Return to libnet_build_vrrp.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / src

Annotation of embedaddon/libnet/src/libnet_build_vrrp.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.2   misho       2:  *  $Id: libnet_build_vrrp.c,v 1.10 2004/04/13 17:32:28 mike Exp $
1.1       misho       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: 
1.1.1.3 ! misho      33: #include "common.h"
1.1       misho      34: 
                     35: libnet_ptag_t
1.1.1.2   misho      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,
1.1       misho      39: libnet_ptag_t ptag)
                     40: {
1.1.1.2   misho      41:     uint32_t n, h;
1.1       misho      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: 
1.1.1.2   misho      73:     n = libnet_pblock_append(l, p, (uint8_t *)&vrrp_hdr, LIBNET_VRRP_H);
1.1       misho      74:     if (n == -1)
                     75:     {
                     76:         goto bad;
                     77:     }
                     78: 
1.1.1.2   misho      79:     /* boilerplate payload sanity check / append macro */
                     80:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      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: 
1.1.1.3 ! misho      97: /**
        !            98:  * Local Variables:
        !            99:  *  indent-tabs-mode: nil
        !           100:  *  c-file-style: "stroustrup"
        !           101:  * End:
        !           102:  */