mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-20 13:33:07 +00:00
282 lines
7.0 KiB
C++
282 lines
7.0 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2011-2014 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdexcept>
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#include "IpcConnection.hpp"
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#ifndef __WINDOWS__
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#endif
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namespace ZeroTier {
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IpcConnection::IpcConnection(const char *endpoint,unsigned int timeout,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
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_handler(commandHandler),
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_arg(arg),
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_timeout(timeout),
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#ifdef __WINDOWS__
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_sock(INVALID_HANDLE_VALUE),
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_incoming(false),
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#else
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_sock(-1),
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#endif
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_run(true),
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_running(true)
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{
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#ifdef __WINDOWS__
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_sock = CreateFileA(endpoint,GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,NULL,OPEN_EXISTING,0,NULL);
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if (_sock == INVALID_HANDLE_VALUE)
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throw std::runtime_error("IPC endpoint unreachable");
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DWORD pipeMode = PIPE_READMODE_BYTE;
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SetNamedPipeHandleState(_sock,&pipeMode,NULL,NULL);
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#else
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struct sockaddr_un unaddr;
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unaddr.sun_family = AF_UNIX;
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strncpy(unaddr.sun_path,endpoint,sizeof(unaddr.sun_path));
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unaddr.sun_path[sizeof(unaddr.sun_path) - 1] = (char)0;
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_sock = socket(AF_UNIX,SOCK_STREAM,0);
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if (_sock <= 0)
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throw std::runtime_error("unable to create socket of type AF_UNIX");
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if (connect(_sock,(struct sockaddr *)&unaddr,sizeof(unaddr))) {
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::close(_sock);
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throw std::runtime_error("IPC endpoint unreachable");
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}
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#endif
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_thread = Thread::start(this);
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}
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#ifdef __WINDOWS__
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IpcConnection::IpcConnection(HANDLE s,unsigned int timeout,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
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#else
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IpcConnection::IpcConnection(int s,unsigned int timeout,void (*commandHandler)(void *,IpcConnection *,IpcConnection::EventType,const char *),void *arg) :
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#endif
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_handler(commandHandler),
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_arg(arg),
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_timeout(timeout),
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_sock(s),
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#ifdef __WINDOWS__
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_incoming(true),
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#endif
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_run(true),
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_running(true)
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{
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_thread = Thread::start(this);
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}
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IpcConnection::~IpcConnection()
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{
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_writeLock.lock();
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_run = false;
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_writeLock.unlock();
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#ifdef __WINDOWS__
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while (_running) {
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Thread::cancelIO(_thread); // cause Windows to break from blocking read and detect shutdown
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Sleep(100);
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}
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#else // !__WINDOWS__
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int s = _sock;
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_sock = 0;
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if (s > 0) {
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::shutdown(s,SHUT_RDWR);
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::close(s);
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}
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Thread::join(_thread);
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#endif // __WINDOWS__ / !__WINDOWS__
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}
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void IpcConnection::printf(const char *format,...)
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{
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va_list ap;
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int n;
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char tmp[65536];
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va_start(ap,format);
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n = (int)::vsnprintf(tmp,sizeof(tmp),format,ap);
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va_end(ap);
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if (n <= 0)
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return;
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Mutex::Lock _l(_writeLock);
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#ifdef __WINDOWS__
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_writeBuf.append(tmp,n);
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Thread::cancelIO(_thread); // cause Windows to break from blocking read and service write buffer
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#else
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if (_sock > 0)
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::write(_sock,tmp,n);
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#endif
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}
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void IpcConnection::threadMain()
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throw()
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{
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char tmp[16384];
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char linebuf[16384];
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unsigned int lineptr = 0;
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char c;
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#ifdef __WINDOWS__
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DWORD n,i;
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std::string wbuf;
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#else // !__WINDOWS__
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int s,n,i;
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fd_set readfds,writefds,errorfds;
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struct timeval tout;
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#ifdef SO_NOSIGPIPE
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if (_sock > 0) {
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i = 1;
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::setsockopt(_sock,SOL_SOCKET,SO_NOSIGPIPE,(char *)&i,sizeof(i));
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}
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#endif // SO_NOSIGPIPE
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#endif // __WINDOWS__ / !__WINDOWS__
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while (_run) {
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#ifdef __WINDOWS__
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/* Note that we do not use fucking timeouts in Windows, since it does seem
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* to properly detect named pipe endpoint close. But we do use a write buffer
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* because Windows won't let you divorce reading and writing threads without
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* all that OVERLAPPED cruft. */
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{
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Mutex::Lock _l(_writeLock);
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if (!_run)
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break;
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if (_writeBuf.length() > 0) {
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wbuf.append(_writeBuf);
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_writeBuf.clear();
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}
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}
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if (wbuf.length() > 0) {
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n = 0;
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if ((WriteFile(_sock,wbuf.data(),(DWORD)(wbuf.length()),&n,NULL))&&(n > 0)) {
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if (n < (DWORD)wbuf.length())
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wbuf.erase(0,n);
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else wbuf.clear();
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} else if (GetLastError() != ERROR_OPERATION_ABORTED)
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break;
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FlushFileBuffers(_sock);
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}
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if (!_run)
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break;
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n = 0;
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if ((!ReadFile(_sock,tmp,sizeof(tmp),&n,NULL))||(n <= 0)) {
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if (GetLastError() == ERROR_OPERATION_ABORTED)
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n = 0;
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else break;
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}
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if (!_run)
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break;
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#else // !__WINDOWS__
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/* So today I learned that there is no reliable way to detect a half-closed
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* Unix domain socket. So to make sure we don't leave orphaned sockets around
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* we just use fucking timeouts. If a socket fucking times out, we break from
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* the I/O loop and terminate the thread. But this IpcConnection code is ugly
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* so maybe the OS is simply offended by it and refuses to reveal its mysteries
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* to me. Oh well... this IPC code will probably get canned when we go to
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* local HTTP RESTful interfaces or soemthing like that. */
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if ((s = _sock) <= 0)
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break;
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&errorfds);
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FD_SET(s,&readfds);
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FD_SET(s,&errorfds);
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tout.tv_sec = _timeout; // use a fucking timeout
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tout.tv_usec = 0;
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if (select(s+1,&readfds,&writefds,&errorfds,&tout) <= 0) {
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break; // socket has fucking timed out
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} else {
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if (FD_ISSET(s,&errorfds))
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break; // socket has an exception... sometimes works
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else {
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n = (int)::read(s,tmp,sizeof(tmp));
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if ((n <= 0)||(_sock <= 0))
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break; // read returned error... sometimes works
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}
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}
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#endif // __WINDOWS__ / !__WINDOWS__
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for(i=0;i<n;++i) {
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c = (linebuf[lineptr] = tmp[i]);
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if ((c == '\r')||(c == '\n')||(c == (char)0)||(lineptr == (sizeof(linebuf) - 1))) {
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if (lineptr) {
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linebuf[lineptr] = (char)0;
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_handler(_arg,this,IPC_EVENT_COMMAND,linebuf);
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lineptr = 0;
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}
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} else ++lineptr;
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}
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}
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_writeLock.lock();
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bool r = _run;
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_writeLock.unlock();
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#ifdef __WINDOWS__
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if (_incoming)
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DisconnectNamedPipe(_sock);
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CloseHandle(_sock);
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_running = false;
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#endif // __WINDOWS__
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if (r)
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_handler(_arg,this,IPC_EVENT_CONNECTION_CLOSED,(const char *)0);
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}
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} // namespace ZeroTier
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