1: /*
2: * $Id: udp1.c,v 1.1.1.2 2013/07/22 11:54:41 misho 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: #if (HAVE_CONFIG_H)
34: #include "../include/config.h"
35: #endif
36: #include "./libnet_test.h"
37: #ifdef __WIN32__
38: #include "../include/win32/getopt.h"
39: #endif
40:
41: int
42: main(int argc, char *argv[])
43: {
44: int c, i, j, build_ip;
45: char *cp;
46: libnet_t *l;
47: libnet_ptag_t ip, ipo;
48: libnet_ptag_t udp;
49: char *payload;
50: u_short payload_s;
51: struct libnet_stats ls;
52: u_long src_ip, dst_ip;
53: u_short src_prt, dst_prt;
54: u_char opt[20];
55: char errbuf[LIBNET_ERRBUF_SIZE];
56:
57: printf("libnet 1.1 packet shaping: UDP + IP options[raw]\n");
58:
59: /*
60: * Initialize the library. Root priviledges are required.
61: */
62: l = libnet_init(
63: LIBNET_RAW4, /* injection type */
64: NULL, /* network interface */
65: errbuf); /* errbuf */
66:
67: if (l == NULL)
68: {
69: fprintf(stderr, "libnet_init() failed: %s\n", errbuf);
70: exit(EXIT_FAILURE);
71: }
72:
73: src_ip = 0;
74: dst_ip = 0;
75: src_prt = 0;
76: dst_prt = 0;
77: payload = NULL;
78: payload_s = 0;
79: ip = ipo = udp = 0;
80: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
81: {
82: switch (c)
83: {
84: /*
85: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
86: * point cp to the last dot of the IP address/port string and
87: * then seperate them with a NULL byte. The optarg now points to
88: * just the IP address, and cp points to the port.
89: */
90: case 'd':
91: if (!(cp = strrchr(optarg, '.')))
92: {
93: usage(argv[0]);
94: }
95: *cp++ = 0;
96: dst_prt = (u_short)atoi(cp);
97: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
98: {
99: fprintf(stderr, "Bad destination IP address: %s\n", optarg); exit(EXIT_FAILURE);
100: }
101: break;
102: case 's':
103: if (!(cp = strrchr(optarg, '.')))
104: {
105: usage(argv[0]);
106: }
107: *cp++ = 0;
108: src_prt = (u_short)atoi(cp);
109: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
110: {
111: fprintf(stderr, "Bad source IP address: %s\n", optarg);
112: exit(EXIT_FAILURE);
113: }
114: break;
115: case 'p':
116: payload = optarg;
117: payload_s = strlen(payload);
118: break;
119: default:
120: exit(EXIT_FAILURE);
121: }
122: }
123:
124: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
125: {
126: usage(argv[0]);
127: exit(EXIT_FAILURE);
128: }
129:
130: for (build_ip = 0, i = 0; i < 10; i++)
131: {
132: udp = libnet_build_udp(
133: src_prt, /* source port */
134: dst_prt + i, /* destination port */
135: LIBNET_UDP_H + payload_s, /* packet length */
136: 0, /* checksum */
137: (uint8_t*)payload, /* payload */
138: payload_s, /* payload size */
139: l, /* libnet handle */
140: udp); /* libnet id */
141: if (udp == -1)
142: {
143: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
144: goto bad;
145: }
146:
147: if (1)
148: {
149: build_ip = 0;
150: /* this is not a legal options string */
151: for (j = 0; j < 20; j++)
152: {
153: opt[j] = libnet_get_prand(LIBNET_PR2);
154: }
155: ipo = libnet_build_ipv4_options(
156: opt,
157: 20,
158: l,
159: ipo);
160: if (ipo == -1)
161: {
162: fprintf(stderr, "Can't build IP options: %s\n", libnet_geterror(l));
163: goto bad;
164: }
165:
166: ip = libnet_build_ipv4(
167: LIBNET_IPV4_H + 20 + payload_s + LIBNET_UDP_H, /* length */
168: 0, /* TOS */
169: 242, /* IP ID */
170: 0, /* IP Frag */
171: 64, /* TTL */
172: IPPROTO_UDP, /* protocol */
173: 0, /* checksum */
174: src_ip,
175: dst_ip,
176: NULL, /* payload */
177: 0, /* payload size */
178: l, /* libnet handle */
179: ip); /* libnet id */
180: if (ip == -1)
181: {
182: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
183: goto bad;
184: }
185: }
186:
187: /*
188: * Write it to the wire.
189: */
190: fprintf(stderr, "%d byte packet, ready to go\n",
191: libnet_getpacket_size(l));
192: c = libnet_write(l);
193: if (c == -1)
194: {
195: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
196: goto bad;
197: }
198: else
199: {
200: fprintf(stderr, "Wrote %d byte UDP packet; check the wire.\n", c);
201: }
202: }
203: libnet_stats(l, &ls);
204: fprintf(stderr, "Packets sent: %lld\n"
205: "Packet errors: %lld\n"
206: "Bytes written: %lld\n",
207: ls.packets_sent, ls.packet_errors, ls.bytes_written);
208: libnet_destroy(l);
209: return (EXIT_SUCCESS);
210: bad:
211: libnet_destroy(l);
212: return (EXIT_FAILURE);
213: }
214:
215: void
216: usage(char *name)
217: {
218: fprintf(stderr,
219: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
220: " [-p payload]\n",
221: name);
222: }
223: /* EOF */
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