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)
66 #define SERVER_PORT 67
70 typedef uint32_t leasetime_t
;
71 typedef int32_t signed_leasetime_t
;
74 /* Unix time when lease expires. Kept in memory in host order.
75 * When written to file, converted to network order
76 * and adjusted (current time subtracted) */
78 /* "nip": IP in network order */
80 /* We use lease_mac[6], since e.g. ARP probing uses
81 * only 6 first bytes anyway. We check received dhcp packets
82 * that their hlen == 6 and thus chaddr has only 6 significant bytes
83 * (dhcp packet has chaddr[16], not [6])
88 /* total size is a multiply of 4 */
91 extern struct dyn_lease
*g_leases
;
93 struct dyn_lease
*add_lease(
94 const uint8_t *chaddr
, uint32_t yiaddr
,
95 leasetime_t leasetime
,
96 const char *hostname
, int hostname_len
98 int is_expired_lease(struct dyn_lease
*lease
) FAST_FUNC
;
99 struct dyn_lease
*find_lease_by_mac(const uint8_t *mac
) FAST_FUNC
;
100 struct dyn_lease
*find_lease_by_nip(uint32_t nip
) FAST_FUNC
;
101 uint32_t find_free_or_expired_nip(const uint8_t *safe_mac
) FAST_FUNC
;
104 /* Config file parser will pass static lease info to this function
105 * which will add it to a data structure that can be searched later */
106 void add_static_lease(struct static_lease
**st_lease_pp
, uint8_t *mac
, uint32_t nip
) FAST_FUNC
;
107 /* Find static lease IP by mac */
108 uint32_t get_static_nip_by_mac(struct static_lease
*st_lease
, void *arg
) FAST_FUNC
;
109 /* Check to see if an IP is reserved as a static IP */
110 int is_nip_reserved(struct static_lease
*st_lease
, uint32_t nip
) FAST_FUNC
;
111 /* Print out static leases just to check what's going on (debug code) */
112 #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
113 void log_static_leases(struct static_lease
**st_lease_pp
) FAST_FUNC
;
115 # define log_static_leases(st_lease_pp) ((void)0)
119 void read_config(const char *file
) FAST_FUNC
;
120 void write_leases(void) FAST_FUNC
;
121 void read_leases(const char *file
) FAST_FUNC
;
124 POP_SAVED_FUNCTION_VISIBILITY