crypto/rand/rand_egd.c

   1 /* crypto/rand/rand_egd.c */
   2 /* Written by Ulf Moeller 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/rand.h>
  58
  59 /* Query the EGD <URL: http://www.lothar.com/tech/crypto/>.
  60  */
  61
  62 #if defined(WIN32) || defined(VMS) || defined(__VMS)
  63 int RAND_egd(const char *path)
  64         {
  65         return(-1);
  66         }
  67 #else
  68 #include <openssl/opensslconf.h>
  69 #include OPENSSL_UNISTD
  70 #include <sys/types.h>
  71 #include <sys/socket.h>
  72 #include <sys/un.h>
  73
  74 #ifndef offsetof
  75 #  define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  76 #endif
  77
  78 int RAND_egd(const char *path)
  79         {
  80         int ret = -1;
  81         struct sockaddr_un addr;
  82         int len, num;
  83         int fd = -1;
  84         unsigned char buf[256];
  85
  86         memset(&addr, 0, sizeof(addr));
  87         addr.sun_family = AF_UNIX;
  88         if (strlen(path) > sizeof(addr.sun_path))
  89                 return (-1);
  90         strcpy(addr.sun_path,path);
  91         len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
  92         fd = socket(AF_UNIX, SOCK_STREAM, 0);
  93         if (fd == -1) return (-1);
  94         if (connect(fd, (struct sockaddr *)&addr, len) == -1) goto err;
  95         buf[0] = 1;
  96         buf[1] = 255;
  97         write(fd, buf, 2);
  98         if (read(fd, buf, 1) != 1) goto err;
  99     if (buf[0] == 0) goto err;
 100         num = read(fd, buf, 255);
 101         if (num < 1) goto err;
 102         RAND_seed(buf, num);
 103         if (RAND_status() == 1)
 104                 ret = num;
 105  err:
 106         if (fd != -1) close(fd);
 107         return(ret);
 108         }
 109 #endif