KAM wrote:
> Thanks for the extra test cases. Assuming they should all fail,
> here's my new test stub. Looks good to me. Review and comment
> appreciated.
>
> http://www.pccc.com/downloads/MIMEDefang/contrib/check_primary_mx_stub.pl
Comment: not sufficiently general
Failing 127.0.0.1 and 0.0.0.0 is a good start... but there's all kinds of
invalid IP assignments that are being missed. How often are they used? I
don't know.
I believe there are some generic perl functions written along the lines of
sub ip_in_subnet($$)
{
my $ip = shift;
my $subnet = shift;
# return true if $ip is in $subnet
}
which have been posted to the list.
Bad IP blocks:
See http://www.iana.org/assignments/ipv4-address-space and others
Intranets only:
10/8
172.16/12
192.168/16
DHCP auto-discover:
169.254/16
Localhost:
127/8
Multicast:
224/8 through 239/8
IANA reserved:
0/8 # probably forever
# various others probably temporary
255/8 # probably forever
Checking the IP against all of these "bad" subnets is probably cheap
computationally, as the expensive part is getting the DNS lookup in the first
place.
--
Matthew.van.Eerde (at) hbinc.com 805.964.4554 x902
Hispanic Business Inc./HireDiversity.com Software Engineer
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