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 * Dummy placeholder for BIO_s_fd... 67 */ 68BIO *BIO_new_fd(int fd, int close_flag) 69{ 70 return NULL; 71} 72 73int BIO_fd_non_fatal_error(int err) 74{ 75 return 0; 76} 77 78int BIO_fd_should_retry(int i) 79{ 80 return 0; 81} 82 83BIO_METHOD *BIO_s_fd(void) 84{ 85 return NULL; 86} 87#else 88/* 89 * As for unconditional usage of "UPLINK" interface in this module. 90 * Trouble is that unlike Unix file descriptors [which are indexes 91 * in kernel-side per-process table], corresponding descriptors on 92 * platforms which require "UPLINK" interface seem to be indexes 93 * in a user-land, non-global table. Well, in fact they are indexes 94 * in stdio _iob[], and recall that _iob[] was the very reason why 95 * "UPLINK" interface was introduced in first place. But one way on 96 * another. Neither libcrypto or libssl use this BIO meaning that 97 * file descriptors can only be provided by application. Therefore 98 * "UPLINK" calls are due... 99 */ 100# include "bio_lcl.h" 101 102static int fd_write(BIO *h, const char *buf, int num); 103static int fd_read(BIO *h, char *buf, int size); 104static int fd_puts(BIO *h, const char *str); 105static int fd_gets(BIO *h, char *buf, int size); 106static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 107static int fd_new(BIO *h); 108static int fd_free(BIO *data); 109int BIO_fd_should_retry(int s); 110 111static BIO_METHOD methods_fdp = { 112 BIO_TYPE_FD, "file descriptor", 113 fd_write, 114 fd_read, 115 fd_puts, 116 fd_gets, 117 fd_ctrl, 118 fd_new, 119 fd_free, 120 NULL, 121}; 122 123BIO_METHOD *BIO_s_fd(void) 124{ 125 return (&methods_fdp); 126} 127 128BIO *BIO_new_fd(int fd, int close_flag) 129{ 130 BIO *ret; 131 ret = BIO_new(BIO_s_fd()); 132 if (ret == NULL) 133 return (NULL); 134 BIO_set_fd(ret, fd, close_flag); 135 return (ret); 136} 137 138static int fd_new(BIO *bi) 139{ 140 bi->init = 0; 141 bi->num = -1; 142 bi->ptr = NULL; 143 bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */ 144 return (1); 145} 146 147static int fd_free(BIO *a) 148{ 149 if (a == NULL) 150 return (0); 151 if (a->shutdown) { 152 if (a->init) { 153 UP_close(a->num); 154 } 155 a->init = 0; 156 a->flags = BIO_FLAGS_UPLINK; 157 } 158 return (1); 159} 160 161static int fd_read(BIO *b, char *out, int outl) 162{ 163 int ret = 0; 164 165 if (out != NULL) { 166 clear_sys_error(); 167 ret = UP_read(b->num, out, outl); 168 BIO_clear_retry_flags(b); 169 if (ret <= 0) { 170 if (BIO_fd_should_retry(ret)) 171 BIO_set_retry_read(b); 172 } 173 } 174 return (ret); 175} 176 177static int fd_write(BIO *b, const char *in, int inl) 178{ 179 int ret; 180 clear_sys_error(); 181 ret = UP_write(b->num, in, inl); 182 BIO_clear_retry_flags(b); 183 if (ret <= 0) { 184 if (BIO_fd_should_retry(ret)) 185 BIO_set_retry_write(b); 186 } 187 return (ret); 188} 189 190static long fd_ctrl(BIO *b, int cmd, long num, void *ptr) 191{ 192 long ret = 1; 193 int *ip; 194 195 switch (cmd) { 196 case BIO_CTRL_RESET: 197 num = 0; 198 case BIO_C_FILE_SEEK: 199 ret = (long)UP_lseek(b->num, num, 0); 200 break; 201 case BIO_C_FILE_TELL: 202 case BIO_CTRL_INFO: 203 ret = (long)UP_lseek(b->num, 0, 1); 204 break; 205 case BIO_C_SET_FD: 206 fd_free(b); 207 b->num = *((int *)ptr); 208 b->shutdown = (int)num; 209 b->init = 1; 210 break; 211 case BIO_C_GET_FD: 212 if (b->init) { 213 ip = (int *)ptr; 214 if (ip != NULL) 215 *ip = b->num; 216 ret = b->num; 217 } else 218 ret = -1; 219 break; 220 case BIO_CTRL_GET_CLOSE: 221 ret = b->shutdown; 222 break; 223 case BIO_CTRL_SET_CLOSE: 224 b->shutdown = (int)num; 225 break; 226 case BIO_CTRL_PENDING: 227 case BIO_CTRL_WPENDING: 228 ret = 0; 229 break; 230 case BIO_CTRL_DUP: 231 case BIO_CTRL_FLUSH: 232 ret = 1; 233 break; 234 default: 235 ret = 0; 236 break; 237 } 238 return (ret); 239} 240 241static int fd_puts(BIO *bp, const char *str) 242{ 243 int n, ret; 244 245 n = strlen(str); 246 ret = fd_write(bp, str, n); 247 return (ret); 248} 249 250static int fd_gets(BIO *bp, char *buf, int size) 251{ 252 int ret = 0; 253 char *ptr = buf; 254 char *end = buf + size - 1; 255 256 while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n')) 257 ptr++; 258 259 ptr[0] = '\0'; 260 261 if (buf[0] != '\0') 262 ret = strlen(buf); 263 return (ret); 264} 265 266int BIO_fd_should_retry(int i) 267{ 268 int err; 269 270 if ((i == 0) || (i == -1)) { 271 err = get_last_sys_error(); 272 273# if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps 274 * not? Ben 4/1/99 */ 275 if ((i == -1) && (err == 0)) 276 return (1); 277# endif 278 279 return (BIO_fd_non_fatal_error(err)); 280 } 281 return (0); 282} 283 284int BIO_fd_non_fatal_error(int err) 285{ 286 switch (err) { 287 288# ifdef EWOULDBLOCK 289# ifdef WSAEWOULDBLOCK 290# if WSAEWOULDBLOCK != EWOULDBLOCK 291 case EWOULDBLOCK: 292# endif 293# else 294 case EWOULDBLOCK: 295# endif 296# endif 297 298# if defined(ENOTCONN) 299 case ENOTCONN: 300# endif 301 302# ifdef EINTR 303 case EINTR: 304# endif 305 306# ifdef EAGAIN 307# if EWOULDBLOCK != EAGAIN 308 case EAGAIN: 309# endif 310# endif 311 312# ifdef EPROTO 313 case EPROTO: 314# endif 315 316# ifdef EINPROGRESS 317 case EINPROGRESS: 318# endif 319 320# ifdef EALREADY 321 case EALREADY: 322# endif 323 return (1); 324 /* break; */ 325 default: 326 break; 327 } 328 return (0); 329} 330#endif 331