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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.rte.comm;
import java.util.StringTokenizer;
import com.sap.dbtech.util.StructuredBytes;
/**
* the layout used by SQL packets.
*/
class DbPacketLayout implements com.sap.dbtech.rte.comm.PacketLayout {
private int maxDataLength;
private int maxSegmentSize;
private int minReplySize;
private int packetSize;
private int portNumber;
private boolean supportsChallengeResponse = false;
public static final int safePacketSizeC = 0; //Integer.MAX_VALUE;
/**
* creates a new DbpacketLayout with dummy sizes.
*/
DbPacketLayout ()
{
// this (Short.MAX_VALUE, Short.MAX_VALUE, -1, 0);
this (safePacketSizeC, 1024 * 32, 0, safePacketSizeC);
}
/**
* create a new DbPacketLayout.
*/
DbPacketLayout (
int maxData,
int maxSegment,
int minReply,
int packetS
)
{
this.maxDataLength = maxData;
this.maxSegmentSize = maxSegment;
this.minReplySize = minReply;
this.packetSize = packetS;
}
DbPacketLayout (
StructuredBytes reply,
boolean trustReply,
boolean parseVarData
)
{
getPacketLayoutFromReply (reply, trustReply, parseVarData);
}
/**
*
*/
public void
dumpOn (
java.io.PrintStream out,
String comment)
{
out.println ("DbPacketLayout: " + comment);
out.println (" packetSize: " + this.packetSize);
out.println (" maxSegmentSize: " + this.maxSegmentSize);
out.println (" maxDataLength: " + this.maxDataLength);
out.println (" minReplySize: " + this.minReplySize);
}
/**
* the maximal size of a command the client can send to the server.
* @return int
*/
public int maxCmdDataLength () {
return this.maxDataLength () - this.minReplySize ();
}
/**
* the maximal size of request + reply
*/
public int maxDataLength() {
return maxDataLength;
}
/**
* the maximal size of the whole packet (including RTE data)
*/
public int maxSegmentSize() {
// return maxSegmentSize;
return this.maxSegmentSize;
}
/**
* the minimal size of a reply.
*/
public int minReplySize() {
return minReplySize;
}
/**
*
*/
public int packetSize() {
return packetSize;
}
public boolean isChallengeResponseSupported() {
return supportsChallengeResponse;
}
private void
getPacketLayoutFromReply (
StructuredBytes reply,
boolean trustReply,
boolean parseVarData)
{
this.maxDataLength = reply.getInt4 (RteC.Header_END_O_C + RteC.Connect_MaxDataLen_O);
this.minReplySize = reply.getInt4 (RteC.Header_END_O_C + RteC.Connect_MinReplySize_O);
this.packetSize = reply.getInt4 (RteC.Header_END_O_C + RteC.Connect_PacketSize_O);
if (trustReply) {
this.maxSegmentSize = reply.getInt4 (RteC.Header_END_O_C + RteC.Connect_MaxSegmentSize_O);
}
else {
this.maxSegmentSize = packetSize;
}
// Sanity checks that prevent garbled replies from the x_server
// to do any harm
/*
if( (packetSize < 16384) // lower limit of packet size is 16384
|| (maxDataLen <= packetSize) // maxDataLength is always greater
|| (packetSize > 500 * 1024) // upper limit of packet size
) {
throw new RTEException (MessageTranslator.translate(MessageKey.ERROR_REPLY_GARBLED),
RteC.CommunicationErrorCodeMap_C[RteC.SQLRECEIVE_LINE_DOWN_C]);
}
*/
if (parseVarData){
this.parseVardataPart(reply);
}
}
private void parseVardataPart (StructuredBytes reply) {
boolean forceReconnect = false;
int vardataOffest = RteC.Header_END_O_C + RteC.Connect_VarPart_O;
int vardataLen = reply.bytes().length - vardataOffest;
for (int pos = vardataOffest; pos < vardataLen; ){
int len = reply.getInt1(pos);
if (len <= 0) break;
switch ((char)reply.getInt1(pos+1)) {
case RteC.ARGID_PORT_NO_C:{
//always not swapped
int lowerByte = reply.getInt1(pos+3);
if (lowerByte < 0) {
lowerByte += 256;
}
this.portNumber = (reply.getInt1(pos+2) * 256) + lowerByte;
break;
}
case RteC.ARGID_AUTH_ALLOW_C:{
String auth = reply.getString(pos+2,len-3);
StringTokenizer st = new StringTokenizer(auth,",");
while (st.hasMoreTokens()){
if (st.nextToken().equals("SCRAMMD5")){
this.supportsChallengeResponse = true;
break;
}
}
break;
}
default:
break;
}
// System.out.println("Vardata Type: "+ reply.getString(pos+1,1)+ " Value: "+ Tracer.Hex2String(reply.getBytes(pos+2,len-2)));
pos += len;
}
}
public int getPortNumber() {
return portNumber;
}
}
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