crypto/bio/b_sock.c - third_party/openssl - Git at Google

 /* 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.]
  */

 #ifndef NO_SOCK

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

 #ifdef WIN16
 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
 #else
 #define SOCKET_PROTOCOL IPPROTO_TCP
 #endif

 #ifdef SO_MAXCONN
 #define MAX_LISTEN  SOMAXCONN
 #elif defined(SO_MAXCONN)
 #define MAX_LISTEN  SO_MAXCONN
 #else
 #define MAX_LISTEN  32
 #endif

 #ifdef WINDOWS
 static int wsa_init_done=0;
 #endif

 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];

 static int get_ip(const char *str,unsigned char *ip);
 static void ghbn_free(struct hostent *a);
 static struct hostent *ghbn_dup(struct hostent *a);
 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);
 	}

 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);
 	}

 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);
 	}

 struct hostent *BIO_gethostbyname(const char *name)
 	{
 	struct hostent *ret;
 	int i,lowi=0,j;
 	unsigned long low= (unsigned long)-1;

 /*	return(gethostbyname(name)); */

 #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);
 	}

 int BIO_sock_init(void)
 	{
 #ifdef WINDOWS
 	static struct WSAData wsa_state;

 	if (!wsa_init_done)
 		{
 		int err;

 #ifdef SIGINT
 		signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
 #endif
 		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 /* WINDOWS */
 	return(1);
 	}

 void BIO_sock_cleanup(void)
 	{
 #ifdef WINDOWS
 	if (wsa_init_done)
 		{
 		wsa_init_done=0;
 		WSACancelBlockingCall();
 		WSACleanup();
 		}
 #endif
 	}

 #if !defined(VMS) || __VMS_VER >= 70000000

 int BIO_socket_ioctl(int fd, long type, unsigned long *arg)
 	{
 	int i;

 	i=ioctlsocket(fd,type,arg);
 	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(-1);
 			}
 		else if (c == '.')
 			{
 			if (!ok) return(-1);
 			if (num == 3) break;
 			num++;
 			ok=0;
 			}
 		else if ((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;
 		}
 	sprintf(*addr,"%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;
 	unsigned long l;

 	l=mode;
 #ifdef FIONBIO
 	ret=BIO_socket_ioctl(s,FIONBIO,&l);
 #endif
 	return(ret == 0);
 	}
	/* 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.]
	*/

	#ifndef NO_SOCK

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

	#ifdef WIN16
	#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
	#else
	#define SOCKET_PROTOCOL IPPROTO_TCP
	#endif

	#ifdef SO_MAXCONN
	#define MAX_LISTEN SOMAXCONN
	#elif defined(SO_MAXCONN)
	#define MAX_LISTEN SO_MAXCONN
	#else
	#define MAX_LISTEN 32
	#endif

	#ifdef WINDOWS
	static int wsa_init_done=0;
	#endif

	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];

	static int get_ip(const char str,unsigned char ip);
	static void ghbn_free(struct hostent *a);
	static struct hostent ghbn_dup(struct hostent a);
	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);
	}

	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);
	}

	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(isizeof(char *));
	if (ret->h_aliases == NULL)
	goto err;
	memset(ret->h_aliases, 0, isizeof(char ));

	for (i=0; a->h_addr_list[i] != NULL; i++)
	;
	i++;
	ret->h_addr_list=(char *)OPENSSL_malloc(isizeof(char *));
	if (ret->h_addr_list == NULL)
	goto err;
	memset(ret->h_addr_list, 0, isizeof(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);
	}

	struct hostent BIO_gethostbyname(const char name)
	{
	struct hostent *ret;
	int i,lowi=0,j;
	unsigned long low= (unsigned long)-1;

	/* return(gethostbyname(name)); */

	#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);
	}

	int BIO_sock_init(void)
	{
	#ifdef WINDOWS
	static struct WSAData wsa_state;

	if (!wsa_init_done)
	{
	int err;

	#ifdef SIGINT
	signal(SIGINT,(void (*)(int))BIO_sock_cleanup);
	#endif
	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 /* WINDOWS */
	return(1);
	}

	void BIO_sock_cleanup(void)
	{
	#ifdef WINDOWS
	if (wsa_init_done)
	{
	wsa_init_done=0;
	WSACancelBlockingCall();
	WSACleanup();
	}
	#endif
	}

	#if !defined(VMS) \|\| __VMS_VER >= 70000000

	int BIO_socket_ioctl(int fd, long type, unsigned long *arg)
	{
	int i;

	i=ioctlsocket(fd,type,arg);
	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(-1);
	}
	else if (c == '.')
	{
	if (!ok) return(-1);
	if (num == 3) break;
	num++;
	ok=0;
	}
	else if ((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;
	}
	sprintf(*addr,"%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;
	unsigned long l;

	l=mode;
	#ifdef FIONBIO
	ret=BIO_socket_ioctl(s,FIONBIO,&l);
	#endif
	return(ret == 0);
	}