+int dns_scope_tcp_socket(DnsScope *s, int family, const union in_addr_union *address, uint16_t port);
+
+DnsScopeMatch dns_scope_good_domain(DnsScope *s, const char *domain);
+int dns_scope_good_key(DnsScope *s, DnsResourceKey *key);
+int dns_scope_good_dns_server(DnsScope *s, int family, const union in_addr_union *address);