![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to tcp1.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / sample|
Return to tcp1.c CVS log | Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / sample |
1.1 misho 1: /*
2: * $Id: tcp1.c,v 1.6 2004/03/01 20:26:12 mike Exp $
3: *
4: * libnet 1.1
5: * Build a TCP 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;
45: u_char *cp;
46: libnet_t *l;
47: libnet_ptag_t t;
48: char *payload;
49: u_short payload_s;
50: u_long src_ip, dst_ip;
51: u_short src_prt, dst_prt;
52: char errbuf[LIBNET_ERRBUF_SIZE];
53:
54: printf("libnet 1.1 packet shaping: TCP + options[link]\n");
55:
56: /*
57: * Initialize the library. Root priviledges are required.
58: */
59: l = libnet_init(
60: LIBNET_LINK, /* injection type */
61: NULL, /* network interface */
62: errbuf); /* error buffer */
63:
64: if (l == NULL)
65: {
66: fprintf(stderr, "libnet_init() failed: %s", errbuf);
67: exit(EXIT_FAILURE);
68: }
69:
70: src_ip = 0;
71: dst_ip = 0;
72: src_prt = 0;
73: dst_prt = 0;
74: payload = NULL;
75: payload_s = 0;
76: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
77: {
78: switch (c)
79: {
80: /*
81: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
82: * point cp to the last dot of the IP address/port string and
83: * then seperate them with a NULL byte. The optarg now points to
84: * just the IP address, and cp points to the port.
85: */
86: case 'd':
87: if (!(cp = strrchr(optarg, '.')))
88: {
89: usage(argv[0]);
90: }
91: *cp++ = 0;
92: dst_prt = (u_short)atoi(cp);
93: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
94: {
95: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
96: exit(EXIT_FAILURE);
97: }
98: break;
99: case 's':
100: if (!(cp = strrchr(optarg, '.')))
101: {
102: usage(argv[0]);
103: }
104: *cp++ = 0;
105: src_prt = (u_short)atoi(cp);
106: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
107: {
108: fprintf(stderr, "Bad source IP address: %s\n", optarg);
109: exit(EXIT_FAILURE);
110: }
111: break;
112: case 'p':
113: payload = optarg;
114: payload_s = strlen(payload);
115: break;
116: default:
117: exit(EXIT_FAILURE);
118: }
119: }
120:
121: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
122: {
123: usage(argv[0]);
124: exit(EXIT_FAILURE);
125: }
126:
127: t = libnet_build_tcp_options(
128: "\003\003\012\001\002\004\001\011\010\012\077\077\077\077\000\000\000\000\000\000",
129: 20,
130: l,
131: 0);
132: if (t == -1)
133: {
134: fprintf(stderr, "Can't build TCP options: %s\n", libnet_geterror(l));
135: goto bad;
136: }
137:
138: t = libnet_build_tcp(
139: src_prt, /* source port */
140: dst_prt, /* destination port */
141: 0x01010101, /* sequence number */
142: 0x02020202, /* acknowledgement num */
143: TH_SYN, /* control flags */
144: 32767, /* window size */
145: 0, /* checksum */
146: 10, /* urgent pointer */
147: LIBNET_TCP_H + 20 + payload_s, /* TCP packet size */
148: payload, /* payload */
149: payload_s, /* payload size */
150: l, /* libnet handle */
151: 0); /* libnet id */
152: if (t == -1)
153: {
154: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
155: goto bad;
156: }
157:
158: t = libnet_build_ipv4(
159: LIBNET_IPV4_H + LIBNET_TCP_H + 20 + payload_s,/* length */
160: 0, /* TOS */
161: 242, /* IP ID */
162: 0, /* IP Frag */
163: 64, /* TTL */
164: IPPROTO_TCP, /* protocol */
165: 0, /* checksum */
166: src_ip, /* source IP */
167: dst_ip, /* destination IP */
168: NULL, /* payload */
169: 0, /* payload size */
170: l, /* libnet handle */
171: 0); /* libnet id */
172: if (t == -1)
173: {
174: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
175: goto bad;
176: }
177:
178: t = libnet_build_ethernet(
179: enet_dst, /* ethernet destination */
180: enet_src, /* ethernet source */
181: ETHERTYPE_IP, /* protocol type */
182: NULL, /* payload */
183: 0, /* payload size */
184: l, /* libnet handle */
185: 0); /* libnet id */
186: if (t == -1)
187: {
188: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
189: goto bad;
190: }
191:
192: /*
193: * Write it to the wire.
194: */
195: c = libnet_write(l);
196: if (c == -1)
197: {
198: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
199: goto bad;
200: }
201: else
202: {
203: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
204: }
205:
206: libnet_destroy(l);
207: return (EXIT_SUCCESS);
208: bad:
209: libnet_destroy(l);
210: return (EXIT_FAILURE);
211: }
212:
213: void
214: usage(char *name)
215: {
216: fprintf(stderr,
217: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
218: " [-p payload]\n",
219: name);
220: }
221:
222: #if defined(__WIN32__)
223: #include <../include/win32/getopt.h>
224: #include <winsock2.h>
225: #include <ws2tcpip.h>
226: #endif /* __WIN32__ */
227: /* EOF */