/**
* Reads the next operation code. Skips all {@link
* org.firebirdsql.gds.impl.wire.WireProtocolConstants#op_dummy} codes received.
*
* @return Operation code
* @throws IOException if an error occurs while reading from the underlying InputStream
*/
public final int readNextOperation() throws IOException {
int op;
do {
op = xdrIn.readInt();
} while (op == op_dummy);
return op;
}
/**
* Performs the connection identification phase of the Wire protocol and returns the
* FbWireDatabase implementation for the agreed protocol.
*
* @return FbWireDatabase
* @throws SQLTimeoutException
* @throws SQLException
*/
@Override
public final C identify() throws SQLException {
try {
xdrIn = new XdrInputStream(socket.getInputStream());
xdrOut = new XdrOutputStream(socket.getOutputStream());
// Here we identify the user to the engine.
// This may or may not be used as login info to a database.
final byte[] userBytes = getSystemUserName().getBytes();
final byte[] hostBytes = getSystemHostName().getBytes();
ByteArrayOutputStream userId = new ByteArrayOutputStream();
userId.write(CNCT_user);
int userLength = Math.min(userBytes.length, 255);
userId.write(userLength);
userId.write(userBytes, 0, userLength);
userId.write(CNCT_host);
int hostLength = Math.min(hostBytes.length, 255);
userId.write(hostLength);
userId.write(hostBytes, 0, hostLength);
userId.write(CNCT_user_verification);
userId.write(0);
xdrOut.writeInt(op_connect);
xdrOut.writeInt(op_attach);
xdrOut.writeInt(CONNECT_VERSION2);
xdrOut.writeInt(arch_generic);
xdrOut.writeString(getAttachObjectName(), getEncoding());
xdrOut.writeInt(protocols.getProtocolCount()); // Count of protocols understood
xdrOut.writeBuffer(userId.toByteArray());
for (ProtocolDescriptor protocol : protocols) {
xdrOut.writeInt(protocol.getVersion()); // Protocol version
xdrOut.writeInt(protocol.getArchitecture()); // Architecture of client
xdrOut.writeInt(protocol.getMinimumType()); // Minimum type
xdrOut.writeInt(protocol.getMaximumType()); // Maximum type
xdrOut.writeInt(protocol.getWeight()); // Preference weight
}
xdrOut.flush();
if (readNextOperation() == op_accept) {
protocolVersion = xdrIn.readInt(); // Protocol version
protocolArchitecture = xdrIn.readInt(); // Architecture for protocol
protocolMinimumType = xdrIn.readInt(); // Minimum type
if (protocolVersion < 0) {
protocolVersion = (protocolVersion & FB_PROTOCOL_MASK) | FB_PROTOCOL_FLAG;
}
ProtocolDescriptor descriptor = protocols.getProtocolDescriptor(protocolVersion);
if (descriptor == null) {
throw new SQLException(
String.format(
"Unsupported or unexpected protocol version %d connecting to database %s. Supported version(s): %s",
protocolVersion, getServerName(), protocols.getProtocolVersions()));
}
return createConnectionHandle(descriptor);
} else {
try {
close();
} catch (Exception ex) {
log.debug("Ignoring exception on disconnect in connect phase of protocol", ex);
}
throw new FbExceptionBuilder().exception(ISCConstants.isc_connect_reject).toSQLException();
}
} catch (SocketTimeoutException ste) {
throw new FbExceptionBuilder()
.timeoutException(ISCConstants.isc_network_error)
.messageParameter(getServerName())
.cause(ste)
.toSQLException();
} catch (IOException ioex) {
throw new FbExceptionBuilder()
.exception(ISCConstants.isc_network_error)
.messageParameter(getServerName())
.cause(ioex)
.toSQLException();
}
}