100 lines
2.6 KiB
Markdown
100 lines
2.6 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_FTPPORT
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLOPT_FTP_USE_EPRT (3)
|
||
|
|
- CURLOPT_FTP_USE_EPSV (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_FTPPORT - make FTP transfer active
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
Pass a pointer to a null-terminated string as parameter. It specifies that the
|
||
|
|
FTP transfer should be made actively and the given string is used to get the
|
||
|
|
IP address to use for the FTP PORT instruction.
|
||
|
|
|
||
|
|
The PORT instruction tells the remote server to do a TCP connect to our
|
||
|
|
specified IP address. The string may be a plain IP address, a hostname, a
|
||
|
|
network interface name (under Unix) or just a '-' symbol to let the library
|
||
|
|
use your system's default IP address. Default FTP operations are passive, and
|
||
|
|
does not use the PORT command.
|
||
|
|
|
||
|
|
The address can be followed by a ':' to specify a port, optionally followed by
|
||
|
|
a '-' to specify a port range. If the port specified is 0, the operating
|
||
|
|
system picks a free port. If a range is provided and all ports in the range
|
||
|
|
are not available, libcurl reports CURLE_FTP_PORT_FAILED for the
|
||
|
|
handle. Invalid port/range settings are ignored. IPv6 addresses followed by a
|
||
|
|
port or port range have to be in brackets. IPv6 addresses without port/range
|
||
|
|
specifier can be in brackets.
|
||
|
|
|
||
|
|
Examples with specified ports:
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
eth0:0
|
||
|
|
192.168.1.2:32000-33000
|
||
|
|
curl.se:32123
|
||
|
|
[::1]:1234-4567
|
||
|
|
~~~
|
||
|
|
|
||
|
|
We strongly advise against specifying the address with a name, as it causes
|
||
|
|
libcurl to do a blocking name resolve call to retrieve the IP address. That
|
||
|
|
name resolve operation does **not** use DNS-over-HTTPS even if
|
||
|
|
CURLOPT_DOH_URL(3) is set.
|
||
|
|
|
||
|
|
Using anything else than "-" for this option should typically only be done if
|
||
|
|
you have special knowledge and confirmation that it works.
|
||
|
|
|
||
|
|
You disable PORT again and go back to using the passive version by setting
|
||
|
|
this option to NULL.
|
||
|
|
|
||
|
|
The application does not have to keep the string around after setting this
|
||
|
|
option.
|
||
|
|
|
||
|
|
# DEFAULT
|
||
|
|
|
||
|
|
NULL
|
||
|
|
|
||
|
|
# PROTOCOLS
|
||
|
|
|
||
|
|
FTP
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
CURL *curl = curl_easy_init();
|
||
|
|
if(curl) {
|
||
|
|
CURLcode res;
|
||
|
|
curl_easy_setopt(curl, CURLOPT_URL,
|
||
|
|
"ftp://example.com/old-server/file.txt");
|
||
|
|
curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");
|
||
|
|
res = curl_easy_perform(curl);
|
||
|
|
curl_easy_cleanup(curl);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Port range support was added in 7.19.5
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
|
||
|
|
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
|