NAME¶

CURLOPT_LOCALPORT - set local port number to use for socket

SYNOPSIS¶

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORT, long port);

DESCRIPTION¶

Pass a long. This sets the local port number of the socket used for the connection. This can be used in combination with CURLOPT_INTERFACE(3) and you are recommended to use CURLOPT_LOCALPORTRANGE(3) as well when this option is set. Valid port numbers are 1 - 65535.

DEFAULT¶

0, disabled - use whatever the system thinks is fine

PROTOCOLS¶

All

EXAMPLE¶

CURL *curl = curl_easy_init();
if(curl) {


  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");


  curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);


  /* and try 20 more ports following that */


  curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);


  ret = curl_easy_perform(curl);


  curl_easy_cleanup(curl);
}

AVAILABILITY¶

Added in 7.15.2

RETURN VALUE¶

Returns CURLE_OK

SEE ALSO¶

CURLOPT_LOCALPORTRANGE(3), CURLOPT_INTERFACE(3),