0029905d43
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.
115 lines
6.6 KiB
Go
115 lines
6.6 KiB
Go
// Copyright (c) 2013-2014 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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/*
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btcd is a full-node bitcoin implementation written in Go.
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The default options are sane for most users. This means btcd will work 'out of
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the box' for most users. However, there are also a wide variety of flags that
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can be used to control it.
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The following section provides a usage overview which enumerates the flags. An
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interesting point to note is that the long form of all of these options
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(except -C) can be specified in a configuration file that is automatically
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parsed when btcd starts up. By default, the configuration file is located at
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~/.btcd/btcd.conf on POSIX-style operating systems and %LOCALAPPDATA%\btcd\btcd.conf
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on Windows. The -C (--configfile) flag, as shown below, can be used to override
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this location.
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Usage:
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btcd [OPTIONS]
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Application Options:
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-V, --version Display version information and exit
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-C, --configfile= Path to configuration file
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-b, --datadir= Directory to store data
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--logdir= Directory to log output.
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-a, --addpeer= Add a peer to connect with at startup
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--connect= Connect only to the specified peers at startup
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--nolisten Disable listening for incoming connections -- NOTE:
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Listening is automatically disabled if the --connect
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or --proxy options are used without also specifying
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listen interfaces via --listen
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--listen= Add an interface/port to listen for connections
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(default all interfaces port: 8333, testnet: 18333)
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--maxpeers= Max number of inbound and outbound peers (125)
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--banduration= How long to ban misbehaving peers. Valid time units
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are {s, m, h}. Minimum 1 second (24h0m0s)
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-u, --rpcuser= Username for RPC connections
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-P, --rpcpass= Password for RPC connections
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--rpclimituser= Username for limited RPC connections
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--rpclimitpass= Password for limited RPC connections
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--rpclisten= Add an interface/port to listen for RPC connections
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(default port: 8334, testnet: 18334)
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--rpccert= File containing the certificate file
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--rpckey= File containing the certificate key
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--rpcmaxclients= Max number of RPC clients for standard connections
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(10)
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--rpcmaxwebsockets= Max number of RPC websocket connections (25)
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--norpc Disable built-in RPC server -- NOTE: The RPC server
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is disabled by default if no rpcuser/rpcpass or
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rpclimituser/rpclimitpass is specified
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--notls Disable TLS for the RPC server -- NOTE: This is only
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allowed if the RPC server is bound to localhost
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--nodnsseed Disable DNS seeding for peers
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--externalip= Add an ip to the list of local addresses we claim to
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listen on to peers
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--proxy= Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)
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--proxyuser= Username for proxy server
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--proxypass= Password for proxy server
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--onion= Connect to tor hidden services via SOCKS5 proxy
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(eg. 127.0.0.1:9050)
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--onionuser= Username for onion proxy server
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--onionpass= Password for onion proxy server
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--noonion Disable connecting to tor hidden services
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--torisolation Enable Tor stream isolation by randomizing user
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credentials for each connection.
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--testnet Use the test network
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--regtest Use the regression test network
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--simnet Use the simulation test network
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--nocheckpoints Disable built-in checkpoints. Don't do this unless
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you know what you're doing.
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--dbtype= Database backend to use for the Block Chain
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(leveldb)
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--profile= Enable HTTP profiling on given port -- NOTE port
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must be between 1024 and 65536
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--cpuprofile= Write CPU profile to the specified file
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-d, --debuglevel= Logging level for all subsystems {trace, debug,
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info, warn, error, critical} -- You may also specify
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<subsystem>=<level>,<subsystem2>=<level>,... to set
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the log level for individual subsystems -- Use show
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to list available subsystems (info)
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--upnp Use UPnP to map our listening port outside of NAT
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--limitfreerelay= Limit relay of transactions with no transaction fee
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to the given amount in thousands of bytes per
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minute (15)
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--norelaypriority Do not require free or low-fee transactions to have
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high priority for relaying
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--maxorphantx= Max number of orphan transactions to keep in memory
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(1000)
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--generate Generate (mine) bitcoins using the CPU
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--miningaddr= Add the specified payment address to the list of
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addresses to use for generated blocks -- At least
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one address is required if the generate option is
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set
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--blockminsize= Mininum block size in bytes to be used when creating
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a block
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--blockmaxsize= Maximum block size in bytes to be used when creating
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a block (750000)
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--blockprioritysize= Size in bytes for high-priority/low-fee transactions
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when creating a block (50000)
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--getworkkey= DEPRECATED -- Use the --miningaddr option instead
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--addrindex Build and maintain a full address index. Currently
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only supported by leveldb.
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--dropaddrindex Deletes the address-based transaction index from the
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database on start up, and the exits.
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--nopeerbloomfilters Disable bloom filtering support.
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--sigcachemaxsize= The maximum number of entries in the signature
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verification cache.
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Help Options:
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-h, --help Show this help message
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*/
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package main
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