2 * $Id: tcp.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
5 * tcp.c - Build a TCP packet at the link layer
7 * Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 #include "../../include/config.h"
36 #include "../libnet_test.h"
39 main(int argc, char *argv[])
42 u_long src_ip, dst_ip;
43 u_short src_prt, dst_prt;
47 struct libnet_link_int *l;
49 printf("link layer TCP packet building/writing test\n");
55 while ((c = getopt(argc, argv, "i:d:s:")) != EOF)
60 * We expect the input to be of the form `ip.ip.ip.ip.port`. We
61 * point cp to the last dot of the IP address/port string and
62 * then seperate them with a NULL byte. The optarg now points to
63 * just the IP address, and cp points to the port.
66 if (!(cp = strrchr(optarg, '.')))
71 dst_prt = (u_short)atoi(cp);
72 if (!(dst_ip = libnet_name_resolve(optarg, 1)))
74 fprintf(stderr, "Bad destination IP address: %s\n", optarg);
79 if (!(cp = strrchr(optarg, '.')))
84 src_prt = (u_short)atoi(cp);
85 if (!(src_ip = libnet_name_resolve(optarg, 1)))
87 fprintf(stderr, "Bad source IP address: %s\n", optarg);
99 if (!src_ip || !src_prt || !dst_ip || !dst_prt || !device)
105 if ((l = libnet_open_link_interface(device, errbuf)) == NULL)
107 fprintf(stderr, "libnet_open_link_interface: %s\n", errbuf);
110 c = send_tcp(l, device, src_ip, src_prt, dst_ip, dst_prt);
112 return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
117 send_tcp(struct libnet_link_int *l, u_char *device, u_long src_ip, u_short
118 src_prt, u_long dst_ip, u_short dst_prt)
123 if (libnet_init_packet(LIBNET_TCP_H + LIBNET_IP_H + LIBNET_ETH_H,
126 perror("no packet memory");
133 libnet_build_ethernet(enet_dst, enet_src, ETHERTYPE_IP, NULL, 0, buf);
135 libnet_build_ip(LIBNET_TCP_H,
147 libnet_build_tcp(src_prt,
156 buf + LIBNET_IP_H + LIBNET_ETH_H);
158 libnet_do_checksum(buf + LIBNET_ETH_H, IPPROTO_IP, LIBNET_IP_H);
159 libnet_do_checksum(buf + LIBNET_ETH_H, IPPROTO_TCP, LIBNET_TCP_H);
161 n = libnet_write_link_layer(l, device, buf, LIBNET_ETH_H + LIBNET_IP_H
163 if (n != LIBNET_ETH_H + LIBNET_IP_H + LIBNET_TCP_H)
165 fprintf(stderr, "Oopz. Only wrote %d bytes\n", n);
169 printf("Wrote %d byte TCP packet through linktype %d\n", n, l->linktype);
171 libnet_destroy_packet(&buf);
179 "usage: %s -i interface -s source_ip.source_port"
180 " -d destination_ip.destination_port\n",