137 lines
5.1 KiB
C
137 lines
5.1 KiB
C
/* vi: set sw=4 ts=4: */
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/* dhcpd.h */
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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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/************************************/
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/* Defaults _you_ may want to tweak */
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/************************************/
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/* the period of time the client is allowed to use that address */
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#define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
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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 option_set {
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uint8_t *data;
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struct option_set *next;
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};
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struct static_lease {
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struct static_lease *next;
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uint32_t ip;
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uint8_t mac[6];
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};
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struct server_config_t {
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uint32_t server; /* Our IP, in network order */
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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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/* 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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struct option_set *options; /* List of DHCP options loaded from the config file */
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char *interface; /* The name of the interface to use */
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int ifindex; /* Index number of the interface to use */
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uint8_t arp[6]; /* Our arp address */
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// disabled: dumpleases has no way of knowing this value,
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// and will break if it's off. Now it's on always.
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// char remaining; /* Should the lease time in lease file
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// * be written as lease time remaining, or
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// * as the absolute time the lease expires */
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uint32_t lease; /* lease time in seconds (host order) */
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uint32_t max_leases; /* maximum number of leases (including reserved address) */
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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 min_lease; /* minimum lease time a client can request */
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uint32_t siaddr; /* 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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};
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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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/*** leases.h ***/
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typedef uint32_t leasetime_t;
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typedef int32_t signed_leasetime_t;
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struct dhcpOfferedAddr {
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uint8_t lease_mac16[16];
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/* "nip": IP in network order */
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uint32_t lease_nip;
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/* Unix time when lease expires, regardless of value of
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* server_config.remaining. Kept in memory in host order.
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* When written to file, converted to network order
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* and optionally adjusted (current time subtracted)
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* if server_config.remaining = 1 */
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leasetime_t expires;
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uint8_t hostname[20]; /* (size is a multiply of 4) */
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};
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extern struct dhcpOfferedAddr *leases;
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struct dhcpOfferedAddr *add_lease(
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const uint8_t *chaddr, uint32_t yiaddr,
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leasetime_t leasetime, uint8_t *hostname
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) FAST_FUNC;
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int lease_expired(struct dhcpOfferedAddr *lease) FAST_FUNC;
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struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr) FAST_FUNC;
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struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) FAST_FUNC;
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uint32_t find_free_or_expired_address(const uint8_t *chaddr) FAST_FUNC;
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/*** static_leases.h ***/
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/* Config file will pass static lease info to this function which will add it
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* to a data structure that can be searched later */
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void addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip) FAST_FUNC;
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/* Check to see if a mac has an associated static lease */
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uint32_t getIpByMac(struct static_lease *lease_struct, 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 reservedIp(struct static_lease *lease_struct, uint32_t ip) FAST_FUNC;
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/* Print out static leases just to check what's going on (debug code) */
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void printStaticLeases(struct static_lease **lease_struct) FAST_FUNC;
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/*** serverpacket.h ***/
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int send_offer(struct dhcpMessage *oldpacket) FAST_FUNC;
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int send_NAK(struct dhcpMessage *oldpacket) FAST_FUNC;
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int send_ACK(struct dhcpMessage *oldpacket, uint32_t yiaddr) FAST_FUNC;
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int send_inform(struct dhcpMessage *oldpacket) FAST_FUNC;
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/*** files.h ***/
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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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struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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