1 /* vi: set sw=4 ts=4: */
4 #define UDHCP_DHCPD_H 1
6 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
8 /* Defaults you may want to tweak */
9 /* Default max_lease_sec */
10 #define DEFAULT_LEASE_TIME (60*60*24 * 10)
11 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
12 /* Where to find the DHCP server configuration file */
13 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
18 struct option_set *next;
22 struct static_lease *next;
27 struct server_config_t {
28 char *interface; /* interface to use */
29 //TODO: ifindex, server_nip, server_mac
30 // are obtained from interface name.
31 // Instead of querying them *once*, create update_server_network_data_cache()
32 // and call it before any usage of these fields.
33 // update_server_network_data_cache() must re-query data
34 // if more than N seconds have passed after last use.
37 #if ENABLE_FEATURE_UDHCP_PORT
40 uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
41 struct option_set *options; /* list of DHCP options loaded from the config file */
43 /* start,end are in host order: we need to compare start <= ip <= end */
44 uint32_t start_ip; /* start address of leases, in host order */
45 uint32_t end_ip; /* end of leases, in host order */
46 uint32_t max_lease_sec; /* maximum lease time (host order) */
47 uint32_t min_lease_sec; /* minimum lease time a client can request */
48 uint32_t max_leases; /* maximum number of leases (including reserved addresses) */
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 siaddr_nip; /* "next server" bootp option */
58 char *notify_file; /* what to run whenever leases are written */
59 char *sname; /* bootp server name */
60 char *boot_file; /* bootp boot file option */
61 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
64 #define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
65 /* client_config sits in 2nd half of bb_common_bufsiz1 */
67 #if ENABLE_FEATURE_UDHCP_PORT
68 #define SERVER_PORT (server_config.port)
70 #define SERVER_PORT 67
76 typedef uint32_t leasetime_t;
77 typedef int32_t signed_leasetime_t;
80 /* "nip": IP in network order */
81 /* Unix time when lease expires. Kept in memory in host order.
82 * When written to file, converted to network order
83 * and adjusted (current time subtracted) */
86 /* We use lease_mac[6], since e.g. ARP probing uses
87 * only 6 first bytes anyway. We check received dhcp packets
88 * that their hlen == 6 and thus chaddr has only 6 significant bytes
89 * (dhcp packet has chaddr[16], not [6])
94 /* total size is a multiply of 4 */
97 extern struct dyn_lease *g_leases;
99 struct dyn_lease *add_lease(
100 const uint8_t *chaddr, uint32_t yiaddr,
101 leasetime_t leasetime,
102 const char *hostname, int hostname_len
104 int is_expired_lease(struct dyn_lease *lease) FAST_FUNC;
105 struct dyn_lease *find_lease_by_mac(const uint8_t *mac) FAST_FUNC;
106 struct dyn_lease *find_lease_by_nip(uint32_t nip) FAST_FUNC;
107 uint32_t find_free_or_expired_nip(const uint8_t *safe_mac) FAST_FUNC;
110 /*** static_leases.h ***/
112 /* Config file parser will pass static lease info to this function
113 * which will add it to a data structure that can be searched later */
114 void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
115 /* Find static lease IP by mac */
116 uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
117 /* Check to see if an IP is reserved as a static IP */
118 int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
119 /* Print out static leases just to check what's going on (debug code) */
120 #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
121 void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
123 # define log_static_leases(st_lease_pp) ((void)0)
129 void read_config(const char *file) FAST_FUNC;
130 void write_leases(void) FAST_FUNC;
131 void read_leases(const char *file) FAST_FUNC;
132 struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
135 POP_SAVED_FUNCTION_VISIBILITY