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IPv6 is my true love

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creeper123123321 2021-02-28 19:19:17 -03:00
parent 0b101d1278
commit 779e1dab4d
1 changed files with 49 additions and 14 deletions
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63
src/main/kotlin/com/github/creeper123123321/viaaas/handler/state/Util.kt
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@ -15,17 +15,18 @@ import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import us.myles.ViaVersion.packets.State
import java.net.Inet4Address
import java.net.InetAddress
import java.net.InetSocketAddress
fun createBackChannel(handler: MinecraftHandler, socketAddr: InetSocketAddress, state: State): ChannelFuture {
private fun createBackChannel(handler: MinecraftHandler, socketAddr: InetSocketAddress, state: State): ChannelFuture {
return Bootstrap()
.handler(BackEndInit(handler.data))
.channelFactory(channelSocketFactory())
.group(handler.data.frontChannel.eventLoop())
.option(ChannelOption.IP_TOS, 0x18)
.option(ChannelOption.TCP_NODELAY, true)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 15_000) // Half of mc timeout
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10_000) // We need to show the error before the client timeout
.connect(socketAddr)
.addListener(ChannelFutureListener {
if (it.isSuccess) {
@ -41,29 +42,63 @@ fun createBackChannel(handler: MinecraftHandler, socketAddr: InetSocketAddress,
forward(handler, packet, true)
handler.data.frontChannel.setAutoRead(true)
} else {
// We're in the event loop
handler.disconnect("Couldn't connect: " + it.cause().toString())
}
})
}
private fun tryBackAddress(
handler: MinecraftHandler,
iterator: Iterator<InetAddress>,
port: Int,
state: State,
success: () -> Unit,
) {
val fail = { e: Throwable ->
if (!iterator.hasNext()) {
// We're in the event loop
handler.disconnect("Couldn't connect: $e")
} else if (handler.data.frontChannel.isActive) {
tryBackAddress(handler, iterator, port, state, success)
}
}
try {
val socketAddr = InetSocketAddress(iterator.next(), port)
if (checkLocalAddress(socketAddr.address)
|| matchesAddress(socketAddr, VIAaaSConfig.blockedBackAddresses)
|| !matchesAddress(socketAddr, VIAaaSConfig.allowedBackAddresses)
) {
throw SecurityException("Not allowed")
}
createBackChannel(handler, socketAddr, state).addListener {
if (it.isSuccess) {
success()
} else {
fail(it.cause())
}
}
} catch (e: Exception) {
handler.data.frontChannel.eventLoop().submit {
fail(e)
}
}
}
fun connectBack(handler: MinecraftHandler, address: String, port: Int, state: State, success: () -> Unit) {
handler.data.frontChannel.setAutoRead(false)
GlobalScope.launch(Dispatchers.IO) {
try {
val srvResolved = resolveSrv(address, port)
val socketAddr = InetSocketAddress(InetAddress.getByName(srvResolved.first), srvResolved.second)
val iterator = InetAddress.getAllByName(srvResolved.first)
.groupBy { it is Inet4Address }
.toSortedMap() // I'm sorry, IPv4, but my true love is IPv6... We can still be friends though...
.map { it.value.random() }
.iterator()
if (checkLocalAddress(socketAddr.address)
|| matchesAddress(socketAddr, VIAaaSConfig.blockedBackAddresses)
|| !matchesAddress(socketAddr, VIAaaSConfig.allowedBackAddresses)
) {
throw SecurityException("Not allowed")
}
createBackChannel(handler, socketAddr, state).addListener { if (it.isSuccess) success() }
if (!iterator.hasNext()) throw IllegalArgumentException("Hostname has no IP address")
tryBackAddress(handler, iterator, srvResolved.second, state, success)
} catch (e: Exception) {
handler.data.frontChannel.eventLoop().submit {
handler.disconnect("Couldn't connect: $e")