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-rw-r--r--node/osdep/LinuxEthernetTap.cpp474
1 files changed, 0 insertions, 474 deletions
diff --git a/node/osdep/LinuxEthernetTap.cpp b/node/osdep/LinuxEthernetTap.cpp
deleted file mode 100644
index 0b0c1c4f..00000000
--- a/node/osdep/LinuxEthernetTap.cpp
+++ /dev/null
@@ -1,474 +0,0 @@
-/*
- * ZeroTier One - Global Peer to Peer Ethernet
- * Copyright (C) 2011-2014 ZeroTier Networks LLC
- *
- * 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/>.
- *
- * --
- *
- * ZeroTier may be used and distributed under the terms of the GPLv3, which
- * are available at: http://www.gnu.org/licenses/gpl-3.0.html
- *
- * If you would like to embed ZeroTier into a commercial application or
- * redistribute it in a modified binary form, please contact ZeroTier Networks
- * LLC. Start here: http://www.zerotier.com/
- */
-
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <signal.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <sys/wait.h>
-#include <sys/select.h>
-#include <netinet/in.h>
-#include <net/if_arp.h>
-#include <arpa/inet.h>
-#include <linux/if.h>
-#include <linux/if_tun.h>
-#include <linux/if_addr.h>
-#include <linux/if_ether.h>
-#include <ifaddrs.h>
-
-#include <string>
-#include <map>
-#include <set>
-#include <algorithm>
-
-#include "../Constants.hpp"
-#include "../Utils.hpp"
-#include "../Mutex.hpp"
-#include "LinuxEthernetTap.hpp"
-
-// ff:ff:ff:ff:ff:ff with no ADI
-static const ZeroTier::MulticastGroup _blindWildcardMulticastGroup(ZeroTier::MAC(0xff),0);
-
-// On startup, searches the path for required external utilities (which might vary by Linux distro)
-#define ZT_UNIX_IP_COMMAND 1
-class _CommandFinder
-{
-public:
- _CommandFinder()
- {
- _findCmd(ZT_UNIX_IP_COMMAND,"ip");
- }
- inline const char *operator[](int id) const
- throw()
- {
- std::map<int,std::string>::const_iterator c(_paths.find(id));
- if (c == _paths.end())
- return (const char *)0;
- return c->second.c_str();
- }
-private:
- inline void _findCmd(int id,const char *name)
- {
- char tmp[4096];
- ZeroTier::Utils::snprintf(tmp,sizeof(tmp),"/sbin/%s",name);
- if (ZeroTier::Utils::fileExists(tmp)) {
- _paths[id] = tmp;
- return;
- }
- ZeroTier::Utils::snprintf(tmp,sizeof(tmp),"/usr/sbin/%s",name);
- if (ZeroTier::Utils::fileExists(tmp)) {
- _paths[id] = tmp;
- return;
- }
- ZeroTier::Utils::snprintf(tmp,sizeof(tmp),"/bin/%s",name);
- if (ZeroTier::Utils::fileExists(tmp)) {
- _paths[id] = tmp;
- return;
- }
- ZeroTier::Utils::snprintf(tmp,sizeof(tmp),"/usr/bin/%s",name);
- if (ZeroTier::Utils::fileExists(tmp)) {
- _paths[id] = tmp;
- return;
- }
- }
- std::map<int,std::string> _paths;
-};
-static const _CommandFinder UNIX_COMMANDS;
-
-namespace ZeroTier {
-
-// Only permit one tap to be opened concurrently across the entire process
-static Mutex __tapCreateLock;
-
-LinuxEthernetTap::LinuxEthernetTap(
- const RuntimeEnvironment *renv,
- const char *tryToGetDevice,
- const MAC &mac,
- unsigned int mtu,
- void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
- void *arg)
- throw(std::runtime_error) :
- EthernetTap("LinuxEthernetTap",mac,mtu),
- _r(renv),
- _handler(handler),
- _arg(arg),
- _fd(0),
- _enabled(true)
-{
- char procpath[128];
- struct stat sbuf;
- Mutex::Lock _l(__tapCreateLock); // create only one tap at a time, globally
-
- if (mtu > 4096)
- throw std::runtime_error("max tap MTU is 4096");
-
- _fd = ::open("/dev/net/tun",O_RDWR);
- if (_fd <= 0)
- throw std::runtime_error(std::string("could not open TUN/TAP device: ") + strerror(errno));
-
- struct ifreq ifr;
- memset(&ifr,0,sizeof(ifr));
-
- // Try to recall our last device name, or pick an unused one if that fails.
- bool recalledDevice = false;
- if ((tryToGetDevice)&&(tryToGetDevice[0])) {
- Utils::scopy(ifr.ifr_name,sizeof(ifr.ifr_name),tryToGetDevice);
- Utils::snprintf(procpath,sizeof(procpath),"/proc/sys/net/ipv4/conf/%s",ifr.ifr_name);
- recalledDevice = (stat(procpath,&sbuf) != 0);
- }
- if (!recalledDevice) {
- int devno = 0;
- do {
- Utils::snprintf(ifr.ifr_name,sizeof(ifr.ifr_name),"zt%d",devno++);
- Utils::snprintf(procpath,sizeof(procpath),"/proc/sys/net/ipv4/conf/%s",ifr.ifr_name);
- } while (stat(procpath,&sbuf) == 0); // try zt#++ until we find one that does not exist
- }
-
- ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
- if (ioctl(_fd,TUNSETIFF,(void *)&ifr) < 0) {
- ::close(_fd);
- throw std::runtime_error("unable to configure TUN/TAP device for TAP operation");
- }
-
- _dev = ifr.ifr_name;
-
- ioctl(_fd,TUNSETPERSIST,0); // valgrind may generate a false alarm here
-
- // Open an arbitrary socket to talk to netlink
- int sock = socket(AF_INET,SOCK_DGRAM,0);
- if (sock <= 0) {
- ::close(_fd);
- throw std::runtime_error("unable to open netlink socket");
- }
-
- // Set MAC address
- ifr.ifr_ifru.ifru_hwaddr.sa_family = ARPHRD_ETHER;
- mac.copyTo(ifr.ifr_ifru.ifru_hwaddr.sa_data,6);
- if (ioctl(sock,SIOCSIFHWADDR,(void *)&ifr) < 0) {
- ::close(_fd);
- ::close(sock);
- throw std::runtime_error("unable to configure TAP hardware (MAC) address");
- return;
- }
-
- // Set MTU
- ifr.ifr_ifru.ifru_mtu = (int)mtu;
- if (ioctl(sock,SIOCSIFMTU,(void *)&ifr) < 0) {
- ::close(_fd);
- ::close(sock);
- throw std::runtime_error("unable to configure TAP MTU");
- }
-
- if (fcntl(_fd,F_SETFL,fcntl(_fd,F_GETFL) & ~O_NONBLOCK) == -1) {
- ::close(_fd);
- throw std::runtime_error("unable to set flags on file descriptor for TAP device");
- }
-
- /* Bring interface up */
- if (ioctl(sock,SIOCGIFFLAGS,(void *)&ifr) < 0) {
- ::close(_fd);
- ::close(sock);
- throw std::runtime_error("unable to get TAP interface flags");
- }
- ifr.ifr_flags |= IFF_UP;
- if (ioctl(sock,SIOCSIFFLAGS,(void *)&ifr) < 0) {
- ::close(_fd);
- ::close(sock);
- throw std::runtime_error("unable to set TAP interface flags");
- }
-
- ::close(sock);
-
- // Set close-on-exec so that devices cannot persist if we fork/exec for update
- fcntl(_fd,F_SETFD,fcntl(_fd,F_GETFD) | FD_CLOEXEC);
-
- ::pipe(_shutdownSignalPipe);
-
- _thread = Thread::start(this);
-}
-
-LinuxEthernetTap::~LinuxEthernetTap()
-{
- ::write(_shutdownSignalPipe[1],"\0",1); // causes thread to exit
- Thread::join(_thread);
- ::close(_fd);
- ::close(_shutdownSignalPipe[0]);
- ::close(_shutdownSignalPipe[1]);
-}
-
-void LinuxEthernetTap::setEnabled(bool en)
-{
- _enabled = en;
- // TODO: interface status change
-}
-
-bool LinuxEthernetTap::enabled() const
-{
- return _enabled;
-}
-
-static bool ___removeIp(const std::string &_dev,const InetAddress &ip)
-{
- const char *ipcmd = UNIX_COMMANDS[ZT_UNIX_IP_COMMAND];
- if (!ipcmd)
- return false;
- long cpid = (long)vfork();
- if (cpid == 0) {
- execl(ipcmd,ipcmd,"addr","del",ip.toString().c_str(),"dev",_dev.c_str(),(const char *)0);
- _exit(-1);
- } else {
- int exitcode = -1;
- waitpid(cpid,&exitcode,0);
- return (exitcode == 0);
- }
-}
-
-bool LinuxEthernetTap::addIP(const InetAddress &ip)
-{
- const char *ipcmd = UNIX_COMMANDS[ZT_UNIX_IP_COMMAND];
- if (!ipcmd) {
- LOG("ERROR: could not configure IP address for %s: unable to find 'ip' command on system (checked /sbin, /bin, /usr/sbin, /usr/bin)",_dev.c_str());
- return false;
- }
-
- if (!ip)
- return false;
-
- std::set<InetAddress> allIps(ips());
- if (allIps.count(ip) > 0)
- return true;
-
- // Remove and reconfigure if address is the same but netmask is different
- for(std::set<InetAddress>::iterator i(allIps.begin());i!=allIps.end();++i) {
- if (i->ipsEqual(ip)) {
- if (___removeIp(_dev,*i)) {
- break;
- } else {
- LOG("WARNING: failed to remove old IP/netmask %s to replace with %s",i->toString().c_str(),ip.toString().c_str());
- }
- }
- }
-
- long cpid;
- if ((cpid = (long)vfork()) == 0) {
- execl(ipcmd,ipcmd,"addr","add",ip.toString().c_str(),"dev",_dev.c_str(),(const char *)0);
- _exit(-1);
- } else if (cpid > 0) {
- int exitcode = -1;
- waitpid(cpid,&exitcode,0);
- return (exitcode == 0);
- }
-
- return false;
-}
-
-bool LinuxEthernetTap::removeIP(const InetAddress &ip)
-{
- if (ips().count(ip) > 0) {
- if (___removeIp(_dev,ip))
- return true;
- }
- return false;
-}
-
-std::set<InetAddress> LinuxEthernetTap::ips() const
-{
- struct ifaddrs *ifa = (struct ifaddrs *)0;
- if (getifaddrs(&ifa))
- return std::set<InetAddress>();
-
- std::set<InetAddress> r;
-
- struct ifaddrs *p = ifa;
- while (p) {
- if ((!strcmp(p->ifa_name,_dev.c_str()))&&(p->ifa_addr)&&(p->ifa_netmask)&&(p->ifa_addr->sa_family == p->ifa_netmask->sa_family)) {
- switch(p->ifa_addr->sa_family) {
- case AF_INET: {
- struct sockaddr_in *sin = (struct sockaddr_in *)p->ifa_addr;
- struct sockaddr_in *nm = (struct sockaddr_in *)p->ifa_netmask;
- r.insert(InetAddress(&(sin->sin_addr.s_addr),4,Utils::countBits((uint32_t)nm->sin_addr.s_addr)));
- } break;
- case AF_INET6: {
- struct sockaddr_in6 *sin = (struct sockaddr_in6 *)p->ifa_addr;
- struct sockaddr_in6 *nm = (struct sockaddr_in6 *)p->ifa_netmask;
- uint32_t b[4];
- memcpy(b,nm->sin6_addr.s6_addr,sizeof(b));
- r.insert(InetAddress(sin->sin6_addr.s6_addr,16,Utils::countBits(b[0]) + Utils::countBits(b[1]) + Utils::countBits(b[2]) + Utils::countBits(b[3])));
- } break;
- }
- }
- p = p->ifa_next;
- }
-
- if (ifa)
- freeifaddrs(ifa);
-
- return r;
-}
-
-void LinuxEthernetTap::put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len)
-{
- char putBuf[8194];
- if ((_fd > 0)&&(len <= _mtu)&&(_enabled)) {
- to.copyTo(putBuf,6);
- from.copyTo(putBuf + 6,6);
- *((uint16_t *)(putBuf + 12)) = htons((uint16_t)etherType);
- memcpy(putBuf + 14,data,len);
- len += 14;
- ::write(_fd,putBuf,len);
- }
-}
-
-std::string LinuxEthernetTap::deviceName() const
-{
- return _dev;
-}
-
-std::string LinuxEthernetTap::persistentId() const
-{
- return std::string();
-}
-
-bool LinuxEthernetTap::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.c_str()))&&(mcastmac)&&(Utils::unhex(mcastmac,mac,6) == 6))
- newGroups.insert(MulticastGroup(MAC(mac,6),0));
- }
- }
- ::close(fd);
- }
-
- {
- std::set<InetAddress> allIps(ips());
- for(std::set<InetAddress>::const_iterator i(allIps.begin());i!=allIps.end();++i)
- newGroups.insert(MulticastGroup::deriveMulticastGroupForAddressResolution(*i));
- }
-
- bool changed = false;
-
- 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))&&(*mg != _blindWildcardMulticastGroup)) {
- groups.erase(mg++);
- changed = true;
- } else ++mg;
- }
-
- return changed;
-}
-
-void LinuxEthernetTap::threadMain()
- throw()
-{
- fd_set readfds,nullfds;
- MAC to,from;
- int n,nfds,r;
- char getBuf[8194];
- 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);
- nfds = (int)std::max(_shutdownSignalPipe[0],_fd) + 1;
-
- r = 0;
- 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)) {
- n = (int)::read(_fd,getBuf + r,sizeof(getBuf) - r);
- if (n < 0) {
- if ((errno != EINTR)&&(errno != ETIMEDOUT)) {
- TRACE("unexpected error reading from tap: %s",strerror(errno));
- break;
- }
- } else {
- // Some tap drivers like to send the ethernet frame and the
- // payload in two chunks, so handle that by accumulating
- // data until we have at least a frame.
- r += n;
- if (r > 14) {
- if (r > ((int)_mtu + 14)) // sanity check for weird TAP behavior on some platforms
- r = _mtu + 14;
-
- if (_enabled) {
- to.setTo(getBuf,6);
- from.setTo(getBuf + 6,6);
- unsigned int etherType = ntohs(((const uint16_t *)getBuf)[6]);
- data.copyFrom(getBuf + 14,(unsigned int)r - 14);
- _handler(_arg,from,to,etherType,data);
- }
-
- r = 0;
- }
- }
- }
- }
-}
-
-} // namespace ZeroTier
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