1 /* vi: set sw=4 ts=4: */
6 /************************************/
7 /* Defaults _you_ may want to tweak */
8 /************************************/
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"
14 /* where to find the DHCP server configuration file */
15 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
19 struct option_set *next;
23 struct static_lease *next;
28 struct 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
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 */
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 */
57 extern struct server_config_t server_config;
58 extern struct dhcpOfferedAddr *leases;
63 struct dhcpOfferedAddr {
65 uint32_t yiaddr; /* network order */
66 uint32_t expires; /* host order */
69 struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
70 int lease_expired(struct dhcpOfferedAddr *lease);
71 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
72 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
73 uint32_t find_address(int check_expired);
76 /*** static_leases.h ***/
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 */
80 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
81 /* Check to see if a mac has an associated static lease */
82 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
83 /* Check to see if an ip is reserved as a static ip */
84 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
85 /* Print out static leases just to check what's going on (debug code) */
86 void printStaticLeases(struct static_lease **lease_struct);
89 /*** serverpacket.h ***/
91 int sendOffer(struct dhcpMessage *oldpacket);
92 int sendNAK(struct dhcpMessage *oldpacket);
93 int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
94 int send_inform(struct dhcpMessage *oldpacket);
99 int read_config(const char *file);
100 void write_leases(void);
101 void read_leases(const char *file);
102 struct option_set *find_option(struct option_set *opt_list, char code);