Annotation of embedaddon/libnet/sample/arp.c, revision 1.1.1.3
1.1 misho 1: /*
1.1.1.2 misho 2: * $Id: arp.c,v 1.7 2004/11/09 07:05:07 mike Exp $
1.1 misho 3: *
4: * libnet 1.1
5: * Build an ARP packet
6: *
7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
8: * All rights reserved.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
31: */
32:
33: #if (HAVE_CONFIG_H)
34: #include "../include/config.h"
35: #endif
36: #include "./libnet_test.h"
37:
38: int
39: main(int argc, char *argv[])
40: {
41: int c;
1.1.1.2 misho 42: uint32_t i;
1.1 misho 43: libnet_t *l;
44: libnet_ptag_t t;
45: char *device = NULL;
1.1.1.2 misho 46: uint8_t *packet;
47: uint32_t packet_s;
1.1 misho 48: char errbuf[LIBNET_ERRBUF_SIZE];
49:
50: printf("libnet 1.1 packet shaping: ARP[link -- autobuilding ethernet]\n");
51:
52: if (argc > 1)
53: {
54: device = argv[1];
55: }
56:
57: l = libnet_init(
58: LIBNET_LINK_ADV, /* injection type */
59: device, /* network interface */
60: errbuf); /* errbuf */
61:
62: if (l == NULL)
63: {
64: fprintf(stderr, "%s", errbuf);
65: exit(EXIT_FAILURE);
66: }
67: else
68:
69: i = libnet_get_ipaddr4(l);
70:
71: t = libnet_build_arp(
72: ARPHRD_ETHER, /* hardware addr */
73: ETHERTYPE_IP, /* protocol addr */
74: 6, /* hardware addr size */
75: 4, /* protocol addr size */
76: ARPOP_REPLY, /* operation type */
77: enet_src, /* sender hardware addr */
1.1.1.2 misho 78: (uint8_t *)&i, /* sender protocol addr */
1.1 misho 79: enet_dst, /* target hardware addr */
1.1.1.2 misho 80: (uint8_t *)&i, /* target protocol addr */
1.1 misho 81: NULL, /* payload */
82: 0, /* payload size */
83: l, /* libnet context */
84: 0); /* libnet id */
85: if (t == -1)
86: {
87: fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
88: goto bad;
89: }
90:
91: t = libnet_autobuild_ethernet(
92: enet_dst, /* ethernet destination */
93: ETHERTYPE_ARP, /* protocol type */
94: l); /* libnet handle */
95: if (t == -1)
96: {
97: fprintf(stderr, "Can't build ethernet header: %s\n",
98: libnet_geterror(l));
99: goto bad;
100: }
101:
102:
103: if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
104: {
105: fprintf(stderr, "%s", libnet_geterror(l));
106: }
107: else
108: {
109: fprintf(stderr, "packet size: %d\n", packet_s);
110: libnet_adv_free_packet(l, packet);
111: }
112:
113: c = libnet_write(l);
114:
115: if (c == -1)
116: {
117: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
118: goto bad;
119: }
120: else
121: {
122: fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
123: "check the wire.\n", c, libnet_cq_getlabel(l));
124: }
125: libnet_destroy(l);
126: return (EXIT_SUCCESS);
127: bad:
128: libnet_destroy(l);
129: return (EXIT_FAILURE);
130: }
131:
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