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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "OSXEthernetTapFactory.hpp"
#include "OSXEthernetTap.hpp"
namespace ZeroTier {
OSXEthernetTapFactory::OSXEthernetTapFactory(const char *pathToTapKext,const char *tapKextName)
_pathToTapKext((pathToTapKext) ? pathToTapKext : ""),
_tapKextName((tapKextName) ? tapKextName : "")
{
struct stat stattmp;
if ((_pathToTapKext.length())&&(_tapKextName.length())) {
if (stat("/dev/zt0",&stattmp)) {
long kextpid = (long)vfork();
if (kextpid == 0) {
::chdir(_pathToTapKext.c_str());
::execl("/sbin/kextload","/sbin/kextload","-q","-repository",_pathToTapKext.c_str(),_tapKextName.c_str(),(const char *)0);
::_exit(-1);
} else if (kextpid > 0) {
int exitcode = -1;
::waitpid(kextpid,&exitcode,0);
} else throw std::runtime_error("unable to create subprocess with fork()");
}
}
if (stat("/dev/zt0",&stattmp)) {
::usleep(500); // give tap device driver time to start up and try again
if (stat("/dev/zt0",&stattmp))
throw std::runtime_error("/dev/zt# tap devices do not exist and unable to load kernel extension");
}
}
OSXEthernetTapFactory::~OSXEthernetTapFactory()
{
Mutex::Lock _l(_devices_m);
for(std::vector<EthernetTap *>::iterator d(_devices.begin());d!=_devices.end();++d)
delete *d;
if ((_pathToTapKext.length())&&(_tapKextName.length())) {
// Attempt to unload kext. If anything else is using a /dev/zt# node, this
// fails and the kext stays in the kernel.
char tmp[16384];
sprintf(tmp,"%s/%s",_pathToTapKext.c_str(),_tapKextName.c_str());
long kextpid = (long)vfork();
if (kextpid == 0) {
::execl("/sbin/kextunload","/sbin/kextunload",tmp,(const char *)0);
::_exit(-1);
} else if (kextpid > 0) {
int exitcode = -1;
::waitpid(kextpid,&exitcode,0);
}
}
}
EthernetTap *OSXEthernetTapFactory::open(
const MAC &mac,
unsigned int mtu,
unsigned int metric,
uint64_t nwid,
const char *desiredDevice,
const char *friendlyName,
void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
void *arg)
{
Mutex::Lock _l(_devices_m);
EthernetTap *t = new OSXEthernetTap(mac,mtu,metric,nwid,desiredDevice,friendlyName,handler,arg);
_devices.push_back(t);
return t;
}
void OSXEthernetTapFactory::close(EthernetTap *tap,bool destroyPersistentDevices)
{
{
Mutex::Lock _l(_devices_m);
for(std::vector<EthernetTap *>::iterator d(_devices.begin());d!=_devices.end();++d) {
if (*d == tap) {
_devices.erase(d);
break;
}
}
}
delete tap;
}
} // namespace ZeroTier
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