1 /*
2 * $Id: icmp_mask.c,v 1.1.1.1 1999/05/18 15:33:43 dugsong Exp $
3 *
4 * libnet
5 * icmp.c - Build an ICMP_HOSTMASK packet at the link layer
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 u_long src_ip, dst_ip;
44 char errbuf[256];
45 char *device = NULL;
46 struct link_int *l;
47
48 printf("link layer ICMP packet building/writing test\n");
49
50 src_ip = 0;
51 dst_ip = 0;
52 while ((c = getopt(argc, argv, "i:d:s:")) != EOF)
53 {
54 switch (c)
55 {
56 case 'd':
57 if (!(dst_ip = libnet_name_resolve(optarg, 1)))
58 {
59 fprintf(stderr, "Bad destination IP address: %s\n", optarg);
60 exit(1);
61 }
62 break;
63 case 'i':
64 device = optarg;
65 break;
66 case 's':
67 if (!(src_ip = libnet_name_resolve(optarg, 1)))
68 {
69 fprintf(stderr, "Bad source IP address: %s\n", optarg);
70 exit(1);
71 }
72 break;
73 default:
74 exit(EXIT_FAILURE);
75 }
76 }
77
78 if (!src_ip || !dst_ip || !device)
79 {
80 usage(argv[0]);
81 exit(EXIT_FAILURE);
82 }
83
84 if ((l = libnet_open_link_interface(device, errbuf)) == NULL)
85 {
86 fprintf(stderr, "libnet_open_link_interface: %s\n", errbuf);
87 exit(EXIT_FAILURE);
88 }
89 c = send_icmp(l, device, src_ip, dst_ip);
90
91 return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
92 }
93
94
95 int
send_icmp(struct link_int * l,u_char * device,u_long src_ip,u_long dst_ip)96 send_icmp(struct link_int *l, u_char *device, u_long src_ip, u_long dst_ip)
97 {
98 int n;
99 u_char *buf;
100
101 if (libnet_init_packet(ICMP_MASK_H + IP_H + ETH_H, &buf) == -1)
102 {
103 perror("no packet memory");
104 exit(EXIT_FAILURE);
105 }
106
107 /*
108 * Ethernet header
109 */
110 libnet_build_ethernet(enet_dst, enet_src, ETHERTYPE_IP, NULL, 0, buf);
111
112 libnet_build_ip(ICMP_MASK_H,
113 0, /* IP tos */
114 242, /* IP ID */
115 0, /* Frag */
116 64, /* TTL */
117 IPPROTO_ICMP, /* Transport protocol */
118 src_ip, /* Source IP */
119 dst_ip, /* Destination IP */
120 NULL, /* Pointer to payload (none) */
121 0,
122 buf + ETH_H); /* Packet header memory */
123
124 libnet_build_icmp_mask(ICMP_MASKREPLY, /* type */
125 0, /* code */
126 242, /* id */
127 0, /* seq */
128 0xffffffff, /* mask */
129 NULL, /* payload */
130 0, /* payload_s */
131 buf + ETH_H + IP_H);
132
133 libnet_do_checksum(buf + ETH_H, IPPROTO_IP, IP_H);
134 libnet_do_checksum(buf + ETH_H, IPPROTO_ICMP, ICMP_H);
135
136 printf("Packet as it will appear on the wire (give or take):");
137 libnet_hex_dump(buf, ETH_H + IP_H + ICMP_MASK_H, 0, stdout);
138 printf("\n");
139
140 n = libnet_write_link_layer(l, device, buf, ETH_H + IP_H + ICMP_MASK_H);
141 if (n != ETH_H + IP_H + ICMP_MASK_H)
142 {
143 fprintf(stderr, "Oopz. Only wrote %d bytes\n", n);
144 }
145 else
146 {
147 printf("Wrote %d byte ICMP packet through linktype %d\n", n, l->linktype);
148 }
149 libnet_destroy_packet(&buf);
150 return (n);
151 }
152
153
154 void
usage(u_char * name)155 usage(u_char *name)
156 {
157 fprintf(stderr, "usage: %s -i interface -s source_ip -d destination_ip\n", name);
158 }
159
160 /* EOF */
161