#ifndef _NETWORKINTERFACE_H_
#define _NETWORKINTERFACE_H_
// todo: figure out how to create a network interface device, and copy data to it.
//
//   easiest is probably to use a 'tap' device ( provided by the kext already loaded by openvpn/tunnelblick )
//


#include <fcntl.h>
#include <stdint.h>
#include "err/posix.h"
#include "stringutils.h"

class network_interface {
    int _tap;
    int _tapnum;
public:
    network_interface()
    {
        for (int i=0 ; i<16 ; i++) {
            _tap= open(stringformat("/dev/tap%d", i).c_str(), O_RDWR);
            if (_tap!=-1) {
                _tapnum= i;
                break;
            }
        }
        if (_tap==-1)
            throw posixerror("open /dev/tap");

        // device = 169.254.2.1
        // pc = 169.254.2.2
        system(stringformat("ifconfig tap%d up 169.254.2.2 netmask 255.255.255.0", _tapnum).c_str());
    }
    ~network_interface()
    {
        close(_tap);
    }
    void setlladdr(const ByteVector& addr)
    {
        if (addr.size()!=6)
            throw "setlladdr";
        system(stringformat("ifconfig tap%d lladdr %02x:%02x:%02x:%02x:%02x:%02x", _tapnum, addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]).c_str());
    }
    size_t readpacket(uint8_t *p, size_t n)
    {
        return read(_tap, p, n);
    }
    bool sendpacket(const uint8_t *p, size_t n)
    {
        if (-1==write(_tap, p, n))
            return false;
        return true;
    }
};
#endif