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Copyright (c) 2009-2010 Satoshi Nakamoto
Distributed under the MIT/X11 software license, see the accompanying
file license.txt or http://www.opensource.org/licenses/mit-license.php.
This product includes software developed by the OpenSSL Project for use in
the OpenSSL Toolkit (http://www.openssl.org/). This product includes
cryptographic software written by Eric Young (eay@cryptsoft.com) and UPnP
software written by Thomas Bernard.
UNIX BUILD NOTES
================
To Build
--------
cd src/
make -f makefile.unix # Bitcoin with wxWidgets GUI
or
make -f makefile.unix bitcoind # Headless bitcoin
Dependencies
------------
sudo apt-get install build-essential
sudo apt-get install libgtk2.0-dev
sudo apt-get install libssl-dev
sudo apt-get install libdb4.8-dev
sudo apt-get install libdb4.8++-dev
Boost 1.40+: sudo apt-get install libboost-all-dev
or Boost 1.37: sudo apt-get install libboost1.37-dev
If using Boost 1.37, append -mt to the boost libraries in the makefile.
Requires wxWidgets 2.9.1 or newer.
You need to download wxWidgets from http://www.wxwidgets.org/downloads/
and build it yourself. See the build instructions and configure parameters
below.
Requires miniupnpc for UPnP port mapping. It can be downloaded from
http://miniupnp.tuxfamily.org/files/. UPnP support is compiled in and
turned off by default. Set USE_UPNP to a different value to control this:
USE_UPNP= no UPnP support, miniupnp not required;
USE_UPNP=0 (the default) UPnP support turned off by default at runtime;
USE_UPNP=1 UPnP support turned on by default at runtime.
Licenses of statically linked libraries:
wxWidgets LGPL 2.1 with very liberal exceptions
Berkeley DB New BSD license with additional requirement that linked software must be free open source
Boost MIT-like license
miniupnpc New (3-clause) BSD license
Versions used in this release:
GCC 4.3.3
OpenSSL 0.9.8g
wxWidgets 2.9.2
Berkeley DB 4.8.30.NC
Boost 1.37
miniupnpc 1.6
Notes
-----
The UI layout is edited with wxFormBuilder. The project file is
uiproject.fbp. It generates uibase.cpp and uibase.h, which define base
classes that do the rote work of constructing all the UI elements.
The release is built with GCC and then "strip bitcoin" to strip the debug
symbols, which reduces the executable size by about 90%.
wxWidgets
---------
cd /usr/local
tar -xzvf wxWidgets-2.9.2.tar.gz
cd wxWidgets-2.9.2
mkdir buildgtk
cd buildgtk
../configure --with-gtk --enable-debug --disable-shared --enable-monolithic --without-libpng --disable-svg
make
sudo su
make install
ldconfig
miniupnpc
---------
tar -xzvf miniupnpc-1.6.tar.gz
cd miniupnpc-1.6
make
sudo su
make install
Berkeley DB
-----------
You need Berkeley DB 4.8. If you have to build Berkeley DB yourself:
../dist/configure --enable-cxx
make
Boost
-----
If you need to build Boost yourself:
sudo su
./bootstrap.sh
./bjam install
Security
--------
To help make your bitcoin installation more secure by making certain attacks impossible to
exploit even if a vulnerability is found, you can take the following measures:
* Position Independent Executable
Build position independent code to take advantage of Address Space Layout Randomization
offered by some kernels. An attacker who is able to cause execution of code at an arbitrary
memory location is thwarted if he doesn'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 build with PIE, use:
make -f makefile.unix ... -e PIE=1
To test that you have built PIE executable, install scanelf, part of paxutils, and use:
scanelf -e ./bitcoin
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, bitcoin 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 ./bitcoin
the output should contain:
STK/REL/PTL
RW- R-- RW-
The STK RW- means that the stack is readable and writeable but not executable.
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