int sd_dhcp_client_set_hostname(sd_dhcp_client *client, const char *hostname);
int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, const char *vci);
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret);
int sd_dhcp_client_set_hostname(sd_dhcp_client *client, const char *hostname);
int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, const char *vci);
int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret);