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Replace trickle nodes with per-node/message Poisson delays

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We used to have a trickle node, a node which was chosen in each iteration of
the send loop that was privileged and allowed to send out queued up non-time
critical messages. Since the removal of the fixed sleeps in the network code,
this resulted in fast and attackable treatment of such broadcasts.

This pull request changes the 3 remaining trickle use cases by random delays:
* Local address broadcast (while also removing the the wiping of the seen filter)
* Address relay
* Inv relay (for transactions; blocks are always relayed immediately)

The code is based on older commits by Patrick Strateman.
This commit is contained in:
Pieter Wuille
2015-04-08 11:20:00 -07:00
parent 9ee02cf564
commit 5400ef6bcb
5 changed files with 47 additions and 36 deletions
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11
src/main.h
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@@ -87,6 +87,14 @@ static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
/** Maximum length of reject messages. */
static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
/** Average delay between local address broadcasts in seconds. */
static const unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 24 * 60;
/** Average delay between peer address broadcasts in seconds. */
static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30;
/** Average delay between trickled inventory broadcasts in seconds.
* Blocks, whitelisted receivers, and a random 25% of transactions bypass this. */
static const unsigned int AVG_INVENTORY_BROADCAST_INTERVAL = 5;
static const unsigned int DEFAULT_LIMITFREERELAY = 15;
static const bool DEFAULT_RELAYPRIORITY = true;
@@ -197,9 +205,8 @@ bool ProcessMessages(CNode* pfrom);
* Send queued protocol messages to be sent to a give node.
*
* @param[in] pto The node which we are sending messages to.
* @param[in] fSendTrickle When true send the trickled data, otherwise trickle the data until true.
*/
bool SendMessages(CNode* pto, bool fSendTrickle);
bool SendMessages(CNode* pto);
/** Run an instance of the script checking thread */
void ThreadScriptCheck();
/** Try to detect Partition (network isolation) attacks against us */