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79 lines
2.6 KiB
Groff
79 lines
2.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_FTPPORT.md
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.TH CURLOPT_FTPPORT 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_FTPPORT \- make FTP transfer active
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
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.fi
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.SH DESCRIPTION
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Pass a pointer to a null\-terminated string as parameter. It specifies that the
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FTP transfer should be made actively and the given string is used to get the
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IP address to use for the FTP PORT instruction.
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The PORT instruction tells the remote server to do a TCP connect to our
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specified IP address. The string may be a plain IP address, a hostname, a
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network interface name (under Unix) or just a \(aq\-\(aq symbol to let the library
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use your system\(aqs default IP address. Default FTP operations are passive, and
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does not use the PORT command.
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The address can be followed by a \(aq:\(aq to specify a port, optionally followed by
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a \(aq\-\(aq to specify a port range. If the port specified is 0, the operating
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system picks a free port. If a range is provided and all ports in the range
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are not available, libcurl reports CURLE_FTP_PORT_FAILED for the
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handle. Invalid port/range settings are ignored. IPv6 addresses followed by a
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port or port range have to be in brackets. IPv6 addresses without port/range
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specifier can be in brackets.
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Examples with specified ports:
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.nf
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eth0:0
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192.168.1.2:32000-33000
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curl.se:32123
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[::1]:1234-4567
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.fi
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We strongly advise against specifying the address with a name, as it causes
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libcurl to do a blocking name resolve call to retrieve the IP address. That
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name resolve operation does \fBnot\fP use DNS\-over\-HTTPS even if
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\fICURLOPT_DOH_URL(3)\fP is set.
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Using anything else than "\-" for this option should typically only be done if
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you have special knowledge and confirmation that it works.
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You disable PORT again and go back to using the passive version by setting
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this option to NULL.
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The application does not have to keep the string around after setting this
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option.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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FTP
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.SH EXAMPLE
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.nf
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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,
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"ftp://example.com/old-server/file.txt");
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curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");
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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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.fi
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.SH AVAILABILITY
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Port range support was added in 7.19.5
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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.SH SEE ALSO
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.BR CURLOPT_FTP_USE_EPRT (3),
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.BR CURLOPT_FTP_USE_EPSV (3)
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