C: manage IP addresses

Ephracis · 07-21-2006, 06:02 PM

Hi,

Is there an easy way to manage ip addresses? I need to store an ip address and work with increasements on it (ie 192.168.0.255 becomes 192.168.1.0). I would like to avoid the struggle of storing it as char and work with each character individually when increasing it.

Thanks.

spooon · 07-21-2006, 06:19 PM

So an IPv4 address is 4 bytes. You can store that in a 32-bit integer, in big-endian order; then you can just increment the integer as you like.

Ephracis · 07-22-2006, 11:47 AM

Ok, but how do I store them in big-endian order?

Ephracis · 07-22-2006, 01:18 PM

Never mind, this worked:
target.s_addr = htonl(ntohl(target.s_addr)+1);