mirror of https://github.com/hashicorp/consul
88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
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// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package dns
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import (
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"github.com/miekg/dns"
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"net"
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"strings"
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)
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func newDNSAddress(addr string) *dnsAddress {
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a := &dnsAddress{}
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a.SetAddress(addr)
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return a
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}
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// dnsAddress is a wrapper around a string that represents a DNS address and
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// provides helper methods for determining whether it is an IP or FQDN and
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// whether it is internal or external to the domain.
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type dnsAddress struct {
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addr string
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// store an IP so helpers don't have to parse it multiple times
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ip net.IP
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}
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// SetAddress sets the address field and the ip field if the string is an IP.
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func (a *dnsAddress) SetAddress(addr string) {
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a.addr = addr
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a.ip = net.ParseIP(addr)
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}
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// IP returns the IP address if the address is an IP.
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func (a *dnsAddress) IP() net.IP {
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return a.ip
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}
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// IsIP returns true if the address is an IP.
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func (a *dnsAddress) IsIP() bool {
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return a.IP() != nil
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}
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// IsIPV4 returns true if the address is an IPv4 address.
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func (a *dnsAddress) IsIPV4() bool {
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if a.IP() == nil {
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return false
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}
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return a.IP().To4() != nil
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}
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// FQDN returns the FQDN if the address is not an IP.
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func (a *dnsAddress) FQDN() string {
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if !a.IsEmptyString() && !a.IsIP() {
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return dns.Fqdn(a.addr)
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}
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return ""
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}
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// IsFQDN returns true if the address is a FQDN and not an IP.
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func (a *dnsAddress) IsFQDN() bool {
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return !a.IsEmptyString() && !a.IsIP() && dns.IsFqdn(a.FQDN())
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}
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// String returns the address as a string.
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func (a *dnsAddress) String() string {
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return a.addr
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}
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// IsEmptyString returns true if the address is an empty string.
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func (a *dnsAddress) IsEmptyString() bool {
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return a.addr == ""
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}
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// IsInternalFQDN returns true if the address is a FQDN and is internal to the domain.
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func (a *dnsAddress) IsInternalFQDN(domain string) bool {
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return !a.IsIP() && a.IsFQDN() && strings.HasSuffix(a.FQDN(), domain)
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}
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// IsInternalFQDNOrIP returns true if the address is an IP or a FQDN and is internal to the domain.
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func (a *dnsAddress) IsInternalFQDNOrIP(domain string) bool {
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return a.IsIP() || a.IsInternalFQDN(domain)
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}
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// IsExternalFQDN returns true if the address is a FQDN and is external to the domain.
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func (a *dnsAddress) IsExternalFQDN(domain string) bool {
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return !a.IsIP() && a.IsFQDN() && !strings.HasSuffix(a.FQDN(), domain)
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}
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