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package moe.yuuta.dn42peering.agent.provision;
import io.vertx.core.AsyncResult;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.file.AsyncFile;
import io.vertx.core.file.OpenOptions;
import io.vertx.core.impl.logging.Logger;
import io.vertx.core.impl.logging.LoggerFactory;
import io.vertx.ext.web.common.template.TemplateEngine;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.net.Inet6Address;
import java.util.HashMap;
import java.util.Map;
class ProvisionServiceImpl implements IProvisionService {
private final Logger logger = LoggerFactory.getLogger(getClass().getSimpleName());
private final Vertx vertx;
private final TemplateEngine engine;
ProvisionServiceImpl(@Nonnull Vertx vertx, @Nonnull TemplateEngine engine) {
this.vertx = vertx;
this.engine = engine;
}
@Nonnull
private static String generateBGPPath(int id) {
return String.format("/etc/bird/peers/dn42_%d.conf", id);
}
@Nonnull
private static String generateWGPath(@Nonnull String dev) {
return String.format("/etc/wireguard/%s.conf", dev);
}
@Nonnull
private static String generateWireGuardDevName(long id) {
return String.format("wg_%d", id);
}
@Nonnull
private static String getLockNameForBGP(long id) {
return String.format("BGP:%d", id);
}
@Nonnull
private static String getLockNameForWG(long id) {
return String.format("WG:%d", id);
}
@Nonnull
private Future<Void> writeBGPConfig(@Nonnull String localIP4,
@Nonnull String localIP6,
int id,
@Nonnull String ipv4,
@Nullable String ipv6,
@Nullable String device,
boolean mpbgp,
@Nonnull String asn,
boolean create) {
final String asnNum = asn.replace("AS", "");
return vertx.fileSystem().open(generateBGPPath(id), new OpenOptions()
.setCreateNew(create)
.setTruncateExisting(true)
.setWrite(true))
.compose(asyncFile -> {
if (mpbgp) return Future.succeededFuture(asyncFile);
final Map<String, Object> params = new HashMap<>(3);
params.put("name", id);
params.put("ipv4", ipv4);
params.put("asn", asnNum);
return engine.render(params, "bird2_v4.conf.ftlh")
.compose(buffer -> asyncFile.write(buffer)
.compose(_v1 -> Future.succeededFuture(asyncFile)));
})
.compose(asyncFile -> {
if (ipv6 == null) return Future.succeededFuture(asyncFile);
final Map<String, Object> params = new HashMap<>(4);
params.put("name", id);
params.put("ipv6", ipv6);
params.put("asn", asnNum);
params.put("dev", device);
return engine.render(params, "bird2_v6.conf.ftlh")
.compose(buffer -> asyncFile.write(buffer)
.compose(_v1 -> Future.succeededFuture(asyncFile)));
})
.compose(AsyncFile::close);
}
@Nonnull
private Future<Void> writeWGConfig(boolean create,
@Nonnull String localIP4,
@Nonnull String localIP6,
@Nonnull String dev,
int listenPort,
@Nonnull String endpointWithPort,
@Nonnull String peerPubKey,
@Nonnull String selfPrivKey,
@Nonnull String selfPresharedSecret,
@Nonnull String peerIPv4,
@Nullable String peerIPv6) {
return vertx.fileSystem().open(generateWGPath(dev), new OpenOptions()
.setCreateNew(create)
.setTruncateExisting(true)
.setWrite(true))
.compose(asyncFile -> {
final Map<String, Object> params = new HashMap<>(9);
params.put("listen_port", listenPort);
params.put("self_priv_key", selfPrivKey);
params.put("dev", dev);
params.put("self_ipv4", localIP4);
params.put("peer_ipv4", peerIPv4);
params.put("peer_ipv6", peerIPv6);
if (peerIPv6 != null) {
try {
params.put("peer_ipv6_ll", Inet6Address.getByName(peerIPv6).isLinkLocalAddress());
} catch (IOException e) {
return Future.failedFuture(e);
}
}
params.put("self_ipv6", localIP6);
params.put("preshared_key", selfPresharedSecret);
params.put("endpoint", endpointWithPort);
params.put("peer_pub_key", peerPubKey);
return engine.render(params, "wg.conf.ftlh")
.compose(buffer -> asyncFile.write(buffer)
.compose(_v1 -> Future.succeededFuture(asyncFile)));
})
.compose(AsyncFile::close);
}
@Nonnull
private Future<Void> deleteBGPConfig(int id) {
return vertx.fileSystem().delete(generateBGPPath(id));
}
@Nonnull
private Future<Void> deleteWGConfig(@Nonnull String dev) {
return vertx.fileSystem().delete(generateWGPath(dev));
}
@Nonnull
@Override
public IProvisionService provisionBGP(@Nonnull String localIP4,
@Nonnull String localIP6,
int id,
@Nonnull String ipv4,
@Nullable String ipv6,
@Nullable String device,
boolean mpbgp,
@Nonnull String asn,
@Nonnull Handler<AsyncResult<Void>> handler) {
vertx.sharedData().getLocalLockWithTimeout(getLockNameForBGP(id), 1000)
.compose(lock ->
writeBGPConfig(localIP4, localIP6, id, ipv4, ipv6, device, mpbgp, asn, true)
.compose(_v -> AsyncShell.execSucc(vertx, "birdc", "configure"))
.onComplete(ar -> lock.release())
)
.onComplete(handler);
return this;
}
@Nonnull
@Override
public IProvisionService reloadBGP(@Nonnull String localIP4,
@Nonnull String localIP6,
int id,
@Nonnull String ipv4,
@Nullable String ipv6,
@Nullable String device,
boolean mpbgp,
@Nonnull String asn,
@Nonnull Handler<AsyncResult<Void>> handler) {
vertx.sharedData().getLocalLockWithTimeout(getLockNameForBGP(id), 1000)
.compose(lock ->
writeBGPConfig(localIP4, localIP6, id, ipv4, ipv6, device, mpbgp, asn, false)
.compose(_v -> AsyncShell.execSucc(vertx, "birdc", "configure"))
.onComplete(ar -> lock.release())
)
.onComplete(handler);
return this;
}
@Nonnull
@Override
public IProvisionService unprovisionBGP(int id, @Nonnull Handler<AsyncResult<Void>> handler) {
vertx.sharedData().getLocalLockWithTimeout(getLockNameForBGP(id), 1000)
.compose(lock ->
deleteBGPConfig(id)
.compose(_v -> AsyncShell.execSucc(vertx, "birdc", "configure"))
.onComplete(ar -> lock.release())
)
.onComplete(handler);
return this;
}
@Nonnull
@Override
public IProvisionService provisionVPNWireGuard(@Nonnull String localIP4,
@Nonnull String localIP6,
int id,
int listenPort,
@Nonnull String endpointWithPort,
@Nonnull String peerPubKey,
@Nonnull String selfPrivKey,
@Nonnull String selfPresharedSecret,
@Nonnull String peerIPv4,
@Nullable String peerIPv6,
@Nonnull Handler<AsyncResult<String>> handler) {
vertx.sharedData()
.getLocalLockWithTimeout(getLockNameForWG(id), 1000)
.compose(lock -> writeWGConfig(true,
localIP4,
localIP6,
generateWireGuardDevName(id),
listenPort,
endpointWithPort,
peerPubKey,
selfPrivKey,
selfPresharedSecret,
peerIPv4,
peerIPv6)
.compose(_v -> AsyncShell.execSucc(vertx, "systemctl", "enable", "--now", "-q",
String.format("wg-quick@%s", generateWireGuardDevName(id))))
.onComplete(_v -> lock.release()))
.compose(_v -> Future.succeededFuture(generateWireGuardDevName(id)))
.onComplete(handler);
return this;
}
@Nonnull
@Override
public IProvisionService reloadVPNWireGuard(@Nonnull String localIP4,
@Nonnull String localIP6,
int id,
int listenPort,
@Nonnull String endpointWithPort,
@Nonnull String peerPubKey,
@Nonnull String selfPrivKey,
@Nonnull String selfPresharedSecret,
@Nonnull String peerIPv4,
@Nullable String peerIPv6,
@Nonnull Handler<AsyncResult<String>> handler) {
vertx.sharedData()
.getLocalLockWithTimeout(getLockNameForWG(id), 1000)
.compose(lock -> writeWGConfig(false,
localIP4,
localIP6,
generateWireGuardDevName(id),
listenPort,
endpointWithPort,
peerPubKey,
selfPrivKey,
selfPresharedSecret,
peerIPv4,
peerIPv6)
.compose(_v -> AsyncShell.execSucc(vertx, "systemctl", "enable", "-q",
String.format("wg-quick@%s", generateWireGuardDevName(id))))
.compose(_v -> AsyncShell.execSucc(vertx, "systemctl", "reload-or-restart",
String.format("wg-quick@%s", generateWireGuardDevName(id))))
.onComplete(_v -> lock.release()))
.compose(_v -> Future.succeededFuture(generateWireGuardDevName(id)))
.onComplete(handler);
return this;
}
@Nonnull
@Override
public IProvisionService unprovisionVPNWireGuard(int id, @Nonnull Handler<AsyncResult<Void>> handler) {
vertx.sharedData()
.getLocalLockWithTimeout(getLockNameForWG(id), 1000)
.compose(lock -> AsyncShell.execSucc(vertx, "systemctl", "disable", "--now", "-q",
String.format("wg-quick@%s", generateWireGuardDevName(id)))
// We need to stop the service first, then delete the configuration.
.compose(_v -> deleteWGConfig(generateWireGuardDevName(id)))
.onComplete(_v -> lock.release()))
.onComplete(handler);
return this;
}
}
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