326 lines
12 KiB
Groff
326 lines
12 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BIO_s_connect 3"
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.TH BIO_s_connect 3 "2016-03-01" "1.0.2g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_s_connect, BIO_new_connect, BIO_set_conn_hostname, BIO_set_conn_port,
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BIO_set_conn_ip, BIO_set_conn_int_port, BIO_get_conn_hostname,
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BIO_get_conn_port, BIO_get_conn_ip, BIO_get_conn_int_port,
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BIO_set_nbio, BIO_do_connect \- connect BIO
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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\&
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\& BIO_METHOD * BIO_s_connect(void);
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\&
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\& BIO *BIO_new_connect(char *name);
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\&
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\& long BIO_set_conn_hostname(BIO *b, char *name);
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\& long BIO_set_conn_port(BIO *b, char *port);
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\& long BIO_set_conn_ip(BIO *b, char *ip);
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\& long BIO_set_conn_int_port(BIO *b, char *port);
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\& char *BIO_get_conn_hostname(BIO *b);
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\& char *BIO_get_conn_port(BIO *b);
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\& char *BIO_get_conn_ip(BIO *b);
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\& long BIO_get_conn_int_port(BIO *b);
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\&
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\& long BIO_set_nbio(BIO *b, long n);
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\&
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\& int BIO_do_connect(BIO *b);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_s_connect()\fR returns the connect \s-1BIO\s0 method. This is a wrapper
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round the platform's \s-1TCP/IP\s0 socket connection routines.
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.PP
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Using connect BIOs, \s-1TCP/IP\s0 connections can be made and data
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transferred using only \s-1BIO\s0 routines. In this way any platform
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specific operations are hidden by the \s-1BIO\s0 abstraction.
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.PP
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Read and write operations on a connect \s-1BIO\s0 will perform I/O
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on the underlying connection. If no connection is established
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and the port and hostname (see below) is set up properly then
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a connection is established first.
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.PP
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Connect BIOs support \fIBIO_puts()\fR but not \fIBIO_gets()\fR.
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.PP
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If the close flag is set on a connect \s-1BIO\s0 then any active
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connection is shutdown and the socket closed when the \s-1BIO\s0
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is freed.
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.PP
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Calling \fIBIO_reset()\fR on a connect \s-1BIO\s0 will close any active
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connection and reset the \s-1BIO\s0 into a state where it can connect
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to the same host again.
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.PP
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\&\fIBIO_get_fd()\fR places the underlying socket in \fBc\fR if it is not \s-1NULL,\s0
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it also returns the socket . If \fBc\fR is not \s-1NULL\s0 it should be of
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type (int *).
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.PP
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\&\fIBIO_set_conn_hostname()\fR uses the string \fBname\fR to set the hostname.
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The hostname can be an \s-1IP\s0 address. The hostname can also include the
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port in the form hostname:port . It is also acceptable to use the
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form \*(L"hostname/any/other/path\*(R" or \*(L"hostname:port/any/other/path\*(R".
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.PP
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\&\fIBIO_set_conn_port()\fR sets the port to \fBport\fR. \fBport\fR can be the
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numerical form or a string such as \*(L"http\*(R". A string will be looked
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up first using \fIgetservbyname()\fR on the host platform but if that
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fails a standard table of port names will be used. Currently the
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list is http, telnet, socks, https, ssl, ftp, gopher and wais.
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.PP
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\&\fIBIO_set_conn_ip()\fR sets the \s-1IP\s0 address to \fBip\fR using binary form,
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that is four bytes specifying the \s-1IP\s0 address in big-endian form.
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.PP
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\&\fIBIO_set_conn_int_port()\fR sets the port using \fBport\fR. \fBport\fR should
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be of type (int *).
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.PP
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\&\fIBIO_get_conn_hostname()\fR returns the hostname of the connect \s-1BIO\s0 or
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\&\s-1NULL\s0 if the \s-1BIO\s0 is initialized but no hostname is set.
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This return value is an internal pointer which should not be modified.
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.PP
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\&\fIBIO_get_conn_port()\fR returns the port as a string.
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.PP
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\&\fIBIO_get_conn_ip()\fR returns the \s-1IP\s0 address in binary form.
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.PP
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\&\fIBIO_get_conn_int_port()\fR returns the port as an int.
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.PP
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\&\fIBIO_set_nbio()\fR sets the non blocking I/O flag to \fBn\fR. If \fBn\fR is
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zero then blocking I/O is set. If \fBn\fR is 1 then non blocking I/O
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is set. Blocking I/O is the default. The call to \fIBIO_set_nbio()\fR
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should be made before the connection is established because
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non blocking I/O is set during the connect process.
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.PP
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\&\fIBIO_new_connect()\fR combines \fIBIO_new()\fR and \fIBIO_set_conn_hostname()\fR into
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a single call: that is it creates a new connect \s-1BIO\s0 with \fBname\fR.
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.PP
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\&\fIBIO_do_connect()\fR attempts to connect the supplied \s-1BIO.\s0 It returns 1
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if the connection was established successfully. A zero or negative
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value is returned if the connection could not be established, the
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call \fIBIO_should_retry()\fR should be used for non blocking connect BIOs
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to determine if the call should be retried.
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.SH "NOTES"
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.IX Header "NOTES"
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If blocking I/O is set then a non positive return value from any
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I/O call is caused by an error condition, although a zero return
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will normally mean that the connection was closed.
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.PP
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If the port name is supplied as part of the host name then this will
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override any value set with \fIBIO_set_conn_port()\fR. This may be undesirable
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if the application does not wish to allow connection to arbitrary
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ports. This can be avoided by checking for the presence of the ':'
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character in the passed hostname and either indicating an error or
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truncating the string at that point.
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.PP
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The values returned by \fIBIO_get_conn_hostname()\fR, \fIBIO_get_conn_port()\fR,
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\&\fIBIO_get_conn_ip()\fR and \fIBIO_get_conn_int_port()\fR are updated when a
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connection attempt is made. Before any connection attempt the values
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returned are those set by the application itself.
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.PP
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Applications do not have to call \fIBIO_do_connect()\fR but may wish to do
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so to separate the connection process from other I/O processing.
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.PP
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If non blocking I/O is set then retries will be requested as appropriate.
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.PP
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It addition to \fIBIO_should_read()\fR and \fIBIO_should_write()\fR it is also
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possible for \fIBIO_should_io_special()\fR to be true during the initial
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connection process with the reason \s-1BIO_RR_CONNECT.\s0 If this is returned
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then this is an indication that a connection attempt would block,
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the application should then take appropriate action to wait until
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the underlying socket has connected and retry the call.
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.PP
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\&\fIBIO_set_conn_hostname()\fR, \fIBIO_set_conn_port()\fR, \fIBIO_set_conn_ip()\fR,
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\&\fIBIO_set_conn_int_port()\fR, \fIBIO_get_conn_hostname()\fR, \fIBIO_get_conn_port()\fR,
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\&\fIBIO_get_conn_ip()\fR, \fIBIO_get_conn_int_port()\fR, \fIBIO_set_nbio()\fR and
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\&\fIBIO_do_connect()\fR are macros.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_s_connect()\fR returns the connect \s-1BIO\s0 method.
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.PP
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\&\fIBIO_get_fd()\fR returns the socket or \-1 if the \s-1BIO\s0 has not
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been initialized.
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.PP
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\&\fIBIO_set_conn_hostname()\fR, \fIBIO_set_conn_port()\fR, \fIBIO_set_conn_ip()\fR and
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\&\fIBIO_set_conn_int_port()\fR always return 1.
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.PP
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\&\fIBIO_get_conn_hostname()\fR returns the connected hostname or \s-1NULL\s0 is
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none was set.
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.PP
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\&\fIBIO_get_conn_port()\fR returns a string representing the connected
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port or \s-1NULL\s0 if not set.
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.PP
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\&\fIBIO_get_conn_ip()\fR returns a pointer to the connected \s-1IP\s0 address in
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binary form or all zeros if not set.
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.PP
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\&\fIBIO_get_conn_int_port()\fR returns the connected port or 0 if none was
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set.
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.PP
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\&\fIBIO_set_nbio()\fR always returns 1.
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.PP
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\&\fIBIO_do_connect()\fR returns 1 if the connection was successfully
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established and 0 or \-1 if the connection failed.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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This is example connects to a webserver on the local host and attempts
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to retrieve a page and copy the result to standard output.
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.PP
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.Vb 10
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\& BIO *cbio, *out;
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\& int len;
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\& char tmpbuf[1024];
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\& ERR_load_crypto_strings();
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\& cbio = BIO_new_connect("localhost:http");
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\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
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\& if(BIO_do_connect(cbio) <= 0) {
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\& fprintf(stderr, "Error connecting to server\en");
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\& ERR_print_errors_fp(stderr);
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\& /* whatever ... */
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\& }
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\& BIO_puts(cbio, "GET / HTTP/1.0\en\en");
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\& for(;;) {
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\& len = BIO_read(cbio, tmpbuf, 1024);
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\& if(len <= 0) break;
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\& BIO_write(out, tmpbuf, len);
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\& }
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\& BIO_free(cbio);
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\& BIO_free(out);
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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