#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "logging.h"
#include "module.h"
#include "netpkt.h"

NetPkt::NetPkt(const char* data, int size)
: data(data), used(size), size(0)
{
}

NetPkt::NetPkt(int size)
: used(0), size(size)
{
	data = new char[size];
}

NetPkt::~NetPkt()
{
	if (size > 0)
		delete data;
}

int NetPkt::show(char* buf, int size)
{
	return snprintf(buf, size, "(%s:%d) (%d/%d) bytes",
		inet_ntoa(this->addr.sin_addr),
		ntohs(this->addr.sin_port),
		this->used, this->size);
}

bool NetPkt::compare(int offset, const char* buf, int len)
{
	if (offset >= this->used)
		return false;

	/* nicht ueber das paket hinaus vergleichen */
	if (offset + len >= this->used)
		len = this->used - offset;

	return (memcmp(this->data + offset, buf, len) == 0);
}

int NetPkt::find(int offset, const char *buf, int len)
{
	if (offset >= this->used)
		return -1;

	void* found = memmem(this->data + offset, this->used, buf, len);

	return (found == NULL) ? -1 : ((char*)found - this->data);
}

void NetPkt::setAddress(struct sockaddr_in *tmp)
{
	memcpy(&addr, tmp, sizeof(addr));
}

struct sockaddr_in * NetPkt::getAddress()
{
	return &addr;
}