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 1.9 2001/05/16 12:27:20 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) {
                                                free(dirname);
                                                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 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) {
                                                free(dirname);
                                                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	1.10	/* $Id: mcrypt_extra.c,v 1.9 2001/05/16 12:27:20 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	1.10	if (filename==NULL) {
113			free(dirname);
114			return NULL;
115			}
116	nmav	1.6	filename[*size] =
117			calloc(1, tmpsize + 1);
118	nmav	1.7	if (filename[*size]==NULL) return NULL;
119	nmav	1.6	strcpy(filename[*size], dirname);
120	nmav	1.10
121	nmav	1.6	ptr =
122			strrchr(filename[*size], '.');
123	nmav	1.3	if (ptr != NULL)
124			*ptr = '\0';
125			(*size)++;
126	nmav	1.1	}
127	nmav	1.3	}
128	nmav	1.10	free(dirname);
129	nmav	1.1	} else {
130			break;
131			}
132
133			}
134
135
136	nmav	1.3	closedir(pdir);
137	nmav	1.1
138			return filename;
139
140			}
141
142	nmav	1.6	WIN32DLL_DEFINE char *mcrypt_list_modes(char libdir, int *size)
143	nmav	1.1	{
144			DIR *pdir;
145	nmav	1.2	char directory[512];
146	nmav	1.6	char *dirname;
147	nmav	1.1	char *filename = NULL, ptr;
148			int tmpsize;
149
150			if (libdir == NULL) {
151			strcpy(directory, LIBDIR);
152			} else {
153			strcpy(directory, libdir);
154			}
155
156			pdir = opendir(directory);
157			if (pdir == NULL) {
158			fprintf(stderr, "Unable to open directory %s.\n",
159			directory);
160			return NULL;
161			}
162
163			*size = 0;
164			for (;;) {
165
166	nmav	1.2	dirname = mcrypt_readdir(pdir);
167	nmav	1.1	if (dirname != NULL) {
168	nmav	1.6	tmpsize = strlen(dirname);
169			if (tmpsize > 3) {
170			if (mcrypt_mode_module_ok
171			(dirname, directory) > 0) {
172			filename =
173			realloc(filename,
174			(*size +
175			1) * sizeof(char *));
176	nmav	1.10	if (filename==NULL) {
177			free(dirname);
178			return NULL;
179			}
180	nmav	1.6	filename[*size] =
181			calloc(1, tmpsize + 1);
182	nmav	1.7	if (filename[*size]==NULL) return NULL;
183
184	nmav	1.6	strcpy(filename[*size], dirname);
185			ptr =
186			strrchr(filename[*size], '.');
187			if (ptr != NULL)
188			*ptr = '\0';
189			(*size)++;
190	nmav	1.1	}
191			}
192	nmav	1.6	free(dirname);
193	nmav	1.1	} else {
194			break;
195			}
196
197			}
198
199			closedir(pdir);
200			return filename;
201			}
202
203	nmav	1.6	WIN32DLL_DEFINE void mcrypt_free_p(char **p, int size)
204	nmav	1.3	{
205			int i;
206	nmav	1.1
207	nmav	1.3	for (i = 0; i < size; i++) {
208	nmav	1.1	free(p[i]);
209			}
210			free(p);
211			}
212
213	nmav	1.5	WIN32DLL_DEFINE
214	nmav	1.6	int mcrypt_algorithm_module_ok(const char file, const char directory)
215	nmav	1.1	{
216			word32 ret;
217	nmav	1.9	lt_dlhandle _handle;
218	nmav	1.1	int (*_version) (void);
219
220	nmav	1.3	if (file == NULL && directory == NULL) {
221	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
222			}
223	nmav	1.4
224	nmav	1.3	if (lt_dlinit() != 0) {
225	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
226			}
227	nmav	1.4
228	nmav	1.3
229	nmav	1.2	/* LTDL_SET_PRELOADED_SYMBOLS(); */
230	nmav	1.3
231	nmav	1.2	_handle = mcrypt_dlopen(directory, NULL, file);
232	nmav	1.1
233			if (!_handle) {
234			/* fputs(lt_dlerror(), stderr);
235			* fputs("\n", stderr);
236			*/
237			lt_dlexit();
238			return MCRYPT_UNKNOWN_ERROR;
239			}
240
241
242			_version = lt_dlsym(_handle, "_mcrypt_algorithm_version");
243
244	nmav	1.3	if (_version == NULL) {
245	nmav	1.1	lt_dlclose(_handle);
246			lt_dlexit();
247			return MCRYPT_UNKNOWN_ERROR;
248			}
249
250			ret = _version();
251
252			lt_dlclose(_handle);
253			lt_dlexit();
254
255			return ret;
256
257			}
258
259	nmav	1.5	WIN32DLL_DEFINE
260	nmav	1.6	int mcrypt_mode_module_ok(const char file, const char directory)
261	nmav	1.1	{
262			word32 ret;
263	nmav	1.9	lt_dlhandle _handle;
264	nmav	1.1	int (*_version) (void);
265
266	nmav	1.3	if (file == NULL && directory == NULL) {
267	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
268			}
269
270	nmav	1.3	if (lt_dlinit() != 0) {
271	nmav	1.1	return MCRYPT_UNKNOWN_ERROR;
272	nmav	1.3	}
273	nmav	1.1	/* LTDL_SET_PRELOADED_SYMBOLS(); */
274	nmav	1.3
275	nmav	1.2	_handle = mcrypt_dlopen(directory, NULL, file);
276	nmav	1.3
277	nmav	1.1	if (!_handle) {
278			lt_dlexit();
279			return MCRYPT_UNKNOWN_ERROR;
280			}
281	nmav	1.3
282	nmav	1.1
283			_version = lt_dlsym(_handle, "_mcrypt_mode_version");
284
285	nmav	1.3	if (_version == NULL) {
286	nmav	1.1	lt_dlclose(_handle);
287			lt_dlexit();
288			return MCRYPT_UNKNOWN_ERROR;
289			}
290	nmav	1.3
291	nmav	1.1	ret = _version();
292
293			lt_dlclose(_handle);
294			lt_dlexit();
295
296			return ret;
297
298			}
299	nmav	1.8
300			/* Taken from libgcrypt */
301
302			static const char*
303			parse_version_number( const char s, int number )
304			{
305			int val = 0;
306
307			if( *s == '0' && isdigit(s[1]) )
308			return NULL; /* leading zeros are not allowed */
309			for ( ; isdigit(*s); s++ ) {
310			val *= 10;
311			val += *s - '0';
312			}
313			*number = val;
314			return val < 0? NULL : s;
315			}
316
317
318			static const char *
319			parse_version_string( const char s, int major, int minor, int micro )
320			{
321			s = parse_version_number( s, major );
322			if( !s \|\| *s != '.' )
323			return NULL;
324			s++;
325			s = parse_version_number( s, minor );
326			if( !s \|\| *s != '.' )
327			return NULL;
328			s++;
329			s = parse_version_number( s, micro );
330			if( !s )
331			return NULL;
332			return s; /* patchlevel */
333			}
334
335			/****************
336			* Check that the the version of the library is at minimum the requested one
337			* and return the version string; return NULL if the condition is not
338			* satisfied. If a NULL is passed to this function, no check is done,
339			* but the version string is simply returned.
340			*/
341			const char *
342			mcrypt_check_version( const char *req_version )
343			{
344			const char *ver = VERSION;
345			int my_major, my_minor, my_micro;
346			int rq_major, rq_minor, rq_micro;
347			const char my_plvl, rq_plvl;
348
349			if ( !req_version )
350			return ver;
351
352			my_plvl = parse_version_string( ver, &my_major, &my_minor, &my_micro );
353			if ( !my_plvl )
354			return NULL; /* very strange our own version is bogus */
355			rq_plvl = parse_version_string( req_version, &rq_major, &rq_minor,
356			&rq_micro );
357			if ( !rq_plvl )
358			return NULL; /* req version string is invalid */
359
360			if ( my_major > rq_major
361			\|\| (my_major == rq_major && my_minor > rq_minor)
362			\|\| (my_major == rq_major && my_minor == rq_minor
363			&& my_micro > rq_micro)
364			\|\| (my_major == rq_major && my_minor == rq_minor
365			&& my_micro == rq_micro
366			&& strcmp( my_plvl, rq_plvl ) >= 0) ) {
367			return ver;
368			}
369			return NULL;
370			}
371