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lbcd/sample-btcd.conf
Olaoluwa Osuntokun 0029905d43 Integrate a valid ECDSA signature cache into btcd 
Introduce an ECDSA signature verification into btcd in order to
mitigate a certain DoS attack and as a performance optimization.

The benefits of SigCache are two fold. Firstly, usage of SigCache
mitigates a DoS attack wherein an attacker causes a victim's client to
hang due to worst-case behavior triggered while processing attacker
crafted invalid transactions. A detailed description of the mitigated
DoS attack can be found here: https://bitslog.wordpress.com/2013/01/23/fixed-bitcoin-vulnerability-explanation-why-the-signature-cache-is-a-dos-protection/
Secondly, usage of the SigCache introduces a signature verification
optimization which speeds up the validation of transactions within a
block, if they've already been seen and verified within the mempool.

The server itself manages the sigCache instance. The blockManager and
txMempool respectively now receive pointers to the created sigCache
instance. All read (sig triplet existence) operations on the sigCache
will not block unless a separate goroutine is adding an entry (writing)
to the sigCache. GetBlockTemplate generation now also utilizes the
sigCache in order to avoid unnecessarily double checking signatures
when generating a template after previously accepting a txn to the
mempool. Consequently, the CPU miner now also employs the same
optimization.

The maximum number of entries for the sigCache has been introduced as a
config parameter in order to allow users to configure the amount of
memory consumed by this new additional caching.
2015-10-08 17:31:42 -07:00

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[Application Options]
; ------------------------------------------------------------------------------
; Data settings
; ------------------------------------------------------------------------------
; The directory to store data such as the block chain and peer addresses. The
; block chain takes several GB, so this location must have a lot of free space.
; The default is ~/.btcd/data on POSIX OSes, $LOCALAPPDATA/Btcd/data on Windows,
; ~/Library/Application Support/Btcd/data on Mac OS, and $home/btcd/data on
; Plan9. Environment variables are expanded so they may be used. NOTE: Windows
; environment variables are typically %VARIABLE%, but they must be accessed with
; $VARIABLE here. Also, ~ is expanded to $LOCALAPPDATA on Windows.
; datadir=~/.btcd/data
; ------------------------------------------------------------------------------
; Network settings
; ------------------------------------------------------------------------------
; Use testnet.
; testnet=1
; Connect via a SOCKS5 proxy. NOTE: Specifying a proxy will disable listening
; for incoming connections unless listen addresses are provided via the 'listen'
; option.
; proxy=127.0.0.1:9050
; proxyuser=
; proxypass=
; The SOCKS5 proxy above is assumed to be Tor (https://www.torproject.org).
; If the proxy is not tor the following may be used to prevent using tor
; specific SOCKS queries to lookup addresses (this increases anonymity when tor
; is used by preventing your IP being leaked via DNS).
; noonion=1
; Use an alternative proxy to connect to .onion addresses. The proxy is assumed
; to be a Tor node. Non .onion addresses will be contacted with the main proxy
; or without a proxy if none is set.
; onion=127.0.0.1:9051
; onionuser=
; onionpass=
; Enable Tor stream isolation by randomizing proxy user credentials resulting in
; Tor creating a new circuit for each connection. This makes it more difficult
; to correlate connections.
; torisolation=1
; Use Universal Plug and Play (UPnP) to automatically open the listen port
; and obtain the external IP address from supported devices. NOTE: This option
; will have no effect if exernal IP addresses are specified.
; upnp=1
; Specify the external IP addresses your node is listening on. One address per
; line. btcd will not contact 3rd-party sites to obtain external ip addresses.
; This means if you are behind NAT, your node will not be able to advertise a
; reachable address unless you specify it here or enable the 'upnp' option (and
; have a supported device).
; externalip=1.2.3.4
; externalip=2002::1234
; ******************************************************************************
; Summary of 'addpeer' versus 'connect'.
;
; Only one of the following two options, 'addpeer' and 'connect', may be
; specified. Both allow you to specify peers that you want to stay connected
; with, but the behavior is slightly different. By default, btcd will query DNS
; to find peers to connect to, so unless you have a specific reason such as
; those described below, you probably won't need to modify anything here.
;
; 'addpeer' does not prevent connections to other peers discovered from
; the peers you are connected to and also lets the remote peers know you are
; available so they can notify other peers they can to connect to you. This
; option might be useful if you are having problems finding a node for some
; reason (perhaps due to a firewall).
;
; 'connect', on the other hand, will ONLY connect to the specified peers and
; no others. It also disables listening (unless you explicitly set listen
; addresses via the 'listen' option) and DNS seeding, so you will not be
; advertised as an available peer to the peers you connect to and won't accept
; connections from any other peers. So, the 'connect' option effectively allows
; you to only connect to "trusted" peers.
; ******************************************************************************
; Add persistent peers to connect to as desired. One peer per line.
; You may specify each IP address with or without a port. The default port will
; be added automatically if one is not specified here.
; addpeer=192.168.1.1
; addpeer=10.0.0.2:8333
; addpeer=fe80::1
; addpeer=[fe80::2]:8333
; Add persistent peers that you ONLY want to connect to as desired. One peer
; per line. You may specify each IP address with or without a port. The
; default port will be added automatically if one is not specified here.
; NOTE: Specifying this option has other side effects as described above in
; the 'addpeer' versus 'connect' summary section.
; connect=192.168.1.1
; connect=10.0.0.2:8333
; connect=fe80::1
; connect=[fe80::2]:8333
; Maximum number of inbound and outbound peers.
; maxpeers=125
; How long to ban misbehaving peers. Valid time units are {s, m, h}.
; Minimum 1s.
; banduration=24h
; banduration=11h30m15s
; Disable DNS seeding for peers. By default, when btcd starts, it will use
; DNS to query for available peers to connect with.
; nodnsseed=1
; Specify the interfaces to listen on. One listen address per line.
; NOTE: The default port is modified by some options such as 'testnet', so it is
; recommended to not specify a port and allow a proper default to be chosen
; unless you have a specific reason to do otherwise.
; All interfaces on default port (this is the default):
; listen=
; All ipv4 interfaces on default port:
; listen=0.0.0.0
; All ipv6 interfaces on default port:
; listen=::
; All interfaces on port 8333:
; listen=:8333
; All ipv4 interfaces on port 8333:
; listen=0.0.0.0:8333
; All ipv6 interfaces on port 8333:
; listen=[::]:8333
; Only ipv4 localhost on port 8333:
; listen=127.0.0.1:8333
; Only ipv6 localhost on port 8333:
; listen=[::1]:8333
; Only ipv4 localhost on non-standard port 8336:
; listen=127.0.0.1:8336
; All interfaces on non-standard port 8336:
; listen=:8336
; All ipv4 interfaces on non-standard port 8336:
; listen=0.0.0.0:8336
; All ipv6 interfaces on non-standard port 8336:
; listen=[::]:8336
; Disable listening for incoming connections. This will override all listeners.
; nolisten=1
; Disable peer bloom filtering. See BIP0111.
; nopeerbloomfilters=1
; ------------------------------------------------------------------------------
; RPC server options - The following options control the built-in RPC server
; which is used to control and query information from a running btcd process.
;
; NOTE: The RPC server is disabled by default if rpcuser AND rpcpass, or
; rpclimituser AND rpclimitpass, are not specified.
; ------------------------------------------------------------------------------
; Secure the RPC API by specifying the username and password. You can also
; specify a limited username and password. You must specify at least one
; full set of credentials - limited or admin - or the RPC server will
; be disabled.
; rpcuser=whatever_admin_username_you_want
; rpcpass=
; rpclimituser=whatever_limited_username_you_want
; rpclimitpass=
; Specify the interfaces for the RPC server listen on. One listen address per
; line. NOTE: The default port is modified by some options such as 'testnet',
; so it is recommended to not specify a port and allow a proper default to be
; chosen unless you have a specific reason to do otherwise. By default, the
; RPC server will only listen on localhost for IPv4 and IPv6.
; All interfaces on default port:
; rpclisten=
; All ipv4 interfaces on default port:
; rpclisten=0.0.0.0
; All ipv6 interfaces on default port:
; rpclisten=::
; All interfaces on port 8334:
; rpclisten=:8334
; All ipv4 interfaces on port 8334:
; rpclisten=0.0.0.0:8334
; All ipv6 interfaces on port 8334:
; rpclisten=[::]:8334
; Only ipv4 localhost on port 8334:
; rpclisten=127.0.0.1:8334
; Only ipv6 localhost on port 8334:
; rpclisten=[::1]:8334
; Only ipv4 localhost on non-standard port 8337:
; rpclisten=127.0.0.1:8337
; All interfaces on non-standard port 8337:
; rpclisten=:8337
; All ipv4 interfaces on non-standard port 8337:
; rpclisten=0.0.0.0:8337
; All ipv6 interfaces on non-standard port 8337:
; rpclisten=[::]:8337
; Specify the maximum number of concurrent RPC clients for standard connections.
; rpcmaxclients=10
; Specify the maximum number of concurrent RPC websocket clients.
; rpcmaxwebsockets=25
; Use the following setting to disable the RPC server even if the rpcuser and
; rpcpass are specified above. This allows one to quickly disable the RPC
; server without having to remove credentials from the config file.
; norpc=1
; Use the following setting to disable TLS for the RPC server. NOTE: This
; option only works if the RPC server is bound to localhost interfaces (which is
; the default).
; notls=1
; ------------------------------------------------------------------------------
; Mempool Settings - The following options
; ------------------------------------------------------------------------------
; Rate-limit free transactions to the value 15 * 1000 bytes per
; minute.
; limitfreerelay=15
; Require high priority for relaying free or low-fee transactions.
; norelaypriority=0
; Limit orphan transaction pool to 1000 transactions.
; maxorphantx=1000
; ------------------------------------------------------------------------------
; Optional Transaction Indexes
; ------------------------------------------------------------------------------
; Build and maintain a full address-based transaction index.
; addrindex=1
; Delete the entire address index on start up, then exit.
; dropaddrindex=0
; ------------------------------------------------------------------------------
; Signature Verification Cache
; ------------------------------------------------------------------------------
; Limit the signature cache to a max of 50000 entries.
; sigcachemaxsize=50000
; ------------------------------------------------------------------------------
; Coin Generation (Mining) Settings - The following options control the
; generation of block templates used by external mining applications through RPC
; calls as well as the built-in CPU miner (if enabled).
; ------------------------------------------------------------------------------
; Enable built-in CPU mining.
;
; NOTE: This is typically only useful for testing purposes such as testnet or
; simnet since the difficutly on mainnet is far too high for CPU mining to be
; worth your while.
; generate=false
; Add addresses to pay mined blocks to for CPU mining and the block templates
; generated for the getwork RPC as desired. One address per line.
; miningaddr=1yourbitcoinaddress
; miningaddr=1yourbitcoinaddress2
; miningaddr=1yourbitcoinaddress3
; Specify the minimum block size in bytes to create. By default, only
; transactions which have enough fees or a high enough priority will be included
; in generated block templates. Specifying a minimum block size will instead
; attempt to fill generated block templates up with transactions until it is at
; least the specified number of bytes.
; blockminsize=0
; Specify the maximum block size in bytes to create. This value will be limited
; to the consensus limit if it is larger than that value.
; blockmaxsize=750000
; Specify the size in bytes of the high-priority/low-fee area when creating a
; block. Transactions which consist of large amounts, old inputs, and small
; sizes have the highest priority. One consequence of this is that as low-fee
; or free transactions age, they raise in priority thereby making them more
; likely to be included in this section of a new block. This value is limited
; by the blackmaxsize option and will be limited as needed.
; blockprioritysize=50000
; ------------------------------------------------------------------------------
; Debug
; ------------------------------------------------------------------------------
; Debug logging level.
; Valid levels are {trace, debug, info, warn, error, critical}
; You may also specify <subsystem>=<level>,<subsystem2>=<level>,... to set
; log level for individual subsystems. Use btcd --debuglevel=show to list
; available subsystems.
; debuglevel=info
; The port used to listen for HTTP profile requests. The profile server will
; be disabled if this option is not specified. The profile information can be
; accessed at http://localhost:<profileport>/debug/pprof once running.
; profile=6061
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