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Version 1.2p1

    1: /*
    2:  *  $Id: libnet_build_vrrp.c,v 1.1.1.3 2023/09/27 11:11:38 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: #include "common.h"
   34: 
   35: libnet_ptag_t
   36: libnet_build_vrrp(uint8_t version, uint8_t type, uint8_t vrouter_id, 
   37: uint8_t priority, uint8_t ip_count, uint8_t auth_type, uint8_t advert_int,
   38: uint16_t sum, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
   39: libnet_ptag_t ptag)
   40: {
   41:     uint32_t n, h;
   42:     libnet_pblock_t *p;
   43:     struct libnet_vrrp_hdr vrrp_hdr;
   44: 
   45:     if (l == NULL)
   46:     { 
   47:         return (-1);
   48:     } 
   49: 
   50:     n = LIBNET_VRRP_H + payload_s;
   51:     h = LIBNET_VRRP_H + payload_s;
   52: 
   53:     /*
   54:      *  Find the existing protocol block if a ptag is specified, or create
   55:      *  a new one.
   56:      */
   57:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_VRRP_H);
   58:     if (p == NULL)
   59:     {
   60:         return (-1);
   61:     }
   62: 
   63:     memset(&vrrp_hdr, 0, sizeof(vrrp_hdr));
   64:     vrrp_hdr.vrrp_v          = version;
   65:     vrrp_hdr.vrrp_t          = type;
   66:     vrrp_hdr.vrrp_vrouter_id = vrouter_id;
   67:     vrrp_hdr.vrrp_priority   = priority;
   68:     vrrp_hdr.vrrp_ip_count   = ip_count;
   69:     vrrp_hdr.vrrp_auth_type  = auth_type;
   70:     vrrp_hdr.vrrp_advert_int = advert_int;
   71:     vrrp_hdr.vrrp_sum        = (sum ? htons(sum) : 0);
   72: 
   73:     n = libnet_pblock_append(l, p, (uint8_t *)&vrrp_hdr, LIBNET_VRRP_H);
   74:     if (n == -1)
   75:     {
   76:         goto bad;
   77:     }
   78: 
   79:     /* boilerplate payload sanity check / append macro */
   80:     LIBNET_DO_PAYLOAD(l, p);
   81: 
   82:     if (sum == 0)
   83:     {
   84:         /*
   85:          *  If checksum is zero, by default libnet will compute a checksum
   86:          *  for the user.  The programmer can override this by calling
   87:          *  libnet_toggle_checksum(l, ptag, 1);
   88:          */
   89:         libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
   90:     }
   91:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_VRRP_H));
   92: bad:
   93:     libnet_pblock_delete(l, p);
   94:     return (-1);
   95: }
   96: 
   97: /**
   98:  * Local Variables:
   99:  *  indent-tabs-mode: nil
  100:  *  c-file-style: "stroustrup"
  101:  * End:
  102:  */