03-14-2002
I checked docs.hp.com and found:
Hosts entered by xhost have access only until the server recycles. A server recycles when the last client attached to a server goes away. For systems running many clients, this is usually at the end of a session. For systems running a server but no clients, hosts entered by xhost may be removed before you have a chance to use the remote host.
To add hosts permanently, make an entry in the X0.hosts file.
--------------------------------------------------------------------------------
The xhost command is in the form:
xhost [+-] [name]
where: +name Add the remote host named name to the list of computers allowed to connect to the X server.
-name Remove name from the list of computers allowed to connect to to the X server.
+ Allow access to everyone (access control disabled).
- Allow access only to computers in the list (access control enabled).
blank Display current status and list of computers allowed to access the X server.
For example, the following command allows the remote computer hpggggg to access your local display.
xhost +hpggggg
For more information, refer to the xhost man page.
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XHOST(1) General Commands Manual XHOST(1)
NAME
xhost - server access control program for X
SYNOPSIS
xhost [[+-]name ...]
DESCRIPTION
The xhost program is used to add and delete host names or user names to the list allowed to make connections to the X server. In the case
of hosts, this provides a rudimentary form of privacy control and security. It is only sufficient for a workstation (single user) environ-
ment, although it does limit the worst abuses. Environments which require more sophisticated measures should implement the user-based
mechanism or use the hooks in the protocol for passing other authentication data to the server.
OPTIONS
Xhost accepts the following command line options described below. For security, the options that effect access control may only be run
from the "controlling host". For workstations, this is the same machine as the server. For X terminals, it is the login host.
-help Prints a usage message.
[+]name The given name (the plus sign is optional) is added to the list allowed to connect to the X server. The name can be a host name or
a user name.
-name The given name is removed from the list of allowed to connect to the server. The name can be a host name or a user name. Existing
connections are not broken, but new connection attempts will be denied. Note that the current machine is allowed to be removed;
however, further connections (including attempts to add it back) will not be permitted. Resetting the server (thereby breaking all
connections) is the only way to allow local connections again.
+ Access is granted to everyone, even if they aren't on the list (i.e., access control is turned off).
- Access is restricted to only those on the list (i.e., access control is turned on).
nothing If no command line arguments are given, a message indicating whether or not access control is currently enabled is printed, fol-
lowed by the list of those allowed to connect. This is the only option that may be used from machines other than the controlling
host.
NAMES
A complete name has the syntax ``family:name'' where the families are as follows:
inet Internet host (IPv4)
inetv6 Internet host (IPv6)
dnet DECnet host
nis Secure RPC network name
krb Kerberos V5 principal
local contains only one name, the empty string
The family is case insensitive. The format of the name varies with the family.
When Secure RPC is being used, the network independent netname (e.g., "nis:unix.uid@domainname") can be specified, or a local user can be
specified with just the username and a trailing at-sign (e.g., "nis:pat@").
For backward compatibility with pre-R6 xhost, names that contain an at-sign (@) are assumed to be in the nis family. Otherwise they are
assumed to be Internet addresses. If compiled to support IPv6, then all IPv4 and IPv6 addresses returned by getaddrinfo(3) are added to the
access list in the appropriate inet or inetv6 family.
DIAGNOSTICS
For each name added to the access control list, a line of the form "name being added to access control list" is printed. For each name
removed from the access control list, a line of the form "name being removed from access control list" is printed.
FILES
/etc/X*.hosts
SEE ALSO
X(1), Xsecurity(1), Xserver(1), xdm(1), getaddrinfo(3)
ENVIRONMENT
DISPLAY to get the default host and display to use.
BUGS
You can't specify a display on the command line because -display is a valid command line argument (indicating that you want to remove the
machine named ``display'' from the access list).
The X server stores network addresses, not host names. This is not really a bug. If somehow you change a host's network address while the
server is still running, xhost must be used to add the new address and/or remove the old address.
AUTHORS
Bob Scheifler, MIT Laboratory for Computer Science,
Jim Gettys, MIT Project Athena (DEC).
X Version 11 Release 6.1 XHOST(1)