1/* vi: set sw=4 ts=4: */
2/* dhcpd.h */
3#ifndef _DHCPD_H
4#define _DHCPD_H
5
6/************************************/
7/* Defaults _you_ may want to tweak */
8/************************************/
9
10/* the period of time the client is allowed to use that address */
11#define LEASE_TIME              (60*60*24*10) /* 10 days of seconds */
12#define LEASES_FILE		"/var/lib/misc/udhcpd.leases"
13
14/* where to find the DHCP server configuration file */
15#define DHCPD_CONF_FILE         "/etc/udhcpd.conf"
16
17struct option_set {
18	uint8_t *data;
19	struct option_set *next;
20};
21
22struct static_lease {
23	struct static_lease *next;
24	uint8_t *mac;
25	uint32_t *ip;
26};
27
28struct server_config_t {
29	uint32_t server;                /* Our IP, in network order */
30	/* start,end are in host order: we need to compare start <= ip <= end */
31	uint32_t start_ip;              /* Start address of leases, in host order */
32	uint32_t end_ip;                /* End of leases, in host order */
33	struct option_set *options;     /* List of DHCP options loaded from the config file */
34	char *interface;                /* The name of the interface to use */
35	int ifindex;                    /* Index number of the interface to use */
36	uint8_t arp[6];                 /* Our arp address */
37	char remaining;                 /* should the lease file be interpreted as lease time remaining, or
38	                                 * as the time the lease expires */
39	uint32_t lease;	                /* lease time in seconds (host order) */
40	uint32_t max_leases;            /* maximum number of leases (including reserved address) */
41	uint32_t auto_time;             /* how long should udhcpd wait before writing a config file.
42	                                 * if this is zero, it will only write one on SIGUSR1 */
43	uint32_t decline_time;          /* how long an address is reserved if a client returns a
44	                                 * decline message */
45	uint32_t conflict_time;         /* how long an arp conflict offender is leased for */
46	uint32_t offer_time;            /* how long an offered address is reserved */
47	uint32_t min_lease;             /* minimum lease a client can request */
48	char *lease_file;
49	char *pidfile;
50	char *notify_file;              /* What to run whenever leases are written */
51	uint32_t siaddr;                /* next server bootp option */
52	char *sname;                    /* bootp server name */
53	char *boot_file;                /* bootp boot file option */
54	struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
55};
56
57extern struct server_config_t server_config;
58extern struct dhcpOfferedAddr *leases;
59
60
61/*** leases.h ***/
62
63struct dhcpOfferedAddr {
64	uint8_t chaddr[16];
65	uint32_t yiaddr;	/* network order */
66	uint32_t expires;	/* host order */
67};
68
69struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
70int lease_expired(struct dhcpOfferedAddr *lease);
71struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
72struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
73uint32_t find_address(int check_expired);
74
75
76/*** static_leases.h ***/
77
78/* Config file will pass static lease info to this function which will add it
79 * to a data structure that can be searched later */
80int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
81/* Check to see if a mac has an associated static lease */
82uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
83/* Check to see if an ip is reserved as a static ip */
84uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
85/* Print out static leases just to check what's going on (debug code) */
86void printStaticLeases(struct static_lease **lease_struct);
87
88
89/*** serverpacket.h ***/
90
91int sendOffer(struct dhcpMessage *oldpacket);
92int sendNAK(struct dhcpMessage *oldpacket);
93int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
94int send_inform(struct dhcpMessage *oldpacket);
95
96
97/*** files.h ***/
98
99int read_config(const char *file);
100void write_leases(void);
101void read_leases(const char *file);
102struct option_set *find_option(struct option_set *opt_list, char code);
103
104
105#endif
106