Esempio n. 1
0
// return an available ip if one is currently available.  If not,
// return the next available ip for the nextwork
func (allocated *allocatedMap) getNextIP(network *net.IPNet) (*net.IP, error) {
	var (
		ownIP    = ipToInt(&network.IP)
		first, _ = networkdriver.NetworkRange(network)
		base     = ipToInt(&first)
		size     = int(networkdriver.NetworkSize(network.Mask))
		max      = int32(size - 2) // size -1 for the broadcast network, -1 for the gateway network
		pos      = allocated.last
	)

	var (
		firstNetIP = network.IP.To4().Mask(network.Mask)
		firstAsInt = ipToInt(&firstNetIP) + 1
	)

	for i := int32(0); i < max; i++ {
		pos = pos%max + 1
		next := int32(base + pos)

		if next == ownIP || next == firstAsInt {
			continue
		}
		if _, ok := allocated.p[pos]; ok {
			continue
		}
		allocated.p[pos] = struct{}{}
		allocated.last = pos
		return intToIP(next), nil
	}
	return nil, ErrNoAvailableIPs
}
Esempio n. 2
0
// convert the ip into the position in the subnet.  Only
// position are saved in the set
func getPosition(network *net.IPNet, ip *net.IP) int32 {
	first, _ := networkdriver.NetworkRange(network)
	return ipToInt(ip) - ipToInt(&first)
}