Alexander Shikoff wrote:
> Thanks a lot. I've read that chapter a lot of times before wrote to this
> mailing list. What about the case if database field contains not a single
> IP-address but a network address? In MySQL there is no way to write
> WHERE condition which will match IP-address against address of network.
>
> Example:
>
> SELECT `prefix` FROM `nets` WHERE `class` = 'WHITE' returns '193.0.0.0/21'.
>
> hostlist white_list = mysql;SELECT `prefix` FROM `nets` WHERE `class` = 'WHITE'
> acl_check_rcpt:
> warn
> message = host is white
> hosts = +white_list
>
> 'warn' condition in example above will match any host address because a query
> to database is always successful.
This is a WHERE fragment that I use:
data='$sender_host_address' OR \
INET_ATON('$sender_host_address') & (-1 << 32 - SUBSTRING_INDEX(data,'/',-1)) = INET_ATON(SUBSTRING_INDEX(data,'/',1))
The table contains more than just ip lists so the column's name is data.
The format is your typical IP or network/bits notation. There's no error
checking so if the network is a host address, the match will always fail.
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