mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 23:02:23 +00:00
905 lines
24 KiB
C++
905 lines
24 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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#include <string>
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#include <map>
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#include <set>
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#include <algorithm>
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#include "Constants.hpp"
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#include "EthernetTap.hpp"
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#include "Logger.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Utils.hpp"
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#include "Mutex.hpp"
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// ff:ff:ff:ff:ff:ff with no ADI
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static const ZeroTier::MulticastGroup _blindWildcardMulticastGroup(ZeroTier::MAC(0xff),0);
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//
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// TAP implementation for *nix OSes, with some specialization for different flavors
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//
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#ifdef __UNIX_LIKE__ /////////////////////////////////////////////////////////
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <sys/select.h>
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#include <netinet/in.h>
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#include <net/if_arp.h>
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#include <arpa/inet.h>
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// Command identifiers used with command finder static (on various *nixes)
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#define ZT_UNIX_IP_COMMAND 1
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#define ZT_UNIX_IFCONFIG_COMMAND 2
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#define ZT_MAC_KEXTLOAD_COMMAND 3
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#define ZT_MAC_IPCONFIG_COMMAND 4
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// Finds external commands on startup
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class _CommandFinder
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{
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public:
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_CommandFinder()
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{
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_findCmd(ZT_UNIX_IFCONFIG_COMMAND,"ifconfig");
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#ifdef __LINUX__
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_findCmd(ZT_UNIX_IP_COMMAND,"ip");
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#endif
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#ifdef __APPLE__
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_findCmd(ZT_MAC_KEXTLOAD_COMMAND,"kextload");
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_findCmd(ZT_MAC_IPCONFIG_COMMAND,"ipconfig");
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#endif
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}
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// returns NULL if command was not found
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inline const char *operator[](int id) const
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throw()
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{
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std::map<int,std::string>::const_iterator c(_paths.find(id));
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if (c == _paths.end())
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return (const char *)0;
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return c->second.c_str();
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}
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private:
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inline void _findCmd(int id,const char *name)
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{
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char tmp[4096];
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sprintf(tmp,"/sbin/%s",name);
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if (ZeroTier::Utils::fileExists(tmp)) {
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_paths[id] = tmp;
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return;
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}
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sprintf(tmp,"/usr/sbin/%s",name);
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if (ZeroTier::Utils::fileExists(tmp)) {
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_paths[id] = tmp;
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return;
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}
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sprintf(tmp,"/bin/%s",name);
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if (ZeroTier::Utils::fileExists(tmp)) {
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_paths[id] = tmp;
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return;
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}
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sprintf(tmp,"/usr/bin/%s",name);
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if (ZeroTier::Utils::fileExists(tmp)) {
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_paths[id] = tmp;
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return;
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}
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}
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std::map<int,std::string> _paths;
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};
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static const _CommandFinder UNIX_COMMANDS;
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#ifdef __LINUX__
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <linux/if_addr.h>
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#include <linux/if_ether.h>
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#endif // __LINUX__
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#ifdef __APPLE__
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#include <sys/uio.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <ifaddrs.h>
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#endif // __APPLE__
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namespace ZeroTier {
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// Only permit one tap to be opened concurrently across the entire process
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static Mutex __tapCreateLock;
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#ifdef __LINUX__
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EthernetTap::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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_mac(mac),
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_mtu(mtu),
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_r(renv),
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_handler(handler),
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_arg(arg),
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_fd(0)
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{
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char procpath[128];
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Mutex::Lock _l(__tapCreateLock); // create only one tap at a time, globally
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if (mtu > 4096)
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throw std::runtime_error("max tap MTU is 4096");
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_fd = ::open("/dev/net/tun",O_RDWR);
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if (_fd <= 0)
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throw std::runtime_error(std::string("could not open TUN/TAP device: ") + strerror(errno));
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struct ifreq ifr;
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memset(&ifr,0,sizeof(ifr));
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{ // pick an unused device name
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int devno = 0;
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struct stat sbuf;
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do {
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sprintf(ifr.ifr_name,"zt%d",devno++);
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sprintf(procpath,"/proc/sys/net/ipv4/conf/%s",ifr.ifr_name);
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} while (stat(procpath,&sbuf) == 0);
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}
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (ioctl(_fd,TUNSETIFF,(void *)&ifr) < 0) {
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::close(_fd);
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throw std::runtime_error("unable to configure TUN/TAP device for TAP operation");
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}
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strcpy(_dev,ifr.ifr_name);
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ioctl(_fd,TUNSETPERSIST,0); // valgrind may generate a false alarm here
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// Open an arbitrary socket to talk to netlink
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int sock = socket(AF_INET,SOCK_DGRAM,0);
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if (sock <= 0) {
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::close(_fd);
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throw std::runtime_error("unable to open netlink socket");
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}
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// Set MAC address
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ifr.ifr_ifru.ifru_hwaddr.sa_family = ARPHRD_ETHER;
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memcpy(ifr.ifr_ifru.ifru_hwaddr.sa_data,mac.data,6);
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if (ioctl(sock,SIOCSIFHWADDR,(void *)&ifr) < 0) {
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::close(_fd);
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::close(sock);
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throw std::runtime_error("unable to configure TAP hardware (MAC) address");
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return;
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}
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// Set MTU
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ifr.ifr_ifru.ifru_mtu = (int)mtu;
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if (ioctl(sock,SIOCSIFMTU,(void *)&ifr) < 0) {
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::close(_fd);
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::close(sock);
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throw std::runtime_error("unable to configure TAP MTU");
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}
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if (fcntl(_fd,F_SETFL,fcntl(_fd,F_GETFL) & ~O_NONBLOCK) == -1) {
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::close(_fd);
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throw std::runtime_error("unable to set flags on file descriptor for TAP device");
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}
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/* Bring interface up */
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if (ioctl(sock,SIOCGIFFLAGS,(void *)&ifr) < 0) {
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::close(_fd);
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::close(sock);
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throw std::runtime_error("unable to get TAP interface flags");
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}
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ifr.ifr_flags |= IFF_UP;
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if (ioctl(sock,SIOCSIFFLAGS,(void *)&ifr) < 0) {
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::close(_fd);
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::close(sock);
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throw std::runtime_error("unable to set TAP interface flags");
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}
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::close(sock);
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::pipe(_shutdownSignalPipe);
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TRACE("tap %s created",_dev);
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_thread = Thread::start(this);
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}
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#endif // __LINUX__
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#ifdef __APPLE__
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EthernetTap::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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_mac(mac),
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_mtu(mtu),
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_r(renv),
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_handler(handler),
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_arg(arg),
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_fd(0)
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{
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char devpath[64],ethaddr[64],mtustr[16];
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struct stat tmp;
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Mutex::Lock _l(__tapCreateLock); // create only one tap at a time, globally
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if (mtu > 4096)
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throw std::runtime_error("max tap MTU is 4096");
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// Check for existence of ZT tap devices, try to load module if not there
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const char *kextload = UNIX_COMMANDS[ZT_MAC_KEXTLOAD_COMMAND];
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if ((stat("/dev/zt0",&tmp))&&(kextload)) {
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long kextpid;
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char tmp[4096];
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strcpy(tmp,_r->homePath.c_str());
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if ((kextpid = (long)vfork()) == 0) {
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chdir(tmp);
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execl(kextload,kextload,"-q","-repository",tmp,"tap.kext",(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(kextpid,&exitcode,0);
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usleep(500);
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}
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}
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if (stat("/dev/zt0",&tmp))
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throw std::runtime_error("/dev/zt# tap devices do not exist and unable to load kernel extension");
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// Open the first available device (ones in use will fail with resource busy)
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for(int i=0;i<256;++i) {
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sprintf(devpath,"/dev/zt%d",i);
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if (stat(devpath,&tmp))
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throw std::runtime_error("no more TAP devices available");
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_fd = ::open(devpath,O_RDWR);
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if (_fd > 0) {
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sprintf(_dev,"zt%d",i);
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break;
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}
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}
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if (_fd <= 0)
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throw std::runtime_error("unable to open TAP device or no more devices available");
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if (fcntl(_fd,F_SETFL,fcntl(_fd,F_GETFL) & ~O_NONBLOCK) == -1) {
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::close(_fd);
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throw std::runtime_error("unable to set flags on file descriptor for TAP device");
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}
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const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
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if (!ifconfig) {
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::close(_fd);
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throw std::runtime_error("unable to find 'ifconfig' command on system");
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}
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// Configure MAC address and MTU, bring interface up
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sprintf(ethaddr,"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",(int)mac[0],(int)mac[1],(int)mac[2],(int)mac[3],(int)mac[4],(int)mac[5]);
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sprintf(mtustr,"%u",mtu);
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long cpid;
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if ((cpid = (long)vfork()) == 0) {
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execl(ifconfig,ifconfig,_dev,"lladdr",ethaddr,"mtu",mtustr,"up",(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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if (exitcode) {
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::close(_fd);
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throw std::runtime_error("ifconfig failure setting link-layer address and activating tap interface");
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}
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}
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whack(); // turns on IPv6 on OSX
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::pipe(_shutdownSignalPipe);
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_thread = Thread::start(this);
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}
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#endif // __APPLE__
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EthernetTap::~EthernetTap()
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{
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::write(_shutdownSignalPipe[1],"\0",1); // causes thread to exit
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Thread::join(_thread);
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::close(_fd);
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}
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#ifdef __APPLE__
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void EthernetTap::whack()
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{
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const char *ipconfig = UNIX_COMMANDS[ZT_MAC_IPCONFIG_COMMAND];
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if (ipconfig) {
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long cpid = (long)vfork();
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if (cpid == 0) {
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execl(ipconfig,ipconfig,"set",_dev,"AUTOMATIC-V6",(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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}
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}
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}
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#else
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void EthernetTap::whack() {}
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#endif // __APPLE__ / !__APPLE__
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#ifdef __LINUX__
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static bool ___removeIp(const char *_dev,const InetAddress &ip)
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{
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const char *ipcmd = UNIX_COMMANDS[ZT_UNIX_IP_COMMAND];
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if (!ipcmd)
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return false;
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long cpid = (long)vfork();
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if (cpid == 0) {
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execl(ipcmd,ipcmd,"addr","del",ip.toString().c_str(),"dev",_dev,(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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return (exitcode == 0);
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}
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}
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bool EthernetTap::addIP(const InetAddress &ip)
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{
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const char *ipcmd = UNIX_COMMANDS[ZT_UNIX_IP_COMMAND];
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if (!ipcmd) {
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LOG("ERROR: could not configure IP address for %s: unable to find 'ip' command on system (checked /sbin, /bin, /usr/sbin, /usr/bin)",_dev);
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return false;
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}
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Mutex::Lock _l(_ips_m);
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if (!ip)
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return false;
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if (_ips.count(ip) > 0)
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return true;
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// Remove and reconfigure if address is the same but netmask is different
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for(std::set<InetAddress>::iterator i(_ips.begin());i!=_ips.end();++i) {
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if (i->ipsEqual(ip)) {
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if (___removeIp(_dev,*i)) {
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_ips.erase(i);
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break;
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} else {
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LOG("WARNING: failed to remove old IP/netmask %s to replace with %s",i->toString().c_str(),ip.toString().c_str());
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}
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}
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}
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long cpid;
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if ((cpid = (long)vfork()) == 0) {
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execl(ipcmd,ipcmd,"addr","add",ip.toString().c_str(),"dev",_dev,(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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if (exitcode == 0) {
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_ips.insert(ip);
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return true;
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} else return false;
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}
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return false;
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}
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#endif // __LINUX__
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#ifdef __APPLE__
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static bool ___removeIp(const char *_dev,const InetAddress &ip)
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{
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const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
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if (!ifconfig)
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return false;
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long cpid;
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if ((cpid = (long)vfork()) == 0) {
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execl(ifconfig,ifconfig,_dev,"inet",ip.toIpString().c_str(),"-alias",(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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return (exitcode == 0);
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}
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return false; // never reached, make compiler shut up about return value
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}
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bool EthernetTap::addIP(const InetAddress &ip)
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{
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const char *ifconfig = UNIX_COMMANDS[ZT_UNIX_IFCONFIG_COMMAND];
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if (!ifconfig) {
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LOG("ERROR: could not configure IP address for %s: unable to find 'ifconfig' command on system (checked /sbin, /bin, /usr/sbin, /usr/bin)",_dev);
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return false;
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}
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Mutex::Lock _l(_ips_m);
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if (!ip)
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return false;
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if (_ips.count(ip) > 0)
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return true; // IP/netmask already assigned
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// Remove and reconfigure if address is the same but netmask is different
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for(std::set<InetAddress>::iterator i(_ips.begin());i!=_ips.end();++i) {
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if ((i->ipsEqual(ip))&&(i->netmaskBits() != ip.netmaskBits())) {
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if (___removeIp(_dev,*i)) {
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_ips.erase(i);
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break;
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} else {
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LOG("WARNING: failed to remove old IP/netmask %s to replace with %s",i->toString().c_str(),ip.toString().c_str());
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}
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}
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}
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long cpid;
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if ((cpid = (long)vfork()) == 0) {
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execl(ifconfig,ifconfig,_dev,ip.isV4() ? "inet" : "inet6",ip.toString().c_str(),"alias",(const char *)0);
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_exit(-1);
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} else {
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int exitcode = -1;
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waitpid(cpid,&exitcode,0);
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if (exitcode == 0) {
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_ips.insert(ip);
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return true;
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}
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}
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return false;
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}
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#endif // __APPLE__
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bool EthernetTap::removeIP(const InetAddress &ip)
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{
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Mutex::Lock _l(_ips_m);
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if (_ips.count(ip) > 0) {
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if (___removeIp(_dev,ip)) {
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_ips.erase(ip);
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return true;
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}
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}
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return false;
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}
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|
|
void EthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
|
|
{
|
|
char putBuf[4096 + 14];
|
|
if ((_fd > 0)&&(len <= _mtu)) {
|
|
for(int i=0;i<6;++i)
|
|
putBuf[i] = to.data[i];
|
|
for(int i=0;i<6;++i)
|
|
putBuf[i+6] = from.data[i];
|
|
*((uint16_t *)(putBuf + 12)) = htons((uint16_t)etherType);
|
|
memcpy(putBuf + 14,data,len);
|
|
len += 14;
|
|
int n = ::write(_fd,putBuf,len);
|
|
if (n <= 0) {
|
|
LOG("error writing packet to Ethernet tap device: %s",strerror(errno));
|
|
} else if (n != (int)len) {
|
|
// Saw this gremlin once, so log it if we see it again... OSX tap
|
|
// or something seems to have goofy issues with certain MTUs.
|
|
LOG("ERROR: write underrun: %s tap write() wrote %d of %u bytes of frame",_dev,n,len);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string EthernetTap::deviceName() const
|
|
{
|
|
return std::string(_dev);
|
|
}
|
|
|
|
#ifdef __LINUX__
|
|
bool EthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
|
|
{
|
|
char *ptr,*ptr2;
|
|
unsigned char mac[6];
|
|
std::set<MulticastGroup> newGroups;
|
|
|
|
int fd = ::open("/proc/net/dev_mcast",O_RDONLY);
|
|
if (fd > 0) {
|
|
char buf[131072];
|
|
int n = (int)::read(fd,buf,sizeof(buf));
|
|
if ((n > 0)&&(n < (int)sizeof(buf))) {
|
|
buf[n] = (char)0;
|
|
for(char *l=strtok_r(buf,"\r\n",&ptr);(l);l=strtok_r((char *)0,"\r\n",&ptr)) {
|
|
int fno = 0;
|
|
char *devname = (char *)0;
|
|
char *mcastmac = (char *)0;
|
|
for(char *f=strtok_r(l," \t",&ptr2);(f);f=strtok_r((char *)0," \t",&ptr2)) {
|
|
if (fno == 1)
|
|
devname = f;
|
|
else if (fno == 4)
|
|
mcastmac = f;
|
|
++fno;
|
|
}
|
|
if ((devname)&&(!strcmp(devname,_dev))&&(mcastmac)&&(Utils::unhex(mcastmac,mac,6) == 6))
|
|
newGroups.insert(MulticastGroup(MAC(mac),0));
|
|
}
|
|
}
|
|
::close(fd);
|
|
}
|
|
|
|
{
|
|
Mutex::Lock _l(_ips_m);
|
|
for(std::set<InetAddress>::const_iterator i(_ips.begin());i!=_ips.end();++i)
|
|
newGroups.insert(MulticastGroup::deriveMulticastGroupForAddressResolution(*i));
|
|
}
|
|
|
|
bool changed = false;
|
|
|
|
newGroups.insert(_blindWildcardMulticastGroup); // always join this
|
|
|
|
for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
|
|
if (!groups.count(*mg)) {
|
|
groups.insert(*mg);
|
|
changed = true;
|
|
}
|
|
}
|
|
for(std::set<MulticastGroup>::iterator mg(groups.begin());mg!=groups.end();) {
|
|
if (!newGroups.count(*mg)) {
|
|
groups.erase(mg++);
|
|
changed = true;
|
|
} else ++mg;
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
#endif // __LINUX__
|
|
|
|
#ifdef __APPLE__
|
|
bool EthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
|
|
{
|
|
std::set<MulticastGroup> newGroups;
|
|
struct ifmaddrs *ifmap = (struct ifmaddrs *)0;
|
|
if (!getifmaddrs(&ifmap)) {
|
|
struct ifmaddrs *p = ifmap;
|
|
while (p) {
|
|
if (p->ifma_addr->sa_family == AF_LINK) {
|
|
struct sockaddr_dl *in = (struct sockaddr_dl *)p->ifma_name;
|
|
struct sockaddr_dl *la = (struct sockaddr_dl *)p->ifma_addr;
|
|
if ((la->sdl_alen == 6)&&(in->sdl_nlen <= sizeof(_dev))&&(!memcmp(_dev,in->sdl_data,in->sdl_nlen)))
|
|
newGroups.insert(MulticastGroup(MAC(la->sdl_data + la->sdl_nlen),0));
|
|
}
|
|
p = p->ifma_next;
|
|
}
|
|
freeifmaddrs(ifmap);
|
|
}
|
|
|
|
{
|
|
Mutex::Lock _l(_ips_m);
|
|
for(std::set<InetAddress>::const_iterator i(_ips.begin());i!=_ips.end();++i)
|
|
newGroups.insert(MulticastGroup::deriveMulticastGroupForAddressResolution(*i));
|
|
}
|
|
|
|
bool changed = false;
|
|
|
|
newGroups.insert(_blindWildcardMulticastGroup); // always join this
|
|
|
|
for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
|
|
if (!groups.count(*mg)) {
|
|
groups.insert(*mg);
|
|
changed = true;
|
|
}
|
|
}
|
|
for(std::set<MulticastGroup>::iterator mg(groups.begin());mg!=groups.end();) {
|
|
if (!newGroups.count(*mg)) {
|
|
groups.erase(mg++);
|
|
changed = true;
|
|
} else ++mg;
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
#endif // __APPLE__
|
|
|
|
void EthernetTap::threadMain()
|
|
throw()
|
|
{
|
|
fd_set readfds,nullfds;
|
|
MAC to,from;
|
|
char getBuf[4096 + 14];
|
|
Buffer<4096> data;
|
|
|
|
// Wait for a moment after startup -- wait for Network to finish
|
|
// constructing itself.
|
|
Thread::sleep(500);
|
|
|
|
FD_ZERO(&readfds);
|
|
FD_ZERO(&nullfds);
|
|
int nfds = (int)std::max(_shutdownSignalPipe[0],_fd) + 1;
|
|
|
|
for(;;) {
|
|
FD_SET(_shutdownSignalPipe[0],&readfds);
|
|
FD_SET(_fd,&readfds);
|
|
select(nfds,&readfds,&nullfds,&nullfds,(struct timeval *)0);
|
|
|
|
if (FD_ISSET(_shutdownSignalPipe[0],&readfds)) // writes to shutdown pipe terminate thread
|
|
break;
|
|
|
|
if (FD_ISSET(_fd,&readfds)) {
|
|
int n = (int)::read(_fd,getBuf,_mtu + 14);
|
|
|
|
if (n > 14) {
|
|
for(int i=0;i<6;++i)
|
|
to.data[i] = (unsigned char)getBuf[i];
|
|
for(int i=0;i<6;++i)
|
|
from.data[i] = (unsigned char)getBuf[i + 6];
|
|
data.copyFrom(getBuf + 14,(unsigned int)n - 14);
|
|
_handler(_arg,from,to,ntohs(((const uint16_t *)getBuf)[6]),data);
|
|
} else if (n < 0) {
|
|
if ((errno != EINTR)&&(errno != ETIMEDOUT)) {
|
|
TRACE("unexpected error reading from tap: %s",strerror(errno));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif // __UNIX_LIKE__ //////////////////////////////////////////////////////
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifdef __WINDOWS__ ///////////////////////////////////////////////////////////
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <WinSock2.h>
|
|
#include <Windows.h>
|
|
#include <iphlpapi.h>
|
|
#include <ws2ipdef.h>
|
|
#include <WS2tcpip.h>
|
|
#include <tchar.h>
|
|
#include <winreg.h>
|
|
|
|
namespace ZeroTier {
|
|
|
|
static Mutex _systemTapInitLock;
|
|
|
|
EthernetTap::EthernetTap(
|
|
const RuntimeEnvironment *renv,
|
|
const char *tag,
|
|
const MAC &mac,
|
|
unsigned int mtu,
|
|
void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
|
|
void *arg)
|
|
throw(std::runtime_error) :
|
|
_mac(mac),
|
|
_mtu(mtu),
|
|
_r(renv),
|
|
_handler(handler),
|
|
_arg(arg)
|
|
{
|
|
char subkeyName[4096];
|
|
char subkeyClass[4096];
|
|
char data[4096];
|
|
|
|
Mutex::Lock _l(_systemTapInitLock); // only init one tap at a time, process-wide
|
|
|
|
HKEY nwAdapters;
|
|
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}",0,KEY_READ|KEY_WRITE,&nwAdapters) != ERROR_SUCCESS)
|
|
throw std::runtime_error("unable to open registry key for network adapter enumeration");
|
|
|
|
std::set<std::string> existingDeviceInstances;
|
|
std::string mySubkeyName;
|
|
|
|
// Enumerate all Microsoft Loopback Adapter instances and look for one
|
|
// that matches our tag.
|
|
for(DWORD subkeyIndex=0;subkeyIndex!=-1;) {
|
|
DWORD type;
|
|
DWORD dataLen;
|
|
DWORD subkeyNameLen = sizeof(subkeyName);
|
|
DWORD subkeyClassLen = sizeof(subkeyClass);
|
|
FILETIME lastWriteTime;
|
|
switch (RegEnumKeyExA(nwAdapters,subkeyIndex++,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime)) {
|
|
case ERROR_NO_MORE_ITEMS: subkeyIndex = -1; break;
|
|
case ERROR_SUCCESS:
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
data[dataLen] = '\0';
|
|
if (!strcmpi(data,"*msloop")) {
|
|
std::string instanceId;
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
instanceId.assign(data,dataLen);
|
|
existingDeviceInstances.insert(instanceId);
|
|
}
|
|
|
|
if ((_myDeviceInstanceId.length() == 0)&&(instanceId.length() != 0)) {
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
data[dataLen] = '\0';
|
|
if (!strcmp(data,tag)) {
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
_myDeviceInstanceId = instanceId;
|
|
mySubkeyName = subkeyName;
|
|
subkeyIndex = -1; // break outer loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If there is no device, try to create one
|
|
if (_myDeviceInstanceId.length() == 0) {
|
|
// Execute devcon to install an instance of the Microsoft Loopback Adapter
|
|
#ifdef _WIN64
|
|
const char *devcon = "\\devcon64.exe";
|
|
#else
|
|
BOOL f64 = FALSE;
|
|
const char *devcon = ((IsWow64Process(GetCurrentProcess(),&f64) == TRUE) ? "\\devcon64.exe" : "\\devcon32.exe");
|
|
#endif
|
|
char windir[4096];
|
|
windir[0] = '\0';
|
|
GetWindowsDirectoryA(windir,sizeof(windir));
|
|
STARTUPINFOA startupInfo;
|
|
startupInfo.cb = sizeof(startupInfo);
|
|
PROCESS_INFORMATION processInfo;
|
|
memset(&startupInfo,0,sizeof(STARTUPINFOA));
|
|
memset(&processInfo,0,sizeof(PROCESS_INFORMATION));
|
|
if (!CreateProcessA(NULL,(LPSTR)(std::string("\"") + _r->homePath + devcon + "\" install " + windir + "\\inf\\netloop.inf *msloop").c_str(),NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo)) {
|
|
RegCloseKey(nwAdapters);
|
|
throw std::runtime_error(std::string("unable to find or execute devcon at ")+devcon);
|
|
}
|
|
WaitForSingleObject(processInfo.hProcess,INFINITE);
|
|
CloseHandle(processInfo.hProcess);
|
|
CloseHandle(processInfo.hThread);
|
|
|
|
// Scan for that new instance by looking for adapters of type
|
|
// *msloop that we did not already see on the first scan.
|
|
for(DWORD subkeyIndex=0;subkeyIndex!=-1;) {
|
|
DWORD type;
|
|
DWORD dataLen;
|
|
DWORD subkeyNameLen = sizeof(subkeyName);
|
|
DWORD subkeyClassLen = sizeof(subkeyClass);
|
|
FILETIME lastWriteTime;
|
|
switch (RegEnumKeyExA(nwAdapters,subkeyIndex++,subkeyName,&subkeyNameLen,(DWORD *)0,subkeyClass,&subkeyClassLen,&lastWriteTime)) {
|
|
case ERROR_NO_MORE_ITEMS: subkeyIndex = -1; break;
|
|
case ERROR_SUCCESS:
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"ComponentId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
data[dataLen] = '\0';
|
|
if (!strcmpi(data,"*msloop")) {
|
|
type = 0;
|
|
dataLen = sizeof(data);
|
|
if (RegGetValueA(nwAdapters,subkeyName,"NetCfgInstanceId",RRF_RT_ANY,&type,(PVOID)data,&dataLen) == ERROR_SUCCESS) {
|
|
if (existingDeviceInstances.count(std::string(data,dataLen)) == 0) {
|
|
RegSetKeyValueA(nwAdapters,subkeyName,"_ZeroTierTapIdentifier",REG_SZ,tag,strlen(tag)+1);
|
|
_myDeviceInstanceId.assign(data,dataLen);
|
|
mySubkeyName = subkeyName;
|
|
subkeyIndex = -1; // break outer loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (_myDeviceInstanceId.length() > 0) {
|
|
char tmps[4096];
|
|
sprintf_s(tmps,"%.2X-%.2X-%.2X-%.2X-%.2X-%.2X",(unsigned int)mac.data[0],(unsigned int)mac.data[1],(unsigned int)mac.data[2],(unsigned int)mac.data[3],(unsigned int)mac.data[4],(unsigned int)mac.data[5]);
|
|
RegSetKeyValueA(nwAdapters,mySubkeyName.c_str(),"NetworkAddress",REG_SZ,tmps,strlen(tmps)+1);
|
|
DWORD tmp = mtu;
|
|
RegSetKeyValueA(nwAdapters,mySubkeyName.c_str(),"MTU",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
|
|
tmp = 0;
|
|
RegSetKeyValueA(nwAdapters,mySubkeyName.c_str(),"EnableDHCP",REG_DWORD,(LPCVOID)&tmp,sizeof(tmp));
|
|
RegSetKeyValueA(nwAdapters,mySubkeyName.c_str(),"DriverDesc",REG_SZ,"ZeroTier One Virtual LAN",25);
|
|
}
|
|
|
|
RegCloseKey(nwAdapters);
|
|
|
|
if (_myDeviceInstanceId.length() == 0)
|
|
throw std::runtime_error("unable to create new loopback adapter for tap");
|
|
|
|
//Thread::start(this);
|
|
}
|
|
|
|
EthernetTap::~EthernetTap()
|
|
{
|
|
}
|
|
|
|
void EthernetTap::whack()
|
|
{
|
|
}
|
|
|
|
bool EthernetTap::addIP(const InetAddress &ip)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
bool EthernetTap::removeIP(const InetAddress &ip)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
void EthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
|
|
{
|
|
if (len > (ZT_IF_MTU))
|
|
return;
|
|
|
|
{
|
|
Mutex::Lock _l(_injectPending_m);
|
|
_injectPending.push( std::pair<Array<char,ZT_IF_MTU + 32>,unsigned int>(Array<char,ZT_IF_MTU + 32>(),len + 14) );
|
|
char *d = _injectPending.back().first.data;
|
|
memcpy(d,to.data,6);
|
|
memcpy(d + 6,from.data,6);
|
|
*((uint16_t *)(d + 12)) = Utils::hton(etherType);
|
|
memcpy(d + 14,data,len);
|
|
}
|
|
|
|
//ReleaseSemaphore(_pcapIoThread.updateSem,1,NULL);
|
|
}
|
|
|
|
std::string EthernetTap::deviceName() const
|
|
{
|
|
return _myDeviceInstanceId;
|
|
}
|
|
|
|
bool EthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
|
|
{
|
|
// TODO
|
|
return false;
|
|
}
|
|
|
|
void EthernetTap::threadMain()
|
|
throw()
|
|
{
|
|
}
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif // __WINDOWS__ ////////////////////////////////////////////////////////
|