trunk/src/GPGOE.c

/* GPGOE.c - GnuPG for Outlook Express
 *      Copyright (C) 2001, 2002, 2003, 2006, 2007 Timo Schulz
 *
 * This file is part of GPGOE.
 *
 * GPGOE is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 * 
 * GPGOE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <windows.h>
#include <stdio.h>
#include "gpgme.h"
#include "GPGOE.h"

/* Global DLL module handle. */
HINSTANCE mod_hinst_dll;

/* Outlook Express old window procedure. */
WNDPROC oe_proc_old;

/* DLL hook handle for the CBT function. */
static HHOOK ctb_hook = NULL;

/* Outlook Express window handle. */
static HWND oe_hwnd = NULL;

/* We need a shared section to define variables which
   will keep their values in all address spaces. */
#ifndef __GNUC__
#pragma  data_seg(".SHARDAT")
#endif
/* Supported GPGOE feature modes. */
int gpgoe_active_modes ATTR_SEC = 0;

/* FIXME: we currently limit the passphrase to N octets. */
char gpgoe_pass_cache[HASH_BUCKETS][MAX_PASS_LEN];
#ifndef __GNUC__
#pragma data_seg()
#endif


/* Main DLL entry point. */
BOOL WINAPI
DllMain (HINSTANCE hinst_dll, DWORD reason, LPVOID reserved)
{
    switch (reason) {
    case DLL_PROCESS_ATTACH: 
        mod_hinst_dll = hinst_dll; 
        break;

    case DLL_PROCESS_DETACH: 
        mod_hinst_dll = NULL; 
        break;

    case DLL_THREAD_ATTACH: 
        break;

    case DLL_THREAD_DETACH: 
        break;
    }
    
    return TRUE;
}


#if 0
/* Quick and dirty check if the dialog is a common dialog
   and the 'File {Open, Save}' style. */
static int 
is_common_file_dlg (HWND h)
{
    HWND button = GetDlgItem (h, 1040);
    char wclass[200];

    if (button == NULL)
        return 0;
    if (GetClassName (button, wclass, 200) > 0
        && !stricmp (wclass, "Button"))
        return -1;
    return 0;
}
#endif


/* CTB hook procedure.
   Monitors the creation of all windows and subclass the window
   if it belongs to the Outlook Express (message) class. */
static LRESULT CALLBACK 
ctb_proc (int code, WPARAM wparam, LPARAM lparam)
{
    HWND hwnd;
    char wclass[256];

    if (code < 0)
        return CallNextHookEx (ctb_hook, code, wparam, lparam);

    hwnd = (HWND)wparam;
    switch (code) {
    case HCBT_CREATEWND:
        GetClassName (hwnd, wclass, DIM (wclass) - 1);
        if (!strcmp (wclass, "ATH_Note")) {
            oe_proc_old = (WNDPROC) GetWindowLong (hwnd, GWL_WNDPROC);
            if (!oe_proc_old)
                show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK,
                            "Could not get window procedure ec=%d",
                            (int)GetLastError ());
            else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc))
                show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK,
                           "Could not set window procedure: ec=%d",
                           (int)GetLastError ());
            else
                oe_hwnd = hwnd;
        }

        if ((gpgoe_active_modes & GPGOE_MODE_PLAINREPLY) &&
            !strcmp (wclass, "Outlook Express Browser Class")) {
            oe_main_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC);
            if (!oe_main_proc_old)
                show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK,
                            "Could not get window procedure ec=%d",
                            (int)GetLastError ());
            else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_main_proc))
                show_error (NULL, "GPGOE", MB_ICONERROR|MB_OK,
                            "Could not set window procedure: ec=%d",
                            (int)GetLastError ());
        }
        break;

    case HCBT_ACTIVATE:
#if 0 /* Disable the attachment related code for now. */
        if (plugin_active != NULL &&
            WaitForSingleObject (plugin_active, 0) == WAIT_OBJECT_0) {

            if (GetClassName (hwnd, wclass, sizeof (wclass)-1) <= 0 ||
                !strstr (wclass, "#32770") || !is_common_file_dlg (hwnd))
                break;
            of_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC);
            SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)of_proc);
        }
#endif
        break;
    }   
    return CallNextHookEx (ctb_hook, code, wparam, lparam);
}


/* Initialize the hooks; a named mutex prevents that the
   initialisation is done twice.
   Return value: 0 on success. */
int
gpgoe_initialize (void)
{
    reset_pass_cache ();
    CreateMutex (NULL, TRUE, "gpgoe");
    if (GetLastError () == ERROR_ALREADY_EXISTS)
        return 0;
    ctb_hook = SetWindowsHookEx (WH_CBT, ctb_proc, mod_hinst_dll, 0);
    return ctb_hook? 0 : (int)GetLastError ();
}


/* Deinitialize the hooks and close all handles.
   Return value: 0 on success. */
int
gpgoe_remove (void)
{
    HANDLE hd;
    int rc;
    
    hd = CreateMutex (NULL, TRUE, "gpgoe");
    if (GetLastError() == ERROR_ALREADY_EXISTS) {
        oe_hwnd = NULL;
        CloseHandle (hd);
    }
    SetWindowLong (oe_hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc_old);
    rc = UnhookWindowsHookEx (ctb_hook);

    /* reset global variables. */
    reset_pass_cache ();
    gpgoe_active_modes = 0;

    return rc ? 0 : (int)GetLastError ();
}


/* Change the active plug-in modes, enable mode @mode. */
void
gpgoe_set_active_modes (int mode)
{
    gpgoe_active_modes = mode;
}


int
gpgoe_get_active_modes (void)
{
    return gpgoe_active_modes;
}
1	/* GPGOE.c - GnuPG for Outlook Express
2	* Copyright (C) 2001, 2002, 2003, 2006, 2007 Timo Schulz
3	*
4	* This file is part of GPGOE.
5	*
6	* GPGOE is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU Lesser General Public License as published by
8	* the Free Software Foundation; either version 2.1 of the License, or
9	* (at your option) any later version.
10	*
11	* GPGOE is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*/
16
17	#ifdef HAVE_CONFIG_H
18	#include <config.h>
19	#endif
20
21	#include <windows.h>
22	#include <stdio.h>
23	#include "gpgme.h"
24	#include "GPGOE.h"
25
26	/* Global DLL module handle. */
27	HINSTANCE mod_hinst_dll;
28
29	/* Outlook Express old window procedure. */
30	WNDPROC oe_proc_old;
31
32	/* DLL hook handle for the CBT function. */
33	static HHOOK ctb_hook = NULL;
34
35	/* Outlook Express window handle. */
36	static HWND oe_hwnd = NULL;
37
38	/* We need a shared section to define variables which
39	will keep their values in all address spaces. */
40	#ifndef __GNUC__
41	#pragma data_seg(".SHARDAT")
42	#endif
43	/* Supported GPGOE feature modes. */
44	int gpgoe_active_modes ATTR_SEC = 0;
45
46	/* FIXME: we currently limit the passphrase to N octets. */
47	char gpgoe_pass_cache[HASH_BUCKETS][MAX_PASS_LEN];
48	#ifndef __GNUC__
49	#pragma data_seg()
50	#endif
51
52
53	/* Main DLL entry point. */
54	BOOL WINAPI
55	DllMain (HINSTANCE hinst_dll, DWORD reason, LPVOID reserved)
56	{
57	switch (reason) {
58	case DLL_PROCESS_ATTACH:
59	mod_hinst_dll = hinst_dll;
60	break;
61
62	case DLL_PROCESS_DETACH:
63	mod_hinst_dll = NULL;
64	break;
65
66	case DLL_THREAD_ATTACH:
67	break;
68
69	case DLL_THREAD_DETACH:
70	break;
71	}
72
73	return TRUE;
74	}
75
76
77	#if 0
78	/* Quick and dirty check if the dialog is a common dialog
79	and the 'File {Open, Save}' style. */
80	static int
81	is_common_file_dlg (HWND h)
82	{
83	HWND button = GetDlgItem (h, 1040);
84	char wclass[200];
85
86	if (button == NULL)
87	return 0;
88	if (GetClassName (button, wclass, 200) > 0
89	&& !stricmp (wclass, "Button"))
90	return -1;
91	return 0;
92	}
93	#endif
94
95
96	/* CTB hook procedure.
97	Monitors the creation of all windows and subclass the window
98	if it belongs to the Outlook Express (message) class. */
99	static LRESULT CALLBACK
100	ctb_proc (int code, WPARAM wparam, LPARAM lparam)
101	{
102	HWND hwnd;
103	char wclass[256];
104
105	if (code < 0)
106	return CallNextHookEx (ctb_hook, code, wparam, lparam);
107
108	hwnd = (HWND)wparam;
109	switch (code) {
110	case HCBT_CREATEWND:
111	GetClassName (hwnd, wclass, DIM (wclass) - 1);
112	if (!strcmp (wclass, "ATH_Note")) {
113	oe_proc_old = (WNDPROC) GetWindowLong (hwnd, GWL_WNDPROC);
114	if (!oe_proc_old)
115	show_error (NULL, "GPGOE", MB_ICONERROR\|MB_OK,
116	"Could not get window procedure ec=%d",
117	(int)GetLastError ());
118	else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc))
119	show_error (NULL, "GPGOE", MB_ICONERROR\|MB_OK,
120	"Could not set window procedure: ec=%d",
121	(int)GetLastError ());
122	else
123	oe_hwnd = hwnd;
124	}
125
126	if ((gpgoe_active_modes & GPGOE_MODE_PLAINREPLY) &&
127	!strcmp (wclass, "Outlook Express Browser Class")) {
128	oe_main_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC);
129	if (!oe_main_proc_old)
130	show_error (NULL, "GPGOE", MB_ICONERROR\|MB_OK,
131	"Could not get window procedure ec=%d",
132	(int)GetLastError ());
133	else if (!SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_main_proc))
134	show_error (NULL, "GPGOE", MB_ICONERROR\|MB_OK,
135	"Could not set window procedure: ec=%d",
136	(int)GetLastError ());
137	}
138	break;
139
140	case HCBT_ACTIVATE:
141	#if 0 /* Disable the attachment related code for now. */
142	if (plugin_active != NULL &&
143	WaitForSingleObject (plugin_active, 0) == WAIT_OBJECT_0) {
144
145	if (GetClassName (hwnd, wclass, sizeof (wclass)-1) <= 0 \|\|
146	!strstr (wclass, "#32770") \|\| !is_common_file_dlg (hwnd))
147	break;
148	of_proc_old = (WNDPROC)GetWindowLong (hwnd, GWL_WNDPROC);
149	SetWindowLong (hwnd, GWL_WNDPROC, (LONG)(WNDPROC)of_proc);
150	}
151	#endif
152	break;
153	}
154	return CallNextHookEx (ctb_hook, code, wparam, lparam);
155	}
156
157
158	/* Initialize the hooks; a named mutex prevents that the
159	initialisation is done twice.
160	Return value: 0 on success. */
161	int
162	gpgoe_initialize (void)
163	{
164	reset_pass_cache ();
165	CreateMutex (NULL, TRUE, "gpgoe");
166	if (GetLastError () == ERROR_ALREADY_EXISTS)
167	return 0;
168	ctb_hook = SetWindowsHookEx (WH_CBT, ctb_proc, mod_hinst_dll, 0);
169	return ctb_hook? 0 : (int)GetLastError ();
170	}
171
172
173	/* Deinitialize the hooks and close all handles.
174	Return value: 0 on success. */
175	int
176	gpgoe_remove (void)
177	{
178	HANDLE hd;
179	int rc;
180
181	hd = CreateMutex (NULL, TRUE, "gpgoe");
182	if (GetLastError() == ERROR_ALREADY_EXISTS) {
183	oe_hwnd = NULL;
184	CloseHandle (hd);
185	}
186	SetWindowLong (oe_hwnd, GWL_WNDPROC, (LONG)(WNDPROC)oe_proc_old);
187	rc = UnhookWindowsHookEx (ctb_hook);
188
189	/* reset global variables. */
190	reset_pass_cache ();
191	gpgoe_active_modes = 0;
192
193	return rc ? 0 : (int)GetLastError ();
194	}
195
196
197	/* Change the active plug-in modes, enable mode @mode. */
198	void
199	gpgoe_set_active_modes (int mode)
200	{
201	gpgoe_active_modes = mode;
202	}
203
204
205	int
206	gpgoe_get_active_modes (void)
207	{
208	return gpgoe_active_modes;
209	}