notify that root access is required

src/main.c

@@ -336,6 +336,11 @@ int main(int argc, char** argv)
 	signal(SIGCHLD, handle_children);
 	signal(SIGALRM, handle_alarm);
 
+	if (getuid() != 0) {
+		fprintf(stderr, "This server requires root access to operate.\n");
+		exit(1);
+	}
+
 	/* load configuration */
 	ret = cmd_parser(argc, argv, &config);
 	if (ret < 0) {