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Diffstat (limited to 'docs/libcurl/opts/GNURLOPT_CONNECT_TO.3')
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1 files changed, 111 insertions, 0 deletions
diff --git a/docs/libcurl/opts/GNURLOPT_CONNECT_TO.3 b/docs/libcurl/opts/GNURLOPT_CONNECT_TO.3 new file mode 100644 index 000000000..999fca1a5 --- /dev/null +++ b/docs/libcurl/opts/GNURLOPT_CONNECT_TO.3 @@ -0,0 +1,111 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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. +.\" * +.\" ************************************************************************** +.\" +.TH GNURLOPT_CONNECT_TO 3 "10 April 2016" "libcurl 7.49.0" "curl_easy_setopt options" +.SH NAME +CURLOPT_CONNECT_TO \- Connect to a specific host and port instead of the URL's host and port +.SH SYNOPSIS +.nf +#include <gnurl/curl.h> + +CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECT_TO, + struct curl_slist *connect_to); +.fi +.SH DESCRIPTION +Pass a pointer to a linked list of strings with "connect to" information to +use for establishing network connections with this handle. The linked list +should be a fully valid list of \fBstruct curl_slist\fP structs properly +filled in. Use \fIcurl_slist_append(3)\fP to create the list and +\fIcurl_slist_free_all(3)\fP to clean up an entire list. + +Each single string should be written using the format +HOST:PORT:CONNECT-TO-HOST:CONNECT-TO-PORT where HOST is the host of the +request, PORT is the port of the request, CONNECT-TO-HOST is the host name to +connect to, and CONNECT-TO-PORT is the port to connect to. + +The first string that matches the request's host and port is used. + +Dotted numerical IP addresses are supported for HOST and CONNECT-TO-HOST. +A numerical IPv6 address must be written within [brackets]. + +Any of the four values may be empty. When the HOST or PORT is empty, the host +or port will always match (the request's host or port is ignored). +When CONNECT-TO-HOST or CONNECT-TO-PORT is empty, the "connect to" feature +will be disabled for the host or port, and the request's host or port will be +used to establish the network connection. + +This option is suitable to direct the request at a specific server, e.g. at a +specific cluster node in a cluster of servers. + +The "connect to" host and port are only used to establish the network +connection. They do NOT affect the host and port that are used for TLS/SSL +(e.g. SNI, certificate verification) or for the application protocols. + +In contrast to \fICURLOPT_RESOLVE(3)\fP, the option +\fICURLOPT_CONNECT_TO(3)\fP does not pre-populate the DNS cache and therefore +it does not affect future transfers of other easy handles that have been added +to the same multi handle. + +The "connect to" host and port are ignored if they are equal to the host and +the port in the request URL, because connecting to the host and the port in +the request URL is the default behavior. + +If an HTTP proxy is used for a request having a special "connect to" host or +port, and the "connect to" host or port differs from the request's host and +port, the HTTP proxy is automatically switched to tunnel mode for this +specific request. This is necessary because it is not possible to connect to a +specific host or port in normal (non-tunnel) mode. + +When this option is passed to \fIcurl_easy_setopt(3)\fP, libcurl will not copy +the entire list so you \fBmust\fP keep it around until you no longer use this +\fIhandle\fP for a transfer before you call \fIcurl_slist_free_all(3)\fP on +the list. + +.SH DEFAULT +NULL +.SH PROTOCOLS +All +.SH EXAMPLE +.nf +CURL *curl; +struct curl_slist *connect_to = NULL; +connect_to = curl_slist_append(NULL, "example.com::server1.example.com:"); + +curl = curl_easy_init(); +if(curl) { + curl_easy_setopt(curl, CURLOPT_CONNECT_TO, connect_to); + curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); + + curl_easy_perform(curl); + + /* always cleanup */ + curl_easy_cleanup(curl); +} + +curl_slist_free_all(connect_to); +.fi +.SH AVAILABILITY +Added in 7.49.0 +.SH RETURN VALUE +Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. +.SH "SEE ALSO" +.BR CURLOPT_URL "(3), " CURLOPT_RESOLVE "(3), " CURLOPT_FOLLOWLOCATION "(3), " CURLOPT_HTTPPROXYTUNNEL "(3), " |