275 lines
8.8 KiB
Kotlin
275 lines
8.8 KiB
Kotlin
/*
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* Copyright 2020 dorkbox, llc
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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 dorkbox.netUtil
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import dorkbox.executor.Executor
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import dorkbox.netUtil.dnsUtils.DefaultHostsFileResolver
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import dorkbox.netUtil.dnsUtils.ResolveConf
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import dorkbox.netUtil.dnsUtils.ResolvedAddressTypes
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import java.io.BufferedWriter
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import java.io.File
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import java.io.FileWriter
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import java.io.IOException
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import java.net.Inet4Address
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import java.net.Inet6Address
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import java.net.InetAddress
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import java.net.InetSocketAddress
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object Dns {
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/**
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* Gets the version number.
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*/
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const val version = Common.version
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const val DEFAULT_SEARCH_DOMAIN = ""
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private val exceptions = HashSet<String>()
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private val suffixes = HashSet<String>()
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/**
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* @throws IOException if the DNS resolve.conf file cannot be read
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*/
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fun setDNSServers(dnsServersString: String) {
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if (Common.OS_LINUX) {
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val dnsServers = dnsServersString.split(",")
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val dnsFile = File("/etc/resolvconf/resolv.conf.d/head")
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if (!dnsFile.canRead()) {
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throw IOException("Unable to initialize dns server file. Something is SERIOUSLY wrong")
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}
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BufferedWriter(FileWriter(dnsFile)).use {
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it.write("# File location: /etc/resolvconf/resolv.conf.d/head\n")
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it.write("# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)\n")
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dnsServers.forEach { dns ->
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it.write("nameserver $dns\n")
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}
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it.flush();
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}
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Executor().command("resolvconf", "-u").startBlocking()
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} else {
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throw RuntimeException("NOT IMPL.")
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}
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}
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/**
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* Resolve the address of a hostname against the entries in a hosts file, depending on some address types.
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*
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* @param inetHost the hostname to resolve
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* @param resolvedAddressTypes the address types to resolve
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*
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* @return the first matching address or null
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*/
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fun resolveFromHosts(inetHost: String, resolvedAddressTypes: ResolvedAddressTypes = ResolvedAddressTypes.IPV4_PREFERRED): InetAddress? {
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return DefaultHostsFileResolver.address(inetHost, resolvedAddressTypes)
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}
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/** Returns all name servers, including the default ones. */
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val nameServers: Map<String, List<InetSocketAddress>> by lazy {
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ResolveConf.getUnsortedNameServers()
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}
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/** Returns all default name servers. */
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val defaultNameServers: List<InetSocketAddress> by lazy {
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val defaultServers = nameServers[DEFAULT_SEARCH_DOMAIN]!!
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if (IPv6.isPreferred) {
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// prefer IPv6: return IPv6 first, then IPv4 (each in the order added)
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defaultServers.filter { it.address is Inet6Address } + defaultServers.filter { it.address is Inet4Address }
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} else if (IPv4.isPreferred) {
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// skip IPv6 addresses
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defaultServers.filter { it.address is Inet4Address }
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} else {
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// neither is specified, return in the order added
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defaultServers
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}
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}
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/**
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* Gets the threshold for the number of dots which must appear in a name before it is considered
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* absolute. The default is 1.
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*/
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val numberDots: Int by lazy {
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if (Common.OS_WINDOWS) {
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1
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} else {
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// first try the default unix config path
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var tryParse = ResolveConf.tryParseResolvConfNDots("/etc/resolv.conf")
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if (!tryParse.first) {
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// then fallback to netware
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tryParse = ResolveConf.tryParseResolvConfNDots("sys:/etc/resolv.cfg")
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}
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tryParse.second
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}
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}
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init {
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/**
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* And the effective_tld_names.dat is from mozilla (the following are all the same data)
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*
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*
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* https://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1
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* which is...
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* https://publicsuffix.org/list/effective_tld_names.dat
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*
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*
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* also
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*
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*
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* https://publicsuffix.org/list/public_suffix_list.dat
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*
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*
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* Parses the list from publicsuffix.org
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* new one at:
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* http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/httpclient5/src/main/java/org/apache/hc/client5/http/impl/cookie/PublicSuffixDomainFilter.java
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* and
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* http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/httpclient5/src/main/java/org/apache/hc/client5/http/psl/
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*/
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// now load this file into memory, so it's faster to process.
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val tldResource = Dns.javaClass.getResourceAsStream("/effective_tld_names.dat")
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tldResource.bufferedReader().useLines { lines ->
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lines.forEach { line ->
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var line = line
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// entire lines can also be commented using //
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if (line.isNotEmpty() && !line.startsWith("//")) {
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if (line.startsWith(".")) {
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line = line.substring(1) // A leading dot is optional
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}
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// An exclamation mark (!) at the start of a rule marks an exception
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// to a previous wildcard rule
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val isException = line.startsWith("!")
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if (isException) {
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line = line.substring(1)
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}
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if (isException) {
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exceptions.add(line)
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} else {
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suffixes.add(line)
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}
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}
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}
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}
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}
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/**
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* Extracts the second level domain, from a fully qualified domain (ie: www.aa.com, or www.amazon.co.uk).
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*
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*
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* This algorithm works from left to right parsing the domain string parameter
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*
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* @param domain a fully qualified domain (ie: www.aa.com, or www.amazon.co.uk)
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*
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* @return null (if there is no second level domain) or the SLD www.aa.com -> aa.com , or www.amazon.co.uk -> amazon.co.uk
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*/
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fun extractSLD(domain: String): String? {
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var domain = domain
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var last = domain
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var anySLD = false
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do {
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if (isTLD(domain)) {
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return if (anySLD) {
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last
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}
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else {
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null
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}
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}
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anySLD = true
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last = domain
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val nextDot = domain.indexOf(".")
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if (nextDot == -1) {
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return null
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}
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domain = domain.substring(nextDot + 1)
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} while (domain.isNotEmpty())
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return null
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}
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/**
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* Returns a domain that is without its TLD at the end.
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*
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* @param domain domain a fully qualified domain or not, (ie: www.aa.com, or amazon.co.uk).
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*
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* @return a domain that is without it's TLD, ie: www.aa.com -> www.aa, or google.com -> google
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*/
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fun withoutTLD(domain: String): String {
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var index = 0
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while (index != -1) {
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index = domain.indexOf('.', index)
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if (index != -1) {
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if (isTLD(domain.substring(index))) {
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return domain.substring(0, index)
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}
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index++
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}
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else {
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return ""
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}
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}
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return ""
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}
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/**
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* Checks if the domain is a TLD.
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*/
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fun isTLD(domain: String): Boolean {
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var domain = domain
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if (domain.startsWith(".")) {
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domain = domain.substring(1)
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}
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// An exception rule takes priority over any other matching rule.
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// Exceptions are ones that are not a TLD, but would match a pattern rule
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// e.g. bl.uk is not a TLD, but the rule *.uk means it is. Hence there is an exception rule
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// stating that bl.uk is not a TLD.
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if (exceptions.contains(domain)) {
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return false
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}
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if (suffixes.contains(domain)) {
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return true
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}
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// Try patterns. ie *.jp means that boo.jp is a TLD
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val nextdot = domain.indexOf('.')
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if (nextdot == -1) {
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return false
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}
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domain = "*" + domain.substring(nextdot)
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return suffixes.contains(domain)
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}
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}
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