1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/**
* 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
#define DHCPV4_FR_MIN_DELAY 500
#define DHCPV4_FR_MAX_FUZZ 500
enum dhcpv4_op {
DHCPV4_OP_BOOTREQUEST = 1,
DHCPV4_OP_BOOTREPLY = 2,
};
// https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#message-type-53
enum dhcpv4_msg {
DHCPV4_MSG_DISCOVER = 1, // RFC2132
DHCPV4_MSG_OFFER = 2, // RFC2132
DHCPV4_MSG_REQUEST = 3, // RFC2132
DHCPV4_MSG_DECLINE = 4, // RFC2132
DHCPV4_MSG_ACK = 5, // RFC2132
DHCPV4_MSG_NAK = 6, // RFC2132
DHCPV4_MSG_RELEASE = 7, // RFC2132
DHCPV4_MSG_INFORM = 8, // RFC2132
DHCPV4_MSG_FORCERENEW = 9, // RFC3203
DHCPV4_MSG_LEASEQUERY = 10, // RFC4388
DHCPV4_MSG_LEASEUNASSIGNED = 11, // RFC4388
DHCPV4_MSG_LEASEUNKNOWN = 12, // RFC4388
DHCPV4_MSG_LEASEACTIVE = 13, // RFC4388
DHCPV4_MSG_BULKLEASEQUERY = 14, // RFC6926
DHCPV4_MSG_LEASEQUERYDONE = 15, // RFC6926
DHCPV4_MSG_ACTIVELEASEQUERY = 16, // RFC7724
DHCPV4_MSG_LEASEQUERYSTATUS = 17, // RFC7724
DHCPV4_MSG_TLS = 18, // RFC7724
};
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_DNR = 162,
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];
uint32_t cookie;
uint8_t options[308];
} _packed;
// RFC2131, §3
#define DHCPV4_MAGIC_COOKIE 0x63825363
// RFC3203, §6; RFC3118, §2; RFC6704, §3.1.2
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;
// https://www.iana.org/assignments/auth-namespaces/auth-namespaces.xhtml#auth-namespaces-1
enum dhcpv4_auth_protocol {
DHCPV4_AUTH_PROTO_CFG_TOKEN = 0, // RFC3118
DHCPV4_AUTH_PROTO_DELAYED = 1, // RFC3118
DHCPV4_AUTH_PROTO_DELAYED_OBS = 2, // RFC8415, Obsolete
DHCPV4_AUTH_PROTO_RKAP = 3, // RFC8415, also RFC6704
DHCPV4_AUTH_PROTO_SPLIT_DNS = 4, // RFC9704
};
// https://www.iana.org/assignments/auth-namespaces/auth-namespaces.xhtml#auth-namespaces-2
enum dhcpv4_auth_algorithm {
DHCPV4_AUTH_ALG_CFG_TOKEN = 0, // RFC3118
DHCPV4_AUTH_ALG_HMAC_MD5 = 1, // RFC3118, RFC8415, also RFC6704
};
// https://www.iana.org/assignments/auth-namespaces/auth-namespaces.xhtml#auth-namespaces-2
enum dhcpv4_auth_rdm {
DHCPV4_AUTH_RDM_MONOTONIC = 0, // RFC3118, RFC8415, also RFC6704
};
// RFC6704, §3.1.2 (for DHCPv6: RFC8415, §20.4)
enum dhcpv4_auth_rkap_ai_type {
DHCPV4_AUTH_RKAP_AI_TYPE_KEY = 1,
DHCPV4_AUTH_RKAP_AI_TYPE_MD5_DIGEST = 2,
};
struct dhcpv4_option {
uint8_t type;
uint8_t len;
uint8_t data[];
};
/* DNR */
struct dhcpv4_dnr {
uint16_t len;
uint16_t priority;
uint8_t adn_len;
uint8_t body[];
};
#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])
|
