/*
    PIP - Platform Independent Primitives
    Ethernet, UDP/TCP Broadcast/Multicast
    Copyright (C) 2013  Ivan Pelipenko peri4ko@gmail.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/>.
*/

#include "piethernet.h"


PIEthernet::PIEthernet(void * data, ReadRetFunc slot): PIIODevice("", ReadWrite) {
	piMonitor.ethernets++;
	setPriority(piHigh);
	type_ = UDP;
	ret_data_ = data;
	ip_ = ip_s = "";
	port_ = port_s = 0;
	sock = sock_s = -1;
	ret_func_ = slot;
	connected_ = false;
	params = PIEthernet::ReuseAddress;
	server_thread_.setData(this);
	setThreadedReadBufferSize(65536);
	if (type_ != UDP) init();
}


PIEthernet::PIEthernet(PIEthernet::Type type, void * data, ReadRetFunc slot): PIIODevice("", ReadWrite) {
	piMonitor.ethernets++;
	setPriority(piHigh);
	type_ = type;
	ret_data_ = data;
	ip_ = ip_s = "";
	port_ = port_s = 0;
	sock = sock_s = -1;
	ret_func_ = slot;
	connected_ = false;
	params = (type == UDP ? PIEthernet::ReuseAddress : 0);
	server_thread_.setData(this);
	setThreadedReadBufferSize(65536);
	if (type_ != UDP) init();
}


PIEthernet::PIEthernet(int sock_, PIString ip_port): PIIODevice("", ReadWrite) {
	piMonitor.ethernets++;
	setPriority(piHigh);
	type_ = TCP_Client;
	path_ = ip_port;
	parseAddress(ip_port, &ip_s, &port_s);
	sock = sock_;
	sock_s = -1;
	server_thread_.setData(this);
	params = PIEthernet::ReuseAddress;
	init_ = opened_ = connected_ = true;
	setThreadedReadBufferSize(65536);
}


PIEthernet::~PIEthernet() {
	piMonitor.ethernets--;
	if (server_thread_.isRunning()) server_thread_.terminate();
	closeSocket(sock);
	//if (buffer_ != 0) delete buffer_;
	//buffer_ = 0;
}


bool PIEthernet::init() {
	//cout << "init " << type_ << endl;
	closeSocket(sock);
	int st = 0, pr = 0;;
#ifdef WINDOWS
	int flags = 0;
#else
	int so = 1;
#endif
	if (type_ == UDP) {
		st = SOCK_DGRAM;
		pr = IPPROTO_UDP;
	} else {
		st = SOCK_STREAM;
		pr = IPPROTO_TCP;
	}
#ifdef WINDOWS
	if (type_ == UDP) flags = WSA_FLAG_MULTIPOINT_C_LEAF | WSA_FLAG_MULTIPOINT_D_LEAF;
	if (params[ReuseAddress]) flags |= WSA_FLAG_OVERLAPPED;
	sock = WSASocket(AF_INET, st, pr, NULL, 0, flags);
#else
	sock = socket(AF_INET, st, pr);
#endif
	if (sock == -1) {
		piCout << "[PIEthernet] Cant`t create socket, " << ethErrorString();
		return false;
	}
#ifndef WINDOWS
	if (params[PIEthernet::ReuseAddress]) setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &so, sizeof(so));
	if (params[PIEthernet::Broadcast]) setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &so, sizeof(so));
#endif
	//cout << "inited " << sock << ": bc = " << params << endl;
	//fcntl(sock, F_SETFL, 0/*O_NONBLOCK*/);
	return true;
}


void PIEthernet::parseAddress(const PIString & ipp, PIString * ip, int * port) {
	if (ip != 0) *ip = ipp.left(ipp.find(":"));
	if (port != 0) *port = ipp.right(ipp.length() - ipp.find(":") - 1).toInt();
}


bool PIEthernet::openDevice() {
	if (connected_) return true;
	init();
	if (sock == -1 || path_.isEmpty()) return false;
	parseAddress(path_, &ip_, &port_);
	if (type_ != UDP)
		return true;
	//cout << " bind to " << sock << ": " << (params[PIEthernet::Broadcast] ? "0.0.0.0" : path_) << ": " << port_ << " ..." <<endl;
	memset(&addr_, 0, sizeof(addr_));
	addr_.sin_family = AF_INET;
	addr_.sin_port = htons(port_);
	if (params[PIEthernet::Broadcast]) addr_.sin_addr.s_addr = INADDR_ANY;
	else addr_.sin_addr.s_addr = inet_addr(ip_.data());
#ifdef QNX
	addr_.sin_len = sizeof(addr_);
#endif
	int tries = 0;
	while ((bind(sock, (sockaddr * )&addr_, sizeof(addr_)) == -1) && (tries < 10)) {
		init();
		tries++;
	}
	if (tries == 10) {
		piCout << "[PIEthernet] Cant`t bind to " << ip_ << ":" << port_ << ", " << ethErrorString();
		return false;
	}
	opened_ = true;
	while (!mcast_queue.isEmpty())
		joinMulticastGroup(mcast_queue.dequeue());
	//cout << "!" << endl;
	return true;
}


bool PIEthernet::closeDevice() {
	//cout << "close\n";
	if (sock != -1) shutdown(sock, SHUT_RDWR);
	closeSocket(sock);
	piForeach (PIEthernet * i, clients_)
		delete i;
	clients_.clear();
	if (server_thread_.isRunning()) server_thread_.terminate();
	if (connected_) disconnected(false);
	connected_ = false;
	return true;
}


bool PIEthernet::joinMulticastGroup(const PIString & group) {
	if (sock == -1) init();
	if (sock == -1) return false;
	if (type_ != UDP) {
		piCout << "[PIEthernet] Only UDP sockets can join multicast groups";
		return false;
	}
	if (!opened_) {
		if (mcast_queue.has(group))
			return false;
		mcast_queue.enqueue(group);
		return true;
	}
#ifdef WINDOWS
	parseAddress(path_, &ip_, &port_);
	memset(&addr_, 0, sizeof(addr_));
	addr_.sin_family = AF_INET;
	addr_.sin_port = htons(port_);
	addr_.sin_addr.s_addr = inet_addr(group.data());
	SOCKET ret = WSAJoinLeaf(sock, (sockaddr *)&addr_, sizeof(addr_), NULL, NULL, NULL, NULL, JL_BOTH);
	if (ret == INVALID_SOCKET) {
		piCout << "[PIEthernet] Cant`t join multicast group " << group << ", " << ethErrorString();
		return false;
	}
	leafs.insert(group, ret);
#else
#  ifndef QNX
	if (!params[Broadcast])
		piCout << "[PIEthernet] Warning: \"Broadcast\" parameter not set, \"joinMulticastGroup(\"" << group << "\")\" may be useless!";
	parseAddress(path_, &ip_, &port_);
	struct ip_mreqn mreq;
	memset(&mreq, 0, sizeof(mreq));
	/*if (params[PIEthernet::Broadcast]) mreq.imr_address.s_addr = INADDR_ANY;
	else*/ mreq.imr_address.s_addr = inet_addr(ip_.data());
	mreq.imr_multiaddr.s_addr = inet_addr(group.data());
	mreq.imr_ifindex = 0;
	if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) == -1) {
		piCout << "[PIEthernet] Cant`t join multicast group " << group << ", " << ethErrorString();
		return false;
	}
#  endif
#endif
	return true;
}


bool PIEthernet::leaveMulticastGroup(const PIString & group) {
	if (sock == -1) init();
	if (sock == -1) return false;
	if (type_ != UDP) {
		piCout << "[PIEthernet] Only UDP sockets can leave multicast groups";
		return false;
	}
#ifdef WINDOWS
	SOCKET s = leafs[group];
	if (s != SOCKET()) {
		leafs.erase(group);
		closesocket(s);
	}
#else
#  ifndef QNX
	parseAddress(path_, &ip_, &port_);
	struct ip_mreqn mreq;
	memset(&mreq, 0, sizeof(mreq));
	if (params[PIEthernet::Broadcast]) mreq.imr_address.s_addr = INADDR_ANY;
	else mreq.imr_address.s_addr = inet_addr(ip_.data());
	mreq.imr_multiaddr.s_addr = inet_addr(group.data());
	mreq.imr_ifindex = 0;
	if (setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) == -1) {
		piCout << "[PIEthernet] Cant`t leave multicast group " << group << ", " << ethErrorString();
		return false;
	}
#endif
#endif
	return true;
}


bool PIEthernet::connect() {
	if (sock == -1) return false;
	memset(&addr_, 0, sizeof(addr_));
	parseAddress(path_, &ip_, &port_);
	addr_.sin_port = htons(port_);
	addr_.sin_addr.s_addr = inet_addr(ip_.data());
	addr_.sin_family = AF_INET;
#ifdef QNX
	addr_.sin_len = sizeof(addr_);
#endif
	//piCout << "[PIEthernet] connect to " << ip << ":" << port_;
	connected_ = (::connect(sock, (sockaddr * )&addr_, sizeof(addr_)) == 0);
	if (!connected_)
		piCout << "[PIEthernet] Cant`t connect to " << ip_ << ":" << port_ << ", " << ethErrorString();
	opened_ = connected_;
	if (connected_) connected();
	return connected_;
}


bool PIEthernet::listen() {
	if (sock == -1) init();
	if (sock == -1) return false;
	parseAddress(path_, &ip_, &port_);
	memset(&addr_, 0, sizeof(addr_));
	addr_.sin_port = htons(port_);
	addr_.sin_addr.s_addr = inet_addr(ip_.data());
	addr_.sin_family = AF_INET;
#ifdef QNX
	addr_.sin_len = sizeof(addr_);
#endif
	int tries = 0;
	while ((bind(sock, (sockaddr * )&addr_, sizeof(addr_)) == -1) && (tries < 10)) {
		init();
		tries++;
	}
	if (tries == 10) {
		piCout << "[PIEthernet] Cant`t bind to " << ip_ << ":" << port_ << ", " << ethErrorString();
		return false;
	}
	if (::listen(sock, 64) == -1) {
		piCout << "[PIEthernet] Can`t listen on "<< ip_ << ":" << port_ << ", " << ethErrorString();
		return false;
	}
	//piCout << "[PIEthernet] listen on " << ip_ << ":" << port_;
	server_thread_.start(server_func);
	return true;
}


int PIEthernet::read(void * read_to, int max_size) {
	//cout << "read " << sock << endl;
	if (sock == -1) init();
	if (sock == -1 || read_to == 0) return -1;
	int rs = 0, s = 0;
	sockaddr_in client_addr;
	socklen_t slen = sizeof(client_addr);
	//piCout << "[PIEthernet] read from " << ip_ << ":" << port_ << endl;
	switch (type_) {
	case TCP_SingleTCP:
		::listen(sock, 64);
		s = accept(sock, (sockaddr * )&client_addr, &slen);
		if (s == -1) {
			piCout << "[PIEthernet] Cant`t accept new connection, " << ethErrorString();
			return -1;
		}
		rs = recv(s, (char * )read_to, max_size, 0);
		closeSocket(s);
		return rs;
	case TCP_Client:
		if (!connected_) return -1;
	case UDP:
#ifdef WINDOWS
		rs = recv(sock, (char * )read_to, max_size, 0);
#else
		rs = recv(sock, read_to, max_size, 0);
#endif
		piCout << "eth" << path_ << "read return" << rs << errno;
		if (rs <= 0) {
			connected_ = false;
			disconnected(rs < 0);
			piCout << "eth" << path_ << "disconnected";
		}
		if (rs > 0) received(read_to, rs);
		return rs;
		//return ::read(sock, read_to, max_size);
	default: break;
		//return ::read(sock, (char * )read_to, max_size);
	}
	return -1;
}


int PIEthernet::write(const void * data, int max_size) {
	if (sock == -1) init();
	if (sock == -1 || !isWriteable()) {
		//piCout << "[PIEthernet] Can`t send to uninitialized socket";
		return -1;
	}
	//piCout << "[PIEthernet] sending to " << ip_s << ":" << port_s << "  " << max_size << " bytes";
	int ret = 0;
	switch (type_) {
	case TCP_SingleTCP:
		memset(&addr_, 0, sizeof(addr_));
		addr_.sin_port = htons(port_s);
		addr_.sin_addr.s_addr = inet_addr(ip_s.data());
		addr_.sin_family = AF_INET;
#ifdef QNX
		addr_.sin_len = sizeof(addr_);
#endif
		//piCout << "connect SingleTCP" << ip_s << ":" << port_s << "...";
		if (::connect(sock, (sockaddr * )&addr_, sizeof(addr_)) != 0) {
			piCout << "[PIEthernet] Cant`t connect to " << ip_s << ":" << port_s << ", " << ethErrorString();
			return -1;
		}
		//piCout << "ok, write SingleTCP" << int(data) << max_size << "bytes ...";
		ret = ::send(sock, (const char *)data, max_size, 0);
		//piCout << "ok, ret" << ret;
		closeSocket(sock);
		init();
		return ret;
	case UDP:
		saddr_.sin_port = htons(port_s);
		if (params[PIEthernet::Broadcast]) saddr_.sin_addr.s_addr = INADDR_BROADCAST;
		else saddr_.sin_addr.s_addr = inet_addr(ip_s.data());
		saddr_.sin_family = AF_INET;
#ifdef WINDOWS
		return sendto(sock, (const char * )data, max_size, 0, (sockaddr * )&saddr_, sizeof(saddr_));
#else
		return sendto(sock, data, max_size, 0, (sockaddr * )&saddr_, sizeof(saddr_));
#endif
	case TCP_Client:
		return ::send(sock, (const char *)data, max_size, 0);
	default: break;
		//return ::read(sock, read_to, max_size);
	}
	return -1;
}

void PIEthernet::server_func(void * eth) {
	PIEthernet * ce = (PIEthernet * )eth;
	sockaddr_in client_addr;
	socklen_t slen = sizeof(client_addr);
	int s = accept(ce->sock, (sockaddr * )&client_addr, &slen);
	if (s == -1) {
		piCout << "[PIEthernet] Cant`t accept new connection, " << ethErrorString();
		return;
	}
	PIString ip(inet_ntoa(client_addr.sin_addr));
	ip += ":" + PIString::fromNumber(htons(client_addr.sin_port));
	ce->clients_ << new PIEthernet(s, ip);
	ce->newConnection(ce->clients_.back());
	//cout << "connected " << ip << endl;
	//char d[256];
	//cout << " recv " << recv(s, d, 256, 0) << endl;
	//cout << recv(ce->clients_.back()->sock, d, 256, 0) << endl;

}


PIStringList PIEthernet::interfaces() {
#ifdef WINDOWS
	piCout << "[PIEthernet] Not implemented on Windows, use \"PIEthernet::allAddresses\" instead";
	return PIStringList();
#else
#  ifdef QNX
	PIStringList il, sl;
	/*struct if_nameindex * ni = if_nameindex();
	for (int i = 0; ; ++i) {
		if (ni[i].if_name == 0 || ni[i].if_index == 0) break;
		sl << PIString(ni[i].if_name);
	}
	if_freenameindex(ni);*/
	PIProcess proc;
	proc.setGrabOutput(true);
	proc.exec(ifconfigPath.c_str(), "-l");
	if (!proc.waitForFinish(1000)) return sl;
	PIString out(proc.readOutput());
	il = out.split(" ");
	il.removeAll("");
	piForeachC (PIString & i, il) {
		proc.exec(ifconfigPath.c_str(), i);
		if (!proc.waitForFinish(1000)) return il;
		sl << i.trimmed();
		out = proc.readOutput();
		int al = out.length();
		al = (al - out.replaceAll("alias", "").length()) / 5;
		for (int j = 0; j < al; ++j)
			sl << i.trimmed() + ":" + PIString::fromNumber(j);
	}
	//cout << out;
	//cout << sl << endl;
	return sl;
#  else
	PIStringList sl;
	/*struct if_nameindex * ni = if_nameindex();
	for (int i = 0; ; ++i) {
		if (ni[i].if_name == 0 || ni[i].if_index == 0) break;
		sl << PIString(ni[i].if_name);
	}
	if_freenameindex(ni);*/
	PIProcess proc;
	proc.setGrabOutput(true);
	proc.exec(ifconfigPath.c_str(), "-s");
	if (!proc.waitForFinish(1000)) return sl;
	PIString out(proc.readOutput());
	//cout << out << endl;
	out.cutLeft(out.find('\n') + 1);
	while (!out.isEmpty()) {
		sl << out.left(out.find(' '));
		out.cutLeft(out.find('\n') + 1);
	}
	//cout << sl << endl;
	return sl;
#  endif
#endif
}


PIString PIEthernet::interfaceAddress(const PIString & interface_) {
#ifdef WINDOWS
	piCout << "[PIEthernet] Not implemented on Windows, use \"PIEthernet::allAddresses\" instead";
	return PIString();
#else
	struct ifreq ifr;
	memset(&ifr, 0, sizeof(ifr));
	strcpy(ifr.ifr_name, interface_.data());
	int s = socket(AF_INET, SOCK_DGRAM, 0);
	ioctl(s, SIOCGIFADDR, &ifr);
	::close(s);
	struct sockaddr_in * sa = (struct sockaddr_in * )&ifr.ifr_addr;
	return PIString(inet_ntoa(sa->sin_addr));
#endif

}


PIStringList PIEthernet::allAddresses() {
#ifdef WINDOWS
	PIStringList al;
	PIString ca;
	PIP_ADAPTER_INFO pAdapterInfo, pAdapter = 0;
	int ret = 0;
	ulong ulOutBufLen = sizeof(IP_ADAPTER_INFO);
	pAdapterInfo = (IP_ADAPTER_INFO * ) HeapAlloc(GetProcessHeap(), 0, (sizeof (IP_ADAPTER_INFO)));
	if (pAdapterInfo == 0) {
		piCout << "[PIEthernet] Error allocating memory needed to call GetAdaptersinfo";
		return PIStringList();
	}
	if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
		HeapFree(GetProcessHeap(), 0, (pAdapterInfo));
		pAdapterInfo = (IP_ADAPTER_INFO *) HeapAlloc(GetProcessHeap(), 0, (ulOutBufLen));
		if (pAdapterInfo == 0) {
			piCout << "[PIEthernet] Error allocating memory needed to call GetAdaptersinfo";
			return PIStringList();
		}
	}
	if ((ret = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {
		pAdapter = pAdapterInfo;
		while (pAdapter) {
			/*if (pAdapter->Type != MIB_IF_TYPE_ETHERNET && pAdapter->Type != MIB_IF_TYPE_LOOPBACK) {
				pAdapter = pAdapter->Next;
				continue;
			}*/
			ca = PIString(pAdapter->IpAddressList.IpAddress.String);
			if (ca != "0.0.0.0") al << ca;
			pAdapter = pAdapter->Next;
		}
	} else
		piCout << "[PIEthernet] GetAdaptersInfo failed with error: " << ret;
	if (pAdapterInfo)
		HeapFree(GetProcessHeap(), 0, (pAdapterInfo));
	return al;
#else
	PIStringList il = interfaces(), al;
	piForeachC (PIString & i, il)
		al << interfaceAddress(i);
	return al.removeStrings("0.0.0.0");
#endif
}