release/src/router/openssl/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
  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