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
|
/* $Id: arp.h,v 0.2 1997/08/30 16:52:05 yoichi v0_70 $
*
* dhcpcd - DHCP client daemon -
* Copyright (C) 1996 - 1997 Yoichi Hariguchi <yoichi@fore.com>
*
* Dhcpcd is an RFC2131 and RFC1541 compliant DHCP client daemon.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define MAC_BCAST_ADDR "\xff\xff\xff\xff\xff\xff"
struct arpMsg {
struct ethhdr ethhdr; /* Ethernet header */
u_short htype; /* hardware type (must be ARPHRD_ETHER) */
u_short ptype; /* protocol type (must be ETH_P_IP) */
u_char hlen; /* hardware address length (must be 6) */
u_char plen; /* protocol address length (must be 4) */
u_short operation; /* ARP opcode */
u_char sHaddr[6]; /* sender's hardware address */
u_char sInaddr[4]; /* sender's IP address */
u_char tHaddr[6]; /* target's hardware address */
u_char tInaddr[4]; /* target's IP address */
u_char pad[18]; /* pad for min. Ethernet payload (60 bytes) */
};
/* function prototypes
*/
int arpCheck(u_long inaddr, struct ifinfo *ifbuf, long timeout);
/* requests: 'inaddr' containing the target IP address (network byte order).
* 'ifbuf' pointing to the structure containing interface info.
* 'timeout' specifies how many seconds it waits for ARP reply msg.
* effects: it sends an ARP request message whose target address is specified
* with 'inaddr' onto the interface described with 'ifbuf', and waits
* for ARP reply msg to it for 'timeout' seconds. it checks ARP reply
* message(s) if it gets it/them and returns result.
* modifies: nothing
* returns: 1 if no hosts are using 'inaddr'
* 0 if somebody else is using 'inaddr'
*/
void sendArpReply(u_char *thaddr, u_long tinaddr, struct ifinfo *ifbuf);
/* requests: 'thaddr' pointing to the target MAC address
* 'tinaddr' containing the target IP address (network byte order).
* 'ifbuf' pointing to the structure containing interface info.
* effects: it sends an ARP request message whose target address is specified
* with 'tinaddr' onto the interface described with 'ifbuf'.
* modifies: nothing
* returns: nothing
*/
void mkArpMsg(int opcode, u_long tInaddr, u_char *tHaddr,
u_long sInaddr, u_char *sHaddr, struct arpMsg *msg);
/* requests: 'opcode' containing the ARP OP code (1: ARP request, etc.)
* 'tInaddr' containing the target IP address (network byte order)
* 'tHaddr' pointing to the array containing target MAC address
* 'sInaddr' containing the source IP address (network byte order)
* 'tHaddr' pointing to the array containing source MAC address
* 'msg' pointing to the structure where the ARP message is copied
* effects: it makes an ARP message in '*msg'
* modifies: '*msg'
* returns: nothing
*/
|
