DnsServer* manager_find_dns_server(Manager *m, unsigned char family, union in_addr_union *in_addr);
DnsServer *manager_get_dns_server(Manager *m);
void manager_next_dns_server(Manager *m);
+uint32_t manager_find_mtu(Manager *m);
int manager_dns_ipv4_fd(Manager *m);
int manager_dns_ipv4_send(Manager *m, DnsServer *srv, int ifindex, DnsPacket *p);