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/* GPGOE.c - GnuPG for Outlook Express |
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* Copyright (C) 2001, 2002, 2003, 2006 Timo Schulz |
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* |
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* This file is part of GPGOE. |
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* |
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* GPGOE is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* GPGOE is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with GPGOE; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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*/ |
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|
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#ifdef HAVE_CONFIG_H |
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#include <config.h> |
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#endif |
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|
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#include <windows.h> |
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#include <stdio.h> |
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#include "gpgme.h" |
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#include "GPGOE.h" |
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|
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/* Global DLL module handle. */ |
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HINSTANCE mod_hinst_dll; |
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|
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/* Outlook Express old window procedure. */ |
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WNDPROC oe_proc_old; |
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|
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/* DLL hook handle for the CBT function. */ |
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static HHOOK ctb_hook = NULL; |
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|
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/* Outlook Express window handle. */ |
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static HWND oe_hwnd = NULL; |
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|
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|
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/* Main DLL entry point. */ |
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BOOL WINAPI |
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DllMain (HINSTANCE hinst_dll, DWORD reason, LPVOID reserved) |
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{ |
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switch (reason) { |
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case DLL_PROCESS_ATTACH: |
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mod_hinst_dll = hinst_dll; |
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break; |
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|
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case DLL_PROCESS_DETACH: |
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mod_hinst_dll = NULL; |
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break; |
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|
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case DLL_THREAD_ATTACH: |
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break; |
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|
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case DLL_THREAD_DETACH: |
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break; |
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} |
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|
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return TRUE; |
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} |
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|
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|
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/* Quick and dirty check if the dialog is a common dialog |
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and the 'File {Open, Save}' style. */ |
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static int |
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is_common_file_dlg (HWND h) |
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{ |
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HWND button = GetDlgItem (h, 1040); |
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char wclass[200]; |
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|
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if (button == NULL) |
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return 0; |
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if (GetClassName (button, wclass, 200) > 0 |
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&& !stricmp (wclass, "Button")) |
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return -1; |
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return 0; |
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} |
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|
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|
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|
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/* CTB hook procedure. |
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Monitors the creation of all windows and subclass the window |
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if it belongs to the Outlook Express (message) class. */ |
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static LRESULT CALLBACK |
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ctb_proc (int code, WPARAM wparam, LPARAM lparam) |
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{ |
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HWND hwnd; |
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char wclass[256]; |
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|
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if (code < 0) |
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return CallNextHookEx (ctb_hook, code, wparam, lparam); |
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|
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hwnd = (HWND)wparam; |
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switch (code) { |
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case HCBT_CREATEWND: |
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GetClassName (hwnd, wclass, sizeof (wclass) - 1); |
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if (!strcmp (wclass, "ATH_Note")) { |
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oe_proc_old = (WNDPROC) GetWindowLong (hwnd, GWL_WNDPROC); |
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if (!oe_proc_old) |
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show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK, |
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"Could not get window procedure ec=%d", |
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(int)GetLastError ()); |
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else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc)) |
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show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK, |
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"Could not set window procedure: ec=%d", |
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(int)GetLastError ()); |
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else |
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oe_hwnd = hwnd; |
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} |
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|
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if (!strcmp (wclass, "Outlook Express Browser Class")) { |
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oe_main_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC); |
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if (!oe_main_proc_old) |
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show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK, |
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"Could not get window procedure ec=%d", |
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(int)GetLastError ()); |
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else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_main_proc)) |
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show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK, |
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"Could not set window procedure: ec=%d", |
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(int)GetLastError ()); |
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} |
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break; |
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|
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case HCBT_ACTIVATE: |
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#if 0 |
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if (plugin_active != NULL && |
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WaitForSingleObject (plugin_active, 0) == WAIT_OBJECT_0) { |
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char wclass[200]; |
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|
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if (GetClassName (hwnd, wclass, sizeof (wclass)-1) <= 0 || |
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!strstr (wclass, "#32770") || !is_common_file_dlg (hwnd)) |
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break; |
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of_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC); |
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SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)of_proc); |
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} |
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#endif |
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break; |
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} |
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return CallNextHookEx (ctb_hook, code, wparam, lparam); |
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} |
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|
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|
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/* Initialize the hooks; a named mutex prevents that the |
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initialisation is done twice. |
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Return value: 0 on success. */ |
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int |
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gpgoe_initialize (void) |
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{ |
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CreateMutex (NULL, TRUE, "gpgoe"); |
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if (GetLastError () == ERROR_ALREADY_EXISTS) |
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return 0; |
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ctb_hook = SetWindowsHookEx (WH_CBT, ctb_proc, mod_hinst_dll, 0); |
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return ctb_hook? 0 : (int)GetLastError (); |
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} |
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|
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|
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/* Deinitialize the hooks and close all handles. |
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Return value: 0 on success. */ |
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int |
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gpgoe_remove (void) |
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{ |
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HANDLE hd; |
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int rc; |
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|
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hd = CreateMutex (NULL, TRUE, "gpgoe"); |
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if (GetLastError() == ERROR_ALREADY_EXISTS) { |
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oe_hwnd = NULL; |
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CloseHandle (hd); |
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} |
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SetWindowLong (oe_hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc_old); |
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rc = UnhookWindowsHookEx (ctb_hook); |
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return rc ? 0 : (int)GetLastError (); |
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} |
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