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How to compile statically linked OpenVPN client for ARMv5
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README.md

How to compile statically linked OpenVPN client for ARMv5

You need to install ARMv5 gcc cross compiler: apt-get install gcc-arm-linux-gnueabi

You have to define a directory (via --prefix) where all of your binaries will be installed (copied). In the guide I use the following: /home/user/vpn_compile

OpenSSL

  1. Download the source: wget https://www.openssl.org/source/openssl-1.0.2j.tar.gz
  2. Extract it and change the working directory: tar -xvf openssl-1.0.2j.tar.gz && cd openssl-1.0.2j
  3. Configure it: ./Configure gcc -static -no-shared --prefix=/home/user/vpn_compile --cross-compile-prefix=arm-linux-gnueabi-
  4. Compile: make
  5. Install: make install

LZO

  1. Download the source: wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.09.tar.gz
  2. Extract it and change the working directory: tar -xvf lzo-2.09.tar.gz && cd lzo-2.09
  3. Configure it: ./configure --prefix=/home/user/vpn_compile --enable-static --target=arm-linux-gnueabi --host=arm-linux-gnueabi --disable-debug
  4. Compile: make
  5. Install: make install

OpenVPN

  1. Download the source: wget https://swupdate.openvpn.org/community/releases/openvpn-2.3.12.tar.gz
  2. Extract it and change the working directory: tar -xvf openvpn-2.3.12.tar.gz && cd openvpn-2.3.12
  3. Configure it: ./configure --target=arm-linux-gnueabi --host=arm-linux-gnueabi --prefix=/home/user/vpn_compile --disable-server --enable-static --disable-shared --disable-debug --disable-plugins OPENSSL_SSL_LIBS="-L/home/user/vpn_compile/lib -lssl" OPENSSL_SSL_CFLAGS="-I/home/user/vpn_compile/include" OPENSSL_CRYPTO_LIBS="-L/home/user/vpn_compile/lib -lcrypto" OPENSSL_CRYPTO_CFLAGS="-I/home/user/vpn_compile/include" LZO_CFLAGS="-I/home/user/vpn_compile/include" LZO_LIBS="-L/home/user/vpn_compile/lib -llzo2"
  4. Compile: make LIBS="-all-static"
  5. Install: make install

Your OpenVPN client is here: /home/user/vpn_compile/sbin/openvpn

Make sure this is what you need:

$ file /home/user/vpn_compile/sbin/openvpn
/home/user/vpn_compile/sbin/openvpn: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, for GNU/Linux 3.2.0, BuildID[sha1]=e6fd2008c129fef90ed9826e3ffb9d53e83eb42c, not stripped

Versions

Build system:

$ uname -rm
4.4.0-45-generic x86_64
$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS"
$ arm-linux-gnueabi-gcc --version
arm-linux-gnueabi-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.1) 5.4.0 20160609

Target system:

$ uname -rm
3.2.34 armv5tejl
$ openvpn --version
OpenVPN 2.3.12 arm-unknown-linux-gnueabi [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Oct 27 2016
library versions: OpenSSL 1.0.2j  26 Sep 2016, LZO 2.09
Originally developed by James Yonan
Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <[email protected]>
Compile time defines: enable_crypto=yes enable_crypto_ofb_cfb=yes enable_debug=no enable_def_auth=yes enable_dlopen=unknown enable_dlopen_self=unknown enable_dlopen_self_static=unknown enable_fast_install=needless enable_fragment=yes enable_http_proxy=yes enable_iproute2=no enable_libtool_lock=yes enable_lzo=yes enable_lzo_stub=no enable_management=yes enable_multi=yes enable_multihome=yes enable_pam_dlopen=no enable_pedantic=no enable_pf=yes enable_pkcs11=no enable_plugin_auth_pam=no enable_plugin_down_root=no enable_plugins=no enable_port_share=yes enable_selinux=no enable_server=no enable_shared=no enable_shared_with_static_runtimes=no enable_small=no enable_socks=yes enable_ssl=yes enable_static=yes enable_strict=no enable_strict_options=no enable_systemd=no enable_win32_dll=yes enable_x509_alt_username=no with_crypto_library=openssl with_gnu_ld=yes with_mem_check=no with_plugindir='$(libdir)/openvpn/plugins' with_sysroot=no
@zoobab
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zoobab commented Jan 19, 2022

I did a cleanup, it works, sorry for the noise:

zoobab@vic /home/zoobab/sbin [34]$ ldd openvpn
        not a dynamic executable

@pepeteg
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pepeteg commented Apr 27, 2022

Hi!!

I have follow the steps but I have a dynamic library dependency for lz4:

otool -L openvpn
openvpn:
/usr/lib/libresolv.9.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/local/lib/liblz4.1.dylib (compatibility version 1.0.0, current version 1.9.2)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1311.100.3)

I am working in macOS.

I have checked the libraries and I have the static lz4 library:

ls -l liblz4*
-rwxr-xr-x 1 pepeteg staff 156987 25 abr 23:37 liblz4.1.9.2.dylib
lrwxr-xr-x 1 pepeteg staff 18 25 abr 23:37 liblz4.1.dylib -> liblz4.1.9.2.dylib
-rw-r--r-- 1 pepeteg staff 151800 25 abr 23:37 liblz4.a
lrwxr-xr-x 1 pepeteg staff 18 25 abr 23:37 liblz4.dylib -> liblz4.1.9.2.dylib

Please, could you tell me how you solved it?.

Thanks in advance.

Best regards

@thomasa88
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Not related to above comment, but this is how I managed to compile OpenVPN 2.5.5 for the Synology DS212j (a bit old).

Synology toolchains:
https://sourceforge.net/projects/dsgpl/files/Tool%20Chain
For DS212j:
https://deac-ams.dl.sourceforge.net/project/dsgpl/Tool%20Chain/DSM%206.2.4%20Tool%20Chains/Marvell%2088F628x%20Linux%202.6.32/6281-gcc464_glibc215_88f6281-GPL.txz

Synology 6.2.4, DS212j build

export TOOLCHAIN=$HOME/src/openvpn-synology/arm-marvell-linux-gnueabi
# find arm-marvell-linux-gnueabi/ -name '*crt1*'
export SYSROOT=$TOOLCHAIN/arm-marvell-linux-gnueabi/libc
# Not all tools are contained inside the sysroot, so cannot use that "gcc" etc
#export PATH=$SYSROOT/bin:$PATH
export PATH=$TOOLCHAIN/bin:$PATH
export PREFIX=$HOME/src/openvpn-synology/prefix
export HOST=arm-marvell-linux-gnueabi

openssl-1.1.1n:
./Configure gcc --cross-compile-prefix=${HOST}- -static -no-shared --prefix=$PREFIX --sysroot=$SYSROOT
make -j8
make install


lzo-2.10: # Needed if we want lzo compression
./configure --host $HOST CC=$TOOLCHAIN/bin/${HOST}-gcc --enable-static --prefix=$PREFIX LDFLAGS="--sysroot=$SYSROOT" CFLAGS="--sysroot=$SYSROOT"
make -j8
make install


openvpn-2.5.5:
# lz4 compression compat files kicks in automatically.
./configure --host=$HOST CC=$TOOLCHAIN/bin/${HOST}-gcc --prefix=$PREFIX --enable-static --disable-shared --disable-debug --disable-plugins --disable-unit-tests LDFLAGS="--sysroot=$SYSROOT -L$PREFIX/lib" CFLAGS="--sysroot=$SYSROOT" CPPFLAGS="-I$PREFIX/include" 

# Fails on "no module named docutils", but succeeds if run again..
make -j8 LIBS="-all-static"

make install

@locnnil
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locnnil commented Nov 11, 2022

@hanneshoettinger Go inside the configure script and search for the keyword: OPENSSL_CRYPTO_LIBS looks that this options is not properly configured.

I'm building version 2.5.8 and inside of my configure there is no OPENSSL_CRYPTO_LIBS or OPENSSL_CRYPTO_CFLAGS

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