HIP:TS-7000:dropbear

about

This page describes how to compile dropbear to run in Technologic System's TS-Linux distribution. We're using the TS-7260.

compiling

crosstool setup

download and setup ts crosstool package

• At the time of this writing, I downloaded Linux Crosstool gcc-4.0.1-glibc-2.3.5 -- unknown (05-20-2006)

ftp://ftp.embeddedarm.com/ts-arm-linux-cd/cross-toolchains/crosstool-linux-gcc-4.0.1-glibc-2.3.5.tar.bz2

move it to / and unpack it

cd /
sudo tar -xf crosstool-linux-gcc-4.0.1-glibc-2.3.5.tar

add it to your path

arm@crow:~$ cat ~/.bash_profile | grep cross
PATH=/opt/crosstool/gcc-4.0.1- glibc-2.3.5/arm-unknown-linux-gnu/bin:${PATH}

dropbear

download dropbear

• [dropbear home]

$ wget http://matt.ucc.asn.au/dropbear/releases/dropbear-0.49.tar.bz2
$ cd dropbear-0.49/

configure make

• dropbear needs access to a good random pool in /dev/random, otherwise it will print this message while running:

Warning: Reading the random source seems to have blocked.
If you experience problems, you probably need to find a better entropy source. 

• i edited options.h and changed the random device to be urandom for this error.

#define DROPBEAR_RANDOM_DEV "/dev/urandom"

• the shell script i used to automate the build process

$ cat run.sh

export CFLAGS="-Os -static -Wall"
export LDFLAGS="-static"
./configure --host=arm-unknown-linux-gnu --build=arm --disable-zlib  --disable-syslog
make clean
make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" MULTI=1 STATIC=1

move to usr/sbin

• dropbearmulti is primary binary, the rest are symbolic links to it

arm@crow:~/dropbear-0.49$ mv dropbearmulti ../tslinux/usr/sbin
arm@crow:~/tslinux/usr/sbin$ ln -s dropbearmulti scp
arm@crow:~/tslinux/usr/sbin$ ln -s dropbearmulti dropbearconvert
arm@crow:~/tslinux/usr/sbin$ ln -s dropbearmulti dropbearkey
arm@crow:~/tslinux/usr/sbin$ ln -s dropbearmulti dbclient
arm@crow:~/tslinux/usr/sbin$ ln -s dropbearmulti dropbear

arm@crow:~/tslinux/usr/sbin$ ls -l | grep drop
lrwxrwxrwx 1 arm arm     13 2007-05-23 11:29 dbclient -> dropbearmulti
lrwxrwxrwx 1 arm arm     13 2007-05-23 11:30 dropbear -> dropbearmulti
lrwxrwxrwx 1 arm arm     13 2007-05-23 11:28 dropbearconvert -> dropbearmulti
lrwxrwxrwx 1 arm arm     13 2007-05-23 11:28 dropbearkey -> dropbearmulti
-rwxr-xr-x 1 arm arm 821396 2007-05-23 11:24 dropbearmulti
lrwxrwxrwx 1 arm arm     13 2007-05-23 11:27 scp -> dropbearmulti

links

• DMP1 SSHD
• Compile Programs