1 /*
2 * $Id: arp.c,v 1.1.1.1 1999/05/18 15:33:43 dugsong Exp $
3 *
4 * libnet
5 * arp.c - Build an ARP packet
6 *
7 * Copyright (c) 1998, 1999 Mike D. Schiffman <mike@infonexus.com>
8 * route|daemon9 <route@infonexus.com>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 #if (HAVE_CONFIG_H)
35 #include "../../include/config.h"
36 #endif
37 #include "../libnet_test.h"
38
39 int
main(int argc,char * argv[])40 main(int argc, char *argv[])
41 {
42 int c;
43 char errbuf[256];
44 char *device = NULL;
45 struct link_int *l;
46
47 while ((c = getopt(argc, argv, "i:")) != EOF)
48 {
49 switch (c)
50 {
51 case 'i':
52 device = optarg;
53 break;
54 default:
55 exit(EXIT_FAILURE);
56 }
57 }
58
59 if (!device)
60 {
61 fprintf(stderr, "Specify a device\n");
62 exit(EXIT_FAILURE);
63 }
64
65 l = libnet_open_link_interface(device, errbuf);
66 if (!l)
67 {
68 fprintf(stderr, "libnet_open_link_interface: %s\n", errbuf);
69 exit(EXIT_FAILURE);
70 }
71 c = send_arp(l, device);
72
73 return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
74 }
75
76
77 int
send_arp(struct link_int * l,u_char * device)78 send_arp(struct link_int *l, u_char *device)
79 {
80 int n;
81 u_char *buf;
82
83 if (libnet_init_packet(ARP_H + ETH_H, &buf) == -1)
84 {
85 perror("libnet_init_packet memory:");
86 exit(EXIT_FAILURE);
87 }
88
89 /*
90 * Ethernet header
91 */
92 libnet_build_ethernet(enet_dst, enet_src, ETHERTYPE_ARP, NULL, 0, buf);
93
94 /*
95 * ARP header
96 */
97 libnet_build_arp(ARPHRD_ETHER,
98 ETHERTYPE_IP,
99 6,
100 4,
101 ARPOP_REQUEST,
102 enet_src,
103 ip_src,
104 enet_dst,
105 ip_dst,
106 NULL,
107 0,
108 buf + ETH_H);
109
110 n = libnet_write_link_layer(l, device, buf, ARP_H + ETH_H);
111
112 printf("Wrote %d byte ARP packet through linktype %d\n", n, l->linktype);
113
114 libnet_destroy_packet(&buf);
115 return (n);
116 }
117
118 /* EOF */
119