path: root/sbin/dhclient/dhcpd.h

/*	$OpenBSD: dhcpd.h,v 1.3 2004/02/04 12:16:56 henning Exp $	*/

/* Definitions for dhcpd... */

/*
 * Copyright (c) 1995, 1996, 1997, 1998, 1999
 * The Internet Software Consortium.    All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of The Internet Software Consortium nor the names
 *    of its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This software has been written for the Internet Software Consortium
 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
 * Enterprises.  To learn more about the Internet Software Consortium,
 * see ``http://www.vix.com/isc''.  To learn more about Vixie
 * Enterprises, see ``http://www.vix.com''.
 */

#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <ctype.h>
#include <time.h>

#include "osdep.h"
#include "dhcp.h"
#include "tree.h"
#include "hash.h"
#include "inet.h"

struct option_data {
	int len;
	u_int8_t *data;
};

struct string_list {
	struct string_list *next;
	char *string;
};

/* A name server, from /etc/resolv.conf. */
struct name_server {
	struct name_server *next;
	struct sockaddr_in addr;
	TIME rcdate;
};

/* A domain search list element. */
struct domain_search_list {
	struct domain_search_list *next;
	char *domain;
	TIME rcdate;
};

/* A dhcp packet and the pointers to its option values. */
struct packet {
	struct dhcp_packet *raw;
	int packet_length;
	int packet_type;
	int options_valid;
	int client_port;
	struct iaddr client_addr;
	struct interface_info *interface;	/* Interface on which packet
						   was received. */
	struct hardware *haddr;		/* Physical link address
					   of local sender (maybe gateway). */
	struct shared_network *shared_network;
	struct option_data options [256];
	int got_requested_address;	/* True if client sent the
					   dhcp-requested-address option. */
};

struct hardware {
	u_int8_t htype;
	u_int8_t hlen;
	u_int8_t haddr [16];
};

/* A dhcp lease declaration structure. */
struct lease {
	struct lease *next;
	struct lease *prev;
	struct lease *n_uid, *n_hw;
	struct lease *waitq_next;

	struct iaddr ip_addr;
	TIME starts, ends, timestamp;
	unsigned char *uid;
	int uid_len;
	int uid_max;
	unsigned char uid_buf [32];
	char *hostname;
	char *client_hostname;
	struct host_decl *host;
	struct subnet *subnet;
	struct shared_network *shared_network;
	struct hardware hardware_addr;

	int flags;
#       define STATIC_LEASE		1
#       define BOOTP_LEASE		2
#	define DYNAMIC_BOOTP_OK		4
#	define PERSISTENT_FLAGS		(DYNAMIC_BOOTP_OK)
#	define EPHEMERAL_FLAGS		(BOOTP_LEASE)
#	define MS_NULL_TERMINATION	8
#	define ABANDONED_LEASE		16

	struct lease_state *state;
	u_int8_t releasing;
};

struct lease_state {
	struct lease_state *next;

	struct interface_info *ip;

	TIME offered_expiry;

	struct tree_cache *options [256];
	u_int32_t expiry, renewal, rebind;
	char filename [DHCP_FILE_LEN];
	char *server_name;

	struct iaddr from;

	int max_message_size;
	u_int8_t *prl;
	int prl_len;
	int got_requested_address;	/* True if client sent the
					   dhcp-requested-address option. */
	int got_server_identifier;	/* True if client sent the
					   dhcp-server-identifier option. */
	struct shared_network *shared_network;	/* Shared network of interface
						   on which request arrived. */

	u_int32_t xid;
	u_int16_t secs;
	u_int16_t bootp_flags;
	struct in_addr ciaddr;
	struct in_addr giaddr;
	u_int8_t hops;
	u_int8_t offer;
};

#define	ROOT_GROUP	0
#define HOST_DECL	1
#define SHARED_NET_DECL	2
#define SUBNET_DECL	3
#define CLASS_DECL	4
#define	GROUP_DECL	5

/* Possible modes in which discover_interfaces can run. */

#define DISCOVER_RUNNING	0
#define DISCOVER_SERVER		1
#define DISCOVER_UNCONFIGURED	2
#define DISCOVER_RELAY		3
#define DISCOVER_REQUESTED	4

/* Group of declarations that share common parameters. */
struct group {
	struct group *next;

	struct subnet *subnet;
	struct shared_network *shared_network;

	TIME default_lease_time;
	TIME max_lease_time;
	TIME bootp_lease_cutoff;
	TIME bootp_lease_length;

	char *filename;
	char *server_name;	
	struct iaddr next_server;

	int boot_unknown_clients;
	int dynamic_bootp;
	int allow_bootp;
	int allow_booting;
	int one_lease_per_client;
	int get_lease_hostnames;
	int use_host_decl_names;
	int use_lease_addr_for_default_route;
	int authoritative;
	int always_reply_rfc1048;

	struct tree_cache *options [256];
};

/* A dhcp host declaration structure. */
struct host_decl {
	struct host_decl *n_ipaddr;
	char *name;
	struct hardware interface;
	struct tree_cache *fixed_addr;
	struct group *group;
};

struct shared_network {
	struct shared_network *next;
	char *name;
	struct subnet *subnets;
	struct interface_info *interface;
	struct lease *leases;
	struct lease *insertion_point;
	struct lease *last_lease;

	struct group *group;
};

struct subnet {
	struct subnet *next_subnet;
	struct subnet *next_sibling;
	struct shared_network *shared_network;
	struct interface_info *interface;
	struct iaddr interface_address;
	struct iaddr net;
	struct iaddr netmask;

	struct group *group;
};

struct class {
	char *name;

	struct group *group;
};

/* DHCP client lease structure... */
struct client_lease {
	struct client_lease *next;		      /* Next lease in list. */
	TIME expiry, renewal, rebind;			  /* Lease timeouts. */
	struct iaddr address;			    /* Address being leased. */
	char *server_name;			     /* Name of boot server. */
	char *filename;		     /* Name of file we're supposed to boot. */
	struct string_list *medium;			  /* Network medium. */

	unsigned int is_static : 1;    /* If set, lease is from config file. */
	unsigned int is_bootp: 1;   /* If set, lease was aquired with BOOTP. */

	struct option_data options [256];    /* Options supplied with lease. */
};

/* Possible states in which the client can be. */
enum dhcp_state {
	S_REBOOTING,
	S_INIT,
	S_SELECTING,
	S_REQUESTING, 
	S_BOUND,
	S_RENEWING,
	S_REBINDING
};

/* Configuration information from the config file... */
struct client_config {
	struct option_data defaults [256]; /* Default values for options. */
	enum {
		ACTION_DEFAULT,		/* Use server value if present,
					   otherwise default. */
		ACTION_SUPERSEDE,	/* Always use default. */
		ACTION_PREPEND,		/* Prepend default to server. */
		ACTION_APPEND		/* Append default to server. */
	} default_actions [256];

	struct option_data send_options [256]; /* Send these to server. */
	u_int8_t required_options [256]; /* Options server must supply. */
	u_int8_t requested_options [256]; /* Options to request from server. */
	int requested_option_count;	/* Number of requested options. */
	TIME timeout;			/* Start to panic if we don't get a
					   lease in this time period when
					   SELECTING. */
	TIME initial_interval;		/* All exponential backoff intervals
					   start here. */
	TIME retry_interval;		/* If the protocol failed to produce
					   an address before the timeout,
					   try the protocol again after this
					   many seconds. */
	TIME select_interval;		/* Wait this many seconds from the
					   first DHCPDISCOVER before
					   picking an offered lease. */
	TIME reboot_timeout;		/* When in INIT-REBOOT, wait this
					   long before giving up and going
					   to INIT. */
	TIME backoff_cutoff;		/* When doing exponential backoff,
					   never back off to an interval
					   longer than this amount. */
	struct string_list *media;	/* Possible network media values. */
	char *script_name;		/* Name of config script. */
	enum { IGNORE, ACCEPT, PREFER } bootp_policy;
					/* Ignore, accept or prefer BOOTP
					   responses. */
	struct string_list *medium;	/* Current network medium. */

	struct iaddrlist *reject_list;	/* Servers to reject. */
};

/* Per-interface state used in the dhcp client... */
struct client_state {
	struct client_lease *active;		  /* Currently active lease. */
	struct client_lease *new;			       /* New lease. */
	struct client_lease *offered_leases;	    /* Leases offered to us. */
	struct client_lease *leases;		/* Leases we currently hold. */
	struct client_lease *alias;			     /* Alias lease. */

	enum dhcp_state state;		/* Current state for this interface. */
	struct iaddr destination;		    /* Where to send packet. */
	u_int32_t xid;					  /* Transaction ID. */
	u_int16_t secs;			    /* secs value from DHCPDISCOVER. */
	TIME first_sending;			/* When was first copy sent? */
	TIME interval;		      /* What's the current resend interval? */
	struct string_list *medium;		   /* Last media type tried. */

	struct dhcp_packet packet;		    /* Outgoing DHCP packet. */
	int packet_length;	       /* Actual length of generated packet. */

	struct iaddr requested_address;	    /* Address we would like to get. */

	struct client_config *config;	    /* Information from config file. */

	char **scriptEnv;  /* Client script env */
	int scriptEnvsize; /* size of the env table */

	struct string_list *env;	       /* Client script environment. */
	int envc;			/* Number of entries in environment. */
};

/* Information about each network interface. */

struct interface_info {
	struct interface_info *next;	/* Next interface in list... */
	struct shared_network *shared_network;
				/* Networks connected to this interface. */
	struct hardware hw_address;	/* Its physical address. */
	struct in_addr primary_address;	/* Primary interface address. */
	char name [IFNAMSIZ];		/* Its name... */
	int rfdesc;			/* Its read file descriptor. */
	int wfdesc;			/* Its write file descriptor, if
					   different. */
	unsigned char *rbuf;		/* Read buffer, if required. */
	size_t rbuf_max;		/* Size of read buffer. */
	size_t rbuf_offset;		/* Current offset into buffer. */
	size_t rbuf_len;		/* Length of data in buffer. */

	struct ifreq *ifp;		/* Pointer to ifreq struct. */
	u_int32_t flags;		/* Control flags... */
#define INTERFACE_REQUESTED 1
#define INTERFACE_AUTOMATIC 2

	/* Only used by DHCP client code. */
	struct client_state *client;
	int noifmedia;
	int errors;
	int dead;
	u_int16_t	index;
};

struct hardware_link {
	struct hardware_link *next;
	char name [IFNAMSIZ];
	struct hardware address;
};

struct timeout {
	struct timeout *next;
	TIME when;
	void (*func)(void *);
	void *what;
};

struct protocol {
	struct protocol *next;
	int fd;
	void (*handler) (struct protocol *);
	void *local;
};

/* Bitmask of dhcp option codes. */
typedef unsigned char option_mask [16];

/* DHCP Option mask manipulation macros... */
#define OPTION_ZERO(mask)	(memset (mask, 0, 16))
#define OPTION_SET(mask, bit)	(mask [bit >> 8] |= (1 << (bit & 7)))
#define OPTION_CLR(mask, bit)	(mask [bit >> 8] &= ~(1 << (bit & 7)))
#define OPTION_ISSET(mask, bit)	(mask [bit >> 8] & (1 << (bit & 7)))
#define OPTION_ISCLR(mask, bit)	(!OPTION_ISSET (mask, bit))

/* An option occupies its length plus two header bytes (code and
    length) for every 255 bytes that must be stored. */
#define OPTION_SPACE(x)		((x) + 2 * ((x) / 255 + 1))

/* Default path to dhcpd config file. */
#define _PATH_DHCLIENT_CONF	"/etc/dhclient.conf"
#define _PATH_DHCLIENT_PID	"/var/run/dhclient.pid"
#define _PATH_DHCLIENT_DB	"/var/db/dhclient.leases"
#define _PATH_RESOLV_CONF	"/etc/resolv.conf"
#define _PATH_DHCRELAY_PID	"/var/run/dhcrelay.pid"
#define _PATH_DHCLIENT_PID	"/var/run/dhclient.pid"
#define _PATH_DHCLIENT_DB	"/var/db/dhclient.leases"
#define DHCPD_LOG_FACILITY	LOG_DAEMON

#define MAX_TIME 0x7fffffff
#define MIN_TIME 0

/* External definitions... */

/* options.c */

void parse_options (struct packet *);
void parse_option_buffer (struct packet *, unsigned char *, int);
int cons_options (struct packet *, struct dhcp_packet *, int,
			 struct tree_cache **, int, int, int,
			 u_int8_t *, int);
int store_options (unsigned char *, int, struct tree_cache **,
			   unsigned char *, int, int, int, int);
char *pretty_print_option (unsigned int,
				  unsigned char *, int, int, int);
void do_packet (struct interface_info *,
		       struct dhcp_packet *, int,
		       unsigned int, struct iaddr, struct hardware *);

/* errwarn.c */
extern int warnings_occurred;
void error (char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int warn (char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int note (char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int debug (char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));
int parse_warn (char *, ...) __attribute__ ((__format__ (__printf__, 1, 2)));

/* dhcpd.c */
extern TIME cur_time;
extern struct group root_group;

extern u_int16_t local_port;
extern u_int16_t remote_port;
extern int log_priority;
extern int log_perror;

int main (int, char **);
void cleanup (void);

/* conflex.c */
extern int lexline, lexchar;
extern char *token_line, *tlname;
extern char comments [4096];
extern int comment_index;
extern int eol_token;
void new_parse (char *);
int next_token (char **, FILE *);
int peek_token (char **, FILE *);

/* confpars.c */
int readconf (void);
void read_leases (void);
int parse_statement (FILE *,
			    struct group *, int, struct host_decl *, int);
void parse_allow_deny (FILE *, struct group *, int);
void skip_to_semi (FILE *);
int parse_boolean (FILE *);
int parse_semi (FILE *);
int parse_lbrace (FILE *);
void parse_host_declaration (FILE *, struct group *);
char *parse_host_name (FILE *);
void parse_class_declaration (FILE *, struct group *, int);
void parse_lease_time (FILE *, TIME *);
void parse_shared_net_declaration (FILE *, struct group *);
void parse_subnet_declaration (FILE *, struct shared_network *);
void parse_group_declaration (FILE *, struct group *);
void parse_hardware_param (FILE *, struct hardware *);
char *parse_string (FILE *);
struct tree *parse_ip_addr_or_hostname (FILE *, int);
struct tree_cache *parse_fixed_addr_param (FILE *);
void parse_option_param (FILE *, struct group *);
TIME parse_timestamp (FILE *);
struct lease *parse_lease_declaration (FILE *);
void parse_address_range (FILE *, struct subnet *);
TIME parse_date (FILE *);
unsigned char *parse_numeric_aggregate (FILE *,
					       unsigned char *, int *,
					       int, int, int);
void convert_num (unsigned char *, char *, int, int);

/* tree.c */
pair cons (caddr_t, pair);
struct tree_cache *tree_cache (struct tree *);
struct tree *tree_host_lookup (char *);
struct dns_host_entry *enter_dns_host (char *);
struct tree *tree_const (unsigned char *, int);
struct tree *tree_concat (struct tree *, struct tree *);
struct tree *tree_limit (struct tree *, int);
int tree_evaluate (struct tree_cache *);

/* dhcp.c */
extern int outstanding_pings;

void dhcp (struct packet *);
void dhcpdiscover (struct packet *);
void dhcprequest (struct packet *);
void dhcprelease (struct packet *);
void dhcpdecline (struct packet *);
void dhcpinform (struct packet *);
void nak_lease (struct packet *, struct iaddr *cip);
void ack_lease (struct packet *, struct lease *, unsigned int, TIME);
void dhcp_reply (struct lease *);
struct lease *find_lease (struct packet *,
				 struct shared_network *, int *);
struct lease *mockup_lease (struct packet *,
				   struct shared_network *,
				   struct host_decl *);

/* bootp.c */
void bootp (struct packet *);

/* memory.c */
void enter_host (struct host_decl *);
struct host_decl *find_hosts_by_haddr (int, unsigned char *, int);
struct host_decl *find_hosts_by_uid (unsigned char *, int);
struct subnet *find_host_for_network (struct host_decl **,
					     struct iaddr *,
					     struct shared_network *);
void new_address_range (struct iaddr, struct iaddr,
			       struct subnet *, int);
extern struct subnet *find_grouped_subnet (struct shared_network *,
						  struct iaddr);
extern struct subnet *find_subnet (struct iaddr);
void enter_shared_network (struct shared_network *);
int subnet_inner_than (struct subnet *, struct subnet *, int);
void enter_subnet (struct subnet *);
void enter_lease (struct lease *);
int supersede_lease (struct lease *, struct lease *, int);
void release_lease (struct lease *);
void abandon_lease (struct lease *, char *);
struct lease *find_lease_by_uid (unsigned char *, int);
struct lease *find_lease_by_hw_addr (unsigned char *, int);
struct lease *find_lease_by_ip_addr (struct iaddr);
void uid_hash_add (struct lease *);
void uid_hash_delete (struct lease *);
void hw_hash_add (struct lease *);
void hw_hash_delete (struct lease *);
struct class *add_class (int, char *);
struct class *find_class (int, unsigned char *, int);
struct group *clone_group (struct group *, char *);
void write_leases (void);
void dump_subnets (void);

/* alloc.c */
VOIDPTR dmalloc (int, char *);
void dfree (VOIDPTR, char *);
struct packet *new_packet (char *);
struct dhcp_packet *new_dhcp_packet (char *);
struct tree *new_tree (char *);
struct tree_cache *new_tree_cache (char *);
struct hash_table *new_hash_table (int, char *);
struct hash_bucket *new_hash_bucket (char *);
struct lease *new_lease (char *);
struct lease *new_leases (int, char *);
struct subnet *new_subnet (char *);
struct class *new_class (char *);
struct shared_network *new_shared_network (char *);
struct group *new_group (char *);
struct protocol *new_protocol (char *);
struct lease_state *new_lease_state (char *);
struct domain_search_list *new_domain_search_list (char *);
struct name_server *new_name_server (char *);
struct string_list *new_string_list (size_t size, char * name);
void free_name_server (struct name_server *, char *);
void free_domain_search_list (struct domain_search_list *, char *);
void free_lease_state (struct lease_state *, char *);
void free_protocol (struct protocol *, char *);
void free_group (struct group *, char *);
void free_shared_network (struct shared_network *, char *);
void free_class (struct class *, char *);
void free_subnet (struct subnet *, char *);
void free_lease (struct lease *, char *);
void free_hash_bucket (struct hash_bucket *, char *);
void free_hash_table (struct hash_table *, char *);
void free_tree_cache (struct tree_cache *, char *);
void free_packet (struct packet *, char *);
void free_dhcp_packet (struct dhcp_packet *, char *);
void free_tree (struct tree *, char *);
void free_string_list (struct string_list *, char *);

/* print.c */
char *print_hw_addr (int, int, unsigned char *);
void print_lease (struct lease *);
void dump_raw (unsigned char *, int);
void dump_packet (struct packet *);
void hash_dump (struct hash_table *);

/* socket.c */
#if defined (USE_SOCKET_SEND) || defined (USE_SOCKET_RECEIVE) \
	|| defined (USE_SOCKET_FALLBACK)
int if_register_socket (struct interface_info *);
#endif

#if defined (USE_SOCKET_FALLBACK) && !defined (USE_SOCKET_SEND)
void if_reinitialize_fallback (struct interface_info *);
void if_register_fallback (struct interface_info *);
ssize_t send_fallback (struct interface_info *,
			      struct packet *, struct dhcp_packet *, size_t, 
			      struct in_addr,
			      struct sockaddr_in *, struct hardware *);
#endif

#ifdef USE_SOCKET_SEND
void if_reinitialize_send (struct interface_info *);
void if_register_send (struct interface_info *);
ssize_t send_packet (struct interface_info *,
			    struct packet *, struct dhcp_packet *, size_t, 
			    struct in_addr,
			    struct sockaddr_in *, struct hardware *);
#endif
#if defined (USE_SOCKET_FALLBACK)
void fallback_discard (struct protocol *);
#endif
#ifdef USE_SOCKET_RECEIVE
void if_reinitialize_receive (struct interface_info *);
void if_register_receive (struct interface_info *);
ssize_t receive_packet (struct interface_info *,
			       unsigned char *, size_t,
			       struct sockaddr_in *, struct hardware *);
#endif
#if defined (USE_SOCKET_SEND)
int can_unicast_without_arp (void);
int can_receive_unicast_unconfigured (struct interface_info *);
void maybe_setup_fallback (void);
#endif

/* bpf.c */
#if defined (USE_BPF_SEND) || defined (USE_BPF_RECEIVE)
int if_register_bpf  (struct interface_info *);
#endif
#ifdef USE_BPF_SEND
void if_reinitialize_send (struct interface_info *);
void if_register_send (struct interface_info *);
ssize_t send_packet (struct interface_info *,
			    struct packet *, struct dhcp_packet *, size_t,
			    struct in_addr,
			    struct sockaddr_in *, struct hardware *);
#endif
#ifdef USE_BPF_RECEIVE
void if_reinitialize_receive (struct interface_info *);
void if_register_receive (struct interface_info *);
ssize_t receive_packet (struct interface_info *,
			       unsigned char *, size_t,
			       struct sockaddr_in *, struct hardware *);
#endif
#if defined (USE_BPF_SEND)
int can_unicast_without_arp (void);
int can_receive_unicast_unconfigured (struct interface_info *);
void maybe_setup_fallback (void);
#endif

/* raw.c */
#ifdef USE_RAW_SEND
void if_reinitialize_send (struct interface_info *);
void if_register_send (struct interface_info *);
ssize_t send_packet (struct interface_info *,
			    struct packet *, struct dhcp_packet *, size_t,
			    struct in_addr,
			    struct sockaddr_in *, struct hardware *);
int can_unicast_without_arp (void);
int can_receive_unicast_unconfigured (struct interface_info *);
void maybe_setup_fallback (void);
#endif

/* dispatch.c */
extern struct interface_info *interfaces,
	*dummy_interfaces, *fallback_interface;
extern struct protocol *protocols;
extern int quiet_interface_discovery;
extern void (*bootp_packet_handler) (struct interface_info *,
					    struct dhcp_packet *, int,
					    unsigned int,
					    struct iaddr, struct hardware *);
extern struct timeout *timeouts;
void discover_interfaces (int);
struct interface_info *setup_fallback (void);
void reinitialize_interfaces (void);
void dispatch (void);
int locate_network (struct packet *);
void got_one (struct protocol *);
void add_timeout (TIME, void (*)(void *), void *);
void cancel_timeout (void (*) (void *), void *);
void add_protocol (char *, int, void (*)(struct protocol *), void *);

void remove_protocol (struct protocol *);

/* hash.c */
struct hash_table *new_hash (void);
void add_hash (struct hash_table *, unsigned char *,
		      int, unsigned char *);
void delete_hash_entry (struct hash_table *, unsigned char *, int);
unsigned char *hash_lookup (struct hash_table *, unsigned char *, int);

/* tables.c */
extern struct option dhcp_options [256];
extern unsigned char dhcp_option_default_priority_list [];
extern int sizeof_dhcp_option_default_priority_list;
extern char *hardware_types [256];
extern struct hash_table universe_hash;
extern struct universe dhcp_universe;
void initialize_universes (void);

/* convert.c */
u_int32_t getULong (unsigned char *);
int32_t getLong (unsigned char *);
u_int16_t getUShort (unsigned char *);
int16_t getShort (unsigned char *);
void putULong (unsigned char *, u_int32_t);
void putLong (unsigned char *, int32_t);
void putUShort (unsigned char *, unsigned int);
void putShort (unsigned char *, int);

/* inet.c */
struct iaddr subnet_number (struct iaddr, struct iaddr);
struct iaddr ip_addr (struct iaddr, struct iaddr, u_int32_t);
struct iaddr broadcast_addr (struct iaddr, struct iaddr);
u_int32_t host_addr (struct iaddr, struct iaddr);
int addr_eq (struct iaddr, struct iaddr);
char *piaddr (struct iaddr);

/* dhclient.c */
extern char *path_dhclient_conf;
extern char *path_dhclient_db;
extern char *path_dhclient_pid;
extern int interfaces_requested;

extern struct client_config top_level_config;

void dhcpoffer (struct packet *);
void dhcpack (struct packet *);
void dhcpnak (struct packet *);

void send_discover (void *);
void send_request (void *);
void send_release (void *);
void send_decline (void *);

void state_reboot (void *);
void state_init (void *);
void state_selecting (void *);
void state_requesting (void *);
void state_bound (void *);
void state_panic (void *);

void bind_lease (struct interface_info *);

void make_discover (struct interface_info *, struct client_lease *);
void make_request (struct interface_info *, struct client_lease *);
void make_decline (struct interface_info *, struct client_lease *);
void make_release (struct interface_info *, struct client_lease *);

void free_client_lease (struct client_lease *);
void rewrite_client_leases (void);
void write_client_lease (struct interface_info *,
				 struct client_lease *, int);

void script_init (struct interface_info *, char *,
			 struct string_list *);
void script_write_params (struct interface_info *,
				 char *, struct client_lease *);
int script_go (struct interface_info *);
void client_envadd (struct client_state *,
			   const char *, const char *, const char *, ...);
void script_set_env (struct client_state *, const char *, const char *,
		     const char *);
void script_flush_env(struct client_state *);
int dhcp_option_ev_name (char *, size_t, struct option *);

struct client_lease *packet_to_lease (struct packet *);
void go_daemon (void);
void write_client_pid_file (void);
void client_location_changed (void);

/* db.c */
int write_lease (struct lease *);
int commit_leases (void);
void db_startup (void);
void new_lease_file (void);

/* packet.c */
u_int32_t checksum (unsigned char *, unsigned, u_int32_t);
u_int32_t wrapsum (u_int32_t);
void assemble_hw_header (struct interface_info *, unsigned char *,
				int *, struct hardware *);
void assemble_udp_ip_header (struct interface_info *, unsigned char *,
				    int *, u_int32_t, u_int32_t, unsigned int,
				    unsigned char *, int);
ssize_t decode_hw_header (struct interface_info *, unsigned char *,
				 int, struct hardware *);
ssize_t decode_udp_ip_header (struct interface_info *, unsigned char *,
				     int, struct sockaddr_in *,
				     unsigned char *, int);

/* ethernet.c */
void assemble_ethernet_header (struct interface_info *, unsigned char *,
				      int *, struct hardware *);
ssize_t decode_ethernet_header (struct interface_info *,
				       unsigned char *,
				       int, struct hardware *);

/* tr.c */
void assemble_tr_header (struct interface_info *, unsigned char *,
				int *, struct hardware *);
ssize_t decode_tr_header (struct interface_info *,
				 unsigned char *,
				 int, struct hardware *);

/* dhxpxlt.c */
void convert_statement (FILE *);
void convert_host_statement (FILE *, jrefproto);
void convert_host_name (FILE *, jrefproto);
void convert_class_statement (FILE *, jrefproto, int);
void convert_class_decl (FILE *, jrefproto);
void convert_lease_time (FILE *, jrefproto, char *);
void convert_shared_net_statement (FILE *, jrefproto);
void convert_subnet_statement (FILE *, jrefproto);
void convert_subnet_decl (FILE *, jrefproto);
void convert_host_decl (FILE *, jrefproto);
void convert_hardware_decl (FILE *, jrefproto);
void convert_hardware_addr (FILE *, jrefproto);
void convert_filename_decl (FILE *, jrefproto);
void convert_servername_decl (FILE *, jrefproto);
void convert_ip_addr_or_hostname (FILE *, jrefproto, int);
void convert_fixed_addr_decl (FILE *, jrefproto);
void convert_option_decl (FILE *, jrefproto);
void convert_timestamp (FILE *, jrefproto);
void convert_lease_statement (FILE *, jrefproto);
void convert_address_range (FILE *, jrefproto);
void convert_date (FILE *, jrefproto, char *);
void convert_numeric_aggregate (FILE *, jrefproto, int, int, int, int);
void indent (int);

/* route.c */
void add_route_direct (struct interface_info *, struct in_addr);
void add_route_net (struct interface_info *, struct in_addr,
			   struct in_addr);
void add_route_default_gateway (struct interface_info *, 
				       struct in_addr);
void remove_routes (struct in_addr);
void remove_if_route (struct interface_info *, struct in_addr);
void remove_all_if_routes (struct interface_info *);
void set_netmask (struct interface_info *, struct in_addr);
void set_broadcast_addr (struct interface_info *, struct in_addr);
void set_ip_address (struct interface_info *, struct in_addr);

/* clparse.c */
int read_client_conf (void);
void read_client_leases (void);
void parse_client_statement (FILE *, struct interface_info *,
				    struct client_config *);
int parse_X (FILE *, u_int8_t *, int);
int parse_option_list (FILE *, u_int8_t *);
void parse_interface_declaration (FILE *, struct client_config *);
struct interface_info *interface_or_dummy (char *);
void make_client_state (struct interface_info *);
void make_client_config (struct interface_info *,
				struct client_config *);
void parse_client_lease_statement (FILE *, int);
void parse_client_lease_declaration (FILE *, struct client_lease *,
					    struct interface_info **);
struct option *parse_option_decl (FILE *, struct option_data *);
void parse_string_list (FILE *, struct string_list **, int);
int parse_ip_addr (FILE *, struct iaddr *);
void parse_reject_statement (FILE *, struct client_config *);

/* dhcrelay.c */
void relay (struct interface_info *, struct dhcp_packet *, int,
		   unsigned int, struct iaddr, struct hardware *);

/* icmp.c */
void icmp_startup (int, void (*)(struct iaddr, u_int8_t *, int));
int icmp_echorequest (struct iaddr *);
void icmp_echoreply (struct protocol *);

/* dns.c */
void dns_startup (void);
int ns_inaddr_lookup (u_int16_t, struct iaddr);
void dns_packet (struct protocol *);

/* resolv.c */
extern char path_resolv_conf [];
struct name_server *name_servers;
struct domain_search_list *domains;

void read_resolv_conf (TIME);
struct sockaddr_in *pick_name_server (void);