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1.1 misho 1: /*
2: * $Id: udp1.c,v 1.6 2004/03/01 20:26:12 mike Exp $
3: *
4: * libnet 1.1
5: * Build a UDP packet
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * All rights reserved.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
31: */
32:
33: #include "./libnet_test.h"
34:
35: int
36: main(int argc, char *argv[])
37: {
38: int c, i, j, build_ip;
1.1.1.2 misho 39: char *cp;
1.1 misho 40: libnet_t *l;
41: libnet_ptag_t ip, ipo;
42: libnet_ptag_t udp;
43: char *payload;
44: u_short payload_s;
45: struct libnet_stats ls;
46: u_long src_ip, dst_ip;
47: u_short src_prt, dst_prt;
48: u_char opt[20];
49: char errbuf[LIBNET_ERRBUF_SIZE];
50:
51: printf("libnet 1.1 packet shaping: UDP + IP options[raw]\n");
52:
53: /*
54: * Initialize the library. Root priviledges are required.
55: */
56: l = libnet_init(
57: LIBNET_RAW4, /* injection type */
58: NULL, /* network interface */
59: errbuf); /* errbuf */
60:
61: if (l == NULL)
62: {
63: fprintf(stderr, "libnet_init() failed: %s\n", errbuf);
64: exit(EXIT_FAILURE);
65: }
66:
67: src_ip = 0;
68: dst_ip = 0;
69: src_prt = 0;
70: dst_prt = 0;
71: payload = NULL;
72: payload_s = 0;
73: ip = ipo = udp = 0;
74: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
75: {
76: switch (c)
77: {
78: /*
79: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
80: * point cp to the last dot of the IP address/port string and
81: * then seperate them with a NULL byte. The optarg now points to
82: * just the IP address, and cp points to the port.
83: */
84: case 'd':
85: if (!(cp = strrchr(optarg, '.')))
86: {
87: usage(argv[0]);
88: }
89: *cp++ = 0;
90: dst_prt = (u_short)atoi(cp);
91: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
92: {
93: fprintf(stderr, "Bad destination IP address: %s\n", optarg); exit(EXIT_FAILURE);
94: }
95: break;
96: case 's':
97: if (!(cp = strrchr(optarg, '.')))
98: {
99: usage(argv[0]);
100: }
101: *cp++ = 0;
102: src_prt = (u_short)atoi(cp);
103: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
104: {
105: fprintf(stderr, "Bad source IP address: %s\n", optarg);
106: exit(EXIT_FAILURE);
107: }
108: break;
109: case 'p':
110: payload = optarg;
111: payload_s = strlen(payload);
112: break;
113: default:
114: exit(EXIT_FAILURE);
115: }
116: }
117:
118: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
119: {
120: usage(argv[0]);
121: exit(EXIT_FAILURE);
122: }
123:
124: for (build_ip = 0, i = 0; i < 10; i++)
125: {
126: udp = libnet_build_udp(
127: src_prt, /* source port */
128: dst_prt + i, /* destination port */
129: LIBNET_UDP_H + payload_s, /* packet length */
130: 0, /* checksum */
1.1.1.2 misho 131: (uint8_t*)payload, /* payload */
1.1 misho 132: payload_s, /* payload size */
133: l, /* libnet handle */
134: udp); /* libnet id */
135: if (udp == -1)
136: {
137: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
138: goto bad;
139: }
140:
141: if (1)
142: {
143: build_ip = 0;
144: /* this is not a legal options string */
145: for (j = 0; j < 20; j++)
146: {
147: opt[j] = libnet_get_prand(LIBNET_PR2);
148: }
149: ipo = libnet_build_ipv4_options(
150: opt,
151: 20,
152: l,
153: ipo);
154: if (ipo == -1)
155: {
156: fprintf(stderr, "Can't build IP options: %s\n", libnet_geterror(l));
157: goto bad;
158: }
159:
160: ip = libnet_build_ipv4(
161: LIBNET_IPV4_H + 20 + payload_s + LIBNET_UDP_H, /* length */
162: 0, /* TOS */
163: 242, /* IP ID */
164: 0, /* IP Frag */
165: 64, /* TTL */
166: IPPROTO_UDP, /* protocol */
167: 0, /* checksum */
168: src_ip,
169: dst_ip,
170: NULL, /* payload */
171: 0, /* payload size */
172: l, /* libnet handle */
173: ip); /* libnet id */
174: if (ip == -1)
175: {
176: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
177: goto bad;
178: }
179: }
180:
181: /*
182: * Write it to the wire.
183: */
184: fprintf(stderr, "%d byte packet, ready to go\n",
185: libnet_getpacket_size(l));
186: c = libnet_write(l);
187: if (c == -1)
188: {
189: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
190: goto bad;
191: }
192: else
193: {
194: fprintf(stderr, "Wrote %d byte UDP packet; check the wire.\n", c);
195: }
196: }
197: libnet_stats(l, &ls);
198: fprintf(stderr, "Packets sent: %lld\n"
199: "Packet errors: %lld\n"
200: "Bytes written: %lld\n",
1.1.1.3 ! misho 201: (long long)ls.packets_sent, (long long)ls.packet_errors,
! 202: (long long)ls.bytes_written);
1.1 misho 203: libnet_destroy(l);
204: return (EXIT_SUCCESS);
205: bad:
206: libnet_destroy(l);
207: return (EXIT_FAILURE);
208: }
209:
210: void
211: usage(char *name)
212: {
213: fprintf(stderr,
214: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
215: " [-p payload]\n",
216: name);
217: }