96 lines
3.5 KiB
C
96 lines
3.5 KiB
C
/* dhcp.h - general DHCP protocol handling
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*
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* Copyright (c) 2004-2011 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef NDHC_DHCP_H_
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#define NDHC_DHCP_H_
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include "config.h"
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#define DHCP_SERVER_PORT 67
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#define DHCP_CLIENT_PORT 68
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#define DHCP_MAGIC 0x63825363
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enum {
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DHCPDISCOVER = 1,
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DHCPOFFER = 2,
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DHCPREQUEST = 3,
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DHCPDECLINE = 4,
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DHCPACK = 5,
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DHCPNAK = 6,
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DHCPRELEASE = 7,
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DHCPINFORM = 8
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};
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struct dhcpmsg {
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uint8_t op; // Message type: 1 = BOOTREQUEST for clients.
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uint8_t htype; // ARP HW address type: always '1' for ethernet.
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uint8_t hlen; // Hardware address length: always '6' for ethernet.
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uint8_t hops; // Client sets to zero.
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uint32_t xid; // Transaction ID: random number identifying session
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uint16_t secs; // Filled by client: seconds since client began address
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// aquisition or renewal process.
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uint16_t flags; // DHCP flags
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uint32_t ciaddr; // Client IP: only filled in if client is in BOUND, RENEW,
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// or REBINDING and can reply to ARP requests
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uint32_t yiaddr; // 'your' (client) IP address
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uint32_t siaddr; // Always zero -- unused.
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uint32_t giaddr; // Always zero -- unused.
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uint8_t chaddr[16]; // Client MAC address
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uint8_t sname[64]; // More DHCP options (#3)
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uint8_t file[128]; // More DHCP options (#2)
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uint32_t cookie; // Magic number cookie that starts DHCP options
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uint8_t options[308]; // DHCP options field (#1)
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};
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struct ip_udp_dhcp_packet {
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struct iphdr ip;
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struct udphdr udp;
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struct dhcpmsg data;
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};
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struct udp_dhcp_packet {
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struct udphdr udp;
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struct dhcpmsg data;
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};
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void set_listen_raw(struct client_state_t *cs);
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void set_listen_cooked(struct client_state_t *cs);
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void set_listen_none(struct client_state_t *cs);
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void handle_packet(struct client_state_t *cs);
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int send_discover(struct client_state_t *cs);
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int send_selecting(struct client_state_t *cs);
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int send_renew(struct client_state_t *cs);
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int send_rebind(struct client_state_t *cs);
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int send_decline(struct client_state_t *cs, uint32_t server);
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int send_release(struct client_state_t *cs);
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#endif
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