dhcp.h

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/* dhcp.h

   Protocol structures... */

/*
 * Copyright (c) 1995-2001 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 in cooperation with Vixie Enterprises.  To learn more
 * about the Internet Software Consortium, see ``http://www.isc.org''.
 * To learn more about Vixie Enterprises, see ``http://www.vix.com''.
 */

#ifndef DHCP_H
#define DHCP_H


#define DHCP_UDP_OVERHEAD       (14 + /* Ethernet header */             \
                                 20 + /* IP header */                   \
                                 8)   /* UDP header */
#define DHCP_SNAME_LEN          64
#define DHCP_FILE_LEN           128
#define DHCP_FIXED_NON_UDP      236
#define DHCP_FIXED_LEN          (DHCP_FIXED_NON_UDP + DHCP_UDP_OVERHEAD)
                                                /* Everything but options. */
#define DHCP_MTU_MAX            1500
#define DHCP_OPTION_LEN         (DHCP_MTU_MAX - DHCP_FIXED_LEN)

#define BOOTP_MIN_LEN           300
#define DHCP_MIN_LEN            548

struct dhcp_packet {
        u_int8_t  op;           /* 0: Message opcode/type */
        u_int8_t  htype;        /* 1: Hardware addr type (net/if_types.h) */
        u_int8_t  hlen;         /* 2: Hardware addr length */
        u_int8_t  hops;         /* 3: Number of relay agent hops from client */
        u_int32_t xid;          /* 4: Transaction ID */
        u_int16_t secs;         /* 8: Seconds since client started looking */
        u_int16_t flags;        /* 10: Flag bits */
        struct in_addr ciaddr;  /* 12: Client IP address (if already in use) */
        struct in_addr yiaddr;  /* 16: Client IP address */
        struct in_addr siaddr;  /* 18: IP address of next server to talk to */
        struct in_addr giaddr;  /* 20: DHCP relay agent IP address */
        unsigned char chaddr [16];      /* 24: Client hardware address */
        char sname [DHCP_SNAME_LEN];    /* 40: Server name */
        char file [DHCP_FILE_LEN];      /* 104: Boot filename */
        unsigned char options [DHCP_OPTION_LEN];
                                /* 212: Optional parameters
                                   (actual length dependent on MTU). */
};

/* BOOTP (rfc951) message types */
#define BOOTREQUEST     1
#define BOOTREPLY       2

/* Possible values for flags field... */
#define BOOTP_BROADCAST 32768L

/* Possible values for hardware type (htype) field... */
#define HTYPE_ETHER     1               /* Ethernet 10Mbps              */
#define HTYPE_IEEE802   6               /* IEEE 802.2 Token Ring...     */
#define HTYPE_FDDI      8               /* FDDI...                      */

/* Magic cookie validating dhcp options field (and bootp vendor
   extensions field). */
#define DHCP_OPTIONS_COOKIE     "\143\202\123\143"

/* DHCP Option codes: */

#define DHO_PAD                         0
#define DHO_SUBNET_MASK                 1
#define DHO_TIME_OFFSET                 2
#define DHO_ROUTERS                     3
#define DHO_TIME_SERVERS                4
#define DHO_NAME_SERVERS                5
#define DHO_DOMAIN_NAME_SERVERS         6
#define DHO_LOG_SERVERS                 7
#define DHO_COOKIE_SERVERS              8
#define DHO_LPR_SERVERS                 9
#define DHO_IMPRESS_SERVERS             10
#define DHO_RESOURCE_LOCATION_SERVERS   11
#define DHO_HOST_NAME                   12
#define DHO_BOOT_SIZE                   13
#define DHO_MERIT_DUMP                  14
#define DHO_DOMAIN_NAME                 15
#define DHO_SWAP_SERVER                 16
#define DHO_ROOT_PATH                   17
#define DHO_EXTENSIONS_PATH             18
#define DHO_IP_FORWARDING               19
#define DHO_NON_LOCAL_SOURCE_ROUTING    20
#define DHO_POLICY_FILTER               21
#define DHO_MAX_DGRAM_REASSEMBLY        22
#define DHO_DEFAULT_IP_TTL              23
#define DHO_PATH_MTU_AGING_TIMEOUT      24
#define DHO_PATH_MTU_PLATEAU_TABLE      25
#define DHO_INTERFACE_MTU               26
#define DHO_ALL_SUBNETS_LOCAL           27
#define DHO_BROADCAST_ADDRESS           28
#define DHO_PERFORM_MASK_DISCOVERY      29
#define DHO_MASK_SUPPLIER               30
#define DHO_ROUTER_DISCOVERY            31
#define DHO_ROUTER_SOLICITATION_ADDRESS 32
#define DHO_STATIC_ROUTES               33
#define DHO_TRAILER_ENCAPSULATION       34
#define DHO_ARP_CACHE_TIMEOUT           35
#define DHO_IEEE802_3_ENCAPSULATION     36
#define DHO_DEFAULT_TCP_TTL             37
#define DHO_TCP_KEEPALIVE_INTERVAL      38
#define DHO_TCP_KEEPALIVE_GARBAGE       39
#define DHO_NIS_DOMAIN                  40
#define DHO_NIS_SERVERS                 41
#define DHO_NTP_SERVERS                 42
#define DHO_VENDOR_ENCAPSULATED_OPTIONS 43
#define DHO_NETBIOS_NAME_SERVERS        44
#define DHO_NETBIOS_DD_SERVER           45
#define DHO_NETBIOS_NODE_TYPE           46
#define DHO_NETBIOS_SCOPE               47
#define DHO_FONT_SERVERS                48
#define DHO_X_DISPLAY_MANAGER           49
#define DHO_DHCP_REQUESTED_ADDRESS      50
#define DHO_DHCP_LEASE_TIME             51
#define DHO_DHCP_OPTION_OVERLOAD        52
#define DHO_DHCP_MESSAGE_TYPE           53
#define DHO_DHCP_SERVER_IDENTIFIER      54
#define DHO_DHCP_PARAMETER_REQUEST_LIST 55
#define DHO_DHCP_MESSAGE                56
#define DHO_DHCP_MAX_MESSAGE_SIZE       57
#define DHO_DHCP_RENEWAL_TIME           58
#define DHO_DHCP_REBINDING_TIME         59
#define DHO_VENDOR_CLASS_IDENTIFIER     60
#define DHO_DHCP_CLIENT_IDENTIFIER      61
#define DHO_NWIP_DOMAIN_NAME            62
#define DHO_NWIP_SUBOPTIONS             63
#define DHO_USER_CLASS                  77
#define DHO_FQDN                        81
#define DHO_DHCP_AGENT_OPTIONS          82
#define DHO_SUBNET_SELECTION            118 /* RFC3011! */
/* The DHO_AUTHENTICATE option is not a standard yet, so I've
   allocated an option out of the "local" option space for it on a
   temporary basis.  Once an option code number is assigned, I will
   immediately and shamelessly break this, so don't count on it
   continuing to work. */
#define DHO_AUTHENTICATE                210

#define DHO_END                         255

/* DHCP message types. */
#define DHCPDISCOVER    1
#define DHCPOFFER       2
#define DHCPREQUEST     3
#define DHCPDECLINE     4
#define DHCPACK         5
#define DHCPNAK         6
#define DHCPRELEASE     7
#define DHCPINFORM      8

/* Relay Agent Information option subtypes: */
#define RAI_CIRCUIT_ID  1
#define RAI_REMOTE_ID   2
#define RAI_AGENT_ID    3

/* FQDN suboptions: */
#define FQDN_NO_CLIENT_UPDATE           1
#define FQDN_SERVER_UPDATE              2
#define FQDN_ENCODED                    3
#define FQDN_RCODE1                     4
#define FQDN_RCODE2                     5
#define FQDN_HOSTNAME                   6
#define FQDN_DOMAINNAME                 7
#define FQDN_FQDN                       8
#define FQDN_SUBOPTION_COUNT            8


#endif

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