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- /*
- * $Id: build_arp.c,v 1.1.1.1 1999/05/18 15:33:42 dugsong Exp $
- *
- * libnet
- * build_arp.c - ARP packet assembler
- *
- * Copyright (c) 1998, 1999 Mike D. Schiffman <mike@infonexus.com>
- * route|daemon9 <route@infonexus.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- */
-
- #if (HAVE_CONFIG_H)
- #include "../include/config.h"
- #endif
- #include "../include/libnet.h"
-
- void
- build_arp(u_short hrd, u_short pro, u_char hln, u_char pln, u_short op,
- u_char *sha, u_char *spa, u_char *tha, u_char *tpa,
- const u_char *payload, int payload_s, u_char *buf)
- {
- struct libnet_arp_hdr arp_hdr;
-
- assert(buf);
-
- arp_hdr.ar_hrd = htons(hrd); /* hardware address type */
- arp_hdr.ar_pro = htons(pro); /* protocol address type */
- arp_hdr.ar_hln = hln; /* hardware address length */
- arp_hdr.ar_pln = pln; /* protocol address length */
- arp_hdr.ar_op = htons(op); /* opcode command */
- memcpy(arp_hdr.ar_sha, sha, hln); /* sender hardware address */
- memcpy(arp_hdr.ar_spa, spa, pln); /* sender protocol (IP) address */
- memcpy(arp_hdr.ar_tha, tha, hln); /* target hardware address */
- memcpy(arp_hdr.ar_tpa, tpa, pln); /* target protocol (IP) address */
-
- if (payload && payload_s)
- {
- /*
- * Unchecked runtime error for buf + ARP_H payload to be greater than
- * the allocated heap memory.
- */
- memcpy(buf + ARP_H, payload, payload_s);
- }
- memcpy(buf, &arp_hdr, sizeof(arp_hdr));
- }
-
-
- /* EOF */
-