XRX(1)XRX(1)NAMExrx - RX helper program
SYNOPSISxrx [-toolkitoption ...] filename
DESCRIPTION
The helper program may be used with any Web browser to interpret docu‐
ments in the RX MIME type format and start remote applications.
xrx reads in the RX document specified by its filename, from which it
gets the list of services the application wants to use. Based on this
information, xrx sets the various requested services, including creat‐
ing authorization keys if your X server supports the SECURITY exten‐
sion. It then passes the relevant data, such as the X display name, to
the application through an HTTP GET request of the associated CGI
script. The Web server then executes the CGI script to start the appli‐
cation. The client runs on the web server host connected to your X
server.
INSTALLATION
You need to configure your web browser to use xrx for RX documents.
Generally the following line in your $HOME/.mailcap is enough:
application/x-rx; xrx %s
However, you may need to refer to your web browser's documentation for
exact instructions on configuring helper applications.
Once correctly configured, your browser will activate the helper pro‐
gram whenever you retrieve any document of the MIME type application/x-
rx.
OPTIONS
The xrx helper program accepts all of the standard X Toolkit command
line options such as:
-xrm resourcestring
This option specifies a resource string to be used. There may
be several instances of this option on the command line.
RESOURCES
The application class name of the xrx program is Xrx and it understands
the following application resource names and classes:
xrxHasFirewallProxy (class XrxHasFirewallProxy)
Specifies whether an X server firewall proxy (see xfwp) is run‐
ning and should be used. Default is ``False.''
xrxInternalWebServers (class XrxInternalWebServers)
The web servers for which the X server firewall proxy should
not be used (only relevant when xrxHasFirewallProxy is
``True''). Its value is a comma separated list of mask/value
pairs to be used to filter internal web servers, based on their
address. The mask part specifies which segments of the address
are to be considered and the value part specifies what the
result should match. For instance the following list:
255.255.255.0/198.112.45.0, 255.255.255.0/198.112.46.0
matches the address sets: 198.112.45.* and 198.112.46.*. More
precisely, the test is (address & mask) == value.
xrxFastWebServers (class XrxFastWebServers)
The web servers for which LBX should not be used. The resource
value is a list of address mask/value pairs, as previously
described.
xrxTrustedWebServers (class XrxTrustedWebServers)
The web servers from which remote applications should be run as
trusted clients. The default is to run remote applications as
untrusted clients. The resource value is a list of address
mask/value pairs, as previously described.
ENVIRONMENT
The xrx helper program uses the standard X environment variables such
as ``DISPLAY'' to get the default X server host and display number. If
the RX document requests X-UI-LBX service and the default X server does
not advertise the LBX extension, xrx will look for the environment
variable ``XREALDISPLAY'' to get a second address for your X server and
look for the LBX extension there. When running your browser through
lbxproxy you will need to set XREALDISPLAY to the actual address of
your server if you wish remote applications to be able to use LBX
across the Internet.
If the RX document requests XPRINT service, xrx looks for the variable
``XPRINTER'' to get the printer name and X Print server address to use.
If the server address is not specified as part of XPRINTER, xrx uses
the first one specified through the variable ``XPSERVERLIST'' when it
is set. When it is not xrx then tries to use the video server as the
print server. If the printer name is not specified via XPRINTER, xrx
looks for it in the variables ``PDPRINTER'', then ``LPDEST'', and
finally ``PRINTER'',
Finally, if you are using a firewall proxy, xrx will look for
``PROXY_MANAGER'' to get the address of your proxy manager (see proxym‐
ngr). When not specified it will use ":6500" as the default.
KNOWN BUG
When an authorization key is created for a remote application to use
the X Print service, the helper program has to create the key with an
infinite timeout since nobody knows when the application will actually
connect to the X Print server. Therefore, in this case, the helper pro‐
gram stays around to revoke the key when the application goes away
(that is when its video key expires). However, if the helper program
dies unexpectedly the print authorization key will never get revoked.
SEE ALSO
libxrx (1), xfwp (1), lbxproxy (1), proxymngr (1), The RX Document
specification
AUTHOR
Arnaud Le Hors, X Consortium
X Version 11 Release 6.4 XRX(1)
