20b958bf15
Store a pointer to the options in the DHCPMessage struct, and pass this together with an offset around, rather than a uint8_t**. This avoids us having to (re)compute the pointer; and changes dhcp_option_append from adjusting both the pointer to the next option and the remaining size of the options, to just adjusting the current offset. This makes the code a bit simpler to follow IMHO, but there should be no functional change.
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include <stdint.h>
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#include "macro.h"
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#include "sparse-endian.h"
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struct DHCPMessage {
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uint8_t op;
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uint8_t htype;
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uint8_t hlen;
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uint8_t hops;
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be32_t xid;
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be16_t secs;
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be16_t flags;
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be32_t ciaddr;
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be32_t yiaddr;
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be32_t siaddr;
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be32_t giaddr;
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uint8_t chaddr[16];
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uint8_t sname[64];
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uint8_t file[128];
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be32_t magic;
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uint8_t options[0];
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} _packed_;
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typedef struct DHCPMessage DHCPMessage;
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struct DHCPPacket {
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struct iphdr ip;
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struct udphdr udp;
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DHCPMessage dhcp;
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} _packed_;
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typedef struct DHCPPacket DHCPPacket;
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#define DHCP_IP_SIZE (int32_t)(sizeof(struct iphdr))
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#define DHCP_IP_UDP_SIZE (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
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#define DHCP_MESSAGE_SIZE (int32_t)(sizeof(DHCPMessage))
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#define DHCP_MIN_OPTIONS_SIZE 308
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#define DHCP_MAGIC_COOKIE (uint32_t)(0x63825363)
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enum {
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DHCP_PORT_SERVER = 67,
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DHCP_PORT_CLIENT = 68,
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};
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enum DHCPState {
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DHCP_STATE_INIT = 0,
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DHCP_STATE_SELECTING = 1,
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DHCP_STATE_INIT_REBOOT = 2,
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DHCP_STATE_REBOOTING = 3,
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DHCP_STATE_REQUESTING = 4,
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DHCP_STATE_BOUND = 5,
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DHCP_STATE_RENEWING = 6,
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DHCP_STATE_REBINDING = 7,
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DHCP_STATE_STOPPED = 8,
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};
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typedef enum DHCPState DHCPState;
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enum {
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BOOTREQUEST = 1,
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BOOTREPLY = 2,
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};
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enum {
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DHCP_DISCOVER = 1,
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DHCP_OFFER = 2,
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DHCP_REQUEST = 3,
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DHCP_DECLINE = 4,
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DHCP_ACK = 5,
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DHCP_NAK = 6,
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DHCP_RELEASE = 7,
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};
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enum {
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DHCP_OVERLOAD_FILE = 1,
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DHCP_OVERLOAD_SNAME = 2,
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};
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enum {
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DHCP_OPTION_PAD = 0,
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DHCP_OPTION_SUBNET_MASK = 1,
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DHCP_OPTION_ROUTER = 3,
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DHCP_OPTION_DOMAIN_NAME_SERVER = 6,
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DHCP_OPTION_HOST_NAME = 12,
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DHCP_OPTION_DOMAIN_NAME = 15,
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DHCP_OPTION_ROOT_PATH = 17,
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DHCP_OPTION_INTERFACE_MTU = 26,
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DHCP_OPTION_NTP_SERVER = 42,
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DHCP_OPTION_REQUESTED_IP_ADDRESS = 50,
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DHCP_OPTION_IP_ADDRESS_LEASE_TIME = 51,
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DHCP_OPTION_OVERLOAD = 52,
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DHCP_OPTION_MESSAGE_TYPE = 53,
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DHCP_OPTION_SERVER_IDENTIFIER = 54,
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DHCP_OPTION_PARAMETER_REQUEST_LIST = 55,
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DHCP_OPTION_MAXIMUM_MESSAGE_SIZE = 57,
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DHCP_OPTION_RENEWAL_T1_TIME = 58,
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DHCP_OPTION_REBINDING_T2_TIME = 59,
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DHCP_OPTION_CLIENT_IDENTIFIER = 61,
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DHCP_OPTION_END = 255,
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};
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