4 files changed, 440 insertions, 16 deletions
diff --git a/chrome/installer/gcapi/gcapi.cc b/chrome/installer/gcapi/gcapi.cc
index 79382c9..41e5d11 100755
--- a/chrome/installer/gcapi/gcapi.cc
+++ b/chrome/installer/gcapi/gcapi.cc
@@ -5,22 +5,340 @@
 #include "chrome/installer/gcapi/gcapi.h"
 
 #include <windows.h>
+#include <stdlib.h>
+#include <strsafe.h>
 
+namespace {
+
+const wchar_t kChromeRegKey[] = L"Software\\Google\\Update\\Clients\\{8A69D345-D564-463c-AFF1-A69D9E530F96}";
+const wchar_t kChromeRegLaunchCmd[] = L"InstallerSuccessLaunchCmdLine";
+const wchar_t kChromeRegLastLaunchCmd[] = L"LastInstallerSuccessLaunchCmdLine";
+const wchar_t kChromeRegVersion[] = L"pv";
+const wchar_t kNoChromeOfferUntil[] = L"SOFTWARE\\Google\\No Chrome Offer Until";
+
+// Remove any registry key with non-numeric value or with the numeric value
+// equal or less than today's date represented in YYYYMMDD form.
+void CleanUpRegistryValues() {
+  HKEY key = NULL;
+  if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, kNoChromeOfferUntil,
+      0, KEY_ALL_ACCESS, &key) != ERROR_SUCCESS)
+    return;
+
+  DWORD index = 0;
+  wchar_t value_name[260];
+  DWORD value_name_len = _countof(value_name);
+  DWORD value_type = REG_DWORD;
+  DWORD value_data = 0;
+  DWORD value_len = sizeof(DWORD);
+
+  // First, remove any value whose type is not DWORD
+  index = 0;
+  value_len = 0;
+  while (RegEnumValue(key, index, value_name, &value_name_len,
+      NULL, &value_type, NULL, &value_len) == ERROR_SUCCESS) {
+    if (value_type == REG_DWORD)
+      index++;
+    else
+      RegDeleteValue(key, value_name);
+
+    value_name_len = _countof(value_name);
+    value_type = REG_DWORD;
+    value_len = sizeof(DWORD);
+  }
+
+  // Get today's date, and format it as YYYYMMDD numeric value
+  SYSTEMTIME now;
+  GetLocalTime(&now);
+  DWORD expiration_date = now.wYear * 10000 + now.wMonth * 100 + now.wDay;
+
+  // Remove any DWORD value smaller than the number represent the
+  // expiration date (YYYYMMDD)
+  index = 0;
+  while (RegEnumValue(key, index, value_name, &value_name_len,
+      NULL, &value_type, (LPBYTE) &value_data, &value_len) == ERROR_SUCCESS) {
+    if (value_type == REG_DWORD && value_data > expiration_date)
+      index++;  // move on to next value
+    else
+      RegDeleteValue(key, value_name);  // delete this value
+
+    value_name_len = _countof(value_name);
+    value_type = REG_DWORD;
+    value_data = 0;
+    value_len = sizeof(DWORD);
+  }
+
+  RegCloseKey(key);
+}
+
+// Return the company name specified in the file version info resource.
+bool GetCompanyName(const wchar_t* filename, wchar_t* buffer, DWORD out_len) {
+  wchar_t file_version_info[8192];
+  DWORD handle = 0;
+  DWORD buffer_size = 0;
+
+  buffer_size = GetFileVersionInfoSize(filename, &handle);
+  // Cannot stats the file or our buffer size is too small (very unlikely)
+  if (buffer_size == 0 || buffer_size > _countof(file_version_info))
+    return false;
+
+  buffer_size = _countof(file_version_info);
+  memset(file_version_info, 0, buffer_size);
+  if (!GetFileVersionInfo(filename, handle, buffer_size, file_version_info))
+    return false;
+
+  DWORD data_len = 0;
+  LPVOID data = NULL;
+  // Retrieve the language and codepage code if exists.
+  buffer_size = 0;
+  if (!VerQueryValue(file_version_info, TEXT("\\VarFileInfo\\Translation"),
+      reinterpret_cast<LPVOID *>(&data), reinterpret_cast<UINT *>(&data_len)))
+    return false;
+  if (data_len != 4)
+    return false;
+
+  wchar_t info_name[256];
+  DWORD lang = 0;
+  // Formulate the string to retrieve the company name of the specific
+  // language codepage.
+  memcpy(&lang, data, 4);
+  ::StringCchPrintf(info_name, _countof(info_name),
+      L"\\StringFileInfo\\%02X%02X%02X%02X\\CompanyName",
+      (lang & 0xff00)>>8, (lang & 0xff), (lang & 0xff000000)>>24,
+      (lang & 0xff0000)>>16);
+
+  data_len = 0;
+  if (!VerQueryValue(file_version_info, info_name,
+      reinterpret_cast<LPVOID *>(&data), reinterpret_cast<UINT *>(&data_len)))
+    return false;
+  if (data_len <= 0 || data_len >= out_len)
+    return false;
+
+  memset(buffer, 0, out_len);
+  ::StringCchCopyN(buffer, out_len, (const wchar_t*)data, data_len);
+  return true;
+}
+
+// Return true if we can re-offer Chrome; false, otherwise.
+// Each partner can only offer Chrome once every six months.
+bool CanReOfferChrome() {
+  wchar_t filename[MAX_PATH+1];
+  wchar_t company[MAX_PATH];
+
+  // If we cannot retrieve the version info of the executable or company
+  // name, we allow the Chrome to be offered because there is no past
+  // history to be found.
+  if (GetModuleFileName(NULL, filename, MAX_PATH) == 0)
+    return true;
+  if (!GetCompanyName(filename, company, sizeof(company)))
+    return true;
+
+  bool can_re_offer = true;
+  DWORD disposition = 0;
+  HKEY key = NULL;
+  if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, kNoChromeOfferUntil,
+      0, NULL, REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE,
+      NULL, &key, &disposition) == ERROR_SUCCESS) {
+    // Cannot re-offer, if the timer already exists and is not expired yet
+    if (RegQueryValueEx(key, company, 0, 0, 0, 0) == ERROR_SUCCESS) {
+      // The expired timers were already removed in CleanUpRegistryValues.
+      // So if the key is not found, we can offer the Chrome.
+      can_re_offer = false;
+    } else {
+      // Set expiration date for offer as six months from today,
+      // represented as a YYYYMMDD numeric value
+      SYSTEMTIME timer;
+      GetLocalTime(&timer);
+      timer.wMonth = timer.wMonth + 6;
+      if (timer.wMonth > 12) {
+        timer.wMonth = timer.wMonth - 12;
+        timer.wYear = timer.wYear + 1;
+      }
+      DWORD value = timer.wYear * 10000 + timer.wMonth * 100 + timer.wDay;
+      RegSetValueEx(key, company, 0, REG_DWORD, (LPBYTE)&value, sizeof(DWORD));
+    }
+
+    RegCloseKey(key);
+  }
+
+  return can_re_offer;
+}
+
+// Helper function to read a value from registry. Returns true if value
+// is read successfully and stored in parameter value. Returns false otherwise.
+bool ReadValueFromRegistry(HKEY root_key, const wchar_t *sub_key,
+                           const wchar_t *value_name, wchar_t *value,
+                           size_t *size) {
+  HKEY key;
+  if ((::RegOpenKeyEx(root_key, sub_key, NULL,
+                      KEY_READ, &key) == ERROR_SUCCESS) &&
+      (::RegQueryValueEx(key, value_name, NULL, NULL,
+                         reinterpret_cast<LPBYTE>(value),
+                         reinterpret_cast<LPDWORD>(size)) == ERROR_SUCCESS)) {
+    ::RegCloseKey(key);
+    return true;
+  }
+  return false;
+}
+
+bool IsChromeInstalled(HKEY root_key) {
+  wchar_t version[64];
+  size_t size = _countof(version);
+  if (ReadValueFromRegistry(root_key, kChromeRegKey, kChromeRegVersion,
+                            version, &size))
+    return true;
+  return false;
+}
+
+bool IsWinXPSp1OrLater(bool* is_vista_or_later) {
+  OSVERSIONINFOEX osviex = { sizeof(OSVERSIONINFOEX) };
+  int r = ::GetVersionEx((LPOSVERSIONINFO)&osviex);
+  // If this failed we're on Win9X or a pre NT4SP6 OS
+  if (!r)
+    return false;
+
+  if (osviex.dwMajorVersion < 5)
+    return false;
+
+  if (osviex.dwMajorVersion > 5) {
+    *is_vista_or_later = true;
+    return true;    // way beyond Windows XP;
+  }
+
+  if (osviex.dwMinorVersion >= 1 && osviex.wServicePackMajor >= 1)
+    return true;    // Windows XP SP1 or better
+
+  return false;     // Windows 2000, WinXP no Service Pack
+}
+
+bool VerifyAdminGroup() {
+  typedef BOOL (WINAPI *ALLOCATEANDINITIALIZESIDPROC)(
+      PSID_IDENTIFIER_AUTHORITY pIdentifierAuthority, BYTE nSubAuthorityCount,
+      DWORD nSubAuthority0, DWORD nSubAuthority1, DWORD nSubAuthority2,
+      DWORD nSubAuthority3, DWORD nSubAuthority4, DWORD nSubAuthority5,
+      DWORD nSubAuthority6, DWORD nSubAuthority7, PSID *pSid);
+  typedef BOOL (WINAPI *CHECKTOKENMEMBERSHIPPROC)(HANDLE TokenHandle,
+                                                  PSID SidToCheck,
+                                                  PBOOL IsMember);
+  typedef PVOID (WINAPI *FREESIDPROC)(PSID pSid);
+  // Load our admin-checking functions dynamically.
+  HMODULE advapi_library = LoadLibrary(L"advapi32.dll");
+  if (advapi_library != NULL)
+    return false;
+
+  ALLOCATEANDINITIALIZESIDPROC allocSid =
+      reinterpret_cast<ALLOCATEANDINITIALIZESIDPROC>(GetProcAddress(
+      advapi_library, "AllocateAndInitializeSid"));
+  CHECKTOKENMEMBERSHIPPROC checkToken =
+      reinterpret_cast<CHECKTOKENMEMBERSHIPPROC>(GetProcAddress(
+      advapi_library, "CheckTokenMembership"));
+  FREESIDPROC freeSid =
+      reinterpret_cast<FREESIDPROC>(GetProcAddress(
+      advapi_library, "FreeSid"));
+  bool result = false;
+  if (allocSid != NULL && checkToken != NULL && freeSid != NULL) {
+    SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
+    PSID Group;
+    BOOL check = allocSid(&NtAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID,
+                          DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &Group); 
+    if (check) {
+      if (!checkToken(NULL, Group, &check))
+        check = FALSE;
+      freeSid(Group); 
+    }
+    result = !!check;
+  }
+  FreeLibrary(advapi_library);
+  return result;
+}
+
+bool VerifyHKLMAccess(const wchar_t* sub_key) {
+  HKEY root = HKEY_LOCAL_MACHINE;
+  wchar_t str[] = L"test";
+  bool result = false;
+  DWORD disposition = 0;
+  HKEY key = NULL;
+
+  if (RegCreateKeyEx(root, sub_key, 0, NULL,
+                     REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE, NULL,
+                     &key, &disposition) == ERROR_SUCCESS) {
+    if (RegSetValueEx(key, str, 0, REG_SZ, (LPBYTE)str,
+        (DWORD)lstrlen(str)) == ERROR_SUCCESS) {
+      result = true;
+      RegDeleteValue(key, str);
+    }
+
+    //  If we create the main key, delete the entire key.
+    if (disposition == REG_CREATED_NEW_KEY)
+      RegDeleteKey(key, NULL);
+
+    RegCloseKey(key);
+  }
+
+  return result;
+}
+}  // namespace
+
+#pragma comment(linker, "/EXPORT:GoogleChromeCompatibilityCheck=_GoogleChromeCompatibilityCheck@4,PRIVATE")
 DLLEXPORT BOOL __stdcall GoogleChromeCompatibilityCheck(DWORD *reasons) {
-  BOOL result = TRUE;
   DWORD local_reasons = 0;
 
-  // TODO(rahulk): Add all the checks we need before offering Google Chrome as
-  // part of bundle downloads.
+  bool is_vista_or_later = false;
+  // System requirements?
+  if (!IsWinXPSp1OrLater(&is_vista_or_later))
+    local_reasons |= GCCC_ERROR_OSNOTSUPPORTED;
+
+  if (IsChromeInstalled(HKEY_LOCAL_MACHINE))
+    local_reasons |= GCCC_ERROR_SYSTEMLEVELALREADYPRESENT;
 
-  // OS requirements
+  if (IsChromeInstalled(HKEY_CURRENT_USER))
+    local_reasons |= GCCC_ERROR_USERLEVELALREADYPRESENT;
 
-  // Check if it is already installed?
+  if (!VerifyHKLMAccess(kChromeRegKey)) {
+    local_reasons |= GCCC_ERROR_ACCESSDENIED;
+  } else if (is_vista_or_later && !VerifyAdminGroup()) {
+    local_reasons |= GCCC_ERROR_INTEGRITYLEVEL;
+  }
 
-  // Privileges?
+  // First clean up the registry keys left over previously.
+  // Then only check whether we can re-offer, if everything else is OK.
+  CleanUpRegistryValues();
+  if (local_reasons == 0 && !CanReOfferChrome())
+    local_reasons |= GCCC_ERROR_ALREADYOFFERED;
 
-  if (reasons != NULL) {
+  // Done. Copy/return results.
+  if (reasons != NULL)
     *reasons = local_reasons;
-  }
-  return result;
+
+  return (*reasons == 0);
 }
+
+#pragma comment(linker, "/EXPORT:LaunchGoogleChrome=_LaunchGoogleChrome@4,PRIVATE")
+DLLEXPORT BOOL __stdcall LaunchGoogleChrome(HANDLE *proc_handle) {
+  wchar_t launch_cmd[MAX_PATH];
+  size_t size = _countof(launch_cmd);
+  if (!ReadValueFromRegistry(HKEY_LOCAL_MACHINE, kChromeRegKey,
+                             kChromeRegLastLaunchCmd, launch_cmd, &size)) {
+    size = _countof(launch_cmd);
+    if (!ReadValueFromRegistry(HKEY_LOCAL_MACHINE, kChromeRegKey,
+                               kChromeRegLaunchCmd, launch_cmd, &size)) {
+      return false;
+    }
+  }
+
+  STARTUPINFOW si = {sizeof(si)};
+  PROCESS_INFORMATION pi = {0};
+  if (!CreateProcess(NULL, const_cast<wchar_t*>(launch_cmd), NULL, NULL,
+                     FALSE, 0, NULL, NULL, &si, &pi))
+    return false;
+
+  // Handles must be closed or they will leak
+  CloseHandle(pi.hThread);
+
+  // If the caller wants the process handle, we won't close it.
+  if (proc_handle) {
+    *proc_handle = pi.hProcess;
+  } else {
+    CloseHandle(pi.hProcess);
+  }
+  return true;
+}
+\ No newline at end of file
diff --git a/chrome/installer/gcapi/gcapi.h b/chrome/installer/gcapi/gcapi.h
index 24998c6..da56b23 100755
--- a/chrome/installer/gcapi/gcapi.h
+++ b/chrome/installer/gcapi/gcapi.h
@@ -9,19 +9,28 @@
 
 extern "C" {
 // Error conditions for GoogleChromeCompatibilityCheck().
-#define GCCC_ERROR_ALREADYPRESENT                0x01
-#define GCCC_ERROR_ACCESSDENIED                  0x02
-#define GCCC_ERROR_OSNOTSUPPORTED                0x04
+#define GCCC_ERROR_USERLEVELALREADYPRESENT       0x01
+#define GCCC_ERROR_SYSTEMLEVELALREADYPRESENT     0x02
+#define GCCC_ERROR_ACCESSDENIED                  0x04
+#define GCCC_ERROR_OSNOTSUPPORTED                0x08
+#define GCCC_ERROR_ALREADYOFFERED                0x10
+#define GCCC_ERROR_INTEGRITYLEVEL                0x20
 
 #define DLLEXPORT __declspec(dllexport)
 
-// This function returns TRUE if the Google Chrome should be offered.
-// If the answer is FALSE, the reasons DWORD explains why.  If you don't care
+// This function returns TRUE if Google Chrome should be offered.
+// If the return is FALSE, the reasons DWORD explains why.  If you don't care
 // for the reason, you can pass NULL for reasons.
 DLLEXPORT BOOL __stdcall GoogleChromeCompatibilityCheck(DWORD *reasons);
 
-// Funtion pointer type declaration to use with GetProcAddress.
-typedef BOOL (__stdcall * GCCC_FN)(HKEY, DWORD *);
+// This function launches Google Chrome after a successful install. If
+// proc_handle is not NULL, the process handle of the newly created process
+// will be returned.
+DLLEXPORT BOOL __stdcall LaunchGoogleChrome(HANDLE* proc_handle);
+
+// Funtion pointer type declarations to use with GetProcAddress.
+typedef BOOL (__stdcall * GCCC_CompatibilityCheck)(DWORD *);
+typedef BOOL (__stdcall * GCCC_LaunchGC)(HANDLE *);
 }  // extern "C" 
 
 #endif  // # CHROME_INSTALLER_GCAPI_GCAPI_H_
diff --git a/chrome/installer/gcapi/gcapi_test.cc b/chrome/installer/gcapi/gcapi_test.cc
new file mode 100755
index 0000000..78939497
--- /dev/null
+++ b/chrome/installer/gcapi/gcapi_test.cc
@@ -0,0 +1,41 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/installer/gcapi/gcapi.h"
+
+#include <stdio.h>
+
+void call_statically() {
+  DWORD reason = 0;
+  BOOL result = FALSE;
+  
+  result = GoogleChromeCompatibilityCheck(&reason);
+  printf("Static call returned result as %d and reason as %d.\n",
+         result, reason);
+}
+
+void call_dynamically() {
+  HMODULE module = LoadLibrary(L"gcapi_dll.dll");
+  if (module == NULL) {
+    printf("Couldn't load gcapi_dll.dll.\n");
+    return;
+  }
+    
+  GCCC_CompatibilityCheck gccfn = (GCCC_CompatibilityCheck) GetProcAddress(
+      module, "GoogleChromeCompatibilityCheck");
+  if (gccfn != NULL) {
+    DWORD reason = 0;
+    BOOL result = gccfn(&reason);
+    printf("Dynamic call returned result as %d and reason as %d.\n",
+           result, reason);
+  } else {
+    printf("Couldn't find GoogleChromeCompatibilityCheck() in gcapi_dll.\n");
+  }
+  FreeLibrary(module);
+}
+
+int main(int argc, char* argv[]) {
+  call_dynamically();
+  call_statically();
+}
diff --git a/chrome/installer/gcapi/gcapi_test.vcproj b/chrome/installer/gcapi/gcapi_test.vcproj
new file mode 100755
index 0000000..bf6e6f1
--- /dev/null
+++ b/chrome/installer/gcapi/gcapi_test.vcproj
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="8.00"
+	Name="gcapi_test"
+	ProjectGUID="{B64B396B-8EF1-4B6B-A07E-48D40EB961AB}"
+	RootNamespace="gcapi_test"
+	>
+	<Platforms>
+		<Platform
+			Name="Win32"
+		/>
+	</Platforms>
+	<ToolFiles>
+	</ToolFiles>
+	<Configurations>
+		<Configuration
+			Name="Debug|Win32"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(SolutionDir)..\build\common.vsprops;$(SolutionDir)..\build\debug.vsprops"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="Release|Win32"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(SolutionDir)..\build\common.vsprops;$(SolutionDir)..\build\release.vsprops"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+			/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<File
+			RelativePath=".\gcapi_test.cc"
+			>
+		</File>
+		<File
+			RelativePath=".\gcapi.h"
+			>
+		</File>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>