error.go

package windivert

import (
	"fmt"
	"syscall"

	"golang.org/x/sys/windows"
)

type Error syscall.Errno

const (
	ErrInsufficientBuffer = Error(windows.ERROR_INSUFFICIENT_BUFFER)
	ErrNoData             = Error(windows.ERROR_NO_DATA)
	ErrIOPending          = Error(windows.ERROR_IO_PENDING)
	ErrHostUnreachable    = Error(windows.ERROR_HOST_UNREACHABLE)
)

func (e Error) Error() string {
	switch syscall.Errno(e) {
	case windows.ERROR_FILE_NOT_FOUND:
		return "The driver files WinDivert32.sys or WinDivert64.sys were not found"
	case windows.ERROR_ACCESS_DENIED:
		return "The calling application does not have Administrator privileges"
	case windows.ERROR_INVALID_PARAMETER:
		return "This indicates an invalid packet filter string, layer, priority, or flags"
	case windows.ERROR_INVALID_IMAGE_HASH:
		return "The WinDivert32.sys or WinDivert64.sys driver does not have a valid digital signature (see the driver signing requirements above)"
	case windows.ERROR_DRIVER_FAILED_PRIOR_UNLOAD:
		return "An incompatible version of the WinDivert driver is currently loaded"
	case windows.ERROR_SERVICE_DOES_NOT_EXIST:
		return "The handle was opened with the WINDIVERT_FLAG_NO_INSTALL flag and the WinDivert driver is not already installed"
	case windows.ERROR_DRIVER_BLOCKED:
		return "This error occurs for various reasons, including: the WinDivert driver is blocked by security software; or you are using a virtualization environment that does not support drivers"
	case windows.ERROR_INSUFFICIENT_BUFFER:
		return "The captured packet is larger than the pPacket buffer"
	case windows.ERROR_NO_DATA:
		return "The handle has been shutdown using WinDivertShutdown() and the packet queue is empty"
	case windows.ERROR_IO_PENDING:
		return "The error code ERROR_IO_PENDING indicates that the overlapped operation has been successfully initiated and that completion will be indicated at a later time"
	case windows.ERROR_HOST_UNREACHABLE:
		return "This error occurs when an impostor packet (with pAddr->Impostor set to 1) is injected and the ip.TTL or ipv6.HopLimit field goes to zero. This is a defense of \"last resort\" against infinite loops caused by impostor packets"
	case windows.EPT_S_NOT_REGISTERED:
		return "This error occurs when the Base Filtering Engine service has been disabled"
	default:
		return fmt.Sprintf("windivert error: %v", syscall.Errno(e))
	}
}