2018-03-15 21:03:41 +01:00
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/*
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2019-04-09 20:39:42 +02:00
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* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
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2018-03-15 21:03:41 +01:00
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net
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import (
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"encoding/json"
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"errors"
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"net"
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"regexp"
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"strings"
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)
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var hostLabelRegexp = regexp.MustCompile("^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?$")
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// Host - holds network host IP/name and its port.
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type Host struct {
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Name string
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Port Port
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IsPortSet bool
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}
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// IsEmpty - returns whether Host is empty or not
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func (host Host) IsEmpty() bool {
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return host.Name == ""
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}
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// String - returns string representation of Host.
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func (host Host) String() string {
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if !host.IsPortSet {
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return host.Name
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}
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2018-12-14 08:37:46 +01:00
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return net.JoinHostPort(host.Name, host.Port.String())
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2018-03-15 21:03:41 +01:00
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}
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// Equal - checks whether given host is equal or not.
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func (host Host) Equal(compHost Host) bool {
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return host.String() == compHost.String()
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}
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// MarshalJSON - converts Host into JSON data
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func (host Host) MarshalJSON() ([]byte, error) {
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return json.Marshal(host.String())
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}
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// UnmarshalJSON - parses data into Host.
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func (host *Host) UnmarshalJSON(data []byte) (err error) {
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var s string
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if err = json.Unmarshal(data, &s); err != nil {
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return err
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}
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// Allow empty string
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if s == "" {
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*host = Host{}
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return nil
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}
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var h *Host
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if h, err = ParseHost(s); err != nil {
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return err
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}
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*host = *h
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return nil
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}
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// ParseHost - parses string into Host
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func ParseHost(s string) (*Host, error) {
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2019-11-26 20:42:10 +01:00
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if s == "" {
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return nil, errors.New("invalid argument")
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}
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2018-03-15 21:03:41 +01:00
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isValidHost := func(host string) bool {
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if host == "" {
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2019-11-26 20:42:10 +01:00
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return true
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2018-03-15 21:03:41 +01:00
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}
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if ip := net.ParseIP(host); ip != nil {
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return true
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}
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// host is not a valid IPv4 or IPv6 address
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// host may be a hostname
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// refer https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_host_names
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// why checks are done like below
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if len(host) < 1 || len(host) > 253 {
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return false
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}
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for _, label := range strings.Split(host, ".") {
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if len(label) < 1 || len(label) > 63 {
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return false
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}
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if !hostLabelRegexp.MatchString(label) {
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return false
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}
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}
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return true
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}
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var port Port
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var isPortSet bool
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host, portStr, err := net.SplitHostPort(s)
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if err != nil {
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if !strings.Contains(err.Error(), "missing port in address") {
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return nil, err
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}
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host = s
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} else {
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if port, err = ParsePort(portStr); err != nil {
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return nil, err
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}
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isPortSet = true
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}
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2019-05-03 14:01:33 +02:00
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if host != "" {
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host, err = trimIPv6(host)
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if err != nil {
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return nil, err
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}
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}
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// IPv6 requires a link-local address on every network interface.
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// `%interface` should be preserved.
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trimmedHost := host
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if i := strings.LastIndex(trimmedHost, "%"); i > -1 {
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// `%interface` can be skipped for validity check though.
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trimmedHost = trimmedHost[:i]
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2018-12-14 08:37:46 +01:00
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}
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2019-05-03 14:01:33 +02:00
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if !isValidHost(trimmedHost) {
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2018-03-15 21:03:41 +01:00
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return nil, errors.New("invalid hostname")
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}
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return &Host{
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Name: host,
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Port: port,
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IsPortSet: isPortSet,
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}, nil
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}
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2019-05-03 14:01:33 +02:00
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// IPv6 can be embedded with square brackets.
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func trimIPv6(host string) (string, error) {
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// `missing ']' in host` error is already handled in `SplitHostPort`
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if host[len(host)-1] == ']' {
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if host[0] != '[' {
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return "", errors.New("missing '[' in host")
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}
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return host[1:][:len(host)-2], nil
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}
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return host, nil
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}
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