text: /* crypto/bio/b_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 <stdlib.h>
  #include <errno.h>
  #define USE_SOCKETS
  #include "cryptlib.h"
  #include <openssl/bio.h>
  #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
  #include "netdb.h"
  #endif
  
  #ifndef OPENSSL_NO_SOCK
  
  #ifdef OPENSSL_SYS_WIN16
  #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  #else
  #define SOCKET_PROTOCOL IPPROTO_TCP
  #endif
  
  #ifdef SO_MAXCONN
  #define MAX_LISTEN  SO_MAXCONN
  #elif defined(SOMAXCONN)
  #define MAX_LISTEN  SOMAXCONN
  #else
  #define MAX_LISTEN  32
  #endif
  
  #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  static int wsa_init_done=0;
  #endif
  
  #if 0
  static unsigned long BIO_ghbn_hits=0L;
  static unsigned long BIO_ghbn_miss=0L;
  
  #define GHBN_NUM	4
  static struct ghbn_cache_st
  	{
  	char name[129];
  	struct hostent *ent;
  	unsigned long order;
  	} ghbn_cache[GHBN_NUM];
  #endif
  
  static int get_ip(const char *str,unsigned char *ip);
  #if 0
  static void ghbn_free(struct hostent *a);
  static struct hostent *ghbn_dup(struct hostent *a);
  #endif
  int BIO_get_host_ip(const char *str, unsigned char *ip)
  	{
  	int i;
  	int err = 1;
  	int locked = 0;
  	struct hostent *he;
  
  	i=get_ip(str,ip);
  	if (i < 0)
  		{
  		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_INVALID_IP_ADDRESS);
  		goto err;
  		}
  
  	/* At this point, we have something that is most probably correct
  	   in some way, so let's init the socket. */
  	if (BIO_sock_init() != 1)
  		return 0; /* don't generate another error code here */
  
  	/* If the string actually contained an IP address, we need not do
  	   anything more */
  	if (i > 0) return(1);
  
  	/* do a gethostbyname */
  	CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
  	locked = 1;
  	he=BIO_gethostbyname(str);
  	if (he == NULL)
  		{
  		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_BAD_HOSTNAME_LOOKUP);
  		goto err;
  		}
  
  	/* cast to short because of win16 winsock definition */
  	if ((short)he->h_addrtype != AF_INET)
  		{
  		BIOerr(BIO_F_BIO_GET_HOST_IP,BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
  		goto err;
  		}
  	for (i=0; i<4; i++)
  		ip[i]=he->h_addr_list[0][i];
  	err = 0;
  
   err:
  	if (locked)
  		CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
  	if (err)
  		{
  		ERR_add_error_data(2,"host=",str);
  		return 0;
  		}
  	else
  		return 1;
  	}
  
  int BIO_get_port(const char *str, unsigned short *port_ptr)
  	{
  	int i;
  	struct servent *s;
  
  	if (str == NULL)
  		{
  		BIOerr(BIO_F_BIO_GET_PORT,BIO_R_NO_PORT_DEFINED);
  		return(0);
  		}
  	i=atoi(str);
  	if (i != 0)
  		*port_ptr=(unsigned short)i;
  	else
  		{
  		CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
  		/* Note: under VMS with SOCKETSHR, it seems like the first
  		 * parameter is 'char *', instead of 'const char *'
  		 */
   		s=getservbyname(
  #ifndef CONST_STRICT
  		    (char *)
  #endif
  		    str,"tcp");
  		if(s != NULL)
  			*port_ptr=ntohs((unsigned short)s->s_port);
  		CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
  		if(s == NULL)
  			{
  			if (strcmp(str,"http") == 0)
  				*port_ptr=80;
  			else if (strcmp(str,"telnet") == 0)
  				*port_ptr=23;
  			else if (strcmp(str,"socks") == 0)
  				*port_ptr=1080;
  			else if (strcmp(str,"https") == 0)
  				*port_ptr=443;
  			else if (strcmp(str,"ssl") == 0)
  				*port_ptr=443;
  			else if (strcmp(str,"ftp") == 0)
  				*port_ptr=21;
  			else if (strcmp(str,"gopher") == 0)
  				*port_ptr=70;
  #if 0
  			else if (strcmp(str,"wais") == 0)
  				*port_ptr=21;
  #endif
  			else
  				{
  				SYSerr(SYS_F_GETSERVBYNAME,get_last_socket_error());
  				ERR_add_error_data(3,"service='",str,"'");
  				return(0);
  				}
  			}
  		}
  	return(1);
  	}
  
  int BIO_sock_error(int sock)
  	{
  	int j,i;
  	int size;
  		 
  	size=sizeof(int);
  	/* Note: under Windows the third parameter is of type (char *)
  	 * whereas under other systems it is (void *) if you don't have
  	 * a cast it will choke the compiler: if you do have a cast then
  	 * you can either go for (char *) or (void *).
  	 */
  	i=getsockopt(sock,SOL_SOCKET,SO_ERROR,(void *)&j,(void *)&size);
  	if (i < 0)
  		return(1);
  	else
  		return(j);
  	}
  
  #if 0
  long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
  	{
  	int i;
  	char **p;
  
  	switch (cmd)
  		{
  	case BIO_GHBN_CTRL_HITS:
  		return(BIO_ghbn_hits);
  		/* break; */
  	case BIO_GHBN_CTRL_MISSES:
  		return(BIO_ghbn_miss);
  		/* break; */
  	case BIO_GHBN_CTRL_CACHE_SIZE:
  		return(GHBN_NUM);
  		/* break; */
  	case BIO_GHBN_CTRL_GET_ENTRY:
  		if ((iarg >= 0) && (iarg <GHBN_NUM) &&
  			(ghbn_cache[iarg].order > 0))
  			{
  			p=(char **)parg;
  			if (p == NULL) return(0);
  			*p=ghbn_cache[iarg].name;
  			ghbn_cache[iarg].name[128]='\0';
  			return(1);
  			}
  		return(0);
  		/* break; */
  	case BIO_GHBN_CTRL_FLUSH:
  		for (i=0; i<GHBN_NUM; i++)
  			ghbn_cache[i].order=0;
  		break;
  	default:
  		return(0);
  		}
  	return(1);
  	}
  #endif
  
  #if 0
  static struct hostent *ghbn_dup(struct hostent *a)
  	{
  	struct hostent *ret;
  	int i,j;
  
  	MemCheck_off();
  	ret=(struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
  	if (ret == NULL) return(NULL);
  	memset(ret,0,sizeof(struct hostent));
  
  	for (i=0; a->h_aliases[i] != NULL; i++)
  		;
  	i++;
  	ret->h_aliases = (char **)OPENSSL_malloc(i*sizeof(char *));
  	if (ret->h_aliases == NULL)
  		goto err;
  	memset(ret->h_aliases, 0, i*sizeof(char *));
  
  	for (i=0; a->h_addr_list[i] != NULL; i++)
  		;
  	i++;
  	ret->h_addr_list=(char **)OPENSSL_malloc(i*sizeof(char *));
  	if (ret->h_addr_list == NULL)
  		goto err;
  	memset(ret->h_addr_list, 0, i*sizeof(char *));
  
  	j=strlen(a->h_name)+1;
  	if ((ret->h_name=OPENSSL_malloc(j)) == NULL) goto err;
  	memcpy((char *)ret->h_name,a->h_name,j);
  	for (i=0; a->h_aliases[i] != NULL; i++)
  		{
  		j=strlen(a->h_aliases[i])+1;
  		if ((ret->h_aliases[i]=OPENSSL_malloc(j)) == NULL) goto err;
  		memcpy(ret->h_aliases[i],a->h_aliases[i],j);
  		}
  	ret->h_length=a->h_length;
  	ret->h_addrtype=a->h_addrtype;
  	for (i=0; a->h_addr_list[i] != NULL; i++)
  		{
  		if ((ret->h_addr_list[i]=OPENSSL_malloc(a->h_length)) == NULL)
  			goto err;
  		memcpy(ret->h_addr_list[i],a->h_addr_list[i],a->h_length);
  		}
  	if (0)
  		{
  err:	
  		if (ret != NULL)
  			ghbn_free(ret);
  		ret=NULL;
  		}
  	MemCheck_on();
  	return(ret);
  	}
  
  static void ghbn_free(struct hostent *a)
  	{
  	int i;
  
  	if(a == NULL)
  	    return;
  
  	if (a->h_aliases != NULL)
  		{
  		for (i=0; a->h_aliases[i] != NULL; i++)
  			OPENSSL_free(a->h_aliases[i]);
  		OPENSSL_free(a->h_aliases);
  		}
  	if (a->h_addr_list != NULL)
  		{
  		for (i=0; a->h_addr_list[i] != NULL; i++)
  			OPENSSL_free(a->h_addr_list[i]);
  		OPENSSL_free(a->h_addr_list);
  		}
  	if (a->h_name != NULL) OPENSSL_free(a->h_name);
  	OPENSSL_free(a);
  	}
  
  #endif
  
  struct hostent *BIO_gethostbyname(const char *name)
  	{
  #if 1
  	/* Caching gethostbyname() results forever is wrong,
  	 * so we have to let the true gethostbyname() worry about this */
  	return gethostbyname(name);
  #else
  	struct hostent *ret;
  	int i,lowi=0,j;
  	unsigned long low= (unsigned long)-1;
  
  
  #  if 0
  	/* It doesn't make sense to use locking here: The function interface
  	 * is not thread-safe, because threads can never be sure when
  	 * some other thread destroys the data they were given a pointer to.
  	 */
  	CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
  #  endif
  	j=strlen(name);
  	if (j < 128)
  		{
  		for (i=0; i<GHBN_NUM; i++)
  			{
  			if (low > ghbn_cache[i].order)
  				{
  				low=ghbn_cache[i].order;
  				lowi=i;
  				}
  			if (ghbn_cache[i].order > 0)
  				{
  				if (strncmp(name,ghbn_cache[i].name,128) == 0)
  					break;
  				}
  			}
  		}
  	else
  		i=GHBN_NUM;
  
  	if (i == GHBN_NUM) /* no hit*/
  		{
  		BIO_ghbn_miss++;
  		/* Note: under VMS with SOCKETSHR, it seems like the first
  		 * parameter is 'char *', instead of 'const char *'
  		 */
  		ret=gethostbyname(
  #  ifndef CONST_STRICT
  		    (char *)
  #  endif
  		    name);
  
  		if (ret == NULL)
  			goto end;
  		if (j > 128) /* too big to cache */
  			{
  #  if 0
  			/* If we were trying to make this function thread-safe (which
  			 * is bound to fail), we'd have to give up in this case
  			 * (or allocate more memory). */
  			ret = NULL;
  #  endif
  			goto end;
  			}
  
  		/* else add to cache */
  		if (ghbn_cache[lowi].ent != NULL)
  			ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
  		ghbn_cache[lowi].name[0] = '\0';
  
  		if((ret=ghbn_cache[lowi].ent=ghbn_dup(ret)) == NULL)
  			{
  			BIOerr(BIO_F_BIO_GETHOSTBYNAME,ERR_R_MALLOC_FAILURE);
  			goto end;
  			}
  		strncpy(ghbn_cache[lowi].name,name,128);
  		ghbn_cache[lowi].order=BIO_ghbn_miss+BIO_ghbn_hits;
  		}
  	else
  		{
  		BIO_ghbn_hits++;
  		ret= ghbn_cache[i].ent;
  		ghbn_cache[i].order=BIO_ghbn_miss+BIO_ghbn_hits;
  		}
  end:
  #  if 0
  	CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
  #  endif
  	return(ret);
  #endif
  	}
  
  
  int BIO_sock_init(void)
  	{
  #ifdef OPENSSL_SYS_WINDOWS
  	static struct WSAData wsa_state;
  
  	if (!wsa_init_done)
  		{
  		int err;
  	  
  		wsa_init_done=1;
  		memset(&wsa_state,0,sizeof(wsa_state));
  		if (WSAStartup(0x0101,&wsa_state)!=0)
  			{
  			err=WSAGetLastError();
  			SYSerr(SYS_F_WSASTARTUP,err);
  			BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
  			return(-1);
  			}
  		}
  #endif /* OPENSSL_SYS_WINDOWS */
  #ifdef WATT32
  	extern int _watt_do_exit;
  	_watt_do_exit = 0;    /* don't make sock_init() call exit() */
  	if (sock_init())
  		return (-1);
  #endif
  
  #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
      WORD wVerReq;
      WSADATA wsaData;
      int err;
  
      if (!wsa_init_done)
      {
          wsa_init_done=1;
          wVerReq = MAKEWORD( 2, 0 );
          err = WSAStartup(wVerReq,&wsaData);
          if (err != 0)
          {
              SYSerr(SYS_F_WSASTARTUP,err);
              BIOerr(BIO_F_BIO_SOCK_INIT,BIO_R_WSASTARTUP);
              return(-1);
  			}
  		}
  #endif
  
  	return(1);
  	}
  
  void BIO_sock_cleanup(void)
  	{
  #ifdef OPENSSL_SYS_WINDOWS
  	if (wsa_init_done)
  		{
  		wsa_init_done=0;
  #ifndef OPENSSL_SYS_WINCE
  		WSACancelBlockingCall();	/* Winsock 1.1 specific */
  #endif
  		WSACleanup();
  		}
  #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
     if (wsa_init_done)
          {
          wsa_init_done=0;
          WSACleanup();
  		}
  #endif
  	}
  
  #if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000
  
  int BIO_socket_ioctl(int fd, long type, void *arg)
  	{
  	int i;
  
  #ifdef __DJGPP__
  	i=ioctlsocket(fd,type,(char *)arg);
  #else
  	i=ioctlsocket(fd,type,arg);
  #endif /* __DJGPP__ */
  	if (i < 0)
  		SYSerr(SYS_F_IOCTLSOCKET,get_last_socket_error());
  	return(i);
  	}
  #endif /* __VMS_VER */
  
  /* The reason I have implemented this instead of using sscanf is because
   * Visual C 1.52c gives an unresolved external when linking a DLL :-( */
  static int get_ip(const char *str, unsigned char ip[4])
  	{
  	unsigned int tmp[4];
  	int num=0,c,ok=0;
  
  	tmp[0]=tmp[1]=tmp[2]=tmp[3]=0;
  
  	for (;;)
  		{
  		c= *(str++);
  		if ((c >= '0') && (c <= '9'))
  			{
  			ok=1;
  			tmp[num]=tmp[num]*10+c-'0';
  			if (tmp[num] > 255) return(0);
  			}
  		else if (c == '.')
  			{
  			if (!ok) return(-1);
  			if (num == 3) return(0);
  			num++;
  			ok=0;
  			}
  		else if (c == '\0' && (num == 3) && ok)
  			break;
  		else
  			return(0);
  		}
  	ip[0]=tmp[0];
  	ip[1]=tmp[1];
  	ip[2]=tmp[2];
  	ip[3]=tmp[3];
  	return(1);
  	}
  
  int BIO_get_accept_socket(char *host, int bind_mode)
  	{
  	int ret=0;
  	struct sockaddr_in server,client;
  	int s=INVALID_SOCKET,cs;
  	unsigned char ip[4];
  	unsigned short port;
  	char *str=NULL,*e;
  	const char *h,*p;
  	unsigned long l;
  	int err_num;
  
  	if (BIO_sock_init() != 1) return(INVALID_SOCKET);
  
  	if ((str=BUF_strdup(host)) == NULL) return(INVALID_SOCKET);
  
  	h=p=NULL;
  	h=str;
  	for (e=str; *e; e++)
  		{
  		if (*e == ':')
  			{
  			p= &(e[1]);
  			*e='\0';
  			}
  		else if (*e == '/')
  			{
  			*e='\0';
  			break;
  			}
  		}
  
  	if (p == NULL)
  		{
  		p=h;
  		h="*";
  		}
  
  	if (!BIO_get_port(p,&port)) goto err;
  
  	memset((char *)&server,0,sizeof(server));
  	server.sin_family=AF_INET;
  	server.sin_port=htons(port);
  
  	if (strcmp(h,"*") == 0)
  		server.sin_addr.s_addr=INADDR_ANY;
  	else
  		{
                  if (!BIO_get_host_ip(h,&(ip[0]))) goto err;
  		l=(unsigned long)
  			((unsigned long)ip[0]<<24L)|
  			((unsigned long)ip[1]<<16L)|
  			((unsigned long)ip[2]<< 8L)|
  			((unsigned long)ip[3]);
  		server.sin_addr.s_addr=htonl(l);
  		}
  
  again:
  	s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
  	if (s == INVALID_SOCKET)
  		{
  		SYSerr(SYS_F_SOCKET,get_last_socket_error());
  		ERR_add_error_data(3,"port='",host,"'");
  		BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_CREATE_SOCKET);
  		goto err;
  		}
  
  #ifdef SO_REUSEADDR
  	if (bind_mode == BIO_BIND_REUSEADDR)
  		{
  		int i=1;
  
  		ret=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&i,sizeof(i));
  		bind_mode=BIO_BIND_NORMAL;
  		}
  #endif
  	if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
  		{
  #ifdef SO_REUSEADDR
  		err_num=get_last_socket_error();
  		if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
  			(err_num == EADDRINUSE))
  			{
  			memcpy((char *)&client,(char *)&server,sizeof(server));
  			if (strcmp(h,"*") == 0)
  				client.sin_addr.s_addr=htonl(0x7F000001);
  			cs=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
  			if (cs != INVALID_SOCKET)
  				{
  				int ii;
  				ii=connect(cs,(struct sockaddr *)&client,
  					sizeof(client));
  				closesocket(cs);
  				if (ii == INVALID_SOCKET)
  					{
  					bind_mode=BIO_BIND_REUSEADDR;
  					closesocket(s);
  					goto again;
  					}
  				/* else error */
  				}
  			/* else error */
  			}
  #endif
  		SYSerr(SYS_F_BIND,err_num);
  		ERR_add_error_data(3,"port='",host,"'");
  		BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_BIND_SOCKET);
  		goto err;
  		}
  	if (listen(s,MAX_LISTEN) == -1)
  		{
  		SYSerr(SYS_F_BIND,get_last_socket_error());
  		ERR_add_error_data(3,"port='",host,"'");
  		BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,BIO_R_UNABLE_TO_LISTEN_SOCKET);
  		goto err;
  		}
  	ret=1;
  err:
  	if (str != NULL) OPENSSL_free(str);
  	if ((ret == 0) && (s != INVALID_SOCKET))
  		{
  		closesocket(s);
  		s= INVALID_SOCKET;
  		}
  	return(s);
  	}
  
  int BIO_accept(int sock, char **addr)
  	{
  	int ret=INVALID_SOCKET;
  	static struct sockaddr_in from;
  	unsigned long l;
  	unsigned short port;
  	int len;
  	char *p;
  
  	memset((char *)&from,0,sizeof(from));
  	len=sizeof(from);
  	/* Note: under VMS with SOCKETSHR the fourth parameter is currently
  	 * of type (int *) whereas under other systems it is (void *) if
  	 * you don't have a cast it will choke the compiler: if you do
  	 * have a cast then you can either go for (int *) or (void *).
  	 */
  	ret=accept(sock,(struct sockaddr *)&from,(void *)&len);
  	if (ret == INVALID_SOCKET)
  		{
  		if(BIO_sock_should_retry(ret)) return -2;
  		SYSerr(SYS_F_ACCEPT,get_last_socket_error());
  		BIOerr(BIO_F_BIO_ACCEPT,BIO_R_ACCEPT_ERROR);
  		goto end;
  		}
  
  	if (addr == NULL) goto end;
  
  	l=ntohl(from.sin_addr.s_addr);
  	port=ntohs(from.sin_port);
  	if (*addr == NULL)
  		{
  		if ((p=OPENSSL_malloc(24)) == NULL)
  			{
  			BIOerr(BIO_F_BIO_ACCEPT,ERR_R_MALLOC_FAILURE);
  			goto end;
  			}
  		*addr=p;
  		}
  	BIO_snprintf(*addr,24,"%d.%d.%d.%d:%d",
  		     (unsigned char)(l>>24L)&0xff,
  		     (unsigned char)(l>>16L)&0xff,
  		     (unsigned char)(l>> 8L)&0xff,
  		     (unsigned char)(l     )&0xff,
  		     port);
  end:
  	return(ret);
  	}
  
  int BIO_set_tcp_ndelay(int s, int on)
  	{
  	int ret=0;
  #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
  	int opt;
  
  #ifdef SOL_TCP
  	opt=SOL_TCP;
  #else
  #ifdef IPPROTO_TCP
  	opt=IPPROTO_TCP;
  #endif
  #endif
  	
  	ret=setsockopt(s,opt,TCP_NODELAY,(char *)&on,sizeof(on));
  #endif
  	return(ret == 0);
  	}
  #endif
  
  int BIO_socket_nbio(int s, int mode)
  	{
  	int ret= -1;
  	int l;
  
  	l=mode;
  #ifdef FIONBIO
  	ret=BIO_socket_ioctl(s,FIONBIO,&l);
  #endif
  	return(ret == 0);
  	}
  