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 #include <stdio.h>
  60 #include <errno.h>
  61 #define USE_SOCKETS
  62 #include "cryptlib.h"
  63
  64 #ifndef OPENSSL_NO_SOCK
  65
  66 # include <openssl/bio.h>
  67
  68 # ifdef WATT32
  69 #  define sock_write SockWrite  /* Watt-32 uses same names */
  70 #  define sock_read  SockRead
  71 #  define sock_puts  SockPuts
  72 # endif
  73
  74 static int sock_write(BIO *h, const char *buf, int num);
  75 static int sock_read(BIO *h, char *buf, int size);
  76 static int sock_puts(BIO *h, const char *str);
  77 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  78 static int sock_new(BIO *h);
  79 static int sock_free(BIO *data);
  80 int BIO_sock_should_retry(int s);
  81
  82 static BIO_METHOD methods_sockp = {
  83     BIO_TYPE_SOCKET,
  84     "socket",
  85     sock_write,
  86     sock_read,
  87     sock_puts,
  88     NULL,                       /* sock_gets, */
  89     sock_ctrl,
  90     sock_new,
  91     sock_free,
  92     NULL,
  93 };
  94
  95 BIO_METHOD *BIO_s_socket(void)
  96 {
  97     return (&methods_sockp);
  98 }
  99
 100 BIO *BIO_new_socket(int fd, int close_flag)
 101 {
 102     BIO *ret;
 103
 104     ret = BIO_new(BIO_s_socket());
 105     if (ret == NULL)
 106         return (NULL);
 107     BIO_set_fd(ret, fd, close_flag);
 108     return (ret);
 109 }
 110
 111 static int sock_new(BIO *bi)
 112 {
 113     bi->init = 0;
 114     bi->num = 0;
 115     bi->ptr = NULL;
 116     bi->flags = 0;
 117     return (1);
 118 }
 119
 120 static int sock_free(BIO *a)
 121 {
 122     if (a == NULL)
 123         return (0);
 124     if (a->shutdown) {
 125         if (a->init) {
 126             SHUTDOWN2(a->num);
 127         }
 128         a->init = 0;
 129         a->flags = 0;
 130     }
 131     return (1);
 132 }
 133
 134 static int sock_read(BIO *b, char *out, int outl)
 135 {
 136     int ret = 0;
 137
 138     if (out != NULL) {
 139         clear_socket_error();
 140         ret = readsocket(b->num, out, outl);
 141         BIO_clear_retry_flags(b);
 142         if (ret <= 0) {
 143             if (BIO_sock_should_retry(ret))
 144                 BIO_set_retry_read(b);
 145         }
 146     }
 147     return (ret);
 148 }
 149
 150 static int sock_write(BIO *b, const char *in, int inl)
 151 {
 152     int ret;
 153
 154     clear_socket_error();
 155     ret = writesocket(b->num, in, inl);
 156     BIO_clear_retry_flags(b);
 157     if (ret <= 0) {
 158         if (BIO_sock_should_retry(ret))
 159             BIO_set_retry_write(b);
 160     }
 161     return (ret);
 162 }
 163
 164 static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)
 165 {
 166     long ret = 1;
 167     int *ip;
 168
 169     switch (cmd) {
 170     case BIO_C_SET_FD:
 171         sock_free(b);
 172         b->num = *((int *)ptr);
 173         b->shutdown = (int)num;
 174         b->init = 1;
 175         break;
 176     case BIO_C_GET_FD:
 177         if (b->init) {
 178             ip = (int *)ptr;
 179             if (ip != NULL)
 180                 *ip = b->num;
 181             ret = b->num;
 182         } else
 183             ret = -1;
 184         break;
 185     case BIO_CTRL_GET_CLOSE:
 186         ret = b->shutdown;
 187         break;
 188     case BIO_CTRL_SET_CLOSE:
 189         b->shutdown = (int)num;
 190         break;
 191     case BIO_CTRL_DUP:
 192     case BIO_CTRL_FLUSH:
 193         ret = 1;
 194         break;
 195     default:
 196         ret = 0;
 197         break;
 198     }
 199     return (ret);
 200 }
 201
 202 static int sock_puts(BIO *bp, const char *str)
 203 {
 204     int n, ret;
 205
 206     n = strlen(str);
 207     ret = sock_write(bp, str, n);
 208     return (ret);
 209 }
 210
 211 int BIO_sock_should_retry(int i)
 212 {
 213     int err;
 214
 215     if ((i == 0) || (i == -1)) {
 216         err = get_last_socket_error();
 217
 218 # if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps
 219                                        * not? Ben 4/1/99 */
 220         if ((i == -1) && (err == 0))
 221             return (1);
 222 # endif
 223
 224         return (BIO_sock_non_fatal_error(err));
 225     }
 226     return (0);
 227 }
 228
 229 int BIO_sock_non_fatal_error(int err)
 230 {
 231     switch (err) {
 232 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_NETWARE)
 233 #  if defined(WSAEWOULDBLOCK)
 234     case WSAEWOULDBLOCK:
 235 #  endif
 236
 237 #  if 0                         /* This appears to always be an error */
 238 #   if defined(WSAENOTCONN)
 239     case WSAENOTCONN:
 240 #   endif
 241 #  endif
 242 # endif
 243
 244 # ifdef EWOULDBLOCK
 245 #  ifdef WSAEWOULDBLOCK
 246 #   if WSAEWOULDBLOCK != EWOULDBLOCK
 247     case EWOULDBLOCK:
 248 #   endif
 249 #  else
 250     case EWOULDBLOCK:
 251 #  endif
 252 # endif
 253
 254 # if defined(ENOTCONN)
 255     case ENOTCONN:
 256 # endif
 257
 258 # ifdef EINTR
 259     case EINTR:
 260 # endif
 261
 262 # ifdef EAGAIN
 263 #  if EWOULDBLOCK != EAGAIN
 264     case EAGAIN:
 265 #  endif
 266 # endif
 267
 268 # ifdef EPROTO
 269     case EPROTO:
 270 # endif
 271
 272 # ifdef EINPROGRESS
 273     case EINPROGRESS:
 274 # endif
 275
 276 # ifdef EALREADY
 277     case EALREADY:
 278 # endif
 279         return (1);
 280         /* break; */
 281     default:
 282         break;
 283     }
 284     return (0);
 285 }
 286
 287 #endif                          /* #ifndef OPENSSL_NO_SOCK */