106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
package net
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import (
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"net"
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)
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// Sub class net.IPNet so that we can add JSON marshalling and unmarshalling.
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type IPNet struct {
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net.IPNet
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}
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// Version returns the IP version for an IPNet, or 0 if not a valid IP net.
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func (i *IPNet) Version() int {
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if i.IP.To4() != nil {
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return 4
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} else if len(i.IP) == net.IPv6len {
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return 6
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}
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return 0
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}
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// IsNetOverlap is a utility function that returns true if the two subnet have an overlap.
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func (i IPNet) IsNetOverlap(n net.IPNet) bool {
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return n.Contains(i.IP) || i.Contains(n.IP)
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}
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// Network returns the masked IP network.
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func (i *IPNet) Network() *IPNet {
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_, n, _ := ParseCIDR(i.String())
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return n
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}
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func ParseCIDR(c string) (*IP, *IPNet, error) {
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netIP, netIPNet, e := net.ParseCIDR(c)
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if netIPNet == nil || e != nil {
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return nil, nil, e
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}
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ip := &IP{netIP}
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ipnet := &IPNet{*netIPNet}
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// The base golang net library always uses a 4-byte IPv4 address in an
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// IPv4 IPNet, so for uniformity in the returned types, make sure the
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// IP address is also 4-bytes - this allows the user to safely assume
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// all IP addresses returned by this function use the same encoding
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// mechanism (not strictly required but better for testing and debugging).
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if ip4 := ip.IP.To4(); ip4 != nil {
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ip.IP = ip4
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}
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return ip, ipnet, nil
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}
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// Parse a CIDR or an IP address and return the IP, CIDR or error. If an IP address
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// string is supplied, then the CIDR returned is the fully masked IP address (i.e /32 or /128)
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func ParseCIDROrIP(c string) (*IP, *IPNet, error) {
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// First try parsing as a CIDR.
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ip, cidr, err := ParseCIDR(c)
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if err == nil {
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return ip, cidr, nil
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}
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// That failed, so try parsing as an IP.
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ip = &IP{}
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if err2 := ip.UnmarshalText([]byte(c)); err2 == nil {
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if ip4 := ip.IP.To4(); ip4 != nil {
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ip.IP = ip4
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}
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n := ip.Network()
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return ip, n, nil
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}
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// That failed too, return the original error.
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return nil, nil, err
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}
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// String returns a friendly name for the network. The standard net package
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// implements String() on the pointer, which means it will not be invoked on a
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// struct type, so we re-implement on the struct type.
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func (i IPNet) String() string {
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ip := &i.IPNet
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return ip.String()
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}
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// MustParseNetwork parses the string into a IPNet. The IP address in the
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// IPNet is masked.
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func MustParseNetwork(c string) IPNet {
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_, cidr, err := ParseCIDR(c)
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if err != nil {
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panic(err)
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}
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return *cidr
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}
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// MustParseCIDR parses the string into a IPNet. The IP address in the
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// IPNet is not masked.
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func MustParseCIDR(c string) IPNet {
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ip, cidr, err := ParseCIDR(c)
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if err != nil {
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panic(err)
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}
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n := IPNet{}
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n.IP = ip.IP
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n.Mask = cidr.Mask
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return n
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}
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