mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-29 17:28:52 +00:00
261 lines
6.9 KiB
C++
261 lines
6.9 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 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 "Condition.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 identify persistent taps at the OS layer (e.g. nwid in hex)
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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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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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