Darksend defaults to a new mode which enables inputs/outputs
of each session to be different. For example 10DRK can be input
and 1DRKx10 can be output. This strengthens the anonymity of
Darksend greatly, which also increasing the usability (Users who
run out of .1DRK denominations can simply turn on Darksend to
split up larger inputs).
This avoids a regression for issues like #334 where high speed
repeated connections eventually run the HTTP client out of
sockets because all of theirs end up in time_wait.
Maybe the trade-off here is suboptimal, but if both choices will
fail then we prefer fewer changes until the root cause is solved.
Rebased-From: 1a25a7edf87d2cb48511
Github-Pull: #5674
LiteMode disables Darksend/Masternodes/InstantX for clients
who want speed and don't need access to these features. UI
for Darksend is also hidden while in this mode.
It turns out that some miners have been staying with old versions of
Bitcoin Core because their software behaves poorly with persistent
connections and the Bitcoin Core thread and connection limits.
What happens is that underlying HTTP libraries leave connections open
invisibly to their users and then the user runs into the default four
thread limit. This looks like Bitcoin Core is unresponsive to RPC.
There are many things that should be improved in Bitcoin Core's behavior
here, e.g. supporting more concurrent connections, not tying up threads
for idle connections, disconnecting kept-alive connections when limits
are reached, etc. All are fairly big, risky changes.
Disabling keep-alive is a simple workaround. It's often not easy to turn
off the keep-alive support in the client where it may be buried in some
platform library.
If you are one of the few who really needs persistent connections you
probably know that you want them and can find a switch; while if you
don't and the misbehavior is hitting you it is hard to discover the
source of your problems is keepalive related. Given that it is best
to default to off until they're handled better.
Github-Merge: #5655
Rebased-From: 16a5c18cea56c1093dae1dd8ee72af
Crash was caused by Params() usage in CDarkSendPool::CDarkSendPool upon wallet start. I've moved init of the collateral address outside of the class to CDarkSendPool.InitCollateralAddress() instead.
More info regarding KeePass: http://keepass.info/
KeePass integration will use KeePassHttp (https://github.com/pfn/keepasshttp/) to facilitate communications between the client and KeePass. KeePassHttp is a plugin for KeePass 2.x and provides a secure means of exposing KeePass entries via HTTP for clients to consume.
The implementation is dependent on the following:
- crypter.h for AES encryption helper functions.
- rpcprotocol.h for handling RPC communications. Could only be used partially however due some static values in the code.
- OpenSSL for base64 encoding. regular util.h libraries were not used for base64 encoding/decoding since they do not use secure allocation.
- JSON Spirit for reading / writing RPC communications
The following changes were made:
- Added CLI options in help
- Added RPC commands: keepass <genkey|init|setpassphrase>
- Added keepass.h and keepass.cpp which hold the integration routines
- Modified rpcwallet.cpp to support RPC commands
The following new options are available for darkcoind and darkcoin-qt:
-keepass Use KeePass 2 integration using KeePassHttp plugin (default: 0)
-keepassport=<port> Connect to KeePassHttp on port <port> (default: 19455)
-keepasskey=<key> KeePassHttp key for AES encrypted communication with KeePass
-keepassid=<name> KeePassHttp id for the established association
-keepassname=<name> Name to construct url for KeePass entry that stores the wallet passphrase
The following rpc commands are available:
- keepass genkey: generates a base64 encoded 256 bit AES key that can be used for the communication with KeePassHttp. Only necessary for manual configuration. Use init for automatic configuration.
- keepass init: sets up the association between darkcoind and keepass by generating an AES key and sending an association message to KeePassHttp. This will trigger KeePass to ask for an Id for the association. Returns the association and the base64 encoded string for the AES key.
- keepass setpassphrase <passphrase>: updates the passphrase in KeePassHttp to a new value. This should match the passphrase you intend to use for the wallet. Please note that the standard RPC commands walletpassphrasechange and the wallet encrption from the QT GUI already send the updates to KeePassHttp, so this is only necessary for manual manipulation of the password.
Sample initialization flow from darkcoin-qt console (this needs to be done only once to set up the association):
- Have KeePass running with an open database
- Start darkcoin-qt
- Open console
- type: "keepass init" in darkcoin-qt console
- (keepass pops up and asks for an association id, fill that in). Example: mydrkwallet
- response: Association successful. Id: mydrkwalletdarkcoin - Key: AgQkcs6cI7v9tlSYKjG/+s8wJrGALHl3jLosJpPLzUE=
- Edit darkcoin.conf and fill in these values
keepass=1
keepasskey=AgQkcs6cI7v9tlSYKjG/+s8wJrGALHl3jLosJpPLzUE=
keepassid=mydrkwallet
keepassname=testwallet
- Restart darkcoin-qt
At this point, the association is made. The next action depends on your particular situation:
- current wallet is not yet encrypted. Encrypting the wallet will trigger the integration and stores the password in KeePass (Under the 'KeePassHttp Passwords' group, named after keepassname.
- current wallet is already encrypted: use "keepass setpassphrase <passphrase>" to store the passphrase in KeePass.
At this point, the passphrase is stored in KeePassHttp. When Unlocking the wallet, one can use keepass as the passphrase to trigger retrieval of the password. This works from the RPC commands as well as the GUI.
DoAutoDenomination just wrote to the debug.log and because of that users commonly would have a hard time seeing what was happening. This fixes that by setting a status and displaying that status in the overview.
Previously the minRelayTxFee was only enforced on user specified values.
It was possible for smartfee to produce a fee below minRelayTxFee which
would just result in the transaction getting stuck because it can't be
relayed.
This also introduces a maxtxfee option which sets an absolute maximum
for any fee created by the wallet, with an intention of increasing
user confidence that the automatic fees won't burn them. This was
frequently a concern even before smartfees.
If the configured fee policy won't even allow the wallet to meet the relay
fee the transaction creation may be aborted.
Rebased-From: aa279d6131
Github-Pull: #5485
