Skip to content

Latest commit

 

History

History
248 lines (168 loc) · 8.37 KB

build-unix.md

File metadata and controls

248 lines (168 loc) · 8.37 KB
Raw

UNIX/LINUX BUILD NOTES

Some notes on how to build Neurai in *nix.

Note

Always use absolute paths to configure and compile neurai and the dependencies, for example, when specifying the path of the dependency:

../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX

Here BDB_PREFIX must be an absolute path - it is defined using $(pwd) which ensures the usage of the absolute path.

To Build

./autogen.sh
./configure
make
make install # optional

This will build neurai-qt as well if the dependencies are met.

On most Linux distros the "fPIC" flag needs to be set. If this flag is not specified it is possible that the build will fail with an error similar to:

relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC

To resolve or avoid the following build error specify the following configure parameters, make clean, and then build:

./configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX CXXFLAGS="-fPIC" CPPFLAGS="-fPIC"
make clean
make

Dependencies

These dependencies are required:

Library Purpose Description
libssl Crypto Random Number Generation, Elliptic Curve Cryptography
libboost Utility Library for threading, data structures, etc
libevent Networking OS independent asynchronous networking
libdb++ Utility Contains headers and static libraries for the Berkeley DB library

Optional dependencies:

Library Purpose Description
miniupnpc UPnP Support Firewall-jumping support
libdb4.8 Berkeley DB Wallet storage (only needed when wallet enabled)
qt GUI GUI toolkit (only needed when GUI enabled)
protobuf Payments in GUI Data interchange format used for payment protocol (only needed when GUI enabled)
libqrencode QR codes in GUI Optional for generating QR codes (only needed when GUI enabled)
univalue Utility JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
libzmq3 ZMQ notification Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.x)

For the versions used, see dependencies.md

Linux Distribution Specific Instructions

Ubuntu & Debian

Ubuntu/Debian specific instructions, see build-ubuntu.md)

Fedora

Dependency Build Instructions

Build requirements:

sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3

Optional:

sudo dnf install miniupnpc-devel

ZMQ dependencies (provides ZMQ API):

sudo dnf install zeromq-devel

To build with Qt 5 you need the following:

sudo dnf install qt5-qttools-devel qt5-qtbase-devel protobuf-devel

libqrencode (optional) can be installed with:

sudo dnf install qrencode-devel

Notes

The release is built with GCC and then "strip neuraid" to strip the debug symbols, which reduces the executable size by about 90%.

miniupnpc

miniupnpc may be used for UPnP port mapping. It can be downloaded from here. UPnP support is compiled in and turned off by default. See the configure options for upnp behavior desired:

--without-miniupnpc      No UPnP support miniupnp not required
--disable-upnp-default   (the default) UPnP support turned off by default at runtime
--enable-upnp-default    UPnP support turned on by default at runtime

Berkeley DB

It is recommended to use Berkeley DB 4.8. If you want to build it yourself, we recommend using the install_db4.sh script

contrib/install_db4.sh

Note: You only need Berkeley DB if the wallet is enabled (see the section Disable-Wallet mode below).

Boost

If you need to build Boost yourself:

sudo su
./bootstrap.sh
./bjam install

Security

To help make your neurai installation more secure by making certain attacks impossible to exploit even if a vulnerability is found, binaries are hardened by default. This can be disabled with:

Hardening Flags:

./configure --enable-hardening
./configure --disable-hardening

Hardening enables the following features:

  • Position Independent Executable Build position independent code to take advantage of Address Space Layout Randomization offered by some kernels. Attackers who can cause execution of code at an arbitrary memory location are thwarted if they don't know where anything useful is located. The stack and heap are randomly located by default but this allows the code section to be randomly located as well.

    On an AMD64 processor where a library was not compiled with -fPIC, this will cause an error such as: "relocation R_X86_64_32 against `......' can not be used when making a shared object;"

    To test that you have built PIE executable, install scanelf, part of paxutils, and use:

      scanelf -e ./neurai

    The output should contain:

    TYPE ET_DYN

  • Non-executable Stack If the stack is executable then trivial stack based buffer overflow exploits are possible if vulnerable buffers are found. By default, neurai should be built with a non-executable stack but if one of the libraries it uses asks for an executable stack or someone makes a mistake and uses a compiler extension which requires an executable stack, it will silently build an executable without the non-executable stack protection.

    To verify that the stack is non-executable after compiling use: scanelf -e ./neurai

    the output should contain: STK/REL/PTL RW- R-- RW-

    The STK RW- means that the stack is readable and writeable but not executable.

Disable-wallet mode

When the intention is to run only a P2P node without a wallet, neurai may be compiled in disable-wallet mode with:

./configure --disable-wallet

In this case there is no dependency on Berkeley DB 4.8.

Mining is also possible in disable-wallet mode, but only using the getblocktemplate RPC call not getwork.

Additional Configure Flags

A list of additional configure flags can be displayed with:

./configure --help

Setup and Build Example: Arch Linux

This example lists the steps necessary to setup and build a command line only, non-wallet distribution of the latest changes on Arch Linux:

pacman -S git base-devel boost libevent python
git clone https://github.com/NeuraiProject/Neurai.git
cd neurai/
./autogen.sh
./configure --disable-wallet --without-gui --without-miniupnpc
make check

Note: Enabling wallet support requires either compiling against a Berkeley DB newer than 4.8 (package db) using --with-incompatible-bdb, or building and depending on a local version of Berkeley DB 4.8. The readily available Arch Linux packages are currently built using --with-incompatible-bdb according to the PKGBUILD. As mentioned above, when maintaining portability of the wallet between the standard Neurai distributions and independently built node software is desired, Berkeley DB 4.8 must be used.

ARM Cross-compilation

These steps can be performed on, for example, an Ubuntu VM. The depends system will also work on other Linux distributions, however the commands for installing the toolchain will be different.

Make sure you install the build requirements mentioned above. Then, install the toolchain and curl:

sudo apt-get install g++-arm-linux-gnueabihf curl

To build executables for ARM:

cd depends
make HOST=arm-linux-gnueabihf NO_QT=1
cd ..
./autogen.sh
./configure --prefix=$PWD/depends/arm-linux-gnueabihf --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++
make

For further documentation on the depends system see README.md in the depends directory.

Building on FreeBSD and OpenBSD

FreeBSD specific instructions, see build-freebsd.md)

OpenBSD specific instructions, see build-openbsd.md)