source: trunk/sys/libcrypto/others/rand_egd.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/* crypto/rand/rand_egd.c */
2/* Written by Ulf Moeller and Lutz Jaenicke for the OpenSSL project. */
3/* ====================================================================
4 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in
15 *    the documentation and/or other materials provided with the
16 *    distribution.
17 *
18 * 3. All advertising materials mentioning features or use of this
19 *    software must display the following acknowledgment:
20 *    "This product includes software developed by the OpenSSL Project
21 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 *
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 *    endorse or promote products derived from this software without
25 *    prior written permission. For written permission, please contact
26 *    openssl-core@openssl.org.
27 *
28 * 5. Products derived from this software may not be called "OpenSSL"
29 *    nor may "OpenSSL" appear in their names without prior written
30 *    permission of the OpenSSL Project.
31 *
32 * 6. Redistributions of any form whatsoever must retain the following
33 *    acknowledgment:
34 *    "This product includes software developed by the OpenSSL Project
35 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This product includes cryptographic software written by Eric Young
52 * (eay@cryptsoft.com).  This product includes software written by Tim
53 * Hudson (tjh@cryptsoft.com).
54 *
55 */
56
57#include <openssl/e_os2.h>
58#include <openssl/rand.h>
59#include <openssl/buffer.h>
60
61/*
62 * Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
63 *
64 * This module supplies three routines:
65 *
66 * RAND_query_egd_bytes(path, buf, bytes)
67 *   will actually query "bytes" bytes of entropy form the egd-socket located
68 *   at path and will write them to buf (if supplied) or will directly feed
69 *   it to RAND_seed() if buf==NULL.
70 *   The number of bytes is not limited by the maximum chunk size of EGD,
71 *   which is 255 bytes. If more than 255 bytes are wanted, several chunks
72 *   of entropy bytes are requested. The connection is left open until the
73 *   query is competed.
74 *   RAND_query_egd_bytes() returns with
75 *     -1  if an error occured during connection or communication.
76 *     num the number of bytes read from the EGD socket. This number is either
77 *         the number of bytes requested or smaller, if the EGD pool is
78 *         drained and the daemon signals that the pool is empty.
79 *   This routine does not touch any RAND_status(). This is necessary, since
80 *   PRNG functions may call it during initialization.
81 *
82 * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them
83 *   used to seed the PRNG.
84 *   RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL.
85 *   Unlike RAND_query_egd_bytes(), RAND_status() is used to test the
86 *   seed status so that the return value can reflect the seed state:
87 *     -1  if an error occured during connection or communication _or_
88 *         if the PRNG has still not received the required seeding.
89 *     num the number of bytes read from the EGD socket. This number is either
90 *         the number of bytes requested or smaller, if the EGD pool is
91 *         drained and the daemon signals that the pool is empty.
92 *
93 * RAND_egd(path) will query 255 bytes and use the bytes retreived to seed
94 *   the PRNG.
95 *   RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255.
96 */
97
98#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE) || defined(OPENSSL_SYS_VOS)
99int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
100        {
101        return(-1);
102        }
103int RAND_egd(const char *path)
104        {
105        return(-1);
106        }
107
108int RAND_egd_bytes(const char *path,int bytes)
109        {
110        return(-1);
111        }
112#else
113#include <openssl/opensslconf.h>
114#include OPENSSL_UNISTD
115#include <sys/types.h>
116#include <sys/socket.h>
117#ifndef NO_SYS_UN_H
118# ifdef OPENSSL_SYS_VXWORKS
119#   include <streams/un.h>
120# else
121#   include <sys/un.h>
122# endif
123#else
124struct  sockaddr_un {
125        short   sun_family;             /* AF_UNIX */
126        char    sun_path[108];          /* path name (gag) */
127};
128#endif /* NO_SYS_UN_H */
129#include <string.h>
130#include <errno.h>
131
132#ifndef offsetof
133#  define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
134#endif
135
136int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes)
137        {
138        int ret = 0;
139        struct sockaddr_un addr;
140        int len, num, numbytes;
141        int fd = -1;
142        int success;
143        unsigned char egdbuf[2], tempbuf[255], *retrievebuf;
144
145        memset(&addr, 0, sizeof(addr));
146        addr.sun_family = AF_UNIX;
147        if (strlen(path) >= sizeof(addr.sun_path))
148                return (-1);
149        BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path);
150        len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
151        fd = socket(AF_UNIX, SOCK_STREAM, 0);
152        if (fd == -1) return (-1);
153        success = 0;
154        while (!success)
155            {
156            if (connect(fd, (struct sockaddr *)&addr, len) == 0)
157               success = 1;
158            else
159                {
160                switch (errno)
161                    {
162#ifdef EINTR
163                    case EINTR:
164#endif
165#ifdef EAGAIN
166                    case EAGAIN:
167#endif
168#ifdef EINPROGRESS
169                    case EINPROGRESS:
170#endif
171#ifdef EALREADY
172                    case EALREADY:
173#endif
174                        /* No error, try again */
175                        break;
176#ifdef EISCONN
177                    case EISCONN:
178                        success = 1;
179                        break;
180#endif
181                    default:
182                        goto err;       /* failure */
183                    }
184                }
185            }
186
187        while(bytes > 0)
188            {
189            egdbuf[0] = 1;
190            egdbuf[1] = bytes < 255 ? bytes : 255;
191            numbytes = 0;
192            while (numbytes != 2)
193                {
194                num = write(fd, egdbuf + numbytes, 2 - numbytes);
195                if (num >= 0)
196                    numbytes += num;
197                else
198                    {
199                    switch (errno)
200                        {
201#ifdef EINTR
202                        case EINTR:
203#endif
204#ifdef EAGAIN
205                        case EAGAIN:
206#endif
207                            /* No error, try again */
208                            break;
209                        default:
210                            ret = -1;
211                            goto err;   /* failure */
212                        }
213                    }
214                }
215            numbytes = 0;
216            while (numbytes != 1)
217                {
218                num = read(fd, egdbuf, 1);
219                if (num == 0)
220                        goto err;       /* descriptor closed */
221                else if (num > 0)
222                    numbytes += num;
223                else
224                    {
225                    switch (errno)
226                        {
227#ifdef EINTR
228                        case EINTR:
229#endif
230#ifdef EAGAIN
231                        case EAGAIN:
232#endif
233                            /* No error, try again */
234                            break;
235                        default:
236                            ret = -1;
237                            goto err;   /* failure */
238                        }
239                    }
240                }
241            if(egdbuf[0] == 0)
242                goto err;
243            if (buf)
244                retrievebuf = buf + ret;
245            else
246                retrievebuf = tempbuf;
247            numbytes = 0;
248            while (numbytes != egdbuf[0])
249                {
250                num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes);
251                if (num == 0)
252                        goto err;       /* descriptor closed */
253                else if (num > 0)
254                    numbytes += num;
255                else
256                    {
257                    switch (errno)
258                        {
259#ifdef EINTR
260                        case EINTR:
261#endif
262#ifdef EAGAIN
263                        case EAGAIN:
264#endif
265                            /* No error, try again */
266                            break;
267                        default:
268                            ret = -1;
269                            goto err;   /* failure */
270                        }
271                    }
272                }
273            ret += egdbuf[0];
274            bytes -= egdbuf[0];
275            if (!buf)
276                RAND_seed(tempbuf, egdbuf[0]);
277            }
278 err:
279        if (fd != -1) close(fd);
280        return(ret);
281        }
282
283
284int RAND_egd_bytes(const char *path, int bytes)
285        {
286        int num, ret = 0;
287
288        num = RAND_query_egd_bytes(path, NULL, bytes);
289        if (num < 1) goto err;
290        if (RAND_status() == 1)
291            ret = num;
292 err:
293        return(ret);
294        }
295
296
297int RAND_egd(const char *path)
298        {
299        return (RAND_egd_bytes(path, 255));
300        }
301
302
303#endif
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