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CHAPTER 21 A BRIEF TOUR OF THE X DISPLAY ENVIRONMENT
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If the three conditions of the if statement are not satisfied, you are on a machine other than the one where the X tunneling takes place, and you need to determine whether .xauth.$LOGNAME exists.
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else if [ -f $HOME/.xauth.$LOGNAME ] then cat $HOME/.xauth.$LOGNAME | xauth nmerge DISPLAY=`cat $HOME/.xdisp.$LOGNAME` export DISPLAY fi fi
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The hope is that it does, but you shouldn t count on this. If the file does exist, you have to import the authority information into the local .Xauthority file and set the DISPLAY variable appropriately. The assumption here is that if one of the files exists, they both do. To be prudent, you would want to implement another check for the existence of the display file. Once you ve done that, all X clients you run from this remote node will be able to access the ssh session where X is being tunneled. Similar code could be added to the system /etc/profile on each of the nodes in your environment so that it will be effective for all users instead of just one. This may be a tedious task if you have many systems and operating-system types, each with its own configuration details; you will have to address these issues if you pursue this option.
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Root-Profile Entry
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If you intend to add similar code to the system /etc/profile, you may be interested in also entering the following code to the root user s personal profile to handle the scenario in which an administrator logged into a system as himself and became the root user via the su - command. The code determines which user became root. Then it imports the original user s X-environment settings. Thus, the administrator can run X client applications and have them display with his personal settings. First the code determines which xauth utility to use; it also needs the parent and grandparent process IDs of the running shell (MYPPID and MYPPPID).
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XAUTH=`which xauth` MYPPID=`ps -fp $$ | tail -n 1 | awk '{print $3}'` MYPPPID=`ps -fp $MYPPID | tail -n 1 | awk '{print $3}'` MYID=`ps -fp $MYPPID | tail -n 1 | awk '{print $1}'` MYOID=`ps -fp $MYPPPID | tail -n 1 | awk '{print $1}'`
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Once the code has found the values, the script determines the owners of those processes (MYID and MYOID). The reason for determining the owner of both the parent and grandparent process IDs is that the parent ID (which represents the su command) is
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CHAPTER 21 A BRIEF TOUR OF THE X DISPLAY ENVIRONMENT
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sometimes owned by root, and sometimes owned by the user that is becoming root depending on the system you re on. We have to check for both.
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if [ "$MYID" != "root" ] || [ "$MYOID" != "root" ] then for user in $MYID $MYOID do if [ "$user" != "root" ] then MYID=$user fi done
If either of those two variables (MYID and MYOID) is not root, you have to assume that someone has become root using su -. The for loop then determines which variable is not root and sets MYID to that user. Now that MYID is set to the appropriate user, the script needs to find that user s home directory.
MYHOME=`grep "^$MYID:" /etc/passwd | cut -d: -f6` if [ -f $MYHOME/.xauth.$MYID ] then cat $MYHOME/.xauth.$MYID | $XAUTH nmerge DISPLAY=`cat $MYHOME/.xdisp.$MYID` export DISPLAY fi fi
In a Network Information Service (NIS) environment, you ll want to change the MYHOME command to get the value from the appropriate NIS map. Once the home directory is known, we can determine whether the .xauth.$MYID file exists. If it exists, we import .Xauthority and DISPLAY information into the current shell environment. Once again, you may want to check for the existence of the display file instead of assuming it exists. The root user should now be able to start X client applications and have them display on the user s X server.
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