CURLOPT_ADDRESS_SCOPE - scope id for IPv6 addresses

Added in curl 7.19.0

0

Pass a long specifying the scope id value to use when connecting to IPv6 addresses.

#include <net/if.h> /* for if_nametoindex() */ int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode ret; long my_scope_id; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); my_scope_id = if_nametoindex("eth0"); curl_easy_setopt(curl, CURLOPT_ADDRESS_SCOPE, my_scope_id); ret = curl_easy_perform(curl); curl_easy_cleanup(curl); } }

CURLOPT_ADDRESS_SCOPE - scope id for IPv6 addresses

This functionality affects all supported protocols

curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a negative value.

CURLOPT_DEBUGFUNCTION(3), CURLOPT_STDERR(3) libcurl 2025-06-16 CURLOPT_ADDRESS_SCOPE(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ADDRESS_SCOPE, long scope);