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ips.go
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ips.go
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// Copyright 2018 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package common contains common Machine Database functions.
package common
import (
"encoding/binary"
"net"
"github.com/TriggerMail/luci-go/common/errors"
)
// IPv4 represents an IPv4 address.
type IPv4 uint32
// String returns a string representation of this IPv4 address.
func (i IPv4) String() string {
ip := make(net.IP, 4)
binary.BigEndian.PutUint32(ip, uint32(i))
return ip.String()
}
// IPv4Range returns the starting address and length of the given IPv4 CIDR block.
func IPv4Range(block string) (IPv4, int64, error) {
ip, subnet, err := net.ParseCIDR(block)
if err != nil {
return 0, 0, errors.Reason("invalid CIDR block %q", block).Err()
}
ipv4 := ip.Mask(subnet.Mask).To4()
if ipv4 == nil {
return 0, 0, errors.Reason("invalid IPv4 CIDR block %q", block).Err()
}
ones, _ := subnet.Mask.Size()
return IPv4(binary.BigEndian.Uint32(ipv4)), 1 << uint32(32-ones), nil
}
// ParseIPv4 returns an IPv4 address from the given string.
func ParseIPv4(s string) (IPv4, error) {
ip := net.ParseIP(s)
if ip != nil {
ip = ip.To4()
}
if ip == nil {
return 0, errors.Reason("invalid IPv4 address %q", s).Err()
}
return IPv4(binary.BigEndian.Uint32(ip)), nil
}