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"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Denys Vlasenko385b4562010-03-26 10:09:34 +01002/*
3 * Licensed under GPLv2, see file LICENSE in this tarball for details.
4 */
Denis Vlasenkof81e8db2009-04-09 12:35:13 +00005#ifndef UDHCP_DHCPD_H
6#define UDHCP_DHCPD_H 1
Denis Vlasenkod55fe3e2008-02-04 13:12:16 +00007
Denis Vlasenkof81e8db2009-04-09 12:35:13 +00008PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
Denis Vlasenko98636eb2008-05-09 17:59:34 +00009
Denys Vlasenko799d00e2009-06-17 13:44:04 +020010/* Defaults you may want to tweak */
11/* Default max_lease_sec */
Denys Vlasenko2e7aa922010-03-21 02:22:07 +010012#define DEFAULT_LEASE_TIME (60*60*24 * 10)
13#define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
Denys Vlasenko799d00e2009-06-17 13:44:04 +020014/* Where to find the DHCP server configuration file */
Mike Frysinger7031f622006-05-08 03:20:50 +000015#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
16
Denys Vlasenko799d00e2009-06-17 13:44:04 +020017
Mike Frysinger7031f622006-05-08 03:20:50 +000018struct static_lease {
Denis Vlasenko42b3dea2007-07-03 15:47:50 +000019 struct static_lease *next;
Denys Vlasenkocab3a012009-06-16 12:03:12 +020020 uint32_t nip;
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000021 uint8_t mac[6];
Mike Frysinger7031f622006-05-08 03:20:50 +000022};
23
24struct server_config_t {
Denys Vlasenko26918dd2009-06-16 12:04:23 +020025 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;
Denis Vlasenkob386c1c2008-02-04 13:23:53 +000034#if ENABLE_FEATURE_UDHCP_PORT
Denis Vlasenkod55fe3e2008-02-04 13:12:16 +000035 uint16_t port;
Denis Vlasenkob386c1c2008-02-04 13:23:53 +000036#endif
Denys Vlasenko26918dd2009-06-16 12:04:23 +020037 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 */
Denis Vlasenkoc82b5102007-07-01 17:05:57 +000039 /* start,end are in host order: we need to compare start <= ip <= end */
Denys Vlasenko26918dd2009-06-16 12:04:23 +020040 uint32_t start_ip; /* start address of leases, in host order */
41 uint32_t end_ip; /* end of leases, in host order */
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020042 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) */
Denis Vlasenko42b3dea2007-07-03 15:47:50 +000045 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 */
Denys Vlasenko26918dd2009-06-16 12:04:23 +020051 uint32_t siaddr_nip; /* "next server" bootp option */
Mike Frysinger7031f622006-05-08 03:20:50 +000052 char *lease_file;
53 char *pidfile;
Denys Vlasenko26918dd2009-06-16 12:04:23 +020054 char *notify_file; /* what to run whenever leases are written */
Denis Vlasenko42b3dea2007-07-03 15:47:50 +000055 char *sname; /* bootp server name */
56 char *boot_file; /* bootp boot file option */
Mike Frysinger7031f622006-05-08 03:20:50 +000057 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
Denys Vlasenko2f142632010-02-05 15:35:05 +010058} FIX_ALIASING;
Mike Frysinger7031f622006-05-08 03:20:50 +000059
Denis Vlasenkodeabacd2007-09-30 17:55:43 +000060#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
Denis Vlasenkod55fe3e2008-02-04 13:12:16 +000061/* 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#else
66#define SERVER_PORT 67
67#endif
Denis Vlasenkodeabacd2007-09-30 17:55:43 +000068
Mike Frysinger7031f622006-05-08 03:20:50 +000069
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000070typedef uint32_t leasetime_t;
71typedef int32_t signed_leasetime_t;
72
Denys Vlasenko31af3d52009-06-17 11:57:09 +020073struct dyn_lease {
Denys Vlasenko56f2d062009-06-16 10:25:35 +020074 /* Unix time when lease expires. Kept in memory in host order.
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000075 * When written to file, converted to network order
Denys Vlasenko56f2d062009-06-16 10:25:35 +020076 * and adjusted (current time subtracted) */
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000077 leasetime_t expires;
Denys Vlasenkoc8a2ab12010-03-28 00:02:20 +010078 /* "nip": IP in network order */
Denys Vlasenko31af3d52009-06-17 11:57:09 +020079 uint32_t lease_nip;
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
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020083 * (dhcp packet has chaddr[16], not [6])
Denys Vlasenko31af3d52009-06-17 11:57:09 +020084 */
85 uint8_t lease_mac[6];
Denys Vlasenko95cc8142009-07-07 14:59:30 +020086 char hostname[20];
Denys Vlasenko31af3d52009-06-17 11:57:09 +020087 uint8_t pad[2];
88 /* total size is a multiply of 4 */
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020089} PACKED;
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000090
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020091extern struct dyn_lease *g_leases;
Denis Vlasenkobd79c3d2009-04-01 12:36:09 +000092
Denys Vlasenko31af3d52009-06-17 11:57:09 +020093struct dyn_lease *add_lease(
Denis Vlasenkobd79c3d2009-04-01 12:36:09 +000094 const uint8_t *chaddr, uint32_t yiaddr,
Denys Vlasenko95cc8142009-07-07 14:59:30 +020095 leasetime_t leasetime,
96 const char *hostname, int hostname_len
Denis Vlasenkobd79c3d2009-04-01 12:36:09 +000097 ) FAST_FUNC;
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020098int is_expired_lease(struct dyn_lease *lease) FAST_FUNC;
99struct dyn_lease *find_lease_by_mac(const uint8_t *mac) FAST_FUNC;
100struct dyn_lease *find_lease_by_nip(uint32_t nip) FAST_FUNC;
101uint32_t find_free_or_expired_nip(const uint8_t *safe_mac) FAST_FUNC;
Denis Vlasenko5a3395b2006-11-18 19:51:32 +0000102
103
Denys Vlasenkocab3a012009-06-16 12:03:12 +0200104/* 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 */
106void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
107/* Find static lease IP by mac */
108uint32_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 */
110int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
Denis Vlasenko5a3395b2006-11-18 19:51:32 +0000111/* Print out static leases just to check what's going on (debug code) */
Denys Vlasenko799d00e2009-06-17 13:44:04 +0200112#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
113void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
114#else
115# define log_static_leases(st_lease_pp) ((void)0)
116#endif
Denis Vlasenko5a3395b2006-11-18 19:51:32 +0000117
118
Denis Vlasenkof1980f62008-09-26 09:34:59 +0000119void read_config(const char *file) FAST_FUNC;
120void write_leases(void) FAST_FUNC;
121void read_leases(const char *file) FAST_FUNC;
Denis Vlasenko5a3395b2006-11-18 19:51:32 +0000122
123
Denis Vlasenkof81e8db2009-04-09 12:35:13 +0000124POP_SAVED_FUNCTION_VISIBILITY
Denis Vlasenko98636eb2008-05-09 17:59:34 +0000125
Mike Frysinger7031f622006-05-08 03:20:50 +0000126#endif