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 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
59 extern struct dhcpOfferedAddr *leases;
64 struct dhcpOfferedAddr {
66 uint32_t yiaddr; /* network order */
67 uint32_t expires; /* host order */
70 struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
71 int lease_expired(struct dhcpOfferedAddr *lease);
72 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
73 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
74 uint32_t find_address(int check_expired);
77 /*** static_leases.h ***/
79 /* Config file will pass static lease info to this function which will add it
80 * to a data structure that can be searched later */
81 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
82 /* Check to see if a mac has an associated static lease */
83 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
84 /* Check to see if an ip is reserved as a static ip */
85 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
86 /* Print out static leases just to check what's going on (debug code) */
87 void printStaticLeases(struct static_lease **lease_struct);
90 /*** serverpacket.h ***/
92 int sendOffer(struct dhcpMessage *oldpacket);
93 int sendNAK(struct dhcpMessage *oldpacket);
94 int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
95 int send_inform(struct dhcpMessage *oldpacket);
100 int read_config(const char *file);
101 void write_leases(void);
102 void read_leases(const char *file);
103 struct option_set *find_option(struct option_set *opt_list, uint8_t code);