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/*==LICENSE==*
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CyanWorlds.com Engine - MMOG client, server and tools
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Copyright (C) 2011 Cyan Worlds, Inc.
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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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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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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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Additional permissions under GNU GPL version 3 section 7
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If you modify this Program, or any covered work, by linking or
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
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(or a modified version of those libraries),
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
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licensors of this Program grant you additional
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permission to convey the resulting work. Corresponding Source for a
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non-source form of such a combination shall include the source code for
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
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work.
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
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or by snail mail at:
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Cyan Worlds, Inc.
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14617 N Newport Hwy
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Mead, WA 99021
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*==LICENSE==*/
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/*****************************************************************************
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*
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* $/Plasma20/Sources/Plasma/NucleusLib/pnAsyncCoreExe/Private/Win32/pnAceW32Dns.cpp
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*
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***/
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#include "../../Pch.h"
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#pragma hdrstop
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/*****************************************************************************
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*
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* Private
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*
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***/
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enum {
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WM_LOOKUP_EXIT = WM_APP,
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WM_LOOKUP_FOUND_HOST
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};
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const unsigned kMaxLookupName = 128;
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struct Lookup {
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LINK(Lookup) link;
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AsyncCancelId cancelId;
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HANDLE cancelHandle;
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FAsyncLookupProc lookupProc;
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unsigned port;
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void * param;
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char name[kMaxLookupName];
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char buffer[MAXGETHOSTSTRUCT];
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};
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static CCritSect s_critsect;
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static LISTDECL(Lookup, link) s_lookupList;
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static HANDLE s_lookupThread;
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static HWND s_lookupWindow;
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static unsigned s_nextLookupCancelId = 1;
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/*****************************************************************************
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*
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* Internal functions
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*
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***/
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//===========================================================================
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static void LookupProcess (Lookup * lookup, unsigned error) {
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if (error)
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return;
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const HOSTENT & host = * (HOSTENT *) lookup->buffer;
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if (host.h_addrtype != AF_INET)
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return;
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if (host.h_length != sizeof(in_addr))
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return;
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if (!host.h_addr_list)
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return;
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in_addr const * const * const inAddr = (in_addr **) host.h_addr_list;
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// allocate a buffer large enough to hold all the addresses
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size_t count = arrsize(inAddr);
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plNetAddress* addrs = new plNetAddress[count];
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// fill in address data
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for (size_t i = 0; i < count; ++i) {
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addrs[i].SetHost(inAddr[i]->S_un.S_addr);
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addrs[i].SetPort(lookup->port);
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}
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if (host.h_name && host.h_name[0])
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strncpy(lookup->name, host.h_name, arrsize(lookup->name));
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if (lookup->lookupProc)
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lookup->lookupProc(lookup->param, lookup->name, count, addrs);
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// we can delete the operation outside an IoConn critical
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// section because it isn't linked into an ioConn opList
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// and because connection attempts are not waitable
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ASSERT(!lookup->link.IsLinked());
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delete lookup;
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PerfSubCounter(kAsyncPerfNameLookupAttemptsCurr, 1);
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delete[] addrs;
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}
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//===========================================================================
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static void LookupFindAndProcess (HANDLE cancelHandle, unsigned error) {
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// find the operation for this cancel handle
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Lookup * lookup;
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s_critsect.Enter();
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for (lookup = s_lookupList.Head(); lookup; lookup = s_lookupList.Next(lookup)) {
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if (lookup->cancelHandle == cancelHandle) {
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lookup->cancelHandle = nil;
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s_lookupList.Unlink(lookup);
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break;
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}
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}
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s_critsect.Leave();
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if (lookup)
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LookupProcess(lookup, error);
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}
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//===========================================================================
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static unsigned THREADCALL LookupThreadProc (AsyncThread * thread) {
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static const char WINDOW_CLASS[] = "AsyncLookupWnd";
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WNDCLASS wc;
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memset(&wc, 0, sizeof(wc));
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wc.lpfnWndProc = DefWindowProc;
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wc.hInstance = GetModuleHandle(0);
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wc.lpszClassName = WINDOW_CLASS;
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RegisterClass(&wc);
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s_lookupWindow = CreateWindow(
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WINDOW_CLASS,
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WINDOW_CLASS,
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WS_OVERLAPPED,
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CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
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(HWND)0,
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(HMENU) 0,
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wc.hInstance,
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0
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);
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if (!s_lookupWindow)
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ErrorAssert(__LINE__, __FILE__, "CreateWindow %#x", GetLastError());
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HANDLE lookupStartEvent = (HANDLE) thread->argument;
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SetEvent(lookupStartEvent);
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MSG msg;
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while (GetMessage(&msg, s_lookupWindow, 0, 0)) {
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if (msg.message == WM_LOOKUP_FOUND_HOST)
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LookupFindAndProcess((HANDLE) msg.wParam, HIWORD(msg.lParam));
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else if (msg.message == WM_LOOKUP_EXIT)
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break;
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else {
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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// fail all pending name lookups
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for (;;) {
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s_critsect.Enter();
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Lookup * lookup = s_lookupList.Head();
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if (lookup) {
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WSACancelAsyncRequest(lookup->cancelHandle);
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lookup->cancelHandle = nil;
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s_lookupList.Unlink(lookup);
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}
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s_critsect.Leave();
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if (!lookup)
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break;
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LookupProcess(lookup, (unsigned) -1);
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}
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// cleanup
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DestroyWindow(s_lookupWindow);
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s_lookupWindow = nil;
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return 0;
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}
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//===========================================================================
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static void StartLookupThread () {
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if (s_lookupThread)
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return;
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// create a shutdown event
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HANDLE lookupStartEvent = CreateEvent(
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(LPSECURITY_ATTRIBUTES) 0,
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true, // manual reset
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false, // initial state off
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(LPCTSTR) 0 // name
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);
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if (!lookupStartEvent)
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ErrorAssert(__LINE__, __FILE__, "CreateEvent %#x", GetLastError());
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// create a thread to perform lookups
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s_lookupThread = (HANDLE) AsyncThreadCreate(
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LookupThreadProc,
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lookupStartEvent,
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L"AsyncLookupThread"
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);
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WaitForSingleObject(lookupStartEvent, INFINITE);
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CloseHandle(lookupStartEvent);
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ASSERT(s_lookupWindow);
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}
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/*****************************************************************************
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*
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* Module functions
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*
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***/
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//===========================================================================
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void DnsDestroy (unsigned exitThreadWaitMs) {
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if (s_lookupThread) {
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PostMessage(s_lookupWindow, WM_LOOKUP_EXIT, 0, 0);
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WaitForSingleObject(s_lookupThread, exitThreadWaitMs);
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CloseHandle(s_lookupThread);
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s_lookupThread = nil;
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ASSERT(!s_lookupWindow);
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}
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}
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/*****************************************************************************
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*
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* Public functions
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*
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***/
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//===========================================================================
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void AsyncAddressLookupName (
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AsyncCancelId * cancelId, // out
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FAsyncLookupProc lookupProc,
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const char* name,
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unsigned port,
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void * param
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) {
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ASSERT(lookupProc);
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ASSERT(name);
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PerfAddCounter(kAsyncPerfNameLookupAttemptsCurr, 1);
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PerfAddCounter(kAsyncPerfNameLookupAttemptsTotal, 1);
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// Get name/port
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char* ansiName = strdup(name);
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if (char* portStr = StrChr(ansiName, ':')) {
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if (unsigned newPort = StrToUnsigned(portStr + 1, nil, 10))
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port = newPort;
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*portStr = 0;
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}
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// Initialize lookup
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Lookup * lookup = new Lookup;
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lookup->lookupProc = lookupProc;
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lookup->port = port;
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lookup->param = param;
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strncpy(lookup->name, name, arrsize(lookup->name));
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s_critsect.Enter();
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{
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// Start the lookup thread if it wasn't started already
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StartLookupThread();
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s_lookupList.Link(lookup);
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// get cancel id; we can avoid checking for zero by always using an odd number
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ASSERT(s_nextLookupCancelId & 1);
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s_nextLookupCancelId += 2;
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*cancelId = lookup->cancelId = (AsyncCancelId) s_nextLookupCancelId;
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// Perform async lookup
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lookup->cancelHandle = WSAAsyncGetHostByName(
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s_lookupWindow,
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WM_LOOKUP_FOUND_HOST,
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name,
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&lookup->buffer[0],
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sizeof(lookup->buffer)
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);
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if (!lookup->cancelHandle) {
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PostMessage(s_lookupWindow, WM_LOOKUP_FOUND_HOST, nil, (unsigned) -1);
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}
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}
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s_critsect.Leave();
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}
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//===========================================================================
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void AsyncAddressLookupAddr (
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AsyncCancelId * cancelId, // out
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FAsyncLookupProc lookupProc,
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const plNetAddress& address,
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void * param
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) {
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ASSERT(lookupProc);
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PerfAddCounter(kAsyncPerfNameLookupAttemptsCurr, 1);
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PerfAddCounter(kAsyncPerfNameLookupAttemptsTotal, 1);
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// Initialize lookup
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Lookup * lookup = new Lookup;
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lookup->lookupProc = lookupProc;
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lookup->port = 1;
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lookup->param = param;
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plString str = address.GetHostString();
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strncpy(lookup->name, str.c_str(), arrsize(lookup->name));
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s_critsect.Enter();
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{
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// Start the lookup thread if it wasn't started already
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StartLookupThread();
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s_lookupList.Link(lookup);
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// get cancel id; we can avoid checking for zero by always using an odd number
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ASSERT(s_nextLookupCancelId & 1);
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s_nextLookupCancelId += 2;
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*cancelId = lookup->cancelId = (AsyncCancelId) s_nextLookupCancelId;
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// Perform async lookup
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u_long addr = ((const sockaddr_in *) &address)->sin_addr.S_un.S_addr;
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lookup->cancelHandle = WSAAsyncGetHostByAddr(
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s_lookupWindow,
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WM_LOOKUP_FOUND_HOST,
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(const char *) &addr,
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sizeof(addr),
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AF_INET,
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&lookup->buffer[0],
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sizeof(lookup->buffer)
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);
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if (!lookup->cancelHandle) {
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PostMessage(s_lookupWindow, WM_LOOKUP_FOUND_HOST, nil, (unsigned) -1);
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}
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}
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s_critsect.Leave();
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}
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//===========================================================================
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void AsyncAddressLookupCancel (
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FAsyncLookupProc lookupProc,
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AsyncCancelId cancelId // nil = cancel all with specified lookupProc
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) {
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s_critsect.Enter();
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for (Lookup * lookup = s_lookupList.Head(); lookup; lookup = s_lookupList.Next(lookup)) {
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if (lookup->lookupProc && (lookup->lookupProc != lookupProc))
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continue;
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if (cancelId && (lookup->cancelId != cancelId))
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continue;
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if (!lookup->cancelHandle)
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continue;
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// cancel this request
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WSACancelAsyncRequest(lookup->cancelHandle);
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lookup->cancelHandle = nil;
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// initiate user callback
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PostMessage(s_lookupWindow, WM_LOOKUP_FOUND_HOST, nil, (unsigned) -1);
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}
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s_critsect.Leave();
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}
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