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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
* dhcpcd - DHCP client daemon
* Copyright 2006-2008 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef DHCP_H
#define DHCP_H
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <stdint.h>
#include "dhcpcd.h"
#include "interface.h"
/* Max MTU - defines dhcp option length */
#define MTU_MAX 1500
#define MTU_MIN 576
/* UDP port numbers for DHCP */
#define DHCP_SERVER_PORT 67
#define DHCP_CLIENT_PORT 68
#define MAGIC_COOKIE 0x63825363
#define BROADCAST_FLAG 0x8000
/* DHCP message OP code */
#define DHCP_BOOTREQUEST 1
#define DHCP_BOOTREPLY 2
/* DHCP message type */
#define DHCP_DISCOVER 1
#define DHCP_OFFER 2
#define DHCP_REQUEST 3
#define DHCP_DECLINE 4
#define DHCP_ACK 5
#define DHCP_NAK 6
#define DHCP_RELEASE 7
#define DHCP_INFORM 8
/* DHCP options */
enum DHCP_OPTIONS
{
DHCP_PAD = 0,
DHCP_NETMASK = 1,
DHCP_TIMEROFFSET = 2,
DHCP_ROUTERS = 3,
DHCP_TIMESERVER = 4,
DHCP_NAMESERVER = 5,
DHCP_DNSSERVER = 6,
DHCP_LOGSERVER = 7,
DHCP_COOKIESERVER = 8,
DHCP_HOSTNAME = 12,
DHCP_DNSDOMAIN = 15,
DHCP_ROOTPATH = 17,
DHCP_DEFAULTIPTTL = 23,
DHCP_MTU = 26,
DHCP_BROADCAST = 28,
DHCP_MASKDISCOVERY = 29,
DHCP_ROUTERDISCOVERY = 31,
DHCP_STATICROUTE = 33,
DHCP_NISDOMAIN = 40,
DHCP_NISSERVER = 41,
DHCP_NTPSERVER = 42,
DHCP_ADDRESS = 50,
DHCP_LEASETIME = 51,
DHCP_OPTIONSOVERLOADED = 52,
DHCP_MESSAGETYPE = 53,
DHCP_SERVERIDENTIFIER = 54,
DHCP_PARAMETERREQUESTLIST = 55,
DHCP_MESSAGE = 56,
DHCP_MAXMESSAGESIZE = 57,
DHCP_RENEWALTIME = 58,
DHCP_REBINDTIME = 59,
DHCP_CLASSID = 60,
DHCP_CLIENTID = 61,
DHCP_USERCLASS = 77, /* RFC 3004 */
DHCP_FQDN = 81,
DHCP_DNSSEARCH = 119, /* RFC 3397 */
DHCP_SIPSERVER = 120, /* RFC 3361 */
DHCP_CSR = 121, /* RFC 3442 */
DHCP_MSCSR = 249, /* MS code for RFC 3442 */
DHCP_END = 255
};
/* SetFQDNHostName values - lsnybble used in flags
* byte (see buildmsg.c), hsnybble to create order
* and to allow 0x00 to mean disable
*/
enum FQQN {
FQDN_DISABLE = 0x00,
FQDN_NONE = 0x18,
FQDN_PTR = 0x20,
FQDN_BOTH = 0x31
};
typedef struct fqdn_t
{
uint8_t flags;
uint8_t r1;
uint8_t r2;
char *name;
} fqdn_t;
typedef struct dhcp_t
{
char version[11];
struct in_addr serveraddress;
char serverhw[IF_NAMESIZE];
char servername[64];
struct in_addr address;
struct in_addr netmask;
struct in_addr broadcast;
unsigned short mtu;
uint32_t leasedfrom;
uint32_t leasetime;
uint32_t renewaltime;
uint32_t rebindtime;
struct route_head *routes;
char *hostname;
fqdn_t *fqdn;
struct address_head *dnsservers;
char *dnsdomain;
char *dnssearch;
struct address_head *ntpservers;
struct address_head *nisservers;
char *nisdomain;
char *sipservers;
char *message;
char *rootpath;
bool frominfo;
} dhcp_t;
/* Sizes for DHCP options */
#define DHCP_CHADDR_LEN 16
#define SERVERNAME_LEN 64
#define BOOTFILE_LEN 128
#define DHCP_UDP_LEN (20 + 8)
#define DHCP_BASE_LEN (4 + 4 + 2 + 2 + 4 + 4 + 4 + 4 + 4)
#define DHCP_RESERVE_LEN (4 + 4 + 4 + 4 + 2)
#define DHCP_FIXED_LEN (DHCP_BASE_LEN + DHCP_CHADDR_LEN + \
+ SERVERNAME_LEN + BOOTFILE_LEN)
#define DHCP_OPTION_LEN (MTU_MAX - DHCP_FIXED_LEN - DHCP_UDP_LEN \
- DHCP_RESERVE_LEN)
/* Some crappy DHCP servers require the BOOTP minimum length */
#define BOOTP_MESSAGE_LENTH_MIN 300
typedef struct dhcpmessage_t
{
unsigned char op; /* message type */
unsigned char hwtype; /* hardware address type */
unsigned char hwlen; /* hardware address length */
unsigned char hwopcount; /* should be zero in client message */
uint32_t xid; /* transaction id */
uint16_t secs; /* elapsed time in sec. from boot */
uint16_t flags;
uint32_t ciaddr; /* (previously allocated) client IP */
uint32_t yiaddr; /* 'your' client IP address */
uint32_t siaddr; /* should be zero in client's messages */
uint32_t giaddr; /* should be zero in client's messages */
unsigned char chaddr[DHCP_CHADDR_LEN]; /* client's hardware address */
unsigned char servername[SERVERNAME_LEN]; /* server host name */
unsigned char bootfile[BOOTFILE_LEN]; /* boot file name */
uint32_t cookie;
unsigned char options[DHCP_OPTION_LEN]; /* message options - cookie */
} dhcpmessage_t;
struct udp_dhcp_packet
{
struct ip ip;
struct udphdr udp;
dhcpmessage_t dhcp;
};
ssize_t send_message (const interface_t *iface, const dhcp_t *dhcp,
uint32_t xid, char type, const options_t *options);
void free_dhcp (dhcp_t *dhcp);
int parse_dhcpmessage (dhcp_t *dhcp, const dhcpmessage_t *message);
#endif
|
