1 /* vi: set sw=4 ts=4: */
7 /************************************/
8 /* Defaults _you_ may want to tweak */
9 /************************************/
11 /* the period of time the client is allowed to use that address */
12 #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
13 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
15 /* where to find the DHCP server configuration file */
16 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
20 struct option_set *next;
24 struct static_lease *next;
29 struct server_config_t {
30 uint32_t server; /* Our IP, in network order */
31 #if ENABLE_FEATURE_UDHCP_PORT
34 /* start,end are in host order: we need to compare start <= ip <= end */
35 uint32_t start_ip; /* Start address of leases, in host order */
36 uint32_t end_ip; /* End of leases, in host order */
37 struct option_set *options; /* List of DHCP options loaded from the config file */
38 char *interface; /* The name of the interface to use */
39 int ifindex; /* Index number of the interface to use */
40 uint8_t arp[6]; /* Our arp address */
41 char remaining; /* should the lease file be interpreted as lease time remaining, or
42 * as the time the lease expires */
43 uint32_t lease; /* lease time in seconds (host order) */
44 uint32_t max_leases; /* maximum number of leases (including reserved address) */
45 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
46 * if this is zero, it will only write one on SIGUSR1 */
47 uint32_t decline_time; /* how long an address is reserved if a client returns a
49 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
50 uint32_t offer_time; /* how long an offered address is reserved */
51 uint32_t min_lease; /* minimum lease a client can request */
54 char *notify_file; /* What to run whenever leases are written */
55 uint32_t siaddr; /* next server bootp option */
56 char *sname; /* bootp server name */
57 char *boot_file; /* bootp boot file option */
58 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
61 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
62 /* client_config sits in 2nd half of bb_common_bufsiz1 */
64 #if ENABLE_FEATURE_UDHCP_PORT
65 #define SERVER_PORT (server_config.port)
67 #define SERVER_PORT 67
70 extern struct dhcpOfferedAddr *leases;
75 struct dhcpOfferedAddr {
77 uint32_t yiaddr; /* network order */
78 uint32_t expires; /* host order */
81 struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
82 int lease_expired(struct dhcpOfferedAddr *lease);
83 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
84 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
85 uint32_t find_address(int check_expired);
88 /*** static_leases.h ***/
90 /* Config file will pass static lease info to this function which will add it
91 * to a data structure that can be searched later */
92 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
93 /* Check to see if a mac has an associated static lease */
94 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
95 /* Check to see if an ip is reserved as a static ip */
96 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
97 /* Print out static leases just to check what's going on (debug code) */
98 void printStaticLeases(struct static_lease **lease_struct);
101 /*** serverpacket.h ***/
103 int sendOffer(struct dhcpMessage *oldpacket);
104 int sendNAK(struct dhcpMessage *oldpacket);
105 int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
106 int send_inform(struct dhcpMessage *oldpacket);
111 void read_config(const char *file);
112 void write_leases(void);
113 void read_leases(const char *file);
114 struct option_set *find_option(struct option_set *opt_list, uint8_t code);