githubmirror/libnet

src/libnet_advanced.c
180 строк5 KB
Valery Ivanov
tests: fetch header/packet without advanced mode
02 май 2023, 10:14
02 май 2023, 10:14b19e727
/*
 *  $Id: libnet_advanced.c,v 1.8 2004/11/09 07:05:07 mike Exp $
 *
 *  libnet
 *  libnet_advanced.c - Advanced routines
 *
 *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
 *  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.
 *
 */

#include "common.h"

int
libnet_adv_cull_packet(libnet_t *l, uint8_t **packet, uint32_t *packet_s)
{
    *packet = NULL;
    *packet_s = 0;

#ifdef LIBNET_ENABLE_TESTS
    /*
     *  Allow to fetch the packet without advanced mode. Useful for unit tests.
     */
#else
    if (l->injection_type != LIBNET_LINK_ADV)
    {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                "%s(): advanced link mode not enabled", __func__);
        return (-1);
    }
#endif

    /* checksums will be written in */
    return (libnet_pblock_coalesce(l, packet, packet_s));
}

int
libnet_adv_cull_header(libnet_t *l, libnet_ptag_t ptag, uint8_t **header,
        uint32_t *header_s)
{
    libnet_pblock_t *p;

    *header = NULL;
    *header_s = 0;

#ifdef LIBNET_ENABLE_TESTS
    /*
     *  Allow to fetch the packet's header without advanced mode. Useful for unit tests.
     */
#else
    if (l->injection_type != LIBNET_LINK_ADV)
    {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                "%s(): advanced link mode not enabled", __func__);
        return (-1);
    }
#endif

    p = libnet_pblock_find(l, ptag);
    if (p == NULL)
    {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
            "%s(): ptag not found, you sure it exists?", __func__);
        return (-1);
    }
    *header   = p->buf;
    *header_s = p->b_len;

    return (1);
}

int
libnet_adv_write_link(libnet_t *l, const uint8_t *packet, uint32_t packet_s)
{
    ssize_t c;

    if (l->injection_type != LIBNET_LINK_ADV)
    {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                "%s(): advanced link mode not enabled", __func__);
        return (-1);
    }
    c = libnet_write_link(l, packet, packet_s);

    /* do statistics */
    if (c == (ssize_t)packet_s)
    {
        l->stats.packets_sent++;
        l->stats.bytes_written += c;
    }
    else
    {
        l->stats.packet_errors++;
        /*
         *  XXX - we probably should have a way to retrieve the number of
         *  bytes actually written (since we might have written something).
         */
        if (c > 0)
        {
            l->stats.bytes_written += c;
        }
    }
    return (c);
}

int
libnet_adv_write_raw_ipv4(libnet_t *l, const uint8_t *packet, uint32_t packet_s)
{
    ssize_t c;

    if (l->injection_type != LIBNET_RAW4_ADV)
    {
        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
                "%s(): advanced raw4 mode not enabled", __func__);
        return (-1);
    }
    c = libnet_write_raw_ipv4(l, packet, packet_s);

    /* do statistics */
    if (c == (ssize_t)packet_s)
    {
        l->stats.packets_sent++;
        l->stats.bytes_written += c;
    }
    else
    {
        l->stats.packet_errors++;
        /*
         *  XXX - we probably should have a way to retrieve the number of
         *  bytes actually written (since we might have written something).
         */
        if (c > 0)
        {
            l->stats.bytes_written += c;
        }
    }
    return (c);
}

void
libnet_adv_free_packet(libnet_t *l, uint8_t *packet)
{
    /*
     *  Restore original pointer address so free won't complain about a
     *  modified chunk pointer.
     */
    if (l->aligner > 0)
    {
        packet = packet - l->aligner;
    }
    free(packet);
}

/**
 * Local Variables:
 *  indent-tabs-mode: nil
 *  c-file-style: "stroustrup"
 * End:
 */