rand_egd.c revision 59191
159191Skris/* crypto/rand/rand_egd.c */ 259191Skris/* Written by Ulf Moeller for the OpenSSL project. */ 359191Skris/* ==================================================================== 459191Skris * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. 559191Skris * 659191Skris * Redistribution and use in source and binary forms, with or without 759191Skris * modification, are permitted provided that the following conditions 859191Skris * are met: 959191Skris * 1059191Skris * 1. Redistributions of source code must retain the above copyright 1159191Skris * notice, this list of conditions and the following disclaimer. 1259191Skris * 1359191Skris * 2. Redistributions in binary form must reproduce the above copyright 1459191Skris * notice, this list of conditions and the following disclaimer in 1559191Skris * the documentation and/or other materials provided with the 1659191Skris * distribution. 1759191Skris * 1859191Skris * 3. All advertising materials mentioning features or use of this 1959191Skris * software must display the following acknowledgment: 2059191Skris * "This product includes software developed by the OpenSSL Project 2159191Skris * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 2259191Skris * 2359191Skris * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 2459191Skris * endorse or promote products derived from this software without 2559191Skris * prior written permission. For written permission, please contact 2659191Skris * openssl-core@openssl.org. 2759191Skris * 2859191Skris * 5. Products derived from this software may not be called "OpenSSL" 2959191Skris * nor may "OpenSSL" appear in their names without prior written 3059191Skris * permission of the OpenSSL Project. 3159191Skris * 3259191Skris * 6. Redistributions of any form whatsoever must retain the following 3359191Skris * acknowledgment: 3459191Skris * "This product includes software developed by the OpenSSL Project 3559191Skris * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 3659191Skris * 3759191Skris * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 3859191Skris * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3959191Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 4059191Skris * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 4159191Skris * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 4259191Skris * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 4359191Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 4459191Skris * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4559191Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4659191Skris * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 4759191Skris * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 4859191Skris * OF THE POSSIBILITY OF SUCH DAMAGE. 4959191Skris * ==================================================================== 5059191Skris * 5159191Skris * This product includes cryptographic software written by Eric Young 5259191Skris * (eay@cryptsoft.com). This product includes software written by Tim 5359191Skris * Hudson (tjh@cryptsoft.com). 5459191Skris * 5559191Skris */ 5659191Skris 5759191Skris#include <openssl/rand.h> 5859191Skris 5959191Skris/* Query the EGD <URL: http://www.lothar.com/tech/crypto/>. 6059191Skris */ 6159191Skris 6259191Skris#if defined(WIN32) || defined(VMS) || defined(__VMS) 6359191Skrisint RAND_egd(const char *path) 6459191Skris { 6559191Skris return(-1); 6659191Skris } 6759191Skris#else 6859191Skris#include <openssl/opensslconf.h> 6959191Skris#include OPENSSL_UNISTD 7059191Skris#include <sys/types.h> 7159191Skris#include <sys/socket.h> 7259191Skris#include <sys/un.h> 7359191Skris#include <string.h> 7459191Skris 7559191Skris#ifndef offsetof 7659191Skris# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 7759191Skris#endif 7859191Skris 7959191Skrisint RAND_egd(const char *path) 8059191Skris { 8159191Skris int ret = -1; 8259191Skris struct sockaddr_un addr; 8359191Skris int len, num; 8459191Skris int fd = -1; 8559191Skris unsigned char buf[256]; 8659191Skris 8759191Skris memset(&addr, 0, sizeof(addr)); 8859191Skris addr.sun_family = AF_UNIX; 8959191Skris if (strlen(path) > sizeof(addr.sun_path)) 9059191Skris return (-1); 9159191Skris strcpy(addr.sun_path,path); 9259191Skris len = offsetof(struct sockaddr_un, sun_path) + strlen(path); 9359191Skris fd = socket(AF_UNIX, SOCK_STREAM, 0); 9459191Skris if (fd == -1) return (-1); 9559191Skris if (connect(fd, (struct sockaddr *)&addr, len) == -1) goto err; 9659191Skris buf[0] = 1; 9759191Skris buf[1] = 255; 9859191Skris write(fd, buf, 2); 9959191Skris if (read(fd, buf, 1) != 1) goto err; 10059191Skris if (buf[0] == 0) goto err; 10159191Skris num = read(fd, buf, 255); 10259191Skris if (num < 1) goto err; 10359191Skris RAND_seed(buf, num); 10459191Skris if (RAND_status() == 1) 10559191Skris ret = num; 10659191Skris err: 10759191Skris if (fd != -1) close(fd); 10859191Skris return(ret); 10959191Skris } 11059191Skris#endif 111