Cdrc is a little tool to convert IP from/to cidr notation. It can also list all available IPs on a given network.
The utils.c files contains various function to convert IPs
back and and forth. Internal represatation (uchar *) in inspired
from Plan9's /sys/src/libip/parseip.c.
# cc -g -W -Wall cidrc.c utils.c -o cidrc
# ./cidrc
./cidrc list <network>
./cidrc conv <network>
Where network is either and IP address and a netmask, or a network in CIDR notation. Eg.
# ./cidrc conv 192.168.0.0/24
192.168.0.0 255.255.255.0
# ./cidrc conv `./cidrc conv 192.168.0.0/24`
192.168.0.0/24
# ./cidrc list 10.0.0.0/31
10.0.0.0
10.0.0.1
One can run tests through
# cc -g -W -Wall tests.c utils.c -o tests && ./tests
No output means things went well.
IPv6 in utils.c.
We assume reasonable input in cdrc. Undefined results for non-sense inpute. Ensure no segfault and the-like on special input however.
Calculate ip/mask from a base IP and number of host.
Clean around uchar/uint32_t.