2 * $Id: tcp+data.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
5 * TCP Packet assembly tester (with payload)
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;
45 u_char *payload = "hello world";
46 int payload_s = strlen(payload);
48 printf("TCP + payload packet building/writing test\n");
54 while((c = getopt(argc, argv, "d:s:")) != EOF)
59 * We expect the input to be of the form `ip.ip.ip.ip.port`. We
60 * point cp to the last dot of the IP address/port string and
61 * then seperate them with a NULL byte. The optarg now points to
62 * just the IP address, and cp points to the port.
65 if (!(cp = strrchr(optarg, '.')))
70 dst_prt = (u_short)atoi(cp);
71 if (!(dst_ip = libnet_name_resolve(optarg, 1)))
73 fprintf(stderr, "Bad destination IP address: %s\n", optarg);
78 if (!(cp = strrchr(optarg, '.')))
83 src_prt = (u_short)atoi(cp);
84 if (!(src_ip = libnet_name_resolve(optarg, 1)))
86 fprintf(stderr, "Bad source IP address: %s\n", optarg);
93 if (!src_ip || !src_prt || !dst_ip || !dst_prt)
100 * Get our block of memory for the packet. This time, we need memory
101 * for the packet headers and payload.
103 buf = malloc(LIBNET_TCP_H + LIBNET_IP_H + payload_s);
106 perror("No memory for packet");
111 * Open our raw IP socket and set IP_HDRINCL.
113 sock = libnet_open_raw_sock(IPPROTO_RAW);
121 * Build the IP header (shown exploded for commenting).
123 libnet_build_ip(LIBNET_TCP_H + payload_s, /* Size of the payload */
128 IPPROTO_TCP, /* Transport protocol */
129 src_ip, /* Source IP */
130 dst_ip, /* Destination IP */
131 NULL, /* Pointer to payload (none) */
133 buf); /* Packet header memory */
136 * Build the TCP header.
138 libnet_build_tcp(src_prt, /* Source TCP port */
139 dst_prt, /* Destination TCP port */
140 11111, /* Sequence number */
141 99999, /* Acknowledgement number */
142 TH_SYN|TH_ACK, /* Control flags */
143 1024, /* Window size */
144 0, /* Urgent pointer */
145 payload, /* Pointer to payload */
146 payload_s, /* Payload size */
147 buf + LIBNET_IP_H); /* Packet header memory */
150 * Calculate the TCP header checksum (IP header checksum is *always* done
153 libnet_do_checksum(buf, IPPROTO_TCP, LIBNET_TCP_H + payload_s);
156 * Write the packet to the network.
158 c = libnet_write_ip(sock, buf, LIBNET_TCP_H + LIBNET_IP_H + payload_s);
159 if (c < LIBNET_TCP_H + LIBNET_IP_H + payload_s)
161 fprintf(stderr, "libnet_write_ip\n");
163 printf("Completed, wrote %d bytes\n", c);
166 return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
174 "usage: %s -s source_ip.source_port -d destination_ip.destination_port\n",