1/* vi: set sw=4 ts=4: */ 2/* dhcpd.h */ 3#ifndef _DHCPD_H 4#define _DHCPD_H 5 6/************************************/ 7/* Defaults _you_ may want to tweak */ 8/************************************/ 9 10/* the period of time the client is allowed to use that address */ 11#define LEASE_TIME (60*60*24*10) /* 10 days of seconds */ 12#define LEASES_FILE "/var/lib/misc/udhcpd.leases" 13 14/* where to find the DHCP server configuration file */ 15#define DHCPD_CONF_FILE "/etc/udhcpd.conf" 16 17struct option_set { 18 uint8_t *data; 19 struct option_set *next; 20}; 21 22struct static_lease { 23 struct static_lease *next; 24 uint8_t *mac; 25 uint32_t *ip; 26}; 27 28struct server_config_t { 29 uint32_t server; /* Our IP, in network order */ 30 /* start,end are in host order: we need to compare start <= ip <= end */ 31 uint32_t start_ip; /* Start address of leases, in host order */ 32 uint32_t end_ip; /* End of leases, in host order */ 33 struct option_set *options; /* List of DHCP options loaded from the config file */ 34 char *interface; /* The name of the interface to use */ 35 int ifindex; /* Index number of the interface to use */ 36 uint8_t arp[6]; /* Our arp address */ 37 char remaining; /* should the lease file be interpreted as lease time remaining, or 38 * as the time the lease expires */ 39 uint32_t lease; /* lease time in seconds (host order) */ 40 uint32_t max_leases; /* maximum number of leases (including reserved address) */ 41 uint32_t auto_time; /* how long should udhcpd wait before writing a config file. 42 * if this is zero, it will only write one on SIGUSR1 */ 43 uint32_t decline_time; /* how long an address is reserved if a client returns a 44 * decline message */ 45 uint32_t conflict_time; /* how long an arp conflict offender is leased for */ 46 uint32_t offer_time; /* how long an offered address is reserved */ 47 uint32_t min_lease; /* minimum lease a client can request */ 48 char *lease_file; 49 char *pidfile; 50 char *notify_file; /* What to run whenever leases are written */ 51 uint32_t siaddr; /* next server bootp option */ 52 char *sname; /* bootp server name */ 53 char *boot_file; /* bootp boot file option */ 54 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */ 55}; 56 57extern struct server_config_t server_config; 58extern struct dhcpOfferedAddr *leases; 59 60 61/*** leases.h ***/ 62 63struct dhcpOfferedAddr { 64 uint8_t chaddr[16]; 65 uint32_t yiaddr; /* network order */ 66 uint32_t expires; /* host order */ 67}; 68 69struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease); 70int lease_expired(struct dhcpOfferedAddr *lease); 71struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr); 72struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr); 73uint32_t find_address(int check_expired); 74 75 76/*** static_leases.h ***/ 77 78/* Config file will pass static lease info to this function which will add it 79 * to a data structure that can be searched later */ 80int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip); 81/* Check to see if a mac has an associated static lease */ 82uint32_t getIpByMac(struct static_lease *lease_struct, void *arg); 83/* Check to see if an ip is reserved as a static ip */ 84uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip); 85/* Print out static leases just to check what's going on (debug code) */ 86void printStaticLeases(struct static_lease **lease_struct); 87 88 89/*** serverpacket.h ***/ 90 91int sendOffer(struct dhcpMessage *oldpacket); 92int sendNAK(struct dhcpMessage *oldpacket); 93int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr); 94int send_inform(struct dhcpMessage *oldpacket); 95 96 97/*** files.h ***/ 98 99int read_config(const char *file); 100void write_leases(void); 101void read_leases(const char *file); 102struct option_set *find_option(struct option_set *opt_list, char code); 103 104 105#endif 106