1 files changed, 176 insertions, 0 deletions
diff --git a/xpcom/tests/windows/TestNtPathToDosPath.cpp b/xpcom/tests/windows/TestNtPathToDosPath.cpp
new file mode 100644
index 0000000000..ac29ddac50
--- /dev/null
+++ b/xpcom/tests/windows/TestNtPathToDosPath.cpp
@@ -0,0 +1,176 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+#include <winnetwk.h>
+
+#include "mozilla/FileUtilsWin.h"
+#include "mozilla/DebugOnly.h"
+#include "nsCRTGlue.h"
+
+#include "gtest/gtest.h"
+
+class DriveMapping {
+ public:
+  explicit DriveMapping(const nsAString& aRemoteUNCPath);
+  ~DriveMapping();
+
+  bool Init();
+  bool ChangeDriveLetter();
+  wchar_t GetDriveLetter() { return mDriveLetter; }
+
+ private:
+  bool DoMapping();
+  void Disconnect(wchar_t aDriveLetter);
+
+  wchar_t mDriveLetter;
+  nsString mRemoteUNCPath;
+};
+
+DriveMapping::DriveMapping(const nsAString& aRemoteUNCPath)
+    : mDriveLetter(0), mRemoteUNCPath(aRemoteUNCPath) {}
+
+bool DriveMapping::Init() {
+  if (mDriveLetter) {
+    return false;
+  }
+  return DoMapping();
+}
+
+bool DriveMapping::DoMapping() {
+  wchar_t drvTemplate[] = L" :";
+  NETRESOURCEW netRes = {0};
+  netRes.dwType = RESOURCETYPE_DISK;
+  netRes.lpLocalName = drvTemplate;
+  netRes.lpRemoteName =
+      reinterpret_cast<wchar_t*>(mRemoteUNCPath.BeginWriting());
+  wchar_t driveLetter = L'D';
+  DWORD result = NO_ERROR;
+  do {
+    drvTemplate[0] = driveLetter;
+    result = WNetAddConnection2W(&netRes, nullptr, nullptr, CONNECT_TEMPORARY);
+  } while (result == ERROR_ALREADY_ASSIGNED && ++driveLetter <= L'Z');
+  if (result != NO_ERROR) {
+    return false;
+  }
+  mDriveLetter = driveLetter;
+  return true;
+}
+
+bool DriveMapping::ChangeDriveLetter() {
+  wchar_t prevDriveLetter = mDriveLetter;
+  bool result = DoMapping();
+  MOZ_RELEASE_ASSERT(mDriveLetter != prevDriveLetter);
+  if (result && prevDriveLetter) {
+    Disconnect(prevDriveLetter);
+  }
+  return result;
+}
+
+void DriveMapping::Disconnect(wchar_t aDriveLetter) {
+  wchar_t drvTemplate[] = {aDriveLetter, L':', L'\0'};
+  DWORD result = WNetCancelConnection2W(drvTemplate, 0, TRUE);
+  MOZ_RELEASE_ASSERT(result == NO_ERROR);
+}
+
+DriveMapping::~DriveMapping() {
+  if (mDriveLetter) {
+    Disconnect(mDriveLetter);
+  }
+}
+
+bool DriveToNtPath(const wchar_t aDriveLetter, nsAString& aNtPath) {
+  const wchar_t drvTpl[] = {aDriveLetter, L':', L'\0'};
+  aNtPath.SetLength(MAX_PATH);
+  DWORD pathLen;
+  while (true) {
+    pathLen = QueryDosDeviceW(
+        drvTpl, reinterpret_cast<wchar_t*>(aNtPath.BeginWriting()),
+        aNtPath.Length());
+    if (pathLen || GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+      break;
+    }
+    aNtPath.SetLength(aNtPath.Length() * 2);
+  }
+  if (!pathLen) {
+    return false;
+  }
+  // aNtPath contains embedded NULLs, so we need to figure out the real length
+  // via wcslen.
+  aNtPath.SetLength(NS_strlen(aNtPath.BeginReading()));
+  return true;
+}
+
+bool TestNtPathToDosPath(const wchar_t* aNtPath,
+                         const wchar_t* aExpectedDosPath) {
+  nsAutoString output;
+  bool result = mozilla::NtPathToDosPath(nsDependentString(aNtPath), output);
+  return result && output == reinterpret_cast<const nsAString::char_type*>(
+                                 aExpectedDosPath);
+}
+
+TEST(NtPathToDosPath, Tests)
+{
+  nsAutoString cDrive;
+  ASSERT_TRUE(DriveToNtPath(L'C', cDrive));
+
+  // empty string
+  EXPECT_TRUE(TestNtPathToDosPath(L"", L""));
+
+  // non-existent device, must fail
+  EXPECT_FALSE(
+      TestNtPathToDosPath(L"\\Device\\ThisDeviceDoesNotExist\\Foo", nullptr));
+
+  // base case
+  nsAutoString testPath(cDrive);
+  testPath.Append(L"\\Program Files");
+  EXPECT_TRUE(TestNtPathToDosPath(testPath.get(), L"C:\\Program Files"));
+
+  // short filename
+  nsAutoString ntShortName(cDrive);
+  ntShortName.Append(L"\\progra~1");
+  EXPECT_TRUE(TestNtPathToDosPath(ntShortName.get(), L"C:\\Program Files"));
+
+  // drive letters as symbolic links (NtCreateFile uses these)
+  EXPECT_TRUE(TestNtPathToDosPath(L"\\??\\C:\\Foo", L"C:\\Foo"));
+
+  // other symbolic links (should fail)
+  EXPECT_FALSE(TestNtPathToDosPath(L"\\??\\MountPointManager", nullptr));
+
+  // socket (should fail)
+  EXPECT_FALSE(TestNtPathToDosPath(L"\\Device\\Afd\\Endpoint", nullptr));
+
+  // UNC path (using MUP)
+  EXPECT_TRUE(TestNtPathToDosPath(L"\\Device\\Mup\\127.0.0.1\\C$",
+                                  L"\\\\127.0.0.1\\C$"));
+
+  // UNC path (using LanmanRedirector)
+  EXPECT_TRUE(TestNtPathToDosPath(L"\\Device\\LanmanRedirector\\127.0.0.1\\C$",
+                                  L"\\\\127.0.0.1\\C$"));
+
+  DriveMapping drvMapping(u"\\\\127.0.0.1\\C$"_ns);
+  // Only run these tests if we were able to map; some machines don't have perms
+  if (drvMapping.Init()) {
+    wchar_t expected[] = L" :\\";
+    expected[0] = drvMapping.GetDriveLetter();
+    nsAutoString networkPath;
+    ASSERT_TRUE(DriveToNtPath(drvMapping.GetDriveLetter(), networkPath));
+
+    networkPath += u"\\";
+    EXPECT_TRUE(TestNtPathToDosPath(networkPath.get(), expected));
+
+    // NtPathToDosPath must correctly handle paths whose drive letter mapping
+    // has changed. We need to test this because the APIs called by
+    // NtPathToDosPath return different info if this has happened.
+    ASSERT_TRUE(drvMapping.ChangeDriveLetter());
+
+    expected[0] = drvMapping.GetDriveLetter();
+    ASSERT_TRUE(DriveToNtPath(drvMapping.GetDriveLetter(), networkPath));
+
+    networkPath += u"\\";
+    EXPECT_TRUE(TestNtPathToDosPath(networkPath.get(), expected));
+  }
+}