Cross-Compiled Linux From Scratch - Embedded - Version GIT-20190419-arm

Chapter 8. Beyond CLFS Embedded

8.6. Dropbear-2013.60

Dropbear is a relatively small SSH server and client. Dropbear has a small memory footprint suitable for memory-constrained environments, while still having the same features as OpenSSH. It does not depend on OpenSSL and it has a MIT style license.

Dropbear depends on zlib.

8.6.1. Installation of Dropbear

Fix dropbear so it doesn't install man pages: 

sed -i 's/.*mandir.*//g' Makefile.in

Configure dropbear: 

CC="${CC} -Os" ./configure --prefix=/usr --host=${CLFS_TARGET}
[Note]

Note

We are just telling dropbear to use the default configuration plus scp. For those who are more adventurous, edit options.h to further configure dropbear.

Compile the package: 

make MULTI=1 \
  PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"

Install the package: 

make MULTI=1 \
  PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" \
  install DESTDIR=${CLFS}/targetfs

Create the directory for the dropbear key files: 

install -dv ${CLFS}/targetfs/etc/dropbear

8.6.2. Installation of Dropbear Bootscripts

From the clfs-bootscripts package, install the Dropbear bootscripts: 

make install-dropbear DESTDIR=${CLFS}/targetfs

8.6.3. Contents of Dropbear

Installed programs: /usr/bin/dropbearmulti