Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / env / common / vera / niu_ippktgen / C / libnet / src / libnet_build_dhcp.c

/*
*  $Id: libnet_build_dhcp.c,v 1.20 2005/11/29 22:19:59 carlosc Exp $
*
*  libnet
*  libnet_build_dhcp.c - DHCP/BOOTP 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.
*
*/

#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#if (!(_WIN32) || (__CYGWIN__)) 
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endif

libnet_ptag_t
libnet_build_dhcpv4(u_int8_t opcode, u_int8_t htype, u_int8_t hlen, 
u_int8_t hopcount, u_int32_t xid, u_int16_t secs, u_int16_t flags,
u_int32_t cip, u_int32_t yip, u_int32_t sip, u_int32_t gip, u_int8_t *chaddr,
u_int8_t *sname, u_int8_t *file, u_int8_t *payload, u_int32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
   u_int32_t n, h;
   libnet_pblock_t *p; 
   struct libnet_dhcpv4_hdr dhcp_hdr;

   if (l == NULL)
   { 
       return (-1);
   } 

   n = LIBNET_DHCPV4_H + payload_s;
   h = 0;          /* no checksum */

   /*
    *  Find the existing protocol block if a ptag is specified, or create
    *  a new one.
    */
   p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DHCPV4_H);
   if (p == NULL)
   {
       return (-1);
   }

   memset(&dhcp_hdr, 0, sizeof(dhcp_hdr));
   dhcp_hdr.dhcp_opcode    = opcode;
   dhcp_hdr.dhcp_htype     = htype;
   dhcp_hdr.dhcp_hlen      = hlen;
   dhcp_hdr.dhcp_hopcount  = hopcount;
   dhcp_hdr.dhcp_xid       = htonl(xid);
   dhcp_hdr.dhcp_secs      = htons(secs);
   dhcp_hdr.dhcp_flags     = htons(flags);
   dhcp_hdr.dhcp_cip       = htonl(cip);
   dhcp_hdr.dhcp_yip       = htonl(yip);
   dhcp_hdr.dhcp_sip       = htonl(sip);
   dhcp_hdr.dhcp_gip       = htonl(gip);

   if (chaddr)
   { 
       memcpy(dhcp_hdr.dhcp_chaddr, chaddr, sizeof (dhcp_hdr.dhcp_chaddr));
       dhcp_hdr.dhcp_chaddr[sizeof(dhcp_hdr.dhcp_chaddr) - 1] = 0;
   }
   else
   {
       memset(dhcp_hdr.dhcp_chaddr, 0, sizeof (dhcp_hdr.dhcp_chaddr));
   }

   if (sname)
   { 
       memcpy(dhcp_hdr.dhcp_sname, sname, sizeof (dhcp_hdr.dhcp_sname));
       dhcp_hdr.dhcp_sname[sizeof(dhcp_hdr.dhcp_sname) - 1] = 0;
   }
   else
   {
       memset(dhcp_hdr.dhcp_sname, 0, sizeof (dhcp_hdr.dhcp_sname));
   }

   if (file)
   {
       memcpy(dhcp_hdr.dhcp_file, file, sizeof (dhcp_hdr.dhcp_file));
       dhcp_hdr.dhcp_file[sizeof(dhcp_hdr.dhcp_file) - 1] = 0;
   }
   else
   {
       memset(dhcp_hdr.dhcp_file, 0, sizeof(dhcp_hdr.dhcp_file));
   }
   dhcp_hdr.dhcp_magic = htonl(DHCP_MAGIC);    /* should this be tunable? */

   n = libnet_pblock_append(l, p, (u_int8_t *)&dhcp_hdr, LIBNET_DHCPV4_H);
   if (n == -1)
   {
       goto bad;
   }

   if ((payload && !payload_s) || (!payload && payload_s))
   {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                "%s(): payload inconsistency\n", __func__);
       goto bad;
   }

   if (payload && payload_s)
   {
       n = libnet_pblock_append(l, p, payload, payload_s);
       if (n == -1)
       {
           goto bad;
       }
   }

   return (ptag ? ptag : libnet_pblock_update(l, p, h, 
           LIBNET_PBLOCK_DHCPV4_H));
bad:
   libnet_pblock_delete(l, p);
   return (-1);
}

libnet_ptag_t
libnet_build_bootpv4(u_int8_t opcode, u_int8_t htype, u_int8_t hlen,
u_int8_t hopcount, u_int32_t xid, u_int16_t secs, u_int16_t flags,
u_int32_t cip, u_int32_t yip, u_int32_t sip, u_int32_t gip, u_int8_t *chaddr,
u_int8_t *sname, u_int8_t *file, u_int8_t *payload, u_int32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
   return (libnet_build_dhcpv4(opcode, htype, hlen, hopcount, xid, secs,
       flags, cip, yip, sip, gip, chaddr, sname, file, payload, payload_s, 
       l, ptag));
}

/* EOF */