CURLOPT_LOCALPORT man page

CURLOPT_LOCALPORT ā€” 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, "http://example.com/foo.bin");
  curl_easy_setopt(curl, CURLOPT_LOCALPORT, 8080L);
  /* 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),

Referenced By

curl_easy_setopt(3), CURLOPT_LOCALPORTRANGE(3).

May 31, 2017 libcurl 7.57.0 curl_easy_setopt options