1: /*
2: *
3: * libnet 1.1
4: * Build a Sebek packet
5: *
6: * Copyright (c) 2004 Frederic Raynal <pappy@security-labs.org>
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28: * SUCH DAMAGE.
29: *
30: */
31:
32: #if (HAVE_CONFIG_H)
33: #if ((_WIN32) && !(__CYGWIN__))
34: #include "../include/win32/config.h"
35: #else
36: #include "../include/config.h"
37: #endif
38: #endif
39: #include "./libnet_test.h"
40:
41: void usage(char *name)
42: {
43: fprintf(stderr,
44: "usage: %s [-D eth_dst] [-s source_ip] [-d destination_ip]"
45: "[-u UDP port] [-m magic] [-v version] [-t type] [-S sec] [-U usec] [-P PID] [-I UID] [-f FD] [-c cmd]"
46: " [-i iface] [-p payload]\n",
47: name);
48:
49: }
50:
51:
52: int
53: main(int argc, char *argv[])
54: {
55: int c, port = 1101;
56: libnet_t *l;
57: char *device = NULL;
58: char *eth_dst = "11:11:11:11:11:11";
59: char *dst = "2.2.2.2", *src = "1.1.1.1";
60: u_long src_ip, dst_ip;
61: char errbuf[LIBNET_ERRBUF_SIZE];
62: libnet_ptag_t ptag = 0;
63: u_char *payload = 0;
64: char payload_flag = 0;
65: u_long payload_s = 0;
66: unsigned int magic = 0x0defaced,
67: counter = 0x12345678,
68: sec = 0, usec = 0,
69: pid = 1,
70: uid = 666,
71: fd = 2;
72: char *cmd = "./h4ckw0r1D";
73: unsigned int length = strlen(cmd)+1;
74: unsigned short version = SEBEK_PROTO_VERSION, type = SEBEK_TYPE_READ;
75:
76: printf("libnet 1.1 packet shaping: Sebek[link]\n");
77:
78:
79: /*
80: * handle options
81: */
82: while ((c = getopt(argc, argv, "D:d:s:u:m:v:t:S:U:P:I:f:c:p:i:h")) != EOF)
83: {
84: switch (c)
85: {
86: case 'D':
87: eth_dst = optarg;
88: break;
89: case 'd':
90: dst = optarg;
91: break;
92:
93: case 's':
94: src = optarg;
95: break;
96:
97: case 'i':
98: device = optarg;
99: break;
100:
101: case 'u':
102: port = atoi(optarg);
103: break;
104:
105: case 'm':
106: magic = strtoul(optarg, NULL, 10);
107: break;
108:
109: case 'v':
110: version = (unsigned short) strtoul(optarg, NULL, 10);
111: break;
112:
113: case 't':
114: type = (unsigned short) strtoul(optarg, NULL, 10);
115: break;
116:
117: case 'S':
118: sec = strtoul(optarg, NULL, 10);
119: break;
120:
121: case 'U':
122: usec = strtoul(optarg, NULL, 10);
123: break;
124:
125: case 'P':
126: pid = strtoul(optarg, NULL, 10);
127: break;
128:
129: case 'I':
130: uid = strtoul(optarg, NULL, 10);
131: break;
132:
133: case 'f':
134: fd = strtoul(optarg, NULL, 10);
135: break;
136:
137: case 'c':
138: cmd = optarg;
139: length = strlen(cmd);
140: break;
141:
142:
143: case 'p':
144: payload_flag = 1;
145: payload = optarg;
146: payload_s = strlen(payload);
147: break;
148:
149: case 'h':
150: usage(argv[0]);
151: exit(EXIT_SUCCESS);
152:
153: default:
154: exit(EXIT_FAILURE);
155: }
156: }
157:
158:
159: /*
160: * Initialize the library. Root priviledges are required.
161: */
162: l = libnet_init(
163: LIBNET_LINK_ADV, /* injection type */
164: device, /* network interface */
165: errbuf); /* error buffer */
166:
167: if (l == NULL)
168: {
169: fprintf(stderr, "libnet_init() failed: %s", errbuf);
170: exit(EXIT_FAILURE);
171: }
172:
173: printf("Using device %s\n", l->device);
174:
175: if (payload_flag)
176: {
177: memset(cmd, 0, sizeof(cmd));
178: memcpy(cmd, payload, (payload_s < 12 ? payload_s : 12));
179: length = payload_s;
180: }
181:
182:
183: if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == -1)
184: {
185: fprintf(stderr, "Bad destination IP address: %s\n", dst);
186: exit(EXIT_FAILURE);
187: }
188:
189: if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == -1)
190: {
191: fprintf(stderr, "Bad source IP address: %s\n", src);
192: exit(EXIT_FAILURE);
193: }
194:
195: if (!payload)
196: {
197: payload = cmd;
198: payload_s = length;
199: }
200:
201:
202: ptag = libnet_build_sebek(
203: magic,
204: version,
205: type,
206: counter,
207: sec,
208: usec,
209: pid,
210: uid,
211: fd,
212: cmd,
213: /* LIBNET_ETH_H + LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_SEBEK_H +*/ length,
214: payload,
215: payload_s,
216: l,
217: 0
218: );
219:
220: if (ptag == -1)
221: {
222: fprintf(stderr, "Can't build Sebek header: %s\n", libnet_geterror(l));
223: goto bad;
224: }
225:
226: ptag = libnet_build_udp(
227: port, /* source port */
228: port, /* destination port */
229: LIBNET_UDP_H + LIBNET_SEBEK_H + payload_s, /* packet length */
230: 0, /* checksum */
231: NULL, /* payload */
232: 0, /* payload size */
233: l, /* libnet handle */
234: 0); /* libnet id */
235:
236: if (ptag == -1)
237: {
238: fprintf(stderr, "Can't build UDP header: %s\n", libnet_geterror(l));
239: goto bad;
240: }
241:
242: ptag = libnet_build_ipv4(
243: LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_SEBEK_H + payload_s,/* length */
244: 0, /* TOS */
245: 242, /* IP ID */
246: 0, /* IP Frag */
247: 64, /* TTL */
248: IPPROTO_UDP, /* protocol */
249: 0, /* checksum */
250: src_ip, /* source IP */
251: dst_ip, /* destination IP */
252: NULL, /* payload */
253: 0, /* payload size */
254: l, /* libnet handle */
255: 0); /* libnet id */
256:
257: if (ptag == -1)
258: {
259: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
260: exit(EXIT_FAILURE);
261: }
262:
263:
264: eth_dst = libnet_hex_aton(eth_dst, &c);
265: ptag = libnet_autobuild_ethernet(
266: eth_dst, /* ethernet destination */
267: ETHERTYPE_IP, /* protocol type */
268: l); /* libnet handle */
269:
270: free(eth_dst);
271: if (ptag == -1)
272: {
273: fprintf(stderr, "Can't build ethernet header: %s\n",
274: libnet_geterror(l));
275: goto bad;
276: }
277:
278:
279: /*
280: * write to the wire
281: */
282: c = libnet_write(l);
283: if (c == -1)
284: {
285: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
286: goto bad;
287: }
288: else
289: {
290: fprintf(stderr, "Wrote %d byte Sebek packet; check the wire.\n", c);
291: }
292: libnet_destroy(l);
293: return (EXIT_SUCCESS);
294: bad:
295: libnet_destroy(l);
296: return (EXIT_FAILURE);
297:
298: return 0;
299: }
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