252 lines
6.6 KiB
C++
252 lines
6.6 KiB
C++
/*
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* ZeroTier SDK - Network Virtualization Everywhere
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* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* You can be released from the requirements of the license by purchasing
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* a commercial license. Buying such a license is mandatory as soon as you
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* develop commercial closed-source software that incorporates or links
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* directly against ZeroTier software without disclosing the source code
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* of your own application.
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*/
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/**
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* @file
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*
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* Virtual Ethernet tap device
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*/
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#ifndef LIBZT_VIRTUALTAP_HPP
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#define LIBZT_VIRTUALTAP_HPP
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#ifndef _MSC_VER
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extern int errno;
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#endif
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#include "Phy.hpp"
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#include "Thread.hpp"
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#include "InetAddress.hpp"
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#include "MulticastGroup.hpp"
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#include "Mutex.hpp"
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#include "Options.h"
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#if defined(_WIN32)
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#include <WinSock2.h>
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#include <Windows.h>
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#include <IPHlpApi.h>
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#include <Ifdef.h>
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#endif
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namespace ZeroTier {
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class Mutex;
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/**
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* A virtual tap device. The ZeroTier core service creates one of these for each
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* virtual network joined. It will be destroyed upon leave().
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*/
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class VirtualTap
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{
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friend class Phy<VirtualTap *>;
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public:
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VirtualTap(
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const char *homePath,
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const MAC &mac,
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unsigned int mtu,
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unsigned int metric,
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uint64_t nwid,
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const char *friendlyName,
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void (*handler)(void *, void *, uint64_t, const MAC &,
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const MAC &, unsigned int, unsigned int, const void *, unsigned int),
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void *arg);
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~VirtualTap();
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void setEnabled(bool en);
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bool enabled() const;
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/**
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* Mutex for protecting IP address container for this tap.
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*/
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Mutex _ips_m; // Public because we want it accessible by the driver layer
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/**
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* Return whether this tap has been assigned an IPv4 address.
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*/
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bool hasIpv4Addr();
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/**
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* Return whether this tap has been assigned an IPv6 address.
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*/
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bool hasIpv6Addr();
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/**
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* Adds an address to the userspace stack interface associated with this VirtualTap
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* - Starts VirtualTap main thread ONLY if successful
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*/
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bool addIp(const InetAddress &ip);
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/**
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* Removes an address from the userspace stack interface associated with this VirtualTap
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*/
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bool removeIp(const InetAddress &ip);
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/**
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* Presents data to the userspace stack
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*/
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void put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,
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unsigned int len);
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/**
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* Get VirtualTap device name (e.g. 'libzt17d72843bc2c5760')
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*/
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std::string deviceName() const;
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/**
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* Get Node ID (ZT address)
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*/
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std::string nodeId() const;
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/**
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* Set friendly name
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*/
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void setFriendlyName(const char *friendlyName);
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/**
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* Scan multicast groups
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*/
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void scanMulticastGroups(std::vector<MulticastGroup> &added,
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std::vector<MulticastGroup> &removed);
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/**
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* Set MTU
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*/
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void setMtu(unsigned int mtu);
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/**
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* Calls main network stack loops
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*/
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void threadMain()
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throw();
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#if defined(__MINGW32__)
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/* The following is merely to make ZeroTier's OneService happy while building on Windows.
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we won't use these in libzt */
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NET_LUID _deviceLuid;
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std::string _deviceInstanceId;
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/**
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* Returns whether the VirtualTap interface has been initialized
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*/
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bool isInitialized() const { return _initialized; };
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inline const NET_LUID &luid() const { return _deviceLuid; }
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inline const std::string &instanceId() const { return _deviceInstanceId; }
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#endif
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/**
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* For moving data onto the ZeroTier virtual wire
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*/
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void (*_handler)(void *, void *, uint64_t, const MAC &, const MAC &, unsigned int, unsigned int,
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const void *, unsigned int);
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void phyOnUnixClose(PhySocket *sock, void **uptr);
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void phyOnUnixData(PhySocket *sock, void **uptr, void *data, ssize_t len);
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void phyOnUnixWritable(PhySocket *sock, void **uptr, bool stack_invoked);
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//////////////////////////////////////////////////////////////////////////////
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// Lower-level lwIP netif handling and traffic handling readiness //
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//////////////////////////////////////////////////////////////////////////////
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void *netif = NULL;
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/**
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* The last time that this virtual tap received a network config update from the core
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*/
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uint64_t _lastConfigUpdateTime = 0;
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/**
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* The last time that a callback notification was sent to the user application signalling
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* that this interface is ready to process traffic.
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*/
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uint64_t _lastReadyReportTime = 0;
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void lastConfigUpdate(uint64_t lastConfigUpdateTime);
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int _networkStatus = 0;
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//////////////////////////////////////////////////////////////////////////////
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// Vars //
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//////////////////////////////////////////////////////////////////////////////
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std::vector<std::pair<InetAddress, InetAddress> > routes;
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char vtap_full_name[64];
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std::vector<InetAddress> ips() const;
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std::vector<InetAddress> _ips;
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std::string _homePath;
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void *_arg;
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volatile bool _initialized;
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volatile bool _enabled;
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volatile bool _run;
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MAC _mac;
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unsigned int _mtu;
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uint64_t _nwid;
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PhySocket *_unixListenSocket;
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Phy<VirtualTap *> _phy;
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Thread _thread;
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int _shutdownSignalPipe[2];
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std::string _dev; // path to Unix domain socket
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std::vector<MulticastGroup> _multicastGroups;
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Mutex _multicastGroups_m;
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/*
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* Timestamp of last run of housekeeping
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* SEE: ZT_HOUSEKEEPING_INTERVAL in ZeroTier.h
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*/
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uint64_t last_housekeeping_ts = 0;
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/**
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* Performs miscellaneous background tasks
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*/
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void Housekeeping();
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//////////////////////////////////////////////////////////////////////////////
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// Not used in this implementation //
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//////////////////////////////////////////////////////////////////////////////
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void phyOnDatagram(PhySocket *sock,void **uptr,const struct sockaddr *local_address,
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const struct sockaddr *from,void *data,unsigned long len);
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void phyOnTcpConnect(PhySocket *sock,void **uptr,bool success);
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void phyOnTcpAccept(PhySocket *sockL,PhySocket *sockN,void **uptrL,void **uptrN,
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const struct sockaddr *from);
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void phyOnTcpClose(PhySocket *sock,void **uptr);
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void phyOnTcpData(PhySocket *sock,void **uptr,void *data,unsigned long len);
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void phyOnTcpWritable(PhySocket *sock,void **uptr);
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};
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} // namespace ZeroTier
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#endif // _H
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