1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* 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/
*/
#ifndef ZT_PATH_HPP
#define ZT_PATH_HPP
#include <stdint.h>
#include <string.h>
#include <stdexcept>
#include <string>
#include <algorithm>
#include "Constants.hpp"
#include "Node.hpp"
#include "InetAddress.hpp"
#include "Utils.hpp"
#include "AntiRecursion.hpp"
#include "RuntimeEnvironment.hpp"
namespace ZeroTier {
/**
* WAN address and protocol for reaching a peer
*
* This structure is volatile and memcpy-able, and depends on
* InetAddress being similarly safe.
*/
class Path
{
public:
Path() :
_addr(),
_lastSend(0),
_lastReceived(0),
_lastReceiveDesperation(0),
_fixed(false) {}
Path(const Path &p) throw() { memcpy(this,&p,sizeof(Path)); }
Path(const InetAddress &addr,bool fixed) :
_addr(addr),
_lastSend(0),
_lastReceived(0),
_lastReceiveDesperation(0),
_fixed(fixed) {}
inline void init(const InetAddress &addr,bool fixed)
{
_addr = addr;
_lastSend = 0;
_lastReceived = 0;
_lastReceiveDesperation = 0;
_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 uint64_t lastSend() const throw() { return _lastSend; }
inline uint64_t lastReceived() const throw() { return _lastReceived; }
/**
* Called when a packet is sent to this path
*
* This is called automatically by Path::send().
*
* @param t Time of send
*/
inline void sent(uint64_t t)
throw()
{
_lastSend = t;
}
/**
* Called when a packet is received from this path
*
* @param t Time of receive
* @param d Link desperation of receive
*/
inline void received(uint64_t t,unsigned int d)
throw()
{
_lastReceived = t;
_lastReceiveDesperation = d;
}
/**
* @return Is this a fixed path?
*/
inline bool fixed() const throw() { return _fixed; }
/**
* @param f New value of fixed path flag
*/
inline void setFixed(bool f) throw() { _fixed = f; }
/**
* @return Last desperation reported via incoming link
*/
inline unsigned int lastReceiveDesperation() const throw() { return _lastReceiveDesperation; }
/**
* @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 ( (_fixed) || ((now - _lastReceived) < ZT_PEER_ACTIVITY_TIMEOUT) );
}
/**
* Send a packet via this path
*
* @param RR Runtime environment
* @param data Packet data
* @param len Packet length
* @param now Current time
* @return True if transport reported success
*/
inline bool send(const RuntimeEnvironment *RR,const void *data,unsigned int len,uint64_t now)
{
if (RR->node->putPacket(_addr,data,len,std::max(RR->node->coreDesperation(),_lastReceiveDesperation))) {
sent(now);
RR->antiRec->logOutgoingZT(data,len);
return true;
}
return false;
}
/**
* @param now Current time
* @return Human-readable address and other information about this path
*/
inline std::string toString(uint64_t now) const
{
char tmp[1024];
Utils::snprintf(tmp,sizeof(tmp),"%s(%s)",
_addr.toString().c_str(),
((_fixed) ? "fixed" : (active(now) ? "active" : "inactive"))
);
return std::string(tmp);
}
inline operator bool() const throw() { return (_addr); }
inline bool operator==(const Path &p) const throw() { return (_addr == p._addr); }
inline bool operator!=(const Path &p) const throw() { return (_addr != p._addr); }
inline bool operator<(const Path &p) const throw() { return (_addr < p._addr); }
inline bool operator>(const Path &p) const throw() { return (_addr > p._addr); }
inline bool operator<=(const Path &p) const throw() { return (_addr <= p._addr); }
inline bool operator>=(const Path &p) const throw() { return (_addr >= p._addr); }
private:
InetAddress _addr;
uint64_t _lastSend;
uint64_t _lastReceived;
unsigned int _lastReceiveDesperation;
bool _fixed;
};
} // namespace ZeroTier
#endif
|
