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libnet

    1: /*
    2:  *  $Id: libnet_build_vrrp.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_vrrp.c - VRRP packet assembler
    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: #if (!(_WIN32) || (__CYGWIN__)) 
   37: #include "../include/libnet.h"
   38: #else
   39: #include "../include/win32/libnet.h"
   40: #endif
   41: 
   42: libnet_ptag_t
   43: libnet_build_vrrp(u_int8_t version, u_int8_t type, u_int8_t vrouter_id, 
   44: u_int8_t priority, u_int8_t ip_count, u_int8_t auth_type, u_int8_t advert_int,
   45: u_int16_t sum, u_int8_t *payload, u_int32_t payload_s, libnet_t *l,
   46: libnet_ptag_t ptag)
   47: {
   48:     u_int32_t n, h;
   49:     libnet_pblock_t *p;
   50:     struct libnet_vrrp_hdr vrrp_hdr;
   51: 
   52:     if (l == NULL)
   53:     { 
   54:         return (-1);
   55:     } 
   56: 
   57:     n = LIBNET_VRRP_H + payload_s;
   58:     h = LIBNET_VRRP_H + payload_s;
   59: 
   60:     /*
   61:      *  Find the existing protocol block if a ptag is specified, or create
   62:      *  a new one.
   63:      */
   64:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_VRRP_H);
   65:     if (p == NULL)
   66:     {
   67:         return (-1);
   68:     }
   69: 
   70:     memset(&vrrp_hdr, 0, sizeof(vrrp_hdr));
   71:     vrrp_hdr.vrrp_v          = version;
   72:     vrrp_hdr.vrrp_t          = type;
   73:     vrrp_hdr.vrrp_vrouter_id = vrouter_id;
   74:     vrrp_hdr.vrrp_priority   = priority;
   75:     vrrp_hdr.vrrp_ip_count   = ip_count;
   76:     vrrp_hdr.vrrp_auth_type  = auth_type;
   77:     vrrp_hdr.vrrp_advert_int = advert_int;
   78:     vrrp_hdr.vrrp_sum        = (sum ? htons(sum) : 0);
   79: 
   80:     n = libnet_pblock_append(l, p, (u_int8_t *)&vrrp_hdr, LIBNET_VRRP_H);
   81:     if (n == -1)
   82:     {
   83:         goto bad;
   84:     }
   85: 
   86:     if ((payload && !payload_s) || (!payload && payload_s))
   87:     {
   88:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   89: 			    "%s(): payload inconsistency\n", __func__);
   90:         goto bad;
   91:     }
   92: 
   93:     if (payload && payload_s)
   94:     {
   95:         n = libnet_pblock_append(l, p, payload, payload_s);
   96:         if (n == -1)
   97:         {
   98:             goto bad;
   99:         }
  100:     }
  101: 
  102:     if (sum == 0)
  103:     {
  104:         /*
  105:          *  If checksum is zero, by default libnet will compute a checksum
  106:          *  for the user.  The programmer can override this by calling
  107:          *  libnet_toggle_checksum(l, ptag, 1);
  108:          */
  109:         libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
  110:     }
  111:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_VRRP_H));
  112: bad:
  113:     libnet_pblock_delete(l, p);
  114:     return (-1);
  115: }
  116: 
  117: /* EOF */