CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_GSSAPI_SERVICE, char *name);
Pass a char * as parameter to a string holding the name of the service. The default service name for a SOCKS5 server is "rcmd". This option allows you to change it.
The application does not have to keep the string around after setting this option.
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_PROXY, "socks5://proxy");
curl_easy_setopt(curl, CURLOPT_SOCKS5_GSSAPI_SERVICE, "rcmd-special");
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}