blob: b8f96b02988f6d8d545aa1a302953c434e44d2a6
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Licensed under GPLv2, see file LICENSE in this source tree. |
4 | */ |
5 | #ifndef UDHCP_DHCPD_H |
6 | #define UDHCP_DHCPD_H 1 |
7 | |
8 | PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN |
9 | |
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" |
16 | |
17 | |
18 | struct static_lease { |
19 | struct static_lease *next; |
20 | uint32_t nip; |
21 | uint8_t mac[6]; |
22 | }; |
23 | |
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. |
32 | int ifindex; |
33 | uint32_t server_nip; |
34 | #if ENABLE_FEATURE_UDHCP_PORT |
35 | uint16_t port; |
36 | #endif |
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 |
48 | * decline message */ |
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 */ |
52 | char *lease_file; |
53 | char *pidfile; |
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 */ |
58 | } FIX_ALIASING; |
59 | |
60 | #define server_config (*(struct server_config_t*)bb_common_bufsiz1) |
61 | /* client_config sits in 2nd half of bb_common_bufsiz1 */ |
62 | |
63 | #if ENABLE_FEATURE_UDHCP_PORT |
64 | #define SERVER_PORT (server_config.port) |
65 | #define SERVER_PORT6 (server_config.port) |
66 | #else |
67 | #define SERVER_PORT 67 |
68 | #define SERVER_PORT6 547 |
69 | #endif |
70 | |
71 | |
72 | typedef uint32_t leasetime_t; |
73 | typedef int32_t signed_leasetime_t; |
74 | |
75 | struct dyn_lease { |
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) */ |
79 | leasetime_t expires; |
80 | /* "nip": IP in network order */ |
81 | uint32_t lease_nip; |
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]) |
86 | */ |
87 | uint8_t lease_mac[6]; |
88 | char hostname[20]; |
89 | uint8_t pad[2]; |
90 | /* total size is a multiply of 4 */ |
91 | } PACKED; |
92 | |
93 | POP_SAVED_FUNCTION_VISIBILITY |
94 | |
95 | #endif |
96 |