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71 lines
3.1 KiB
Groff
71 lines
3.1 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_SSL_CTX_FUNCTION 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_SSL_CTX_FUNCTION \- openssl specific callback to do SSL magic
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode ssl_ctx_callback(CURL *curl, void *ssl_ctx, void *userptr);
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CTX_FUNCTION,
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ssl_ctx_callback);
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.SH DESCRIPTION
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This option only works for libcurl powered by OpenSSL. If libcurl was built
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against another SSL library, this functionality is absent.
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Pass a pointer to your callback function, which should match the prototype
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shown above.
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This callback function gets called by libcurl just before the initialization
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of a SSL connection after having processed all other SSL related options to
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give a last chance to an application to modify the behaviour of openssl's ssl
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initialization. The \fIsslctx\fP parameter is actually a pointer to an openssl
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\fISSL_CTX\fP. If an error is returned from the callback, no attempt to
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establish a connection is made and the perform operation will return the error
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code. Set the \fIuserptr\fP argument with the \fICURLOPT_SSL_CTX_DATA(3)\fP
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option.
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This function will get called on all new connections made to a server, during
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the SSL negotiation. The SSL_CTX pointer will be a new one every time.
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To use this properly, a non-trivial amount of knowledge of the openssl
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libraries is necessary. For example, using this function allows you to use
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openssl callbacks to add additional validation code for certificates, and even
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to change the actual URI of a HTTPS request (example used in the lib509 test
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case). See also the example section for a replacement of the key, certificate
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and trust file settings.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.
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.SH EXAMPLE
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TODO
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.SH AVAILABILITY
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Added in 7.11.0. Only supported when built with OpenSSL.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_SSL_CTX_DATA "(3), " CURLOPT_SSL_VERIFYPEER "(3), "
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