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/*
SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "Packet.h"
#include <arpa/inet.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <sys/types.h>
#include <pcap/pcap.h>
#include <pcap/sll.h>
uint32_t u8Tou32(uint8_t first, uint8_t second, uint8_t third, uint8_t fourth)
{
return uint32_t(first) << 24 | uint32_t(second) << 16 | uint32_t(third) << 8 | uint32_t(fourth);
}
Packet::Packet()
{
}
Packet::Packet(const TimeStamp::MicroSeconds &timeStamp, const uint8_t *data, uint32_t dataLength, uint32_t packetSize)
: m_timeStamp(timeStamp)
{
m_size = packetSize;
const sll_header *header = reinterpret_cast<const sll_header *>(data);
switch (ntohs(header->sll_protocol)) {
case ETHERTYPE_IP:
m_networkProtocol = NetworkProtocolType::IPv4;
if (sizeof(sll_header) <= dataLength) {
parseIPv4(data + sizeof(sll_header), dataLength - sizeof(sll_header));
}
break;
case ETHERTYPE_IPV6:
m_networkProtocol = NetworkProtocolType::IPv6;
if (sizeof(sll_header) <= dataLength) {
parseIPv6(data + sizeof(sll_header), dataLength - sizeof(sll_header));
}
break;
default:
m_networkProtocol = NetworkProtocolType::Unknown;
break;
}
}
Packet::~Packet()
{
}
unsigned int Packet::size() const
{
return m_size;
}
TimeStamp::MicroSeconds Packet::timeStamp() const
{
return m_timeStamp;
}
Packet::NetworkProtocolType Packet::networkProtocol() const
{
return m_networkProtocol;
}
Packet::TransportProtocolType Packet::transportProtocol() const
{
return m_transportProtocol;
}
Packet::Address Packet::sourceAddress() const
{
return m_sourceAddress;
}
Packet::Address Packet::destinationAddress() const
{
return m_destinationAddress;
}
void Packet::parseIPv4(const uint8_t *data, int32_t dataLength)
{
if (dataLength < int32_t(sizeof(ip))) {
return;
}
const ip *header = reinterpret_cast<const ip *>(data);
m_sourceAddress.address[3] = ntohl(header->ip_src.s_addr);
m_destinationAddress.address[3] = ntohl(header->ip_dst.s_addr);
parseTransport(header->ip_p, data + sizeof(ip), dataLength - sizeof(ip));
}
void Packet::parseIPv6(const uint8_t *data, int32_t dataLength)
{
if (dataLength < int32_t(sizeof(ip6_hdr))) {
return;
}
const ip6_hdr *header = reinterpret_cast<const ip6_hdr *>(data);
m_sourceAddress.address = {
u8Tou32(header->ip6_src.s6_addr[0], header->ip6_src.s6_addr[1], header->ip6_src.s6_addr[2], header->ip6_src.s6_addr[3]),
u8Tou32(header->ip6_src.s6_addr[4], header->ip6_src.s6_addr[5], header->ip6_src.s6_addr[6], header->ip6_src.s6_addr[7]),
u8Tou32(header->ip6_src.s6_addr[8], header->ip6_src.s6_addr[9], header->ip6_src.s6_addr[10], header->ip6_src.s6_addr[11]),
u8Tou32(header->ip6_src.s6_addr[12], header->ip6_src.s6_addr[13], header->ip6_src.s6_addr[14], header->ip6_src.s6_addr[15]),
};
m_destinationAddress.address = {
u8Tou32(header->ip6_dst.s6_addr[0], header->ip6_dst.s6_addr[1], header->ip6_dst.s6_addr[2], header->ip6_dst.s6_addr[3]),
u8Tou32(header->ip6_dst.s6_addr[4], header->ip6_dst.s6_addr[5], header->ip6_dst.s6_addr[6], header->ip6_dst.s6_addr[7]),
u8Tou32(header->ip6_dst.s6_addr[8], header->ip6_dst.s6_addr[9], header->ip6_dst.s6_addr[10], header->ip6_dst.s6_addr[11]),
u8Tou32(header->ip6_dst.s6_addr[12], header->ip6_dst.s6_addr[13], header->ip6_dst.s6_addr[14], header->ip6_dst.s6_addr[15]),
};
parseTransport(header->ip6_nxt, data + sizeof(ip6_hdr), dataLength - sizeof(ip6_hdr));
}
void Packet::parseTransport(uint8_t type, const uint8_t *data, int32_t dataLength)
{
switch (type) {
case IPPROTO_TCP: {
m_transportProtocol = TransportProtocolType::Tcp;
if (dataLength >= int32_t(sizeof(tcphdr))) {
const tcphdr *tcpHeader = reinterpret_cast<const tcphdr *>(data);
m_sourceAddress.port = ntohs(tcpHeader->th_sport);
m_destinationAddress.port = ntohs(tcpHeader->th_dport);
}
break;
}
case IPPROTO_UDP: {
m_transportProtocol = TransportProtocolType::Udp;
if (dataLength >= int32_t(sizeof(udphdr))) {
const udphdr *udpHeader = reinterpret_cast<const udphdr *>(data);
m_sourceAddress.port = ntohs(udpHeader->uh_sport);
m_destinationAddress.port = ntohs(udpHeader->uh_dport);
}
break;
}
default:
m_transportProtocol = TransportProtocolType::Unknown;
break;
}
}
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