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/*
* Copyright (c) 2017-2024 OARC, Inc.
* Copyright (c) 2011-2017, IIS - The Internet Foundation in Sweden
* All rights reserved.
*
* This file is part of PacketQ.
*
* PacketQ 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.
*
* PacketQ 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 PacketQ. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pcap.h"
#include <stdio.h>
#include <stdlib.h>
namespace packetq {
bool Pcap_file::get_header()
{
// establish: byte order and file format
int res = get_int32();
if (res != 0xa1b2c3d4) {
res = flip32(res);
if (res != 0xa1b2c3d4) {
if (!m_gzipped) {
set_gzipped();
return get_header();
}
return false;
}
m_reverse_order = true;
}
// establish version
int major_version = get_int16();
int minor_version = get_int16();
if (major_version != 2 || minor_version != 4) {
printf("maj:%d min:%d\n", major_version, minor_version);
return false;
}
// check for 0 timezone offset and accuracy
if (!(get_int32() == 0)) {
printf("timezone offset != 0");
return false;
}
if (!(get_int32() == 0)) {
printf("timezone offset != 0");
return false;
}
m_snapshot_length = get_int32();
// check for ethernet packets
m_link_layer_type = get_int32();
if (m_link_layer_type != 1 && m_link_layer_type != 101 && m_link_layer_type != 113) {
fprintf(stderr, "PCAP file unsupported linklayer (%d)\n", m_link_layer_type);
return false;
}
return true;
}
unsigned char* Pcap_file::get_packet(int& len, int& s, int& us)
{
s = 0;
us = 0;
len = 0;
s = get_int32();
us = get_int32();
len = get_int32();
// skip past reallen
get_int32();
if (get_eof() || len < 0)
return 0;
unsigned char* buf = get_bytes(len);
return buf;
}
} // namespace packetq
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