QSQLOLEDB/OLEDBManager.cpp at main · wrizen/QSQLOLEDB · GitHub

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/****************************************************************************
** QSQLOLEDB - Qt OLE DB Driver Plugin for Microsoft SQL Server
**
** Copyright (c) 2025 qsqloledb contributors
** Licensed under the MIT License. See LICENSE file for details.
****************************************************************************/
#include "stdafx.h"
#include "OLEDBManager.h"


Q_GLOBAL_STATIC(OLEDBManager, oledbManager)

OLEDBManager::OLEDBManager()
{
	WSADATA wsa;
	WSAStartup(MAKEWORD(2, 2), &wsa);
}

OLEDBManager::~OLEDBManager()
{
	WSACleanup();
}

OLEDBManager* OLEDBManager::instance()
{
	return oledbManager();
}

bool OLEDBManager::isConnect(const QString &host, int port)
{
	QRegExp exp("^(.*)\\\\(\\w+)$");
	QString realHost = host;
	QString instanceName;
	if (exp.exactMatch(host))
	{
		realHost = exp.cap(1);
		instanceName = exp.cap(2);
	}
	if (port <= 0)
	{
		QString queryName = instanceName.isEmpty()
			? QStringLiteral("MSSQLSERVER")
			: instanceName;
		int browserPort = queryBrowserForPort(realHost, queryName);
		if (browserPort > 0)
			port = browserPort;
		else if (instanceName.isEmpty())
			port = 1433;
		else
			return false;
	}

	SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock == INVALID_SOCKET)
		return false;

	u_long mode = 1;
	ioctlsocket(sock, FIONBIO, &mode);

	struct sockaddr_in server;
	server.sin_family = AF_INET;
	server.sin_port = htons(port);
	server.sin_addr.s_addr = inet_addr(realHost.toLatin1());

	int result = ::connect(sock, (struct sockaddr*)&server, sizeof(server));
	bool isConnected = false;

	if (result == SOCKET_ERROR)
	{
		if (WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINPROGRESS)
		{
			fd_set writefds;
			FD_ZERO(&writefds);
			FD_SET(sock, &writefds);

			struct timeval timeout;
			timeout.tv_sec = 0;
			timeout.tv_usec = 500000;

			result = select(0, NULL, &writefds, NULL, &timeout);
			if (result > 0)
				isConnected = true;
		}
	}

	closesocket(sock);
	return isConnected;
}

int OLEDBManager::queryBrowserForPort(const QString &host, const QString &instanceName)
{
	SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sock == INVALID_SOCKET)
		return -1;

	struct sockaddr_in browserAddr;
	browserAddr.sin_family = AF_INET;
	browserAddr.sin_port = htons(1434);
	browserAddr.sin_addr.s_addr = inet_addr(host.toLatin1());

	// SQL Server Browser protocol: 0x04 + instance name (null-terminated)
	QByteArray request;
	request.append('\x04');
	request.append(instanceName.toUtf8());
	request.append('\0');

	u_long mode = 1;
	ioctlsocket(sock, FIONBIO, &mode);

	sendto(sock, request.constData(), request.size(), 0,
		(struct sockaddr*)&browserAddr, sizeof(browserAddr));

	fd_set readfds;
	FD_ZERO(&readfds);
	FD_SET(sock, &readfds);

	struct timeval timeout;
	timeout.tv_sec = 0;
	timeout.tv_usec = 500000;

	int port = -1;
	int result = select(0, &readfds, NULL, NULL, &timeout);
	if (result > 0)
	{
		char buffer[4096];
		int received = recvfrom(sock, buffer, sizeof(buffer) - 1, 0, NULL, NULL);
		if (received > 3)
		{
			buffer[received] = '\0';
			// Response: 3-byte header + "ServerName;...;tcp;PORT;..." semicolon-delimited
			QString response = QString::fromLatin1(buffer + 3, received - 3);
			QStringList parts = response.split(';');
			for (int i = 0; i < parts.count() - 1; i++)
			{
				if (parts[i].toLower() == "tcp")
				{
					port = parts[i + 1].toInt();
					break;
				}
			}
		}
	}

	closesocket(sock);
	return port;
}