/* leases.h */#ifndef _LEASES_H#define _LEASES_Hstruct dhcpOfferedAddr {	uint8_t chaddr[16];	uint32_t yiaddr;	/* network order */	uint32_t expires;	/* host order */};extern uint8_t blank_chaddr[];void clear_lease(uint8_t *chaddr, uint32_t yiaddr);struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);int lease_expired(struct dhcpOfferedAddr *lease);struct dhcpOfferedAddr *oldest_expired_lease(void);struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr);struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);uint32_t find_address(int check_expired);#endif