bss_fd.c revision 109998
1/* crypto/bio/bss_fd.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <stdio.h> 60#include <errno.h> 61#define USE_SOCKETS 62#include "cryptlib.h" 63#include <openssl/bio.h> 64 65static int fd_write(BIO *h, const char *buf, int num); 66static int fd_read(BIO *h, char *buf, int size); 67static int fd_puts(BIO *h, const char *str); 68static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 69static int fd_new(BIO *h); 70static int fd_free(BIO *data); 71int BIO_fd_should_retry(int s); 72 73static BIO_METHOD methods_fdp= 74 { 75 BIO_TYPE_FD,"file descriptor", 76 fd_write, 77 fd_read, 78 fd_puts, 79 NULL, /* fd_gets, */ 80 fd_ctrl, 81 fd_new, 82 fd_free, 83 NULL, 84 }; 85 86BIO_METHOD *BIO_s_fd(void) 87 { 88 return(&methods_fdp); 89 } 90 91BIO *BIO_new_fd(int fd,int close_flag) 92 { 93 BIO *ret; 94 ret=BIO_new(BIO_s_fd()); 95 if (ret == NULL) return(NULL); 96 BIO_set_fd(ret,fd,close_flag); 97 return(ret); 98 } 99 100static int fd_new(BIO *bi) 101 { 102 bi->init=0; 103 bi->num=0; 104 bi->ptr=NULL; 105 bi->flags=0; 106 return(1); 107 } 108 109static int fd_free(BIO *a) 110 { 111 if (a == NULL) return(0); 112 if (a->shutdown) 113 { 114 if (a->init) 115 { 116 close(a->num); 117 } 118 a->init=0; 119 a->flags=0; 120 } 121 return(1); 122 } 123 124static int fd_read(BIO *b, char *out,int outl) 125 { 126 int ret=0; 127 128 if (out != NULL) 129 { 130 clear_sys_error(); 131 ret=read(b->num,out,outl); 132 BIO_clear_retry_flags(b); 133 if (ret <= 0) 134 { 135 if (BIO_fd_should_retry(ret)) 136 BIO_set_retry_read(b); 137 } 138 } 139 return(ret); 140 } 141 142static int fd_write(BIO *b, const char *in, int inl) 143 { 144 int ret; 145 clear_sys_error(); 146 ret=write(b->num,in,inl); 147 BIO_clear_retry_flags(b); 148 if (ret <= 0) 149 { 150 if (BIO_fd_should_retry(ret)) 151 BIO_set_retry_write(b); 152 } 153 return(ret); 154 } 155 156static long fd_ctrl(BIO *b, int cmd, long num, void *ptr) 157 { 158 long ret=1; 159 int *ip; 160 161 switch (cmd) 162 { 163 case BIO_CTRL_RESET: 164 num=0; 165 case BIO_C_FILE_SEEK: 166 ret=(long)lseek(b->num,num,0); 167 break; 168 case BIO_C_FILE_TELL: 169 case BIO_CTRL_INFO: 170 ret=(long)lseek(b->num,0,1); 171 break; 172 case BIO_C_SET_FD: 173 fd_free(b); 174 b->num= *((int *)ptr); 175 b->shutdown=(int)num; 176 b->init=1; 177 break; 178 case BIO_C_GET_FD: 179 if (b->init) 180 { 181 ip=(int *)ptr; 182 if (ip != NULL) *ip=b->num; 183 ret=b->num; 184 } 185 else 186 ret= -1; 187 break; 188 case BIO_CTRL_GET_CLOSE: 189 ret=b->shutdown; 190 break; 191 case BIO_CTRL_SET_CLOSE: 192 b->shutdown=(int)num; 193 break; 194 case BIO_CTRL_PENDING: 195 case BIO_CTRL_WPENDING: 196 ret=0; 197 break; 198 case BIO_CTRL_DUP: 199 case BIO_CTRL_FLUSH: 200 ret=1; 201 break; 202 default: 203 ret=0; 204 break; 205 } 206 return(ret); 207 } 208 209static int fd_puts(BIO *bp, const char *str) 210 { 211 int n,ret; 212 213 n=strlen(str); 214 ret=fd_write(bp,str,n); 215 return(ret); 216 } 217 218int BIO_fd_should_retry(int i) 219 { 220 int err; 221 222 if ((i == 0) || (i == -1)) 223 { 224 err=get_last_sys_error(); 225 226#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */ 227 if ((i == -1) && (err == 0)) 228 return(1); 229#endif 230 231 return(BIO_fd_non_fatal_error(err)); 232 } 233 return(0); 234 } 235 236int BIO_fd_non_fatal_error(int err) 237 { 238 switch (err) 239 { 240 241#ifdef EWOULDBLOCK 242# ifdef WSAEWOULDBLOCK 243# if WSAEWOULDBLOCK != EWOULDBLOCK 244 case EWOULDBLOCK: 245# endif 246# else 247 case EWOULDBLOCK: 248# endif 249#endif 250 251#if defined(ENOTCONN) 252 case ENOTCONN: 253#endif 254 255#ifdef EINTR 256 case EINTR: 257#endif 258 259#ifdef EAGAIN 260#if EWOULDBLOCK != EAGAIN 261 case EAGAIN: 262# endif 263#endif 264 265#ifdef EPROTO 266 case EPROTO: 267#endif 268 269#ifdef EINPROGRESS 270 case EINPROGRESS: 271#endif 272 273#ifdef EALREADY 274 case EALREADY: 275#endif 276 return(1); 277 /* break; */ 278 default: 279 break; 280 } 281 return(0); 282 } 283