-/* dhcpd.h */
-#ifndef _DHCPD_H
-#define _DHCPD_H
-
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-
-#include "libbb_udhcp.h"
-#include "leases.h"
-#include "version.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 */
-
-/* where to find the DHCP server configuration file */
+/* vi: set sw=4 ts=4: */
+/*
+ * 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"
-/*****************************************************************/
-/* 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_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 (unsigned char *) "\xff\xff\xff\xff\xff\xff"
-#define OPT_CODE 0
-#define OPT_LEN 1
-#define OPT_DATA 2
-
-struct option_set {
- unsigned char *data;
- struct option_set *next;
+
+struct static_lease {
+ struct static_lease *next;
+ uint32_t nip;
+ uint8_t mac[6];
};
struct server_config_t {
- u_int32_t server; /* Our IP, in network order */
- u_int32_t start; /* Start address of leases, network order */
- u_int32_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 */
- unsigned char 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 *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 */
+ 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 siaddr_nip; /* "next server" bootp option */
char *lease_file;
char *pidfile;
- char *notify_file; /* What to run whenever leases are written */
- u_int32_t siaddr; /* next server bootp option */
- char *sname; /* bootp server name */
- char *boot_file; /* bootp boot file option */
-};
-
-extern struct server_config_t server_config;
-extern struct dhcpOfferedAddr *leases;
-
+ 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
+
+
+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) */
+#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
+
+
+void read_config(const char *file) FAST_FUNC;
+void write_leases(void) FAST_FUNC;
+void read_leases(const char *file) FAST_FUNC;
+
+
+POP_SAVED_FUNCTION_VISIBILITY
#endif
projects / oweals / busybox.git / blobdiff