1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*\
* pcap2nbench - Converts libpcap network traces to nbench input
* Copyright (C) 2004 Jim McDonough <jmcd@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Written by Anthony Liguori <aliguori@us.ibm.com>
\*/
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "ip.hpp"
ip::ip(const uint8_t *data, size_t length)
{
if (length < 20) {
std::cerr << "Invalid ip packet" << std::endl;
}
version = (data[0] >> 4) & 0x0F;
header_length = (data[0] & 0x0F) * 4;
dsfield = data[1];
memcpy(&total_length, data + 2, 2);
total_length = ntohs(total_length);
memcpy(&id, data + 4, 2);
id = ntohs(id);
flags = (data[6] >> 4) & 0x0F;
fragment_offset = ((data[6] & 0x0F) << 4) | data[7];
ttl = data[8];
protocol = data[9];
memcpy(&checksum, data + 10, 2);
checksum = ntohs(checksum);
memcpy(&source, data + 12, 4);
memcpy(&destination, data + 16, 4);
}
std::ostream &operator<<(std::ostream &lhs, const ip &rhs)
{
lhs << "Version: " << (uint32_t)rhs.version << std::endl
<< "Header length: " << (uint32_t)rhs.header_length << std::endl
<< "Differentiated Services Field: " << (uint32_t)rhs.dsfield << std::endl
<< "Total Length: " << (uint32_t)rhs.total_length << std::endl
<< "Identification: " << (uint32_t)rhs.id << std::endl
<< "Flags: " << (uint32_t)rhs.flags << std::endl
<< "Fragment offset: " << (uint32_t)rhs.fragment_offset << std::endl
<< "TTL: " << (uint32_t)rhs.ttl << std::endl
<< "Protocol: " << (uint32_t)rhs.protocol << std::endl
<< "Checksum: " << (uint32_t)rhs.checksum << std::endl
<< "Source: " << inet_ntoa(*((in_addr *)&rhs.source)) << std::endl
<< "Destination: " << inet_ntoa(*((in_addr *)&rhs.destination)) << std::endl;
return lhs;
}
|
