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ip_port.go
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ip_port.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package ips
import (
"errors"
"fmt"
"net"
"strconv"
"github.com/ava-labs/avalanchego/utils/wrappers"
)
const (
IPPortLen = net.IPv6len + wrappers.ShortLen
nullStr = "null"
)
var (
errMissingQuotes = errors.New("first and last characters should be quotes")
errBadIP = errors.New("bad ip format")
)
type IPDesc IPPort
func (ipDesc IPDesc) String() string {
return IPPort(ipDesc).String()
}
func (ipDesc IPDesc) MarshalJSON() ([]byte, error) {
return []byte(`"` + ipDesc.String() + `"`), nil
}
func (ipDesc *IPDesc) UnmarshalJSON(b []byte) error {
str := string(b)
if str == nullStr { // If "null", do nothing
return nil
} else if len(str) < 2 {
return errMissingQuotes
}
lastIndex := len(str) - 1
if str[0] != '"' || str[lastIndex] != '"' {
return errMissingQuotes
}
ipPort, err := ToIPPort(str[1:lastIndex])
if err != nil {
return fmt.Errorf("couldn't decode to IPPort: %w", err)
}
*ipDesc = IPDesc(ipPort)
return nil
}
// An IP and a port.
type IPPort struct {
IP net.IP `json:"ip"`
Port uint16 `json:"port"`
}
func (ipPort IPPort) Equal(other IPPort) bool {
return ipPort.Port == other.Port && ipPort.IP.Equal(other.IP)
}
func (ipPort IPPort) String() string {
return net.JoinHostPort(ipPort.IP.String(), strconv.FormatUint(uint64(ipPort.Port), 10))
}
// IsZero returns if the IP or port is zeroed out
func (ipPort IPPort) IsZero() bool {
ip := ipPort.IP
return ipPort.Port == 0 ||
len(ip) == 0 ||
ip.Equal(net.IPv4zero) ||
ip.Equal(net.IPv6zero)
}
func ToIPPort(str string) (IPPort, error) {
host, portStr, err := net.SplitHostPort(str)
if err != nil {
return IPPort{}, 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 IPPort{}, err
}
ip := net.ParseIP(host)
if ip == nil {
return IPPort{}, errBadIP
}
return IPPort{
IP: ip,
Port: uint16(port),
}, nil
}
// PackIP packs an ip port pair to the byte array
func PackIP(p *wrappers.Packer, ip IPPort) {
p.PackFixedBytes(ip.IP.To16())
p.PackShort(ip.Port)
}