libmcrypt/lib/mcrypt_extra.c

/* 
 * Copyright (C) 1998,1999 Nikos Mavroyanopoulos 
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of the
 * GNU Library General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any
 * later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/* $Id: mcrypt_extra.c,v 1.7 2001/01/23 11:51:19 nmav Exp $ */

#ifndef LIBDEFS_H
#define LIBDEFS_H
#include <libdefs.h>
#endif
#include <bzero.h>
#include <xmemory.h>
#include <mcrypt_internal.h>

#if 0
extern int preloaded_symbols;
#endif

int mcrypt_algorithm_module_ok(const char *file, const char *directory);
int mcrypt_mode_module_ok(const char *file, const char *directory);
#ifndef USE_LTDL
void *mcrypt_dlopen_ext(const char *filename);
#endif
void *mcrypt_dlopen(const char *a_directory, const char *m_directory,
                    const char *filename);

#define MAXPATHLEN 256
WIN32DLL_DEFINE char *mcrypt_readdir(DIR * dirstream)
{

        char *result;
        struct dirent *ret = NULL;
#ifdef HAVE_READDIR_R
        struct dirent ret2[sizeof(struct dirent)+MAXPATHLEN];
#endif

#ifdef DT_REG
        do {
#endif

#ifdef HAVE_READDIR_R
                readdir_r(dirstream, ret2, &ret);
                if (ret==NULL) return NULL;
#else
                ret = readdir(dirstream);
#endif

                result = calloc(1, strlen(ret->d_name) + 1);
                if (result == NULL) {
                        return NULL;
                }
                strcpy(result, ret->d_name);
#ifdef DT_REG
        }
        while ((ret->d_type != DT_REG) && (ret->d_type != DT_UNKNOWN)
               && (ret != NULL));
#endif

        return result;

}

WIN32DLL_DEFINE char **mcrypt_list_algorithms(char *libdir, int *size)
{
        DIR *pdir;
        char directory[512];
        char *dirname;
        char **filename = NULL, *ptr;
        int tmpsize;

        *size = 0;

        if (libdir == NULL) {
                strcpy(directory, LIBDIR);
        } else {
                strcpy(directory, libdir);
        }

        pdir = opendir(directory);
        if (pdir == NULL) {
                fprintf(stderr, "Unable to open directory %s.\n",
                        directory);
                return NULL;
        }

        for (;;) {
                dirname = mcrypt_readdir(pdir);
                if (dirname != NULL) {
                        tmpsize = strlen(dirname);
                        if (tmpsize > 3) {
                                if (mcrypt_algorithm_module_ok
                                    (dirname, directory) > 0) {
                                        filename =
                                            realloc(filename,
                                                    (*size +
                                                     1) * sizeof(char *));
                                        if (filename==NULL) return NULL;
                                        filename[*size] =
                                            calloc(1, tmpsize + 1);
                                        if (filename[*size]==NULL) return NULL;
                                        strcpy(filename[*size], dirname);

                                        ptr =
                                            strrchr(filename[*size], '.');
                                        if (ptr != NULL)
                                                *ptr = '\0';
                                        (*size)++;
                                }
                        }
                } else {
                        break;
                }

        }


        closedir(pdir);

        return filename;

}

WIN32DLL_DEFINE char **mcrypt_list_modes(char *libdir, int *size)
{
        DIR *pdir;
        char directory[512];
        char *dirname;
        char **filename = NULL, *ptr;
        int tmpsize;

        if (libdir == NULL) {
                strcpy(directory, LIBDIR);
        } else {
                strcpy(directory, libdir);
        }

        pdir = opendir(directory);
        if (pdir == NULL) {
                fprintf(stderr, "Unable to open directory %s.\n",
                        directory);
                return NULL;
        }

        *size = 0;
        for (;;) {

                dirname = mcrypt_readdir(pdir);
                if (dirname != NULL) {
                        tmpsize = strlen(dirname);
                        if (tmpsize > 3) {
                                if (mcrypt_mode_module_ok
                                    (dirname, directory) > 0) {
                                        filename =
                                            realloc(filename,
                                                    (*size +
                                                     1) * sizeof(char *));
                                        if (filename==NULL) return NULL;
                                        
                                        filename[*size] =
                                            calloc(1, tmpsize + 1);
                                        if (filename[*size]==NULL) return NULL;
                                        
                                        strcpy(filename[*size], dirname);
                                        ptr =
                                            strrchr(filename[*size], '.');
                                        if (ptr != NULL)
                                                *ptr = '\0';
                                        (*size)++;
                                }
                        }
                        free(dirname);
                } else {
                        break;
                }

        }

        closedir(pdir);
        return filename;
}

WIN32DLL_DEFINE void mcrypt_free_p(char **p, int size)
{
        int i;

        for (i = 0; i < size; i++) {
                free(p[i]);
        }
        free(p);
}

WIN32DLL_DEFINE
    int mcrypt_algorithm_module_ok(const char *file, const char *directory)
{
        word32 ret;
        lt_dlhandle *_handle;
        int (*_version) (void);

        if (file == NULL && directory == NULL) {
                return MCRYPT_UNKNOWN_ERROR;
        }

        if (lt_dlinit() != 0) {
                return MCRYPT_UNKNOWN_ERROR;
        }


/*      LTDL_SET_PRELOADED_SYMBOLS(); */

        _handle = mcrypt_dlopen(directory, NULL, file);

        if (!_handle) {
/*              fputs(lt_dlerror(), stderr);
 *              fputs("\n", stderr);
 */
                lt_dlexit();
                return MCRYPT_UNKNOWN_ERROR;
        }


        _version = lt_dlsym(_handle, "_mcrypt_algorithm_version");

        if (_version == NULL) {
                lt_dlclose(_handle);
                lt_dlexit();
                return MCRYPT_UNKNOWN_ERROR;
        }

        ret = _version();

        lt_dlclose(_handle);
        lt_dlexit();

        return ret;

}

WIN32DLL_DEFINE
    int mcrypt_mode_module_ok(const char *file, const char *directory)
{
        word32 ret;
        lt_dlhandle *_handle;
        int (*_version) (void);

        if (file == NULL && directory == NULL) {
                return MCRYPT_UNKNOWN_ERROR;
        }

        if (lt_dlinit() != 0) {
                return MCRYPT_UNKNOWN_ERROR;
        }
/*      LTDL_SET_PRELOADED_SYMBOLS(); */

        _handle = mcrypt_dlopen(directory, NULL, file);

        if (!_handle) {
                lt_dlexit();
                return MCRYPT_UNKNOWN_ERROR;
        }


        _version = lt_dlsym(_handle, "_mcrypt_mode_version");

        if (_version == NULL) {
                lt_dlclose(_handle);
                lt_dlexit();
                return MCRYPT_UNKNOWN_ERROR;
        }

        ret = _version();

        lt_dlclose(_handle);
        lt_dlexit();

        return ret;

}

/* Taken from libgcrypt */

static const char*
parse_version_number( const char *s, int *number )
{
    int val = 0;

    if( *s == '0' && isdigit(s[1]) )
        return NULL; /* leading zeros are not allowed */
    for ( ; isdigit(*s); s++ ) {
        val *= 10;
        val += *s - '0';
    }
    *number = val;
    return val < 0? NULL : s;
}


static const char *
parse_version_string( const char *s, int *major, int *minor, int *micro )
{
    s = parse_version_number( s, major );
    if( !s || *s != '.' )
        return NULL;
    s++;
    s = parse_version_number( s, minor );
    if( !s || *s != '.' )
        return NULL;
    s++;
    s = parse_version_number( s, micro );
    if( !s )
        return NULL;
    return s; /* patchlevel */
}

/****************
 * Check that the the version of the library is at minimum the requested one
 * and return the version string; return NULL if the condition is not
 * satisfied.  If a NULL is passed to this function, no check is done,
 * but the version string is simply returned.
 */
const char *
mcrypt_check_version( const char *req_version )
{
    const char *ver = VERSION;
    int my_major, my_minor, my_micro;
    int rq_major, rq_minor, rq_micro;
    const char *my_plvl, *rq_plvl;

    if ( !req_version )
        return ver;

    my_plvl = parse_version_string( ver, &my_major, &my_minor, &my_micro );
    if ( !my_plvl )
        return NULL;  /* very strange our own version is bogus */
    rq_plvl = parse_version_string( req_version, &rq_major, &rq_minor,
                                                                &rq_micro );
    if ( !rq_plvl )
        return NULL;  /* req version string is invalid */

    if ( my_major > rq_major
        || (my_major == rq_major && my_minor > rq_minor)
        || (my_major == rq_major && my_minor == rq_minor
                                 && my_micro > rq_micro)
        || (my_major == rq_major && my_minor == rq_minor
                                 && my_micro == rq_micro
                                 && strcmp( my_plvl, rq_plvl ) >= 0) ) {
        return ver;
    }
    return NULL;
}

1	nmav	1.1	/*
2			* Copyright (C) 1998,1999 Nikos Mavroyanopoulos
3			*
4			* This library is free software; you can redistribute it and/or modify it under the terms of the
5			* GNU Library General Public License as published by the Free Software
6			* Foundation; either version 2 of the License, or (at your option) any
7			* later version.
8			*
9			* This library is distributed in the hope that it will be useful,
10			* but WITHOUT ANY WARRANTY; without even the implied warranty of
11			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12			* Library General Public License for more details.
13			*
14			* You should have received a copy of the GNU Library General Public
15			* License along with this library; if not, write to the
16			* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17			* Boston, MA 02111-1307, USA.
18			*/
19
20	nmav	1.8	/* $Id: mcrypt_extra.c,v 1.7 2001/01/23 11:51:19 nmav Exp $ */
21	nmav	1.1
22			#ifndef LIBDEFS_H
23			#define LIBDEFS_H
24			#include <libdefs.h>
25			#endif
26			#include <bzero.h>
27			#include <xmemory.h>
28			#include <mcrypt_internal.h>
29
30			#if 0
31			extern int preloaded_symbols;
32	nmav	1.3	#endif
33	nmav	1.1
34	nmav	1.3	int mcrypt_algorithm_module_ok(const char file, const char directory);
35			int mcrypt_mode_module_ok(const char file, const char directory);
36	nmav	1.2	#ifndef USE_LTDL
37	nmav	1.3	void mcrypt_dlopen_ext(const char filename);
38	nmav	1.2	#endif
39	nmav	1.6	void mcrypt_dlopen(const char a_directory, const char *m_directory,
40			const char *filename);
41	nmav	1.3
42	nmav	1.6	#define MAXPATHLEN 256
43			WIN32DLL_DEFINE char mcrypt_readdir(DIR dirstream)
44	nmav	1.3	{
45	nmav	1.2
46	nmav	1.6	char *result;
47	nmav	1.3	struct dirent *ret = NULL;
48	nmav	1.6	#ifdef HAVE_READDIR_R
49			struct dirent ret2[sizeof(struct dirent)+MAXPATHLEN];
50			#endif
51
52			#ifdef DT_REG
53			do {
54			#endif
55	nmav	1.2
56			#ifdef HAVE_READDIR_R
57	nmav	1.6	readdir_r(dirstream, ret2, &ret);
58			if (ret==NULL) return NULL;
59	nmav	1.2	#else
60	nmav	1.6	ret = readdir(dirstream);
61	nmav	1.2	#endif
62	nmav	1.6
63			result = calloc(1, strlen(ret->d_name) + 1);
64			if (result == NULL) {
65			return NULL;
66			}
67			strcpy(result, ret->d_name);
68			#ifdef DT_REG
69	nmav	1.3	}
70	nmav	1.6	while ((ret->d_type != DT_REG) && (ret->d_type != DT_UNKNOWN)
71			&& (ret != NULL));
72			#endif
73	nmav	1.3
74			return result;
75
76	nmav	1.2	}
77	nmav	1.1
78	nmav	1.6	WIN32DLL_DEFINE char *mcrypt_list_algorithms(char libdir, int *size)
79	nmav	1.1	{
80			DIR *pdir;
81	nmav	1.2	char directory[512];
82	nmav	1.6	char *dirname;
83	nmav	1.1	char *filename = NULL, ptr;
84			int tmpsize;
85
86			*size = 0;
87
88			if (libdir == NULL) {
89			strcpy(directory, LIBDIR);
90			} else {
91			strcpy(directory, libdir);
92			}
93
94			pdir = opendir(directory);
95			if (pdir == NULL) {
96			fprintf(stderr, "Unable to open directory %s.\n",
97			directory);
98			return NULL;
99			}
100
101			for (;;) {
102	nmav	1.2	dirname = mcrypt_readdir(pdir);
103	nmav	1.1	if (dirname != NULL) {
104	nmav	1.6	tmpsize = strlen(dirname);
105	nmav	1.3	if (tmpsize > 3) {
106	nmav	1.6	if (mcrypt_algorithm_module_ok
107			(dirname, directory) > 0) {
108			filename =
109			realloc(filename,
110			(*size +
111			1) * sizeof(char *));
112	nmav	1.7	if (filename==NULL) return NULL;
113	nmav	1.6	filename[*size] =
114			calloc(1, tmpsize + 1);
115	nmav	1.7	if (filename[*size]==NULL) return NULL;
116	nmav	1.6	strcpy(filename[*size], dirname);
117	nmav	1.3
118	nmav	1.6	ptr =
119			strrchr(filename[*size], '.');
120	nmav	1.3	if (ptr != NULL)
121			*ptr = '\0';
122			(*size)++;
123	nmav	1.1	}
124	nmav	1.3	}
125	nmav	1.1	} else {
126			break;
127			}
128
129			}
130
131
132	nmav	1.3	closedir(pdir);
133	nmav	1.1
134			return filename;
135
136			}
137
138	nmav	1.6	WIN32DLL_DEFINE char *mcrypt_list_modes(char libdir, int *size)
139	nmav	1.1	{
140			DIR *pdir;
141	nmav	1.2	char directory[512];
142	nmav	1.6	char *dirname;
143	nmav	1.1	char *filename = NULL, ptr;
144			int tmpsize;
145
146			if (libdir == NULL) {
147			strcpy(directory, LIBDIR);
148			} else {
149			strcpy(directory, libdir);
150			}
151
152			pdir = opendir(directory);
153			if (pdir == NULL) {
154			fprintf(stderr, "Unable to open directory %s.\n",
155			directory);
156			return NULL;
157			}
158
159			*size = 0;
160			for (;;) {
161
162	nmav	1.2	dirname = mcrypt_readdir(pdir);
163	nmav	1.1	if (dirname != NULL) {
164	nmav	1.6	tmpsize = strlen(dirname);
165			if (tmpsize > 3) {
166			if (mcrypt_mode_module_ok
167			(dirname, directory) > 0) {
168			filename =
169			realloc(filename,
170			(*size +
171			1) * sizeof(char *));
172	nmav	1.7	if (filename==NULL) return NULL;
173
174	nmav	1.6	filename[*size] =
175			calloc(1, tmpsize + 1);
176	nmav	1.7	if (filename[*size]==NULL) return NULL;
177
178	nmav	1.6	strcpy(filename[*size], dirname);
179			ptr =
180			strrchr(filename[*size], '.');
181			if (ptr != NULL)
182			*ptr = '\0';
183			(*size)++;
184	nmav	1.1	}
185			}
186	nmav	1.6	free(dirname);
187	nmav	1.1	} else {
188			break;
189			}
190
191			}
192
193			closedir(pdir);
194			return filename;
195			}
196
197	nmav	1.6	WIN32DLL_DEFINE void mcrypt_free_p(char **p, int size)
198	nmav	1.3	{
199			int i;
200	nmav	1.1
201	nmav	1.3	for (i = 0; i < size; i++) {
202	nmav	1.1	free(p[i]);
203			}
204			free(p);
205			}
206
207	nmav	1.5	WIN32DLL_DEFINE
208	nmav	1.6	int mcrypt_algorithm_module_ok(const char file, const char directory)
209	nmav	1.1	{
210			word32 ret;
211			lt_dlhandle *_handle;
212			int (*_version) (void);
213
214	nmav	1.3	if (file == NULL && directory == NULL) {
215	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
216			}
217	nmav	1.4
218	nmav	1.3	if (lt_dlinit() != 0) {
219	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
220			}
221	nmav	1.4
222	nmav	1.3
223	nmav	1.2	/* LTDL_SET_PRELOADED_SYMBOLS(); */
224	nmav	1.3
225	nmav	1.2	_handle = mcrypt_dlopen(directory, NULL, file);
226	nmav	1.1
227			if (!_handle) {
228			/* fputs(lt_dlerror(), stderr);
229			* fputs("\n", stderr);
230			*/
231			lt_dlexit();
232			return MCRYPT_UNKNOWN_ERROR;
233			}
234
235
236			_version = lt_dlsym(_handle, "_mcrypt_algorithm_version");
237
238	nmav	1.3	if (_version == NULL) {
239	nmav	1.1	lt_dlclose(_handle);
240			lt_dlexit();
241			return MCRYPT_UNKNOWN_ERROR;
242			}
243
244			ret = _version();
245
246			lt_dlclose(_handle);
247			lt_dlexit();
248
249			return ret;
250
251			}
252
253	nmav	1.5	WIN32DLL_DEFINE
254	nmav	1.6	int mcrypt_mode_module_ok(const char file, const char directory)
255	nmav	1.1	{
256			word32 ret;
257			lt_dlhandle *_handle;
258			int (*_version) (void);
259
260	nmav	1.3	if (file == NULL && directory == NULL) {
261	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
262			}
263
264	nmav	1.3	if (lt_dlinit() != 0) {
265	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
266	nmav	1.3	}
267	nmav	1.1	/* LTDL_SET_PRELOADED_SYMBOLS(); */
268	nmav	1.3
269	nmav	1.2	_handle = mcrypt_dlopen(directory, NULL, file);
270	nmav	1.3
271	nmav	1.1	if (!_handle) {
272			lt_dlexit();
273			return MCRYPT_UNKNOWN_ERROR;
274			}
275	nmav	1.3
276	nmav	1.1
277			_version = lt_dlsym(_handle, "_mcrypt_mode_version");
278
279	nmav	1.3	if (_version == NULL) {
280	nmav	1.1	lt_dlclose(_handle);
281			lt_dlexit();
282			return MCRYPT_UNKNOWN_ERROR;
283			}
284	nmav	1.3
285	nmav	1.1	ret = _version();
286
287			lt_dlclose(_handle);
288			lt_dlexit();
289
290			return ret;
291
292			}
293	nmav	1.8
294			/* Taken from libgcrypt */
295
296			static const char*
297			parse_version_number( const char s, int number )
298			{
299			int val = 0;
300
301			if( *s == '0' && isdigit(s[1]) )
302			return NULL; /* leading zeros are not allowed */
303			for ( ; isdigit(*s); s++ ) {
304			val *= 10;
305			val += *s - '0';
306			}
307			*number = val;
308			return val < 0? NULL : s;
309			}
310
311
312			static const char *
313			parse_version_string( const char s, int major, int minor, int micro )
314			{
315			s = parse_version_number( s, major );
316			if( !s \|\| *s != '.' )
317			return NULL;
318			s++;
319			s = parse_version_number( s, minor );
320			if( !s \|\| *s != '.' )
321			return NULL;
322			s++;
323			s = parse_version_number( s, micro );
324			if( !s )
325			return NULL;
326			return s; /* patchlevel */
327			}
328
329			/****************
330			* Check that the the version of the library is at minimum the requested one
331			* and return the version string; return NULL if the condition is not
332			* satisfied. If a NULL is passed to this function, no check is done,
333			* but the version string is simply returned.
334			*/
335			const char *
336			mcrypt_check_version( const char *req_version )
337			{
338			const char *ver = VERSION;
339			int my_major, my_minor, my_micro;
340			int rq_major, rq_minor, rq_micro;
341			const char my_plvl, rq_plvl;
342
343			if ( !req_version )
344			return ver;
345
346			my_plvl = parse_version_string( ver, &my_major, &my_minor, &my_micro );
347			if ( !my_plvl )
348			return NULL; /* very strange our own version is bogus */
349			rq_plvl = parse_version_string( req_version, &rq_major, &rq_minor,
350			&rq_micro );
351			if ( !rq_plvl )
352			return NULL; /* req version string is invalid */
353
354			if ( my_major > rq_major
355			\|\| (my_major == rq_major && my_minor > rq_minor)
356			\|\| (my_major == rq_major && my_minor == rq_minor
357			&& my_micro > rq_micro)
358			\|\| (my_major == rq_major && my_minor == rq_minor
359			&& my_micro == rq_micro
360			&& strcmp( my_plvl, rq_plvl ) >= 0) ) {
361			return ver;
362			}
363			return NULL;
364			}
365