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
|
/* vi: set sw=4 ts=4: */
/* dhcpd.h */
#ifndef _DHCPD_H
#define _DHCPD_H
#if __GNUC_PREREQ(4,1)
# pragma GCC visibility push(hidden)
#endif
/************************************/
/* 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 CONFIG_DHCPD_LEASES_FILE
/* where to find the DHCP server configuration file */
#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
struct option_set {
uint8_t *data;
struct option_set *next;
};
struct static_lease {
struct static_lease *next;
uint8_t *mac;
uint32_t *ip;
};
struct server_config_t {
uint32_t server; /* Our IP, in network order */
#if ENABLE_FEATURE_UDHCP_PORT
uint16_t port;
#endif
/* start,end are in host order: we need to compare start <= ip <= end */
uint32_t start_ip; /* Start address of leases, in host order */
uint32_t end_ip; /* End of leases, in host 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 */
char remaining; /* should the lease file be interpreted as lease time remaining, or
* as the time the lease expires */
uint32_t lease; /* lease time in seconds (host order) */
uint32_t max_leases; /* maximum number of leases (including reserved address) */
uint32_t auto_time; /* how long should udhcpd wait before writing a config file.
* if this is zero, it will only write one on SIGUSR1 */
uint32_t decline_time; /* how long an address is reserved if a client returns a
* decline message */
uint32_t conflict_time; /* how long an arp conflict offender is leased for */
uint32_t offer_time; /* how long an offered address is reserved */
uint32_t 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 */
};
#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
/* client_config sits in 2nd half of bb_common_bufsiz1 */
#if ENABLE_FEATURE_UDHCP_PORT
#define SERVER_PORT (server_config.port)
#else
#define SERVER_PORT 67
#endif
extern struct dhcpOfferedAddr *leases;
/*** leases.h ***/
struct dhcpOfferedAddr {
uint8_t chaddr[16];
uint32_t yiaddr; /* network order */
uint32_t expires; /* host order */
};
struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
int lease_expired(struct dhcpOfferedAddr *lease);
struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
uint32_t find_address(int check_expired);
/*** static_leases.h ***/
/* Config file will pass static lease info to this function which will add it
* to a data structure that can be searched later */
int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
/* Check to see if a mac has an associated static lease */
uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
/* Check to see if an ip is reserved as a static ip */
uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
/* Print out static leases just to check what's going on (debug code) */
void printStaticLeases(struct static_lease **lease_struct);
/*** serverpacket.h ***/
int sendOffer(struct dhcpMessage *oldpacket);
int sendNAK(struct dhcpMessage *oldpacket);
int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
int send_inform(struct dhcpMessage *oldpacket);
/*** files.h ***/
void read_config(const char *file);
void write_leases(void);
void read_leases(const char *file);
struct option_set *find_option(struct option_set *opt_list, uint8_t code);
#if __GNUC_PREREQ(4,1)
# pragma GCC visibility pop
#endif
#endif
|
