my first real fight with kaffe makes the following problems
1. Incompatible ZipInputStream.getNextEntry()
2. Incompatible CodeSource.toString()
3. Incompatible Permission() constructor
4. Incompatible java.lang.Permission.elements()
5. Incompatible SecurityManager
6. Again: make Kaffe installation moveable on Linux i386 SystemsI tried this with a CVS checkout at
Sam Sep 20 08:07:02 CEST 2003Kind Regards
mle
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Kaffe's ZipInputStream().getNextEntry() throws IOException if
ZipInputStream is invalid, but SUN's Java 1.4.2 returns null;
kaffes way is better and so I adjusted my code:
Object oNextEntry;
try {
oIS = oBootURL.openStream();
oNextEntry = new ZipInputStream(oIS).getNextEntry();
} catch (IOException e2) {
oNextEntry = null;
}
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Kaffe's new CodeSource(oCodeSourceURL, oCerts); implies NullPointer exception
in toString(), if constructed with oCerts == null (and perhaps in other situations),
but SUN's JRE 1.4.2 don't do that.
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Kaffe's new Permission(String s) thrwos execption if called with s="" but SUN's JRE don't.
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In Kaffe gnu.java.security.provider.DefaultPolicy creates instances of java.lang.Permission oPC,
with AllPermissionCollection in oPC.elements(); this Enum don't return PermissionCollections in
SUN's JRE (only Permissions are returned, so I have to collect the Permissions with:
/**
* This method exists for kaffe compatiblilty
*/
private static void copyPermissions(
final PermissionCollection oPC,
final Vector oDest //
) {
final Enumeration oPermEnum = oPC.elements();
while (oPermEnum.hasMoreElements()) {
final Object oPerm = oPermEnum.nextElement();
Log.a.programmerHint(">>>>> All User Permission: " + oPerm);
if (oPerm instanceof Permission) {
oDest.addElement(oPerm);
} else {
if (oPerm instanceof PermissionCollection) {
copyPermissions((PermissionCollection) oPerm,
oDest);
} else {
throw new Neze.Bug("UNexpeced permisision type:
" + oPerm);
}
}
}
}
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I have a "handmade security Mananger and it works everywhere but
not on kaffe, reason: Kaffes java.lang.Securitymanager don't
delegates its check*()-methods to checkPermission(), I verifed this
with a "RMISecurityManager-inspired" KaffeSecurityManager:/* * Created on 20.09.2003 * Copyright http://neze.de 2003 */ package de.neze;
import java.io.FileDescriptor; import java.net.InetAddress; import java.security.Permission;
/**
* @author mle
*/
public class KaffeSecurityManager extends SecurityManager {public KaffeSecurityManager() {
}public void checkAccept(String host, int port) {
}public void checkAccess(Thread g) {
}public void checkAccess(ThreadGroup g) {
}public void checkAwtEventQueueAccess() {
}public void checkConnect(String host, int port) {
}public void checkConnect(String host, int port, Object context) {
}public void checkCreateClassLoader() {
}public void checkDelete(String file) {
}public void checkExec(String cmd) {
}public void checkExit(int status) {
}public void checkLink(String lib) {
}public void checkListen(int port) {
}public void checkMemberAccess ( Class clazz, int which ) {
}public void checkMulticast(InetAddress maddr) {
}public void checkMulticast(InetAddress maddr, byte ttl) {
}public void checkPackageAccess(String pkg) {
}public void checkPackageDefinition(String pkg) {
}public void checkPermission(Permission perm) {
}public void checkPermission(Permission perm, Object context) {
}public void checkPrintJobAccess() {
}public void checkPropertiesAccess() {
}public void checkPropertyAccess(String key) {
}/* public void checkPropertyAccess(String key, String def) {
}*/public void checkRead(FileDescriptor fd) {
}public void checkRead(String file) {
}public void checkRead(String file, Object context) {
}public void checkSecurityAccess(String action) {
}public void checkSetFactory() {
}public void checkSystemClipboardAccess() {
}public boolean checkTopLevelWindow(Object window) {
return (true);
}public void checkWrite(FileDescriptor fd) {
}public void checkWrite(String file) {
}} -------------------------------------------------------------------------
Perhaps somebody is intressted on a solution to the "Moveable Kaffe installation"-Problem there are two possiblities and the first one is shorter then this mail:
(1) Modify the scirpts in the INSTDIR of kaffe:
$INSTDIR/kaffe-1.1.1/kaffe/scripts
each script starts with prefix
...
prefix="@prefix@"
exec_prefix="@exec_prefix@"
...I suggest to modify this lines to
...
prefix="@prefix@"
exec_prefix="@exec_prefix@"
...
scriptpath_to_root=".."
. $(dirname $0)/prefix_calculator $0 $scriptpath_to_rootin the included bash script you can adjust the variables
prefix
exec_prefixwith the "real" prefixes calculated based on the location of the "scriptpath_to_root" and the location of the script $0 and the user-changed configuration ofthe prefixes; useful bash function are perhaps (from my evm-wrapper of Zaurus):
#
# funcFollowlink()
#
funcFollowlink() {
local TARGET=$1
# if we are called by symlink, follow it to its target
while test -L "$TARGET" ; do
# keep dir where the symlink is
local DIR=$($DIRNAME "$TARGET")
# ask ls -l about the symlink's target
local LL_OUT=$($LS -l "$TARGET")
TARGET=$($EXPR "$LL_OUT" : '.*-> \(.*\)')
# for relative target, prefix with dir of symlink
local ABS=$($EXPR "$TARGET" : '/.*')
if test "$ABS" -eq 0 ; then
TARGET="$DIR/$TARGET"
fi
done
echo "$TARGET"
}
#
# funcCanonicalFileName
#
funcCanonicalFileName() {
local varFile=$1
if test -e $varFile ; then
varFile=$(funcFollowlink $1)
# else
# echo "Warning: Calculate canonical file name not existing" >&2
fi
varPWD=$(pwd)
if test -d $varFile ; then
cd $varFile
varFile=$(pwd)
else
cd $($DIRNAME $varFile)
varFile=$(pwd)/$($BASENAME $varFile)
fi
cd $varPWD
echo "$varFile"
}As a result you have to add 2 lines of code to each wrapper script, and you have to write the file prefix_calculator which may have 100 lines or so.
(2) C-Link and (Additional) Wrapper:
A better solution of course is to write a "C-link" i.e. very small
C-programm which compiles (on windows to 4 kb - I send you Win32
implemtation if you like it).
This programm calls a monster-wrapper as your kaffe-bin:
monster-wrapper absolute-scriptpath scritp-arguments.
I think that is a much better solution then bash scirpts as the first
lines of my Zaurus script proves (perhaps a better prove is a
document realted to autoconf, which explains on many lines how to
write compatibe shell script -- short version: it is impossible) if [ -e /bin/busybox ] ; then
# Zaurus case
export DIRNAME="busybox dirname"
export BASENAME="busybox basename"
export EXPR="expr"
export LS="busybox ls"
else
# Linux case
export DIRNAME=dirname
export BASENAME=basename
export EXPR=expr
export LS=ls
fi(3) Hint unrealted to moveable installation
Another suggestion is: Don't use softlinks in your kaffe installations, as IBM does with its JDK 1.4.1, this makes it not installable on Smartcard with FAT file system, and I like to do that: I have a application launchable form USB-stick Sandisk curiser (256MB) with SUN JDK for Linux and Qindows and my application runs from this smartcard on linux, windows and zaurus (and if I become rich some day, I buy a WinCE device ... :-<). IBM's JDK is not useable for that purpose :-(.
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