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/* vi: set sw=4 ts=4: */
/* dhcpd.h */
#ifndef UDHCP_DHCPD_H
#define UDHCP_DHCPD_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
/************************************/
/* Defaults _you_ may want to tweak */
/************************************/
/* the period of time the client is allowed to use that address */
#define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
#define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
/* where to find the DHCP server configuration file */
#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
struct option_set {
uint8_t *data;
struct option_set *next;
};
struct static_lease {
struct static_lease *next;
uint32_t ip;
uint8_t mac[6];
};
struct server_config_t {
uint32_t server; /* Our IP, in network order */
#if ENABLE_FEATURE_UDHCP_PORT
uint16_t port;
#endif
/* start,end are in host order: we need to compare start <= ip <= end */
uint32_t start_ip; /* Start address of leases, in host order */
uint32_t end_ip; /* End of leases, in host order */
struct option_set *options; /* List of DHCP options loaded from the config file */
char *interface; /* The name of the interface to use */
int ifindex; /* Index number of the interface to use */
uint8_t arp[6]; /* Our arp address */
// disabled: dumpleases has no way of knowing this value,
// and will break if it's off. Now it's on always.
// char remaining; /* Should the lease time in lease file
// * be written as lease time remaining, or
// * as the absolute time the lease expires */
uint32_t lease; /* lease time in seconds (host order) */
uint32_t max_leases; /* maximum number of leases (including reserved address) */
uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
* if this is zero, it will only write one on SIGUSR1 */
uint32_t decline_time; /* how long an address is reserved if a client returns a
* decline message */
uint32_t conflict_time; /* how long an arp conflict offender is leased for */
uint32_t offer_time; /* how long an offered address is reserved */
uint32_t min_lease; /* minimum lease time a client can request */
uint32_t siaddr; /* next server bootp option */
char *lease_file;
char *pidfile;
char *notify_file; /* What to run whenever leases are written */
char *sname; /* bootp server name */
char *boot_file; /* bootp boot file option */
struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
};
#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
/* client_config sits in 2nd half of bb_common_bufsiz1 */
#if ENABLE_FEATURE_UDHCP_PORT
#define SERVER_PORT (server_config.port)
#else
#define SERVER_PORT 67
#endif
/*** leases.h ***/
typedef uint32_t leasetime_t;
typedef int32_t signed_leasetime_t;
struct dhcpOfferedAddr {
uint8_t chaddr[16];
/* In network order */
uint32_t yiaddr;
/* Unix time when lease expires, regardless of value of
* server_config.remaining. Kept in memory in host order.
* When written to file, converted to network order
* and optionally adjusted (current time subtracted)
* if server_config.remaining = 1 */
leasetime_t expires;
uint8_t hostname[20]; /* (size is a multiply of 4) */
};
extern struct dhcpOfferedAddr *leases;
struct dhcpOfferedAddr *add_lease(
const uint8_t *chaddr, uint32_t yiaddr,
leasetime_t leasetime, uint8_t *hostname
) FAST_FUNC;
int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
uint32_t find_free_or_expired_address(void) FAST_FUNC;
/*** static_leases.h ***/
/* Config file will pass static lease info to this function which will add it
* to a data structure that can be searched later */
void addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip) FAST_FUNC;
/* Check to see if a mac has an associated static lease */
uint32_t getIpByMac(struct static_lease *lease_struct, void *arg) FAST_FUNC;
/* Check to see if an ip is reserved as a static ip */
int reservedIp(struct static_lease *lease_struct, uint32_t ip) FAST_FUNC;
/* Print out static leases just to check what's going on (debug code) */
void printStaticLeases(struct static_lease **lease_struct) FAST_FUNC;
/*** serverpacket.h ***/
int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
/*** files.h ***/
void read_config(const char *file) FAST_FUNC;
void write_leases(void) FAST_FUNC;
void read_leases(const char *file) FAST_FUNC;
struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
POP_SAVED_FUNCTION_VISIBILITY
#endif
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