/
Packet.cpp
194 lines (169 loc) · 4.04 KB
/
Packet.cpp
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#include <stdint.h>
#include "TCPHeader.h"
#include "Packet.h"
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <sys/types.h>
Packet::Packet()
{
m_size = sizeof(struct TCPHeader);
clock_gettime(CLOCK_MONOTONIC, &m_time);
}
Packet::Packet(char *buf, unsigned int length)
{
memcpy((void *)&m_header, buf, sizeof(struct TCPHeader));
memcpy(data, buf + sizeof(struct TCPHeader), length - sizeof(struct TCPHeader));
m_size = length;
clock_gettime(CLOCK_MONOTONIC, &m_time);
}
void
Packet::copyIntoBuf(char *buf)
{
memcpy((void *)buf, (void *)&m_header, sizeof(struct TCPHeader));
memcpy((void *)(buf + sizeof(struct TCPHeader)), data, (m_size - sizeof(struct TCPHeader)));
}
void
Packet::copyHeaderIntoBuf(char *buf)
{
memcpy((void *)buf, (void *)&m_header, sizeof(struct TCPHeader));
}
bool
Packet::isSYN()
{
if (!getACK((struct TCPHeader *)&m_header) && getSYN((struct TCPHeader *)&m_header) && !getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
bool
Packet::isACK()
{
if (getACK((struct TCPHeader *)&m_header) && !getSYN((struct TCPHeader *)&m_header) && !getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
bool
Packet::isSYNACK()
{
if (getACK((struct TCPHeader *)&m_header) && getSYN((struct TCPHeader *)&m_header) && !getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
bool
Packet::isFIN()
{
if (!getACK((struct TCPHeader *)&m_header) && !getSYN((struct TCPHeader *)&m_header) && getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
bool
Packet::isFINACK()
{
if (getACK((struct TCPHeader *)&m_header) && !getSYN((struct TCPHeader *)&m_header) && getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
bool
Packet::isDATA()
{
if (!getACK((struct TCPHeader *)&m_header) && !getSYN((struct TCPHeader *)&m_header) && !getFIN((struct TCPHeader *)&m_header)) {
return true;
}
return false;
}
void
Packet::setHeaderFields(uint16_t newseqnum, uint16_t newacknum, uint16_t newwindow, bool ACK, bool SYN, bool FIN)
{
setFields((struct TCPHeader *)&m_header, newseqnum, newacknum, newwindow, ACK, SYN, FIN);
}
uint16_t
Packet::getSeqNumber()
{
return getSeqNum((struct TCPHeader *)&m_header);
}
uint16_t
Packet::getAckNumber()
{
return getAckNum((struct TCPHeader *)&m_header);
}
uint16_t
Packet::getWindowSize()
{
return getWindow((struct TCPHeader *)&m_header);
}
uint16_t
Packet::getExpectedAckNumber(int maxSeqNum)
{
uint16_t seqNum = getSeqNum((struct TCPHeader *)&m_header);
uint16_t payloadSize = m_size - sizeof(struct TCPHeader);
uint16_t expectedAckNum = seqNum + payloadSize;
if (expectedAckNum > maxSeqNum) {
expectedAckNum -= maxSeqNum;
}
return expectedAckNum;
}
void
Packet::printSeqReceive()
{
fprintf(stdout, "Receiving packet %u\n", getSeqNumber());
}
void
Packet::printSYNSend(bool retransmission)
{
fprintf(stdout, "Sending packet SYN");
if (retransmission) {
fprintf(stdout, " Retransmission");
}
fprintf(stdout, "\n");
}
void
Packet::printAckSend(bool retransmission, bool synflag, bool finflag)
{
fprintf(stdout, "Sending packet %u", getAckNumber());
if (retransmission) {
fprintf(stdout, " Retransmission");
}
if (synflag) {
fprintf(stdout, " SYN");
}
if (finflag) {
fprintf(stdout, " FIN");
}
fprintf(stdout, "\n");
}
void
Packet::printAckReceive()
{
fprintf(stdout, "Receiving packet %u\n", getAckNumber());
}
void
Packet::printSeqSend(unsigned int CWND, unsigned int SSThresh, bool retransmission, bool synflag, bool finflag)
{
fprintf(stdout, "Sending packet %u %u %u", getSeqNumber(), CWND, SSThresh);
if (retransmission) {
fprintf(stdout, " Retransmission");
}
if (synflag) {
fprintf(stdout, " SYN");
}
if (finflag) {
fprintf(stdout, " FIN");
}
fprintf(stdout, "\n");
}
bool
Packet::hasExpired(struct timespec now, int duration_ns)
{
int elapsed_time;
elapsed_time = (int) (((double)now.tv_sec*pow(10,9) + (double)now.tv_nsec) - ((double)m_time.tv_sec*pow(10,9) + (double)m_time.tv_nsec));
if (elapsed_time > duration_ns) {
return true;
}
return false;
}