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

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: 
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_igmp(uint8_t type, uint8_t reserved, uint16_t sum, uint32_t ip,
                     37: const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
1.1       misho      38: {
1.1.1.2   misho      39:     uint32_t n, h;
1.1       misho      40:     libnet_pblock_t *p;
                     41:     struct libnet_igmp_hdr igmp_hdr;
                     42: 
                     43:     if (l == NULL)
                     44:     { 
                     45:         return (-1);
                     46:     } 
                     47: 
                     48:     n = LIBNET_IGMP_H + payload_s;
                     49:     h = LIBNET_IGMP_H;
                     50: 
                     51:     /*
                     52:      *  Find the existing protocol block if a ptag is specified, or create
                     53:      *  a new one.
                     54:      */
                     55:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IGMP_H);
                     56:     if (p == NULL)
                     57:     {
                     58:         return (-1);
                     59:     }
                     60: 
                     61:     memset(&igmp_hdr, 0, sizeof(igmp_hdr));
1.1.1.2   misho      62:     igmp_hdr.igmp_type         = type;
                     63:     igmp_hdr.igmp_code         = reserved;
                     64:     igmp_hdr.igmp_sum          = (sum ? htons(sum) : 0);
                     65:     igmp_hdr.igmp_group.s_addr = ip;
1.1       misho      66: 
1.1.1.2   misho      67:     n = libnet_pblock_append(l, p, (uint8_t *)&igmp_hdr, LIBNET_IGMP_H);
1.1       misho      68:     if (n == -1)
                     69:     {
                     70:         goto bad;
                     71:     }
                     72: 
1.1.1.2   misho      73:     /* boilerplate payload sanity check / append macro */
                     74:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      75: 
                     76:     if (sum == 0)
                     77:     {
                     78:         /*
                     79:          *  If checksum is zero, by default libnet will compute a checksum
                     80:          *  for the user.  The programmer can override this by calling
                     81:          *  libnet_toggle_checksum(l, ptag, 1);
                     82:          */
                     83:         libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
                     84:     }
                     85: 
                     86:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_IGMP_H));
                     87: bad:
                     88:     libnet_pblock_delete(l, p);
                     89:     return (-1);
                     90: }
                     91: 
1.1.1.3 ! misho      92: /**
        !            93:  * Local Variables:
        !            94:  *  indent-tabs-mode: nil
        !            95:  *  c-file-style: "stroustrup"
        !            96:  * End:
        !            97:  */