/* vi: set sw=4 ts=4: */ /* dhcpd.h */ #ifndef _DHCPD_H #define _DHCPD_H /************************************/ /* Defaults _you_ may want to tweak */ /************************************/ /* the period of time the client is allowed to use that address */ #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */ #define LEASES_FILE "/var/lib/misc/udhcpd.leases" /* where to find the DHCP server configuration file */ #define DHCPD_CONF_FILE "/etc/udhcpd.conf" /*****************************************************************/ /* Do not modify below here unless you know what you are doing!! */ /*****************************************************************/ /* DHCP protocol -- see RFC 2131 */ #define SERVER_PORT 67 #define CLIENT_PORT 68 #define DHCP_MAGIC 0x63825363 /* DHCP option codes (partial list) */ #define DHCP_PADDING 0x00 #define DHCP_SUBNET 0x01 #define DHCP_TIME_OFFSET 0x02 #define DHCP_ROUTER 0x03 #define DHCP_TIME_SERVER 0x04 #define DHCP_NAME_SERVER 0x05 #define DHCP_DNS_SERVER 0x06 #define DHCP_LOG_SERVER 0x07 #define DHCP_COOKIE_SERVER 0x08 #define DHCP_LPR_SERVER 0x09 #define DHCP_HOST_NAME 0x0c #define DHCP_BOOT_SIZE 0x0d #define DHCP_DOMAIN_NAME 0x0f #define DHCP_SWAP_SERVER 0x10 #define DHCP_ROOT_PATH 0x11 #define DHCP_IP_TTL 0x17 #define DHCP_MTU 0x1a #define DHCP_BROADCAST 0x1c #define DHCP_NTP_SERVER 0x2a #define DHCP_WINS_SERVER 0x2c #define DHCP_REQUESTED_IP 0x32 #define DHCP_LEASE_TIME 0x33 #define DHCP_OPTION_OVER 0x34 #define DHCP_MESSAGE_TYPE 0x35 #define DHCP_SERVER_ID 0x36 #define DHCP_PARAM_REQ 0x37 #define DHCP_MESSAGE 0x38 #define DHCP_MAX_SIZE 0x39 #define DHCP_T1 0x3a #define DHCP_T2 0x3b #define DHCP_VENDOR 0x3c #define DHCP_CLIENT_ID 0x3d #define DHCP_FQDN 0x51 #define DHCP_END 0xFF #define BOOTREQUEST 1 #define BOOTREPLY 2 #define ETH_10MB 1 #define ETH_10MB_LEN 6 #define DHCPDISCOVER 1 #define DHCPOFFER 2 #define DHCPREQUEST 3 #define DHCPDECLINE 4 #define DHCPACK 5 #define DHCPNAK 6 #define DHCPRELEASE 7 #define DHCPINFORM 8 #define BROADCAST_FLAG 0x8000 #define OPTION_FIELD 0 #define FILE_FIELD 1 #define SNAME_FIELD 2 /* miscellaneous defines */ #define MAC_BCAST_ADDR (uint8_t *) "\xff\xff\xff\xff\xff\xff" #define OPT_CODE 0 #define OPT_LEN 1 #define OPT_DATA 2 struct option_set { uint8_t *data; struct option_set *next; }; struct static_lease { uint8_t *mac; uint32_t *ip; struct static_lease *next; }; struct server_config_t { uint32_t server; /* Our IP, in network order */ uint32_t start; /* Start address of leases, network order */ uint32_t end; /* End of leases, network order */ struct option_set *options; /* List of DHCP options loaded from the config file */ char *interface; /* The name of the interface to use */ int ifindex; /* Index number of the interface to use */ uint8_t arp[6]; /* Our arp address */ unsigned long lease; /* lease time in seconds (host order) */ unsigned long max_leases; /* maximum number of leases (including reserved address) */ char remaining; /* should the lease file be interpreted as lease time remaining, or * as the time the lease expires */ unsigned long auto_time; /* how long should udhcpd wait before writing a config file. * if this is zero, it will only write one on SIGUSR1 */ unsigned long decline_time; /* how long an address is reserved if a client returns a * decline message */ unsigned long conflict_time; /* how long an arp conflict offender is leased for */ unsigned long offer_time; /* how long an offered address is reserved */ unsigned long min_lease; /* minimum lease a client can request*/ char *lease_file; char *pidfile; char *notify_file; /* What to run whenever leases are written */ uint32_t siaddr; /* next server bootp option */ char *sname; /* bootp server name */ char *boot_file; /* bootp boot file option */ struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */ }; extern struct server_config_t server_config; extern struct dhcpOfferedAddr *leases; /*** leases.h ***/ struct dhcpOfferedAddr { uint8_t chaddr[16]; uint32_t yiaddr; /* network order */ uint32_t expires; /* host order */ }; extern uint8_t blank_chaddr[]; void clear_lease(uint8_t *chaddr, uint32_t yiaddr); struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease); int lease_expired(struct dhcpOfferedAddr *lease); struct dhcpOfferedAddr *oldest_expired_lease(void); struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr); struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr); uint32_t find_address(int check_expired); /*** static_leases.h ***/ /* Config file will pass static lease info to this function which will add it * to a data structure that can be searched later */ int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip); /* Check to see if a mac has an associated static lease */ uint32_t getIpByMac(struct static_lease *lease_struct, void *arg); /* Check to see if an ip is reserved as a static ip */ uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip); /* Print out static leases just to check what's going on (debug code) */ void printStaticLeases(struct static_lease **lease_struct); /*** serverpacket.h ***/ int sendOffer(struct dhcpMessage *oldpacket); int sendNAK(struct dhcpMessage *oldpacket); int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr); int send_inform(struct dhcpMessage *oldpacket); /*** files.h ***/ struct config_keyword { const char *keyword; int (* const handler)(const char *line, void *var); void *var; const char *def; }; int read_config(const char *file); void write_leases(void); void read_leases(const char *file); struct option_set *find_option(struct option_set *opt_list, char code); #endif