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