Tribblix: manual page: CURLOPT_FTP_SKIP_PASV

CURLOPT_FTP_SKIP_PASV_IP(3) Introduction to Library Functions

NAME

CURLOPT_FTP_SKIP_PASV_IP - ignore the IP address in the PASV response

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SKIP_PASV_IP, long skip);

DESCRIPTION

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
reuses the same IP address it already uses for the control
connection. It still uses the port number from the 227-response.

This option allows libcurl to work around broken server installations
or funny network setups that due to NATs, firewalls or incompetence
report the wrong IP address. Setting this 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
PASV.

DEFAULT

1 since 7.74.0, was 0 before then.

PROTOCOLS

This functionality affects ftp only

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
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);
res = curl_easy_perform(curl);

curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.15.0

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).