79 lines
1.6 KiB
Markdown
79 lines
1.6 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_FTP_SSL_CCC
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_FTPSSLAUTH (3)
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- CURLOPT_PROTOCOLS_STR (3)
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- CURLOPT_USE_SSL (3)
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---
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# NAME
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CURLOPT_FTP_SSL_CCC - switch off SSL again with FTP after auth
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
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long how);
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~~~
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# DESCRIPTION
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If enabled, this option makes libcurl use CCC (Clear Command Channel). It
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shuts down the SSL/TLS layer after authenticating. The rest of the control
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channel communication remains unencrypted. This allows NAT routers to follow
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the FTP transaction. Pass a long using one of the values below
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## CURLFTPSSL_CCC_NONE
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do not attempt to use CCC.
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## CURLFTPSSL_CCC_PASSIVE
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Do not initiate the shutdown, but wait for the server to do it. Do not send a
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reply.
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## CURLFTPSSL_CCC_ACTIVE
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Initiate the shutdown and wait for a reply.
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# DEFAULT
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CURLFTPSSL_CCC_NONE
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# PROTOCOLS
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FTP
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
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curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_CONTROL);
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/* go back to clear-text FTP after authenticating */
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curl_easy_setopt(curl, CURLOPT_FTP_SSL_CCC, (long)CURLFTPSSL_CCC_ACTIVE);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.16.1
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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