bss_fd.c revision 656d9c7f52f88b3a3daccafa7655dec086c4756e
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/* 64 * As for unconditional usage of "UPLINK" interface in this module. 65 * Trouble is that unlike Unix file descriptors [which are indexes 66 * in kernel-side per-process table], corresponding descriptors on 67 * platforms which require "UPLINK" interface seem to be indexes 68 * in a user-land, non-global table. Well, in fact they are indexes 69 * in stdio _iob[], and recall that _iob[] was the very reason why 70 * "UPLINK" interface was introduced in first place. But one way on 71 * another. Neither libcrypto or libssl use this BIO meaning that 72 * file descriptors can only be provided by application. Therefore 73 * "UPLINK" calls are due... 74 */ 75#include "bio_lcl.h" 76 77static int fd_write(BIO *h, const char *buf, int num); 78static int fd_read(BIO *h, char *buf, int size); 79static int fd_puts(BIO *h, const char *str); 80static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 81static int fd_new(BIO *h); 82static int fd_free(BIO *data); 83int BIO_fd_should_retry(int s); 84 85static BIO_METHOD methods_fdp= 86 { 87 BIO_TYPE_FD,"file descriptor", 88 fd_write, 89 fd_read, 90 fd_puts, 91 NULL, /* fd_gets, */ 92 fd_ctrl, 93 fd_new, 94 fd_free, 95 NULL, 96 }; 97 98BIO_METHOD *BIO_s_fd(void) 99 { 100 return(&methods_fdp); 101 } 102 103BIO *BIO_new_fd(int fd,int close_flag) 104 { 105 BIO *ret; 106 ret=BIO_new(BIO_s_fd()); 107 if (ret == NULL) return(NULL); 108 BIO_set_fd(ret,fd,close_flag); 109 return(ret); 110 } 111 112static int fd_new(BIO *bi) 113 { 114 bi->init=0; 115 bi->num=-1; 116 bi->ptr=NULL; 117 bi->flags=BIO_FLAGS_UPLINK; /* essentially redundant */ 118 return(1); 119 } 120 121static int fd_free(BIO *a) 122 { 123 if (a == NULL) return(0); 124 if (a->shutdown) 125 { 126 if (a->init) 127 { 128 UP_close(a->num); 129 } 130 a->init=0; 131 a->flags=BIO_FLAGS_UPLINK; 132 } 133 return(1); 134 } 135 136static int fd_read(BIO *b, char *out,int outl) 137 { 138 int ret=0; 139 140 if (out != NULL) 141 { 142 clear_sys_error(); 143 ret=UP_read(b->num,out,outl); 144 BIO_clear_retry_flags(b); 145 if (ret <= 0) 146 { 147 if (BIO_fd_should_retry(ret)) 148 BIO_set_retry_read(b); 149 } 150 } 151 return(ret); 152 } 153 154static int fd_write(BIO *b, const char *in, int inl) 155 { 156 int ret; 157 clear_sys_error(); 158 ret=UP_write(b->num,in,inl); 159 BIO_clear_retry_flags(b); 160 if (ret <= 0) 161 { 162 if (BIO_fd_should_retry(ret)) 163 BIO_set_retry_write(b); 164 } 165 return(ret); 166 } 167 168static long fd_ctrl(BIO *b, int cmd, long num, void *ptr) 169 { 170 long ret=1; 171 int *ip; 172 173 switch (cmd) 174 { 175 case BIO_CTRL_RESET: 176 num=0; 177 case BIO_C_FILE_SEEK: 178 ret=(long)UP_lseek(b->num,num,0); 179 break; 180 case BIO_C_FILE_TELL: 181 case BIO_CTRL_INFO: 182 ret=(long)UP_lseek(b->num,0,1); 183 break; 184 case BIO_C_SET_FD: 185 fd_free(b); 186 b->num= *((int *)ptr); 187 b->shutdown=(int)num; 188 b->init=1; 189 break; 190 case BIO_C_GET_FD: 191 if (b->init) 192 { 193 ip=(int *)ptr; 194 if (ip != NULL) *ip=b->num; 195 ret=b->num; 196 } 197 else 198 ret= -1; 199 break; 200 case BIO_CTRL_GET_CLOSE: 201 ret=b->shutdown; 202 break; 203 case BIO_CTRL_SET_CLOSE: 204 b->shutdown=(int)num; 205 break; 206 case BIO_CTRL_PENDING: 207 case BIO_CTRL_WPENDING: 208 ret=0; 209 break; 210 case BIO_CTRL_DUP: 211 case BIO_CTRL_FLUSH: 212 ret=1; 213 break; 214 default: 215 ret=0; 216 break; 217 } 218 return(ret); 219 } 220 221static int fd_puts(BIO *bp, const char *str) 222 { 223 int n,ret; 224 225 n=strlen(str); 226 ret=fd_write(bp,str,n); 227 return(ret); 228 } 229 230int BIO_fd_should_retry(int i) 231 { 232 int err; 233 234 if ((i == 0) || (i == -1)) 235 { 236 err=get_last_sys_error(); 237 238#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */ 239 if ((i == -1) && (err == 0)) 240 return(1); 241#endif 242 243 return(BIO_fd_non_fatal_error(err)); 244 } 245 return(0); 246 } 247 248int BIO_fd_non_fatal_error(int err) 249 { 250 switch (err) 251 { 252 253#ifdef EWOULDBLOCK 254# ifdef WSAEWOULDBLOCK 255# if WSAEWOULDBLOCK != EWOULDBLOCK 256 case EWOULDBLOCK: 257# endif 258# else 259 case EWOULDBLOCK: 260# endif 261#endif 262 263#if defined(ENOTCONN) 264 case ENOTCONN: 265#endif 266 267#ifdef EINTR 268 case EINTR: 269#endif 270 271#ifdef EAGAIN 272#if EWOULDBLOCK != EAGAIN 273 case EAGAIN: 274# endif 275#endif 276 277#ifdef EPROTO 278 case EPROTO: 279#endif 280 281#ifdef EINPROGRESS 282 case EINPROGRESS: 283#endif 284 285#ifdef EALREADY 286 case EALREADY: 287#endif 288 return(1); 289 /* break; */ 290 default: 291 break; 292 } 293 return(0); 294 } 295