/*
 * ZeroTier One - Global Peer to Peer Ethernet
 * Copyright (C) 2011-2014  ZeroTier Networks LLC
 *
 * 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/>.
 *
 * --
 *
 * ZeroTier may be used and distributed under the terms of the GPLv3, which
 * are available at: http://www.gnu.org/licenses/gpl-3.0.html
 *
 * If you would like to embed ZeroTier into a commercial application or
 * redistribute it in a modified binary form, please contact ZeroTier Networks
 * LLC. Start here: http://www.zerotier.com/
 */

#include "NodeControlClient.hpp"
#include "../node/Constants.hpp"
#include "../node/Utils.hpp"
#include "../node/Defaults.hpp"
#include "IpcConnection.hpp"
#include "IpcListener.hpp"
#include "NodeControlService.hpp"

namespace ZeroTier {

struct _NodeControlClientImpl
{
	void (*resultHandler)(void *,const char *);
	void *arg;
	bool ignoreNextBreak;
	IpcConnection *ipcc;
	std::string err;
};

static void _CBipcResultHandler(void *arg,IpcConnection *ipcc,IpcConnection::EventType event,const char *result)
{
	if ((event == IpcConnection::IPC_EVENT_COMMAND)&&(result)) {
		if (!strcmp(result,"200 auth OK")) {
			((_NodeControlClientImpl *)arg)->ignoreNextBreak = true;
		} else if ((((_NodeControlClientImpl *)arg)->ignoreNextBreak)&&(!strcmp(result,"."))) {
			((_NodeControlClientImpl *)arg)->ignoreNextBreak = false;
		} else ((_NodeControlClientImpl *)arg)->resultHandler(((_NodeControlClientImpl *)arg)->arg,result);
	}
}

NodeControlClient::NodeControlClient(const char *ep,const char *authToken,void (*resultHandler)(void *,const char *),void *arg)
	throw() :
	_impl((void *)new _NodeControlClientImpl)
{
	_NodeControlClientImpl *impl = (_NodeControlClientImpl *)_impl;
	impl->resultHandler = resultHandler;
	impl->arg = arg;
	impl->ignoreNextBreak = false;
	try {
		impl->ipcc = new IpcConnection(ep,ZT_IPC_TIMEOUT,&_CBipcResultHandler,_impl);
		impl->ipcc->printf("auth %s"ZT_EOL_S,authToken);
	} catch ( ... ) {
		impl->ipcc = (IpcConnection *)0;
		impl->err = "failure connecting to running ZeroTier One service";
	}
}

NodeControlClient::~NodeControlClient()
{
	if (_impl) {
		delete ((_NodeControlClientImpl *)_impl)->ipcc;
		delete (_NodeControlClientImpl *)_impl;
	}
}

const char *NodeControlClient::error() const
	throw()
{
	if (((_NodeControlClientImpl *)_impl)->err.length())
		return ((_NodeControlClientImpl *)_impl)->err.c_str();
	return (const char *)0;
}

void NodeControlClient::send(const char *command)
	throw()
{
	try {
		if (((_NodeControlClientImpl *)_impl)->ipcc)
			((_NodeControlClientImpl *)_impl)->ipcc->printf("%s"ZT_EOL_S,command);
	} catch ( ... ) {}
}

std::vector<std::string> NodeControlClient::splitLine(const char *line)
{
	return Utils::split(line," ","\\","\"");
}

const char *NodeControlClient::authTokenDefaultUserPath()
{
	static std::string dlp;
	static Mutex dlp_m;

	Mutex::Lock _l(dlp_m);

#ifdef __WINDOWS__

	if (!dlp.length()) {
		char buf[16384];
		if (SUCCEEDED(SHGetFolderPathA(NULL,CSIDL_APPDATA,NULL,0,buf)))
			dlp = (std::string(buf) + "\\ZeroTier\\One\\authtoken.secret");
	}

#else // not __WINDOWS__

	if (!dlp.length()) {
		const char *home = getenv("HOME");
		if (home) {
#ifdef __APPLE__
			dlp = (std::string(home) + "/Library/Application Support/ZeroTier/One/authtoken.secret");
#else
			dlp = (std::string(home) + "/.zeroTierOneAuthToken");
#endif
		}
	}

#endif // __WINDOWS__ or not __WINDOWS__

	return dlp.c_str();
}

std::string NodeControlClient::getAuthToken(const char *path,bool generateIfNotFound)
{
	unsigned char randbuf[24];
	std::string token;

	if (Utils::readFile(path,token))
		return Utils::trim(token);
	else token = "";

	if (generateIfNotFound) {
		Utils::getSecureRandom(randbuf,sizeof(randbuf));
		for(unsigned int i=0;i<sizeof(randbuf);++i)
			token.push_back(("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")[(unsigned int)randbuf[i] % 62]);
		if (!Utils::writeFile(path,token))
			return std::string();
		Utils::lockDownFile(path,false);
	}

	return token;
}

} // namespace ZeroTier