crypto/bio/bss_sock.c

   1 /* crypto/bio/bss_sock.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 #ifndef OPENSSL_NO_SOCK
  60
  61 #include <stdio.h>
  62 #include <errno.h>
  63 #define USE_SOCKETS
  64 #include "cryptlib.h"
  65 #include <openssl/bio.h>
  66
  67 static int sock_write(BIO *h, const char *buf, int num);
  68 static int sock_read(BIO *h, char *buf, int size);
  69 static int sock_puts(BIO *h, const char *str);
  70 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  71 static int sock_new(BIO *h);
  72 static int sock_free(BIO *data);
  73 int BIO_sock_should_retry(int s);
  74
  75 static BIO_METHOD methods_sockp=
  76         {
  77         BIO_TYPE_SOCKET,
  78         "socket",
  79         sock_write,
  80         sock_read,
  81         sock_puts,
  82         NULL, /* sock_gets, */
  83         sock_ctrl,
  84         sock_new,
  85         sock_free,
  86         NULL,
  87         };
  88
  89 BIO_METHOD *BIO_s_socket(void)
  90         {
  91         return(&methods_sockp);
  92         }
  93
  94 BIO *BIO_new_socket(int fd, int close_flag)
  95         {
  96         BIO *ret;
  97
  98         ret=BIO_new(BIO_s_socket());
  99         if (ret == NULL) return(NULL);
 100         BIO_set_fd(ret,fd,close_flag);
 101         return(ret);
 102         }
 103
 104 static int sock_new(BIO *bi)
 105         {
 106         bi->init=0;
 107         bi->num=0;
 108         bi->ptr=NULL;
 109         bi->flags=0;
 110         return(1);
 111         }
 112
 113 static int sock_free(BIO *a)
 114         {
 115         if (a == NULL) return(0);
 116         if (a->shutdown)
 117                 {
 118                 if (a->init)
 119                         {
 120                         SHUTDOWN2(a->num);
 121                         }
 122                 a->init=0;
 123                 a->flags=0;
 124                 }
 125         return(1);
 126         }
 127
 128 static int sock_read(BIO *b, char *out, int outl)
 129         {
 130         int ret=0;
 131
 132         if (out != NULL)
 133                 {
 134                 clear_socket_error();
 135                 ret=readsocket(b->num,out,outl);
 136                 BIO_clear_retry_flags(b);
 137                 if (ret <= 0)
 138                         {
 139                         if (BIO_sock_should_retry(ret))
 140                                 BIO_set_retry_read(b);
 141                         }
 142                 }
 143         return(ret);
 144         }
 145
 146 static int sock_write(BIO *b, const char *in, int inl)
 147         {
 148         int ret;
 149
 150         clear_socket_error();
 151         ret=writesocket(b->num,in,inl);
 152         BIO_clear_retry_flags(b);
 153         if (ret <= 0)
 154                 {
 155                 if (BIO_sock_should_retry(ret))
 156                         BIO_set_retry_write(b);
 157                 }
 158         return(ret);
 159         }
 160
 161 static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)
 162         {
 163         long ret=1;
 164         int *ip;
 165
 166         switch (cmd)
 167                 {
 168         case BIO_CTRL_RESET:
 169                 num=0;
 170         case BIO_C_FILE_SEEK:
 171                 ret=0;
 172                 break;
 173         case BIO_C_FILE_TELL:
 174         case BIO_CTRL_INFO:
 175                 ret=0;
 176                 break;
 177         case BIO_C_SET_FD:
 178                 sock_free(b);
 179                 b->num= *((int *)ptr);
 180                 b->shutdown=(int)num;
 181                 b->init=1;
 182                 break;
 183         case BIO_C_GET_FD:
 184                 if (b->init)
 185                         {
 186                         ip=(int *)ptr;
 187                         if (ip != NULL) *ip=b->num;
 188                         ret=b->num;
 189                         }
 190                 else
 191                         ret= -1;
 192                 break;
 193         case BIO_CTRL_GET_CLOSE:
 194                 ret=b->shutdown;
 195                 break;
 196         case BIO_CTRL_SET_CLOSE:
 197                 b->shutdown=(int)num;
 198                 break;
 199         case BIO_CTRL_PENDING:
 200         case BIO_CTRL_WPENDING:
 201                 ret=0;
 202                 break;
 203         case BIO_CTRL_DUP:
 204         case BIO_CTRL_FLUSH:
 205                 ret=1;
 206                 break;
 207         default:
 208                 ret=0;
 209                 break;
 210                 }
 211         return(ret);
 212         }
 213
 214 static int sock_puts(BIO *bp, const char *str)
 215         {
 216         int n,ret;
 217
 218         n=strlen(str);
 219         ret=sock_write(bp,str,n);
 220         return(ret);
 221         }
 222
 223 int BIO_sock_should_retry(int i)
 224         {
 225         int err;
 226
 227         if ((i == 0) || (i == -1))
 228                 {
 229                 err=get_last_socket_error();
 230
 231 #if defined(WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
 232                 if ((i == -1) && (err == 0))
 233                         return(1);
 234 #endif
 235
 236                 return(BIO_sock_non_fatal_error(err));
 237                 }
 238         return(0);
 239         }
 240
 241 int BIO_sock_non_fatal_error(int err)
 242         {
 243         switch (err)
 244                 {
 245 #if defined(WINDOWS)
 246 # if defined(WSAEWOULDBLOCK)
 247         case WSAEWOULDBLOCK:
 248 # endif
 249
 250 # if 0 /* This appears to always be an error */
 251 #  if defined(WSAENOTCONN)
 252         case WSAENOTCONN:
 253 #  endif
 254 # endif
 255 #endif
 256
 257 #ifdef EWOULDBLOCK
 258 # ifdef WSAEWOULDBLOCK
 259 #  if WSAEWOULDBLOCK != EWOULDBLOCK
 260         case EWOULDBLOCK:
 261 #  endif
 262 # else
 263         case EWOULDBLOCK:
 264 # endif
 265 #endif
 266
 267 #if defined(ENOTCONN)
 268         case ENOTCONN:
 269 #endif
 270
 271 #ifdef EINTR
 272         case EINTR:
 273 #endif
 274
 275 #ifdef EAGAIN
 276 #if EWOULDBLOCK != EAGAIN
 277         case EAGAIN:
 278 # endif
 279 #endif
 280
 281 #ifdef EPROTO
 282         case EPROTO:
 283 #endif
 284
 285 #ifdef EINPROGRESS
 286         case EINPROGRESS:
 287 #endif
 288
 289 #ifdef EALREADY
 290         case EALREADY:
 291 #endif
 292                 return(1);
 293                 /* break; */
 294         default:
 295                 break;
 296                 }
 297         return(0);
 298         }
 299 #endif