public MSSqlServerInfo(String host) throws SQLException {
try {
InetAddress addr = InetAddress.getByName(host);
DatagramSocket socket = new DatagramSocket();
byte[] msg = new byte[] {0x02};
DatagramPacket p = new DatagramPacket(msg, msg.length, addr, 1434);
socket.send(p);
byte[] buf = new byte[4096];
p = new DatagramPacket(buf, buf.length);
socket.setSoTimeout(m_timeout);
for (int i = 0; i < m_numRetries; i++) {
try {
socket.receive(p);
String infoString = extractString(buf, p.getLength());
m_serverInfoStrings = split(infoString, ';');
return;
} catch (InterruptedIOException toEx) {
}
}
} catch (Exception e) {
// Ignore...
}
throw new SQLException(Messages.get("error.msinfo.badinfo", host), "HY000");
}
/**
* Call getInfo() before calling this method. It parses the info string returned from SQL Server
* and looks for the port for the given named instance. If it can't be found, or if getInfo()
* hadsn't been called, it returns -1.
*
* @param instanceName
* @return port the given instance is listening on, or -1 if it can't be found.
*/
public int getPortForInstance(String instanceName) throws SQLException {
if (m_serverInfoStrings == null) {
return -1;
}
// NOTE: default instance is called MSSQLSERVER
if (instanceName == null || instanceName.length() == 0) {
instanceName = "MSSQLSERVER";
}
String curInstance = null;
String curPort = null;
for (int index = 0; index < m_serverInfoStrings.length; index++) {
if (m_serverInfoStrings[index].length() == 0) {
curInstance = null;
curPort = null;
} else {
String key = m_serverInfoStrings[index];
String value = "";
index++;
if (index < m_serverInfoStrings.length) {
value = m_serverInfoStrings[index];
}
if (key.equals("InstanceName")) {
curInstance = value;
}
if (key.equals("tcp")) {
curPort = value;
}
if (curInstance != null && curPort != null && curInstance.equalsIgnoreCase(instanceName)) {
try {
return Integer.parseInt(curPort);
} catch (NumberFormatException e) {
throw new SQLException(Messages.get("error.msinfo.badport", instanceName), "HY000");
}
}
}
}
// didn't find it...
return -1;
}