Cellular Network Infrastructure » cni-legacy » OpenBSC

PageOutline = Information on the WRTU54G UMA TA =

Getting shell / console access

The easiest part is to flash a modified firmware image that removes the root password from the /etc/passwd file in the squashfs.

You can then access the serial console and log in as root without password.

Changing the SEGW / GANC address

On the shell of the device, change to the /nv directory and edit the two lines in rc.conf for UMA_SGW and UMA_UNC to: {{{
UMA_SGW="my.segw.host.name"
UMA_UNC="my.unc.host.name"
}}}

Then, use the {{{raaccess -a rc.conf}}} command to store the changes to flash and reboot the system.

Adding a new CA Certificate

While modifying the firmware, add your new CA root certificate in DER format to /ramdisk_copy/etc/kineto/ and then add the filename
and path into a new line in /ramdisk_copy/etc/kineto/init_ike.cfg, like this: {{{
ike ca /etc/kineto/my_new_ca.der
}}}

Enabling telnet

Using the toolchain included in the Linksys WRTU54G GPL release, you can cross-compile utelnetd for a compatible uclibc: {{{
./utelnetd-0.1.11 $ make CC=mipsel-linux-gcc
mipsel-linux-gcc -I. -pipe -DSHELLPATH=\"/bin/login\" -Wall -fomit-frame-pointer -c -o utelnetd.o utelnetd.c
mipsel-linux-gcc -I. -pipe -DSHELLPATH=\"/bin/login\" -Wall -fomit-frame-pointer utelnetd.o -o utelnetd
strip --remove-section=.comment --remove-section=.note utelnetd
./utelnetd-0.1.11 $
}}}

You can then include this utelnted binary into the squashfs image to /usr/sbin/utelnted.

Furthermore, you have to edit /etc/rc.d/rc.proprietary and change the line {{{
[ "`uname -ar | grep diag`" ] && /usr/sbin/utelnetd&
}}}
into {{{
usr/sbin/utelnetd&
}}}
to unconditionally start the telnet daemon at every boot.