dhcp-option.c

this is sample about DHCP-agent

/* $Header: /cvsroot/dhcp-agent/dhcp-agent/src/dhcp-option.c,v 1.6 2003/06/27 03:16:27 actmodern Exp $
 * 
 * Copyright 2002, 2003 Thamer Alharbash <[e-mail]>
 * 
 * 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. The names of the authors may not be used to endorse or promote
 * products derived from this software without specific prior
 * written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#define MODULE_NAME "dhcp-option"

#include "dhcp-local.h"
#include "dhcp-libutil.h"
#include "dhcp-librawnet.h"

#include "dhcp-option.h"
#include "dhcp-option-convert.h"

#include "dhcp-limits.h"

/* forward declaration of option destructors. */

static void dhcp_opt_destroy_string(dhcp_opt_t *opt);
static void dhcp_opt_destroy_array(dhcp_opt_t *opt);
static void dhcp_opt_destroy_atom(dhcp_opt_t *opt);
static void dhcp_opt_destroy_list(dhcp_opt_t *opt);

dhcp_opt_attr_t dhcp_opt_attr[] = {

    /* Pad: we never actually handle this here. so sit all handlers to NULL. */
    { TAG_DHCP_PAD,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      NULL,
      NULL,
      NULL,
      NULL, 
      NULL,
      NULL,
      dhcp_opt_destroy_atom,
    },

    /* Subnet Mask */
    { TAG_DHCP_SUBNET_MASK,
      IP_ADDR_LEN,
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_ip_addr,
      dhcp_opt_to_user_string_ip_addr,
      dhcp_opt_to_internal_string_ip_addr,
      dhcp_opt_from_network_ip_addr,
      dhcp_opt_from_user_string_ip_addr,
      dhcp_opt_from_internal_string_ip_addr,
      dhcp_opt_destroy_atom,
    },

    /* Time Offset Option */
    { TAG_DHCP_TIME_OFFSET,
      sizeof(int32_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_INT32,
      dhcp_opt_to_network_int32,
      dhcp_opt_to_user_string_int32,
      dhcp_opt_to_internal_string_int32,
      dhcp_opt_from_network_int32,
      dhcp_opt_from_user_string_int32,
      dhcp_opt_from_internal_string_int32,
      dhcp_opt_destroy_atom,
    },

    /* Router Option */
    { TAG_DHCP_ROUTER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Time Servers Option */
    { TAG_DHCP_TIME_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Name Servers Option */
    { TAG_DHCP_NAME_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Domain Name Servers Option */
    { TAG_DHCP_DOMAIN_NAME_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Log Servers Option */
    { TAG_DHCP_LOG_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Cookie Servers Option */
    { TAG_DHCP_COOKIE_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* LPR Servers Option */
    { TAG_DHCP_LPR_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Impress Servers Option */
    { TAG_DHCP_IMPRESS_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Resource Location Servers Option */
    { TAG_DHCP_RESOURCE_LOCATION_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_list_ip_addr,
      dhcp_opt_to_user_string_list_ip_addr,
      dhcp_opt_to_internal_string_list_ip_addr,
      dhcp_opt_from_network_list_ip_addr,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Host name Option */
    { TAG_DHCP_HOST_NAME,
      sizeof(int8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_INT8,
      dhcp_opt_to_network_nvt_string,
      dhcp_opt_to_user_string_nvt_string,
      dhcp_opt_to_internal_string_nvt_string,
      dhcp_opt_from_network_nvt_string, /* FIXME: see RFC 1035 for character set restriction. */
      dhcp_opt_from_user_string_nvt_string,
      dhcp_opt_from_internal_string_nvt_string,
      dhcp_opt_destroy_string,
    },

    /* Boot File Size Option. */
    { TAG_DHCP_BOOT_FILE_SIZE,
      sizeof(uint16_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT16,
      dhcp_opt_to_network_int16,
      dhcp_opt_to_user_string_int16,
      dhcp_opt_to_internal_string_int16,
      dhcp_opt_from_network_int16,
      dhcp_opt_from_user_string_int16,
      dhcp_opt_from_internal_string_int16,
      dhcp_opt_destroy_atom,
    },

    /* Merit Dump File Option. */
    { TAG_DHCP_MERIT_DUMP_FILE,
      sizeof(int8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_INT8,
      dhcp_opt_to_network_nvt_string,
      dhcp_opt_to_user_string_nvt_string,
      dhcp_opt_to_internal_string_nvt_string,
      dhcp_opt_from_network_nvt_string,
      dhcp_opt_from_user_string_nvt_string,
      dhcp_opt_from_internal_string_nvt_string,
      dhcp_opt_destroy_string,
    },

    /* Domain Name Option. */
    { TAG_DHCP_DOMAIN_NAME,
      sizeof(int8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_INT8,
      dhcp_opt_to_network_string,
      dhcp_opt_to_user_string_string,
      dhcp_opt_to_internal_string_string,
      dhcp_opt_from_network_string,
      dhcp_opt_from_user_string_string,
      dhcp_opt_from_internal_string_string,
      dhcp_opt_destroy_string,
    },

    /* Swap Server Option */
    { TAG_DHCP_SWAP_SERVER,
      IP_ADDR_LEN,
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_ip_addr,
      dhcp_opt_to_user_string_ip_addr,
      dhcp_opt_to_internal_string_ip_addr,
      dhcp_opt_from_network_ip_addr,
      dhcp_opt_from_user_string_ip_addr,
      dhcp_opt_from_internal_string_ip_addr,
      dhcp_opt_destroy_atom,
    },

    /* Root Path Option */
    { TAG_DHCP_ROOT_PATH,
      sizeof(int8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_INT8,
      dhcp_opt_to_network_nvt_string,
      dhcp_opt_to_user_string_nvt_string,
      dhcp_opt_to_internal_string_nvt_string,
      dhcp_opt_from_network_nvt_string,
      dhcp_opt_from_user_string_nvt_string,
      dhcp_opt_from_internal_string_nvt_string,
      dhcp_opt_destroy_string,
    },

    /* Extensions Path Option */
    { TAG_DHCP_EXTENSIONS_PATH,
      sizeof(int8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_INT8,
      dhcp_opt_to_network_string,
      dhcp_opt_to_user_string_string,
      dhcp_opt_to_internal_string_string,
      dhcp_opt_from_network_string,
      dhcp_opt_from_user_string_string,
      dhcp_opt_from_internal_string_string,
      dhcp_opt_destroy_string,
    },

    /* IP Forwarding Option */
    { TAG_DHCP_IP_FORWARDING,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Non Local Source Routing Option */
    { TAG_DHCP_NON_LOCAL_SOURCE_ROUTING,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Policy Filter Option */
    { TAG_DHCP_POLICY_FILTER,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS_PAIR,
      dhcp_opt_to_network_ip_addr_pair,
      dhcp_opt_to_user_string_ip_addr_pair,
      dhcp_opt_to_internal_string_ip_addr_pair,      
      dhcp_opt_from_network_list_ip_addr_pair,
      dhcp_opt_from_user_string_list_ip_addr,
      dhcp_opt_from_internal_string_list_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* Maximum Datagram Reassembly Size Option */
    { TAG_DHCP_MAX_DGRAM_REASSUMBLY_SIZE,
      sizeof(uint16_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT16,
      dhcp_opt_to_network_uint16,
      dhcp_opt_to_user_string_uint16,
      dhcp_opt_to_internal_string_uint16,
      dhcp_opt_from_network_uint16,
      dhcp_opt_from_user_string_uint16,
      dhcp_opt_from_internal_string_uint16,
      dhcp_opt_destroy_atom,
    },

    /* Default IP Time-to-Live Option */
    { TAG_DHCP_IP_TIME_TO_LIVE,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Path MTU Aging Timeout Option */
    { TAG_DHCP_MTU_AGING_TIMEOUT,
      sizeof(uint32_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT32,
      dhcp_opt_to_network_uint32,
      dhcp_opt_to_user_string_uint32,
      dhcp_opt_to_internal_string_uint32,
      dhcp_opt_from_network_uint32,
      dhcp_opt_from_user_string_uint32,
      dhcp_opt_from_internal_string_uint32,
      dhcp_opt_destroy_atom,
    },

    /* Path MTU Plateau Table Option */
    { TAG_DHCP_MTU_PLATEAU_TABLE,
      sizeof(uint16_t),
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_UINT16,
      dhcp_opt_to_network_uint16,
      dhcp_opt_to_user_string_uint16,
      dhcp_opt_to_internal_string_uint16,
      dhcp_opt_from_network_list_uint16,
      dhcp_opt_from_user_string_uint16,
      dhcp_opt_from_internal_string_uint16,
      dhcp_opt_destroy_list,
    },

    /* Interface MTU Option */
    { TAG_DHCP_INTERFACE_MTU,
      sizeof(uint16_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT16,
      dhcp_opt_to_network_uint16,
      dhcp_opt_to_user_string_uint16,
      dhcp_opt_to_internal_string_uint16,
      dhcp_opt_from_network_uint16,
      dhcp_opt_from_user_string_uint16,
      dhcp_opt_from_internal_string_uint16,
      dhcp_opt_destroy_atom,
    },

    /* Subnets Are Local Option */
    { TAG_DHCP_SUBNETS_ARE_LOCAL,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Broadcast Address Option */
    { TAG_DHCP_BROADCAST_ADDRESS,
      IP_ADDR_LEN,
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_ip_addr,
      dhcp_opt_to_user_string_ip_addr,
      dhcp_opt_to_internal_string_ip_addr,
      dhcp_opt_from_network_ip_addr,
      dhcp_opt_from_user_string_ip_addr,
      dhcp_opt_from_internal_string_ip_addr,
      dhcp_opt_destroy_atom,
    },

    /* Perform Mask Discovery Option */
    { TAG_DHCP_MASK_DISCOVERY,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Mask Supplier */
    { TAG_DHCP_MASK_SUPPLIER,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Perform Router Discovery */
    { TAG_DHCP_ROUTER_DISCOVERY,
      sizeof(uint8_t),
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_uint8,
      dhcp_opt_to_user_string_uint8,
      dhcp_opt_to_internal_string_uint8,
      dhcp_opt_from_network_uint8,
      dhcp_opt_from_user_string_uint8,
      dhcp_opt_from_internal_string_uint8,
      dhcp_opt_destroy_atom,
    },

    /* Router Solicitation Address Option */
    { TAG_DHCP_ROUTER_SOLICITATION,
      IP_ADDR_LEN,
      DHCP_OPT_ATOM,
      DHCP_OPT_VAL_ADDRESS,
      dhcp_opt_to_network_ip_addr,
      dhcp_opt_to_user_string_ip_addr,
      dhcp_opt_to_internal_string_ip_addr,