Copyright (c) 2009-2010 Satoshi Nakamoto Copyright (c) 2011 Bitcoin Developers 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 # Headless bitcoin See readme-qt.rst for instructions on building Bitcoin QT, the graphical bitcoin. Dependencies ------------ Library Purpose Description ------- ------- ----------- libssl SSL Support Secure communications libdb4.8 Berkeley DB Blockchain & wallet storage libboost Boost C++ Library miinupnpc UPnP Support Optional firewall-jumping support miniupnpc may be used 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: 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 Berkeley DB 4.8.30.NC Boost 1.37 miniupnpc 1.6 Dependency Build Instructions: Ubuntu & Debian ---------------------------------------------- sudo apt-get install build-essential 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. Dependency Build Instructions: Gentoo ------------------------------------- emerge -av net-libs/miniupnpc boost openssl sys-libs/db Then take the following steps to build: cd ${BITCOIN_DIR}/src sed -i 's///' * sed -i 's/-Bstatic/-Bdynamic/' makefile.unix make -f makefile.unix strip bitcoind 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 ----------- 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.