Adam Ierymenko
12 years ago
6 changed files with 1422 additions and 116 deletions
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/*
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* ZeroTier One - Global Peer to Peer Ethernet |
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* Copyright (C) 2011-2014 ZeroTier Networks LLC |
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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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* ZeroTier may be used and distributed under the terms of the GPLv3, which |
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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* |
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* If you would like to embed ZeroTier into a commercial application or |
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* redistribute it in a modified binary form, please contact ZeroTier Networks |
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* LLC. Start here: http://www.zerotier.com/
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*/ |
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#ifndef ZT_UNIXETHERNETTAP_HPP |
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#define ZT_UNIXETHERNETTAP_HPP |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdexcept> |
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#include "EthernetTap.hpp" |
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#include "Mutex.hpp" |
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#include "Thread.hpp" |
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namespace ZeroTier { |
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class RuntimeEnvironment; |
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/**
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* Tap device using Unix taps (contains special case code for Linux, OSX, etc. but they're all similar) |
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*/ |
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class UnixEthernetTap : public EthernetTap |
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{ |
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public: |
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/**
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* Construct a new TAP device |
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* |
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* Handler arguments: arg,from,to,etherType,data |
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*
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* @param renv Runtime environment |
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* @param tryToGetDevice Unix device name (e.g. zt0) |
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* @param mac MAC address of device |
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* @param mtu MTU of device |
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* @param desc If non-NULL, a description (not used on all OSes) |
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* @param handler Handler function to be called when data is received from the tap |
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* @param arg First argument to handler function |
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* @throws std::runtime_error Unable to allocate tap device |
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*/ |
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UnixEthernetTap( |
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const RuntimeEnvironment *renv, |
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const char *tryToGetDevice, |
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const MAC &mac, |
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unsigned int mtu, |
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void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &), |
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void *arg) |
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throw(std::runtime_error); |
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virtual ~UnixEthernetTap(); |
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virtual void setEnabled(bool en); |
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virtual bool enabled() const; |
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virtual void setDisplayName(const char *dn); |
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virtual bool addIP(const InetAddress &ip); |
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virtual bool removeIP(const InetAddress &ip); |
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virtual std::set<InetAddress> ips() const; |
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virtual void put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len); |
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virtual std::string deviceName() const; |
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virtual std::string persistentId() const; |
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virtual bool updateMulticastGroups(std::set<MulticastGroup> &groups); |
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/**
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* Thread main method; do not call elsewhere |
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*/ |
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void threadMain() |
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throw(); |
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private: |
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const RuntimeEnvironment *_r; |
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void (*_handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &); |
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void *_arg; |
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Thread _thread; |
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std::string _dev; |
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int _fd; |
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int _shutdownSignalPipe[2]; |
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volatile bool _enabled; |
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}; |
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} // namespace ZeroTier
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#endif |
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@ -0,0 +1,273 @@
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/*
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* ZeroTier One - Global Peer to Peer Ethernet |
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* Copyright (C) 2011-2014 ZeroTier Networks LLC |
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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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* ZeroTier may be used and distributed under the terms of the GPLv3, which |
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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* |
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* If you would like to embed ZeroTier into a commercial application or |
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* redistribute it in a modified binary form, please contact ZeroTier Networks |
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* LLC. Start here: http://www.zerotier.com/
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*/ |
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#ifndef ZT_ETHERNETTAP_HPP |
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#define ZT_ETHERNETTAP_HPP |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <map> |
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#include <list> |
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#include <vector> |
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#include <set> |
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#include <string> |
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#include <queue> |
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#include <stdexcept> |
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#include "Constants.hpp" |
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#include "InetAddress.hpp" |
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#include "MAC.hpp" |
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#include "Mutex.hpp" |
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#include "MulticastGroup.hpp" |
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#include "Thread.hpp" |
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#include "Buffer.hpp" |
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#include "Array.hpp" |
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#ifdef __WINDOWS__ |
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#include <WinSock2.h> |
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#include <Windows.h> |
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#endif |
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namespace ZeroTier { |
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class RuntimeEnvironment; |
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/**
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* System ethernet tap device |
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*/ |
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class EthernetTap |
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{ |
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public: |
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/**
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* Construct a new TAP device |
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* |
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* Handler arguments: arg,from,to,etherType,data |
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*
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* @param renv Runtime environment |
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* @param tag A tag used to persist tap identity at the OS layer (e.g. nwid in hex for Windows or device name for *nix) |
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* @param mac MAC address of device |
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* @param mtu MTU of device |
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* @param desc If non-NULL, a description (not used on all OSes) |
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* @param handler Handler function to be called when data is received from the tap |
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* @param arg First argument to handler function |
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* @throws std::runtime_error Unable to allocate device |
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*/ |
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EthernetTap( |
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const RuntimeEnvironment *renv, |
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const char *tag, |
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const MAC &mac, |
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unsigned int mtu, |
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void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &), |
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void *arg) |
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throw(std::runtime_error); |
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/**
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* Close tap and shut down thread |
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* |
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* This may block for a few seconds while thread exits. |
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*/ |
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~EthernetTap(); |
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/**
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* Set the user display name for this connection |
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* |
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* This does nothing on platforms that don't have this concept. |
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* |
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* @param dn User display name |
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*/ |
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void setDisplayName(const char *dn); |
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/**
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* @return MAC address of this interface |
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*/ |
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inline const MAC &mac() const throw() { return _mac; } |
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/**
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* @return MTU of this interface |
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*/ |
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inline unsigned int mtu() const throw() { return _mtu; } |
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/**
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* Add an IP to this interface |
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* |
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* @param ip IP and netmask (netmask stored in port field) |
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* @return True if IP added successfully |
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*/ |
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bool addIP(const InetAddress &ip); |
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/**
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* Remove an IP from this interface |
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* |
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* Link-local IP addresses may not be able to be removed, depending on platform and type. |
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* |
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* @param ip IP and netmask (netmask stored in port field) |
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* @return True if IP removed successfully |
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*/ |
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bool removeIP(const InetAddress &ip); |
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/**
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* @return All IP addresses (V4 and V6) assigned to this interface (including link-local) |
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*/ |
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std::set<InetAddress> ips() const; |
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/**
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* Set this tap's IP addresses to exactly this set of IPs |
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* |
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* New IPs are created, ones not in this list are removed. |
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* |
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* @param ips IP addresses with netmask in port field |
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*/ |
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inline void setIps(const std::set<InetAddress> &allIps) |
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{ |
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for(std::set<InetAddress>::iterator i(allIps.begin());i!=allIps.end();++i) |
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addIP(*i); |
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std::set<InetAddress> myIps(ips()); |
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#ifdef __APPLE__ |
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bool haveV6LinkLocal = false; |
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for(std::set<InetAddress>::iterator i(myIps.begin());i!=myIps.end();++i) { |
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if (i->isLinkLocal()) { |
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if (i->isV6()) |
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haveV6LinkLocal = true; |
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} else if (!allIps.count(*i)) |
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removeIP(*i); |
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} |
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if (!haveV6LinkLocal) |
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addIP(InetAddress::makeIpv6LinkLocal(_mac)); |
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#else |
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for(std::set<InetAddress>::iterator i(myIps.begin());i!=myIps.end();++i) { |
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if ((!i->isLinkLocal())&&(!allIps.count(*i))) |
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removeIP(*i); |
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} |
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#endif |
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} |
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/**
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* Put a frame, making it available to the OS for processing |
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* |
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* @param from MAC address from which frame originated |
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* @param to MAC address of destination (typically MAC of tap itself) |
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* @param etherType Ethernet protocol ID |
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* @param data Frame payload |
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* @param len Length of frame |
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*/ |
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void put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len); |
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/**
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* @return OS-specific device or connection name |
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*/ |
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std::string deviceName() const; |
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/**
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* @return OS-internal persistent device ID or empty string if not applicable to this platform or not persistent |
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*/ |
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std::string persistentId() const; |
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/**
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* Fill or modify a set to contain multicast groups for this device |
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* |
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* This populates a set or, if already populated, modifies it to contain |
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* only multicast groups in which this device is interested. |
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* |
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* This should always include the blind wildcard MulticastGroup (MAC of |
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* ff:ff:ff:ff:ff:ff and 0 ADI field). |
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* |
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* @param groups Set to modify in place |
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* @return True if set was changed since last call |
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*/ |
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bool updateMulticastGroups(std::set<MulticastGroup> &groups); |
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/**
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* Thread main method; do not call elsewhere |
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*/ |
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void threadMain() |
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throw(); |
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/**
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* Remove persistent tap device by device name |
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* |
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* This has no effect on platforms that do not have persistent taps. |
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* On platforms like Windows with persistent devices the device is |
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* uninstalled. |
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* |
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* @param _r Runtime environment |
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* @param pdev Device name as returned by persistentId() while tap is running |
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* @return True if a device was deleted |
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*/ |
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static bool deletePersistentTapDevice(const RuntimeEnvironment *_r,const char *pid); |
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/**
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* Clean persistent tap devices that are not in the supplied set |
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* |
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* This has no effect on platforms that do not have persistent taps. |
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* On platforms like Windows with persistent devices the device is |
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* uninstalled. |
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* |
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* @param _r Runtime environment |
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* @param exceptThese Devices to leave in place |
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* @param alsoRemoveUnassociatedDevices If true, remove devices not associated with any network as well |
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* @return Number of devices deleted or -1 if an error prevented the operation from being performed |
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*/ |
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static int cleanPersistentTapDevices(const RuntimeEnvironment *_r,const std::set<std::string> &exceptThese,bool alsoRemoveUnassociatedDevices); |
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private: |
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const MAC _mac; |
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const unsigned int _mtu; |
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const RuntimeEnvironment *_r; |
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void (*_handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &); |
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void *_arg; |
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Thread _thread; |
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#ifdef __UNIX_LIKE__ |
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char _dev[16]; |
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int _fd; |
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int _shutdownSignalPipe[2]; |
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#endif |
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#ifdef __WINDOWS__ |
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void _syncIpsWithRegistry(const std::set<InetAddress> &haveIps); |
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HANDLE _tap; |
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OVERLAPPED _tapOvlRead,_tapOvlWrite; |
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char _tapReadBuf[ZT_IF_MTU + 32]; |
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HANDLE _injectSemaphore; |
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GUID _deviceGuid; |
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std::string _myDeviceInstanceId; // NetCfgInstanceId, a GUID
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std::string _myDeviceInstanceIdPath; // DeviceInstanceID, another kind of "instance ID"
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std::queue< std::pair< Array<char,ZT_IF_MTU + 32>,unsigned int > > _injectPending; |
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Mutex _injectPending_m; |
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volatile bool _run; |
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volatile bool _initialized; |
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#endif |
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}; |
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} // namespace ZeroTier
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#endif |
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