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Annotation of embedaddon/libnet/src/libnet_build_igmp.c, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  *  $Id: libnet_build_igmp.c,v 1.12 2004/04/13 17:32:28 mike Exp $
1.1       misho       3:  *
                      4:  *  libnet
                      5:  *  libnet_build_igmp.c - IGMP 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
1.1.1.2 ! misho      43: libnet_build_igmp(uint8_t type, uint8_t reserved, uint16_t sum, uint32_t ip,
        !            44: const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
1.1       misho      45: {
1.1.1.2 ! misho      46:     uint32_t n, h;
1.1       misho      47:     libnet_pblock_t *p;
                     48:     struct libnet_igmp_hdr igmp_hdr;
                     49: 
                     50:     if (l == NULL)
                     51:     { 
                     52:         return (-1);
                     53:     } 
                     54: 
                     55:     n = LIBNET_IGMP_H + payload_s;
                     56:     h = LIBNET_IGMP_H;
                     57: 
                     58:     /*
                     59:      *  Find the existing protocol block if a ptag is specified, or create
                     60:      *  a new one.
                     61:      */
                     62:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IGMP_H);
                     63:     if (p == NULL)
                     64:     {
                     65:         return (-1);
                     66:     }
                     67: 
                     68:     memset(&igmp_hdr, 0, sizeof(igmp_hdr));
1.1.1.2 ! misho      69:     igmp_hdr.igmp_type         = type;
        !            70:     igmp_hdr.igmp_code         = reserved;
        !            71:     igmp_hdr.igmp_sum          = (sum ? htons(sum) : 0);
        !            72:     igmp_hdr.igmp_group.s_addr = ip;
1.1       misho      73: 
1.1.1.2 ! misho      74:     n = libnet_pblock_append(l, p, (uint8_t *)&igmp_hdr, LIBNET_IGMP_H);
1.1       misho      75:     if (n == -1)
                     76:     {
                     77:         goto bad;
                     78:     }
                     79: 
1.1.1.2 ! misho      80:     /* boilerplate payload sanity check / append macro */
        !            81:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      82: 
                     83:     if (sum == 0)
                     84:     {
                     85:         /*
                     86:          *  If checksum is zero, by default libnet will compute a checksum
                     87:          *  for the user.  The programmer can override this by calling
                     88:          *  libnet_toggle_checksum(l, ptag, 1);
                     89:          */
                     90:         libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
                     91:     }
                     92: 
                     93:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_IGMP_H));
                     94: bad:
                     95:     libnet_pblock_delete(l, p);
                     96:     return (-1);
                     97: }
                     98: 
                     99: /* EOF */