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memmod: fix import loading function usage

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2020-11-27 13:13:45 +01:00
parent c9fabbd5bf
commit b6303091fc
5 changed files with 10 additions and 32 deletions
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22
tun/wintun/memmod/zsyscall_windows.go
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@ -40,31 +40,11 @@ func errnoErr(e syscall.Errno) error {
var (
modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
procGetProcAddress = modkernel32.NewProc("GetProcAddress")
procIsBadReadPtr = modkernel32.NewProc("IsBadReadPtr")
procLoadLibraryA = modkernel32.NewProc("LoadLibraryA")
procIsBadReadPtr = modkernel32.NewProc("IsBadReadPtr")
)
func getProcAddress(module windows.Handle, procName *byte) (addr uintptr, err error) {
r0, _, e1 := syscall.Syscall(procGetProcAddress.Addr(), 2, uintptr(module), uintptr(unsafe.Pointer(procName)), 0)
addr = uintptr(r0)
if addr == 0 {
err = errnoErr(e1)
}
return
}
func isBadReadPtr(addr uintptr, ucb uintptr) (ret bool) {
r0, _, _ := syscall.Syscall(procIsBadReadPtr.Addr(), 2, uintptr(addr), uintptr(ucb), 0)
ret = r0 != 0
return
}
func loadLibraryA(libFileName *byte) (module windows.Handle, err error) {
r0, _, e1 := syscall.Syscall(procLoadLibraryA.Addr(), 1, uintptr(unsafe.Pointer(libFileName)), 0, 0)
module = windows.Handle(r0)
if module == 0 {
err = errnoErr(e1)
}
return
}