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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 <errno.h>
#include "IpcListener.hpp"
#ifndef __WINDOWS__
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#endif
namespace ZeroTier {
IpcListener::IpcListener(const char *ep,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
_endpoint(ep),
_handler(commandHandler),
_arg(arg),
#ifdef __WINDOWS__
_run(true),
_running(true)
#else
_sock(0)
#endif
{
#ifndef __WINDOWS__
struct sockaddr_un unaddr;
unaddr.sun_family = AF_UNIX;
strncpy(unaddr.sun_path,_endpoint.c_str(),sizeof(unaddr.sun_path));
unaddr.sun_path[sizeof(unaddr.sun_path) - 1] = (char)0;
struct stat stattmp;
if (stat(_endpoint.c_str(),&stattmp)) {
int testSock = socket(AF_UNIX,SOCK_STREAM,0);
if (testSock <= 0)
throw std::runtime_error("unable to create socket of type AF_UNIX");
if (connect(testSock,(struct sockaddr *)&unaddr,sizeof(unaddr))) {
// error means nothing is listening, orphaned name
::close(testSock);
} else {
// success means endpoint is being actively listened to by a process
::close(testSock);
throw std::runtime_error("IPC endpoint address in use");
}
}
::unlink(_endpoint.c_str());
_sock = socket(AF_UNIX,SOCK_STREAM,0);
if (_sock <= 0)
throw std::runtime_error("unable to create socket of type AF_UNIX");
if (bind(_sock,(struct sockaddr *)&unaddr,sizeof(unaddr))) {
::close(_sock);
throw std::runtime_error("IPC endpoint could not be bound");
}
if (listen(_sock,8)) {
::close(_sock);
throw std::runtime_error("listen() failed for bound AF_UNIX socket");
}
#endif
_thread = Thread::start(this);
}
IpcListener::~IpcListener()
{
#ifdef __WINDOWS__
_run = false;
while (_running) {
Thread::cancelIO(_thread);
HANDLE tmp = CreateFileA(_endpoint.c_str(),GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,NULL,OPEN_EXISTING,0,NULL);
if (tmp != INVALID_HANDLE_VALUE)
CloseHandle(tmp);
Sleep(250);
}
#else
int s = _sock;
_sock = 0;
if (s > 0) {
::shutdown(s,SHUT_RDWR);
::close(s);
}
Thread::join(_thread);
::unlink(_endpoint.c_str());
#endif
}
void IpcListener::threadMain()
throw()
{
#ifdef __WINDOWS__
HANDLE s;
while (_run) {
s = CreateNamedPipeA(_endpoint.c_str(),PIPE_ACCESS_DUPLEX,PIPE_READMODE_BYTE|PIPE_TYPE_BYTE|PIPE_WAIT,PIPE_UNLIMITED_INSTANCES,1024,1024,0,NULL);
if (s != INVALID_HANDLE_VALUE) {
if ((ConnectNamedPipe(s,NULL))||(GetLastError() == ERROR_PIPE_CONNECTED)) {
if (!_run) {
DisconnectNamedPipe(s);
CloseHandle(s);
break;
}
try {
_handler(_arg,new IpcConnection(s,_handler,_arg),IpcConnection::IPC_EVENT_NEW_CONNECTION,(const char *)0);
} catch ( ... ) {} // handlers should not throw
} else {
CloseHandle(s);
}
}
}
_running = false;
#else
struct sockaddr_un unaddr;
socklen_t socklen;
int s;
while (_sock > 0) {
unaddr.sun_family = AF_UNIX;
strncpy(unaddr.sun_path,_endpoint.c_str(),sizeof(unaddr.sun_path));
unaddr.sun_path[sizeof(unaddr.sun_path) - 1] = (char)0;
socklen = sizeof(unaddr);
s = accept(_sock,(struct sockaddr *)&unaddr,&socklen);
if (s <= 0)
break;
if (!_sock) {
::close(s);
break;
}
try {
_handler(_arg,new IpcConnection(s,_handler,_arg),IpcConnection::IPC_EVENT_NEW_CONNECTION,(const char *)0);
} catch ( ... ) {} // handlers should not throw
}
#endif
}
} // namespace ZeroTier
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