NetworkUtils/src/dorkbox/netUtil/IPRoute.kt

62 lines
2.2 KiB
Kotlin

package dorkbox.netUtil
import java.io.BufferedWriter
import java.io.File
import java.io.FileWriter
import java.io.IOException
import java.util.*
object IPRoute {
/**
* Gets the version number.
*/
const val version = "2.9.1"
private val reservedTable = StringBuilder(2048)
private val tableNames: MutableMap<Int, String?> = HashMap(256)
/**
* @throws IOException if the policy routing tables are unable to initialize
*/
fun addRtTables(tableNames: Map<Int, String>) {
if (Common.OS_LINUX) {
for ((tableNumber, tableName) in tableNames) {
if (tableNumber == 0 || tableNumber == 253 || tableNumber == 254 || tableNumber == 255) {
Common.logger.error("Trying to add table with same number as reserved value. Skipping.")
continue
}
if (!IPRoute.tableNames.containsKey(tableNumber)) {
IPRoute.tableNames[tableNumber] = tableName
} else {
if (IPRoute.tableNames[tableNumber] != tableName) {
Common.logger.error("Trying to add table with the same number as another table. Skipping")
}
}
}
val table = StringBuilder(2048)
for ((tableNumber, tableName) in IPRoute.tableNames) {
table.append(tableNumber).append(" ").append(tableName).append("\n");
}
val policyRouteFile = File("/etc/iproute2/rt_tables").absoluteFile
if (!policyRouteFile.canRead()) {
throw IOException("Unable to initialize policy routing tables. Something is SERIOUSLY wrong, aborting startup!")
}
try {
BufferedWriter(FileWriter(policyRouteFile)).use { writer ->
writer.write(reservedTable.toString())
writer.write(table.toString())
writer.flush()
}
} catch (e: IOException) {
Common.logger.error("Error saving routing table file: {}", policyRouteFile, e)
}
} else {
throw RuntimeException("NOT IMPL.")
}
}
}