From 7221933818afc91b76f6b12ead544570d8ff336a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
Date: Fri, 3 Feb 2017 00:05:10 +0100
Subject: ntdll: Implement LdrEnumerateLoadedModules.

---
 dlls/ntdll/loader.c    | 31 +++++++++++++++++++++++++++++
 dlls/ntdll/ntdll.spec  |  2 +-
 dlls/ntdll/tests/rtl.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index cf758505a4c..0b507da9a08 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -1393,6 +1393,37 @@ NTSTATUS WINAPI LdrFindEntryForAddress(const void* addr, PLDR_MODULE* pmod)
     return STATUS_NO_MORE_ENTRIES;
 }
 
+typedef void (WINAPI LDR_ENUM_CALLBACK)(LDR_MODULE*, void*, BOOLEAN*);
+
+/******************************************************************
+ *      LdrEnumerateLoadedModules (NTDLL.@)
+ */
+NTSTATUS WINAPI LdrEnumerateLoadedModules(void *unknown, LDR_ENUM_CALLBACK *callback, void *context)
+{
+    PLIST_ENTRY mark, entry;
+    PLDR_MODULE mod;
+    BOOLEAN stop = FALSE;
+
+    TRACE("(%p, %p, %p)\n", unknown, callback, context);
+
+    if (unknown || !callback)
+        return STATUS_INVALID_PARAMETER;
+
+    RtlEnterCriticalSection( &loader_section );
+
+    mark = &NtCurrentTeb()->Peb->LdrData->InMemoryOrderModuleList;
+    for (entry = mark->Flink; entry != mark; entry = entry->Flink)
+    {
+        mod = CONTAINING_RECORD(entry, LDR_MODULE, InMemoryOrderModuleList);
+        callback(mod, context, &stop);
+        if (stop) break;
+    }
+
+    RtlLeaveCriticalSection( &loader_section );
+
+    return STATUS_SUCCESS;
+}
+
 /******************************************************************
  *		LdrLockLoaderLock  (NTDLL.@)
  *
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index b4269a679fc..66ecb7d0f37 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -62,7 +62,7 @@
 # @ stub LdrDestroyOutOfProcessImage
 @ stdcall LdrDisableThreadCalloutsForDll(long)
 @ stub LdrEnumResources
-# @ stub LdrEnumerateLoadedModules
+@ stdcall LdrEnumerateLoadedModules(ptr ptr ptr)
 # @ stub LdrFindCreateProcessManifest
 @ stdcall LdrFindEntryForAddress(ptr ptr)
 @ stdcall LdrFindResourceDirectory_U(long ptr long ptr)
diff --git a/dlls/ntdll/tests/rtl.c b/dlls/ntdll/tests/rtl.c
index 940c44a05bd..873437e7f4b 100644
--- a/dlls/ntdll/tests/rtl.c
+++ b/dlls/ntdll/tests/rtl.c
@@ -102,6 +102,7 @@ static BOOL      (WINAPI *pRtlIsCriticalSectionLocked)(CRITICAL_SECTION *);
 static BOOL      (WINAPI *pRtlIsCriticalSectionLockedByThread)(CRITICAL_SECTION *);
 static NTSTATUS  (WINAPI *pRtlInitializeCriticalSectionEx)(CRITICAL_SECTION *, ULONG, ULONG);
 static NTSTATUS  (WINAPI *pRtlQueryPackageIdentity)(HANDLE, WCHAR*, SIZE_T*, WCHAR*, SIZE_T*, BOOLEAN*);
+static NTSTATUS  (WINAPI *pLdrEnumerateLoadedModules)(void*, void*, void*);
 
 static HMODULE hkernel32 = 0;
 static BOOL      (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
@@ -156,6 +157,7 @@ static void InitFunctionPtrs(void)
         pRtlIsCriticalSectionLockedByThread = (void *)GetProcAddress(hntdll, "RtlIsCriticalSectionLockedByThread");
         pRtlInitializeCriticalSectionEx = (void *)GetProcAddress(hntdll, "RtlInitializeCriticalSectionEx");
         pRtlQueryPackageIdentity = (void *)GetProcAddress(hntdll, "RtlQueryPackageIdentity");
+        pLdrEnumerateLoadedModules = (void *)GetProcAddress(hntdll, "LdrEnumerateLoadedModules");
     }
     hkernel32 = LoadLibraryA("kernel32.dll");
     ok(hkernel32 != 0, "LoadLibrary failed\n");
@@ -2228,6 +2230,57 @@ done:
     CoUninitialize();
 }
 
+static BOOL enum_abort = FALSE;
+static BOOL ntdll_found = FALSE;
+static int module_count = 0;
+
+void WINAPI ldr_enum_callback(LDR_MODULE *module, void *context, BOOLEAN *stop)
+{
+    static const WCHAR ntdllW[] = {'n','t','d','l','l','.','d','l','l',0};
+    ok(context == (void *)0xdeadbeef, "Expected 0xdeadbeef, got %p\n", context);
+
+    module_count++;
+
+    if (!lstrcmpiW(module->BaseDllName.Buffer, ntdllW))
+        ntdll_found = TRUE;
+
+    *stop = enum_abort;
+}
+
+static void test_LdrEnumerateLoadedModules(void)
+{
+    NTSTATUS status;
+
+    if (!pLdrEnumerateLoadedModules)
+    {
+        win_skip("LdrEnumerateLoadedModules not available\n");
+        return;
+    }
+
+    enum_abort = FALSE;
+    ntdll_found = FALSE;
+    module_count = 0;
+    status = pLdrEnumerateLoadedModules(NULL, ldr_enum_callback, (void *)0xdeadbeef);
+    ok(status == STATUS_SUCCESS, "got wrong status 0x%08x\n", status);
+    ok(ntdll_found, "Could not find ntdll!\n");
+    ok(module_count > 1, "Expected more than one module, got %d\n", module_count);
+
+    enum_abort = TRUE;
+    module_count = 0;
+    status = pLdrEnumerateLoadedModules(NULL, ldr_enum_callback, (void *)0xdeadbeef);
+    ok(status == STATUS_SUCCESS, "got wrong status 0x%08x\n", status);
+    ok(module_count == 1, "Expected exactly one module, got %d\n", module_count);
+
+    status = pLdrEnumerateLoadedModules((void *)0x1, ldr_enum_callback, (void *)0xdeadbeef);
+    ok(status == STATUS_INVALID_PARAMETER, "got wrong status 0x%08x\n", status);
+
+    status = pLdrEnumerateLoadedModules((void *)0xdeadbeef, ldr_enum_callback, (void *)0xdeadbeef);
+    ok(status == STATUS_INVALID_PARAMETER, "got wrong status 0x%08x\n", status);
+
+    status = pLdrEnumerateLoadedModules(NULL, NULL, (void *)0xdeadbeef);
+    ok(status == STATUS_INVALID_PARAMETER, "got wrong status 0x%08x\n", status);
+}
+
 START_TEST(rtl)
 {
     InitFunctionPtrs();
@@ -2261,4 +2314,5 @@ START_TEST(rtl)
     test_RtlInitializeCriticalSectionEx();
     test_RtlLeaveCriticalSection();
     test_RtlQueryPackageIdentity();
+    test_LdrEnumerateLoadedModules();
 }
-- 
2.11.0