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

 /*
  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */

 #include <stdio.h>
 #include <errno.h>

 #include "bio_lcl.h"

 #ifndef OPENSSL_NO_SOCK

 typedef struct bio_connect_st {
     int state;
     int connect_family;
     char *param_hostname;
     char *param_service;
     int connect_mode;

     BIO_ADDRINFO *addr_first;
     const BIO_ADDRINFO *addr_iter;
     /*
      * int socket; this will be kept in bio->num so that it is compatible
      * with the bss_sock bio
      */
     /*
      * called when the connection is initially made callback(BIO,state,ret);
      * The callback should return 'ret'.  state is for compatibility with the
      * ssl info_callback
      */
     int (*info_callback) (const BIO *bio, int state, int ret);
 } BIO_CONNECT;

 static int conn_write(BIO *h, const char *buf, int num);
 static int conn_read(BIO *h, char *buf, int size);
 static int conn_puts(BIO *h, const char *str);
 static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
 static int conn_new(BIO *h);
 static int conn_free(BIO *data);
 static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);

 static int conn_state(BIO *b, BIO_CONNECT *c);
 static void conn_close_socket(BIO *data);
 BIO_CONNECT *BIO_CONNECT_new(void);
 void BIO_CONNECT_free(BIO_CONNECT *a);

 #define BIO_CONN_S_BEFORE                1
 #define BIO_CONN_S_GET_ADDR              2
 #define BIO_CONN_S_CREATE_SOCKET         3
 #define BIO_CONN_S_CONNECT               4
 #define BIO_CONN_S_OK                    5
 #define BIO_CONN_S_BLOCKED_CONNECT       6

 static const BIO_METHOD methods_connectp = {
     BIO_TYPE_CONNECT,
     "socket connect",
     /* TODO: Convert to new style write function */
     bwrite_conv,
     conn_write,
     /* TODO: Convert to new style read function */
     bread_conv,
     conn_read,
     conn_puts,
     NULL,                       /* connect_gets, */
     conn_ctrl,
     conn_new,
     conn_free,
     conn_callback_ctrl,
 };

 static int conn_state(BIO *b, BIO_CONNECT *c)
 {
     int ret = -1, i;
     int (*cb) (const BIO *, int, int) = NULL;

     if (c->info_callback != NULL)
         cb = c->info_callback;

     for (;;) {
         switch (c->state) {
         case BIO_CONN_S_BEFORE:
             if (c->param_hostname == NULL && c->param_service == NULL) {
                 BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
                 ERR_add_error_data(4,
                                    "hostname=", c->param_hostname,
                                    " service=", c->param_service);
                 goto exit_loop;
             }
             c->state = BIO_CONN_S_GET_ADDR;
             break;

         case BIO_CONN_S_GET_ADDR:
             {
                 int family = AF_UNSPEC;
                 switch (c->connect_family) {
                 case BIO_FAMILY_IPV6:
                     if (1) { /* This is a trick we use to avoid bit rot.
                               * at least the "else" part will always be
                               * compiled.
                               */
 #ifdef AF_INET6
                         family = AF_INET6;
                     } else {
 #endif
                         BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
                         goto exit_loop;
                     }
                     break;
                 case BIO_FAMILY_IPV4:
                     family = AF_INET;
                     break;
                 case BIO_FAMILY_IPANY:
                     family = AF_UNSPEC;
                     break;
                 default:
                     BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
                     goto exit_loop;
                 }
                 if (BIO_lookup(c->param_hostname, c->param_service,
                                BIO_LOOKUP_CLIENT,
                                family, SOCK_STREAM, &c->addr_first) == 0)
                     goto exit_loop;
             }
             if (c->addr_first == NULL) {
                 BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
                 goto exit_loop;
             }
             c->addr_iter = c->addr_first;
             c->state = BIO_CONN_S_CREATE_SOCKET;
             break;

         case BIO_CONN_S_CREATE_SOCKET:
             ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
                              BIO_ADDRINFO_socktype(c->addr_iter),
                              BIO_ADDRINFO_protocol(c->addr_iter), 0);
             if (ret == (int)INVALID_SOCKET) {
                 SYSerr(SYS_F_SOCKET, get_last_socket_error());
                 ERR_add_error_data(4,
                                    "hostname=", c->param_hostname,
                                    " service=", c->param_service);
                 BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
                 goto exit_loop;
             }
             b->num = ret;
             c->state = BIO_CONN_S_CONNECT;
             break;

         case BIO_CONN_S_CONNECT:
             BIO_clear_retry_flags(b);
             ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
                               BIO_SOCK_KEEPALIVE | c->connect_mode);
             b->retry_reason = 0;
             if (ret == 0) {
                 if (BIO_sock_should_retry(ret)) {
                     BIO_set_retry_special(b);
                     c->state = BIO_CONN_S_BLOCKED_CONNECT;
                     b->retry_reason = BIO_RR_CONNECT;
                     ERR_clear_error();
                 } else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
                            != NULL) {
                     /*
                      * if there are more addresses to try, do that first
                      */
                     BIO_closesocket(b->num);
                     c->state = BIO_CONN_S_CREATE_SOCKET;
                     ERR_clear_error();
                     break;
                 } else {
                     SYSerr(SYS_F_CONNECT, get_last_socket_error());
                     ERR_add_error_data(4,
                                        "hostname=", c->param_hostname,
                                        " service=", c->param_service);
                     BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
                 }
                 goto exit_loop;
             } else {
                 c->state = BIO_CONN_S_OK;
             }
             break;

         case BIO_CONN_S_BLOCKED_CONNECT:
             i = BIO_sock_error(b->num);
             if (i) {
                 BIO_clear_retry_flags(b);
                 SYSerr(SYS_F_CONNECT, i);
                 ERR_add_error_data(4,
                                    "hostname=", c->param_hostname,
                                    " service=", c->param_service);
                 BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
                 ret = 0;
                 goto exit_loop;
             } else
                 c->state = BIO_CONN_S_OK;
             break;

         case BIO_CONN_S_OK:
             ret = 1;
             goto exit_loop;
         default:
             /* abort(); */
             goto exit_loop;
         }

         if (cb != NULL) {
             if ((ret = cb((BIO *)b, c->state, ret)) == 0)
                 goto end;
         }
     }

     /* Loop does not exit */
  exit_loop:
     if (cb != NULL)
         ret = cb((BIO *)b, c->state, ret);
  end:
     return (ret);
 }

 BIO_CONNECT *BIO_CONNECT_new(void)
 {
     BIO_CONNECT *ret;

     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
         return (NULL);
     ret->state = BIO_CONN_S_BEFORE;
     ret->connect_family = BIO_FAMILY_IPANY;
     return (ret);
 }

 void BIO_CONNECT_free(BIO_CONNECT *a)
 {
     if (a == NULL)
         return;

     OPENSSL_free(a->param_hostname);
     OPENSSL_free(a->param_service);
     BIO_ADDRINFO_free(a->addr_first);
     OPENSSL_free(a);
 }

 const BIO_METHOD *BIO_s_connect(void)
 {
     return (&methods_connectp);
 }

 static int conn_new(BIO *bi)
 {
     bi->init = 0;
     bi->num = (int)INVALID_SOCKET;
     bi->flags = 0;
     if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
         return (0);
     else
         return (1);
 }

 static void conn_close_socket(BIO *bio)
 {
     BIO_CONNECT *c;

     c = (BIO_CONNECT *)bio->ptr;
     if (bio->num != (int)INVALID_SOCKET) {
         /* Only do a shutdown if things were established */
         if (c->state == BIO_CONN_S_OK)
             shutdown(bio->num, 2);
         BIO_closesocket(bio->num);
         bio->num = (int)INVALID_SOCKET;
     }
 }

 static int conn_free(BIO *a)
 {
     BIO_CONNECT *data;

     if (a == NULL)
         return (0);
     data = (BIO_CONNECT *)a->ptr;

     if (a->shutdown) {
         conn_close_socket(a);
         BIO_CONNECT_free(data);
         a->ptr = NULL;
         a->flags = 0;
         a->init = 0;
     }
     return (1);
 }

 static int conn_read(BIO *b, char *out, int outl)
 {
     int ret = 0;
     BIO_CONNECT *data;

     data = (BIO_CONNECT *)b->ptr;
     if (data->state != BIO_CONN_S_OK) {
         ret = conn_state(b, data);
         if (ret <= 0)
             return (ret);
     }

     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 conn_write(BIO *b, const char *in, int inl)
 {
     int ret;
     BIO_CONNECT *data;

     data = (BIO_CONNECT *)b->ptr;
     if (data->state != BIO_CONN_S_OK) {
         ret = conn_state(b, data);
         if (ret <= 0)
             return (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 conn_ctrl(BIO *b, int cmd, long num, void *ptr)
 {
     BIO *dbio;
     int *ip;
     const char **pptr = NULL;
     long ret = 1;
     BIO_CONNECT *data;

     data = (BIO_CONNECT *)b->ptr;

     switch (cmd) {
     case BIO_CTRL_RESET:
         ret = 0;
         data->state = BIO_CONN_S_BEFORE;
         conn_close_socket(b);
         BIO_ADDRINFO_free(data->addr_first);
         data->addr_first = NULL;
         b->flags = 0;
         break;
     case BIO_C_DO_STATE_MACHINE:
         /* use this one to start the connection */
         if (data->state != BIO_CONN_S_OK)
             ret = (long)conn_state(b, data);
         else
             ret = 1;
         break;
     case BIO_C_GET_CONNECT:
         if (ptr != NULL) {
             pptr = (const char **)ptr;
             if (num == 0) {
                 *pptr = data->param_hostname;
             } else if (num == 1) {
                 *pptr = data->param_service;
             } else if (num == 2) {
                 *pptr = (const char *)BIO_ADDRINFO_address(data->addr_iter);
             } else if (num == 3) {
                 switch (BIO_ADDRINFO_family(data->addr_iter)) {
 # ifdef AF_INET6
                 case AF_INET6:
                     ret = BIO_FAMILY_IPV6;
                     break;
 # endif
                 case AF_INET:
                     ret = BIO_FAMILY_IPV4;
                     break;
                 case 0:
                     ret = data->connect_family;
                     break;
                 default:
                     ret = -1;
                     break;
                 }
             } else {
                 ret = 0;
             }
         } else {
             ret = 0;
         }
         break;
     case BIO_C_SET_CONNECT:
         if (ptr != NULL) {
             b->init = 1;
             if (num == 0) {
                 char *hold_service = data->param_service;
                 /* We affect the hostname regardless.  However, the input
                  * string might contain a host:service spec, so we must
                  * parse it, which might or might not affect the service
                  */
                 OPENSSL_free(data->param_hostname);
                 data->param_hostname = NULL;
                 ret = BIO_parse_hostserv(ptr,
                                          &data->param_hostname,
                                          &data->param_service,
                                          BIO_PARSE_PRIO_HOST);
                 if (hold_service != data->param_service)
                     OPENSSL_free(hold_service);
             } else if (num == 1) {
                 OPENSSL_free(data->param_service);
                 data->param_service = BUF_strdup(ptr);
             } else if (num == 2) {
                 const BIO_ADDR *addr = (const BIO_ADDR *)ptr;
                 if (ret) {
                     data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
                     data->param_service = BIO_ADDR_service_string(addr, 1);
                     BIO_ADDRINFO_free(data->addr_first);
                     data->addr_first = NULL;
                     data->addr_iter = NULL;
                 }
             } else if (num == 3) {
                 data->connect_family = *(int *)ptr;
             } else {
                 ret = 0;
             }
         }
         break;
     case BIO_C_SET_NBIO:
         if (num != 0)
             data->connect_mode |= BIO_SOCK_NONBLOCK;
         else
             data->connect_mode &= ~BIO_SOCK_NONBLOCK;
         break;
     case BIO_C_SET_CONNECT_MODE:
         data->connect_mode = (int)num;
         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_FLUSH:
         break;
     case BIO_CTRL_DUP:
         {
             dbio = (BIO *)ptr;
             if (data->param_hostname)
                 BIO_set_conn_hostname(dbio, data->param_hostname);
             if (data->param_service)
                 BIO_set_conn_port(dbio, data->param_service);
             BIO_set_conn_ip_family(dbio, data->connect_family);
             BIO_set_conn_mode(dbio, data->connect_mode);
             /*
              * FIXME: the cast of the function seems unlikely to be a good
              * idea
              */
             (void)BIO_set_info_callback(dbio,
                                         (bio_info_cb *)data->info_callback);
         }
         break;
     case BIO_CTRL_SET_CALLBACK:
         ret = 0; /* use callback ctrl */
         break;
     case BIO_CTRL_GET_CALLBACK:
         {
             int (**fptr) (const BIO *bio, int state, int xret);

             fptr = (int (**)(const BIO *bio, int state, int xret))ptr;
             *fptr = data->info_callback;
         }
         break;
     default:
         ret = 0;
         break;
     }
     return (ret);
 }

 static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 {
     long ret = 1;
     BIO_CONNECT *data;

     data = (BIO_CONNECT *)b->ptr;

     switch (cmd) {
     case BIO_CTRL_SET_CALLBACK:
         {
             data->info_callback =
                 (int (*)(const struct bio_st *, int, int))fp;
         }
         break;
     default:
         ret = 0;
         break;
     }
     return (ret);
 }

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

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

 BIO *BIO_new_connect(const char *str)
 {
     BIO *ret;

     ret = BIO_new(BIO_s_connect());
     if (ret == NULL)
         return (NULL);
     if (BIO_set_conn_hostname(ret, str))
         return (ret);
     BIO_free(ret);
     return (NULL);
 }

 #endif
	/*
	* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
	*
	* Licensed under the OpenSSL license (the "License"). You may not use
	* this file except in compliance with the License. You can obtain a copy
	* in the file LICENSE in the source distribution or at
	* https://www.openssl.org/source/license.html
	*/

	#include <stdio.h>
	#include <errno.h>

	#include "bio_lcl.h"

	#ifndef OPENSSL_NO_SOCK

	typedef struct bio_connect_st {
	int state;
	int connect_family;
	char *param_hostname;
	char *param_service;
	int connect_mode;

	BIO_ADDRINFO *addr_first;
	const BIO_ADDRINFO *addr_iter;
	/*
	* int socket; this will be kept in bio->num so that it is compatible
	* with the bss_sock bio
	*/
	/*
	* called when the connection is initially made callback(BIO,state,ret);
	* The callback should return 'ret'. state is for compatibility with the
	* ssl info_callback
	*/
	int (info_callback) (const BIO bio, int state, int ret);
	} BIO_CONNECT;

	static int conn_write(BIO h, const char buf, int num);
	static int conn_read(BIO h, char buf, int size);
	static int conn_puts(BIO h, const char str);
	static long conn_ctrl(BIO h, int cmd, long arg1, void arg2);
	static int conn_new(BIO *h);
	static int conn_free(BIO *data);
	static long conn_callback_ctrl(BIO h, int cmd, bio_info_cb );

	static int conn_state(BIO b, BIO_CONNECT c);
	static void conn_close_socket(BIO *data);
	BIO_CONNECT *BIO_CONNECT_new(void);
	void BIO_CONNECT_free(BIO_CONNECT *a);

	#define BIO_CONN_S_BEFORE 1
	#define BIO_CONN_S_GET_ADDR 2
	#define BIO_CONN_S_CREATE_SOCKET 3
	#define BIO_CONN_S_CONNECT 4
	#define BIO_CONN_S_OK 5
	#define BIO_CONN_S_BLOCKED_CONNECT 6

	static const BIO_METHOD methods_connectp = {
	BIO_TYPE_CONNECT,
	"socket connect",
	/* TODO: Convert to new style write function */
	bwrite_conv,
	conn_write,
	/* TODO: Convert to new style read function */
	bread_conv,
	conn_read,
	conn_puts,
	NULL, /* connect_gets, */
	conn_ctrl,
	conn_new,
	conn_free,
	conn_callback_ctrl,
	};

	static int conn_state(BIO b, BIO_CONNECT c)
	{
	int ret = -1, i;
	int (cb) (const BIO , int, int) = NULL;

	if (c->info_callback != NULL)
	cb = c->info_callback;

	for (;;) {
	switch (c->state) {
	case BIO_CONN_S_BEFORE:
	if (c->param_hostname == NULL && c->param_service == NULL) {
	BIOerr(BIO_F_CONN_STATE, BIO_R_NO_HOSTNAME_OR_SERVICE_SPECIFIED);
	ERR_add_error_data(4,
	"hostname=", c->param_hostname,
	" service=", c->param_service);
	goto exit_loop;
	}
	c->state = BIO_CONN_S_GET_ADDR;
	break;

	case BIO_CONN_S_GET_ADDR:
	{
	int family = AF_UNSPEC;
	switch (c->connect_family) {
	case BIO_FAMILY_IPV6:
	if (1) { /* This is a trick we use to avoid bit rot.
	* at least the "else" part will always be
	* compiled.
	*/
	#ifdef AF_INET6
	family = AF_INET6;
	} else {
	#endif
	BIOerr(BIO_F_CONN_STATE, BIO_R_UNAVAILABLE_IP_FAMILY);
	goto exit_loop;
	}
	break;
	case BIO_FAMILY_IPV4:
	family = AF_INET;
	break;
	case BIO_FAMILY_IPANY:
	family = AF_UNSPEC;
	break;
	default:
	BIOerr(BIO_F_CONN_STATE, BIO_R_UNSUPPORTED_IP_FAMILY);
	goto exit_loop;
	}
	if (BIO_lookup(c->param_hostname, c->param_service,
	BIO_LOOKUP_CLIENT,
	family, SOCK_STREAM, &c->addr_first) == 0)
	goto exit_loop;
	}
	if (c->addr_first == NULL) {
	BIOerr(BIO_F_CONN_STATE, BIO_R_LOOKUP_RETURNED_NOTHING);
	goto exit_loop;
	}
	c->addr_iter = c->addr_first;
	c->state = BIO_CONN_S_CREATE_SOCKET;
	break;

	case BIO_CONN_S_CREATE_SOCKET:
	ret = BIO_socket(BIO_ADDRINFO_family(c->addr_iter),
	BIO_ADDRINFO_socktype(c->addr_iter),
	BIO_ADDRINFO_protocol(c->addr_iter), 0);
	if (ret == (int)INVALID_SOCKET) {
	SYSerr(SYS_F_SOCKET, get_last_socket_error());
	ERR_add_error_data(4,
	"hostname=", c->param_hostname,
	" service=", c->param_service);
	BIOerr(BIO_F_CONN_STATE, BIO_R_UNABLE_TO_CREATE_SOCKET);
	goto exit_loop;
	}
	b->num = ret;
	c->state = BIO_CONN_S_CONNECT;
	break;

	case BIO_CONN_S_CONNECT:
	BIO_clear_retry_flags(b);
	ret = BIO_connect(b->num, BIO_ADDRINFO_address(c->addr_iter),
	BIO_SOCK_KEEPALIVE \| c->connect_mode);
	b->retry_reason = 0;
	if (ret == 0) {
	if (BIO_sock_should_retry(ret)) {
	BIO_set_retry_special(b);
	c->state = BIO_CONN_S_BLOCKED_CONNECT;
	b->retry_reason = BIO_RR_CONNECT;
	ERR_clear_error();
	} else if ((c->addr_iter = BIO_ADDRINFO_next(c->addr_iter))
	!= NULL) {
	/*
	* if there are more addresses to try, do that first
	*/
	BIO_closesocket(b->num);
	c->state = BIO_CONN_S_CREATE_SOCKET;
	ERR_clear_error();
	break;
	} else {
	SYSerr(SYS_F_CONNECT, get_last_socket_error());
	ERR_add_error_data(4,
	"hostname=", c->param_hostname,
	" service=", c->param_service);
	BIOerr(BIO_F_CONN_STATE, BIO_R_CONNECT_ERROR);
	}
	goto exit_loop;
	} else {
	c->state = BIO_CONN_S_OK;
	}
	break;

	case BIO_CONN_S_BLOCKED_CONNECT:
	i = BIO_sock_error(b->num);
	if (i) {
	BIO_clear_retry_flags(b);
	SYSerr(SYS_F_CONNECT, i);
	ERR_add_error_data(4,
	"hostname=", c->param_hostname,
	" service=", c->param_service);
	BIOerr(BIO_F_CONN_STATE, BIO_R_NBIO_CONNECT_ERROR);
	ret = 0;
	goto exit_loop;
	} else
	c->state = BIO_CONN_S_OK;
	break;

	case BIO_CONN_S_OK:
	ret = 1;
	goto exit_loop;
	default:
	/* abort(); */
	goto exit_loop;
	}

	if (cb != NULL) {
	if ((ret = cb((BIO *)b, c->state, ret)) == 0)
	goto end;
	}
	}

	/* Loop does not exit */
	exit_loop:
	if (cb != NULL)
	ret = cb((BIO *)b, c->state, ret);
	end:
	return (ret);
	}

	BIO_CONNECT *BIO_CONNECT_new(void)
	{
	BIO_CONNECT *ret;

	if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
	return (NULL);
	ret->state = BIO_CONN_S_BEFORE;
	ret->connect_family = BIO_FAMILY_IPANY;
	return (ret);
	}

	void BIO_CONNECT_free(BIO_CONNECT *a)
	{
	if (a == NULL)
	return;

	OPENSSL_free(a->param_hostname);
	OPENSSL_free(a->param_service);
	BIO_ADDRINFO_free(a->addr_first);
	OPENSSL_free(a);
	}

	const BIO_METHOD *BIO_s_connect(void)
	{
	return (&methods_connectp);
	}

	static int conn_new(BIO *bi)
	{
	bi->init = 0;
	bi->num = (int)INVALID_SOCKET;
	bi->flags = 0;
	if ((bi->ptr = (char *)BIO_CONNECT_new()) == NULL)
	return (0);
	else
	return (1);
	}

	static void conn_close_socket(BIO *bio)
	{
	BIO_CONNECT *c;

	c = (BIO_CONNECT *)bio->ptr;
	if (bio->num != (int)INVALID_SOCKET) {
	/* Only do a shutdown if things were established */
	if (c->state == BIO_CONN_S_OK)
	shutdown(bio->num, 2);
	BIO_closesocket(bio->num);
	bio->num = (int)INVALID_SOCKET;
	}
	}

	static int conn_free(BIO *a)
	{
	BIO_CONNECT *data;

	if (a == NULL)
	return (0);
	data = (BIO_CONNECT *)a->ptr;

	if (a->shutdown) {
	conn_close_socket(a);
	BIO_CONNECT_free(data);
	a->ptr = NULL;
	a->flags = 0;
	a->init = 0;
	}
	return (1);
	}

	static int conn_read(BIO b, char out, int outl)
	{
	int ret = 0;
	BIO_CONNECT *data;

	data = (BIO_CONNECT *)b->ptr;
	if (data->state != BIO_CONN_S_OK) {
	ret = conn_state(b, data);
	if (ret <= 0)
	return (ret);
	}

	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 conn_write(BIO b, const char in, int inl)
	{
	int ret;
	BIO_CONNECT *data;

	data = (BIO_CONNECT *)b->ptr;
	if (data->state != BIO_CONN_S_OK) {
	ret = conn_state(b, data);
	if (ret <= 0)
	return (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 conn_ctrl(BIO b, int cmd, long num, void ptr)
	{
	BIO *dbio;
	int *ip;
	const char **pptr = NULL;
	long ret = 1;
	BIO_CONNECT *data;

	data = (BIO_CONNECT *)b->ptr;

	switch (cmd) {
	case BIO_CTRL_RESET:
	ret = 0;
	data->state = BIO_CONN_S_BEFORE;
	conn_close_socket(b);
	BIO_ADDRINFO_free(data->addr_first);
	data->addr_first = NULL;
	b->flags = 0;
	break;
	case BIO_C_DO_STATE_MACHINE:
	/* use this one to start the connection */
	if (data->state != BIO_CONN_S_OK)
	ret = (long)conn_state(b, data);
	else
	ret = 1;
	break;
	case BIO_C_GET_CONNECT:
	if (ptr != NULL) {
	pptr = (const char **)ptr;
	if (num == 0) {
	*pptr = data->param_hostname;
	} else if (num == 1) {
	*pptr = data->param_service;
	} else if (num == 2) {
	pptr = (const char )BIO_ADDRINFO_address(data->addr_iter);
	} else if (num == 3) {
	switch (BIO_ADDRINFO_family(data->addr_iter)) {
	# ifdef AF_INET6
	case AF_INET6:
	ret = BIO_FAMILY_IPV6;
	break;
	# endif
	case AF_INET:
	ret = BIO_FAMILY_IPV4;
	break;
	case 0:
	ret = data->connect_family;
	break;
	default:
	ret = -1;
	break;
	}
	} else {
	ret = 0;
	}
	} else {
	ret = 0;
	}
	break;
	case BIO_C_SET_CONNECT:
	if (ptr != NULL) {
	b->init = 1;
	if (num == 0) {
	char *hold_service = data->param_service;
	/* We affect the hostname regardless. However, the input
	* string might contain a host:service spec, so we must
	* parse it, which might or might not affect the service
	*/
	OPENSSL_free(data->param_hostname);
	data->param_hostname = NULL;
	ret = BIO_parse_hostserv(ptr,
	&data->param_hostname,
	&data->param_service,
	BIO_PARSE_PRIO_HOST);
	if (hold_service != data->param_service)
	OPENSSL_free(hold_service);
	} else if (num == 1) {
	OPENSSL_free(data->param_service);
	data->param_service = BUF_strdup(ptr);
	} else if (num == 2) {
	const BIO_ADDR addr = (const BIO_ADDR )ptr;
	if (ret) {
	data->param_hostname = BIO_ADDR_hostname_string(addr, 1);
	data->param_service = BIO_ADDR_service_string(addr, 1);
	BIO_ADDRINFO_free(data->addr_first);
	data->addr_first = NULL;
	data->addr_iter = NULL;
	}
	} else if (num == 3) {
	data->connect_family = (int )ptr;
	} else {
	ret = 0;
	}
	}
	break;
	case BIO_C_SET_NBIO:
	if (num != 0)
	data->connect_mode \|= BIO_SOCK_NONBLOCK;
	else
	data->connect_mode &= ~BIO_SOCK_NONBLOCK;
	break;
	case BIO_C_SET_CONNECT_MODE:
	data->connect_mode = (int)num;
	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_FLUSH:
	break;
	case BIO_CTRL_DUP:
	{
	dbio = (BIO *)ptr;
	if (data->param_hostname)
	BIO_set_conn_hostname(dbio, data->param_hostname);
	if (data->param_service)
	BIO_set_conn_port(dbio, data->param_service);
	BIO_set_conn_ip_family(dbio, data->connect_family);
	BIO_set_conn_mode(dbio, data->connect_mode);
	/*
	* FIXME: the cast of the function seems unlikely to be a good
	* idea
	*/
	(void)BIO_set_info_callback(dbio,
	(bio_info_cb *)data->info_callback);
	}
	break;
	case BIO_CTRL_SET_CALLBACK:
	ret = 0; /* use callback ctrl */
	break;
	case BIO_CTRL_GET_CALLBACK:
	{
	int (*fptr) (const BIO bio, int state, int xret);

	fptr = (int (*)(const BIO bio, int state, int xret))ptr;
	*fptr = data->info_callback;
	}
	break;
	default:
	ret = 0;
	break;
	}
	return (ret);
	}

	static long conn_callback_ctrl(BIO b, int cmd, bio_info_cb fp)
	{
	long ret = 1;
	BIO_CONNECT *data;

	data = (BIO_CONNECT *)b->ptr;

	switch (cmd) {
	case BIO_CTRL_SET_CALLBACK:
	{
	data->info_callback =
	(int ()(const struct bio_st , int, int))fp;
	}
	break;
	default:
	ret = 0;
	break;
	}
	return (ret);
	}

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

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

	BIO BIO_new_connect(const char str)
	{
	BIO *ret;

	ret = BIO_new(BIO_s_connect());
	if (ret == NULL)
	return (NULL);
	if (BIO_set_conn_hostname(ret, str))
	return (ret);
	BIO_free(ret);
	return (NULL);
	}

	#endif