dhcpd.h

DHCP服务器源码

#define	SV_USE_LEASE_ADDR_FOR_DEFAULT_ROUTE	13
#define	SV_MIN_SECS			14
#define	SV_FILENAME			15
#define SV_SERVER_NAME			16
#define	SV_NEXT_SERVER			17
#define SV_AUTHORITATIVE		18
#define SV_VENDOR_OPTION_SPACE		19
#define SV_ALWAYS_REPLY_RFC1048		20
#define SV_SITE_OPTION_SPACE		21
#define SV_ALWAYS_BROADCAST		22
#define SV_DDNS_DOMAIN_NAME		23
#define SV_DDNS_HOST_NAME		24
#define SV_DDNS_REV_DOMAIN_NAME		25
#define SV_LEASE_FILE_NAME		26
#define SV_PID_FILE_NAME		27
#define SV_DUPLICATES			28
#define SV_DECLINES			29
#define SV_DDNS_UPDATES			30
#define SV_OMAPI_PORT			31
#define SV_LOCAL_PORT			32
#define SV_LIMITED_BROADCAST_ADDRESS	33
#define SV_REMOTE_PORT			34
#define SV_LOCAL_ADDRESS		35
#define SV_OMAPI_KEY			36
#define SV_STASH_AGENT_OPTIONS		37
#define SV_DDNS_TTL			38
#define SV_DDNS_UPDATE_STYLE		39
#define SV_CLIENT_UPDATES		40
#define SV_UPDATE_OPTIMIZATION		41
#define SV_PING_CHECKS			42
#define SV_UPDATE_STATIC_LEASES		43
#define SV_LOG_FACILITY			44
#define SV_DO_FORWARD_UPDATES		45
#define SV_PING_TIMEOUT         46

#if !defined (DEFAULT_PING_TIMEOUT)
# define DEFAULT_PING_TIMEOUT 1
#endif

#if !defined (DEFAULT_DEFAULT_LEASE_TIME)
# define DEFAULT_DEFAULT_LEASE_TIME 43200
#endif

#if !defined (DEFAULT_MIN_LEASE_TIME)
# define DEFAULT_MIN_LEASE_TIME 0
#endif

#if !defined (DEFAULT_MAX_LEASE_TIME)
# define DEFAULT_MAX_LEASE_TIME 86400
#endif

#if !defined (DEFAULT_DDNS_TTL)
# define DEFAULT_DDNS_TTL 3600
#endif

/* Client option names */

#define	CL_TIMEOUT		1
#define	CL_SELECT_INTERVAL	2
#define CL_REBOOT_TIMEOUT	3
#define CL_RETRY_INTERVAL	4
#define CL_BACKOFF_CUTOFF	5
#define CL_INITIAL_INTERVAL	6
#define CL_BOOTP_POLICY		7
#define	CL_SCRIPT_NAME		8
#define CL_REQUESTED_OPTIONS	9
#define CL_REQUESTED_LEASE_TIME	10
#define CL_SEND_OPTIONS		11
#define CL_MEDIA		12
#define	CL_REJECT_LIST		13

#ifndef CL_DEFAULT_TIMEOUT
# define CL_DEFAULT_TIMEOUT	60
#endif

#ifndef CL_DEFAULT_SELECT_INTERVAL
# define CL_DEFAULT_SELECT_INTERVAL 0
#endif

#ifndef CL_DEFAULT_REBOOT_TIMEOUT
# define CL_DEFAULT_REBOOT_TIMEOUT 10
#endif

#ifndef CL_DEFAULT_RETRY_INTERVAL
# define CL_DEFAULT_RETRY_INTERVAL 300
#endif

#ifndef CL_DEFAULT_BACKOFF_CUTOFF
# define CL_DEFAULT_BACKOFF_CUTOFF 120
#endif

#ifndef CL_DEFAULT_INITIAL_INTERVAL
# define CL_DEFAULT_INITIAL_INTERVAL 10
#endif

#ifndef CL_DEFAULT_BOOTP_POLICY
# define CL_DEFAULT_BOOTP_POLICY P_ACCEPT
#endif

#ifndef CL_DEFAULT_REQUESTED_OPTIONS
# define CL_DEFAULT_REQUESTED_OPTIONS \
	{ DHO_SUBNET_MASK, \
	  DHO_BROADCAST_ADDRESS, \
	  DHO_TIME_OFFSET, \
	  DHO_ROUTERS, \
	  DHO_DOMAIN_NAME, \
	  DHO_DOMAIN_NAME_SERVERS, \
	  DHO_HOST_NAME }
#endif

struct group_object {
	OMAPI_OBJECT_PREAMBLE;

	struct group_object *n_dynamic;
	struct group *group;
	char *name;
	int flags;
#define GROUP_OBJECT_DELETED	1
#define GROUP_OBJECT_DYNAMIC	2
#define GROUP_OBJECT_STATIC	4
};

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

	int refcnt;
	struct group_object *object;
	struct subnet *subnet;
	struct shared_network *shared_network;
	int authoritative;
	struct executable_statement *statements;
};

/* A dhcp host declaration structure. */
struct host_decl {
	OMAPI_OBJECT_PREAMBLE;
	struct host_decl *n_ipaddr;
	struct host_decl *n_dynamic;
	char *name;
	struct hardware interface;
	struct data_string client_identifier;
	struct option_cache *fixed_addr;
	struct group *group;
	struct group_object *named_group;
	struct data_string auth_key_id;
	int flags;
#define HOST_DECL_DELETED	1
#define HOST_DECL_DYNAMIC	2
#define HOST_DECL_STATIC	4
};

struct permit {
	struct permit *next;
	enum {
		permit_unknown_clients,
		permit_known_clients,
		permit_authenticated_clients,
		permit_unauthenticated_clients,
		permit_all_clients,
		permit_dynamic_bootp_clients,
		permit_class
	} type;
	struct class *class;
};

struct pool {
	OMAPI_OBJECT_PREAMBLE;
	struct pool *next;
	struct group *group;
	struct shared_network *shared_network;
	struct permit *permit_list;
	struct permit *prohibit_list;
	struct lease *active;
	struct lease *expired;
	struct lease *free;
	struct lease *backup;
	struct lease *abandoned;
	TIME next_event_time;
	int lease_count;
	int free_leases;
	int backup_leases;
	int index;
#if defined (FAILOVER_PROTOCOL)
	dhcp_failover_state_t *failover_peer;
#endif
};

struct shared_network {
	OMAPI_OBJECT_PREAMBLE;
	struct shared_network *next;
	char *name;
	struct subnet *subnets;
	struct interface_info *interface;
	struct pool *pools;
	struct group *group;
#if defined (FAILOVER_PROTOCOL)
	dhcp_failover_state_t *failover_peer;
#endif
};

struct subnet {
	OMAPI_OBJECT_PREAMBLE;
	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 collection {
	struct collection *next;
	
	const char *name;
	struct class *classes;
};

/* XXX classes must be reference-counted. */
struct class {
	OMAPI_OBJECT_PREAMBLE;
	struct class *nic;		/* Next in collection. */
	struct class *superclass;	/* Set for spawned classes only. */
	char *name;			/* Not set for spawned classes. */

	/* A class may be configured to permit a limited number of leases. */
	int lease_limit;
	int leases_consumed;
	struct lease **billed_leases;

	/* If nonzero, class has not been saved since it was last
	   modified. */
	int dirty;

	/* Hash table containing subclasses. */
	class_hash_t *hash;
	struct data_string hash_string;

	/* Expression used to match class. */
	struct expression *expr;

	/* Expression used to compute subclass identifiers for spawning
	   and to do subclass matching. */
	struct expression *submatch;
	int spawning;
	
	struct group *group;

	/* Statements to execute if class matches. */
	struct executable_statement *statements;
};

/* 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. */
	struct auth_key *key;      /* Key used in basic DHCP authentication. */

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

	struct option_state *options;	     /* Options supplied with lease. */
};

/* Possible states in which the client can be. */
enum dhcp_state {
	S_REBOOTING = 1,
	S_INIT = 2,
	S_SELECTING = 3,
	S_REQUESTING = 4, 
	S_BOUND = 5,
	S_RENEWING = 6,
	S_REBINDING = 7,
	S_STOPPED = 8
};

/* Authentication and BOOTP policy possibilities (not all values work
   for each). */
enum policy { P_IGNORE, P_ACCEPT, P_PREFER, P_REQUIRE, P_DONT };

/* Configuration information from the config file... */
struct client_config {
	/*
	 * When a message has been received, run these statements
	 * over it.
	 */
	struct group *on_receipt;

	/*
	 * When a message is sent, run these statements.
	 */
	struct group *on_transmission;

	u_int32_t *required_options; /* Options server must supply. */
	u_int32_t *requested_options; /* Options to request from server. */

	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. */
	u_int32_t requested_lease;	/* Requested lease time, if user
					   doesn't configure one. */
	struct string_list *media;	/* Possible network media values. */
	char *script_name;		/* Name of config script. */
	char *vendor_space_name;	/* Name of config script. */
	enum policy bootp_policy;
					/* Ignore, accept or prefer BOOTP
					   responses. */
	enum policy auth_policy;
					/* Require authentication, prefer
					   authentication, or don't try to
					   authenticate. */
	struct string_list *medium;	/* Current network medium. */

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

	int omapi_port;			/* port on which to accept OMAPI
					   connections, or -1 for no
					   listener. */
	int do_forward_update;		/* If nonzero, and if we have the
					   information we need, update the
					   A record for the address we get. */
};

/* Per-interface state used in the dhcp client... */
struct client_state {
	struct client_state *next;
	struct interface_info *interface;
	char *name;

	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? */
	int dns_update_timeout;		 /* Last timeout set for DNS update. */
	struct string_list *medium;		   /* Last media type tried. */
	struct dhcp_packet packet;		    /* Outgoing DHCP packet. */
	unsigned packet_length;	       /* Actual length of generated packet. */

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

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

	struct option_state *sent_options;	/* Options we sent. */
};

/* Information about each network interface. */

struct interface_info {