/* 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 */
+/*
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#ifndef UDHCP_DHCPD_H
+#define UDHCP_DHCPD_H 1
+
+PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
+
+/* Defaults you may want to tweak */
+/* Default max_lease_sec */
+#define DEFAULT_LEASE_TIME (60*60*24 * 10)
+#define LEASES_FILE CONFIG_DHCPD_LEASES_FILE
+/* Where to find the DHCP server configuration file */
#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
-struct option_set {
- uint8_t *data;
- struct option_set *next;
-};
struct static_lease {
struct static_lease *next;
- uint8_t *mac;
- uint32_t *ip;
+ uint32_t nip;
+ uint8_t mac[6];
};
struct server_config_t {
- uint32_t server; /* Our IP, in network order */
+ char *interface; /* interface to use */
+//TODO: ifindex, server_nip, server_mac
+// are obtained from interface name.
+// Instead of querying them *once*, create update_server_network_data_cache()
+// and call it before any usage of these fields.
+// update_server_network_data_cache() must re-query data
+// if more than N seconds have passed after last use.
+ int ifindex;
+ uint32_t server_nip;
+#if ENABLE_FEATURE_UDHCP_PORT
+ uint16_t port;
+#endif
+ uint8_t server_mac[6]; /* our MAC address (used only for ARP probing) */
+ struct option_set *options; /* list of DHCP options loaded from the config file */
/* start,end are in host order: we need to compare start <= ip <= end */
- uint32_t start_ip; /* Start address of leases, in host order */
- uint32_t end_ip; /* End of leases, in host 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 */
- char remaining; /* should the lease file be interpreted as lease time remaining, or
- * as the time the lease expires */
- uint32_t lease; /* lease time in seconds (host order) */
- uint32_t max_leases; /* maximum number of leases (including reserved address) */
+ uint32_t start_ip; /* start address of leases, in host order */
+ uint32_t end_ip; /* end of leases, in host order */
+ uint32_t max_lease_sec; /* maximum lease time (host order) */
+ uint32_t min_lease_sec; /* minimum lease time a client can request */
+ uint32_t max_leases; /* maximum number of leases (including reserved addresses) */
uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
* if this is zero, it will only write one on SIGUSR1 */
uint32_t decline_time; /* how long an address is reserved if a client returns a
* decline message */
uint32_t conflict_time; /* how long an arp conflict offender is leased for */
uint32_t offer_time; /* how long an offered address is reserved */
- uint32_t min_lease; /* minimum lease a client can request */
+ uint32_t siaddr_nip; /* "next server" bootp option */
char *lease_file;
char *pidfile;
- char *notify_file; /* What to run whenever leases are written */
- uint32_t siaddr; /* next server bootp option */
+ char *notify_file; /* what to run whenever leases are written */
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 */
-};
+} FIX_ALIASING;
#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
+/* client_config sits in 2nd half of bb_common_bufsiz1 */
+
+#if ENABLE_FEATURE_UDHCP_PORT
+#define SERVER_PORT (server_config.port)
+#define SERVER_PORT6 (server_config.port)
+#else
+#define SERVER_PORT 67
+#define SERVER_PORT6 547
+#endif
-extern struct dhcpOfferedAddr *leases;
-
-
-/*** leases.h ***/
-
-struct dhcpOfferedAddr {
- uint8_t chaddr[16];
- uint32_t yiaddr; /* network order */
- uint32_t expires; /* host order */
-};
-
-struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
-int lease_expired(struct dhcpOfferedAddr *lease);
-struct dhcpOfferedAddr *find_lease_by_chaddr(const 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);
+typedef uint32_t leasetime_t;
+typedef int32_t signed_leasetime_t;
+
+struct dyn_lease {
+ /* Unix time when lease expires. Kept in memory in host order.
+ * When written to file, converted to network order
+ * and adjusted (current time subtracted) */
+ leasetime_t expires;
+ /* "nip": IP in network order */
+ uint32_t lease_nip;
+ /* We use lease_mac[6], since e.g. ARP probing uses
+ * only 6 first bytes anyway. We check received dhcp packets
+ * that their hlen == 6 and thus chaddr has only 6 significant bytes
+ * (dhcp packet has chaddr[16], not [6])
+ */
+ uint8_t lease_mac[6];
+ char hostname[20];
+ uint8_t pad[2];
+ /* total size is a multiply of 4 */
+} PACKED;
+
+extern struct dyn_lease *g_leases;
+
+struct dyn_lease *add_lease(
+ const uint8_t *chaddr, uint32_t yiaddr,
+ leasetime_t leasetime,
+ const char *hostname, int hostname_len
+ ) FAST_FUNC;
+int is_expired_lease(struct dyn_lease *lease) FAST_FUNC;
+struct dyn_lease *find_lease_by_mac(const uint8_t *mac) FAST_FUNC;
+struct dyn_lease *find_lease_by_nip(uint32_t nip) FAST_FUNC;
+uint32_t find_free_or_expired_nip(const uint8_t *safe_mac) FAST_FUNC;
+
+
+/* Config file parser will pass static lease info to this function
+ * which will add it to a data structure that can be searched later */
+void add_static_lease(struct static_lease **st_lease_pp, uint8_t *mac, uint32_t nip) FAST_FUNC;
+/* Find static lease IP by mac */
+uint32_t get_static_nip_by_mac(struct static_lease *st_lease, void *arg) FAST_FUNC;
+/* Check to see if an IP is reserved as a static IP */
+int is_nip_reserved(struct static_lease *st_lease, uint32_t nip) FAST_FUNC;
/* 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);
+#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
+void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
+#else
+# define log_static_leases(st_lease_pp) ((void)0)
+#endif
-/*** files.h ***/
+void read_config(const char *file) FAST_FUNC;
+void write_leases(void) FAST_FUNC;
+void read_leases(const char *file) FAST_FUNC;
-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, uint8_t code);
+POP_SAVED_FUNCTION_VISIBILITY
#endif
projects / oweals / busybox.git / blobdiff