aboutsummaryrefslogtreecommitdiff
path: root/networking/udhcp/dhcpd.h
blob: 65c8348bf641e48c88c0901152c2b4260f316e47 (plain)
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
/* dhcpd.h */
#ifndef _DHCPD_H
#define _DHCPD_H

#include <netinet/ip.h>
#include <netinet/udp.h>

#include "libbb_udhcp.h"
#include "leases.h"
#include "version.h"

/************************************/
/* Defaults _you_ may want to tweak */
/************************************/

/* the period of time the client is allowed to use that address */
#define LEASE_TIME              (60*60*24*10) /* 10 days of seconds */
#define LEASES_FILE		"/var/lib/misc/udhcpd.leases"

/* where to find the DHCP server configuration file */
#define DHCPD_CONF_FILE         "/etc/udhcpd.conf"

/*****************************************************************/
/* Do not modify below here unless you know what you are doing!! */
/*****************************************************************/

/* DHCP protocol -- see RFC 2131 */
#define SERVER_PORT		67
#define CLIENT_PORT		68

#define DHCP_MAGIC		0x63825363

/* DHCP option codes (partial list) */
#define DHCP_PADDING		0x00
#define DHCP_SUBNET		0x01
#define DHCP_TIME_OFFSET	0x02
#define DHCP_ROUTER		0x03
#define DHCP_TIME_SERVER	0x04
#define DHCP_NAME_SERVER	0x05
#define DHCP_DNS_SERVER		0x06
#define DHCP_LOG_SERVER		0x07
#define DHCP_COOKIE_SERVER	0x08
#define DHCP_LPR_SERVER		0x09
#define DHCP_HOST_NAME		0x0c
#define DHCP_BOOT_SIZE		0x0d
#define DHCP_DOMAIN_NAME	0x0f
#define DHCP_SWAP_SERVER	0x10
#define DHCP_ROOT_PATH		0x11
#define DHCP_IP_TTL		0x17
#define DHCP_MTU		0x1a
#define DHCP_BROADCAST		0x1c
#define DHCP_NTP_SERVER		0x2a
#define DHCP_WINS_SERVER	0x2c
#define DHCP_REQUESTED_IP	0x32
#define DHCP_LEASE_TIME		0x33
#define DHCP_OPTION_OVER	0x34
#define DHCP_MESSAGE_TYPE	0x35
#define DHCP_SERVER_ID		0x36
#define DHCP_PARAM_REQ		0x37
#define DHCP_MESSAGE		0x38
#define DHCP_MAX_SIZE		0x39
#define DHCP_T1			0x3a
#define DHCP_T2			0x3b
#define DHCP_VENDOR		0x3c
#define DHCP_CLIENT_ID		0x3d
#define DHCP_FQDN		0x51

#define DHCP_END		0xFF


#define BOOTREQUEST		1
#define BOOTREPLY		2

#define ETH_10MB		1
#define ETH_10MB_LEN		6

#define DHCPDISCOVER		1
#define DHCPOFFER		2
#define DHCPREQUEST		3
#define DHCPDECLINE		4
#define DHCPACK			5
#define DHCPNAK			6
#define DHCPRELEASE		7
#define DHCPINFORM		8

#define BROADCAST_FLAG		0x8000

#define OPTION_FIELD		0
#define FILE_FIELD		1
#define SNAME_FIELD		2

/* miscellaneous defines */
#define MAC_BCAST_ADDR		(uint8_t *) "\xff\xff\xff\xff\xff\xff"
#define OPT_CODE 0
#define OPT_LEN 1
#define OPT_DATA 2

struct option_set {
	uint8_t *data;
	struct option_set *next;
};

struct static_lease {
	uint8_t *mac;
	uint32_t *ip;
	struct static_lease *next;
};

struct server_config_t {
	uint32_t server;		/* Our IP, in network order */
	uint32_t start;		/* Start address of leases, network order */
	uint32_t end;			/* End of leases, network order */
	struct option_set *options;	/* List of DHCP options loaded from the config file */
	char *interface;		/* The name of the interface to use */
	int ifindex;			/* Index number of the interface to use */
	uint8_t arp[6];		/* Our arp address */
	unsigned long lease;		/* lease time in seconds (host order) */
	unsigned long max_leases; 	/* maximum number of leases (including reserved address) */
	char remaining; 		/* should the lease file be interpreted as lease time remaining, or
			 		 * as the time the lease expires */
	unsigned long auto_time; 	/* how long should udhcpd wait before writing a config file.
					 * if this is zero, it will only write one on SIGUSR1 */
	unsigned long decline_time; 	/* how long an address is reserved if a client returns a
				    	 * decline message */
	unsigned long conflict_time; 	/* how long an arp conflict offender is leased for */
	unsigned long offer_time; 	/* how long an offered address is reserved */
	unsigned long min_lease; 	/* minimum lease a client can request*/
	char *lease_file;
	char *pidfile;
	char *notify_file;		/* What to run whenever leases are written */
	uint32_t siaddr;		/* next server bootp option */
	char *sname;			/* bootp server name */
	char *boot_file;		/* bootp boot file option */
	struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
};

extern struct server_config_t server_config;
extern struct dhcpOfferedAddr *leases;


#endif