mirror of
https://codeberg.org/kiss-community/repo
synced 2024-12-23 07:40:11 -07:00
95 lines
3.3 KiB
Groff
95 lines
3.3 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_PREREQFUNCTION.md
|
|
.TH CURLOPT_PREREQFUNCTION 3 "2024-08-02" 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);
|
|
.fi
|
|
.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
|
|
NULL
|
|
.SH PROTOCOLS
|
|
This functionality affects all supported protocols
|
|
.SH EXAMPLE
|
|
.nf
|
|
struct priv {
|
|
void *custom;
|
|
};
|
|
|
|
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:%d\\n", conn_primary_ip, conn_primary_port);
|
|
return CURL_PREREQFUNC_OK;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
struct priv prereq_data;
|
|
CURL *curl = curl_easy_init();
|
|
if(curl) {
|
|
curl_easy_setopt(curl, CURLOPT_PREREQFUNCTION, prereq_callback);
|
|
curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data);
|
|
curl_easy_perform(curl);
|
|
}
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in curl 7.80.0
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|
|
.SH SEE ALSO
|
|
.BR CURLINFO_PRIMARY_IP (3),
|
|
.BR CURLINFO_PRIMARY_PORT (3),
|
|
.BR CURLOPT_PREREQDATA (3)
|