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CURLOPT_FTP_SKIP_PASV_IP(3) curl_easy_setopt options
CURLOPT_FTP_SKIP_PASV_IP - ignore the IP address in the PASV response
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SKIP_PASV_IP, long skip);
Pass a long. If skip is set to 1, it instructs libcurl to not use the
IP address the server suggests in its 227-response to libcurl's PASV
command when libcurl connects the data connection. Instead libcurl will
re-use the same IP address it already uses for the control connection.
But it will use the port number from the 227-response.
This option thus allows libcurl to work around broken server
installations that due to NATs, firewalls or incompetence report the
wrong IP address back. Setting the option also reduces the risk for
various sorts of client abuse by malicious servers.
This option has no effect if PORT, EPRT or EPSV is used instead of
1 since 7.74.0, was 0 before then.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
/* please ignore the IP in the PASV response */
curl_easy_setopt(curl, CURLOPT_FTP_SKIP_PASV_IP, 1L);
ret = curl_easy_perform(curl);
Added in 7.14.2
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
libcurl 7.83.1 November 26, 2021 CURLOPT_FTP_SKIP_PASV_IP(3)