libnet_build_link.c

tcp数据流重放工具

/*
 *  $Id: libnet_build_link.c,v 1.4 2003/09/23 22:36:55 mike Exp $
 *
 *  libnet
 *  libnet_build_link.c - link-layer packet assembler
 *
 *  Copyright (c) 2003 Roberto Larcher <[e-mail]>
 *  Copyright (c) 1998 - 2003 Mike D. Schiffman <[e-mail]>
 *  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 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
 * SUCH DAMAGE.
 *
 */

#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#if (!(_WIN32) || (__CYGWIN__))
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endif

libnet_ptag_t
libnet_autobuild_link(u_int8_t *dst, u_int16_t type, libnet_t *l)
{
    u_int8_t org_code[3] = {0x00, 0x00, 0x00};
    switch (l->link_type)
    {
       /* add FDDI */
        case DLT_EN10MB:
            return (libnet_autobuild_ethernet(dst, type, l));
        case DLT_IEEE802:
            return (libnet_autobuild_token_ring(
                   LIBNET_TOKEN_RING_FRAME,
                   LIBNET_TOKEN_RING_LLC_FRAME,
                   dst,
                   LIBNET_SAP_SNAP,
                   LIBNET_SAP_SNAP,
                   0x03,
                   org_code,
                   TOKEN_RING_TYPE_IP,
                   l));
        default:
            break;
    }
    snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
            "%s(): linktype %d not supported\n", __func__, l->link_type);
    return (-1);
}

libnet_ptag_t
libnet_build_link(u_int8_t *dst, u_int8_t *src, u_int16_t type, u_int8_t *payload,
            u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)

{
    u_int8_t org_code[3] = {0x00, 0x00, 0x00};
    switch (l->link_type)
    {
        /* add FDDI */
        case DLT_EN10MB:
            return (libnet_build_ethernet(dst,
                    src,
                    type,
                    payload,
                    payload_s,
                    l,
                    ptag));
        case DLT_IEEE802:
            return (libnet_build_token_ring(LIBNET_TOKEN_RING_FRAME,
                    LIBNET_TOKEN_RING_LLC_FRAME,
                    dst,
                    src,
                    LIBNET_SAP_SNAP,   /* DSAP -> SNAP encap */
                    LIBNET_SAP_SNAP,
                    0x03,
                    org_code,
                    type,
                    payload,
                    payload_s,
                    l,
                    ptag));
        default:
            break;
    }
    snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
            "%s(): linktype %d not supported\n", __func__, l->link_type);
    return (-1);
}

/* EOF */