dhcp-option.c

this is sample about DHCP-agent

      dhcp_opt_from_network_ip_addr,
      dhcp_opt_from_user_string_ip_addr,
      dhcp_opt_from_internal_string_ip_addr,
      dhcp_opt_destroy_atom,
    },

    /* Static Route Option */
    { TAG_DHCP_STATIC_ROUTE,
      IP_ADDR_LEN,
      DHCP_OPT_LIST,
      DHCP_OPT_VAL_ADDRESS_PAIR,
      dhcp_opt_to_network_list_ip_addr_pair,
      dhcp_opt_to_user_string_list_ip_addr_pair,
      dhcp_opt_to_internal_string_list_ip_addr_pair,
      dhcp_opt_from_network_list_ip_addr_pair,
      dhcp_opt_from_user_string_ip_addr_pair,
      dhcp_opt_from_internal_string_list_ip_addr_pair,
      dhcp_opt_destroy_list,
    },

    /* Trailer Encapsulation Option */
    { TAG_DHCP_TRAILER_ENCAPSULATION,
      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,
    },

    /* Arp Cache Timeout */
    { TAG_DHCP_ARP_CACHE_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,
    },

    /* Ethernet Encapsulation */
    { TAG_DHCP_ETHERNET_ENCAPSULATION,
      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,
    },

    /* TCP Default TTL */
    { TAG_DHCP_TCP_DEFAULT_TTL,
      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,
    },

    /* TCP Keep Alive Interval */
    { TAG_DHCP_TCP_KEEPALIVE_INTERVAL,
      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,
    },

    /* Keep Alive Garbage */
    { TAG_DHCP_TCP_KEEPALIVE_GARBAGE,
      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,
    },

    /* NIS Domain */
    { TAG_DHCP_NIS_DOMAIN_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,
      dhcp_opt_from_user_string_nvt_string,
      dhcp_opt_from_internal_string_nvt_string,
      dhcp_opt_destroy_string,
    },

    /* NIS Servers */
    { TAG_DHCP_NIS_SERVERS,
      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_ip_addr,
      dhcp_opt_destroy_list,
    },

    /* NTP Servers */
    { TAG_DHCP_NTP_SERVERS,
      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,
    },

    /* FIXME: this needs to be handled specially.  we actually
     * don't because for the time being we don't support any
     * vendor specific information. Good place to drop our own
     * home rolled options if we want. */

    /* Vendor Specific Information */
    { TAG_DHCP_VENDOR_SPECIFIC,
      sizeof(uint8_t),
      DHCP_OPT_ARRAY,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_array_uint8,
      dhcp_opt_to_user_string_array_uint8,
      dhcp_opt_to_internal_string_array_uint8,
      dhcp_opt_from_network_array_uint8,
      dhcp_opt_from_user_string_array_uint8,
      dhcp_opt_from_internal_string_array_uint8,
      dhcp_opt_destroy_array,
    },

    /* NetBIOS Name Server */
    { TAG_DHCP_NETBIOSOTCP_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,
    },

    /* NetBIOS Datagram Distribution Server */
    { TAG_DHCP_NETBIOSOTCP_DATAGRAM_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,
    },

    /* NetBIOS Datagram Node Type */
    { TAG_DHCP_NETBIOSOTCP_NODE_TYPE,
      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,
    },

    /* NetBIOS Scope Option */
    { TAG_DHCP_NETBIOSOTCP_SCOPE,
      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_atom,
    },

    /* X-Windows Font Server */
    { TAG_DHCP_XWIN_FONT_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,
    },

    /* X-Windows Display Manager Server */
    { TAG_DHCP_XWIN_DISP_MANAGER_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,
    },

    /* Requested IP Address */
    { TAG_DHCP_REQUESTED_IP_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,
    },

    /* IP Address Lease Time */
    { TAG_DHCP_IP_ADDRESS_LEASE_TIME,
      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,
    },

    /* Option Overload */
    { TAG_DHCP_OVERLOAD,
      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,
    },

    /* Message Type */
    { TAG_DHCP_MESSAGE_TYPE,
      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,
    },

    /* Server Identifier */
    { TAG_DHCP_SERVER_IDENTIFIER,
      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,
    },

    /* FIXME: make a type for this. */
    /* Parameter Request List */
    { TAG_DHCP_PARAMETERS,
      sizeof(uint8_t),
      DHCP_OPT_ARRAY,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_array_uint8,
      dhcp_opt_to_user_string_array_uint8,
      dhcp_opt_to_internal_string_array_uint8,
      dhcp_opt_from_network_array_uint8,
      dhcp_opt_from_user_string_array_uint8,
      dhcp_opt_from_internal_string_array_uint8,
      dhcp_opt_destroy_array,
    },

    /* Message */
    { TAG_DHCP_MESSAGE,
      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_array,
    },

    /* Maximum DHCP Message Size */
    { TAG_DHCP_MAX_DHCP_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,
    },

    /* Renewal Time */
    { TAG_DHCP_RENEWAL_TIME,
      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,
    },

    /* Rebinding Time */
    { TAG_DHCP_REBINDING_TIME,
      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,
    },

    /* Vendor class identifier */
    { TAG_DHCP_VENDOR_CLASS_ID,
      sizeof(uint8_t),
      DHCP_OPT_STRING,
      DHCP_OPT_VAL_UINT8,
      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_atom,
    },

    /* Client ID */
    { TAG_DHCP_CLIENT_ID,
      sizeof(uint8_t),
      DHCP_OPT_ARRAY,
      DHCP_OPT_VAL_UINT8,
      dhcp_opt_to_network_array_uint8,
      dhcp_opt_to_user_string_array_uint8,
      dhcp_opt_to_internal_string_array_uint8,
      dhcp_opt_from_network_array_uint8,
      dhcp_opt_from_user_string_array_uint8,
      dhcp_opt_from_internal_string_array_uint8,
      dhcp_opt_destroy_array,
    },

    /* NIS+ Domain */
    { TAG_DHCP_NISPLUS_DOMAIN,
      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_atom,
    },

    /* NIS+ Servers */
    { TAG_DHCP_NISPLUS_SERVERS,
      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,
    },

    /* Mobile IP Home Agent */
    { TAG_DHCP_NISPLUS_SERVERS,
      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,
    },

    /* TFTP Server Name Option */
    { TAG_DHCP_TFTP_SERVER,
      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,
    },

    /* Boot File Name Option */
    { TAG_DHCP_BOOT_FILE_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,
    },

    /* FIXME: this option can be legally set to 0
     * we need to handle it that way. */

    /* IP Home Agent Option */
    { TAG_DHCP_IP_HOME_AGENT,
      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,