12-11-2008
'X11 forwarding' SSHD assigns already used port
Hi,
We've been facing a strange issue. Clients use X11 forwarding via SSH on HP server and sometimes the same DISPLAY is assigned to two (maybe more) sessions. As a result, some users can't open their applications, and some have their windows redirected to somebody else.
It looks as if sshd was not aware of the ports already assigned to other sessions.
# netstat -an | egrep -e "LISTEN|TIME_WAIT" | awk '{ if($4 ~ /\*\.60[0-9]{2}/) print }' | sort
tcp 0 0 *.6010 *.* LISTEN
tcp 0 0 *.6010 *.* LISTEN
tcp 0 0 *.6011 *.* LISTEN
tcp 0 0 *.6011 *.* LISTEN
tcp 0 0 *.6012 *.* LISTEN
tcp 0 0 *.6012 *.* LISTEN
tcp 0 0 *.6013 *.* LISTEN
tcp 0 0 *.6013 *.* LISTEN
tcp 0 0 *.6014 *.* LISTEN
tcp 0 0 *.6014 *.* LISTEN
tcp 0 0 *.6015 *.* LISTEN
Did anybody experience a similar problem?
Software versions are as follows:
- OpenSSH_4.3p2-hpn, OpenSSL 0.9.7i 14 Oct 2005
- HP-UX Secure Shell-A.04.30.007, HP-UX Secure Shell version
- HP-UX B.11.23 U ia64 0920657533 unlimited-user license
Kind Regards,
Pit
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xfstt(1x) Xfstt User's Manual xfstt(1x)
NAME
xfstt - X11 Font Server for TrueType fonts
SYNOPSIS
xfstt [options]
DESCRIPTION
Xfstt serves TrueType fonts to X11 servers. Start xfstt then tell X11 about the font server with xset fp+ unix/:7101 or (assuming the X11
server runs on host 127.0.0.1) xset fp+ inet/127.0.0.1:7101
OPTIONS
--sync Synchronize the font database with installed fonts and exit when done. Don't do this while xfstt is running.
--gslist
Print font list in a format usable for ghostscript during --sync.
--user username
This is a security feature which is designed to lessen the impact of any future security holes which are found in xfstt. This will
cause xfstt to set its UID and GID to that of the specified user (if that user doesn't exist then it will use your current UID and
GID)
--encoding item[,...]
Remap to different encodings, listed each separated by a comma. Default is iso8859-1. Usage example:
xfstt --encoding iso8859-2,koi8-r,windows-1251
--port number
Change the port number for xfstt's font services. This version of Xfstt defaults to port 7101.
--notcp
Don't open TCP socket, use unix domain only.
--dir name
Change xfstt's font directory. The default directory is /usr/share/fonts/truetype.
--cache name
Change xfstt's font cache directory. The default directory is /var/cache/xfstt.
--pidfile name
Change xfstt's pidfile location. The default file name is /var/run/xfstt.pid.
--res value
Force the resolution for underspecified fonts to value (typically 96 or 120). Default is the value the X11 server suggests which
can be adjusted by the -dpi option of the X11 server. Standard X11 servers have defaults of 72 dpi.
--unstrap
Allow some more unicode characters. This is dangerous for many X11 servers. Start the X server with the "-deferglyphs 16" option to
give the X server a better chance of surviving. For very carefully implemented X servers you may recompile with UNSTRAPLIMIT set to
65535 in order to get the complete unicode range.
--once Exit after the font client disconnects.
--inetd
Tell xfstt to be used as inetd service.
--daemon
Behave like a daemon.
--help Print brief usage information on standard output and exit.
--version
Show the program version.
SEE ALSO
xfs(1), xset(1), X(1), inetd(8).
AUTHORS
Originally written by Herbert Duerr <duerr@de.ibm.com>.
Has been maintained by Steven Carpenter <sjc@debian.org>.
Current maintainer is Guillem Jover <guillem@hadrons.org>.
1.9 2010-01-29 xfstt(1x)