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//asq: 99//#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) || defined(OPENSSL_SYS_BEOS) 100#if 1 101int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) 102 { 103 return(-1); 104 } 105int RAND_egd(const char *path) 106 { 107 return(-1); 108 } 109 110int RAND_egd_bytes(const char *path,int bytes) 111 { 112 return(-1); 113 } 114#else 115#include <openssl/opensslconf.h> 116#include OPENSSL_UNISTD 117#include <sys/types.h> 118#include <sys/socket.h> 119#ifndef NO_SYS_UN_H 120# ifdef OPENSSL_SYS_VXWORKS 121# include <streams/un.h> 122# else 123# include <sys/un.h> 124# endif 125#else 126struct sockaddr_un { 127 short sun_family; /* AF_UNIX */ 128 char sun_path[108]; /* path name (gag) */ 129}; 130#endif /* NO_SYS_UN_H */ 131#include <string.h> 132#include <errno.h> 133 134#ifndef offsetof 135# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 136#endif 137 138int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) 139 { 140 int ret = 0; 141 struct sockaddr_un addr; 142 int len, num, numbytes; 143 int fd = -1; 144 int success; 145 unsigned char egdbuf[2], tempbuf[255], *retrievebuf; 146 147 memset(&addr, 0, sizeof(addr)); 148 addr.sun_family = AF_UNIX; 149 if (strlen(path) >= sizeof(addr.sun_path)) 150 return (-1); 151 BUF_strlcpy(addr.sun_path,path,sizeof addr.sun_path); 152 len = offsetof(struct sockaddr_un, sun_path) + strlen(path); 153 fd = socket(AF_UNIX, SOCK_STREAM, 0); 154 if (fd == -1) return (-1); 155 success = 0; 156 while (!success) 157 { 158 if (connect(fd, (struct sockaddr *)&addr, len) == 0) 159 success = 1; 160 else 161 { 162 switch (errno) 163 { 164#ifdef EINTR 165 case EINTR: 166#endif 167#ifdef EAGAIN 168 case EAGAIN: 169#endif 170#ifdef EINPROGRESS 171 case EINPROGRESS: 172#endif 173#ifdef EALREADY 174 case EALREADY: 175#endif 176 /* No error, try again */ 177 break; 178#ifdef EISCONN 179 case EISCONN: 180 success = 1; 181 break; 182#endif 183 default: 184 goto err; /* failure */ 185 } 186 } 187 } 188 189 while(bytes > 0) 190 { 191 egdbuf[0] = 1; 192 egdbuf[1] = bytes < 255 ? bytes : 255; 193 numbytes = 0; 194 while (numbytes != 2) 195 { 196 num = write(fd, egdbuf + numbytes, 2 - numbytes); 197 if (num >= 0) 198 numbytes += num; 199 else 200 { 201 switch (errno) 202 { 203#ifdef EINTR 204 case EINTR: 205#endif 206#ifdef EAGAIN 207 case EAGAIN: 208#endif 209 /* No error, try again */ 210 break; 211 default: 212 ret = -1; 213 goto err; /* failure */ 214 } 215 } 216 } 217 numbytes = 0; 218 while (numbytes != 1) 219 { 220 num = read(fd, egdbuf, 1); 221 if (num == 0) 222 goto err; /* descriptor closed */ 223 else if (num > 0) 224 numbytes += num; 225 else 226 { 227 switch (errno) 228 { 229#ifdef EINTR 230 case EINTR: 231#endif 232#ifdef EAGAIN 233 case EAGAIN: 234#endif 235 /* No error, try again */ 236 break; 237 default: 238 ret = -1; 239 goto err; /* failure */ 240 } 241 } 242 } 243 if(egdbuf[0] == 0) 244 goto err; 245 if (buf) 246 retrievebuf = buf + ret; 247 else 248 retrievebuf = tempbuf; 249 numbytes = 0; 250 while (numbytes != egdbuf[0]) 251 { 252 num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes); 253 if (num == 0) 254 goto err; /* descriptor closed */ 255 else if (num > 0) 256 numbytes += num; 257 else 258 { 259 switch (errno) 260 { 261#ifdef EINTR 262 case EINTR: 263#endif 264#ifdef EAGAIN 265 case EAGAIN: 266#endif 267 /* No error, try again */ 268 break; 269 default: 270 ret = -1; 271 goto err; /* failure */ 272 } 273 } 274 } 275 ret += egdbuf[0]; 276 bytes -= egdbuf[0]; 277 if (!buf) 278 RAND_seed(tempbuf, egdbuf[0]); 279 } 280 err: 281 if (fd != -1) close(fd); 282 return(ret); 283 } 284 285 286int RAND_egd_bytes(const char *path, int bytes) 287 { 288 int num, ret = 0; 289 290 num = RAND_query_egd_bytes(path, NULL, bytes); 291 if (num < 1) goto err; 292 if (RAND_status() == 1) 293 ret = num; 294 err: 295 return(ret); 296 } 297 298 299int RAND_egd(const char *path) 300 { 301 return (RAND_egd_bytes(path, 255)); 302 } 303 304 305#endif 306