1: /*
2: * $Id: icmp_unreach.c,v 1.1.1.3 2023/09/27 11:11:38 misho Exp $
3: *
4: * libnet 1.1
5: * Build an ICMP unreachable packet
6: *
7: * Hacked by Frederic Raynal <pappy@security-labs.org> to illustrate
8: * the new API of ICMP error messages fixing Aaron's bugs.
9: *
10: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
11: * All rights reserved.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
34: */
35:
36: #if (HAVE_CONFIG_H)
37: #include "../include/config.h"
38: #endif
39: #include "./libnet_test.h"
40:
41: int
42: main(int argc, char **argv)
43: {
44: int c, i;
45: libnet_t *l = NULL;
46: libnet_ptag_t ip_err = 0, icmp = 0, ip = 0, eth = 0;
47: u_long src_ip, dst_ip;
48: u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
49: u_long payload_s = 8;
50: int mode = LIBNET_LINK;
51: char errbuf[LIBNET_ERRBUF_SIZE];
52:
53: printf("libnet 1.1 packet shaping: ICMP unreachable[link]\n");
54:
55: src_ip = 0;
56: dst_ip = 0;
57:
58: while((c = getopt(argc, argv, "d:s:r")) != EOF)
59: {
60: switch (c)
61: {
62: case 'd':
63: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
64: {
65: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
66: exit(1);
67: }
68: break;
69: case 's':
70: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
71: {
72: fprintf(stderr, "Bad source IP address: %s\n", optarg);
73: exit(1);
74: }
75: break;
76: case 'r':
77: mode = LIBNET_RAW4;
78: break;
79: }
80: }
81: if (!src_ip || !dst_ip)
82: {
83: usage(argv[0]);
84: exit(EXIT_FAILURE);
85: }
86:
87: /*
88: * Initialize the library. Root priviledges are required.
89: */
90: l = libnet_init(
91: mode, /* injection type */
92: NULL, /* network interface */
93: errbuf); /* errbuf */
94:
95: if (l == NULL)
96: {
97: fprintf(stderr, "libnet_init() failed: %s", errbuf);
98: exit(EXIT_FAILURE);
99: }
100:
101: for (i=0; i<255; i++)
102: {
103: ip_err = libnet_build_ipv4(
104: LIBNET_IPV4_H + payload_s, /* o length */
105: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* o IP tos */
106: (uint16_t)i, /* o IP ID */
107: 0, /* o frag */
108: 64, /* o TTL */
109: IPPROTO_UDP, /* o protocol */
110: 0, /* o checksum */
111: dst_ip, /* o source IP */
112: src_ip, /* o destination IP */
113: payload, /* payload */
114: payload_s, /* payload size */
115: l,
116: ip_err);
117: if (ip_err == -1)
118: {
119: fprintf(stderr, "Can't build error IPv4 header: %s\n",
120: libnet_geterror(l));
121: goto bad;
122: }
123:
124: icmp = libnet_build_icmpv4_unreach(
125: ICMP_UNREACH, /* type */
126: ICMP_UNREACH_PORT, /* code */
127: 0, /* checksum */
128: NULL, /* payload */
129: 0, /* payload size */
130: l, /* libnet handle */
131: icmp);
132: if (icmp == -1)
133: {
134: fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l));
135: goto bad;
136: }
137:
138: ip = libnet_build_ipv4(
139: LIBNET_IPV4_H + LIBNET_ICMPV4_UNREACH_H +
140: LIBNET_IPV4_H + payload_s, /* length */
141: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
142: (uint16_t)i + 1, /* 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: ip);
153: if (ip == -1)
154: {
155: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
156: goto bad;
157: }
158:
159: if (mode == LIBNET_LINK) {
160: eth = libnet_build_ethernet(
161: enet_dst, /* ethernet destination */
162: enet_src, /* ethernet source */
163: ETHERTYPE_IP, /* protocol type */
164: NULL, /* payload */
165: 0, /* payload size */
166: l, /* libnet handle */
167: eth); /* libnet id */
168:
169: if (eth == -1)
170: {
171: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
172: goto bad;
173: }
174: }
175: /*
176: * Write it to the wire.
177: */
178: libnet_diag_dump_pblock(l);
179: c = libnet_write(l);
180: if (c == -1)
181: {
182: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
183: goto bad;
184: }
185: else
186: {
187: fprintf(stderr, "Wrote %d byte ICMP packet; check the wire.\n", c);
188: }
189: }
190: libnet_destroy(l);
191: return (EXIT_SUCCESS);
192: bad:
193: libnet_destroy(l);
194: return (EXIT_FAILURE);
195: }
196:
197:
198: void
199: usage(char *name)
200: {
201: fprintf(stderr, "usage: %s [-r] -s source_ip -d destination_ip\n ", name);
202: }
203:
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