1/* vi: set sw=4 ts=4: */
2/* common.h
3 *
4 * Russ Dill <Russ.Dill@asu.edu> September 2001
5 * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#ifndef _COMMON_H
11#define _COMMON_H
12
13#include "libbb.h"
14
15#define DEFAULT_SCRIPT  "/usr/share/udhcpc/default.script"
16
17extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
18
19/*** packet.h ***/
20
21#include <netinet/udp.h>
22#include <netinet/ip.h>
23
24struct dhcpMessage {
25	uint8_t op;
26	uint8_t htype;
27	uint8_t hlen;
28	uint8_t hops;
29	uint32_t xid;
30	uint16_t secs;
31	uint16_t flags;
32	uint32_t ciaddr;
33	uint32_t yiaddr;
34	uint32_t siaddr;
35	uint32_t giaddr;
36	uint8_t chaddr[16];
37	uint8_t sname[64];
38	uint8_t file[128];
39	uint32_t cookie;
40	uint8_t options[308]; /* 312 - cookie */
41};
42
43struct udp_dhcp_packet {
44	struct iphdr ip;
45	struct udphdr udp;
46	struct dhcpMessage data;
47};
48
49void udhcp_init_header(struct dhcpMessage *packet, char type);
50int udhcp_get_packet(struct dhcpMessage *packet, int fd);
51uint16_t udhcp_checksum(void *addr, int count);
52int udhcp_raw_packet(struct dhcpMessage *payload,
53		uint32_t source_ip, int source_port,
54		uint32_t dest_ip, int dest_port,
55		const uint8_t *dest_arp, int ifindex);
56int udhcp_kernel_packet(struct dhcpMessage *payload,
57		uint32_t source_ip, int source_port,
58		uint32_t dest_ip, int dest_port);
59
60
61/**/
62
63void udhcp_run_script(struct dhcpMessage *packet, const char *name);
64
65// Still need to clean these up...
66
67/* from options.h */
68#define get_option		udhcp_get_option
69#define end_option		udhcp_end_option
70#define add_option_string	udhcp_add_option_string
71#define add_simple_option	udhcp_add_simple_option
72#define option_lengths		udhcp_option_lengths
73/* from socket.h */
74#define listen_socket		udhcp_listen_socket
75#define read_interface		udhcp_read_interface
76/* from dhcpc.h */
77#define client_config		udhcp_client_config
78/* from dhcpd.h */
79#define server_config		udhcp_server_config
80
81void udhcp_sp_setup(void);
82int udhcp_sp_fd_set(fd_set *rfds, int extra_fd);
83int udhcp_sp_read(fd_set *rfds);
84int raw_socket(int ifindex);
85int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp);
86int listen_socket(/*uint32_t ip,*/ int port, const char *inf);
87/* Returns 1 if no reply received */
88int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface);
89
90#if ENABLE_FEATURE_UDHCP_DEBUG
91# define DEBUG(str, args...) bb_info_msg(str, ## args)
92#else
93# define DEBUG(str, args...) do {;} while (0)
94#endif
95
96#endif
97