dotted IP address string

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anon

Joined: 31 Dec 2008
Posts: 2

anon 31 Dec 2008, 11:54

hi
I got ip string like here

Code:

ip db '72.14.205.100',0

how to add 1 or 10 or 1000?
thanks.

31 Dec 2008, 11:54

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 31 Dec 2008, 12:17

Where do you want to add your number? Just to one of the octets or to the whole number? You can convert it to a 32bit binary number first and then add whatever you please with the add instruction.

31 Dec 2008, 12:17

ManOfSteel

Joined: 02 Feb 2005
Posts: 1154

ManOfSteel 31 Dec 2008, 15:00

1. Use the inet_addr API to convert the IP address to an integer. Use bit rotation instructions to convert back and forth between host/network byte orders (ntohl and htonl APIs do that too), and add/inc to modify any of the four parts.

or

2. Manually parse the IP address string, convert the parts to decimal and modify accordingly.

31 Dec 2008, 15:00

Picnic

Joined: 05 May 2007
Posts: 1403
Location: Piraeus, Greece

Picnic 31 Dec 2008, 21:23

Here's a solution of doing that, hope it helps.

Code:

        invoke inet_addr, ip                  ; dot notation string to network bytes
        invoke ntohl, eax                     ; from tcp/ip network order to host byte order
        inc eax                               ; add 1
        invoke htonl, eax                     ; from host to tcp/ip network bytes
        invoke inet_ntoa, eax                 ; network bytes to dot notation string
        invoke lstrcpy, ip, eax               ; save back to buffer, mind the extra space you might need

        ;ip = '72.14.205.101',0

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31 Dec 2008, 21:23

anon

Joined: 31 Dec 2008
Posts: 2

anon 02 Jan 2009, 08:51

hi
I have to read more about APIs functions. Merry Christmas all.

02 Jan 2009, 08:51

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