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

1.1       misho       1: /*
1.1.1.2 ! misho       2:  *  $Id: libnet_build_isl.c,v 1.10 2004/04/13 17:32:28 mike Exp $
1.1       misho       3:  *
                      4:  *  libnet
                      5:  *  libnet_build_isl.c - cisco's inter-switch link 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_isl(uint8_t *dhost, uint8_t type, uint8_t user,
        !            44: uint8_t *shost, uint16_t len, const uint8_t *snap, uint16_t vid,
        !            45: uint16_t portindex, uint16_t reserved, const uint8_t *payload,
        !            46: uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
1.1       misho      47: {
1.1.1.2 ! misho      48:     uint32_t n;
1.1       misho      49:     libnet_pblock_t *p;
                     50:     struct libnet_isl_hdr isl_hdr;
                     51: 
                     52:     if (l == NULL)
                     53:     {
                     54:         return (-1);
                     55:     }
                     56: 
                     57:     n = LIBNET_ISL_H + payload_s;           /* size of memory block */
                     58: 
                     59:     /*
                     60:      *  Find the existing protocol block if a ptag is specified, or create
                     61:      *  a new one.
                     62:      */
                     63:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ISL_H);
                     64:     if (p == NULL)
                     65:     {
                     66:         return (-1);
                     67:     }
                     68: 
1.1.1.2 ! misho      69:     memset(&isl_hdr, 0, sizeof (isl_hdr));
        !            70:     memcpy(&isl_hdr.isl_dhost, dhost, sizeof(isl_hdr.isl_dhost));
1.1       misho      71:     isl_hdr.isl_type    = type;
                     72:     isl_hdr.isl_user    = user;
1.1.1.2 ! misho      73:     memcpy(&isl_hdr.isl_shost, shost, sizeof(isl_hdr.isl_shost));
1.1       misho      74:     isl_hdr.isl_len     = htons(len);
1.1.1.2 ! misho      75:     memcpy(&isl_hdr.isl_snap, snap, sizeof(isl_hdr.isl_snap));
1.1       misho      76:     isl_hdr.isl_vid     = htons(vid);
1.1.1.2 ! misho      77:     isl_hdr.isl_index   = htons(portindex);
1.1       misho      78:     isl_hdr.isl_reserved= htons(reserved);
                     79: 
1.1.1.2 ! misho      80:     n = libnet_pblock_append(l, p, (uint8_t *)&isl_hdr, LIBNET_ISL_H);
1.1       misho      81:     if (n == -1)
                     82:     {
                     83:         goto bad;
                     84:     }
                     85: 
1.1.1.2 ! misho      86:     /* boilerplate payload sanity check / append macro */
        !            87:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      88: 
                     89:     /* we need to compute the CRC for the ethernet frame and the ISL frame */
                     90:     libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
                     91:     return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
                     92:             LIBNET_PBLOCK_ISL_H));
                     93: bad:
                     94:     libnet_pblock_delete(l, p);
                     95:     return (-1);
                     96: }
                     97: 
                     98: /* EOF */