packetLen
 		uintptr(unsafe.Pointer(address)), // __in_opt    PWINDIVERT_ADDRESS pAddr
-		flags, // __in        UINT64 flags
+		flags,                            // __in        UINT64 flags
 	)
 	if r1 == rvFalse {
 		return lastErr

firewall/interception/windowskext/kext.go

@@ -0,0 +1,62 @@
+package windowskext
+
+import (
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/tevino/abool"
+)
+
+type WinKext struct {
+	dll *windows.DLL
+
+	recvVerdictRequest *windows.Proc
+
+	valid *abool.AtomicBool
+}
+
+type VerdictRequest struct {
+	ID        uint32
+	ProcessID uint32
+	Direction bool
+	IPv6      bool
+	SrcIP     [4]uint32
+	DstIP     [4]uint32
+	SrcPort   uint16
+	DstPort   uint16
+	Protocol  uint8
+}
+
+func New(dllLocation string) (*WinKext, error) {
+
+	new := &WinKext{}
+	var err error
+
+	// load dll
+	new.dll, err = windows.LoadDLL(dllLocation)
+	if err != nil {
+		return nil, err
+	}
+
+	// load functions
+	new.recvVerdictRequest, err = new.dll.FindProc("PortmasterRecvVerdictRequest")
+	if err != nil {
+		return nil, fmt.Errorf("could not find proc PortmasterRecvVerdictRequest: %s", err)
+	}
+
+	return new, nil
+}
+
+func (kext *WinKext) RecvVerdictRequest() (*VerdictRequest, error) {
+	new := &VerdictRequest{}
+
+	rc, _, lastErr := kext.recvVerdictRequest.Call(
+		uintptr(unsafe.Pointer(new)),
+	)
+	if rc != 0 {
+		return nil, lastErr
+	}
+	return new, nil
+}