BIO_get_conn_ip man page on DigitalUNIX

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BIO_s_connect(3)					      BIO_s_connect(3)

       BIO_s_connect,	      BIO_set_conn_hostname,	    BIO_set_conn_port,
       BIO_set_conn_ip,	    BIO_set_conn_int_port,	BIO_get_conn_hostname,
       BIO_get_conn_port,	 BIO_get_conn_ip,	BIO_get_conn_int_port,
       BIO_set_nbio, BIO_do_connect - Connect BIO

       #include <openssl/bio.h>

       BIO_METHOD * BIO_s_connect(
	       void	  );	   #define	 BIO_set_conn_hostname(b,name)
       BIO_ctrl(b,BIO_C_SET_CONNECT,0,(char	      *)name)	       #define
       BIO_set_conn_port(b,port) BIO_ctrl(b,BIO_C_SET_CONNECT,1,(char  *)port)
       #define	 BIO_set_conn_ip(b,ip)	  BIO_ctrl(b,BIO_C_SET_CONNECT,2,(char
       *)ip) #define  BIO_set_conn_int_port(b,port)  BIO_ctrl(b,BIO_C_SET_CON‐
       NECT,3,(char	  *)port)	#define	      BIO_get_conn_hostname(b)
       BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,0)    #define	  BIO_get_conn_port(b)
       BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,1)    #define	 BIO_get_conn_ip(b,ip)
       BIO_ptr_ctrl(b,BIO_C_SET_CONNECT,2)			       #define
       BIO_get_conn_int_port(b,port) BIO_int_ctrl(b,BIO_C_SET_CONNECT,3,port)

       #define BIO_set_nbio(b,n)     BIO_ctrl(b,BIO_C_SET_NBIO,(n),NULL)

       #define BIO_do_connect(b)     BIO_do_handshake(b)

       The  BIO_s_connect() function returns the connect BIO method. This is a
       wrapper round the platform's TCP/IP socket connection routines.

       Using connect BIOs TCP/IP connections can be made and data  transferred
       using  only  BIO routines. In this way any platform specific operations
       are hidden by the BIO abstraction.

       Read and write operations on a connect BIO  will	 perform  I/O  on  the
       underlying connection. If no connection is established and the port and
       hostname is set up properly then a connection is established first.

       Connect BIOs support BIO_puts() but not BIO_gets().

       If the close flag is set on a connect BIO then any active connection is
       shutdown and the socket closed when the BIO is freed.

       Calling	BIO_reset()  on a connect BIO will close any active connection
       and reset the BIO into a state where it can connect to  the  same  host

       The  BIO_get_fd()  function  places the underlying socket in c if it is
       not NULL. It also returns the socket . If c is not NULL it should be of
       type (int *).

       BIO_set_conn_hostname()	uses  the string name to set the hostname. The
       hostname can be an IP address. The hostname can also include  the  port
       in the form hostname:port.  It is also acceptable to use the form host‐
       name/any/other/path or hostname:port/any/other/path.

       The BIO_set_conn_port() function sets the port to port. The port can be
       the numerical form or a string such as http. A string will be looked up
       first using getservbyname() on the host platform, but if that  fails  a
       standard	 table of port names will be used. Currently the list is http,
       telnet, socks, https, ssl, ftp, gopher and wais.

       The BIO_set_conn_ip() function sets the IP address to ip	 using	binary
       form, that is four bytes specifying the IP address in big-endian form.

       The BIO_set_conn_int_port() function sets the port using port. The port
       should be of type (int *).

       The BIO_get_conn_hostname() function returns the hostname of  the  con‐
       nect BIO or NULL if the BIO is initialized but no hostname is set. This
       return value is an internal pointer which should not be modified.

       The BIO_get_conn_port() functon returns the port as a string.

       The BIO_get_conn_ip() function returns the IP address in binary form.

       The BIO_get_conn_int_port() function returns the port as an int.

       The BIO_set_nbio() function sets the non blocking I/O flag to n.	 If  n
       is  zero	 then  blocking I/O is set. If n is 1 then non blocking I/O is
       set. Blocking I/O is the default. The call to BIO_set_nbio() should  be
       made  before  the connection is established because  nonblocking I/O is
       set during the connect process.

       The BIO_do_connect() function attempts to connect the supplied BIO.  It
       returns	1  if  the connection was established successfully.  A zero or
       negative value is returned if the connection could not be  established.
       The  BIO_should_retry() function should be used for nonblocking connect
       BIOs to determine if the call should be retried.

       If blocking I/O is set, then a nonpositive return value	from  any  I/O
       call  is caused by an error condition. A zero return will normally mean
       that the connection was closed.

       If the port name is supplied as part of the host name  then  this  will
       override any value set with BIO_set_conn_port(). This might be undesir‐
       able if the application does not wish to allow connection to  arbitrary
       ports.  This  can  be avoided by checking for the presence of the colon
       (:) character in the passed hostname, and either indicating an error or
       truncating the string at that point.

       The  values  returned  by BIO_get_conn_hostname(), BIO_get_conn_port(),
       BIO_get_conn_ip(), and BIO_get_conn_int_port() are updated when a  con‐
       nection	attempt	 is  made.  Before  any	 connection attempt the values
       returned are those set by the application itself.

       Applications do not have to call BIO_do_connect() but may wish to do so
       to separate the connection process from other I/O processing.

       If  nonblocking	I/O is set then retries will be requested as appropri‐

       It addition to BIO_should_read() and BIO_should_write() it is also pos‐
       sible for BIO_should_io_special() to be true during the initial connec‐
       tion process with the reason BIO_RR_CONNECT.  If this is returned  then
       this is an indication that a connection attempt would block. The appli‐
       cation should then take appropriate action to wait until the underlying
       socket has connected and retry the call.

       BIO_s_connect() returns the connect BIO method.

       BIO_get_fd()  returns the socket or -1 if the BIO has not been initial‐

       BIO_set_conn_hostname(),	 BIO_set_conn_port(),  BIO_set_conn_ip(),  and
       BIO_set_conn_int_port() always return 1.

       BIO_get_conn_hostname()	returns the connected hostname or NULL is none
       was set.

       BIO_get_conn_port() returns a string representing the connected port or
       NULL if not set.

       BIO_get_conn_ip()  returns  a  pointer  to  the connected IP address in
       binary form or all zeros if not set.

       BIO_get_conn_int_port() returns the connected port or  0	 if  none  was

       BIO_set_nbio() always returns 1.

       BIO_do_connect()	 returns  1  if the connection was successfully estab‐
       lished and 0 or -1 if the connection failed.

       This example connects to a webserver on the local host and attempts  to
       retrieve	 a  page  and  copy the result to standard output.  BIO *cbio,
       *out; int len; char  tmpbuf[1024];  ERR_load_crypto_strings();  cbio  =
       BIO_new_connect("localhost:http");     out     =	    BIO_new_fp(stdout,
       BIO_NOCLOSE);	       if(BIO_do_connect(cbio) <= 0)  {fprintf(stderr,
       "Error connecting to server\n");		  ERR_print_errors_fp(stderr);
		 /*  whatever  ...  */		  }  BIO_puts(cbio,   "GET   /
       HTTP/1.0\n\n"); for(;;) {	   len = BIO_read(cbio, tmpbuf, 1024);
		 if(len <= 0) break;	       BIO_write(out, tmpbuf, len);  }
       BIO_free(cbio); BIO_free(out);



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