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Docker, an advanced chroot utility

Fri, 11/29/2019 - 18:09 —

As we are helping various customers we encounter new technologies.

In the old days, we used chroot to create a separate environment where you could have your own installation and prevent the software from within that environment from accessing everything on your computer. This is particularly useful for publicly facing services.

However, chroot is difficult to setup properly. You need to have all the necessary libraries installed, for example.

Docker takes that technology to the next level by hiding all the complicated setup as it takes care of it for you. It will create an environment ...

Brief Overview of CRISC Certification Exam

Sat, 06/23/2018 - 13:08 —

The CRISC, also known as Certified in Risk and Information Systems Control, is a vendor-neutral certification that validates a professional’s knowledge and experience in the fields of information system control & risk management. The certificate is developed and administered by ISACA and designed for the individuals who work with organizations in mitigating business risks and implement information system controls.

Organizations in today’s world must consistently enhance their infrastructure so that they can survive and thrive in today’s competitive environment. It is a ...

Set Target (dynamic)

SWF Action
Action Category: 
Movie
Action Details: 
(dynamic)
Action Identifier: 
32
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (s)
Action Operation: 
s1 := pop();
set_target(s1);
Action Flash Version: 
3
See Also: 
Call Method
DefineSprite
Get Member
Set Member
Set Target

Pop one string from the stack. If the string is the empty string, then the next actions apply to the main movie. Otherwise it is the name of a Sprite1 and the followings actions apply to that Sprite only.

  • 1. Note that the name of a sprite is specified in the PlaceObject2 tag so as to be able to include the same DefineSprite tag multiple times and still be able to distinguish each instance.

With

SWF Action
Action Category: 
Control
Action Details: 
0
Action Identifier: 
148
Action Structure: 
unsigned short   f_size;
Action Length: 
2 byte(s)
Action Stack: 
pop 1 (o)
Action Operation: 
with o1
  // execute f_size bytes of actions
  ...
end with;
Action Flash Version: 
5
See Also: 
Set Target
Set Target (dynamic)

The variable references within the following f_size bytes of action are taken as names of members of the specified object o1. When no member of that name is available in that object, the previous With, or the corresponding global variable is queried. This is similar to the Pascal language with instruction or to the Set Target (dynamic) for movies.

Toggle Quality

SWF Action
Action Category: 
Movie
Action Details: 
0
Action Identifier: 
8
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
n.a.
Action Operation: 
if (_root.quality == HIGH_QUALITY) {
  _root.set_quality(LOW_QUALITY);
}
else {
  _root.set_quality(HIGH_QUALITY);
}
Action Flash Version: 
1
See Also: 
Get Member
Get Property
Set Member
Set Property

Change the quality level from low to high and vice versa. At this time, not sure what happens if you use medium!

Note that the quality is defined on the root only and affects the entire output.

Newer SWF versions (since version 5) should use the movie quality variable member instead of this direct action.

Set Target

SWF Action
Action Category: 
Movie
Action Details: 
(dynamic)
Action Identifier: 
139
Action Structure: 
string   f_target;
Action Length: 
-1 byte(s)
Action Stack: 
n.a.
Action Operation: 
set_target(f_target);
Action Flash Version: 
1
See Also: 
Call Method
DefineSprite
Get Member
Set Member
Set Target (dynamic)

If the string f_target is the empty string, then the next actions apply to the main movie.

Otherwise it is the name of a Sprite and the followings actions apply to that Sprite only.

In order to use a dynamic name for the target, use Set Target (dynamic) instead.

Set Member

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
79
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (a), pop 1 (o)
Action Operation: 
a1 := pop();
a2 := pop();
o3 := pop();
o3[a2] = a1;
Action Flash Version: 
5
See Also: 
Get Member
Get Property
Set Property
Call Method

Pop a value a1 representing the new member value.

Pop one string or integer a2 representing the name of the member to modified or create.

Finally, pop an object reference o3.

If the member a2 doesn't exists yet, create it.

Finally, sets the object member a2 to the value a1.

Random

SWF Action
Action Category: 
Arithmetic
Action Details: 
0
Action Identifier: 
48
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (n), push 1 (i)
Action Operation: 
n1 := pop();
r := random(n1);
push(r);
Action Flash Version: 
4
See Also: 
Integral Part

Pop one number representing the maximum value (not included) that the random() function can return, push the generated value on the stack. n1 should not be zero or negative.

Since version 5, you should use the Math.rand() member function instead of this action.

New

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
64
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (s), pop 1 (i), pop i2 (a)
Action Operation: 
s1 := pop();
i2 := pop();
for(idx := 3; idx <= i2 + 2; ++idx) {
  aidx := pop();
}
o := new s1;
o.s1(a3, a4, ... a(i2 + 2));
push(o);
Action Flash Version: 
5
See Also: 
Declare Object
Duplicate Sprite
Extends
Get Member
Implements
New Method
Set Member

Pop the class name for the new object to create. Pop the number of arguments. Pop each argument (if i2 is zero, then no arguments are popped.) Create an object of class s1. Call the constructor function (which has the same name as the object class: s1). The result of the constructor is discarded. Push the created object on the stack. The object should then be saved in a variable or object member.

Implements

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
44
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (o), pop 1 (i), pop i2 (o)
Action Operation: 
o1 := pop();
i2 := pop();
for (idx := 3; idx <= i2 + 2; ++idx) {
  oidx := pop();
}
o1 implements o3, o4, o5, ... , o(i2 +2)
Action Flash Version: 
7
See Also: 
Cast Object
Declare Object
Extends
Instance Of
Type Of

This action declares an object as a sub-class of one or more interfaces. The syntax here is simple, the real implementation is quite unbelievably difficult to fathom.

The following shows you how you can add an implements of interfaces "A" and "B" to the class "C". Notice that class "C" needs to already exist. Here we assume that all classes are defined in the global scope.

	push data "_global"
	get variable
	push data "A"
	get member
	push data "_global"
	get variable
	push data "B"
	get ...