# [Snort-users] How do I convert a snort source IP Number to IP address in Microsoft SQL Server

Joe Stocker jstocker101 at ...125...
Mon May 10 07:23:05 EDT 2004

```Hello,
I am unable to convert the new snort database log format of an IP number
from 2130706433 back to 127.0.0.1 using Microsoft SQL Server.
I have been unable to find any examples except for MySQL and PostgreSQL.
In MySQL you can use the inet_ntoa function: SELECT ip_src,
inet_ntoa(ip_src) FROM iphdr;
In PostgreSQL you can write your own function.
But how would you write that function in Microsoft SQL?
The ACID web page has a FAQ which describes how this should theoretically
work:
http://acidlab.sourceforge.net/acid_faq.html#faq_e1
Let IP  = the 32-bit unsigned integer representation of the IP address
ip1 = octet 1 of 4 (high-order)
ip2 = octet 2 of 4
ip3 = octet 3 of 4
ip4 = octet 4 of 4 (low-order)

>>  = bitwise shift right operator; takes an operand of the number bits
to shift
AND = bitwise AND operator

Then,
ip1 = IP >> 24
ip2 = (IP AND 00000000 11111111 00000000 00000000) >> 16
ip3 = (IP AND 00000000 00000000 11111111 00000000) >> 8
ip4 = (IP AND 00000000 00000000 00000000 11111111)

IP = ip1 . ip2 . ip3 . ip4
***problem*** There is no >> operator in Microsoft SQL.
The choices are ^ (Bitwise Exlusive OR), & (Bitwise AND), | (Bitwise OR)

My attempt thus far in Microsoft SQL was:
select (convert(bigint,2130706433) ^ 24 -- Returns 02130706457 (BAD!) --
Should be 127
select (convert(bigint,2130706433) ^ 16) & 255  -- Returns 17 (BAD!) --
Should be 0
select (convert(bigint,2130706433) ^ 8) & 255  -- Returns 9 (BAD!) -- Should
be 0
select convert(bigint,2130706433) & 255    -- Returns 1 for the last octet
(GOOD!)

What am I doing wrong?
Thanks!

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