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 #if defined(OPENSSL_NO_POSIX_IO) 65 /* 66 * One can argue that one should implement dummy placeholder for 67 * BIO_s_fd here... 68 */ 69 #else 70 /* 71 * As for unconditional usage of "UPLINK" interface in this module. 72 * Trouble is that unlike Unix file descriptors [which are indexes 73 * in kernel-side per-process table], corresponding descriptors on 74 * platforms which require "UPLINK" interface seem to be indexes 75 * in a user-land, non-global table. Well, in fact they are indexes 76 * in stdio _iob[], and recall that _iob[] was the very reason why 77 * "UPLINK" interface was introduced in first place. But one way on 78 * another. Neither libcrypto or libssl use this BIO meaning that 79 * file descriptors can only be provided by application. Therefore 80 * "UPLINK" calls are due... 81 */ 82 #include "bio_lcl.h" 83 84 static int fd_write(BIO *h, const char *buf, int num); 85 static int fd_read(BIO *h, char *buf, int size); 86 static int fd_puts(BIO *h, const char *str); 87 static int fd_gets(BIO *h, char *buf, int size); 88 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 89 static int fd_new(BIO *h); 90 static int fd_free(BIO *data); 91 int BIO_fd_should_retry(int s); 92 93 static BIO_METHOD methods_fdp= 94 { 95 BIO_TYPE_FD,"file descriptor", 96 fd_write, 97 fd_read, 98 fd_puts, 99 fd_gets, 100 fd_ctrl, 101 fd_new, 102 fd_free, 103 NULL, 104 }; 105 106 BIO_METHOD *BIO_s_fd(void) 107 { 108 return(&methods_fdp); 109 } 110 111 BIO *BIO_new_fd(int fd,int close_flag) 112 { 113 BIO *ret; 114 ret=BIO_new(BIO_s_fd()); 115 if (ret == NULL) return(NULL); 116 BIO_set_fd(ret,fd,close_flag); 117 return(ret); 118 } 119 120 static int fd_new(BIO *bi) 121 { 122 bi->init=0; 123 bi->num=-1; 124 bi->ptr=NULL; 125 bi->flags=BIO_FLAGS_UPLINK; /* essentially redundant */ 126 return(1); 127 } 128 129 static int fd_free(BIO *a) 130 { 131 if (a == NULL) return(0); 132 if (a->shutdown) 133 { 134 if (a->init) 135 { 136 UP_close(a->num); 137 } 138 a->init=0; 139 a->flags=BIO_FLAGS_UPLINK; 140 } 141 return(1); 142 } 143 144 static int fd_read(BIO *b, char *out,int outl) 145 { 146 int ret=0; 147 148 if (out != NULL) 149 { 150 clear_sys_error(); 151 ret=UP_read(b->num,out,outl); 152 BIO_clear_retry_flags(b); 153 if (ret <= 0) 154 { 155 if (BIO_fd_should_retry(ret)) 156 BIO_set_retry_read(b); 157 } 158 } 159 return(ret); 160 } 161 162 static int fd_write(BIO *b, const char *in, int inl) 163 { 164 int ret; 165 clear_sys_error(); 166 ret=UP_write(b->num,in,inl); 167 BIO_clear_retry_flags(b); 168 if (ret <= 0) 169 { 170 if (BIO_fd_should_retry(ret)) 171 BIO_set_retry_write(b); 172 } 173 return(ret); 174 } 175 176 static long fd_ctrl(BIO *b, int cmd, long num, void *ptr) 177 { 178 long ret=1; 179 int *ip; 180 181 switch (cmd) 182 { 183 case BIO_CTRL_RESET: 184 num=0; 185 case BIO_C_FILE_SEEK: 186 ret=(long)UP_lseek(b->num,num,0); 187 break; 188 case BIO_C_FILE_TELL: 189 case BIO_CTRL_INFO: 190 ret=(long)UP_lseek(b->num,0,1); 191 break; 192 case BIO_C_SET_FD: 193 fd_free(b); 194 b->num= *((int *)ptr); 195 b->shutdown=(int)num; 196 b->init=1; 197 break; 198 case BIO_C_GET_FD: 199 if (b->init) 200 { 201 ip=(int *)ptr; 202 if (ip != NULL) *ip=b->num; 203 ret=b->num; 204 } 205 else 206 ret= -1; 207 break; 208 case BIO_CTRL_GET_CLOSE: 209 ret=b->shutdown; 210 break; 211 case BIO_CTRL_SET_CLOSE: 212 b->shutdown=(int)num; 213 break; 214 case BIO_CTRL_PENDING: 215 case BIO_CTRL_WPENDING: 216 ret=0; 217 break; 218 case BIO_CTRL_DUP: 219 case BIO_CTRL_FLUSH: 220 ret=1; 221 break; 222 default: 223 ret=0; 224 break; 225 } 226 return(ret); 227 } 228 229 static int fd_puts(BIO *bp, const char *str) 230 { 231 int n,ret; 232 233 n=strlen(str); 234 ret=fd_write(bp,str,n); 235 return(ret); 236 } 237 238 static int fd_gets(BIO *bp, char *buf, int size) 239 { 240 int ret=0; 241 char *ptr=buf; 242 char *end=buf+size-1; 243 244 while ( (ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n') ) 245 ptr++; 246 247 ptr[0]='\0'; 248 249 if (buf[0] != '\0') 250 ret=strlen(buf); 251 return(ret); 252 } 253 254 int BIO_fd_should_retry(int i) 255 { 256 int err; 257 258 if ((i == 0) || (i == -1)) 259 { 260 err=get_last_sys_error(); 261 262 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */ 263 if ((i == -1) && (err == 0)) 264 return(1); 265 #endif 266 267 return(BIO_fd_non_fatal_error(err)); 268 } 269 return(0); 270 } 271 272 int BIO_fd_non_fatal_error(int err) 273 { 274 switch (err) 275 { 276 277 #ifdef EWOULDBLOCK 278 # ifdef WSAEWOULDBLOCK 279 # if WSAEWOULDBLOCK != EWOULDBLOCK 280 case EWOULDBLOCK: 281 # endif 282 # else 283 case EWOULDBLOCK: 284 # endif 285 #endif 286 287 #if defined(ENOTCONN) 288 case ENOTCONN: 289 #endif 290 291 #ifdef EINTR 292 case EINTR: 293 #endif 294 295 #ifdef EAGAIN 296 #if EWOULDBLOCK != EAGAIN 297 case EAGAIN: 298 # endif 299 #endif 300 301 #ifdef EPROTO 302 case EPROTO: 303 #endif 304 305 #ifdef EINPROGRESS 306 case EINPROGRESS: 307 #endif 308 309 #ifdef EALREADY 310 case EALREADY: 311 #endif 312 return(1); 313 /* break; */ 314 default: 315 break; 316 } 317 return(0); 318 } 319 #endif 320