private void TestNativeDetoursUnix(dt_rand d_not_rand, IntPtr ptr_not_rand)
{
DidNothing = true;
libc_rand();
Assert.True(DidNothing);
DidNothing = true;
Assert.Equal(-1, d_not_rand());
Assert.False(DidNothing);
using (new NativeDetour(
typeof(NativeDetourTest).GetMethod("libc_rand"),
typeof(NativeDetourTest).GetMethod("not_rand")
)) {
DidNothing = true;
Assert.Equal(-1, libc_rand());
Assert.False(DidNothing);
}
DidNothing = true;
libc_rand();
Assert.True(DidNothing);
/* dl's dlopen doesn't follow ld, meaning that we need to...
* - use libc.so.6 on Linux and hope that everyone is using glibc.
* - use /usr/lib/libc.dylib on macOS because macOS is macOS.
* If libc cannot be dlopened, skip the native -> managed detour test.
* - ade
*/
if (!(PlatformHelper.Is(Platform.Linux) && DynDll.TryOpenLibrary("libc.so.6", out IntPtr libc)) &&
!(PlatformHelper.Is(Platform.MacOS) && DynDll.TryOpenLibrary("/usr/lib/libc.dylib", out libc)) &&
!DynDll.TryOpenLibrary($"libc.{PlatformHelper.LibrarySuffix}", out libc))
{
return;
}
NativeDetour d = new NativeDetour(
libc.GetFunction("rand"),
ptr_not_rand
);
DidNothing = true;
Assert.Equal(-1, libc_rand());
Assert.False(DidNothing);
d.Dispose();
DidNothing = true;
libc_rand();
Assert.True(DidNothing);
}
private void TestNativeDetoursWindows(dt_rand d_not_rand, IntPtr ptr_not_rand)
{
if (!DynDll.TryOpenLibrary($"msvcrt.{PlatformHelper.LibrarySuffix}", out IntPtr msvcrt))
{
Console.WriteLine("NativeDetourTest skipped - msvcrt not found!");
return;
}
if (!msvcrt.TryGetFunction("rand", out IntPtr ptr_msvcrt_rand))
{
Console.WriteLine("NativeDetourTest skipped - rand not found in msvcrt!");
return;
}
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
DidNothing = true;
Assert.Equal(-1, d_not_rand());
Assert.False(DidNothing);
using (new NativeDetour(
typeof(NativeDetourTest).GetMethod("msvcrt_rand"),
typeof(NativeDetourTest).GetMethod("not_rand")
)) {
DidNothing = true;
Assert.Equal(-1, msvcrt_rand());
Assert.False(DidNothing);
}
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
NativeDetour d = new NativeDetour(
ptr_msvcrt_rand,
ptr_not_rand
);
DidNothing = true;
Assert.Equal(-1, msvcrt_rand());
Assert.False(DidNothing);
d.Dispose();
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
}
private void TestNativeDetoursWindows(dt_rand d_not_rand, IntPtr ptr_not_rand)
{
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
DidNothing = true;
Assert.Equal(-1, d_not_rand());
Assert.False(DidNothing);
using (new NativeDetour(
typeof(NativeDetourTest).GetMethod("msvcrt_rand"),
typeof(NativeDetourTest).GetMethod("not_rand")
)) {
DidNothing = true;
Assert.Equal(-1, msvcrt_rand());
Assert.False(DidNothing);
}
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
NativeDetour d = new NativeDetour(
DynDll.OpenLibrary($"msvcrt.{PlatformHelper.LibrarySuffix}").GetFunction("rand"),
ptr_not_rand
);
DidNothing = true;
Assert.Equal(-1, msvcrt_rand());
Assert.False(DidNothing);
d.Dispose();
DidNothing = true;
msvcrt_rand();
Assert.True(DidNothing);
}
public void TestNativeDetours()
{
// https://github.com/dotnet/coreclr/pull/8263
dt_rand d_not_rand = not_rand;
GCHandle gch_not_rand = GCHandle.Alloc(d_not_rand);
IntPtr ptr_not_rand = Marshal.GetFunctionPointerForDelegate(d_not_rand);
try {
if (PlatformHelper.Is(Platform.Windows))
{
TestNativeDetoursWindows(d_not_rand, ptr_not_rand);
}
else if (PlatformHelper.Is(Platform.Unix))
{
TestNativeDetoursUnix(d_not_rand, ptr_not_rand);
}
else
{
throw new PlatformNotSupportedException();
}
} finally {
gch_not_rand.Free();
}
}
