Re: [dev] simple portscanner

IP ranges are not supported (only single hosts and CIDR) but there is a
(public domain) tool that can convert IP ranges into CIDR:
http://www.spamshield.org/cidr-convert.c

dump_tree function has a bug: "v >> 24" should be written as "v >> 24 &
0xff" instead. After fixing it this tool can be used as follows.

portscan -p 80 `echo 192.168.1.1-192.168.1.20 | cidr-convert`

ipcalc has similar functionality but writes additional line and can't
aggregate overlapping ranges:
$ ipcalc -r 192.168.1.1 192.168.1.20
deaggregate 192.168.1.1 - 192.168.1.5
192.168.1.1/32
192.168.1.2/31
192.168.1.4/31
Received on Mon Jan 04 2010 - 17:20:33 UTC