337 lines
9.2 KiB
C++
337 lines
9.2 KiB
C++
/*
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* ZeroTier SDK - Network Virtualization Everywhere
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* Copyright (C) 2011-2017 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 ZT_VIRTUALTAP_HPP
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#define ZT_VIRTUALTAP_HPP
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extern int errno;
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#include "Mutex.hpp"
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#include "MulticastGroup.hpp"
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#include "InetAddress.hpp"
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#include "Thread.hpp"
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#include "Phy.hpp"
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#include "libztDefs.h"
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#include <vector>
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extern std::vector<void*> vtaps;
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extern ZeroTier::Mutex _vtaps_lock;
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#if defined(__MINGW32__) || defined(__MINGW64__)
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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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using namespace ZeroTier;
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class VirtualSocket;
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/**
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* emulates an Ethernet tap device
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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 ZeroTier::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 ZeroTier::MAC &,
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const ZeroTier::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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* Registers a device with the given address
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*/
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bool registerIpWithStack(const ZeroTier::InetAddress &ip);
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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 ZeroTier::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 ZeroTier::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 ZeroTier::MAC &from,const ZeroTier::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. 'libzt4-17d72843bc2c5760')
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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<ZeroTier::MulticastGroup> &added,
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std::vector<ZeroTier::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 ZeroTier::MAC &, const ZeroTier::MAC &, unsigned int, unsigned int,
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const void *, unsigned int);
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/**
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* Signals us to close the TcpVirtualSocket associated with this PhySocket
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*/
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void phyOnUnixClose(ZeroTier::PhySocket *sock, void **uptr);
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/**
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* Notifies us that there is data to be read from an application's socket
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*/
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void phyOnUnixData(ZeroTier::PhySocket *sock, void **uptr, void *data, ssize_t len);
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/**
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* Notifies us that we can write to an application's socket
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*/
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void phyOnUnixWritable(ZeroTier::PhySocket *sock, void **uptr, bool stack_invoked);
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/**
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* Adds a route to the virtual tap
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*/
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bool routeAdd(const ZeroTier::InetAddress &ip, const ZeroTier::InetAddress &nm, const ZeroTier::InetAddress &gw);
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/**
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* Deletes a route from the virtual tap
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*/
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bool routeDelete(const ZeroTier::InetAddress &ip, const ZeroTier::InetAddress &nm);
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/**
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* Assign a VirtualSocket to the VirtualTap
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*/
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void addVirtualSocket(VirtualSocket *vs);
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/**
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* Remove a VirtualSocket from the VirtualTap
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*/
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void removeVirtualSocket();
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/****************************************************************************/
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/* DNS */
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/****************************************************************************/
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/**
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* Registers a DNS nameserver with the network stack
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*/
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int add_DNS_Nameserver(struct sockaddr *addr);
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/**
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* Un-registers a DNS nameserver from the network stack
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*/
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int del_DNS_Nameserver(struct sockaddr *addr);
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/****************************************************************************/
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/* Vars */
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/****************************************************************************/
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#if defined(STACK_PICO)
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bool should_start_stack = false;
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struct pico_device *picodev = NULL;
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/****************************************************************************/
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/* Guarded RX Frame Buffer for picoTCP */
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/****************************************************************************/
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unsigned char pico_frame_rxbuf[MAX_PICO_FRAME_RX_BUF_SZ];
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int pico_frame_rxbuf_tot = 0;
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Mutex _pico_frame_rxbuf_m;
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#endif
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std::vector<std::pair<ZeroTier::InetAddress, ZeroTier::InetAddress> > routes;
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void *zt1ServiceRef = NULL;
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char vtap_full_name[64];
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char vtap_abbr_name[16];
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static int devno;
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size_t ifindex = 0;
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std::vector<ZeroTier::InetAddress> ips() const;
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std::vector<ZeroTier::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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ZeroTier::MAC _mac;
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unsigned int _mtu;
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uint64_t _nwid;
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ZeroTier::PhySocket *_unixListenSocket;
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ZeroTier::Phy<VirtualTap *> _phy;
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std::vector<VirtualSocket*> _VirtualSockets;
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Thread _thread;
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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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Mutex _ips_m, _tcpconns_m, _rx_buf_m, _close_m;
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/*
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* Timestamp of last run of housekeeping
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* SEE: ZT_HOUSEKEEPING_INTERVAL in libzt.h
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*/
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uint64_t last_housekeeping_ts = 0;
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/****************************************************************************/
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/* In these, we will call the stack's corresponding functions, this is */
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/* where one would put logic to select between different stacks */
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/****************************************************************************/
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/**
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* Connect to a remote host via the userspace stack interface associated with this VirtualTap
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*/
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int Connect(VirtualSocket *vs, const struct sockaddr *addr, socklen_t addrlen);
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/**
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* Bind to the userspace stack interface associated with this VirtualTap
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*/
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int Bind(VirtualSocket *vs, const struct sockaddr *addr, socklen_t addrlen);
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/**
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* Listen for a VirtualSocket
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*/
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int Listen(VirtualSocket *vs, int backlog);
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/**
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* Accepts an incoming VirtualSocket
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*/
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VirtualSocket* Accept(VirtualSocket *vs);
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/**
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* Move data from RX buffer to application's "socket"
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*/
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int Read(VirtualSocket *vs, PhySocket *sock, void **uptr, bool stack_invoked);
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/**
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* Move data from application's "socket" into network stack
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*/
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int Write(VirtualSocket *vs, void *data, ssize_t len);
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/**
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* Send data to specified host
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*/
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int SendTo(VirtualSocket *vs, const void *buf, size_t len, int flags, const struct sockaddr *addr, socklen_t addrlen);
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/**
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* Closes a VirtualSocket
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*/
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int Close(VirtualSocket *vs);
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/**
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* Shuts down some aspect of a VirtualSocket
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*/
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int Shutdown(VirtualSocket *vs, int how);
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/**
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* Disposes of previously-closed VirtualSockets
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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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#endif // _H
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