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bss_sock.c

/* crypto/bio/bss_sock.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>

#ifdef WATT32
#define sock_write SockWrite  /* Watt-32 uses same names */
#define sock_read  SockRead
#define sock_puts  SockPuts
#endif

static int sock_write(BIO *h, const char *buf, int num);
static int sock_read(BIO *h, char *buf, int size);
static int sock_puts(BIO *h, const char *str);
static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int sock_new(BIO *h);
static int sock_free(BIO *data);
int BIO_sock_should_retry(int s);

static BIO_METHOD methods_sockp=
      {
      BIO_TYPE_SOCKET,
      "socket",
      sock_write,
      sock_read,
      sock_puts,
      NULL, /* sock_gets, */
      sock_ctrl,
      sock_new,
      sock_free,
      NULL,
      };

BIO_METHOD *BIO_s_socket(void)
      {
      return(&methods_sockp);
      }

BIO *BIO_new_socket(int fd, int close_flag)
      {
      BIO *ret;

      ret=BIO_new(BIO_s_socket());
      if (ret == NULL) return(NULL);
      BIO_set_fd(ret,fd,close_flag);
      return(ret);
      }

static int sock_new(BIO *bi)
      {
      bi->init=0;
      bi->num=0;
      bi->ptr=NULL;
      bi->flags=0;
      return(1);
      }

static int sock_free(BIO *a)
      {
      if (a == NULL) return(0);
      if (a->shutdown)
            {
            if (a->init)
                  {
                  SHUTDOWN2(a->num);
                  }
            a->init=0;
            a->flags=0;
            }
      return(1);
      }
      
static int sock_read(BIO *b, char *out, int outl)
      {
      int ret=0;

      if (out != NULL)
            {
            clear_socket_error();
            ret=readsocket(b->num,out,outl);
            BIO_clear_retry_flags(b);
            if (ret <= 0)
                  {
                  if (BIO_sock_should_retry(ret))
                        BIO_set_retry_read(b);
                  }
            }
      return(ret);
      }

static int sock_write(BIO *b, const char *in, int inl)
      {
      int ret;
      
      clear_socket_error();
      ret=writesocket(b->num,in,inl);
      BIO_clear_retry_flags(b);
      if (ret <= 0)
            {
            if (BIO_sock_should_retry(ret))
                  BIO_set_retry_write(b);
            }
      return(ret);
      }

static long sock_ctrl(BIO *b, int cmd, long num, void *ptr)
      {
      long ret=1;
      int *ip;

      switch (cmd)
            {
      case BIO_CTRL_RESET:
            num=0;
      case BIO_C_FILE_SEEK:
            ret=0;
            break;
      case BIO_C_FILE_TELL:
      case BIO_CTRL_INFO:
            ret=0;
            break;
      case BIO_C_SET_FD:
            sock_free(b);
            b->num= *((int *)ptr);
            b->shutdown=(int)num;
            b->init=1;
            break;
      case BIO_C_GET_FD:
            if (b->init)
                  {
                  ip=(int *)ptr;
                  if (ip != NULL) *ip=b->num;
                  ret=b->num;
                  }
            else
                  ret= -1;
            break;
      case BIO_CTRL_GET_CLOSE:
            ret=b->shutdown;
            break;
      case BIO_CTRL_SET_CLOSE:
            b->shutdown=(int)num;
            break;
      case BIO_CTRL_PENDING:
      case BIO_CTRL_WPENDING:
            ret=0;
            break;
      case BIO_CTRL_DUP:
      case BIO_CTRL_FLUSH:
            ret=1;
            break;
      default:
            ret=0;
            break;
            }
      return(ret);
      }

static int sock_puts(BIO *bp, const char *str)
      {
      int n,ret;

      n=strlen(str);
      ret=sock_write(bp,str,n);
      return(ret);
      }

int BIO_sock_should_retry(int i)
      {
      int err;

      if ((i == 0) || (i == -1))
            {
            err=get_last_socket_error();

#if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
            if ((i == -1) && (err == 0))
                  return(1);
#endif

            return(BIO_sock_non_fatal_error(err));
            }
      return(0);
      }

int BIO_sock_non_fatal_error(int err)
      {
      switch (err)
            {
#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_NETWARE)
# if defined(WSAEWOULDBLOCK)
      case WSAEWOULDBLOCK:
# endif

# if 0 /* This appears to always be an error */
#  if defined(WSAENOTCONN)
      case WSAENOTCONN:
#  endif
# endif
#endif

#ifdef EWOULDBLOCK
# ifdef WSAEWOULDBLOCK
#  if WSAEWOULDBLOCK != EWOULDBLOCK
      case EWOULDBLOCK:
#  endif
# else
      case EWOULDBLOCK:
# endif
#endif

#if defined(ENOTCONN)
      case ENOTCONN:
#endif

#ifdef EINTR
      case EINTR:
#endif

#ifdef EAGAIN
# if EWOULDBLOCK != EAGAIN
      case EAGAIN:
# endif
#endif

#ifdef EPROTO
      case EPROTO:
#endif

#ifdef EINPROGRESS
      case EINPROGRESS:
#endif

#ifdef EALREADY
      case EALREADY:
#endif
            return(1);
            /* break; */
      default:
            break;
            }
      return(0);
      }

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