text: /*
   *  $Id: libnet_build_802.3.c,v 1.10 2004/04/13 17:32:28 mike Exp $
   *
   *  libnet
   *  libnet_build_802_3.c - 802.3 packet assembler
   *
   *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@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.
   *
   */
  
  #include "common.h"
  
  libnet_ptag_t
  libnet_build_802_3(const uint8_t *dst, const uint8_t *src, uint16_t len, 
  const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
  {
      uint32_t n, h;
      libnet_pblock_t *p;
      struct libnet_802_3_hdr _802_3_hdr;
  
      if (l == NULL)
      { 
          return (-1);
      } 
  
      n = LIBNET_802_3_H + payload_s;
      h = 0;
   
      /*
       *  Find the existing protocol block if a ptag is specified, or create
       *  a new one.
       */
      p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_802_3_H);
      if (p == NULL)
      {
          return (-1);
      }
  
      memset(&_802_3_hdr, 0, sizeof(_802_3_hdr));
      memcpy(_802_3_hdr._802_3_dhost, dst, ETHER_ADDR_LEN);  /* dest address */
      memcpy(_802_3_hdr._802_3_shost, src, ETHER_ADDR_LEN);  /* src address */
      _802_3_hdr._802_3_len = htons(len);                   /* packet length */
  
      n = libnet_pblock_append(l, p, (uint8_t *)&_802_3_hdr, LIBNET_802_3_H);
      if (n == -1)
      {
          goto bad;
      }
  
      /* boilerplate payload sanity check / append macro */
      LIBNET_DO_PAYLOAD(l, p);
   
      return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_802_3_H));
  bad:
      libnet_pblock_delete(l, p);
      return (-1);
  }
  
  /* EOF */
  