1: /*
2: *
3: * libnet 1.1
4: * Build a BGP4 update message with what you want as payload
5: *
6: * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org>
7: * All rights reserved.
8: *
9: * Examples:
10: *
11: * empty BGP UPDATE message:
12: *
13: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2
14: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
15: * Wrote 63 byte TCP packet; check the wire.
16: *
17: * 13:44:29.216135 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
18: * 16843009:16843032(23) win 32767: BGP (ttl 64, id 242, len 63)
19: * 0x0000 4500 003f 00f2 0000 4006 73c2 0101 0101 E..?....@.s.....
20: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
21: * 0x0020 5002 7fff b288 0000 0101 0101 0101 0101 P...............
22: * 0x0030 0101 0101 0101 0101 0017 0200 0000 00 ...............
23: *
24: *
25: * BGP UPDATE with Path Attributes and Unfeasible Routes Length
26: *
27: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2 -a `printf "\x01\x02\x03"` -A 3 -W 13
28: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
29: * Wrote 79 byte TCP packet; check the wire.
30: *
31: * 13:45:59.579901 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
32: * 16843009:16843048(39) win 32767: BGP (ttl 64, id 242, len 79)
33: * 0x0000 4500 004f 00f2 0000 4006 73b2 0101 0101 E..O....@.s.....
34: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
35: * 0x0020 5002 7fff 199b 0000 0101 0101 0101 0101 P...............
36: * 0x0030 0101 0101 0101 0101 0027 0200 0d41 4141 .........'...AAA
37: * 0x0040 4141 4141 4141 4141 4141 0003 0102 03 AAAAAAAAAA.....
38: *
39: *
40: * BGP UPDATE with Reachability Information
41: *
42: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2 -I 7
43: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
44: * Wrote 70 byte TCP packet; check the wire.
45: *
46: * 13:49:02.829225 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
47: * 16843009:16843039(30) win 32767: BGP (ttl 64, id 242, len 70)
48: * 0x0000 4500 0046 00f2 0000 4006 73bb 0101 0101 E..F....@.s.....
49: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
50: * 0x0020 5002 7fff e86d 0000 0101 0101 0101 0101 P....m..........
51: * 0x0030 0101 0101 0101 0101 001e 0200 0000 0043 ...............C
52: * 0x0040 4343 4343 4343 CCCCCC
53: *
54: *
55: * Redistribution and use in source and binary forms, with or without
56: * modification, are permitted provided that the following conditions
57: * are met:
58: * 1. Redistributions of source code must retain the above copyright
59: * notice, this list of conditions and the following disclaimer.
60: * 2. Redistributions in binary form must reproduce the above copyright
61: * notice, this list of conditions and the following disclaimer in the
62: * documentation and/or other materials provided with the distribution.
63: *
64: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
65: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
66: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
67: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
68: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
69: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
70: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
71: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
72: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
73: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
74: * SUCH DAMAGE.
75: *
76: */
77: #if (HAVE_CONFIG_H)
78: #include "../include/config.h"
79: #endif
80: #include "./libnet_test.h"
81:
82:
83: #define set_ptr_and_size(ptr, size, val, flag) \
84: if (size && !ptr) \
85: { \
86: ptr = (u_char *)malloc(size); \
87: if (!ptr) \
88: { \
89: printf("memory allocation failed (%u bytes requested)\n", size); \
90: goto bad; \
91: } \
92: memset(ptr, val, size); \
93: flag = 1; \
94: } \
95: \
96: if (ptr && !size) \
97: { \
98: size = strlen((char *)ptr); \
99: }
100:
101:
102:
103: int
104: main(int argc, char *argv[])
105: {
106: int c;
107: libnet_t *l;
108: u_long src_ip, dst_ip, length;
109: libnet_ptag_t t = 0;
110: char errbuf[LIBNET_ERRBUF_SIZE];
111: u_char *payload = NULL;
112: u_long payload_s = 0;
113: u_char marker[LIBNET_BGP4_MARKER_SIZE];
114:
115: u_short u_rt_l = 0;
116: u_char *withdraw_rt = NULL;
117: char flag_w = 0;
118: u_short attr_l = 0;
119: u_char *attr = NULL;
120: char flag_a = 0;
121: u_short info_l = 0;
122: u_char *info = NULL;
123: char flag_i = 0;
124:
125: printf("libnet 1.1 packet shaping: BGP4 update + payload[raw]\n");
126:
127: /*
128: * Initialize the library. Root priviledges are required.
129: */
130: l = libnet_init(
131: LIBNET_RAW4, /* injection type */
132: NULL, /* network interface */
133: errbuf); /* error buffer */
134:
135: if (l == NULL)
136: {
137: fprintf(stderr, "libnet_init() failed: %s", errbuf);
138: exit(EXIT_FAILURE);
139: }
140:
141: src_ip = 0;
142: dst_ip = 0;
143: memset(marker, 0x1, LIBNET_BGP4_MARKER_SIZE);
144:
145: while ((c = getopt(argc, argv, "d:s:t:m:p:w:W:a:A:i:I:")) != EOF)
146: {
147: switch (c)
148: {
149: /*
150: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
151: * point cp to the last dot of the IP address/port string and
152: * then seperate them with a NULL byte. The optarg now points to
153: * just the IP address, and cp points to the port.
154: */
155: case 'd':
156: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
157: {
158: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
159: exit(EXIT_FAILURE);
160: }
161: break;
162:
163: case 's':
164: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
165: {
166: fprintf(stderr, "Bad source IP address: %s\n", optarg);
167: exit(EXIT_FAILURE);
168: }
169: break;
170:
171: case 'p':
172: payload = (u_char *)optarg;
173: payload_s = strlen((char *)payload);
174: break;
175:
176: case 'w':
177: withdraw_rt = (u_char *)optarg;
178: break;
179:
180: case 'W':
181: u_rt_l = atoi(optarg);
182: break;
183:
184: case 'a':
185: attr = (u_char *)optarg;
186: break;
187:
188: case 'A':
189: attr_l = atoi(optarg);
190: break;
191:
192: case 'i':
193: info = (u_char *)optarg;
194: break;
195:
196: case 'I':
197: info_l = atoi(optarg);
198: break;
199:
200: default:
201: exit(EXIT_FAILURE);
202: }
203: }
204:
205: if (!src_ip || !dst_ip)
206: {
207: usage(argv[0]);
208: goto bad;
209: }
210:
211: set_ptr_and_size(withdraw_rt, u_rt_l, 0x41, flag_w);
212: set_ptr_and_size(attr, attr_l, 0x42, flag_a);
213: set_ptr_and_size(info, info_l, 0x43, flag_i);
214:
215: /*
216: * BGP4 update messages are "dynamic" are fields have variable size. The only
217: * sizes we know are those for the 2 first fields ... so we need to count them
218: * plus their value.
219: */
220: length = LIBNET_BGP4_UPDATE_H + u_rt_l + attr_l + info_l + payload_s;
221: t = libnet_build_bgp4_update(
222: u_rt_l, /* Unfeasible Routes Length */
223: withdraw_rt, /* Withdrawn Routes */
224: attr_l, /* Total Path Attribute Length */
225: attr, /* Path Attributes */
226: info_l, /* Network Layer Reachability Information length */
227: info, /* Network Layer Reachability Information */
228: payload, /* payload */
229: payload_s, /* payload size */
230: l, /* libnet handle */
231: 0); /* libnet id */
232: if (t == -1)
233: {
234: fprintf(stderr, "Can't build BGP4 update header: %s\n", libnet_geterror(l));
235: goto bad;
236: }
237:
238: length+=LIBNET_BGP4_HEADER_H;
239: t = libnet_build_bgp4_header(
240: marker, /* marker */
241: length, /* length */
242: LIBNET_BGP4_UPDATE, /* message type */
243: NULL, /* payload */
244: 0, /* payload size */
245: l, /* libnet handle */
246: 0); /* libnet id */
247: if (t == -1)
248: {
249: fprintf(stderr, "Can't build BGP4 header: %s\n", libnet_geterror(l));
250: goto bad;
251: }
252:
253: length+=LIBNET_TCP_H;
254: t = libnet_build_tcp(
255: 0x6666, /* source port */
256: 179, /* destination port */
257: 0x01010101, /* sequence number */
258: 0x02020202, /* acknowledgement num */
259: TH_SYN, /* control flags */
260: 32767, /* window size */
261: 0, /* checksum */
262: 0, /* urgent pointer */
263: length, /* TCP packet size */
264: NULL, /* payload */
265: 0, /* payload size */
266: l, /* libnet handle */
267: 0); /* libnet id */
268: if (t == -1)
269: {
270: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
271: goto bad;
272: }
273:
274: length+=LIBNET_IPV4_H;
275: t = libnet_build_ipv4(
276: length, /* length */
277: 0, /* TOS */
278: 242, /* IP ID */
279: 0, /* IP Frag */
280: 64, /* TTL */
281: IPPROTO_TCP, /* protocol */
282: 0, /* checksum */
283: src_ip, /* source IP */
284: dst_ip, /* destination IP */
285: NULL, /* payload */
286: 0, /* payload size */
287: l, /* libnet handle */
288: 0); /* libnet id */
289: if (t == -1)
290: {
291: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
292: goto bad;
293: }
294:
295: /*
296: * Write it to the wire.
297: */
298: c = libnet_write(l);
299: if (c == -1)
300: {
301: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
302: goto bad;
303: }
304: else
305: {
306: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
307: }
308:
309: if (flag_w) free(withdraw_rt);
310: if (flag_a) free(attr);
311: if (flag_i) free(info);
312:
313: libnet_destroy(l);
314: return (EXIT_SUCCESS);
315: bad:
316: if (flag_w) free(withdraw_rt);
317: if (flag_a) free(attr);
318: if (flag_i) free(info);
319:
320: libnet_destroy(l);
321: return (EXIT_FAILURE);
322: }
323:
324: void
325: usage(char *name)
326: {
327: fprintf(stderr,
328: "usage: %s -s source_ip -d destination_ip \n"
329: " [-m marker] [-p payload] [-S payload size]\n"
330: " [-w Withdrawn Routes] [-W Unfeasible Routes Length]\n"
331: " [-a Path Attributes] [-A Attribute Length]\n"
332: " [-i Reachability Information] [-I Reachability Information length]\n",
333: name);
334: }
335:
336:
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