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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: u_long src_ip, dst_ip;
52: char errbuf[LIBNET_ERRBUF_SIZE];
53: libnet_ptag_t ip_ptag = 0;
54: u_short proto = IPPROTO_UDP;
55: u_char payload[255] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
56: u_long payload_s = 8;
57:
58: printf("libnet 1.1 packet shaping: IP + payload[raw]\n");
59:
60: /*
61: * handle options
62: */
63: while ((c = getopt(argc, argv, "d:s:tp:i:h")) != EOF)
64: {
65: switch (c)
66: {
67: case 'd':
68: dst = optarg;
69: break;
70:
71: case 's':
72: src = optarg;
73: break;
74:
75: case 'i':
76: device = optarg;
77: break;
78:
79: case 't':
80: proto = IPPROTO_TCP;
81: break;
82:
83: case 'p':
1.1.1.3 ! misho 84: strncpy((char *)payload, optarg, sizeof(payload)-1);
! 85: payload_s = strlen((char *)payload);
1.1 misho 86: break;
87:
88: case 'h':
89: usage(argv[0]);
90: exit(EXIT_SUCCESS);
91:
92: default:
93: exit(EXIT_FAILURE);
94: }
95: }
96:
97:
98: /*
99: * Initialize the library. Root priviledges are required.
100: */
101: l = libnet_init(
102: LIBNET_RAW4, /* injection type */
103: device, /* network interface */
104: errbuf); /* error buffer */
105:
106: printf("Using device %s\n", l->device);
107:
108: if (l == NULL)
109: {
110: fprintf(stderr, "libnet_init() failed: %s", errbuf);
111: exit(EXIT_FAILURE);
112: }
113:
114: if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == -1)
115: {
116: fprintf(stderr, "Bad destination IP address: %s\n", dst);
117: exit(EXIT_FAILURE);
118: }
119:
120: if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == -1)
121: {
122: fprintf(stderr, "Bad source IP address: %s\n", src);
123: exit(EXIT_FAILURE);
124: }
125:
126:
127: /*
128: * Build the packet
129: */
130: ip_ptag = libnet_build_ipv4(
131: LIBNET_IPV4_H + payload_s, /* length */
132: 0, /* TOS */
133: 242, /* IP ID */
134: 0, /* IP Frag */
135: 64, /* TTL */
136: proto, /* protocol */
137: 0, /* checksum */
138: src_ip, /* source IP */
139: dst_ip, /* destination IP */
140: payload, /* payload */
141: payload_s, /* payload size */
142: l, /* libnet handle */
143: ip_ptag); /* libnet id */
144: if (ip_ptag == -1)
145: {
146: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
147: goto bad;
148: }
149:
150: /*
151: * Write it to the wire.
152: */
153: c = libnet_write(l);
154: if (c == -1)
155: {
156: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
157: goto bad;
158: }
159: else
160: {
161: fprintf(stderr, "Wrote %d byte IP packet; check the wire.\n", c);
162: }
163:
164: libnet_destroy(l);
165: return (EXIT_SUCCESS);
166: bad:
167: libnet_destroy(l);
168: return (EXIT_FAILURE);
169: }
170:
171: void
172: usage(char *name)
173: {
174: fprintf(stderr,
175: "usage: %s [-s source_ip] [-d destination_ip]"
176: " [-i iface] [-p payload] [-t]\n",
177: name);
178: }
179: