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318 lines
7.8 KiB
318 lines
7.8 KiB
/* w32-util.c - Utility functions for the W32 API
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Copyright (C) 1999 Free Software Foundation, Inc
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Copyright (C) 2001 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <windows.h>
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#include <shlobj.h>
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#include <io.h>
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#include "util.h"
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#include "sema.h"
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#include "debug.h"
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DEFINE_STATIC_LOCK (get_path_lock);
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#define RTLD_LAZY 0
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static __inline__ void *
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dlopen (const char * name, int flag)
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{
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void * hd = LoadLibrary (name);
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return hd;
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}
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static __inline__ void *
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dlsym (void * hd, const char * sym)
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{
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if (hd && sym)
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{
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void * fnc = GetProcAddress (hd, sym);
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if (!fnc)
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return NULL;
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return fnc;
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}
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return NULL;
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}
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static __inline__ int
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dlclose (void * hd)
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{
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if (hd)
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{
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FreeLibrary (hd);
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return 0;
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}
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return -1;
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}
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/* Return a string from the W32 Registry or NULL in case of error.
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Caller must release the return value. A NULL for root is an alias
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for HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE in turn. */
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static char *
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read_w32_registry_string (const char *root, const char *dir, const char *name)
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{
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HKEY root_key, key_handle;
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DWORD n1, nbytes, type;
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char *result = NULL;
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if ( !root )
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root_key = HKEY_CURRENT_USER;
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else if ( !strcmp( root, "HKEY_CLASSES_ROOT" ) )
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root_key = HKEY_CLASSES_ROOT;
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else if ( !strcmp( root, "HKEY_CURRENT_USER" ) )
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root_key = HKEY_CURRENT_USER;
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else if ( !strcmp( root, "HKEY_LOCAL_MACHINE" ) )
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root_key = HKEY_LOCAL_MACHINE;
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else if ( !strcmp( root, "HKEY_USERS" ) )
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root_key = HKEY_USERS;
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else if ( !strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
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root_key = HKEY_PERFORMANCE_DATA;
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else if ( !strcmp( root, "HKEY_CURRENT_CONFIG" ) )
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root_key = HKEY_CURRENT_CONFIG;
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else
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return NULL;
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if ( RegOpenKeyEx ( root_key, dir, 0, KEY_READ, &key_handle ) )
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{
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if (root)
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return NULL; /* no need for a RegClose, so return direct */
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/* It seems to be common practise to fall back to HKLM. */
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if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
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return NULL; /* still no need for a RegClose, so return direct */
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}
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nbytes = 1;
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if ( RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) )
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{
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if (root)
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goto leave;
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/* Try to fallback to HKLM also vor a missing value. */
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RegCloseKey (key_handle);
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if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
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return NULL; /* Nope. */
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if (RegQueryValueEx ( key_handle, name, 0, NULL, NULL, &nbytes))
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goto leave;
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}
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result = malloc ( (n1=nbytes+1) );
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if ( !result )
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goto leave;
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if ( RegQueryValueEx ( key_handle, name, 0, &type, result, &n1 ) )
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{
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free(result); result = NULL;
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goto leave;
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}
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result[nbytes] = 0; /* Make sure it is really a string. */
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if (type == REG_EXPAND_SZ && strchr (result, '%'))
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{
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char *tmp;
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n1 += 1000;
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tmp = malloc (n1+1);
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if (!tmp)
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goto leave;
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nbytes = ExpandEnvironmentStrings (result, tmp, n1);
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if (nbytes && nbytes > n1)
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{
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free (tmp);
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n1 = nbytes;
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tmp = malloc (n1 + 1);
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if (!tmp)
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goto leave;
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nbytes = ExpandEnvironmentStrings (result, tmp, n1);
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if (nbytes && nbytes > n1) {
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free (tmp); /* Oops - truncated, better don't expand at all. */
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goto leave;
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}
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tmp[nbytes] = 0;
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free (result);
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result = tmp;
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}
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else if (nbytes) /* Okay, reduce the length. */
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{
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tmp[nbytes] = 0;
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free (result);
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result = malloc (strlen (tmp)+1);
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if (!result)
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result = tmp;
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else
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{
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strcpy (result, tmp);
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free (tmp);
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}
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}
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else /* Error - don't expand. */
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{
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free (tmp);
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}
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}
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leave:
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RegCloseKey( key_handle );
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return result;
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}
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/* This is a helper function to load and run a Windows function from
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either of one DLLs. */
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static HRESULT
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w32_shgetfolderpath (HWND a, int b, HANDLE c, DWORD d, LPSTR e)
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{
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static int initialized;
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static HRESULT (WINAPI * func)(HWND,int,HANDLE,DWORD,LPSTR);
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if (!initialized)
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{
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static char *dllnames[] = { "shell32.dll", "shfolder.dll", NULL };
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void *handle;
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int i;
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initialized = 1;
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for (i=0, handle = NULL; !handle && dllnames[i]; i++)
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{
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handle = dlopen (dllnames[i], RTLD_LAZY);
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if (handle)
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{
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func = dlsym (handle, "SHGetFolderPathA");
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if (!func)
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{
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dlclose (handle);
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handle = NULL;
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}
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}
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}
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}
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if (func)
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return func (a,b,c,d,e);
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else
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return -1;
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}
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static char *
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find_program_in_registry (const char *name)
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{
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char *program = NULL;
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program = read_w32_registry_string (NULL, "Software\\GNU\\GnuPG", name);
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if (program)
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{
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int i;
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DEBUG2 ("found %s in registry: `%s'", name, program);
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for (i = 0; program[i]; i++)
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{
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if (program[i] == '/')
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program[i] = '\\';
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}
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}
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return program;
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}
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static char *
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find_program_at_standard_place (const char *name)
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{
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char path[MAX_PATH];
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char *result = NULL;
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if (w32_shgetfolderpath (NULL, CSIDL_PROGRAM_FILES, NULL, 0, path) >= 0)
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{
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result = malloc (strlen (path) + 1 + strlen (name) + 1);
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if (result)
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{
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strcpy (stpcpy (stpcpy (result, path), "\\"), name);
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if (access (result, F_OK))
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{
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free (result);
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result = NULL;
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}
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}
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}
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return result;
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}
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const char *
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_gpgme_get_gpg_path (void)
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{
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static char *gpg_program;
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LOCK (get_path_lock);
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if (!gpg_program)
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gpg_program = find_program_in_registry ("gpgProgram");
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if (!gpg_program)
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gpg_program = find_program_at_standard_place ("GNU\\GnuPG\\gpg.exe");
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#ifdef GPG_PATH
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if (!gpg_program)
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gpg_program = GPG_PATH;
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#endif
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UNLOCK (get_path_lock);
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return gpg_program;
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}
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const char *
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_gpgme_get_gpgsm_path (void)
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{
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static char *gpgsm_program;
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LOCK (get_path_lock);
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if (!gpgsm_program)
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gpgsm_program = find_program_in_registry ("gpgsmProgram");
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if (!gpgsm_program)
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gpgsm_program = find_program_at_standard_place ("GNU\\GnuPG\\gpgsm.exe");
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#ifdef GPGSM_PATH
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if (!gpgsm_program)
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gpgsm_program = GPGSM_PATH;
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#endif
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UNLOCK (get_path_lock);
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return gpgsm_program;
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}
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/* Return an integer value from gpgme specific configuration
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entries. VALUE receives that value; function returns true if a value
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has been configured and false if not. */
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int
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_gpgme_get_conf_int (const char *key, int *value)
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{
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char *tmp = read_w32_registry_string (NULL, "Software\\GNU\\gpgme", key);
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if (!tmp)
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return 0;
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*value = atoi (tmp);
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free (tmp);
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return 1;
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}
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