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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 <stdarg.h>
#include <stdexcept>
#include "IpcConnection.hpp"
#ifndef __WINDOWS__
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#endif
namespace ZeroTier {
IpcConnection::IpcConnection(const char *endpoint,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
_handler(commandHandler),
_arg(arg),
#ifdef __WINDOWS__
_sock(INVALID_HANDLE_VALUE),
_incoming(false),
#else
_sock(-1),
#endif
_run(true),
_running(true)
{
#ifdef __WINDOWS__
_sock = CreateFileA(endpoint,GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,NULL,OPEN_EXISTING,0,NULL);
if (_sock == INVALID_HANDLE_VALUE)
throw std::runtime_error("IPC endpoint unreachable");
DWORD pipeMode = PIPE_READMODE_BYTE;
SetNamedPipeHandleState(_sock,&pipeMode,NULL,NULL);
#else
struct sockaddr_un unaddr;
unaddr.sun_family = AF_UNIX;
strncpy(unaddr.sun_path,endpoint,sizeof(unaddr.sun_path));
unaddr.sun_path[sizeof(unaddr.sun_path) - 1] = (char)0;
_sock = socket(AF_UNIX,SOCK_STREAM,0);
if (_sock <= 0)
throw std::runtime_error("unable to create socket of type AF_UNIX");
if (connect(_sock,(struct sockaddr *)&unaddr,sizeof(unaddr))) {
::close(_sock);
throw std::runtime_error("IPC endpoint unreachable");
}
#endif
_thread = Thread::start(this);
}
#ifdef __WINDOWS__
IpcConnection::IpcConnection(HANDLE s,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
#else
IpcConnection::IpcConnection(int s,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
#endif
_handler(commandHandler),
_arg(arg),
_sock(s),
#ifdef __WINDOWS__
_incoming(true),
#endif
_run(true),
_running(true)
{
_thread = Thread::start(this);
}
IpcConnection::~IpcConnection()
{
_writeLock.lock();
_run = false;
_writeLock.unlock();
#ifdef __WINDOWS__
while (_running) {
Thread::cancelIO(_thread);
Sleep(100);
}
#else
int s = _sock;
_sock = 0;
if (s > 0) {
::shutdown(s,SHUT_RDWR);
::close(s);
}
#endif
}
void IpcConnection::printf(const char *format,...)
{
va_list ap;
int n;
char tmp[65536];
va_start(ap,format);
n = (int)::vsnprintf(tmp,sizeof(tmp),format,ap);
va_end(ap);
if (n <= 0)
return;
Mutex::Lock _l(_writeLock);
#ifdef __WINDOWS__
_writeBuf.append(tmp,n);
Thread::cancelIO(_thread);
#else
if (_sock > 0)
::write(_sock,tmp,n);
#endif
}
void IpcConnection::threadMain()
throw()
{
char tmp[65536];
char linebuf[65536];
unsigned int lineptr = 0;
char c;
#ifdef __WINDOWS__
DWORD n,i;
std::string wbuf;
#else
int s,n,i;
#endif
while (_run) {
#ifdef __WINDOWS__
{
Mutex::Lock _l(_writeLock);
if (!_run)
break;
if (_writeBuf.length() > 0) {
wbuf.append(_writeBuf);
_writeBuf.clear();
}
}
if (wbuf.length() > 0) {
n = 0;
if ((WriteFile(_sock,wbuf.data(),(DWORD)(wbuf.length()),&n,NULL))&&(n > 0)) {
if (n < (DWORD)wbuf.length())
wbuf.erase(0,n);
else wbuf.clear();
} else if (GetLastError() != ERROR_OPERATION_ABORTED)
break;
FlushFileBuffers(_sock);
}
if (!_run)
break;
n = 0;
if ((!ReadFile(_sock,tmp,sizeof(tmp),&n,NULL))||(n <= 0)) {
if (GetLastError() == ERROR_OPERATION_ABORTED)
n = 0;
else break;
}
if (!_run)
break;
#else
if ((s = _sock) <= 0)
break;
n = (int)::read(s,tmp,sizeof(tmp));
if ((n <= 0)||(_sock <= 0))
break;
#endif
for(i=0;i<n;++i) {
c = (linebuf[lineptr] = tmp[i]);
if ((c == '\r')||(c == '\n')||(lineptr == (sizeof(linebuf) - 1))) {
if (lineptr) {
linebuf[lineptr] = (char)0;
_handler(_arg,this,IPC_EVENT_COMMAND,linebuf);
lineptr = 0;
}
} else ++lineptr;
}
}
_writeLock.lock();
bool r = _run;
_writeLock.unlock();
#ifdef __WINDOWS__
if (_incoming)
DisconnectNamedPipe(_sock);
CloseHandle(_sock);
_running = false;
#endif
if (r)
_handler(_arg,this,IPC_EVENT_CONNECTION_CLOSED,(const char *)0);
}
} // namespace ZeroTier
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