1 /* vi: set sw=4 ts=4: */
4 #define UDHCP_DHCPD_H 1
6 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
8 /************************************/
9 /* Defaults _you_ may want to tweak */
10 /************************************/
12 /* the period of time the client is allowed to use that address */
13 #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
14 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
16 /* where to find the DHCP server configuration file */
17 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
21 struct option_set *next;
25 struct static_lease *next;
30 struct server_config_t {
31 uint32_t server; /* Our IP, in network order */
32 #if ENABLE_FEATURE_UDHCP_PORT
35 /* start,end are in host order: we need to compare start <= ip <= end */
36 uint32_t start_ip; /* Start address of leases, in host order */
37 uint32_t end_ip; /* End of leases, in host order */
38 struct option_set *options; /* List of DHCP options loaded from the config file */
39 char *interface; /* The name of the interface to use */
40 int ifindex; /* Index number of the interface to use */
41 uint8_t arp[6]; /* Our arp address */
42 // disabled: dumpleases has no way of knowing this value,
43 // and will break if it's off. Now it's on always.
44 // char remaining; /* Should the lease time in lease file
45 // * be written as lease time remaining, or
46 // * as the absolute time the lease expires */
47 uint32_t lease; /* lease time in seconds (host order) */
48 uint32_t max_leases; /* maximum number of leases (including reserved address) */
49 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
50 * if this is zero, it will only write one on SIGUSR1 */
51 uint32_t decline_time; /* how long an address is reserved if a client returns a
53 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
54 uint32_t offer_time; /* how long an offered address is reserved */
55 uint32_t min_lease; /* minimum lease time a client can request */
56 uint32_t siaddr; /* next server bootp option */
59 char *notify_file; /* What to run whenever leases are written */
60 char *sname; /* bootp server name */
61 char *boot_file; /* bootp boot file option */
62 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
65 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
66 /* client_config sits in 2nd half of bb_common_bufsiz1 */
68 #if ENABLE_FEATURE_UDHCP_PORT
69 #define SERVER_PORT (server_config.port)
71 #define SERVER_PORT 67
77 typedef uint32_t leasetime_t;
78 typedef int32_t signed_leasetime_t;
80 struct dhcpOfferedAddr {
82 /* In network order */
84 /* Unix time when lease expires, regardless of value of
85 * server_config.remaining. Kept in memory in host order.
86 * When written to file, converted to network order
87 * and optionally adjusted (current time subtracted)
88 * if server_config.remaining = 1 */
90 uint8_t hostname[20]; /* (size is a multiply of 4) */
93 extern struct dhcpOfferedAddr *leases;
95 struct dhcpOfferedAddr *add_lease(
96 const uint8_t *chaddr, uint32_t yiaddr,
97 leasetime_t leasetime, uint8_t *hostname
99 int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
100 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
101 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
102 uint32_t find_free_or_expired_address(const uint8_t *chaddr) FAST_FUNC;
105 /*** static_leases.h ***/
107 /* Config file will pass static lease info to this function which will add it
108 * to a data structure that can be searched later */
109 void addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip) FAST_FUNC;
110 /* Check to see if a mac has an associated static lease */
111 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg) FAST_FUNC;
112 /* Check to see if an ip is reserved as a static ip */
113 int reservedIp(struct static_lease *lease_struct, uint32_t ip) FAST_FUNC;
114 /* Print out static leases just to check what's going on (debug code) */
115 void printStaticLeases(struct static_lease **lease_struct) FAST_FUNC;
118 /*** serverpacket.h ***/
120 int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
121 int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
122 int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
123 int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
128 void read_config(const char *file) FAST_FUNC;
129 void write_leases(void) FAST_FUNC;
130 void read_leases(const char *file) FAST_FUNC;
131 struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
134 POP_SAVED_FUNCTION_VISIBILITY