FTP

FTP (File Transfer Protocol) can easily be used on APF/OPOS modules, either to transfer some files from/to elsewhere (== as client) or to provide files to others (== as server).

FTP as client

# ftpget
# ftpput

SFTP as client

You will have to install OpenSSH package which provides sftp command:

 $ make menuconfig

Target packages  --->
    ...
    Networking applications  --->
        ...
        [*] openssh

Reflash your rootfs, then:

# sftp -P 666 foo@server         (666 is the SFTP port if not standard one)

• For non interactive mode, use -b option with a batch file (https://linux.die.net/man/1/sftp). For example:

# cat > sftp.batch <<EOF
version
lcd /tmp
progress
get myfile.bin
bye
EOF

• Non interactive mode requires you add a user (here foo) matching the one on your server and generate/install SSH keys following [

http://www.jscape.com/blog/setting-up-sftp-public-key-authentication-command-line this tutorial]

• Then:

# sftp -P 666 -b sftp.batch foo@server

FTP server

Buildroot propose ProFTPD as standard FTP server. You can add it to your rootfs with:

 $ make menuconfig

Target packages  --->
    ...
    Networking applications  --->
        ...
        [*] proftpd

 $ make

• then reflash your rootfs
• ProFTPD will be automatically launched thanks to the /etc/init.d/S50proftpd script
• you can configure the server with: /etc/proftpd.conf

Links

Wikipedia FTP article