1 /* vi: set sw=4 ts=4: */
8 # pragma GCC visibility push(hidden)
11 /************************************/
12 /* Defaults _you_ may want to tweak */
13 /************************************/
15 /* the period of time the client is allowed to use that address */
16 #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
17 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
19 /* where to find the DHCP server configuration file */
20 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
24 struct option_set *next;
28 struct static_lease *next;
33 struct server_config_t {
34 uint32_t server; /* Our IP, in network order */
35 #if ENABLE_FEATURE_UDHCP_PORT
38 /* start,end are in host order: we need to compare start <= ip <= end */
39 uint32_t start_ip; /* Start address of leases, in host order */
40 uint32_t end_ip; /* End of leases, in host order */
41 struct option_set *options; /* List of DHCP options loaded from the config file */
42 char *interface; /* The name of the interface to use */
43 int ifindex; /* Index number of the interface to use */
44 uint8_t arp[6]; /* Our arp address */
45 // disabled: dumpleases has no way of knowing this value,
46 // and will break if it's off. Now it's on always.
47 // char remaining; /* Should the lease time in lease file
48 // * be written as lease time remaining, or
49 // * as the absolute time the lease expires */
50 uint32_t lease; /* lease time in seconds (host order) */
51 uint32_t max_leases; /* maximum number of leases (including reserved address) */
52 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
53 * if this is zero, it will only write one on SIGUSR1 */
54 uint32_t decline_time; /* how long an address is reserved if a client returns a
56 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
57 uint32_t offer_time; /* how long an offered address is reserved */
58 uint32_t min_lease; /* minimum lease time a client can request */
59 uint32_t siaddr; /* next server bootp option */
62 char *notify_file; /* What to run whenever leases are written */
63 char *sname; /* bootp server name */
64 char *boot_file; /* bootp boot file option */
65 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
68 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
69 /* client_config sits in 2nd half of bb_common_bufsiz1 */
71 #if ENABLE_FEATURE_UDHCP_PORT
72 #define SERVER_PORT (server_config.port)
74 #define SERVER_PORT 67
80 typedef uint32_t leasetime_t;
81 typedef int32_t signed_leasetime_t;
83 struct dhcpOfferedAddr {
85 /* In network order */
87 /* Unix time when lease expires, regardless of value of
88 * server_config.remaining. Kept in memory in host order.
89 * When written to file, converted to network order
90 * and optionally adjusted (current time subtracted)
91 * if server_config.remaining = 1 */
93 uint8_t hostname[20]; /* (size is a multiply of 4) */
96 extern struct dhcpOfferedAddr *leases;
98 struct dhcpOfferedAddr *add_lease(
99 const uint8_t *chaddr, uint32_t yiaddr,
100 leasetime_t leasetime, uint8_t *hostname
102 int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
103 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
104 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
105 uint32_t find_free_or_expired_address(void) FAST_FUNC;
108 /*** static_leases.h ***/
110 /* Config file will pass static lease info to this function which will add it
111 * to a data structure that can be searched later */
112 void addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip) FAST_FUNC;
113 /* Check to see if a mac has an associated static lease */
114 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg) FAST_FUNC;
115 /* Check to see if an ip is reserved as a static ip */
116 int reservedIp(struct static_lease *lease_struct, uint32_t ip) FAST_FUNC;
117 /* Print out static leases just to check what's going on (debug code) */
118 void printStaticLeases(struct static_lease **lease_struct) FAST_FUNC;
121 /*** serverpacket.h ***/
123 int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
124 int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
125 int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
126 int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
131 void read_config(const char *file) FAST_FUNC;
132 void write_leases(void) FAST_FUNC;
133 void read_leases(const char *file) FAST_FUNC;
134 struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
137 #if __GNUC_PREREQ(4,1)
138 # pragma GCC visibility pop