Created
December 22, 2016 16:09
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| import IPy | |
| def gen_next_net(cidr): | |
| """ | |
| >>> from IPy import IP | |
| >>> get_next_net(IP("10.0.0.0/28")) | |
| IP('10.0.0.16/28') | |
| >>> reduce(lambda acc, _: get_next_net(acc), range(10), IP("10.0.0.0/28")) | |
| IP('10.0.0.160/28') | |
| """ | |
| return IPy.IP(cidr.broadcast().int() + 1).make_net(cidr.netmask()) | |
| def find_next_subnet(subnets): | |
| """Return next available cidr for subnet. | |
| :param [string] subnets: cidrs | |
| :returns: cidr | |
| :rtype: string | |
| """ | |
| subnets = map(IPy.IP, subnets) | |
| subnets_29 = [net for net in subnets if net.len() == 8] | |
| subnet = IPy.IP("10.194.167.240/29") # '0xac2a7f0' | |
| if len(subnets_29) != 0: | |
| subnet = sorted(subnets_29)[-1] | |
| def _check_cidr(cidr): | |
| if cidr.iptype() != 'PRIVATE': | |
| return False | |
| for subnet in subnets: | |
| if subnet.overlaps(cidr): | |
| return False | |
| return True | |
| for _ in range(100): | |
| subnet = gen_next_net(subnet) | |
| if _check_cidr(subnet): | |
| break | |
| else: | |
| raise Exception("Can not choose next cidr for subnets.") | |
| return str(subnet) |
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