1CURLOPT_FTPPORT(3) curl_easy_setopt options CURLOPT_FTPPORT(3)
2
3
4
6 CURLOPT_FTPPORT - make FTP transfer active
7
9 #include <curl/curl.h>
10
11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
12
14 Pass a pointer to a null-terminated string as parameter. It specifies
15 that the FTP transfer will be made actively and the given string will
16 be used to get the IP address to use for the FTP PORT instruction.
17
18 The PORT instruction tells the remote server to connect to our speci‐
19 fied IP address. The string may be a plain IP address, a host name, a
20 network interface name (under Unix) or just a '-' symbol to let the li‐
21 brary use your system's default IP address. Default FTP operations are
22 passive, and thus will not use PORT.
23
24 The address can be followed by a ':' to specify a port, optionally fol‐
25 lowed by a '-' to specify a port range. If the port specified is 0,
26 the operating system will pick a free port. If a range is provided and
27 all ports in the range are not available, libcurl will report
28 CURLE_FTP_PORT_FAILED for the handle. Invalid port/range settings are
29 ignored. IPv6 addresses followed by a port or portrange have to be in
30 brackets. IPv6 addresses without port/range specifier can be in brack‐
31 ets.
32
33 Examples with specified ports:
34
35 eth0:0
36 192.168.1.2:32000-33000
37 curl.se:32123
38 [::1]:1234-4567
39
40 You disable PORT again and go back to using the passive version by set‐
41 ting this option to NULL.
42
43 The application does not have to keep the string around after setting
44 this option.
45
47 NULL
48
50 FTP
51
53 CURL *curl = curl_easy_init();
54 if(curl) {
55 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/old-server/file.txt");
56 curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");
57 ret = curl_easy_perform(curl);
58 curl_easy_cleanup(curl);
59 }
60
62 Port range support was added in 7.19.5
63
65 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
66 not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
67
69 CURLOPT_FTP_USE_EPRT(3), CURLOPT_FTP_USE_EPSV(3),
70
71
72
73libcurl 7.82.0 November 26, 2021 CURLOPT_FTPPORT(3)