/*
	IfMan.cpp
	
	Interface Manager for Aladin
	Copyright (C) 2003 Mike Saywell
	
	Southampton Open Wireless Network,
	http://www.sown.org.uk

	~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

	This class controls which interfaces Aladin runs on, in
	particular it will dynmaically add and remove entries for HostAP
	WDS interfaces.

	It is responsible for creating, starting and stopping the
	RevArpDaemon processes.

	~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

	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 2
	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, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 

*/

#include "IfMan.h"

IfMan::IfMan(AddressManager* addrMan) {
	this->addrMan = NULL;
	this->addrMan = addrMan;
}

void* IfMan::dowdsMonitor(struct Wrapper* wrap) {

	char* hostap_dev = wrap->dev;
	if (DEBUG) {
		cout << "Monitoring hostap device " << hostap_dev << endl;
	}

	char line[256];
	char wdsPath[128];
	wdsPath[0] = '\0';
	strcat(wdsPath, "/proc/net/hostap/");
	strcat(wdsPath, hostap_dev);
	strcat(wdsPath, "/wds");

	ifstream wdsFile;

	if (!wdsFile) {
		cerr << "FATAL: Failed to open " << wdsPath << " for reading.\n";
		exit(1);
	}

	while(wrap->run) {
		wdsFile.open(wdsPath);
		// Poll for changes in link status
		// Return pointer to beginning
		wdsFile.clear();
		wdsFile.seekg(0, ios::beg);

		if (DEBUG) {
			cout << endl;
			cout << "Polling interfaces..." << endl;
		}

		while (wdsFile.getline(line, 256)) {
			string interface(strtok(line, " \t"));

			// Drop remaining tokens on the line
			while(strtok(NULL, " \t"));

			if(ifmap[interface] && ifmap[interface]->rARPd->isRunning()) {
				continue;
			}
			else {
				this->enable((char *) interface.c_str());
			}
		}
		wdsFile.close();
		sleep(5);
	}
	delete wrap;
}

void IfMan::enable(char* if_name) {
	if (DEBUG) {
		cout << "Enabling aladin on interface " << if_name << endl;
	}

	string iface(if_name);

	if(ifmap[iface] && ifmap[iface]->rARPd->isRunning()) {
		cerr << "Interface manager already running on " << if_name << "!";
		return;
	}

	ifmap[iface] = new struct Interface;
	ifmap[iface]->if_index = if_nametoindex(if_name);

	ifmap[if_name]->rARPd = new RevArpDaemon(this->addrMan, ifmap[iface]->if_index);
	ifmap[if_name]->rARPd->start();
}
	
void IfMan::disable(char* if_name) {
	if (DEBUG) {
		cout << "Disabling aladin on interface " << if_name << endl;
	}
	cout << "Not implemented!" << endl;

}

void IfMan::wdsMonitor(char* if_name) {
	struct Wrapper* wrap = new struct Wrapper;
	strncpy(wrap->dev, if_name, 256);
	wrap->ifman = this;
	wrap->run = true;
	pthread_create(&wrap->thread, NULL, &imLauncher, wrap);
}

void* imLauncher(void *obj) {
	struct Wrapper* foo = (struct Wrapper*) obj;
	return static_cast<IfMan*>(foo->ifman)->dowdsMonitor(foo);
}