1 /* vi: set sw=4 ts=4: */ 2 /* 3 * Licensed under GPLv2, see file LICENSE in this source tree. 4 */ 5 #ifndef UDHCP_DHCPD_H 6 #define UDHCP_DHCPD_H 1 7 8 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN 9 10 /* Defaults you may want to tweak */ 11 /* Default max_lease_sec */ 12 #define DEFAULT_LEASE_TIME (60*60*24 * 10) 13 #define LEASES_FILE CONFIG_DHCPD_LEASES_FILE 14 /* Where to find the DHCP server configuration file */ 15 #define DHCPD_CONF_FILE "/etc/udhcpd.conf" 16 17 18 struct static_lease; 19 20 struct server_data_t { 21 char *interface; /* interface to use */ 22 //TODO: ifindex, server_nip, server_mac 23 // are obtained from interface name. 24 // Instead of querying them *once*, create update_server_network_data_cache() 25 // and call it before any usage of these fields. 26 // update_server_network_data_cache() must re-query data 27 // if more than N seconds have passed after last use. 28 int ifindex; 29 uint32_t server_nip; 30 #if ENABLE_FEATURE_UDHCP_PORT 31 uint16_t port; 32 #endif 33 uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */ 34 struct option_set *options; /* list of DHCP options loaded from the config file */ 35 /* start,end are in host order: we need to compare start <= ip <= end */ 36 uint32_t start_ip; /* start address of leases, in host order */ 37 uint32_t end_ip; /* end of leases, in host order */ 38 uint32_t max_lease_sec; /* maximum lease time (host order) */ 39 uint32_t min_lease_sec; /* minimum lease time a client can request */ 40 uint32_t max_leases; /* maximum number of leases (including reserved addresses) */ 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 siaddr_nip; /* "next server" bootp option */ 48 char *lease_file; 49 char *pidfile; 50 char *notify_file; /* what to run whenever leases are written */ 51 char *sname; /* bootp server name */ 52 char *boot_file; /* bootp boot file option */ 53 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */ 54 } FIX_ALIASING; 55 56 #define server_data (*(struct server_data_t*)bb_common_bufsiz1) 57 /* client_data sits in 2nd half of bb_common_bufsiz1 */ 58 59 #if ENABLE_FEATURE_UDHCP_PORT 60 #define SERVER_PORT (server_data.port) 61 #define SERVER_PORT6 (server_data.port) 62 #else 63 #define SERVER_PORT 67 64 #define SERVER_PORT6 547 65 #endif 66 67 68 typedef uint32_t leasetime_t; 69 typedef int32_t signed_leasetime_t; 70 71 struct dyn_lease { 72 /* Unix time when lease expires. Kept in memory in host order. 73 * When written to file, converted to network order 74 * and adjusted (current time subtracted) */ 75 leasetime_t expires; 76 /* "nip": IP in network order */ 77 uint32_t lease_nip; 78 /* We use lease_mac[6], since e.g. ARP probing uses 79 * only 6 first bytes anyway. We check received dhcp packets 80 * that their hlen == 6 and thus chaddr has only 6 significant bytes 81 * (dhcp packet has chaddr[16], not [6]) 82 */ 83 uint8_t lease_mac[6]; 84 char hostname[20]; 85 uint8_t pad[2]; 86 /* total size is a multiply of 4 */ 87 } PACKED; 88 89 POP_SAVED_FUNCTION_VISIBILITY 90 91 #endif 92