5 #include <netinet/ip.h>
6 #include <netinet/udp.h>
8 #include "libbb_udhcp.h"
11 /************************************/
12 /* Defaults _you_ may want to tweak */
13 /************************************/
15 /* the period of time the client is allowed to use that address */
16 #define LEASE_TIME (60*60*24*10) /* 10 days of seconds */
17 #define LEASES_FILE "/var/lib/misc/udhcpd.leases"
19 /* where to find the DHCP server configuration file */
20 #define DHCPD_CONF_FILE "/etc/udhcpd.conf"
22 /*****************************************************************/
23 /* Do not modify below here unless you know what you are doing!! */
24 /*****************************************************************/
26 /* DHCP protocol -- see RFC 2131 */
27 #define SERVER_PORT 67
28 #define CLIENT_PORT 68
30 #define DHCP_MAGIC 0x63825363
32 /* DHCP option codes (partial list) */
33 #define DHCP_PADDING 0x00
34 #define DHCP_SUBNET 0x01
35 #define DHCP_TIME_OFFSET 0x02
36 #define DHCP_ROUTER 0x03
37 #define DHCP_TIME_SERVER 0x04
38 #define DHCP_NAME_SERVER 0x05
39 #define DHCP_DNS_SERVER 0x06
40 #define DHCP_LOG_SERVER 0x07
41 #define DHCP_COOKIE_SERVER 0x08
42 #define DHCP_LPR_SERVER 0x09
43 #define DHCP_HOST_NAME 0x0c
44 #define DHCP_BOOT_SIZE 0x0d
45 #define DHCP_DOMAIN_NAME 0x0f
46 #define DHCP_SWAP_SERVER 0x10
47 #define DHCP_ROOT_PATH 0x11
48 #define DHCP_IP_TTL 0x17
50 #define DHCP_BROADCAST 0x1c
51 #define DHCP_NTP_SERVER 0x2a
52 #define DHCP_WINS_SERVER 0x2c
53 #define DHCP_REQUESTED_IP 0x32
54 #define DHCP_LEASE_TIME 0x33
55 #define DHCP_OPTION_OVER 0x34
56 #define DHCP_MESSAGE_TYPE 0x35
57 #define DHCP_SERVER_ID 0x36
58 #define DHCP_PARAM_REQ 0x37
59 #define DHCP_MESSAGE 0x38
60 #define DHCP_MAX_SIZE 0x39
63 #define DHCP_VENDOR 0x3c
64 #define DHCP_CLIENT_ID 0x3d
65 #define DHCP_FQDN 0x51
74 #define ETH_10MB_LEN 6
76 #define DHCPDISCOVER 1
85 #define BROADCAST_FLAG 0x8000
87 #define OPTION_FIELD 0
91 /* miscellaneous defines */
92 #define MAC_BCAST_ADDR (uint8_t *) "\xff\xff\xff\xff\xff\xff"
99 struct option_set *next;
102 struct static_lease {
105 struct static_lease *next;
108 struct server_config_t {
109 uint32_t server; /* Our IP, in network order */
110 uint32_t start; /* Start address of leases, network order */
111 uint32_t end; /* End of leases, network order */
112 struct option_set *options; /* List of DHCP options loaded from the config file */
113 char *interface; /* The name of the interface to use */
114 int ifindex; /* Index number of the interface to use */
115 uint8_t arp[6]; /* Our arp address */
116 unsigned long lease; /* lease time in seconds (host order) */
117 unsigned long max_leases; /* maximum number of leases (including reserved address) */
118 char remaining; /* should the lease file be interpreted as lease time remaining, or
119 * as the time the lease expires */
120 unsigned long auto_time; /* how long should udhcpd wait before writing a config file.
121 * if this is zero, it will only write one on SIGUSR1 */
122 unsigned long decline_time; /* how long an address is reserved if a client returns a
124 unsigned long conflict_time; /* how long an arp conflict offender is leased for */
125 unsigned long offer_time; /* how long an offered address is reserved */
126 unsigned long min_lease; /* minimum lease a client can request*/
129 char *notify_file; /* What to run whenever leases are written */
130 uint32_t siaddr; /* next server bootp option */
131 char *sname; /* bootp server name */
132 char *boot_file; /* bootp boot file option */
133 struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
136 extern struct server_config_t server_config;
137 extern struct dhcpOfferedAddr *leases;