diff options
Diffstat (limited to 'osdep')
| -rw-r--r-- | osdep/Binder.hpp | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/osdep/Binder.hpp b/osdep/Binder.hpp new file mode 100644 index 00000000..5546b9f1 --- /dev/null +++ b/osdep/Binder.hpp @@ -0,0 +1,223 @@ +/* + * ZeroTier One - Network Virtualization Everywhere + * Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/ + * + * 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/>. + */ + +#ifndef ZT_BINDER_HPP +#define ZT_BINDER_HPP + +#include "../node/Constants.hpp" + +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#ifdef __WINDOWS__ +#include <WinSock2.h> +#include <Windows.h> +#include <ShlObj.h> +#include <netioapi.h> +#include <iphlpapi.h> +#else +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/wait.h> +#include <unistd.h> +#include <ifaddrs.h> +#endif + +#include <string> +#include <vector> +#include <algorithm> +#include <utility> + +#include "../node/InetAddress.hpp" +#include "../node/Mutex.hpp" + +#include "Phy.hpp" + +namespace ZeroTier { + +/** + * Enumerates local devices and binds ports to all potential ZeroTier path endpoints + * + * This replaces binding to wildcard (0.0.0.0 and ::0) with explicit binding + * as part of the path to default gateway support. Under the hood it uses + * different queries on different OSes to enumerate devices, and also exposes + * device enumeration and endpoint IP data for use elsewhere. + * + * On OSes that do not support local port enumeration or where this is not + * meaningful, this degrades to binding to wildcard. + */ +template<typename PHY_HANDLER_TYPE> +class Binder +{ +private: + struct _Binding + { + PhySocket *udpSock; + PhySocket *tcpListenSock; + InetAddress address; + }; + +public: + /** + * @param phy Physical interface to use -- be sure not to delete phy before binder + * @param port Port to bind to on all interfaces (TCP and UDP) + */ + Binder(typename Phy<PHY_HANDLER_TYPE> &phy,unsigned int port) : + _phy(phy), + _port(port) + { + } + + /** + * Closes all bound ports -- but NOT accepted connections on those ports + */ + ~Binder() + { + } + + /** + * Scan local devices and addresses and rebind TCP and UDP + * + * This should be called after wake from sleep, on detected network device + * changes, on startup, or periodically (e.g. every 30-60s). + * + * @param ignoreInterfacesByName Ignore these interfaces by name + * @param ignoreInterfacesByNamePrefix Ignore these interfaces by name-prefix (starts-with, e.g. zt ignores zt*) + * @param ignoreInterfacesByAddress Ignore these interfaces by address + */ + void refresh(const std::vector<std::string> &ignoreInterfacesByName,const std::vector<std::string> &ignoreInterfacesByNamePrefix,const std::vector<InetAddress> &ignoreInterfacesByAddress) + { + std::vector<InetAddress> localIfAddrs; + std::vector<_Binding> newBindings; + const char *na,*nb; + std::vector<std::string>::const_iterator si; + std::vector<InetAddress>::const_iterator ii; + std::vector<_Binding>::const_iterator bi; + PhySocket *udps,*tcps; + InetAddress ip; + Mutex::Lock _l(_lock); + +#ifdef __WINDOWS__ + +#else // not __WINDOWS__ + + struct ifaddrs *ifatbl = (struct ifaddrs *)0; + struct ifaddrs *ifa; + + if ((getifaddrs(&ifatbl) == 0)&&(ifatbl)) { + ifa = ifatbl; + while (ifa) { + if ((ifa->ifa_name)&&(ifa->ifa_addr)) { + for(si=ignoreInterfacesByName.begin();si!=ignoreInterfacesByName.end();++si) { + if (*si == ifa->ifa_name) + goto binder_hpp_ignore_interface; + } + + for(si=ignoreInterfacesByNamePrefix.begin();si!=ignoreInterfacesByNamePrefix.end();++si) { + na = si->c_str(); + nb = ifa->ifa_name; + while (*nb) { + if (*(na++) != *(nb++)) + goto binder_hpp_interface_prefixes_dont_match; + } + goto binder_hpp_ignore_interface; + } + +binder_hpp_interface_prefixes_dont_match: + ip = *(ifa->ifa_addr); + switch(ip.ipScope()) { + default: break; + case InetAddress::IP_SCOPE_PSEUDOPRIVATE: + case InetAddress::IP_SCOPE_GLOBAL: + case InetAddress::IP_SCOPE_LINK_LOCAL: + case InetAddress::IP_SCOPE_SHARED: + case InetAddress::IP_SCOPE_PRIVATE: + for(ii=ignoreInterfacesByAddress.begin();ii!=ignoreInterfacesByAddress.end();++ii) { + if (ip.ipsEqual(*ii)) + goto binder_hpp_ignore_interface; + } + + ip.setPort(_port); + localIfAddrs.push(ip); + + break; + } + } + +binder_hpp_ignore_interface: + ifa = ifa->ifa_next; + } + } + + freeifaddrs(ifatbl); + +#endif + + if (localIfAddrs.size() == 0) { + localIfAddrs.push_back(InetAddress((uint32_t)0,_port)); + localIfAddrs.push_back(InetAddress((const void *)"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",16,_port)); + } else { + std::sort(localIfAddrs.begin(),localIfAddrs.end()); + } + + for(bi=_bindings.begin();bi!=_bindings.end();++bi) { + if (std::find(localIfAddrs.begin(),localIfAddrs.end(),bi->address) == localIfAddrs.end()) { + _phy.close(bi->udpSock,false); + _phy.close(bi->tcpListenSock,false); + } + } + + for(ii=localIfAddrs.begin();ii!=localIfAddrs.end();++ii) { + for(bi=_bindings.begin();bi!=_bindings.end();++bi) { + if (bi->address == *ii) { + newBindings.push_back(*bi); + break; + } + } + + if (bi == _bindings.end()) { + udps = _phy.udpBind(reinterpret_cast<const struct sockaddr *>(&ii),(void *)0,131072); + if (udps) { + tcps = _phy.tcpListen(reinterpret_cast<const struct sockaddr *>(&ii),(void *)0); + if (tcps) { + newBindings.push_back(_Binding()); + newBindings.back().udpSock = udps; + newBindings.back().tcpListenSock = tcps; + newBindings.back().address = *ii; + } else { + _phy.close(udps,false); + } + } + } + } + + _bindings.swap(newBindings); + } + +private: + std::vector<_Binding> _bindings; + typename Phy<PHY_HANDLER_TYPE> &_phy; + unsigned int _port; + Mutex _lock; +}; + +} // namespace ZeroTier + +#endif |