Install Bitcoin Core to Debian Wheezy

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UNIX BUILD NOTES
====================
Some notes on how to build Bitcoin in Unix.

To Build
---------------------

./autogen.sh
./configure
make

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

Dependencies
---------------------

Library | Purpose | Description
------------|------------------|----------------------
libssl | SSL Support | Secure communications
libdb4.8 | Berkeley DB | Wallet storage
libboost | Boost | C++ Library
miniupnpc | UPnP Support | Optional firewall-jumping support
qt | GUI | GUI toolkit
protobuf | Payments in GUI | Data interchange format used for payment protocol
libqrencode | QR codes in GUI | Optional for generating QR codes

[miniupnpc](http://miniupnp.free.fr/) may be used for UPnP port mapping. It can be downloaded from [here](
http://miniupnp.tuxfamily.org/files/). 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

Licenses of statically linked libraries:
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

- For the versions used in the release, see doc/release-process.md under *Fetch and build inputs*.

System requirements
--------------------

C++ compilers are memory-hungry. It is recommended to have at least 1 GB of
memory available when compiling Bitcoin Core. With 512MB of memory or less
compilation will take much longer due to swap thrashing.

Dependency Build Instructions: Ubuntu & Debian
----------------------------------------------
Build requirements:

sudo apt-get install build-essential
sudo apt-get install libtool autotools-dev autoconf
sudo apt-get install libssl-dev

for Ubuntu 12.04 and later:

sudo apt-get install libboost-all-dev

db4.8 packages are available [here](https://launchpad.net/~bitcoin/+archive/bitcoin).
You can add the repository using the following command:

sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update

Ubuntu 12.04 and later have packages for libdb5.1-dev and libdb5.1++-dev,
but using these will break binary wallet compatibility, and is not recommended.

for Debian 7 (Wheezy) and later:
The oldstable repository contains db4.8 packages.
Add the following line to /etc/apt/sources.list,
replacing [mirror] with any official debian mirror.

deb http://[mirror]/debian/ oldstable main

To enable the change run

sudo apt-get update

for other Ubuntu & Debian:

sudo apt-get install libdb4.8-dev
sudo apt-get install libdb4.8++-dev

Optional:

sudo apt-get install libminiupnpc-dev (see --with-miniupnpc and --enable-upnp-default)

Dependencies for the GUI: Ubuntu & Debian
-----------------------------------------

If you want to build Bitcoin-Qt, make sure that the required packages for Qt development
are installed. Either Qt 4 or Qt 5 are necessary to build the GUI.
If both Qt 4 and Qt 5 are installed, Qt 4 will be used. Pass `--with-gui=qt5` to configure to choose Qt5.
To build without GUI pass `--without-gui`.

To build with Qt 4 you need the following:

sudo apt-get install libqt4-dev libprotobuf-dev protobuf-compiler

For Qt 5 you need the following:

sudo apt-get install libqt5gui5 libqt5core5 libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev

libqrencode (optional) can be installed with:

sudo apt-get install libqrencode-dev

Once these are installed, they will be found by configure and a bitcoin-qt executable will be
built by default.

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


miniupnpc
---------
tar -xzvf miniupnpc-1.6.tar.gz
cd miniupnpc-1.6
make
sudo su
make install


Berkeley DB
-----------
It is recommended to use Berkeley DB 4.8. If you have to build it yourself:

```bash
BITCOIN_ROOT=$(pwd)

# Pick some path to install BDB to, here we create a directory within the bitcoin directory
BDB_PREFIX="${BITCOIN_ROOT}/db4"
mkdir -p $BDB_PREFIX

# Fetch the source and verify that it is not tampered with
wget 'http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz';
echo '12edc0df75bf9abd7f82f821795bcee50f42cb2e5f76a6a281b85732798364ef db-4.8.30.NC.tar.gz' | sha256sum -c
# -> db-4.8.30.NC.tar.gz: OK
tar -xzvf db-4.8.30.NC.tar.gz

# Build the library and install to our prefix
cd db-4.8.30.NC/build_unix/
# Note: Do a static build so that it can be embedded into the exectuable, instead of having to find a .so at runtime
../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX
make install

# Configure Bitcoin Core to use our own-built instance of BDB
cd $BITCOIN_ROOT
./configure (other args...) LDFLAGS="-L${BDB_PREFIX}/lib/" CPPFLAGS="-I${BDB_PREFIX}/include/"
```

**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 bitcoin 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. 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 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.

Disable-wallet mode
--------------------
When the intention is to run only a P2P node without a wallet, bitcoin 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`.