OS4X Core configuration

Accessing configuration

OS4X stores its core configuration in one simple database table. The configuration can therefor be changed in two ways:

• using the comfortable web interface
• using a database client program to change the values manually.

Because of the quite non-understandable names of the configuration values, all configuration value names are listed in each block of configuration for manual editing.

web interface method

The OS4X web interface includes an entry in the left menu for the core configuration. Its name is "Configuration". The configuration web interface is segmentated into the following blocks:

• TCP/IP
• SSL/TLS
• ISDN
• Odette
• Directories
• Event scripts
• Daemon
• Partner table
• GUI niceup

Each block is accessible with a link in the head of the configuration panel. Also, each block is entitled with its name and a link to access the top of the form.

database method

The table "[tableprefix]configuration" (default: "os4x_configuration") contains two columns:

• name
• value

The column "name" is the name of the configuration which is affected.

The column "value" reflects the configuration value, limited to 255 characters.

All boolean values react that the a value of zero ("0") if false and all other values are true.

Configurable values

The following configuration parameters show the position in the web GUI, beginning in the top. Each configuration name as used in all binaries, web interface, scripts etc. are listed in each block and explained as needed.

TCP/IP

This block contains all basic TCP/IP parameters, such as port numbers, timeout values etc.

TCP/IP port of OFTP server

DB configuration name: tcp_port

This numeric value between 1 and 65535 describes the TCP/IP port the OFTP server is watching for incoming connections. The maximum of parallel incoming connections is limited by the operating system kernel and can be influenced by the kernel parameter "SOMAXCONN".

TCP/IP port of OFTP server (TLS)

DB configuration name: tcp_port_tls

This numeric value between 1 and 65535 describes the TCP/IP port the OFTP server is watching for incoming OFTP2 connections which are secured by TLS. The maximum of parallel incoming connections is limited by the operating system kernel and can be influenced by the kernel parameter "SOMAXCONN". This port must not be the same as the OFTP server port from above.

TCP/IP port of OS4X debug daemon

DB configuration name: debugd_port

This numeric value between 1 and 65535 describes the TCP/IP port the OFTP server is watching for debug output. Every OS4X program generates this output. The daemon collects this data and is able to dump this data in an encrypted file. This must not be the same as OFTP or OFTP 2 server ports.

TCP/IP timeout

DB configuration name: tcp_timeout

This numeric value defines the maxmimum number of seconds between two TCP/IP packages to arrive. If this value is too low you might get network disconnects, setting this value very high means that a network disconnect will be discovered very late.

TCP/IP OFTP maximum buffersize

DB configuration name: oftp_default_buffersize_tcpip

During the OFTP handshake, the maximum size of a data buffer will be commited. This value reflects the maximum size of such data buffers. The minimum value is 128, the maximum can be should not be over 65535 (because of TCP/IP packaging). The higher the value, the faster the data transfer rate will be (but it depends on the partner side). On unreliable connections, use the default value of 2048 bytes.

TCP/IP OFTP maximum credit count

DB configuration name: oftp_default_creditcount_tcpip

As the OFTP maximum buffersize, this value will be commited with the partner during a OFTP handshake. The number defines the amount of uncommited data buffers send to the receiver during file transfers. Increasing this value also increases the throughput. On unreliable connections you should use the default of 20. This is a different value than used for ISDN connections.

use receiving acceleration?

DB configuration name: oftp_tcpip_rec_acceleration

This technique is used to accelerate incoming TCP/IP connection by pre-sending the so-called "OFTP credits" (which are used for handshaking OFTP data buffers) during file transfers. If your partner doesn't like this type of acceleration (i.e. partners who use Seeburger products), you have to disable it. You also have the chance to define a row in the partner table to define partner based acceleration.

use send acceleration?

DB configuration name: oftp_tcpip_send_acceleration

Enabling this feature turns on code to ignore the first OFTP credit messages during file transfer. This tunes up transfer speed up to factor 100. The number of "ignored" OFTP credits is calculated dynamically via the agreed value of the buffersize during protocol handshake, based on a maximum TCP/IP package size of 60000 bytes (where 65536 bytes are possible). If you experience transfer aborts, disable this feature.

SSL/TLS parameters

For securing TLS sessions over TCP/IP networks (such as internet), you need to give some information about your local certificates. These information don't have to be the same as for file based security.

local certificate file & local certificate password

DB configuration name: tls_local_certificate & tls_server_cert_password

Absolute path to the OFTP server certificate (in PEM format) for OFTP over TCP/IP (TLS secured). If the certificate is password-protected, you may enter it in the password field.

local client certificate file & client certificate password

DB configuration name: tls_default_client_certificate & tls_client_cert_password

Absolute path to the OFTP server certificate (in PEM format) for OFTP over TCP/IP (TLS secured). If the certificate is password-protected, you may enter it in the password field.

root certificate file & root certificate path

DB configuration name: tls_root_certificate & tls_root_certpath

The root certificates are used to authentificate partners which have certificates of unknown signers. At least one of these fields must be filled (even if the root certificate path doesn't contain any root certificates). The certificates must be in PEM format.

Diffie-Hellman parameter files

DB configuration name: dh128_file, dh256_file, dh512_file & dh1024_file

These files (128bit, 256bit, 512bit and 1024bit) contain prime numbers, which are the basis for TLS encrypted connections. If the file is writable, or the file doesn't exist and the directory is writable, you can generate a new file from the web interface by using the link "Recalculate" or "Generate" in the web interface, which opens a new window which executes the command. Don't close this window until you can read the message "You can close this window now"!

Allow self-signed certificates

DB configuration name: oftpv2_allow_selfsigned_cert

Enabling this checkbox disables the rejection of incoming TLS connections which are secured via a self signed certificate. The default should be on.

Entropy file for random data

DB configuration name: tls_entropy_file

In order to use TLS, you have to specify a random data source. This is a kernel based character file (like "/dev/urandom" or "/dev/random"). If your operating system doesn't support such a random file (like AIX 5.1), you can generate such a file on your own (i.e. with the tool "ssh-rand-helper" from any openSSL installation). At least 256 bytes of random data must exist in this file.

ISDN parameters

Basic ISDN parameters for OFTP connections have to be defined here.

ISDN OFTP maximum buffersize

DB configuration name: oftp_default_buffersize_isdn

As the TCP/IP maximum buffersize (as mentioned above), this numeric value reflects the maximum size of a OFTP data buffer. It may result to problems if this is set to values higher than your ISDN controllers can use for maximum transfer size, which is limited by CAPI2.0 to 4096 bytes. The minimum is 128 bytes.

ISDN OFTP maximum credit count

DB configuration name: oftp_default_creditcount_isdn

Same as the TCP/IP maximum credit count, this numeric value reflects the number of OFTP data exchange buffers before a little handshake will be done by the OFTP protocol.

Odette parameters

Default OFTP parameters for authentifications are configurable here. If no special columns are defined in the partner table below, these values will be used.

my default SSID, my default SFID, my default OFTP password, change every partner entry

DB configuration name: default_ssid, default_sfid & default_password

These elements are only used for the web interface for creating new partners or for changing all partner values. If the checkbox is enabled, all partners in the partner table will get the new values for SSID, SFID and password on your side. If you don't configure columns in the partner table configuration below, these values are used for OFTP authentification.

Directories

In order to let OS4X know where to find directories and files, these values have to be defined.

data incoming directory

DB configuration name: incoming_directory

After successful file transfers (receiving), this directory defines where the incoming files will be stored. This directory must be on the same filesystem as the temporary directory (see below), otherwise you will get an error message in syslog (if enabled) that moving incoming files cannot be done. The filesystem must be dimensioned big enough to store a file with at most the maximum transfer size. I.e., if you receive a file of 200MB, you will need to have 200MB free on this filesystem, otherwise an error message will be sent to the partner (that the local filesystem is not big enough) and an entry to the receive log will be added.

data outgoing directory

DB configuration name: outgoing_directory

In order to enqueue a new file, the file selector of the web interface (in the send queue) will point to this directory first. Also, OS4X Enterprise uses this directory for outgoing files selected by a client.