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NetworkUtils
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Added checks to see if a network stack is available

connection_type_change
nathan 2020-09-10 00:22:47 +02:00
parent 2872a46442
commit 0ea4ed19b2
3 changed files with 81 additions and 1 deletions
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2
build.gradle.kts
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@ -43,7 +43,7 @@ object Extras {
// set for the project
const val description = "Utilities for managing network configurations, IP/MAC address conversion, and ping (via OS native commands)"
const val group = "com.dorkbox"
const val version = "1.4"
const val version = "1.5"
// set as project.ext
const val name = "NetworkUtils"

40
src/dorkbox/netUtil/IPv4.kt
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@ -22,7 +22,9 @@ import java.io.Writer
import java.net.Inet4Address
import java.net.InetAddress
import java.net.InetSocketAddress
import java.net.NetworkInterface
import java.net.Socket
import java.net.SocketException
import java.util.*
import kotlin.math.floor
import kotlin.math.ln
@ -47,6 +49,44 @@ object IPv4 {
*/
val isPreferred = Common.getBoolean("java.net.preferIPv4Stack", false)
/**
* true if there is an IPv4 network interface available
*/
val isAvailable: Boolean by lazy {
// Retrieve the list of available network interfaces.
val netInterfaces = mutableListOf<NetworkInterface>()
try {
val interfaces = NetworkInterface.getNetworkInterfaces()
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
val iface: NetworkInterface = interfaces.nextElement()
// Use the interface with proper INET addresses only.
if (SocketUtils.addressesFromNetworkInterface(iface).hasMoreElements()) {
netInterfaces.add(iface)
}
}
}
} catch (e: SocketException) {
Common.logger.warn("Failed to retrieve the list of available network interfaces", e)
}
// check if IPv4 is possible.
var ipv4Possible = false
loop@ for (iface in netInterfaces) {
val i = SocketUtils.addressesFromNetworkInterface(iface)
while (i.hasMoreElements()) {
val addr: InetAddress = i.nextElement()
if (addr is Inet4Address) {
ipv4Possible = true
break@loop
}
}
}
ipv4Possible
}
/**
* The [Inet4Address] that represents the IPv4 loopback address '127.0.0.1'
*/

40
src/dorkbox/netUtil/IPv6.kt
View File

@ -20,6 +20,8 @@ package dorkbox.netUtil
import java.net.Inet4Address
import java.net.Inet6Address
import java.net.InetAddress
import java.net.NetworkInterface
import java.net.SocketException
import java.net.UnknownHostException
/**
@ -82,6 +84,44 @@ object IPv6 {
*/
val isPreferred = Common.getBoolean("java.net.preferIPv6Addresses", false)
/**
* true if there is an IPv6 network interface available
*/
val isAvailable: Boolean by lazy {
// Retrieve the list of available network interfaces.
val netInterfaces = mutableListOf<NetworkInterface>()
try {
val interfaces = NetworkInterface.getNetworkInterfaces()
if (interfaces != null) {
while (interfaces.hasMoreElements()) {
val iface: NetworkInterface = interfaces.nextElement()
// Use the interface with proper INET addresses only.
if (SocketUtils.addressesFromNetworkInterface(iface).hasMoreElements()) {
netInterfaces.add(iface)
}
}
}
} catch (e: SocketException) {
Common.logger.warn("Failed to retrieve the list of available network interfaces", e)
}
// check if IPv4 is possible.
var ipv6Possible = false
loop@ for (iface in netInterfaces) {
val i = SocketUtils.addressesFromNetworkInterface(iface)
while (i.hasMoreElements()) {
val addr: InetAddress = i.nextElement()
if (addr is Inet6Address) {
ipv6Possible = true
break@loop
}
}
}
ipv6Possible
}
/**
* The [Inet6Address] that represents the IPv6 loopback address '::1'
*/