dhcp_options.h   [plain text]

#ifndef _NETINET_DHCP_OPTIONS_H
#define _NETINET_DHCP_OPTIONS_H
#include <sys/appleapiopts.h>
/*
 * Copyright (c) 1999-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*
 * dhcp_options.h
 * - routines to parse and access dhcp options
 */

/*
 * Modification History
 *
 * March 15, 2002	Dieter Siegmund (dieter@apple)
 * - imported from bootp project
 */
#include <mach/boolean.h>
#include <netinet/dhcp.h>


/* overloaded option values */
#define DHCP_OVERLOAD_FILE	1
#define DHCP_OVERLOAD_SNAME	2
#define DHCP_OVERLOAD_BOTH	3

/*
 * DHCP_OPTION_SIZE_MAX
 * - the largest size that an option can be (limited to an 8-bit quantity)
 */
#define DHCP_OPTION_SIZE_MAX	255

#define DHCP_TAG_OFFSET		0
#define DHCP_LEN_OFFSET		1
#define DHCP_OPTION_OFFSET	2



#define RFC_OPTIONS_MAGIC		{ 99, 130, 83, 99 }
#define RFC_MAGIC_SIZE			4 /* bytes */

enum {
    /* rfc 1497 vendor extensions: 0..18, 255 */
    dhcptag_pad_e                      	= 0,
    dhcptag_end_e                      	= 255,
    dhcptag_subnet_mask_e              	= 1,
    dhcptag_time_offset_e              	= 2,
    dhcptag_router_e                   	= 3,
    dhcptag_time_server_e              	= 4,
    dhcptag_name_server_e              	= 5,
    dhcptag_domain_name_server_e       	= 6,
    dhcptag_log_server_e               	= 7,
    dhcptag_cookie_server_e            	= 8,
    dhcptag_lpr_server_e               	= 9,
    dhcptag_impress_server_e           	= 10,
    dhcptag_resource_location_server_e 	= 11,
    dhcptag_host_name_e                	= 12,
    dhcptag_boot_file_size_e           	= 13,
    dhcptag_merit_dump_file_e          	= 14,
    dhcptag_domain_name_e              	= 15,
    dhcptag_swap_server_e              	= 16,
    dhcptag_root_path_e                	= 17,
    dhcptag_extensions_path_e          	= 18,

    /* ip layer parameters per host: 19..25 */
    dhcptag_ip_forwarding_e            	= 19,
    dhcptag_non_local_source_routing_e 	= 20,
    dhcptag_policy_filter_e            	= 21,
    dhcptag_max_dgram_reassembly_size_e	= 22,
    dhcptag_default_ip_time_to_live_e  	= 23,
    dhcptag_path_mtu_aging_timeout_e   	= 24,
    dhcptag_path_mtu_plateau_table_e   	= 25,

    /* ip layer parameters per interface: 26..33 */
    dhcptag_interface_mtu_e            	= 26,
    dhcptag_all_subnets_local_e        	= 27,
    dhcptag_broadcast_address_e        	= 28,
    dhcptag_perform_mask_discovery_e   	= 29,
    dhcptag_mask_supplier_e            	= 30,
    dhcptag_perform_router_discovery_e 	= 31,
    dhcptag_router_solicitation_address_e	= 32,
    dhcptag_static_route_e             	= 33,
    dhcptag_trailer_encapsulation_e    	= 34,
    dhcptag_arp_cache_timeout_e        	= 35,
    dhcptag_ethernet_encapsulation_e   	= 36,

    /* tcp parameters: 37..39 */
    dhcptag_default_ttl_e              	= 37,
    dhcptag_keepalive_interval_e       	= 38,
    dhcptag_keepalive_garbage_e        	= 39,

    /* application & service parameters: 40..49, 64, 65, 68..76, 78, 79, 95 */
    dhcptag_nis_domain_e               	= 40,
    dhcptag_nis_servers_e              	= 41,
    dhcptag_network_time_protocol_servers_e	= 42,
    dhcptag_vendor_specific_e          	= 43,
    dhcptag_nb_over_tcpip_name_server_e	= 44,
    dhcptag_nb_over_tcpip_dgram_dist_server_e	= 45,
    dhcptag_nb_over_tcpip_node_type_e  	= 46,
    dhcptag_nb_over_tcpip_scope_e      	= 47,
    dhcptag_x_windows_font_server_e    	= 48,
    dhcptag_x_windows_display_manager_e	= 49,
    dhcptag_nis_plus_domain_e          	= 64,
    dhcptag_nis_plus_servers_e         	= 65,
    dhcptag_mobile_ip_home_agent_e     	= 68,
    dhcptag_smtp_server_e              	= 69,
    dhcptag_pop3_server_e              	= 70,
    dhcptag_nntp_server_e              	= 71,
    dhcptag_default_www_server_e       	= 72,
    dhcptag_default_finger_server_e    	= 73,
    dhcptag_default_irc_server_e       	= 74,
    dhcptag_streettalk_server_e        	= 75,
    dhcptag_stda_server_e              	= 76,
    dhcptag_slp_directory_agent_e      	= 78,
    dhcptag_slp_service_scope_e        	= 79,
    dhcptag_ldap_url_e                 	= 95,

    /* dhcp-specific extensions: 50..61, 66, 67 */
    dhcptag_requested_ip_address_e     	= 50,
    dhcptag_lease_time_e               	= 51,
    dhcptag_option_overload_e          	= 52,
    dhcptag_dhcp_message_type_e        	= 53,
    dhcptag_server_identifier_e        	= 54,
    dhcptag_parameter_request_list_e   	= 55,
    dhcptag_message_e                  	= 56,
    dhcptag_max_dhcp_message_size_e    	= 57,
    dhcptag_renewal_t1_time_value_e    	= 58,
    dhcptag_rebinding_t2_time_value_e  	= 59,
    dhcptag_vendor_class_identifier_e  	= 60,
    dhcptag_client_identifier_e        	= 61,
    dhcptag_tftp_server_name_e         	= 66,
    dhcptag_bootfile_name_e            	= 67,

    /* netinfo parent tags: 112, 113 */
    dhcptag_netinfo_server_address_e   	= 112,
    dhcptag_netinfo_server_tag_e       	= 113,

    /* ad-hoc network disable option */
    dhcptag_auto_configure_e           	= 116,
};
typedef uint8_t dhcptag_t; 

/*
 * Module: dhcpol (dhcp options list)
 *
 * Purpose:
 *   Routines to parse and retrieve dhcp options.
 */

typedef struct {
    const void * *	array;	/* malloc'd array of pointers */
    int			size;	/* number of elements in array */
    int			count;	/* number of occupied elements */
} ptrlist_t;

typedef ptrlist_t dhcpol_t;

#ifdef KERNEL_PRIVATE

void			dhcpol_init(dhcpol_t * list);
void			dhcpol_free(dhcpol_t * list);
int			dhcpol_count(dhcpol_t * list);
boolean_t		dhcpol_add(dhcpol_t * list, const void * element);
const void *		dhcpol_element(dhcpol_t * list, int i);
boolean_t		dhcpol_concat(dhcpol_t * list, dhcpol_t * extra);
boolean_t		dhcpol_parse_buffer(dhcpol_t * list,
					    const void * buffer, 
					    int length);
const void *		dhcpol_find(dhcpol_t * list, int tag, int * len_p, 
				    int * start);
#if 0
void *			dhcpol_get(dhcpol_t * list, int tag, int * len_p);
#endif
boolean_t		dhcpol_parse_packet(dhcpol_t * options, 
					    const struct dhcp * pkt, int len);
void			dhcpol_print(dhcpol_t * list);
/*
 * Module: dhcpoa (dhcp options area)
 *
 * Purpose:
 *   Types and functions to create new dhcp option areas.
 */

/*
 * Struct: dhcpoa_s
 * Purpose:
 *   To record information about a dhcp option data area.
 */
struct dhcpoa_s {
    uint8_t *	oa_buffer;	/* data area to hold options */
    int		oa_size;	/* size of buffer */
    int		oa_offset;	/* offset of next option to write */
    int		oa_end_tag;	/* to mark when options are terminated */
    int		oa_option_count;/* number of options present */
    int		oa_reserve; 	/* space to reserve, either 0 or 1 */
};

/*
 * Type: dhcpoa_t
 *
 * Purpose:
 *   To record information about a dhcp option data area.
 */
typedef struct dhcpoa_s dhcpoa_t;

/* 
 * Type:dhcpoa_ret_t
 *
 * Purpose:
 *  outine return codes 
 */
typedef enum {
    dhcpoa_success_e = 0,
    dhcpoa_failed_e,
    dhcpoa_full_e,
} dhcpoa_ret_t;

void
dhcpoa_init(dhcpoa_t * opt, void * buffer, int size);

void
dhcpoa_init_no_end(dhcpoa_t * opt, void * buffer, int size);

dhcpoa_ret_t
dhcpoa_add(dhcpoa_t * oa_p, dhcptag_t tag, int len, const void * data);

dhcpoa_ret_t
dhcpoa_add_dhcpmsg(dhcpoa_t * oa_p, dhcp_msgtype_t msgtype);

#if 0
dhcpoa_ret_t
dhcpoa_vendor_add(dhcpoa_t * oa_p, dhcpoa_t * vendor_oa_p,
		  dhcptag_t tag, int len, void * option);
#endif

int
dhcpoa_used(dhcpoa_t * oa_p);

int
dhcpoa_count(dhcpoa_t * oa_p);

void *
dhcpoa_buffer(dhcpoa_t * oa_p);

int
dhcpoa_freespace(dhcpoa_t * oa_p);

int
dhcpoa_size(dhcpoa_t * oa_p);

#endif /* KERNEL_PRIVATE */
#endif /* _NETINET_DHCP_OPTIONS_H */