2 * $Id: libnet_build_arp.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
5 * libnet_build_arp.c - ARP packet assembler
7 * Copyright (c) 1998 - 2001 Mike D. Schiffman <mike@infonexus.com>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 #include "../include/config.h"
36 #include "../include/libnet.h"
39 libnet_build_arp(u_short hrd, u_short pro, u_char hln, u_char pln, u_short op,
40 u_char *sha, u_char *spa, u_char *tha, u_char *tpa,
41 const u_char *payload, int payload_s, u_char *buf)
43 struct libnet_arp_hdr arp_hdr;
50 arp_hdr.ar_hrd = htons(hrd); /* hardware address type */
51 arp_hdr.ar_pro = htons(pro); /* protocol address type */
52 arp_hdr.ar_hln = hln; /* hardware address length */
53 arp_hdr.ar_pln = pln; /* protocol address length */
54 arp_hdr.ar_op = htons(op); /* opcode command */
55 memcpy(arp_hdr.ar_sha, sha, hln); /* sender hardware address */
56 memcpy(arp_hdr.ar_spa, spa, pln); /* sender protocol (IP) address */
57 memcpy(arp_hdr.ar_tha, tha, hln); /* target hardware address */
58 memcpy(arp_hdr.ar_tpa, tpa, pln); /* target protocol (IP) address */
60 if (payload && payload_s)
63 * Unchecked runtime error for buf + LIBNET_ARP_H payload to be
64 * greater than the allocated heap memory.
66 memcpy(buf + LIBNET_ARP_H, payload, payload_s);
68 memcpy(buf, &arp_hdr, sizeof(arp_hdr));