mirror of
https://github.com/curl/curl.git
synced 2024-12-27 06:59:43 +08:00
f98344c4ae
- remove the version numbers - simplify the texts The date and version number will be put there for releases when maketgz runs the updatemanpages.pl script. Closes #11029
106 lines
4.1 KiB
Groff
106 lines
4.1 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) Max Dymond, <max.dymond@microsoft.com>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at https://curl.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" * SPDX-License-Identifier: curl
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLOPT_PREREQFUNCTION 3 "2 Aug 2021" libcurl libcurl
|
|
.SH NAME
|
|
CURLOPT_PREREQFUNCTION \- user callback called when a connection has been
|
|
established, but before a request has been made.
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
/* These are the return codes for the pre-request callback. */
|
|
#define CURL_PREREQFUNC_OK 0
|
|
#define CURL_PREREQFUNC_ABORT 1 /* fail the entire transfer */
|
|
|
|
int prereq_callback(void *clientp,
|
|
char *conn_primary_ip,
|
|
char *conn_local_ip,
|
|
int conn_primary_port,
|
|
int conn_local_port);
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PREREQFUNCTION, prereq_callback);
|
|
.SH DESCRIPTION
|
|
Pass a pointer to your callback function, which should match the prototype
|
|
shown above.
|
|
|
|
This function gets called by libcurl after a connection has been established
|
|
or a connection has been reused (including any SSL handshaking), but before any
|
|
request is actually made on the connection. For example, for HTTP, this
|
|
callback is called once a connection has been established to the server, but
|
|
before a GET/HEAD/POST/etc request has been sent.
|
|
|
|
This function may be called multiple times if redirections are enabled and are
|
|
being followed (see \fICURLOPT_FOLLOWLOCATION(3)\fP).
|
|
|
|
The callback function must return \fICURL_PREREQFUNC_OK\fP on success, or
|
|
\fICURL_PREREQFUNC_ABORT\fP to cause the transfer to fail.
|
|
|
|
This function is passed the following arguments:
|
|
.IP conn_primary_ip
|
|
A null-terminated pointer to a C string containing the primary IP of the
|
|
remote server established with this connection. For FTP, this is the IP for
|
|
the control connection. IPv6 addresses are represented without surrounding
|
|
brackets.
|
|
.IP conn_local_ip
|
|
A null-terminated pointer to a C string containing the originating IP for this
|
|
connection. IPv6 addresses are represented without surrounding brackets.
|
|
.IP conn_primary_port
|
|
The primary port number on the remote server established with this connection.
|
|
For FTP, this is the port for the control connection. This can be a TCP or a
|
|
UDP port number depending on the protocol.
|
|
.IP conn_local_port
|
|
The originating port number for this connection. This can be a TCP or a UDP
|
|
port number depending on the protocol.
|
|
.IP clientp
|
|
The pointer you set with \fICURLOPT_PREREQDATA(3)\fP.
|
|
.SH DEFAULT
|
|
By default, this is NULL and unused.
|
|
.SH PROTOCOLS
|
|
ALL
|
|
.SH EXAMPLE
|
|
.nf
|
|
static int prereq_callback(void *clientp,
|
|
char *conn_primary_ip,
|
|
char *conn_local_ip,
|
|
int conn_primary_port,
|
|
int conn_local_port)
|
|
{
|
|
printf("Connection made to %s:%s\\n", conn_primary_ip, conn_primary_port);
|
|
return CURL_PREREQFUNC_OK;
|
|
}
|
|
|
|
{
|
|
struct data prereq_data;
|
|
curl_easy_setopt(CURL *handle, CURLOPT_PREREQFUNCTION, prereq_callback);
|
|
curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, &prereq_data);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in 7.80.0
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_PREREQDATA "(3) "
|