// ndppd - NDP Proxy Daemon
// Copyright (C) 2011  Daniel Adolfsson <daniel.adolfsson@tuhox.com>
//
// This program 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.
//
// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#ifndef __NDPPD_IFACE_H
#define __NDPPD_IFACE_H

#include <string>
#include <list>
#include <vector>
#include <map>

#include <sys/poll.h>
#include <net/ethernet.h>

#include "ndppd.h"

__NDPPD_NS_BEGIN

class session;
class proxy;

class iface
{
private:
   // Weak pointer so this object can reference itself.
   weak_ptr<iface> _ptr;

   static std::map<std::string, strong_ptr<iface> > _map;

   // An array of objects used with ::poll.
   static std::vector<struct pollfd> _pollfds;

   // Updates the array above.
   static void fixup_pollfds();

   // The "generic" ICMPv6 socket for reading/writing NB_NEIGHBOR_ADVERT
   // messages as well as writing NB_NEIGHBOR_SOLICIT messages.
   int _ifd;

   // This is the PF_PACKET socket we use in order to read
   // NB_NEIGHBOR_SOLICIT messages.
   int _pfd;

   // Previous state of ALLMULTI for the interface.
   int _prev_allmulti;

   // Name of this interface.
   std::string _name;

   // An array of sessions that are monitoring this interface for
   // ND_NEIGHBOR_ADVERT messages.
   std::list<weak_ptr<session> > _sessions;

   strong_ptr<proxy> _pr;

   // The link-layer address of this interface.
   struct ether_addr hwaddr;

   // Turns on/off ALLMULTI for this interface - returns the previous state
   // or -1 if there was an error.
   int allmulti(int state);

   // Constructor.
   iface();

public:

   // Destructor.
   ~iface();

   static strong_ptr<iface> open_ifd(const std::string& name);

   static strong_ptr<iface> open_pfd(const std::string& name);

   static int poll_all();

   static ssize_t read(int fd, struct sockaddr *saddr, uint8_t *msg, size_t size);

   static ssize_t write(int fd, const address& daddr, const uint8_t *msg, size_t size);

   // Writes a NB_NEIGHBOR_SOLICIT message to the _ifd socket.
   ssize_t write_solicit(const address& taddr);

   // Writes a NB_NEIGHBOR_ADVERT message to the _ifd socket;
   ssize_t write_advert(const address& daddr, const address& taddr, bool router);

   // Reads a NB_NEIGHBOR_SOLICIT message from the _pfd socket.
   ssize_t read_solicit(address& saddr, address& daddr, address& taddr);

   // Reads a NB_NEIGHBOR_ADVERT message from the _ifd socket;
   ssize_t read_advert(address& saddr, address& taddr);

   // Returns the name of the interface.
   const std::string& name() const;

   // Adds a session to be monitored for ND_NEIGHBOR_ADVERT messages.
   void add_session(const strong_ptr<session>& se);

   void remove_session(const strong_ptr<session>& se);

   void pr(const strong_ptr<proxy>& pr);

   const strong_ptr<proxy>& pr() const;
};

__NDPPD_NS_END

#endif // __NDPPD_IFACE_H