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/**
* Copyright (C) 2012 Steven Barth <steven@midlink.org>
* Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*
*/
#pragma once
#define DHCPV4_CLIENT_PORT 68
#define DHCPV4_SERVER_PORT 67
#define DHCPV4_FLAG_BROADCAST 0x8000
#define DHCPV4_MIN_PACKET_SIZE 300
enum dhcpv4_op {
DHCPV4_BOOTREQUEST = 1,
DHCPV4_BOOTREPLY = 2
};
enum dhcpv4_msg {
DHCPV4_MSG_DISCOVER = 1,
DHCPV4_MSG_OFFER = 2,
DHCPV4_MSG_REQUEST = 3,
DHCPV4_MSG_DECLINE = 4,
DHCPV4_MSG_ACK = 5,
DHCPV4_MSG_NAK = 6,
DHCPV4_MSG_RELEASE = 7,
DHCPV4_MSG_INFORM = 8,
DHCPV4_MSG_FORCERENEW = 9,
};
enum dhcpv4_opt {
DHCPV4_OPT_PAD = 0,
DHCPV4_OPT_NETMASK = 1,
DHCPV4_OPT_ROUTER = 3,
DHCPV4_OPT_DNSSERVER = 6,
DHCPV4_OPT_DOMAIN = 15,
DHCPV4_OPT_MTU = 26,
DHCPV4_OPT_BROADCAST = 28,
DHCPV4_OPT_NTPSERVER = 42,
DHCPV4_OPT_LEASETIME = 51,
DHCPV4_OPT_MESSAGE = 53,
DHCPV4_OPT_SERVERID = 54,
DHCPV4_OPT_REQOPTS = 55,
DHCPV4_OPT_RENEW = 58,
DHCPV4_OPT_REBIND = 59,
DHCPV4_OPT_IPADDRESS = 50,
DHCPV4_OPT_HOSTNAME = 12,
DHCPV4_OPT_REQUEST = 17,
DHCPV4_OPT_USER_CLASS = 77,
DHCPV4_OPT_AUTHENTICATION = 90,
DHCPV4_OPT_SEARCH_DOMAIN = 119,
DHCPV4_OPT_FORCERENEW_NONCE_CAPABLE = 145,
DHCPV4_OPT_END = 255,
};
struct dhcpv4_message {
uint8_t op;
uint8_t htype;
uint8_t hlen;
uint8_t hops;
uint32_t xid;
uint16_t secs;
uint16_t flags;
struct in_addr ciaddr;
struct in_addr yiaddr;
struct in_addr siaddr;
struct in_addr giaddr;
uint8_t chaddr[16];
char sname[64];
char file[128];
uint8_t options[312];
};
struct dhcpv4_auth_forcerenew {
uint8_t protocol;
uint8_t algorithm;
uint8_t rdm;
uint32_t replay[2];
uint8_t type;
uint8_t key[16];
} _packed;
struct dhcpv4_option {
uint8_t type;
uint8_t len;
uint8_t data[];
};
#define dhcpv4_for_each_option(start, end, opt)\
for (opt = (struct dhcpv4_option*)(start); \
&opt[1] <= (struct dhcpv4_option*)(end) && \
&opt->data[opt->len] <= (end); \
opt = (struct dhcpv4_option*)&opt->data[opt->len])
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