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1.1 misho 1: /*
2: * $Id: icmp_redirect.c,v 1.3 2004/03/16 18:40:58 mike Exp $
3: *
4: * libnet 1.1
5: * Build an ICMP redirect packet
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * Copyright (c) 2003 Alberto Ornaghi <alor@antifork.org>
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
40: main(int argc, char **argv)
41: {
42: int c;
43: libnet_t *l;
44: libnet_ptag_t t;
45: u_long src_ip, dst_ip, gw_ip;
46: u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
47: u_long payload_s = 8;
48: char errbuf[LIBNET_ERRBUF_SIZE];
49:
50: printf("libnet 1.1 packet shaping: ICMP redirect[link]\n");
51:
52: /*
53: * Initialize the library. Root priviledges are required.
54: */
55: l = libnet_init(
56: LIBNET_LINK, /* injection type */
57: NULL, /* network interface */
58: errbuf); /* errbuf */
59:
60: if (l == NULL)
61: {
62: fprintf(stderr, "libnet_init() failed: %s", errbuf);
63: exit(EXIT_FAILURE);
64: }
65:
66: src_ip = 0;
67: dst_ip = 0;
68: gw_ip = 0;
69: while((c = getopt(argc, argv, "d:s:g:")) != EOF)
70: {
71: switch (c)
72: {
73: case 'd':
74: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
75: {
76: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
77: exit(1);
78: }
79: break;
80: case 's':
81: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
82: {
83: fprintf(stderr, "Bad source IP address: %s\n", optarg);
84: exit(1);
85: }
86: break;
87: case 'g':
88: if ((gw_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
89: {
90: fprintf(stderr, "Bad gateway IP address: %s\n", optarg);
91: exit(1);
92: }
93: break;
94: }
95: }
96: if (!src_ip || !dst_ip || !gw_ip)
97: {
98: usage(argv[0]);
99: exit(EXIT_FAILURE);
100: }
101:
102: t = libnet_build_ipv4(
103: LIBNET_IPV4_H + payload_s, /* length */
104: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
105: 0x42, /* IP ID */
106: 0, /* IP Frag */
107: 64, /* TTL */
108: IPPROTO_ICMP, /* protocol */
109: 0, /* checksum */
110: dst_ip, /* source IP */
111: src_ip, /* destination IP */
112: payload, /* payload */
113: payload_s, /* payload size */
114: l, /* libnet handle */
115: 0);
116: if (t == -1)
117: {
118: fprintf(stderr, "Can't build error IP header: %s\n",
119: libnet_geterror(l));
120: goto bad;
121: }
122:
123: t = libnet_build_icmpv4_redirect(
124: ICMP_REDIRECT, /* type */
125: ICMP_REDIRECT_HOST, /* code */
126: 0, /* checksum */
127: gw_ip,
128: NULL,
129: 0,
130: l, /* libnet handle */
131: 0); /* libnet id */
132: if (t == -1)
133: {
134: fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l));
135: goto bad;
136: }
137:
138: t = libnet_build_ipv4(
139: LIBNET_IPV4_H + LIBNET_ICMPV4_REDIRECT_H +
140: LIBNET_IPV4_H + payload_s, /* length */
141: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
142: 0xee, /* IP ID */
143: 0, /* IP Frag */
144: 64, /* TTL */
145: IPPROTO_ICMP, /* protocol */
146: 0, /* checksum */
147: src_ip, /* source IP */
148: dst_ip, /* destination IP */
149: NULL, /* payload */
150: 0, /* payload size */
151: l, /* libnet handle */
152: 0);
153: if (t == -1)
154: {
155: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
156: goto bad;
157: }
158:
159: t = libnet_build_ethernet(
160: enet_dst, /* ethernet destination */
161: enet_src, /* ethernet source */
162: ETHERTYPE_IP, /* protocol type */
163: NULL, /* payload */
164: 0, /* payload size */
165: l, /* libnet handle */
166: 0); /* libnet id */
167: if (t == -1)
168: {
169: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
170: goto bad;
171: }
172:
173: /*
174: * Write it to the wire.
175: */
176: c = libnet_write(l);
177: if (c == -1)
178: {
179: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
180: goto bad;
181: }
182: else
183: {
184: fprintf(stderr, "Wrote %d byte ICMP packet; check the wire.\n", c);
185: }
186: libnet_destroy(l);
187: return (EXIT_SUCCESS);
188: bad:
189: libnet_destroy(l);
190: return (EXIT_FAILURE);
191: }
192:
193:
194: void
195: usage(char *name)
196: {
197: fprintf(stderr, "usage: %s -s source_ip -d destination_ip -g gateway_ip\n ", name);
198: }
199: