101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
#pragma once
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#include <stdint.h>
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#include <assert.h>
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namespace dhcp4 {
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struct __attribute__((packed)) message {
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uint8_t op; // message type
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uint8_t htype; // hardware type
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uint8_t hlen; // hardware address length
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uint8_t hops;
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uint32_t xid; // transaction id
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uint16_t secs; // seconds elapsed
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uint16_t flags;
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uint32_t ciaddr; // client IP address
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uint32_t yiaddr; // your (client) IP address
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uint32_t siaddr; // next server IP address
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uint32_t giaddr; // relay agent IP address
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uint8_t chaddr[16]; // client hardware address
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uint8_t sname[64];
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uint8_t file[128];
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uint8_t options[];
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};
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struct options {
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int message_type; // 53
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uint32_t subnet_mask; // 1
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uint32_t router; // 3
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uint32_t domain_name_server; // 6
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uint32_t requested_ip_address; // 50
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};
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struct op {
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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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};
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struct htype {
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enum {
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ethernet = 1,
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};
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};
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static_assert((sizeof (message)) == 236);
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struct option {
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enum {
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subnet_mask = 1,
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router = 3,
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domain_name_server = 6,
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broadcast_address = 28,
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requested_ip_address = 50,
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ip_address_lease_time = 51,
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option_overload = 52,
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message_type = 53,
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server_identifier = 54,
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parameter_request_list = 55,
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maximum_message_size = 57,
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client_identifier = 61,
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end = 255,
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};
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};
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struct message_type {
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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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};
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struct message_parameters {
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uint32_t your_ip_address;
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uint32_t next_server_ip_address;
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uint32_t server_identifier;
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uint32_t subnet_mask;
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uint32_t router;
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uint32_t domain_name_server;
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uint32_t requested_ip_address;
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};
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int make_message(void * buf,
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uint32_t bootp_message_type,
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uint32_t transaction_id,
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uint8_t const * chaddr,
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uint32_t dhcp_message_type,
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message_parameters const * params);
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char const * message_type_tostr(int message_type);
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void parse_options(message const * m, int options_length, options * o);
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}
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