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/*
* 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/
*/
#ifndef ZT_PATH_HPP
#define ZT_PATH_HPP
#include <stdint.h>
#include <string.h>
#include <stdexcept>
#include <string>
#include "Constants.hpp"
#include "InetAddress.hpp"
#include "Utils.hpp"
#include "Buffer.hpp"
#define ZT_PATH_SERIALIZATION_VERSION 2
namespace ZeroTier {
/**
* WAN address and protocol for reaching a peer
*/
class Path
{
public:
enum Type
{
PATH_TYPE_NULL = 0,
PATH_TYPE_UDP = 1,
PATH_TYPE_TCP_OUT = 2,
PATH_TYPE_TCP_IN = 3
};
Path() :
_lastSend(0),
_lastReceived(0),
_lastFirewallOpener(0),
_lastPing(0),
_addr(),
_type(PATH_TYPE_NULL),
_fixed(false) {}
Path(const Path &p)
{
// InetAddress is memcpy'able
memcpy(this,&p,sizeof(Path));
}
Path(const InetAddress &addr,Type t,bool fixed = false) :
_lastSend(0),
_lastReceived(0),
_lastFirewallOpener(0),
_lastPing(0),
_addr(addr),
_type(t),
_fixed(fixed) {}
inline Path &operator=(const Path &p)
{
if (this != &p)
memcpy(this,&p,sizeof(Path));
return *this;
}
inline const InetAddress &address() const throw() { return _addr; }
inline Type type() const throw() { return _type; }
inline bool tcp() const throw() { return ((_type == PATH_TYPE_TCP_IN)||(_type == PATH_TYPE_TCP_OUT)); }
inline uint64_t lastSend() const throw() { return _lastSend; }
inline uint64_t lastReceived() const throw() { return _lastReceived; }
inline uint64_t lastFirewallOpener() const throw() { return _lastFirewallOpener; }
inline uint64_t lastPing() const throw() { return _lastPing; }
inline bool fixed() const throw() { return _fixed; }
inline void setFixed(bool f) throw() { _fixed = f; }
inline void sent(uint64_t t) throw() { _lastSend = t; }
inline void received(uint64_t t) throw() { _lastReceived = t; }
inline void firewallOpenerSent(uint64_t t) throw() { _lastFirewallOpener = t; }
inline void pinged(uint64_t t) throw() { _lastPing = t; }
/**
* @param now Current time
* @return True if this path is fixed or has received data in last ACTIVITY_TIMEOUT ms
*/
inline bool active(uint64_t now) const
throw()
{
return ((_addr)&&((_fixed)||((now - _lastReceived) < ZT_PEER_PATH_ACTIVITY_TIMEOUT)));
}
/**
* @return Human-readable address and other information about this path, some computed as of current time
*/
inline std::string toString() const
{
uint64_t now = Utils::now();
char tmp[1024];
const char *t = "";
switch(_type) {
case PATH_TYPE_NULL: t = "null"; break;
case PATH_TYPE_UDP: t = "udp"; break;
case PATH_TYPE_TCP_OUT: t = "tcp_out"; break;
case PATH_TYPE_TCP_IN: t = "tcp_in"; break;
}
Utils::snprintf(tmp,sizeof(tmp),"%s;%s;%lld;%lld;%lld;%lld;%s",
t,
_addr.toString().c_str(),
(long long)((_lastSend != 0) ? (now - _lastSend) : -1),
(long long)((_lastReceived != 0) ? (now - _lastReceived) : -1),
(long long)((_lastFirewallOpener != 0) ? (now - _lastFirewallOpener) : -1),
(long long)((_lastPing != 0) ? (now - _lastPing) : -1),
((_fixed) ? "fixed" : (active(now) ? "active" : "inactive"))
);
return std::string(tmp);
}
inline bool operator==(const Path &p) const throw() { return ((_addr == p._addr)&&(_type == p._type)); }
inline bool operator!=(const Path &p) const throw() { return ((_addr != p._addr)||(_type != p._type)); }
inline bool operator<(const Path &p) const
throw()
{
if (_addr == p._addr)
return ((int)_type < (int)p._type);
else return (_addr < p._addr);
}
inline bool operator>(const Path &p) const throw() { return (p < *this); }
inline bool operator<=(const Path &p) const throw() { return !(p < *this); }
inline bool operator>=(const Path &p) const throw() { return !(*this < p); }
template<unsigned int C>
inline void serialize(Buffer<C> &b) const
{
b.append((unsigned char)ZT_PATH_SERIALIZATION_VERSION);
b.append(_lastSend);
b.append(_lastReceived);
b.append(_lastFirewallOpener);
b.append(_lastPing);
b.append((unsigned char)_addr.type());
switch(_addr.type()) {
case InetAddress::TYPE_NULL:
break;
case InetAddress::TYPE_IPV4:
b.append(_addr.rawIpData(),4);
b.append((uint16_t)_addr.port());
break;
case InetAddress::TYPE_IPV6:
b.append(_addr.rawIpData(),16);
b.append((uint16_t)_addr.port());
break;
}
b.append((unsigned char)_type);
b.append(_fixed ? (unsigned char)1 : (unsigned char)0);
}
template<unsigned int C>
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
{
unsigned int p = startAt;
if (b[p++] != ZT_PATH_SERIALIZATION_VERSION)
throw std::invalid_argument("Path: deserialize(): version mismatch");
_lastSend = b.template at<uint64_t>(p); p += sizeof(uint64_t);
_lastReceived = b.template at<uint64_t>(p); p += sizeof(uint64_t);
_lastFirewallOpener = b.template at<uint64_t>(p); p += sizeof(uint64_t);
_lastPing = b.template at<uint64_t>(p); p += sizeof(uint64_t);
switch((InetAddress::AddressType)b[p++]) {
case InetAddress::TYPE_IPV4:
_addr.set(b.field(p,4),4,b.template at<uint16_t>(p + 4));
p += 4 + sizeof(uint16_t);
break;
case InetAddress::TYPE_IPV6:
_addr.set(b.field(p,16),16,b.template at<uint16_t>(p + 16));
p += 16 + sizeof(uint16_t);
break;
default:
_addr.zero();
break;
}
_type = (Type)b[p++];
_fixed = (b[p++] != 0);
return (p - startAt);
}
private:
volatile uint64_t _lastSend;
volatile uint64_t _lastReceived;
volatile uint64_t _lastFirewallOpener;
volatile uint64_t _lastPing;
InetAddress _addr;
Type _type;
bool _fixed;
};
} // namespace ZeroTier
#endif
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