* $Id: libnet_build_igmp.c,v 1.21 2005/11/29 21:55:13 carlosc Exp $
* libnet_build_igmp.c - IGMP packet assembler
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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
#include "../include/config.h"
#if (!(_WIN32) || (__CYGWIN__))
#include "../include/libnet.h"
#include "../include/win32/libnet.h"
libnet_build_igmp(u_int8_t type
, u_int8_t code
, u_int16_t sum
, u_int32_t ip
,
u_int8_t
*payload
, u_int32_t payload_s
, libnet_t
*l
, libnet_ptag_t ptag
)
struct libnet_igmp_hdr igmp_hdr
;
n
= LIBNET_IGMP_H
+ payload_s
;
* Find the existing protocol block if a ptag is specified, or create
p
= libnet_pblock_probe(l
, ptag
, n
, LIBNET_PBLOCK_IGMP_H
);
memset(&igmp_hdr
, 0, sizeof(igmp_hdr
));
igmp_hdr
.igmp_type
= type
; /* packet type */
igmp_hdr
.igmp_code
= code
; /* packet code */
igmp_hdr
.igmp_sum
= (sum
? htons(sum
) : 0); /* packet checksum */
igmp_hdr
.igmp_group
.s_addr
= htonl(ip
);
n
= libnet_pblock_append(l
, p
, (u_int8_t
*)&igmp_hdr
, LIBNET_IGMP_H
);
if ((payload
&& !payload_s
) || (!payload
&& payload_s
))
snprintf(l
->err_buf
, LIBNET_ERRBUF_SIZE
,
"%s(): payload inconsistency\n", __func__
);
if (payload
&& payload_s
)
n
= libnet_pblock_append(l
, p
, payload
, payload_s
);
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
libnet_pblock_setflags(p
, LIBNET_PBLOCK_DO_CHECKSUM
);
return (ptag
? ptag
: libnet_pblock_update(l
, p
, h
, LIBNET_PBLOCK_IGMP_H
));
libnet_pblock_delete(l
, p
);