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/**
* @file llasynchostbyname.cpp
* @brief Wrapper for Windows asychronous DNS lookup functionality
*
* Copyright (c) 2003-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
// standard LL includes
#include "llviewerprecompiledheaders.h"
// self include
#include "llasynchostbyname.h"
//
// Globals
//
LLAsyncHostByName gAsyncHostByName;
//
// Parallel implementations for Windows/UNIX!
//
#if LL_WINDOWS
#include "llviewerwindow.h"
// Place to register the Windows callback
extern void (*gAsyncMsgCallback)(const MSG &msg);
// member functions
LLAsyncHostByName::LLAsyncHostByName()
:
mRequestHandle(0),
mCallback(NULL),
mUserdata(NULL)
{
gAsyncMsgCallback = LLAsyncHostByName::handleMessageCallback;
memset(mOutputBuffer, 0, sizeof( mOutputBuffer ) );
}
LLAsyncHostByName::~LLAsyncHostByName()
{
}
BOOL LLAsyncHostByName::startRequest( const LLString& domain_name, LLAsyncHostByNameCallback callback, void* userdata )
{
if( isPendingRequest() )
{
llwarns << "LLAsyncHostByName::startRequest() cancelled existing request." << llendl;
cancelPendingRequest();
}
mCallback = callback;
mUserdata = userdata;
memset(mOutputBuffer, 0, sizeof( mOutputBuffer ) );
mDomainName = domain_name;
mRequestHandle = WSAAsyncGetHostByName(
(HWND)gViewerWindow->getPlatformWindow(),
LL_WM_HOST_RESOLVED,
domain_name.c_str(),
mOutputBuffer,
sizeof( mOutputBuffer ) );
if( !mRequestHandle )
{
llwarns << "LLAsyncHostByName::startRequest() failed: " << WSAGetLastError() << llendl;
return FALSE;
}
return TRUE;
}
void LLAsyncHostByName::handleMessage( const MSG& msg )
{
if( (HANDLE)msg.wParam != mRequestHandle )
{
llwarns << "LL_WM_HOST_RESOLVED received for request we weren't waiting for. Ignored." << llendl;
return;
}
llinfos << "LL_WM_HOST_RESOLVED" << llendl;
BOOL success = FALSE;
U32 ip = 0;
S32 error = WSAGETASYNCERROR( msg.lParam );
if( error )
{
if( error == WSANO_DATA)
{
llwarns << "Unknown host" << llendl;
}
else
{
llwarns << "Resolve host error" << WSAGetLastError () << llendl;
}
}
else
{
HOSTENT* he = (HOSTENT*) mOutputBuffer;
char** addr_list = he->h_addr_list;
if (!addr_list)
{
llwarns << "Bad HOSTENT in LLAsyncHostByName" << llendl;
return;
}
char* first_addr = addr_list[0];
if (!first_addr)
{
llwarns << "Bad address in HOSTENT in LLAsyncHostByName" << llendl;
return;
}
ip = *(U32*)first_addr;
success = TRUE;
}
if( mCallback )
{
mCallback( success, mDomainName, ip, mUserdata );
}
mCallback = NULL;
mUserdata = NULL;
mRequestHandle = 0;
mDomainName.clear();
}
BOOL LLAsyncHostByName::cancelPendingRequest()
{
if( mCallback )
{
mCallback( FALSE, mDomainName, 0, mUserdata );
}
mUserdata = NULL;
mCallback = NULL;
if( mRequestHandle )
{
S32 ret = WSACancelAsyncRequest( mRequestHandle );
if( SOCKET_ERROR == ret )
{
llwarns << "LLAsyncHostByName::cancelPendingRequest() failed: " << WSAGetLastError() << llendl;
return FALSE;
}
memset(mOutputBuffer, 0, sizeof( mOutputBuffer ) );
mRequestHandle = 0;
return TRUE;
}
return FALSE;
}
// static
void LLAsyncHostByName::handleMessageCallback(const MSG& msg)
{
gAsyncHostByName.handleMessage(msg);
}
#else // !LL_WINDOWS
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
// member functions
LLAsyncHostByName::LLAsyncHostByName()
{
}
LLAsyncHostByName::~LLAsyncHostByName()
{
}
BOOL LLAsyncHostByName::startRequest( const LLString& domain_name, LLAsyncHostByNameCallback callback, void* userdata )
{
struct hostent *response;
U32 ip;
BOOL result = FALSE;
response = gethostbyname(domain_name.c_str());
if(response != NULL)
{
if(response->h_addrtype == AF_INET)
{
ip = ((struct in_addr*)response->h_addr_list[0])->s_addr;
result = TRUE;
(*callback)(result, domain_name, ip, userdata);
}
}
return result;
}
BOOL LLAsyncHostByName::cancelPendingRequest()
{
// Since this implementation is synchronous, there's nothing to do here.
return TRUE;
}
#endif // !LL_WINDOWS
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