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1.1 misho 1: /*
2: *
3: * libnet 1.1
4: * Build a IPv4 packet with what you want as payload
5: *
1.1.1.2 misho 6: * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org>
1.1 misho 7: * All rights reserved.
8: *
9: * Ex:
10: * - send an UDP packet from port 4369 to port 8738
11: * ./ip -s 1.1.1.1 -d 2.2.2.2
12: *
13: * - send a TCP SYN from port 4369 to port 8738
14: * ./ip -s 1.1.1.1 -d 2.2.2.2 -t -p `printf "\x04\x57\x08\xae\x01\x01\x01\x01\x02\x02\x02\x02\x50\x02\x7f\xff\xd5\x91\x41\x41"`
15: *
16: *
17: * Redistribution and use in source and binary forms, with or without
18: * modification, are permitted provided that the following conditions
19: * are met:
20: * 1. Redistributions of source code must retain the above copyright
21: * notice, this list of conditions and the following disclaimer.
22: * 2. Redistributions in binary form must reproduce the above copyright
23: * notice, this list of conditions and the following disclaimer in the
24: * documentation and/or other materials provided with the distribution.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: */
39: #if (HAVE_CONFIG_H)
40: #include "../include/config.h"
41: #endif
42: #include "./libnet_test.h"
43:
44: int
45: main(int argc, char *argv[])
46: {
47: int c;
48: libnet_t *l;
49: char *device = NULL;
50: char *dst = "2.2.2.2", *src = "1.1.1.1";
51: char *hwdst = "22:22:22:22:22:22", *hwsrc = "11:11:11:11:11:11";
52: u_long src_ip, dst_ip;
53: char errbuf[LIBNET_ERRBUF_SIZE];
54: libnet_ptag_t ip_ptag = 0;
55: libnet_ptag_t eth_ptag = 0;
56: u_short proto = IPPROTO_UDP;
57: u_char payload[255] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
58: u_long payload_s = 8;
59:
60: printf("libnet 1.1 packet shaping: IP + payload[link]\n");
61:
62: while ((c = getopt(argc, argv, "d:s:D:S:tp:i:h")) != EOF)
63: {
64: switch (c)
65: {
66: case 'D':
67: hwdst = optarg;
68: break;
69:
70: case 'S':
71: hwsrc = optarg;
72: break;
73:
74: case 'd':
75: dst = optarg;
76: break;
77:
78: case 's':
79: src = optarg;
80: break;
81:
82: case 'i':
83: device = optarg;
84: break;
85:
86: case 't':
87: proto = IPPROTO_TCP;
88: break;
89:
90: case 'p':
1.1.1.3 ! misho 91: strncpy((char *)payload, optarg, sizeof(payload)-1);
! 92: payload_s = strlen((char *)payload);
1.1 misho 93: break;
94:
95: case 'h':
96: usage(argv[0]);
97: exit(EXIT_SUCCESS);
98:
99: default:
100: exit(EXIT_FAILURE);
101: }
102: }
103:
104:
105: /*
106: * Initialize the library. Root priviledges are required.
107: */
108: l = libnet_init(
109: LIBNET_LINK, /* injection type */
110: device, /* network interface */
111: errbuf); /* error buffer */
112:
113: printf("Using device %s\n", l->device);
114:
115: if (l == NULL)
116: {
117: fprintf(stderr, "libnet_init() failed: %s", errbuf);
118: exit(EXIT_FAILURE);
119: }
120:
121: if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == -1)
122: {
123: fprintf(stderr, "Bad destination IP address: %s\n", dst);
124: exit(EXIT_FAILURE);
125: }
126:
127: if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == -1)
128: {
129: fprintf(stderr, "Bad source IP address: %s\n", src);
130: exit(EXIT_FAILURE);
131: }
132:
133: /*
134: * Build the packet
135: */
136: ip_ptag = libnet_build_ipv4(
137: LIBNET_IPV4_H + payload_s, /* length */
138: 0, /* TOS */
139: 242, /* IP ID */
140: 0, /* IP Frag */
141: 64, /* TTL */
142: proto, /* protocol */
143: 0, /* checksum */
144: src_ip, /* source IP */
145: dst_ip, /* destination IP */
146: payload, /* payload */
147: payload_s, /* payload size */
148: l, /* libnet handle */
149: ip_ptag); /* libnet id */
150: if (ip_ptag == -1)
151: {
152: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
153: goto bad;
154: }
155:
156: eth_ptag = libnet_build_ethernet(
1.1.1.3 ! misho 157: (uint8_t *)hwdst, /* ethernet destination */
! 158: (uint8_t *)hwsrc, /* ethernet source */
1.1 misho 159: ETHERTYPE_IP, /* protocol type */
160: NULL, /* payload */
161: 0, /* payload size */
162: l, /* libnet handle */
163: 0); /* libnet id */
164: if (eth_ptag == -1)
165: {
166: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
167: goto bad;
168: }
169:
170: /*
171: * Write it to the wire.
172: */
173: c = libnet_write(l);
174: if (c == -1)
175: {
176: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
177: goto bad;
178: }
179: else
180: {
181: fprintf(stderr, "Wrote %d byte IP packet; check the wire.\n", c);
182: }
183:
184: libnet_destroy(l);
185: return (EXIT_SUCCESS);
186: bad:
187: libnet_destroy(l);
188: return (EXIT_FAILURE);
189: }
190:
191: void
192: usage(char *name)
193: {
194: fprintf(stderr,
195: "usage: %s [-s source_ip] [-d destination_ip]"
196: " [-S HW src] [-D HW dst]"
197: " [-i iface] [-p payload] [-t]\n",
198: name);
199: }
200: