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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 \ No newline at end of file