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package moe.yuuta.dn42peering.agent.provision;
import io.vertx.core.CompositeFuture;
import io.vertx.core.Future;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.file.FileSystemException;
import io.vertx.core.impl.logging.Logger;
import io.vertx.core.impl.logging.LoggerFactory;
import io.vertx.ext.web.common.template.TemplateEngine;
import io.vertx.ext.web.templ.freemarker.FreeMarkerTemplateEngine;
import moe.yuuta.dn42peering.agent.proto.Node;
import moe.yuuta.dn42peering.agent.proto.WireGuardConfig;
import javax.annotation.Nonnull;
import java.io.File;
import java.io.IOException;
import java.net.Inet6Address;
import java.nio.file.NoSuchFileException;
import java.util.*;
import java.util.stream.Collectors;
public class WireGuardProvisioner implements IProvisioner<WireGuardConfig> {
private final Logger logger = LoggerFactory.getLogger(getClass().getSimpleName());
private final TemplateEngine engine;
private final Vertx vertx;
public WireGuardProvisioner(@Nonnull Vertx vertx) {
this(FreeMarkerTemplateEngine.create(vertx, "ftlh"), vertx);
}
public WireGuardProvisioner(@Nonnull TemplateEngine engine,
@Nonnull Vertx vertx) {
this.engine = engine;
this.vertx = vertx;
}
@Nonnull
private Future<List<Change>> calculateDeleteChanges(@Nonnull List<WireGuardConfig> allDesired) {
final String[] actualNamesRaw = new File("/etc/wireguard/").list((dir, name) -> name.matches("wg_.*\\.conf"));
final List<String> actualNames = Arrays.stream(actualNamesRaw == null ? new String[]{} : actualNamesRaw)
.sorted()
.collect(Collectors.toList());
final String[] desiredNames = allDesired
.stream()
.map(desired -> generateWGPath(desired.getInterface()))
.sorted()
.collect(Collectors.toList())
.toArray(new String[]{});
final List<Integer> toRemove = new ArrayList<>(actualNames.size());
for (int i = 0; i < desiredNames.length; i ++) {
toRemove.clear();
for(int j = 0; j < actualNames.size(); j ++) {
if(("/etc/wireguard/" + actualNames.get(j)).equals(desiredNames[i])) {
toRemove.add(j);
}
}
for (int j = 0; j < toRemove.size(); j ++) {
actualNames.remove(toRemove.get(j).intValue());
}
}
return Future.succeededFuture(actualNames.stream()
.flatMap(string -> {
return Arrays.stream(new Change[] {
new CommandChange(new String[]{ "systemctl", "disable", "--now", "-q", "wg-quick@" + string }),
new FileChange("/etc/wireguard/" + string, null, FileChange.Action.DELETE.toString())
});
})
.collect(Collectors.toList()));
}
@Nonnull
private static String generateWGPath(@Nonnull String iif) {
return String.format("/etc/wireguard/%s.conf", iif);
}
@Nonnull
private Future<Buffer> readConfig(@Nonnull String iif) {
return Future.future(f -> {
vertx.fileSystem()
.readFile(generateWGPath(iif))
.onFailure(err -> {
if(err instanceof FileSystemException &&
err.getCause() instanceof NoSuchFileException) {
f.complete(null);
} else {
f.fail(err);
}
})
.onSuccess(f::complete);
});
}
@Nonnull
private Future<Buffer> renderConfig(@Nonnull Node node, @Nonnull WireGuardConfig config) {
final Map<String, Object> params = new HashMap<>(9);
params.put("listen_port", config.getListenPort());
params.put("self_priv_key", config.getSelfPrivKey());
params.put("dev", config.getInterface());
params.put("self_ipv4", node.getIpv4());
params.put("peer_ipv4", config.getPeerIPv4());
if (!config.getPeerIPv6().equals("")) {
params.put("peer_ipv6", config.getPeerIPv6());
try {
final boolean ll = Inet6Address.getByName(config.getPeerIPv6()).isLinkLocalAddress();
params.put("peer_ipv6_ll", ll);
if(ll)
params.put("self_ipv6", node.getIpv6());
else
params.put("self_ipv6", node.getIpv6NonLL());
} catch (IOException e) {
return Future.failedFuture(e);
}
}
params.put("preshared_key", config.getSelfPresharedSecret());
if(!config.getEndpoint().equals("")) {
params.put("endpoint", config.getEndpoint());
}
params.put("peer_pub_key", config.getPeerPubKey());
return engine.render(params, "wg.conf.ftlh");
}
@Nonnull
private Future<List<Change>> calculateSingleConfigChange(@Nonnull Node node,
@Nonnull WireGuardConfig desiredConfig) {
return CompositeFuture.all(readConfig(desiredConfig.getInterface()), renderConfig(node, desiredConfig))
.compose(future -> {
final Buffer actualBuff = future.resultAt(0);
final String actual = actualBuff == null ? null : actualBuff.toString();
final String desired = future.resultAt(1).toString();
final List<Change> changes = new ArrayList<>(1);
if(actual == null) {
changes.add(new FileChange(generateWGPath(desiredConfig.getInterface()),
desired,
FileChange.Action.CREATE_AND_WRITE.toString()));
changes.add(
new CommandChange(new String[] { "systemctl",
"enable",
"--now",
"-q",
"wg-quick@" + desiredConfig.getInterface() }));
} else if(!actual.equals(desired)) {
// TODO: Smart reloading / restarting
changes.add(new FileChange(generateWGPath(desiredConfig.getInterface()),
desired,
FileChange.Action.OVERWRITE.toString()));
changes.add(
new CommandChange(new String[] { "systemctl",
"restart",
"-q",
"wg-quick@" + desiredConfig.getInterface() }));
}
return Future.succeededFuture(changes);
});
}
@Nonnull
private Future<List<Change>> calculateSingleServiceStatusChange(@Nonnull WireGuardConfig desiredConfig) {
// Check if the service is not started or in wrong state.
return AsyncShell.exec(vertx, "systemctl", "is-active", "wg-quick@" + desiredConfig.getInterface())
.compose(res -> {
if(res == 0) {
return Future.succeededFuture(Collections.emptyList());
}
return Future.succeededFuture(Collections.singletonList(
new CommandChange(new String[] { "systemctl",
"enable",
"--now",
"-q",
"wg-quick@" + desiredConfig.getInterface() })
));
});
}
@Nonnull
@Override
public Future<List<Change>> calculateChanges(@Nonnull Node node, @Nonnull List<WireGuardConfig> allDesired) {
final List<Future<List<Change>>> addOrModifyChanges =
allDesired.stream().map(desired -> calculateSingleConfigChange(node, desired)).collect(Collectors.toList());
final List<Future<List<Change>>> serviceChanges =
allDesired.stream().map(this::calculateSingleServiceStatusChange).collect(Collectors.toList());
final Future<List<Change>> deleteChanges =
calculateDeleteChanges(allDesired);
final List<Future> futures = new ArrayList<>(addOrModifyChanges.size() + 1);
futures.addAll(addOrModifyChanges);
futures.addAll(serviceChanges);
futures.add(deleteChanges);
return CompositeFuture.all(futures)
.compose(compositeFuture -> {
final List<Change> changes = new ArrayList<>(futures.size());
for(int i = 0; i < futures.size(); i ++) {
changes.addAll(compositeFuture.resultAt(i));
}
return Future.succeededFuture(changes);
});
}
}
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