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/*
* Copyright (C) 2023 MURENA SAS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package foundation.e.advancedprivacy.trackers.service.usecases
import foundation.e.advancedprivacy.core.utils.runSuspendCatching
import foundation.e.advancedprivacy.trackers.domain.usecases.FilterHostnameUseCase
import foundation.e.advancedprivacy.trackers.service.data.NetworkDNSAddressRepository
import foundation.e.advancedprivacy.trackers.service.data.RequestDNSRepository
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.DelicateCoroutinesApi
import kotlinx.coroutines.GlobalScope
import org.pcap4j.packet.DnsPacket
import org.pcap4j.packet.namednumber.DnsRCode
import timber.log.Timber
import java.net.DatagramPacket
@OptIn(DelicateCoroutinesApi::class)
class ResolveDNSUseCase(
private val networkDNSAddressRepository: NetworkDNSAddressRepository,
private val filterHostnameUseCase: FilterHostnameUseCase,
private val requestDNSRepository: RequestDNSRepository,
private val scope: CoroutineScope = GlobalScope
) {
private val DNS_PORT = 53
init {
filterHostnameUseCase.writeLogJob(scope)
}
fun shouldBlock(dnsRequest: DnsPacket?): DnsPacket? {
if (dnsRequest == null) return null
return runSuspendCatching {
val host = dnsRequest.header.questions[0].qName.name
if (filterHostnameUseCase.shouldBlock(host)) {
dnsRequest.builder
.rCode(DnsRCode.NX_DOMAIN)
.response(true).build()
} else null
}.onFailure {
Timber.e(it, "Can't find host")
}.getOrNull()
}
suspend fun processDNS(dnsRequest: DnsPacket): DnsPacket? {
val blockedDnsResponse = shouldBlock(dnsRequest)
if (blockedDnsResponse != null) {
return blockedDnsResponse
}
val payload = dnsRequest.rawData
val packet = DatagramPacket(
payload,
payload.size,
networkDNSAddressRepository.dnsAddress,
DNS_PORT
)
return requestDNSRepository.processDNS(packet)
}
}
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