EMBA firmware report

[*] Emulating binary name: telnetd

[*] Emulator used: qemu-mipsel

[*] Using root directory: /logs/s115_usermode_emulator/firmware/unblob_extracted/firmware_extract/DIR-600_fw_revb5_214b01_ALL_de_20130122/dir600b_v2.14_d1mg.bin_extract/1179788-3612812.squashfs_v4_le_extract (1/1)

[*] Using CPU config: NONE

[*] Emulating binary: /usr/sbin/telnetd

[*] Emulating binary ./usr/sbin/telnetd with parameter NONE

[*] Emulating binary ./usr/sbin/telnetd with parameter -v

[*] Emulating binary ./usr/sbin/telnetd with parameter -V

./usr/sbin/telnetd: invalid option -- v

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

[*] Emulating binary ./usr/sbin/telnetd with parameter -h

./usr/sbin/telnetd: invalid option -- V

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

[*] Emulating binary ./usr/sbin/telnetd with parameter -help

./usr/sbin/telnetd: option requires an argument -- h

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

[*] Emulating binary ./usr/sbin/telnetd with parameter --help

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

[*] Emulating binary ./usr/sbin/telnetd with parameter --version

./usr/sbin/telnetd: invalid option -- -

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

[*] Emulating binary ./usr/sbin/telnetd with parameter version

./usr/sbin/telnetd: invalid option -- -

Usage: ./usr/sbin/telnetd [-p port] [-i ifname] [-u user:password] [-t timeout] [-l loginpath]

bind: Address already in use

For reproducing the EMBA user-mode emulation mechanism, the following commands could be used as starting point:

 - Start EMBA docker container with the firmware directory as log directory:

      # EMBA="." FIRMWARE="/home/runner/work/emba/emba/DIR-600_fw_revb5_214b01_ALL_de_20130122.zip" LOG="/absolute/path/to/EMBA/log/directory" docker-compose run emba

 - Change your working directory to the root directory of your firmware:

      # cd /logs/s115_usermode_emulator/firmware/unblob_extracted/firmware_extract/DIR-600_fw_revb5_214b01_ALL_de_20130122/dir600b_v2.14_d1mg.bin_extract/1179788-3612812.squashfs_v4_le_extract

 - Copy the static compiled user-mode emulator to your current working directory

      # cp $(which qemu-mipsel) .

 - Start the emulation with the following command:

      # jchroot  . -- ./qemu-mipsel ./usr/sbin/telnetd <parameters like -v or --help>

WARNING: EMBA is doing some more magic in the background. Probably it is not that easy, but give it a try.