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127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#ifndef UDHCP_DHCPD_H
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#define UDHCP_DHCPD_H 1
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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/* Defaults you may want to tweak */
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/* Default max_lease_sec */
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#define DEFAULT_LEASE_TIME (60*60*24 * 10)
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#define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
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/* Where to find the DHCP server configuration file */
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#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
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struct static_lease {
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struct static_lease *next;
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uint32_t nip;
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uint8_t mac[6];
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};
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struct server_config_t {
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char *interface; /* interface to use */
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//TODO: ifindex, server_nip, server_mac
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// are obtained from interface name.
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// Instead of querying them *once*, create update_server_network_data_cache()
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// and call it before any usage of these fields.
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// update_server_network_data_cache() must re-query data
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// if more than N seconds have passed after last use.
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int ifindex;
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uint32_t server_nip;
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#if ENABLE_FEATURE_UDHCP_PORT
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uint16_t port;
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#endif
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uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
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struct option_set *options; /* list of DHCP options loaded from the config file */
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/* start,end are in host order: we need to compare start <= ip <= end */
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uint32_t start_ip; /* start address of leases, in host order */
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uint32_t end_ip; /* end of leases, in host order */
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uint32_t max_lease_sec; /* maximum lease time (host order) */
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uint32_t min_lease_sec; /* minimum lease time a client can request */
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uint32_t max_leases; /* maximum number of leases (including reserved addresses) */
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uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
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* if this is zero, it will only write one on SIGUSR1 */
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uint32_t decline_time; /* how long an address is reserved if a client returns a
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* decline message */
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uint32_t conflict_time; /* how long an arp conflict offender is leased for */
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uint32_t offer_time; /* how long an offered address is reserved */
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uint32_t siaddr_nip; /* "next server" bootp option */
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char *lease_file;
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char *pidfile;
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char *notify_file; /* what to run whenever leases are written */
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char *sname; /* bootp server name */
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char *boot_file; /* bootp boot file option */
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struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
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} FIX_ALIASING;
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#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
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/* client_config sits in 2nd half of bb_common_bufsiz1 */
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#if ENABLE_FEATURE_UDHCP_PORT
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#define SERVER_PORT (server_config.port)
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#else
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#define SERVER_PORT 67
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#endif
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typedef uint32_t leasetime_t;
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typedef int32_t signed_leasetime_t;
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struct dyn_lease {
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/* Unix time when lease expires. Kept in memory in host order.
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* When written to file, converted to network order
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* and adjusted (current time subtracted) */
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leasetime_t expires;
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/* "nip": IP in network order */
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uint32_t lease_nip;
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/* We use lease_mac[6], since e.g. ARP probing uses
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* only 6 first bytes anyway. We check received dhcp packets
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* that their hlen == 6 and thus chaddr has only 6 significant bytes
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* (dhcp packet has chaddr[16], not [6])
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*/
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uint8_t lease_mac[6];
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char hostname[20];
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uint8_t pad[2];
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/* total size is a multiply of 4 */
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} PACKED;
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extern struct dyn_lease *g_leases;
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struct dyn_lease *add_lease(
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const uint8_t *chaddr, uint32_t yiaddr,
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leasetime_t leasetime,
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const char *hostname, int hostname_len
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) FAST_FUNC;
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int is_expired_lease(struct dyn_lease *lease) FAST_FUNC;
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struct dyn_lease *find_lease_by_mac(const uint8_t *mac) FAST_FUNC;
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struct dyn_lease *find_lease_by_nip(uint32_t nip) FAST_FUNC;
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uint32_t find_free_or_expired_nip(const uint8_t *safe_mac) FAST_FUNC;
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/* Config file parser will pass static lease info to this function
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* which will add it to a data structure that can be searched later */
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void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
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/* Find static lease IP by mac */
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uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
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/* Check to see if an IP is reserved as a static IP */
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int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
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/* Print out static leases just to check what's going on (debug code) */
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
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void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
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#else
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# define log_static_leases(st_lease_pp) ((void)0)
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#endif
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void read_config(const char *file) FAST_FUNC;
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void write_leases(void) FAST_FUNC;
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void read_leases(const char *file) FAST_FUNC;
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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