1 files changed, 190 insertions, 0 deletions

diff --git a/networking/udhcp/dhcpd.h b/networking/udhcp/dhcpd.h
new file mode 100644
index 000000000..40959e4ae
--- /dev/null
+++ b/networking/udhcp/dhcpd.h
@@ -0,0 +1,190 @@
+/* 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