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CURLOPT_SOCKS5_GSSAPI_NEC - set socks proxy gssapi negotiation protection #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_GSSAPI_NEC, long nec); Pass a long set to 1 to enable or 0 to disable. As part of the gssapi negotiation a protection mode is negotiated. The RFC1961 says in section 4.3/4.4 it should be protected, but the NEC reference implementation does not. If enabled, this option allows the unprotected exchange of the protection mode negotiation. ? Most

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_NEC, 1L);
 ret = curl_easy_perform(curl);
 curl_easy_cleanup(curl);
}

Added in 7.19.4 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. CURLOPT_SOCKS5_GSSAPI_SERVICE "(3), " CURLOPT_PROXY "(3), "