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"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Mike Frysinger7031f622006-05-08 03:20:50 +00002/* common.h
3 *
4 * Russ Dill <Russ.Dill@asu.edu> September 2001
5 * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
6 *
Rob Landley3f785612006-05-28 01:06:36 +00007 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Mike Frysinger7031f622006-05-08 03:20:50 +00008 */
9
10#ifndef _COMMON_H
11#define _COMMON_H
12
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000013#include "libbb.h"
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000014
Denis Vlasenko1d14e6f2006-12-22 11:47:19 +000015#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000016
Denis Vlasenkob76b9a42008-01-25 22:46:34 +000017#define SERVER_PORT 67
18#define CLIENT_PORT 68
19
Denis Vlasenkofbd29182007-04-07 01:05:47 +000020extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000021
22/*** packet.h ***/
23
24#include <netinet/udp.h>
25#include <netinet/ip.h>
26
Denis Vlasenkob76b9a42008-01-25 22:46:34 +000027#define DHCP_OPTIONS_BUFSIZE 308
Denis Vlasenko72e76042007-11-25 03:15:24 +000028
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000029struct dhcpMessage {
30 uint8_t op;
31 uint8_t htype;
32 uint8_t hlen;
33 uint8_t hops;
34 uint32_t xid;
35 uint16_t secs;
36 uint16_t flags;
37 uint32_t ciaddr;
38 uint32_t yiaddr;
39 uint32_t siaddr;
40 uint32_t giaddr;
41 uint8_t chaddr[16];
42 uint8_t sname[64];
43 uint8_t file[128];
44 uint32_t cookie;
Denis Vlasenko72e76042007-11-25 03:15:24 +000045 uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
Denis Vlasenko6884f662007-11-23 00:08:54 +000046} ATTRIBUTE_PACKED;
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000047
48struct udp_dhcp_packet {
49 struct iphdr ip;
50 struct udphdr udp;
51 struct dhcpMessage data;
Denis Vlasenko6884f662007-11-23 00:08:54 +000052} ATTRIBUTE_PACKED;
53
54/* Let's see whether compiler understood us right */
55struct BUG_bad_sizeof_struct_udp_dhcp_packet {
56 char BUG_bad_sizeof_struct_udp_dhcp_packet
Denis Vlasenko72e76042007-11-25 03:15:24 +000057 [(sizeof(struct udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000058};
59
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000060uint16_t udhcp_checksum(void *addr, int count);
Denis Vlasenkofff145d2007-12-20 21:11:38 +000061
62void udhcp_init_header(struct dhcpMessage *packet, char type);
63
64int udhcp_recv_packet(struct dhcpMessage *packet, int fd);
65int udhcp_send_raw_packet(struct dhcpMessage *payload,
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000066 uint32_t source_ip, int source_port,
Denis Vlasenkofbd29182007-04-07 01:05:47 +000067 uint32_t dest_ip, int dest_port,
68 const uint8_t *dest_arp, int ifindex);
Denis Vlasenkofff145d2007-12-20 21:11:38 +000069int udhcp_send_kernel_packet(struct dhcpMessage *payload,
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000070 uint32_t source_ip, int source_port,
71 uint32_t dest_ip, int dest_port);
72
73
74/**/
75
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000076void udhcp_run_script(struct dhcpMessage *packet, const char *name);
77
78// Still need to clean these up...
79
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000080/* from options.h */
81#define get_option udhcp_get_option
82#define end_option udhcp_end_option
83#define add_option_string udhcp_add_option_string
84#define add_simple_option udhcp_add_simple_option
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000085/* from socket.h */
86#define listen_socket udhcp_listen_socket
87#define read_interface udhcp_read_interface
Mike Frysinger7031f622006-05-08 03:20:50 +000088
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000089void udhcp_sp_setup(void);
90int udhcp_sp_fd_set(fd_set *rfds, int extra_fd);
Denis Vlasenko223bc972007-11-22 00:58:49 +000091int udhcp_sp_read(const fd_set *rfds);
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000092int raw_socket(int ifindex);
Denis Vlasenkob6aae0f2007-01-29 22:51:25 +000093int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp);
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +000094int listen_socket(/*uint32_t ip,*/ int port, const char *inf);
Denis Vlasenko42b3dea2007-07-03 15:47:50 +000095/* Returns 1 if no reply received */
96int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface);
Mike Frysinger7031f622006-05-08 03:20:50 +000097
Rob Landley3f785612006-05-28 01:06:36 +000098#if ENABLE_FEATURE_UDHCP_DEBUG
Denis Vlasenkob76b9a42008-01-25 22:46:34 +000099# define DEBUG(str, args...) bb_info_msg("### " str, ## args)
Mike Frysinger7031f622006-05-08 03:20:50 +0000100#else
Denis Vlasenko5a3395b2006-11-18 19:51:32 +0000101# define DEBUG(str, args...) do {;} while (0)
Mike Frysinger7031f622006-05-08 03:20:50 +0000102#endif
103
104#endif