extern int8_t dns_init(uint32_t _dns_server_ip, uint8_t _dns_server_ipv6[16], uint8_t ip_version);
/* For given URL retrieves IPv4 from DNS-server. */
extern int8_t dns_init(uint32_t _dns_server_ip, uint8_t _dns_server_ipv6[16], uint8_t ip_version);
/* For given URL retrieves IPv4 from DNS-server. */
-extern int8_t dns_get_ip(int fd, int8_t * url, uint8_t * domain_ip, uint8_t ip_version);
+extern int8_t dns_get_ip(int fd, char * url, uint8_t * domain_ip, uint8_t ip_version);
/* Handles DNS-packets, which are detected by receive_ether. */
extern int32_t handle_dns(uint8_t * packet, int32_t packetsize);
/* Handles DNS-packets, which are detected by receive_ether. */
extern int32_t handle_dns(uint8_t * packet, int32_t packetsize);