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1.1 misho 1: /*
2: *
3: * libnet 1.1
4: * Build a BGP4 header with what you want as payload
5: *
6: * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org>
7: * All rights reserved.
8: *
9: *
10: * Example:
11: *
12: * Sending of a BGP KEEPALIVE
13: *
14: * # ./bgp4_hdr -s 1.1.1.1 -d 2.2.2.2 -t 4
15: * libnet 1.1 packet shaping: BGP4 hdr + payload[raw]
16: * Wrote 59 byte TCP packet; check the wire.
17: *
18: * 13:55:53.811579 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
19: * 16843009:16843028(19) win 32767: BGP (ttl 64, id 242, len 59)
20: * 0x0000 4500 003b 00f2 0000 4006 73c6 0101 0101 E..;....@.s.....
21: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
22: * 0x0020 5002 7fff b090 0000 0101 0101 0101 0101 P...............
23: * 0x0030 0101 0101 0101 0101 0013 04 ...........
24: *
25: *
26: * Redistribution and use in source and binary forms, with or without
27: * modification, are permitted provided that the following conditions
28: * are met:
29: * 1. Redistributions of source code must retain the above copyright
30: * notice, this list of conditions and the following disclaimer.
31: * 2. Redistributions in binary form must reproduce the above copyright
32: * notice, this list of conditions and the following disclaimer in the
33: * documentation and/or other materials provided with the distribution.
34: *
35: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
36: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
38: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
39: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
40: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
41: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
43: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
44: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45: * SUCH DAMAGE.
46: *
47: */
48: #if (HAVE_CONFIG_H)
49: #include "../include/config.h"
50: #endif
51: #include "./libnet_test.h"
52:
53: int
54: main(int argc, char *argv[])
55: {
56: int c;
57: libnet_t *l;
58: u_long src_ip, dst_ip, length;
59: libnet_ptag_t t = 0;
60: char errbuf[LIBNET_ERRBUF_SIZE];
61: u_char *payload = NULL;
62: u_long payload_s = 0;
63: u_char marker[LIBNET_BGP4_MARKER_SIZE];
64: u_char type;
65:
66: printf("libnet 1.1 packet shaping: BGP4 hdr + payload[raw]\n");
67:
68: /*
69: * Initialize the library. Root priviledges are required.
70: */
71: l = libnet_init(
72: LIBNET_RAW4, /* injection type */
73: NULL, /* network interface */
74: errbuf); /* error buffer */
75:
76: if (l == NULL)
77: {
78: fprintf(stderr, "libnet_init() failed: %s", errbuf);
79: exit(EXIT_FAILURE);
80: }
81:
82: src_ip = 0;
83: dst_ip = 0;
84: memset(marker, 0x1, LIBNET_BGP4_MARKER_SIZE);
85: type = 0;
86:
87: while ((c = getopt(argc, argv, "d:s:t:m:p:")) != EOF)
88: {
89: switch (c)
90: {
91: /*
92: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
93: * point cp to the last dot of the IP address/port string and
94: * then seperate them with a NULL byte. The optarg now points to
95: * just the IP address, and cp points to the port.
96: */
97: case 'd':
98: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
99: {
100: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
101: exit(EXIT_FAILURE);
102: }
103: break;
104:
105: case 's':
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:
113: case 'm':
114: memcpy(marker, optarg, LIBNET_BGP4_MARKER_SIZE);
115: break;
116:
117: case 't':
118: type = atoi(optarg);
119: break;
120:
121: case 'p':
122: payload = optarg;
123: payload_s = strlen(optarg);
124: break;
125:
126: default:
127: exit(EXIT_FAILURE);
128: }
129: }
130:
131: if (!src_ip || !dst_ip)
132: {
133: usage(argv[0]);
134: exit(EXIT_FAILURE);
135: }
136:
137:
138: length = LIBNET_BGP4_HEADER_H + payload_s;
139: t = libnet_build_bgp4_header(
140: marker, /* marker */
141: length, /* length */
142: type, /* message type */
143: payload, /* payload */
144: payload_s, /* payload size */
145: l, /* libnet handle */
146: 0); /* libnet id */
147: if (t == -1)
148: {
149: fprintf(stderr, "Can't build BGP4 header: %s\n", libnet_geterror(l));
150: goto bad;
151: }
152:
153: length+=LIBNET_TCP_H;
154: t = libnet_build_tcp(
155: 0x6666, /* source port */
156: 179, /* destination port */
157: 0x01010101, /* sequence number */
158: 0x02020202, /* acknowledgement num */
159: TH_SYN, /* control flags */
160: 32767, /* window size */
161: 0, /* checksum */
162: 0, /* urgent pointer */
163: length, /* TCP packet size */
164: NULL, /* payload */
165: 0, /* payload size */
166: l, /* libnet handle */
167: 0); /* libnet id */
168: if (t == -1)
169: {
170: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
171: goto bad;
172: }
173:
174: length+=LIBNET_IPV4_H;
175: t = libnet_build_ipv4(
176: length, /* length */
177: 0, /* TOS */
178: 242, /* IP ID */
179: 0, /* IP Frag */
180: 64, /* TTL */
181: IPPROTO_TCP, /* protocol */
182: 0, /* checksum */
183: src_ip, /* source IP */
184: dst_ip, /* destination IP */
185: NULL, /* payload */
186: 0, /* payload size */
187: l, /* libnet handle */
188: 0); /* libnet id */
189: if (t == -1)
190: {
191: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
192: goto bad;
193: }
194:
195: /*
196: * Write it to the wire.
197: */
198: c = libnet_write(l);
199: if (c == -1)
200: {
201: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
202: goto bad;
203: }
204: else
205: {
206: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
207: }
208:
209: libnet_destroy(l);
210: return (EXIT_SUCCESS);
211: bad:
212: libnet_destroy(l);
213: return (EXIT_FAILURE);
214: }
215:
216: void
217: usage(char *name)
218: {
219: fprintf(stderr,
220: "usage: %s -s source_ip -d destination_ip"
221: " [-m marker] [-p payload] [-t BGP type]\n",
222: name);
223: }
224:
225: /* EOF */