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Posted on 2009-03-30
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How to write procedure where I can from example 192.168.0.0/24 get all IP adress 192.168.0.1- 192.168.0.255 into stringlist. where is mask is 24 there is simple but how to make where ip with mask is 213.21.192.0/18 or 192.168.0.30/28
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Question by:KarlisB
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LVL 3

Author Comment

Maybe someone can give procedure to make like :

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LVL 7

Expert Comment

I am not conversant in IP traffic, but it appears the number after the slash shows you the number of bit to turn on in the mask.

I'll try to implement an algorithm to give you a list. (Correct me if my interpretation is wrong).

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LVL 7

Accepted Solution

ahalya earned 500 total points
Here is the code to list the IP in tha range given the IP & the mask bits.  I have simply used logical operands to expand the list.

Call the 'GetIPList' function with two arguments: IP-v4 address, and the MaskBits.

e.g., GetIPList('192.168.0.0', 22);

type TIPSegments = array[1..4] of byte;

function NumberToSegments(Number:longword):TIPSegments;

var j : 0..4;

begin;

for j := 4 downto 1 do

begin;

result[j] := Number mod 256;

Number := Number div 256;

end;

end;

function IPToSegments(ip:string):TIPSegments;

var i : byte;

j : 0..4;

s : string;

begin;

for j := 1 to 4 do

begin;

i := pos('.', ip);

if j < 4 then s := copy(ip, 1, i-1) else s := ip;

delete(ip, 1, i); //remove '.'

result[j] := StrToInt(s);

end;

end;

function IPToNumber(ip:string):longword;

var segment : TIPSegments;

i : 1..4;

begin;

segment := IPToSegments(ip);

result := 0;

for i := 1 to 4 do

result := result * 256 + segment[i];

end;

function NumberToIP(Number:longword):string;

var segment : TIPSegments;

i : 1..4;

begin;

result := '';

segment := NumberToSegments(Number);

result := Format('%d.%d.%d.%d', [segment[1], segment[2], segment[3], segment[4]]);

end;

var

IP   :LongWord;

i, w : longword;

begin;

IP := IPToNumber(IPStr);

WildCard := 1 shl (32 - MaskBits) - 1;

leWildCard.text := NumberToIP(WildCard);

ListBox1.Items.Clear;

for w := 1 to WildCard - 1 do

begin;

i := IP or w;

end;

leCount.text    := IntToStr(ListBox1.Items.Count);

end;
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LVL 7

Expert Comment

by the way, it appears that you'd need a Stringlist with duplicates set to dupIgnore, instead of a ListBox to make this work for any generic IP address.

0

LVL 3

Author Comment

please give what type of variables is:

Wildcard
IeWildcard

bacause I have:

[Error] Unit2.pas(106): Undeclared identifier: 'WildCard'
[Error] Unit2.pas(109): Undeclared identifier: 'leWildCard'
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LVL 7

Expert Comment

Type for WildCard and NetMask is LongWord.  Anything where name starts with le* is just a TEdit which I used to display the calculated value.

Just to give a quick comment about what I am doing:

1. Convert the IP address in to an integer (There are four 'segments' each going from 0 to 255, i.e. 8 bits. so you need a total of 32 bits hence the LongWord  -for IP-v4)

2. WildCard is an integer correspoding to the Mask.

3. NetMask is the (binary) inverse of the WildCard which has to be 'Logical-OR'ed with the original IP to get the list.

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LVL 7

Expert Comment

My wording isn't clear above:

2.  WildCard corresponds to the number of bits in the Mask, and that is the one you have to "Logical-OR' with the IP to get the list.

3.  NetMask is the binary inverse of WildCard, and gives you the 'SubNet Mask' in the traditional form (e.g. 255.255.255.0).
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