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 char *interface; /* interface to use */
32 //TODO: ifindex, server_nip, server_mac
33 // are obtained from interface name.
34 // Instead of querying them *once*, create update_server_network_data_cache()
35 // and call it before any usage of these fields.
36 // update_server_network_data_cache() must re-query data
37 // if more than N seconds have passed after last use.
40 #if ENABLE_FEATURE_UDHCP_PORT
43 uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
44 struct option_set *options; /* list of DHCP options loaded from the config file */
45 /* start,end are in host order: we need to compare start <= ip <= end */
46 uint32_t start_ip; /* start address of leases, in host order */
47 uint32_t end_ip; /* end of leases, in host order */
48 uint32_t lease; /* lease time in seconds (host order) */
49 uint32_t max_leases; /* maximum number of leases (including reserved address) */
50 uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
51 * if this is zero, it will only write one on SIGUSR1 */
52 uint32_t decline_time; /* how long an address is reserved if a client returns a
54 uint32_t conflict_time; /* how long an arp conflict offender is leased for */
55 uint32_t offer_time; /* how long an offered address is reserved */
56 uint32_t min_lease; /* minimum lease time a client can request */
57 uint32_t siaddr_nip; /* "next server" bootp option */
60 char *notify_file; /* what to run whenever leases are written */
61 char *sname; /* bootp server name */
62 char *boot_file; /* bootp boot file option */
63 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
66 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
67 /* client_config sits in 2nd half of bb_common_bufsiz1 */
69 #if ENABLE_FEATURE_UDHCP_PORT
70 #define SERVER_PORT (server_config.port)
72 #define SERVER_PORT 67
78 typedef uint32_t leasetime_t;
79 typedef int32_t signed_leasetime_t;
81 struct dhcpOfferedAddr {
82 uint8_t lease_mac16[16];
83 /* "nip": IP in network order */
85 /* Unix time when lease expires. Kept in memory in host order.
86 * When written to file, converted to network order
87 * and adjusted (current time subtracted) */
89 uint8_t hostname[20]; /* (size is a multiply of 4) */
92 extern struct dhcpOfferedAddr *leases;
94 struct dhcpOfferedAddr *add_lease(
95 const uint8_t *chaddr, uint32_t yiaddr,
96 leasetime_t leasetime, uint8_t *hostname
98 int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
99 struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
100 struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
101 uint32_t find_free_or_expired_address(const uint8_t *chaddr) FAST_FUNC;
104 /*** static_leases.h ***/
106 /* Config file parser will pass static lease info to this function
107 * which will add it to a data structure that can be searched later */
108 void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
109 /* Find static lease IP by mac */
110 uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
111 /* Check to see if an IP is reserved as a static IP */
112 int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
113 /* Print out static leases just to check what's going on (debug code) */
114 void print_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
117 /*** serverpacket.h ***/
119 int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
120 int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
121 int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
122 int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
127 void read_config(const char *file) FAST_FUNC;
128 void write_leases(void) FAST_FUNC;
129 void read_leases(const char *file) FAST_FUNC;
130 struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
133 POP_SAVED_FUNCTION_VISIBILITY