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README.md

Arqma Network

Copyright (c) 2018-2019 The Arqma Network.
Copyright (c) 2014-2018 The Monero Project.
Portions Copyright (c) 2012-2013 The Cryptonote developers.

Development resources

Other Arqma related websites

Arqma Social-Media Websites

Arqma Exchange Websites

Introduction

Arqma is a private, secure, untraceable, decentralised digital currency. You are your bank, you control your funds, and nobody can trace your transfers unless you allow them to do so.

Privacy: Arqma uses a cryptographically sound system to allow you to send and receive funds without your transactions being easily revealed on the blockchain (the ledger of transactions that everyone has). This ensures that your purchases, receipts, and all transfers remain absolutely private by default.

Security: Using the power of a distributed peer-to-peer consensus network, every transaction on the network is cryptographically secured. Individual wallets have a 25 word mnemonic seed that is only displayed once, and can be written down to backup the wallet. Wallet files are encrypted with a passphrase to ensure they are useless if stolen.

Untraceability: By taking advantage of ring signatures, a special property of a certain type of cryptography, Arqma is able to ensure that transactions are not only untraceable, but have an optional measure of ambiguity that ensures that transactions cannot easily be tied back to an individual user or computer.

SSL

As a network, Arqma supports complete, cryptographically secured connections at all levels. This includes, but is not limited to Arqma Network Nodes (Full nodes), Remote Nodes and all wallets - CLI and GUI for desktop, and Android and iOS [ iOS is under development].

Arqma Network will be consistently implementing the highest security protocols to achieve the greatest privacy for all transactions, as well as all communications made over the Arqma Network.

The use of SSL connections means that there will not be any possibility to use the Arqma Network with unsecured or tampered connections (daemons), and that your privacy will remain a feature built in a protocol level.

  • Below is an example how to generate SSL Keys with openssl

    $ openssl genrsa -out /tmp/KEY 4096
    $ openssl req -new -key /tmp/KEY -out /tmp/REQ
    $ openssl x509 -req -days 999999 -sha256 -in /tmp/REQ -signkey /tmp/KEY -out /tmp/CERT

  • Above example will generate 4096bit SSL Cert at /tmp (which can be changed)*

About this project

This is the core implementation of Arqma. It is open source and completely free to use without restrictions, except for those specified in the license agreement below. There are no restrictions on anyone creating an alternative implementation of Arqma that uses the protocol and network in a compatible manner.

As with many development projects, the repository on Github is considered to be the "staging" area for the latest changes. Before changes are merged into that branch on the main repository, they are tested by individual developers in their own branches, submitted as a pull request, and then subsequently tested by contributors who focus on testing and code reviews. That having been said, the repository should be carefully considered before using it in a production environment, unless there is a patch in the repository for a particular show-stopping issue you are experiencing. It is generally a better idea to use a tagged release for stability.

Anyone is welcome to contribute to Arqma's codebase! If you have a fix or code change, feel free to submit it as a pull request directly to the "master" branch. In cases where the change is relatively small or does not affect other parts of the codebase it may be merged in immediately by any one of the collaborators. On the other hand, if the change is particularly large or complex, it is expected that it will be discussed at length either well in advance of the pull request being submitted, or even directly on the pull request.

License

See LICENSE.

Contributing

If you want to help out, see CONTRIBUTING for a set of guidelines.

Compiling Arqma from source

Build

IMPORTANT

That build is from the master branch, which is used for active development and can be either unstable or incompatible with release software. Please compile release branches.

Status (branch: master): Build Status

Dependencies

The following table summarizes the tools and libraries required to build. A few of the libraries are also included in this repository (marked as "Vendored"). By default, the build uses the library installed on the system, and ignores the vendored sources. However, if no library is found installed on the system, then the vendored source will be built and used. The vendored sources are also used for statically-linked builds because distribution packages often include only shared library binaries (.so) but not static library archives (.a).

Dep Min. version Vendored Debian/Ubuntu pkg Arch pkg Fedora Optional Purpose
GCC 7.3.0 NO build-essential base-devel gcc NO
CMake 3.6.3 NO cmake cmake cmake NO
pkg-config any NO pkg-config base-devel pkgconf NO
Boost 1.62 NO libboost-all-dev boost boost-devel NO C++ libraries
OpenSSL basically any NO libssl-dev openssl openssl-devel NO sha256 sum
libzmq 3.0.0 NO libzmq3-dev zeromq cppzmq-devel NO ZeroMQ library
OpenPGM ???? NO libpgm-dev libpgm openpgm-devel NO For ZeroMQ
libnorm[2] ? NO libnorm-dev ` YES For ZeroMQ
libunbound 1.4.16 YES libunbound-dev unbound unbound-devel NO DNS resolver
libsodium ? NO libsodium-dev ? libsodium-devel NO Cryptography
libunwind any NO libunwind8-dev libunwind libunwind-devel YES Stack traces
liblzma any NO liblzma-dev xz xz-devel YES For libunwind
libreadline 6.3.0 NO libreadline6-dev readline readline-devel YES Input editing
ldns 1.6.17 NO libldns-dev ldns ldns-devel YES SSL toolkit
expat 1.1 NO libexpat1-dev expat expat-devel YES XML parsing
GTest 1.5 YES libgtest-dev[1] gtest gtest-devel YES Test suite
Doxygen any NO doxygen doxygen doxygen YES Documentation
Graphviz any NO graphviz graphviz graphviz YES Documentation
HIDAPI ? NO libhidapi-dev `` `` NO for Device
libusb-1.0 1.0 NO libusb-1.0-0-dev `` `` NO
libudev ? NO libudev-dev `` `` NO
protobuf ? NO protobuf-compiler `` `` NO serializing
libprotobuf-dev `` `` structured data

[1] On Debian/Ubuntu libgtest-dev only includes sources and headers. You must build the library binary manually. This can be done with the following command sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/ [2] libnorm-dev is needed if your zmq library was built with libnorm, and not needed otherwise

Debian / Ubuntu one liner for all dependencies

sudo apt update && sudo apt install build-essential cmake pkg-config libboost-all-dev libssl-dev libzmq3-dev libunbound-dev libsodium-dev libunwind8-dev liblzma-dev libreadline6-dev libldns-dev libexpat1-dev doxygen graphviz libpgm-dev libudev-dev libusb-1.0-0-dev libhidapi-dev protobuf-compiler libprotobuf-dev xsltproc gperf autoconf automake libtool-bin libprotobuf-c-dev

Install all dependencies at once on OSX:

brew update && brew install cmake pkg-config boost zmq libpgm unbound libsodium miniupnpc libunwind-headers xz readline ldns expat doxygen graphviz protobuf

Cloning the repository

Clone recursively to pull-in needed submodule(s):

$ git clone https://github.com/arqma/arqma

If you already have a repo cloned, initialize and update:

$ cd arqma && git checkout release-v0.4.0.0
$ git submodule init && git submodule update

Build instructions

Arqma uses the CMake build system and a top-level Makefile that invokes cmake commands as needed.

On Linux and OS X

  • Install the dependencies

  • Change to the root of the source code directory and build:

      `$ cd arqma && make`
    

    Optional: If your machine has several cores and enough memory, enable parallel build by running make -j<number of threads> instead of make. For this to be worthwhile, the machine should have one core and about 2GB of RAM available per thread.

    Note: If cmake can not find zmq.hpp file on OS X, installing zmq.hpp from https://github.com/zeromq/cppzmq to /usr/local/include should fix that error.

  • The resulting executables can be found in build/release/bin

  • Add PATH="$PATH:$HOME/arqma/build/release/bin" to .profile

  • Run Arqma with arqmad --detach

  • Optional: build and run the test suite to verify the binaries:

      make release-test
    

    NOTE: core_tests test may take a few hours to complete.

  • Optional: to build binaries suitable for debugging:

       make debug
    
  • Optional: to build statically-linked binaries:

       make release-static
    

Dependencies need to be built with -fPIC. Static libraries usually aren't, so you may have to build them yourself with -fPIC. Refer to their documentation for how to build them.

  • Optional: build documentation in doc/html (omit HAVE_DOT=YES if graphviz is not installed):

      HAVE_DOT=YES doxygen Doxyfile
    

On the Raspberry Pi

Tested on a Raspberry Pi Zero with a clean install of minimal Raspbian Stretch (2017-09-07 or later) from https://www.raspberrypi.org/downloads/raspbian/. If you are using Raspian Jessie, please see note in the following section.

  • apt-get update && apt-get upgrade to install all of the latest software

  • Install the dependencies for Arqma from the 'Debian' column in the table above.

  • Increase the system swap size:

	sudo /etc/init.d/dphys-swapfile stop  
	sudo nano /etc/dphys-swapfile  
	CONF_SWAPSIZE=1024  
	sudo /etc/init.d/dphys-swapfile start  
  • Clone arqma and checkout most recent release version:
  git clone https://github.com/arqma/arqma.git
	cd arqma

  • Build:
  make release
  • Wait 4-6 hours

  • The resulting executables can be found in build/release/bin

  • Add PATH="$PATH:$HOME/arqma/build/release/bin" to .profile

  • Run Arqma with arqmad --detach

  • You may wish to reduce the size of the swap file after the build has finished, and delete the boost directory from your home directory

Note for Raspbian Jessie users:

If you are using the older Raspbian Jessie image, compiling Arqma is a bit more complicated. The version of Boost available in the Debian Jessie repositories is too old to use with Arqma, and thus you must compile a newer version yourself. The following explains the extra steps, and has been tested on a Raspberry Pi 2 with a clean install of minimal Raspbian Jessie.

  • As before, apt-get update && apt-get upgrade to install all of the latest software, and increase the system swap size
	sudo /etc/init.d/dphys-swapfile stop  
	sudo nano /etc/dphys-swapfile  
	CONF_SWAPSIZE=1024  
	sudo /etc/init.d/dphys-swapfile start  
  • Then, install the dependencies for ArQmA except libunwind and libboost-all-dev

  • Install the latest version of boost (this may first require invoking apt-get remove --purge libboost* to remove a previous version if you're not using a clean install):

	cd  
	wget https://sourceforge.net/projects/boost/files/boost/1.68.0/boost_1_68_0.tar.bz2  
	tar xvfo boost_1_68_0.tar.bz2  
	cd boost_1_68_0  
	./bootstrap.sh  
	sudo ./b2  
  • Wait ~8 hours
	sudo ./bjam install

On Windows:

Binaries for Windows are built on Windows using the MinGW toolchain within MSYS2 environment. The MSYS2 environment emulates a POSIX system. The toolchain runs within the environment and cross-compiles binaries that can run outside of the environment as a regular Windows application.

Preparing the build environment

  1. Download and install the MSYS2 installer.

  2. Open the MSYS shell via the MSYS2 MSYS shortcut at Menu Start

  3. Update packages using pacman:

     pacman -Syu    
    
  4. Exit the MSYS shell using Alt+F4 or by clicking X at top-right corner. It is Very Important to do not exit to shell!!.

  5. Start MSYS2 MINGW64 from Menu Start

  6. Update packages again using pacman:

     pacman -Syu    
    
  7. Install dependencies:

    To build for 64-bit Windows:

     pacman -S git mingw-w64-x86_64-toolchain make mingw-w64-x86_64-cmake mingw-w64-x86_64-boost mingw-w64-x86_64-openssl mingw-w64-x86_64-zeromq mingw-w64-x86_64-libsodium mingw-w64-x86_64-hidapi protobuf-devel mingw-w64-x86_64-protobuf-c mingw-w64-x86_64-protobuf
    

Building

  • Download Arqma with command:

    git clone https://github.com/arqma/arqma

  • Change branch to last Release:

    cd arqma && git checkout release-v0.4.0.0

  • Activate and update submodules:

    git submodule init && git submodule update

  • If you are on a 64-bit system, run:

      make release-static-win
    
  • The resulting executables can be found in build/release/bin

  • Optional: to build Windows binaries suitable for debugging on a 64-bit system, run:

      make debug-static-win
    
  • The resulting executables can be found in build/debug/bin

*** Arqma does Not support 32-bit Windows anymore ***

On FreeBSD:

The project can be built from scratch by following instructions for Linux above. If you are running arqma in a jail you need to add the flag: allow.sysvipc=1 to your jail configuration, otherwise lmdb will throw the error message: Failed to open lmdb environment: Function not implemented.

We expect to add Arqma into the ports tree in the near future, which will aid in managing installations using ports or packages.

On OpenBSD:

OpenBSD < 6.2

This has been tested on OpenBSD 5.8.

You will need to add a few packages to your system. pkg_add db cmake gcc gcc-libs g++ miniupnpc gtest.

The doxygen and graphviz packages are optional and require the xbase set.

The Boost package has a bug that will prevent librpc.a from building correctly. In order to fix this, you will have to Build boost yourself from scratch. Follow the directions here (under "Building Boost"): https://github.com/bitcoin/bitcoin/blob/master/doc/build-openbsd.md

You will have to add the serialization, date_time, and regex modules to Boost when building as they are needed by Arqma.

To build: env CC=egcc CXX=eg++ CPP=ecpp DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/path/to/the/boost/you/built make release-static-64

OpenBSD >= 6.2

You will need to add a few packages to your system. pkg_add cmake miniupnpc zeromq libiconv.

The doxygen and graphviz packages are optional and require the xbase set.

Build the Boost library using clang. This guide is derived from: https://github.com/bitcoin/bitcoin/blob/master/doc/build-openbsd.md

We assume you are compiling with a non-root user and you have doas enabled.

Note: do not use the boost package provided by OpenBSD, as we are installing boost to /usr/local.

# Create boost building directory
mkdir ~/boost
cd ~/boost

# Fetch boost source
ftp -o boost_1_64_0.tar.bz2 https://netcologne.dl.sourceforge.net/project/boost/boost/1.64.0/boost_1_64_0.tar.bz2

# MUST output: (SHA256) boost_1_64_0.tar.bz2: OK
echo "7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332 boost_1_64_0.tar.bz2" | sha256 -c
tar xfj boost_1_64_0.tar.bz2

# Fetch and apply boost patches, required for OpenBSD
ftp -o boost_test_impl_execution_monitor_ipp.patch https://raw.githubusercontent.com/openbsd/ports/bee9e6df517077a7269ff0dfd57995f5c6a10379/devel/boost/patches/patch-boost_test_impl_execution_monitor_ipp
ftp -o boost_config_platform_bsd_hpp.patch https://raw.githubusercontent.com/openbsd/ports/90658284fb786f5a60dd9d6e8d14500c167bdaa0/devel/boost/patches/patch-boost_config_platform_bsd_hpp

# MUST output: (SHA256) boost_config_platform_bsd_hpp.patch: OK
echo "1f5e59d1154f16ee1e0cc169395f30d5e7d22a5bd9f86358f738b0ccaea5e51d boost_config_platform_bsd_hpp.patch" | sha256 -c
# MUST output: (SHA256) boost_test_impl_execution_monitor_ipp.patch: OK
echo "30cec182a1437d40c3e0bd9a866ab5ddc1400a56185b7e671bb3782634ed0206 boost_test_impl_execution_monitor_ipp.patch" | sha256 -c

cd boost_1_64_0
patch -p0 < ../boost_test_impl_execution_monitor_ipp.patch
patch -p0 < ../boost_config_platform_bsd_hpp.patch

# Start building boost
echo 'using clang : : c++ : <cxxflags>"-fvisibility=hidden -fPIC" <linkflags>"" <archiver>"ar" <striper>"strip"  <ranlib>"ranlib" <rc>"" : ;' > user-config.jam
./bootstrap.sh --without-icu --with-libraries=chrono,filesystem,program_options,system,thread,test,date_time,regex,serialization,locale --with-toolset=clang
./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" -sICONV_PATH=/usr/local
doas ./b2 -d0 runtime-link=shared threadapi=pthread threading=multi link=static variant=release --layout=tagged --build-type=complete --user-config=user-config.jam -sNO_BZIP2=1 -sICONV_PATH=/usr/local --prefix=/usr/local install

Build cppzmq

Build the cppzmq bindings.

We assume you are compiling with a non-root user and you have doas enabled.

# Create cppzmq building directory
mkdir ~/cppzmq
cd ~/cppzmq

# Fetch cppzmq source
ftp -o cppzmq-4.2.3.tar.gz https://github.com/zeromq/cppzmq/archive/v4.2.3.tar.gz

# MUST output: (SHA256) cppzmq-4.2.3.tar.gz: OK
echo "3e6b57bf49115f4ae893b1ff7848ead7267013087dc7be1ab27636a97144d373 cppzmq-4.2.3.tar.gz" | sha256 -c
tar xfz cppzmq-4.2.3.tar.gz

# Start building cppzmq
cd cppzmq-4.2.3
mkdir build
cd build
cmake ..
doas make install

Build arqma: env DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/usr/local make release-static

On Solaris:

The default Solaris linker can't be used, you have to install GNU ld, then run cmake manually with the path to your copy of GNU ld:

    mkdir -p build/release
    cd build/release
    cmake -DCMAKE_LINKER=/path/to/ld -D CMAKE_BUILD_TYPE=Release ../..
    cd ../..

Then you can run make as usual.

On Linux for Android (using docker):

    # Build image
    docker build -f utils/build_scripts/android32.Dockerfile -t arqma-android .
    # Create container
    docker create -it --name arqma-android arqma-android bash
    # Get binaries
    docker cp arqma-android:/opt/android/arqma/build/release/bin .

Building portable statically linked binaries

By default, in either dynamically or statically linked builds, binaries target the specific host processor on which the build happens and are not portable to other processors. Portable binaries can be built using the following targets:

  • make release-static-linux-x86_64 builds binaries on Linux on x86_64 portable across POSIX systems on x86_64 processors
  • make release-static-linux-i686 builds binaries on Linux on x86_64 or i686 portable across POSIX systems on i686 processors
  • make release-static-linux-armv8 builds binaries on Linux portable across POSIX systems on armv8 processors
  • make release-static-linux-armv7 builds binaries on Linux portable across POSIX systems on armv7 processors
  • make release-static-linux-armv6 builds binaries on Linux portable across POSIX systems on armv6 processors
  • make release-static-win64 builds binaries on 64-bit Windows portable across 64-bit Windows systems

Cross Compiling

You can also cross-compile Arqma static binaries on Linux for Windows and macOS with the depends system.

  • make depends target=x86_64-linux-gnu for 64-bit linux binaries.
  • make depends target=x86_64-w64-mingw32 for 64-bit windows binaries. Requires: python3 g++-mingw-w64-x86-64 wine1.6 bc
  • make depends target=x86_64-apple-darwin14 for macOS binaries. Requires: cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python3-dev curl libtiff-tools bsdmainutils libbz2-dev python3-setuptools
  • make depends target=i686-linux-gnu for 32-bit linux binaries. Requires: g++-multilib bc
  • make depends target=arm-linux-gnueabihf for armv7 binaries. Requires: g++-arm-linux-gnueabihf
  • make depends target=aarch64-linux-gnu for armv8 binaries. Requires: g++-aarch64-linux-gnu

*** For x86_64-apple-darwin14 you need to download SDK first ***

  • git clone -b arqma https://github.com/malbit/MacOSX-SDKs.git contrib/depends/SDKs

You can download SDK at https://github.com/malbit/MacOSX-SDKs/releases/download/MacOSX10.11.sdk.arqma/MacOSX10.11.sdk.tar.gz and unpack it and put to contrib/depends/SDKs

The required packages are the names for each toolchain on apt. Depending on your OS Distribution, they may have different names.

Using depends might also be easier to compile Arqma on Windows than using MSYS. Activate Windows Subsystem for Linux (WSL) with a distribution (for example Ubuntu), install the apt build-essentials and follow the depends steps as stated above.

Compability with older Linux Versions < GLIBC_2.25

  • make depends-compat target=x86_64-linux-gnu for 64-bit linux binaries.

Running arqmad

The build places the binary in bin/ sub-directory within the build directory from which cmake was invoked (repository root by default). To run in foreground:

./bin/arqmad

To list all available options, run ./bin/arqmad --help. Options can be specified either on the command line or in a configuration file passed by the --config-file argument. To specify an option in the configuration file, add a line with the syntax argumentname=value, where argumentname is the name of the argument without the leading dashes, for example log-level=1.

To run in background:

./bin/arqmad --log-file arqmad.log --detach

To run as a systemd service, copy arqmad.service to /etc/systemd/system/ and arqmad.conf to /etc/. The example service assumes that the user arqma exists and its home is the data directory specified in the example config.

If you're on Mac, you may need to add the --max-concurrency 1 option to arqma-wallet-cli, and possibly arqmad, if you get crashes refreshing.

Internationalization

See README.i18n.md.

Using Tor

There is a new, still experimental, integration with Tor. The feature allows connecting over IPv4 and Tor simultaneously - IPv4 is used for relaying blocks and relaying transactions received by peers whereas Tor is used solely for relaying transactions received over local RPC. This provides privacy and better protection against surrounding node (sybil) attacks.

While Arqma isn't made to integrate with Tor, it can be used wrapped with torsocks, by setting the following configuration parameters and environment variables:

  • --p2p-bind-ip 127.0.0.1 on the command line or p2p-bind-ip=127.0.0.1 in arqmad.conf to disable listening for connections on external interfaces.
  • --no-igd on the command line or no-igd=1 in arqmad.conf to disable IGD (UPnP port forwarding negotiation), which is pointless with Tor.
  • DNS_PUBLIC=tcp or DNS_PUBLIC=tcp://x.x.x.x where x.x.x.x is the IP of the desired DNS server, for DNS requests to go over TCP, so that they are routed through Tor. When IP is not specified, arqmad uses the default list of servers defined in src/common/dns_utils.cpp.
  • TORSOCKS_ALLOW_INBOUND=1 to tell torsocks to allow arqmad to bind to interfaces to accept connections from the wallet. On some Linux systems, torsocks allows binding to localhost by default, so setting this variable is only necessary to allow binding to local LAN/VPN interfaces to allow wallets to connect from remote hosts. On other systems, it may be needed for local wallets as well.
  • Do NOT pass --detach when running through torsocks with systemd, (see utils/systemd/arqmad.service for details).
  • If you use the wallet with a Tor daemon via the loopback IP (eg, 127.0.0.1:9050), then use --untrusted-daemon unless it is your own hidden service.

Example command line to start arqmad through Tor:

DNS_PUBLIC=tcp torsocks arqmad --p2p-bind-ip 127.0.0.1 --no-igd

Using Tor on Tails

TAILS ships with a very restrictive set of firewall rules. Therefore, you need to add a rule to allow this connection too, in addition to telling torsocks to allow inbound connections. Full example:

sudo iptables -I OUTPUT 2 -p tcp -d 127.0.0.1 -m tcp --dport 19994 -j ACCEPT
DNS_PUBLIC=tcp torsocks ./arqmad --p2p-bind-ip 127.0.0.1 --no-igd --rpc-bind-ip 127.0.0.1 \
    --data-dir /home/amnesia/Persistent/your/directory/to/the/blockchain

Debugging

This section contains general instructions for debugging failed installs or problems encountered with Arqma. First ensure you are running the latest version built from the Github repository.

Obtaining stack traces and core dumps on Unix systems

We generally use the tool gdb (GNU debugger) to provide stack trace functionality, and ulimit to provide core dumps in builds which crash or segfault.

  • To use gdb in order to obtain a stack trace for a build that has stalled:

Run the build.

Once it stalls, enter the following command:

gdb /path/to/arqmad `pidof arqmad`

Type thread apply all bt within gdb in order to obtain the stack trace

  • If however the core dumps or segfaults:

Enter ulimit -c unlimited on the command line to enable unlimited filesizes for core dumps

Enter echo core | sudo tee /proc/sys/kernel/core_pattern to stop cores from being hijacked by other tools

Run the build.

When it terminates with an output along the lines of "Segmentation fault (core dumped)", there should be a core dump file in the same directory as arqmad. It may be named just core, or core.xxxx with numbers appended.

You can now analyse this core dump with gdb as follows:

gdb /path/to/arqmad /path/to/dumpfile

Print the stack trace with bt

  • To run arqma within gdb:

Type gdb /path/to/arqmad

Pass command-line options with --args followed by the relevant arguments

Type run to run arqmad

Analysing memory corruption

We use the tool valgrind for this.

Run with valgrind /path/to/arqmad. It will be slow.

LMDB

Instructions for debugging suspected blockchain corruption as per @HYC

There is an mdb_stat command in the LMDB source that can print statistics about the database but it's not routinely built. This can be built with the following command:

cd ~/arqma/external/db_drivers/liblmdb && make

The output of mdb_stat -ea <path to blockchain dir> will indicate inconsistencies in the blocks, block_heights and block_info table.

The output of mdb_dump -s blocks <path to blockchain dir> and mdb_dump -s block_info <path to blockchain dir> is useful for indicating whether blocks and block_info contain the same keys.

These records are dumped as hex data, where the first line is the key and the second line is the data.

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