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*) make DHT DoS check configurable (requested by KoH)
- check can be disabled via property indexDistribution.dhtReceiptLimitEnabled - upper bound can be configured via indexDistribution.dhtReceiptLimit git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2234 6c8d7289-2bf4-0310-a012-ef5d649a1542
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@ -78,8 +78,10 @@ public final class transferRWI {
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final int entryc = Integer.parseInt(post.get("entryc", "")); // number of entries in indexes
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byte[] indexes = post.get("indexes", "").getBytes(); // the indexes, as list of word entries
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boolean granted = sb.getConfig("allowReceiveIndex", "false").equals("true");
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boolean checkLimit = sb.getConfigBool("indexDistribution.dhtReceiptLimitEnabled", true);
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final long cachelimit = sb.getConfigLong("indexDistribution.dhtReceiptLimit", 1000);
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final yacySeed otherPeer = yacyCore.seedDB.get(iam);
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final String otherPeerName = iam + ":" + ((otherPeer == null) ? "NULL" : (otherPeer.getName() + "/" + otherPeer.getVersion()));
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final String otherPeerName = iam + ":" + ((otherPeer == null) ? "NULL" : (otherPeer.getName() + "/" + otherPeer.getVersion()));
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// response values
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String result = "ok";
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@ -91,7 +93,7 @@ public final class transferRWI {
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sb.getLog().logInfo("Rejecting RWIs from peer " + otherPeerName + ". Not granted.");
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result = "not_granted";
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pause = 0;
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} else if (sb.wordIndex.kSize() > 1000) {
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} else if (checkLimit && sb.wordIndex.kSize() > cachelimit) {
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// we are too busy to receive indexes
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sb.getLog().logInfo("Rejecting RWIs from peer " + otherPeerName + ". We are too busy (buffersize=" + sb.wordIndex.kSize() + ").");
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granted = false; // don't accept more words if there are too many words to flush
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@ -171,7 +173,10 @@ public final class transferRWI {
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sb.getLog().logInfo("Received " + received + " Words [" + wordhashes[0] + " .. " + wordhashes[received - 1] + "]/" + avdist + " from " + otherPeerName + ", processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, requesting " + unknownURL.size() + " URLs");
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}
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result = "ok";
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pause = (sb.wordIndex.kSize() < 500) ? 0 : 60 * sb.wordIndex.kSize(); // estimation of necessary pause time
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if (checkLimit) {
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pause = (sb.wordIndex.kSize() < 500) ? 0 : 60 * sb.wordIndex.kSize(); // estimation of necessary pause time
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}
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}
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prop.put("unknownURL", unknownURLs.toString());
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@ -258,13 +258,14 @@ public class plasmaDHTTransfer extends Thread {
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if (transferRWIResult != null && transferRWIResult.containsKey("pause")) {
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String pauseStr = (String) transferRWIResult.get("pause");
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try { pause = Integer.valueOf(pauseStr).intValue(); } catch (NumberFormatException numEx){}
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if (pause <= 0) pause = 60000;
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if (pause < 0) pause = 60000;
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else if (pause > 1800000) pause = 1800000;
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}
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return pause;
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}
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private void pause(long sleepTime) throws InterruptedException {
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if (sleepTime == 0) return;
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long sleepCounter = sleepTime / 1000;
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long sleepRest = sleepTime % 1000;
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while (!this.isAborted() && sleepCounter > 0) {
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@ -649,6 +649,14 @@ indexDistribution.minChunkSize = 5
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indexDistribution.maxChunkSize = 1000
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indexDistribution.startChunkSize = 50
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# defines if the peer should reject incoming index transfer
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# request if a given limit is reached
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indexDistribution.dhtReceiptLimitEnabled = false
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# defines the word cache for DHT reaches this level
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# the peer reports itself as busy
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indexDistribution.dhtReceiptLimit = 1000
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# Distribution of Citation-Reference (CR-) files
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# The distribution is done in two steps:
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# first step to anonymize the records
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