1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2, see file LICENSE in this source tree.
6 #define UDHCP_DHCPD_H 1
8 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
10 /* Defaults you may want to tweak */
11 /* Default max_lease_sec */
12 #define DEFAULT_LEASE_TIME (60*60*24 * 10)
13 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
14 /* Where to find the DHCP server configuration file */
15 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
19 struct static_lease *next;
24 struct server_config_t {
25 char *interface; /* interface to use */
26 //TODO: ifindex, server_nip, server_mac
27 // are obtained from interface name.
28 // Instead of querying them *once*, create update_server_network_data_cache()
29 // and call it before any usage of these fields.
30 // update_server_network_data_cache() must re-query data
31 // if more than N seconds have passed after last use.
34 #if ENABLE_FEATURE_UDHCP_PORT
37 uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
38 struct option_set *options; /* list of DHCP options loaded from the config file */
39 /* start,end are in host order: we need to compare start <= ip <= end */
40 uint32_t start_ip; /* start address of leases, in host order */
41 uint32_t end_ip; /* end of leases, in host order */
42 uint32_t max_lease_sec; /* maximum lease time (host order) */
43 uint32_t min_lease_sec; /* minimum lease time a client can request */
44 uint32_t max_leases; /* maximum number of leases (including reserved addresses) */
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 siaddr_nip; /* "next server" bootp option */
54 char *notify_file; /* what to run whenever leases are written */
55 char *sname; /* bootp server name */
56 char *boot_file; /* bootp boot file option */
57 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
60 #define server_config (*(struct server_config_t*)bb_common_bufsiz1)
61 /* client_config sits in 2nd half of bb_common_bufsiz1 */
63 #if ENABLE_FEATURE_UDHCP_PORT
64 #define SERVER_PORT (server_config.port)
65 #define SERVER_PORT6 (server_config.port)
67 #define SERVER_PORT 67
68 #define SERVER_PORT6 547
72 typedef uint32_t leasetime_t;
73 typedef int32_t signed_leasetime_t;
76 /* Unix time when lease expires. Kept in memory in host order.
77 * When written to file, converted to network order
78 * and adjusted (current time subtracted) */
80 /* "nip": IP in network order */
82 /* We use lease_mac[6], since e.g. ARP probing uses
83 * only 6 first bytes anyway. We check received dhcp packets
84 * that their hlen == 6 and thus chaddr has only 6 significant bytes
85 * (dhcp packet has chaddr[16], not [6])
90 /* total size is a multiply of 4 */
93 POP_SAVED_FUNCTION_VISIBILITY