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https://github.com/containers/podman.git
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495884b319
The libpod/network packages were moved to c/common so that buildah can use it as well. To prevent duplication use it in podman as well and remove it from here. Signed-off-by: Paul Holzinger <pholzing@redhat.com>
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package util
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import (
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"net"
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)
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// IsIPv6 returns true if netIP is IPv6.
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func IsIPv6(netIP net.IP) bool {
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return netIP != nil && netIP.To4() == nil
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}
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// IsIPv4 returns true if netIP is IPv4.
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func IsIPv4(netIP net.IP) bool {
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return netIP != nil && netIP.To4() != nil
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}
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// LastIPInSubnet gets the last IP in a subnet
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func LastIPInSubnet(addr *net.IPNet) (net.IP, error) { //nolint:interfacer
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// re-parse to ensure clean network address
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_, cidr, err := net.ParseCIDR(addr.String())
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if err != nil {
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return nil, err
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}
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ones, bits := cidr.Mask.Size()
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if ones == bits {
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return cidr.IP, nil
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}
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for i := range cidr.IP {
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cidr.IP[i] |= ^cidr.Mask[i]
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}
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return cidr.IP, nil
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}
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// FirstIPInSubnet gets the first IP in a subnet
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func FirstIPInSubnet(addr *net.IPNet) (net.IP, error) { //nolint:interfacer
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// re-parse to ensure clean network address
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_, cidr, err := net.ParseCIDR(addr.String())
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if err != nil {
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return nil, err
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}
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ones, bits := cidr.Mask.Size()
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if ones == bits {
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return cidr.IP, nil
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}
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cidr.IP[len(cidr.IP)-1]++
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return cidr.IP, nil
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}
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// NormalizeIP will transform the given ip to the 4 byte len ipv4 if possible
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func NormalizeIP(ip *net.IP) {
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ipv4 := ip.To4()
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if ipv4 != nil {
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*ip = ipv4
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}
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}
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