/*
 * ZeroTier One - Network Virtualization Everywhere
 * Copyright (C) 2011-2015  ZeroTier, Inc.
 *
 * 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 <stdio.h>
#include <string.h>
#include <stdint.h>

#include <string>

#include "Constants.hpp"
#include "InetAddress.hpp"
#include "Utils.hpp"

namespace ZeroTier {

const InetAddress InetAddress::LO4("127.0.0.1",0);
const InetAddress InetAddress::LO6("::1",0);
const InetAddress InetAddress::DEFAULT4((uint32_t)0,0);
const InetAddress InetAddress::DEFAULT6((const void *)0,16,0);

void InetAddress::set(const std::string &ip,unsigned int port)
	throw()
{
	if (ip.find(':') != std::string::npos) {
		struct sockaddr_in6 sin6;
		memset(&sin6,0,sizeof(sin6));
		sin6.sin6_family = AF_INET6;
		sin6.sin6_port = Utils::hton((uint16_t)port);
		if (inet_pton(AF_INET6,ip.c_str(),(void *)&(sin6.sin6_addr.s6_addr)) <= 0)
			memset(this,0,sizeof(InetAddress));
		else *this = sin6;
	} else {
		struct sockaddr_in sin;
		memset(&sin,0,sizeof(sin));
		sin.sin_family = AF_INET;
		sin.sin_port = Utils::hton((uint16_t)port);
		if (inet_pton(AF_INET,ip.c_str(),(void *)&(sin.sin_addr.s_addr)) <= 0)
			memset(this,0,sizeof(InetAddress));
		else *this = sin;
	}
}

void InetAddress::set(const void *ipBytes,unsigned int ipLen,unsigned int port)
	throw()
{
	memset(this,0,sizeof(InetAddress));
	if (ipLen == 4) {
		setV4();
		if (ipBytes)
			memcpy(rawIpData(),ipBytes,4);
		setPort(port);
	} else if (ipLen == 16) {
		setV6();
		if (ipBytes)
			memcpy(rawIpData(),ipBytes,16);
		setPort(port);
	}
}

bool InetAddress::isLinkLocal() const
	throw()
{
	static const unsigned char v6llPrefix[8] = { 0xfe,0x80,0x00,0x00,0x00,0x00,0x00,0x00 };
	switch(ss_family) {
		case AF_INET:
			return ((Utils::ntoh((uint32_t)reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr) & 0xffff0000) == 0xa9fe0000);
		case AF_INET6:
			return (memcmp(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr,v6llPrefix,8) == 0);
	}
	return false;
}

std::string InetAddress::toString() const
{
	char buf[128];
	switch(ss_family) {
		case AF_INET:
			Utils::snprintf(buf,sizeof(buf),"%d.%d.%d.%d/%d",
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[0],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[1],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[2],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[3],
					(int)Utils::ntoh((uint16_t)(reinterpret_cast<const struct sockaddr_in *>(this)->sin_port))
				);
			return std::string(buf);
		case AF_INET6:
			Utils::snprintf(buf,sizeof(buf),"%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x/%d",
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[0]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[1]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[2]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[3]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[4]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[5]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[6]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[7]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[8]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[9]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[10]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[11]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[12]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[13]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[14]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[15]),
					(int)Utils::ntoh((uint16_t)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_port))
				);
			return std::string(buf);
	}
	return std::string();
}

std::string InetAddress::toIpString() const
{
	char buf[128];
	switch(ss_family) {
		case AF_INET:
			Utils::snprintf(buf,sizeof(buf),"%d.%d.%d.%d",
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[0],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[1],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[2],
					(int)(reinterpret_cast<const unsigned char *>(&(reinterpret_cast<const struct sockaddr_in *>(this)->sin_addr.s_addr)))[3]
				);
			return std::string(buf);
		case AF_INET6:
			Utils::snprintf(buf,sizeof(buf),"%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x:%.2x%.2x",
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[0]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[1]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[2]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[3]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[4]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[5]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[6]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[7]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[8]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[9]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[10]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[11]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[12]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[13]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[14]),
					(int)(reinterpret_cast<const struct sockaddr_in6 *>(this)->sin6_addr.s6_addr[15])
				);
			return std::string(buf);
	}
	return std::string();
}

void InetAddress::fromString(const std::string &ipSlashPort)
{
	std::size_t slashAt = ipSlashPort.find('/');
	if ((slashAt == std::string::npos)||(slashAt >= ipSlashPort.length()))
		set(ipSlashPort,0);
	else {
		long p = strtol(ipSlashPort.substr(slashAt+1).c_str(),(char **)0,10);
		if ((p > 0)&&(p <= 0xffff))
			set(ipSlashPort.substr(0,slashAt),(unsigned int)p);
		else set(ipSlashPort.substr(0,slashAt),0);
	}
}

InetAddress InetAddress::netmask() const
	throw()
{
	InetAddress r(*this);
	switch(r.ss_family) {
		case AF_INET:
			reinterpret_cast<struct sockaddr_in *>(&r)->sin_addr.s_addr = Utils::hton((uint32_t)(0xffffffff << (32 - netmaskBits())));
			break;
		case AF_INET6: {
			unsigned char *bf = reinterpret_cast<unsigned char *>(reinterpret_cast<struct sockaddr_in6 *>(&r)->sin6_addr.s6_addr);
			signed int bitsLeft = (signed int)netmaskBits();
			for(unsigned int i=0;i<16;++i) {
				if (bitsLeft > 0) {
					bf[i] |= (unsigned char)((bitsLeft >= 8) ? 0x00 : (0xff >> bitsLeft));
					bitsLeft -= 8;
				}
			}
		}	break;
	}
	return r;
}

InetAddress InetAddress::broadcast() const
	throw()
{
	InetAddress r(*this);
	switch(r.ss_family) {
		case AF_INET:
			reinterpret_cast<struct sockaddr_in *>(&r)->sin_addr.s_addr |= Utils::hton((uint32_t)(0xffffffff >> netmaskBits()));
			break;
		case AF_INET6: {
			unsigned char *bf = reinterpret_cast<unsigned char *>(reinterpret_cast<struct sockaddr_in6 *>(&r)->sin6_addr.s6_addr);
			signed int bitsLeft = (signed int)netmaskBits();
			for(unsigned int i=0;i<16;++i) {
				if (bitsLeft > 0) {
					bf[i] |= (unsigned char)((bitsLeft >= 8) ? 0x00 : (0xff >> bitsLeft));
					bitsLeft -= 8;
				}
			}
		}	break;
	}
	return r;
}

InetAddress InetAddress::makeIpv6LinkLocal(const MAC &mac)
	throw()
{
	struct sockaddr_in6 sin6;
	sin6.sin6_family = AF_INET6;
	sin6.sin6_addr.s6_addr[0] = 0xfe;
	sin6.sin6_addr.s6_addr[1] = 0x80;
	sin6.sin6_addr.s6_addr[2] = 0x00;
	sin6.sin6_addr.s6_addr[3] = 0x00;
	sin6.sin6_addr.s6_addr[4] = 0x00;
	sin6.sin6_addr.s6_addr[5] = 0x00;
	sin6.sin6_addr.s6_addr[6] = 0x00;
	sin6.sin6_addr.s6_addr[7] = 0x00;
	sin6.sin6_addr.s6_addr[8] = mac[0] & 0xfd;
	sin6.sin6_addr.s6_addr[9] = mac[1];
	sin6.sin6_addr.s6_addr[10] = mac[2];
	sin6.sin6_addr.s6_addr[11] = 0xff;
	sin6.sin6_addr.s6_addr[12] = 0xfe;
	sin6.sin6_addr.s6_addr[13] = mac[3];
	sin6.sin6_addr.s6_addr[14] = mac[4];
	sin6.sin6_addr.s6_addr[15] = mac[5];
	sin6.sin6_port = Utils::hton((uint16_t)64);
	return InetAddress(sin6);
}

} // namespace ZeroTier