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ip.go
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ip.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package utils
import (
"errors"
"fmt"
"net"
"strconv"
)
// This was taken from: https://stackoverflow.com/a/50825191/3478466
var privateIPBlocks []*net.IPNet
func init() {
for _, cidr := range []string{
"127.0.0.0/8", // IPv4 loopback
"10.0.0.0/8", // RFC1918
"172.16.0.0/12", // RFC1918
"192.168.0.0/16", // RFC1918
"169.254.0.0/16", // RFC3927 link-local
"::1/128", // IPv6 loopback
"fe80::/10", // IPv6 link-local
"fc00::/7", // IPv6 unique local addr
} {
_, block, err := net.ParseCIDR(cidr)
if err != nil {
panic(fmt.Errorf("parse error on %q: %v", cidr, err))
}
privateIPBlocks = append(privateIPBlocks, block)
}
}
var (
errBadIP = errors.New("bad ip format")
)
// IPDesc ...
type IPDesc struct {
IP net.IP
Port uint16
}
// Equal ...
func (ipDesc IPDesc) Equal(otherIPDesc IPDesc) bool {
return ipDesc.Port == otherIPDesc.Port &&
ipDesc.IP.Equal(otherIPDesc.IP)
}
// PortString ...
func (ipDesc IPDesc) PortString() string {
return fmt.Sprintf(":%d", ipDesc.Port)
}
func (ipDesc IPDesc) String() string {
return net.JoinHostPort(ipDesc.IP.String(), fmt.Sprintf("%d", ipDesc.Port))
}
// IsPrivate attempts to decide if the ip address in this descriptor is a local
// ip address.
// This function was taken from: https://stackoverflow.com/a/50825191/3478466
func (ipDesc IPDesc) IsPrivate() bool {
ip := ipDesc.IP
if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
return true
}
for _, block := range privateIPBlocks {
if block.Contains(ip) {
return true
}
}
return true
}
// IsZero returns if the IP or port is zeroed out
func (ipDesc IPDesc) IsZero() bool {
ip := ipDesc.IP
return ipDesc.Port == 0 ||
len(ip) == 0 ||
ip.Equal(net.IPv4zero) ||
ip.Equal(net.IPv6zero)
}
// ToIPDesc ...
func ToIPDesc(str string) (IPDesc, error) {
host, portStr, err := net.SplitHostPort(str)
if err != nil {
return IPDesc{}, errBadIP
}
port, err := strconv.ParseUint(portStr, 10 /*=base*/, 16 /*=size*/)
if err != nil {
// TODO: Should this return a locally defined error? (e.g. errBadPort)
return IPDesc{}, err
}
ip := net.ParseIP(host)
if ip == nil {
return IPDesc{}, errBadIP
}
return IPDesc{
IP: ip,
Port: uint16(port),
}, nil
}