int dhclient_create(const char *netdev,
void (*modify_request)(struct dhcp_msg *, void *aux),
bool (*validate_offer)(const struct dhcp_msg *, void *aux),
int dhclient_create(const char *netdev,
void (*modify_request)(struct dhcp_msg *, void *aux),
bool (*validate_offer)(const struct dhcp_msg *, void *aux),