crypto/bio/bss_fd.c

   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
  65 static int fd_write(BIO *h, const char *buf, int num);
  66 static int fd_read(BIO *h, char *buf, int size);
  67 static int fd_puts(BIO *h, const char *str);
  68 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  69 static int fd_new(BIO *h);
  70 static int fd_free(BIO *data);
  71 int BIO_fd_should_retry(int s);
  72
  73 static 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
  86 BIO_METHOD *BIO_s_fd(void)
  87         {
  88         return(&methods_fdp);
  89         }
  90
  91 BIO *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
 100 static 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
 109 static 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
 124 static 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
 142 static 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
 156 static 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
 209 static 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
 218 int 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
 236 int 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         }