Use configured bind_address for HTTPFetch

src/defaultsettings.cpp

@@ -189,7 +189,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("workaround_window_size","5");
 	settings->setDefault("max_packets_per_iteration","1024");
 	settings->setDefault("port", "30000");
-	settings->setDefault("bind_address","");
+	settings->setDefault("bind_address", "");
 	settings->setDefault("default_game", "minetest");
 	settings->setDefault("motd", "");
 	settings->setDefault("max_users", "15");

src/httpfetch.cpp

@@ -221,6 +221,11 @@ HTTPFetchOngoing::HTTPFetchOngoing(HTTPFetchRequest request_, CurlHandlePool *po
 	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 	curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 1);
 
+	std::string bind_address = g_settings->get("bind_address");
+	if (!bind_address.empty()) {
+		curl_easy_setopt(curl, CURLOPT_INTERFACE, bind_address.c_str());
+	}
+
 #if LIBCURL_VERSION_NUM >= 0x071304
 	// Restrict protocols so that curl vulnerabilities in
 	// other protocols don't affect us.