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ip.go
55 lines (45 loc) · 935 Bytes
/
ip.go
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package utils
import (
"encoding/binary"
"errors"
"net"
)
var InvalidIPV4 = errors.New("Invalid IPv4")
func IPV4ToInt(ip net.IP) (uint32, error) {
if ip == nil {
return 0, InvalidIPV4
}
ip = ip.To4()
if ip == nil {
return 0, InvalidIPV4
}
return binary.BigEndian.Uint32(ip), nil
}
func IntToIPV4(ip uint32) net.IP {
data := make(net.IP, 4)
binary.BigEndian.PutUint32(data, ip)
return data
}
func IPStrToInt(ipStr string) (uint32, error) {
ip := net.ParseIP(ipStr)
if ip == nil {
return 0, InvalidIPV4
}
return IPV4ToInt(ip)
}
func IntToIPStr(ip uint32) string {
return IntToIPV4(ip).String()
}
func GetLastIPV4Int(cidr string) (lastIP4 uint32, err error) {
ip, ipNet, err := net.ParseCIDR(cidr)
if err != nil {
return
}
firstIP4, err := IPV4ToInt(ip.Mask(ipNet.Mask))
if err != nil {
return
}
ipNetMaskInt := binary.BigEndian.Uint32(ipNet.Mask)
lastIP4 = firstIP4 | ^ipNetMaskInt
return
}