src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/ssl/src/crypto/bio/bss_dgram.c - public/gem5-resources - Git at Google

 /* crypto/bio/bio_dgram.c */
 /*
  * DTLS implementation written by Nagendra Modadugu
  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
  */
 /* ====================================================================
  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@OpenSSL.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 #ifndef OPENSSL_NO_DGRAM

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

 #include <openssl/bio.h>

 #define IP_MTU      14 /* linux is lame */

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

 static int dgram_write(BIO *h, const char *buf, int num);
 static int dgram_read(BIO *h, char *buf, int size);
 static int dgram_puts(BIO *h, const char *str);
 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 static int dgram_new(BIO *h);
 static int dgram_free(BIO *data);
 static int dgram_clear(BIO *bio);

 static int BIO_dgram_should_retry(int s);

 static BIO_METHOD methods_dgramp=
 	{
 	BIO_TYPE_DGRAM,
 	"datagram socket",
 	dgram_write,
 	dgram_read,
 	dgram_puts,
 	NULL, /* dgram_gets, */
 	dgram_ctrl,
 	dgram_new,
 	dgram_free,
 	NULL,
 	};

 typedef struct bio_dgram_data_st
 	{
 	struct sockaddr peer;
 	unsigned int connected;
 	unsigned int _errno;
 	unsigned int mtu;
 	} bio_dgram_data;

 BIO_METHOD *BIO_s_datagram(void)
 	{
 	return(&methods_dgramp);
 	}

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

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

 static int dgram_new(BIO *bi)
 	{
 	bio_dgram_data *data = NULL;

 	bi->init=0;
 	bi->num=0;
 	data = OPENSSL_malloc(sizeof(bio_dgram_data));
 	if (data == NULL)
 		return 0;
 	memset(data, 0x00, sizeof(bio_dgram_data));
     bi->ptr = data;

 	bi->flags=0;
 	return(1);
 	}

 static int dgram_free(BIO *a)
 	{
 	bio_dgram_data *data;

 	if (a == NULL) return(0);
 	if ( ! dgram_clear(a))
 		return 0;

 	data = (bio_dgram_data *)a->ptr;
 	if(data != NULL) OPENSSL_free(data);

 	return(1);
 	}

 static int dgram_clear(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 dgram_read(BIO *b, char *out, int outl)
 	{
 	int ret=0;
 	bio_dgram_data *data = (bio_dgram_data *)b->ptr;

 	struct sockaddr peer;
 	int peerlen = sizeof(peer);

 	if (out != NULL)
 		{
 		clear_socket_error();
 		memset(&peer, 0x00, peerlen);
 		/* Last arg in recvfrom is signed on some platforms and
 		 * unsigned on others. It is of type socklen_t on some
 		 * but this is not universal. Cast to (void *) to avoid
 		 * compiler warnings.
 		 */
 		ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);

 		if ( ! data->connected  && ret > 0)
 			BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);

 		BIO_clear_retry_flags(b);
 		if (ret <= 0)
 			{
 			if (BIO_dgram_should_retry(ret))
 				{
 				BIO_set_retry_read(b);
 				data->_errno = get_last_socket_error();
 				}
 			}
 		}
 	return(ret);
 	}

 static int dgram_write(BIO *b, const char *in, int inl)
 	{
 	int ret;
 	bio_dgram_data *data = (bio_dgram_data *)b->ptr;
 	clear_socket_error();

     if ( data->connected )
         ret=writesocket(b->num,in,inl);
     else
 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
         ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
 #else
         ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
 #endif

 	BIO_clear_retry_flags(b);
 	if (ret <= 0)
 		{
 		if (BIO_sock_should_retry(ret))
 			{
 			BIO_set_retry_write(b);
 			data->_errno = get_last_socket_error();

 #if 0 /* higher layers are responsible for querying MTU, if necessary */
 			if ( data->_errno == EMSGSIZE)
 				/* retrieve the new MTU */
 				BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
 #endif
 			}
 		}
 	return(ret);
 	}

 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 	{
 	long ret=1;
 	int *ip;
 	struct sockaddr *to = NULL;
 	bio_dgram_data *data = NULL;
 	long sockopt_val = 0;
 	unsigned int sockopt_len = 0;

 	data = (bio_dgram_data *)b->ptr;

 	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:
 		dgram_clear(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;
 	case BIO_CTRL_DGRAM_CONNECT:
 		to = (struct sockaddr *)ptr;
 #if 0
 		if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
 			{ perror("connect"); ret = 0; }
 		else
 			{
 #endif
 			memcpy(&(data->peer),to, sizeof(struct sockaddr));
 #if 0
 			}
 #endif
 		break;
 		/* (Linux)kernel sets DF bit on outgoing IP packets */
 #ifdef IP_MTU_DISCOVER
 	case BIO_CTRL_DGRAM_MTU_DISCOVER:
 		sockopt_val = IP_PMTUDISC_DO;
 		if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
 			&sockopt_val, sizeof(sockopt_val))) < 0)
 			perror("setsockopt");
 		break;
 #endif
 	case BIO_CTRL_DGRAM_QUERY_MTU:
          sockopt_len = sizeof(sockopt_val);
 		if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
 			&sockopt_len)) < 0 || sockopt_val < 0)
 			{ ret = 0; }
 		else
 			{
 			data->mtu = sockopt_val;
 			ret = data->mtu;
 			}
 		break;
 	case BIO_CTRL_DGRAM_GET_MTU:
 		return data->mtu;
 		break;
 	case BIO_CTRL_DGRAM_SET_MTU:
 		data->mtu = num;
 		ret = num;
 		break;
 	case BIO_CTRL_DGRAM_SET_CONNECTED:
 		to = (struct sockaddr *)ptr;

 		if ( to != NULL)
 			{
 			data->connected = 1;
 			memcpy(&(data->peer),to, sizeof(struct sockaddr));
 			}
 		else
 			{
 			data->connected = 0;
 			memset(&(data->peer), 0x00, sizeof(struct sockaddr));
 			}
 		break;
     case BIO_CTRL_DGRAM_SET_PEER:
         to = (struct sockaddr *) ptr;

         memcpy(&(data->peer), to, sizeof(struct sockaddr));
         break;
 #if defined(SO_RCVTIMEO)
 	case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
 #ifdef OPENSSL_SYS_WINDOWS
 		{
 		struct timeval *tv = (struct timeval *)ptr;
 		int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 		if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 			(void*)&timeout, sizeof(timeout)) < 0)
 			{ perror("setsockopt"); ret = -1; }
 		}
 #else
 		if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
 			sizeof(struct timeval)) < 0)
 			{ perror("setsockopt");	ret = -1; }
 #endif
 		break;
 	case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
 #ifdef OPENSSL_SYS_WINDOWS
 		{
 		int timeout, sz = sizeof(timeout);
 		struct timeval *tv = (struct timeval *)ptr;
 		if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 			(void*)&timeout, &sz) < 0)
 			{ perror("getsockopt"); ret = -1; }
 		else
 			{
 			tv->tv_sec = timeout / 1000;
 			tv->tv_usec = (timeout % 1000) * 1000;
 			ret = sizeof(*tv);
 			}
 		}
 #else
 		if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
 			ptr, (void *)&ret) < 0)
 			{ perror("getsockopt"); ret = -1; }
 #endif
 		break;
 #endif
 #if defined(SO_SNDTIMEO)
 	case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
 #ifdef OPENSSL_SYS_WINDOWS
 		{
 		struct timeval *tv = (struct timeval *)ptr;
 		int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
 		if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 			(void*)&timeout, sizeof(timeout)) < 0)
 			{ perror("setsockopt"); ret = -1; }
 		}
 #else
 		if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
 			sizeof(struct timeval)) < 0)
 			{ perror("setsockopt");	ret = -1; }
 #endif
 		break;
 	case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
 #ifdef OPENSSL_SYS_WINDOWS
 		{
 		int timeout, sz = sizeof(timeout);
 		struct timeval *tv = (struct timeval *)ptr;
 		if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 			(void*)&timeout, &sz) < 0)
 			{ perror("getsockopt"); ret = -1; }
 		else
 			{
 			tv->tv_sec = timeout / 1000;
 			tv->tv_usec = (timeout % 1000) * 1000;
 			ret = sizeof(*tv);
 			}
 		}
 #else
 		if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
 			ptr, (void *)&ret) < 0)
 			{ perror("getsockopt"); ret = -1; }
 #endif
 		break;
 #endif
 	case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
 		/* fall-through */
 	case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
 #ifdef OPENSSL_SYS_WINDOWS
 		if ( data->_errno == WSAETIMEDOUT)
 #else
 		if ( data->_errno == EAGAIN)
 #endif
 			{
 			ret = 1;
 			data->_errno = 0;
 			}
 		else
 			ret = 0;
 		break;
 #ifdef EMSGSIZE
 	case BIO_CTRL_DGRAM_MTU_EXCEEDED:
 		if ( data->_errno == EMSGSIZE)
 			{
 			ret = 1;
 			data->_errno = 0;
 			}
 		else
 			ret = 0;
 		break;
 #endif
 	default:
 		ret=0;
 		break;
 		}
 	return(ret);
 	}

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

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

 static int BIO_dgram_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_dgram_non_fatal_error(err));
 		}
 	return(0);
 	}

 int BIO_dgram_non_fatal_error(int err)
 	{
 	switch (err)
 		{
 #if defined(OPENSSL_SYS_WINDOWS)
 # 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

 /* DF bit set, and packet larger than MTU */
 #ifdef EMSGSIZE
 	case EMSGSIZE:
 #endif

 		return(1);
 		/* break; */
 	default:
 		break;
 		}
 	return(0);
 	}
 #endif
	/* crypto/bio/bio_dgram.c */
	/*
	* DTLS implementation written by Nagendra Modadugu
	* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
	*/
	/* ====================================================================
	* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@OpenSSL.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	#ifndef OPENSSL_NO_DGRAM

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

	#include <openssl/bio.h>

	#define IP_MTU 14 /* linux is lame */

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

	static int dgram_write(BIO h, const char buf, int num);
	static int dgram_read(BIO h, char buf, int size);
	static int dgram_puts(BIO h, const char str);
	static long dgram_ctrl(BIO h, int cmd, long arg1, void arg2);
	static int dgram_new(BIO *h);
	static int dgram_free(BIO *data);
	static int dgram_clear(BIO *bio);

	static int BIO_dgram_should_retry(int s);

	static BIO_METHOD methods_dgramp=
	{
	BIO_TYPE_DGRAM,
	"datagram socket",
	dgram_write,
	dgram_read,
	dgram_puts,
	NULL, /* dgram_gets, */
	dgram_ctrl,
	dgram_new,
	dgram_free,
	NULL,
	};

	typedef struct bio_dgram_data_st
	{
	struct sockaddr peer;
	unsigned int connected;
	unsigned int _errno;
	unsigned int mtu;
	} bio_dgram_data;

	BIO_METHOD *BIO_s_datagram(void)
	{
	return(&methods_dgramp);
	}

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

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

	static int dgram_new(BIO *bi)
	{
	bio_dgram_data *data = NULL;

	bi->init=0;
	bi->num=0;
	data = OPENSSL_malloc(sizeof(bio_dgram_data));
	if (data == NULL)
	return 0;
	memset(data, 0x00, sizeof(bio_dgram_data));
	bi->ptr = data;

	bi->flags=0;
	return(1);
	}

	static int dgram_free(BIO *a)
	{
	bio_dgram_data *data;

	if (a == NULL) return(0);
	if ( ! dgram_clear(a))
	return 0;

	data = (bio_dgram_data *)a->ptr;
	if(data != NULL) OPENSSL_free(data);

	return(1);
	}

	static int dgram_clear(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 dgram_read(BIO b, char out, int outl)
	{
	int ret=0;
	bio_dgram_data data = (bio_dgram_data )b->ptr;

	struct sockaddr peer;
	int peerlen = sizeof(peer);

	if (out != NULL)
	{
	clear_socket_error();
	memset(&peer, 0x00, peerlen);
	/* Last arg in recvfrom is signed on some platforms and
	* unsigned on others. It is of type socklen_t on some
	* but this is not universal. Cast to (void *) to avoid
	* compiler warnings.
	*/
	ret=recvfrom(b->num,out,outl,0,&peer,(void *)&peerlen);

	if ( ! data->connected && ret > 0)
	BIO_ctrl(b, BIO_CTRL_DGRAM_CONNECT, 0, &peer);

	BIO_clear_retry_flags(b);
	if (ret <= 0)
	{
	if (BIO_dgram_should_retry(ret))
	{
	BIO_set_retry_read(b);
	data->_errno = get_last_socket_error();
	}
	}
	}
	return(ret);
	}

	static int dgram_write(BIO b, const char in, int inl)
	{
	int ret;
	bio_dgram_data data = (bio_dgram_data )b->ptr;
	clear_socket_error();

	if ( data->connected )
	ret=writesocket(b->num,in,inl);
	else
	#if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK)
	ret=sendto(b->num, (char *)in, inl, 0, &data->peer, sizeof(data->peer));
	#else
	ret=sendto(b->num, in, inl, 0, &data->peer, sizeof(data->peer));
	#endif

	BIO_clear_retry_flags(b);
	if (ret <= 0)
	{
	if (BIO_sock_should_retry(ret))
	{
	BIO_set_retry_write(b);
	data->_errno = get_last_socket_error();

	#if 0 /* higher layers are responsible for querying MTU, if necessary */
	if ( data->_errno == EMSGSIZE)
	/* retrieve the new MTU */
	BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
	#endif
	}
	}
	return(ret);
	}

	static long dgram_ctrl(BIO b, int cmd, long num, void ptr)
	{
	long ret=1;
	int *ip;
	struct sockaddr *to = NULL;
	bio_dgram_data *data = NULL;
	long sockopt_val = 0;
	unsigned int sockopt_len = 0;

	data = (bio_dgram_data *)b->ptr;

	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:
	dgram_clear(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;
	case BIO_CTRL_DGRAM_CONNECT:
	to = (struct sockaddr *)ptr;
	#if 0
	if (connect(b->num, to, sizeof(struct sockaddr)) < 0)
	{ perror("connect"); ret = 0; }
	else
	{
	#endif
	memcpy(&(data->peer),to, sizeof(struct sockaddr));
	#if 0
	}
	#endif
	break;
	/* (Linux)kernel sets DF bit on outgoing IP packets */
	#ifdef IP_MTU_DISCOVER
	case BIO_CTRL_DGRAM_MTU_DISCOVER:
	sockopt_val = IP_PMTUDISC_DO;
	if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
	&sockopt_val, sizeof(sockopt_val))) < 0)
	perror("setsockopt");
	break;
	#endif
	case BIO_CTRL_DGRAM_QUERY_MTU:
	sockopt_len = sizeof(sockopt_val);
	if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val,
	&sockopt_len)) < 0 \|\| sockopt_val < 0)
	{ ret = 0; }
	else
	{
	data->mtu = sockopt_val;
	ret = data->mtu;
	}
	break;
	case BIO_CTRL_DGRAM_GET_MTU:
	return data->mtu;
	break;
	case BIO_CTRL_DGRAM_SET_MTU:
	data->mtu = num;
	ret = num;
	break;
	case BIO_CTRL_DGRAM_SET_CONNECTED:
	to = (struct sockaddr *)ptr;

	if ( to != NULL)
	{
	data->connected = 1;
	memcpy(&(data->peer),to, sizeof(struct sockaddr));
	}
	else
	{
	data->connected = 0;
	memset(&(data->peer), 0x00, sizeof(struct sockaddr));
	}
	break;
	case BIO_CTRL_DGRAM_SET_PEER:
	to = (struct sockaddr *) ptr;

	memcpy(&(data->peer), to, sizeof(struct sockaddr));
	break;
	#if defined(SO_RCVTIMEO)
	case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT:
	#ifdef OPENSSL_SYS_WINDOWS
	{
	struct timeval tv = (struct timeval )ptr;
	int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
	if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
	(void*)&timeout, sizeof(timeout)) < 0)
	{ perror("setsockopt"); ret = -1; }
	}
	#else
	if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr,
	sizeof(struct timeval)) < 0)
	{ perror("setsockopt"); ret = -1; }
	#endif
	break;
	case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
	#ifdef OPENSSL_SYS_WINDOWS
	{
	int timeout, sz = sizeof(timeout);
	struct timeval tv = (struct timeval )ptr;
	if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
	(void*)&timeout, &sz) < 0)
	{ perror("getsockopt"); ret = -1; }
	else
	{
	tv->tv_sec = timeout / 1000;
	tv->tv_usec = (timeout % 1000) * 1000;
	ret = sizeof(*tv);
	}
	}
	#else
	if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
	ptr, (void *)&ret) < 0)
	{ perror("getsockopt"); ret = -1; }
	#endif
	break;
	#endif
	#if defined(SO_SNDTIMEO)
	case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT:
	#ifdef OPENSSL_SYS_WINDOWS
	{
	struct timeval tv = (struct timeval )ptr;
	int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000;
	if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
	(void*)&timeout, sizeof(timeout)) < 0)
	{ perror("setsockopt"); ret = -1; }
	}
	#else
	if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr,
	sizeof(struct timeval)) < 0)
	{ perror("setsockopt"); ret = -1; }
	#endif
	break;
	case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
	#ifdef OPENSSL_SYS_WINDOWS
	{
	int timeout, sz = sizeof(timeout);
	struct timeval tv = (struct timeval )ptr;
	if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
	(void*)&timeout, &sz) < 0)
	{ perror("getsockopt"); ret = -1; }
	else
	{
	tv->tv_sec = timeout / 1000;
	tv->tv_usec = (timeout % 1000) * 1000;
	ret = sizeof(*tv);
	}
	}
	#else
	if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
	ptr, (void *)&ret) < 0)
	{ perror("getsockopt"); ret = -1; }
	#endif
	break;
	#endif
	case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
	/* fall-through */
	case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP:
	#ifdef OPENSSL_SYS_WINDOWS
	if ( data->_errno == WSAETIMEDOUT)
	#else
	if ( data->_errno == EAGAIN)
	#endif
	{
	ret = 1;
	data->_errno = 0;
	}
	else
	ret = 0;
	break;
	#ifdef EMSGSIZE
	case BIO_CTRL_DGRAM_MTU_EXCEEDED:
	if ( data->_errno == EMSGSIZE)
	{
	ret = 1;
	data->_errno = 0;
	}
	else
	ret = 0;
	break;
	#endif
	default:
	ret=0;
	break;
	}
	return(ret);
	}

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

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

	static int BIO_dgram_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_dgram_non_fatal_error(err));
	}
	return(0);
	}

	int BIO_dgram_non_fatal_error(int err)
	{
	switch (err)
	{
	#if defined(OPENSSL_SYS_WINDOWS)
	# 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

	/* DF bit set, and packet larger than MTU */
	#ifdef EMSGSIZE
	case EMSGSIZE:
	#endif

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