by hi,
i created a script to transfer 110/pop3 connection which grew to what
you see below. now it includes ftp, news, telnet port tranferrence and
regualr ssh connection.
can anybody comment on the usage function, killing process, and
anything else?
it was written on/for freebsd 4.3, but should be usable elsewhere.
thanks much.
- parv
================= portssh
#!/bin/sh
## use PATH only what's required...
## cat, test, ssh
#
PATH=/bin:/usr/bin
## set server for regual ssh connection & for port transfer
#
REMOTE_ssh_server=
## set for transferring port & used to kill 'transferred' connections
#
REMOTE_xfer_host=
# -- be sure you know what you are doing before editing below ---
# ssh options
# 2: use ssh v2 protocol
# a: disable auhentication agent forwarding
# C: use compression/gzip
# f: go to background after authentication
# L: forward local port
# N: don't execute remote commands (just port forwarding; ssh2 only)
# v: be verbose
# x: disable X11 forwarding
# X: allow X11 forwording
#
OPT_xfer='-2 -a -C -f -N -x'
OPT_ssh='-2 -a -C -x'
usage ()
{
cat <<_USAGE_
# see ssh man page for various options given below.
#
# befor starting, make sure that you have set your own...
# REMOTE_ssh_server -- destination server to connect to
# REMOTE_xfer_host -- reciever of the transferred host
- to transfer local port to remote port, give one of the options...
`basename $0` ([ftp|21] [telnet|23] [pop3|110] [nntp|119])
default options for port transfer: $OPT_xfer
- to start ssh...
`basename $0` [ssh|22]
default options for ssh: $OPT_ssh
- to stop/kill port transfer processes only...
a. kill all of them...
`basename $0` [stop|0]
b. kill cretain ones, specify type...
`basename $0` [stop|0] ([ftp|21] [telnet|23] [pop3|110] [nntp|119])
_USAGE_
# assign service based on script name (in case of sym link), or use $1Quote:}
#
case $1 in
ftp|21)
SERVICE=ftp
LOCAL_xfer_port=410021
REMOTE_xfer_port=21
;;
telnet|23)
SERVICE=telnet
LOCAL_xfer_port=410023
REMOTE_xfer_port=23
;;
pop3|110)
SERVICE=pop3
LOCAL_xfer_port=410110
REMOTE_xfer_port=110
;;
news|nntp|119)
SERVICE=nntp
LOCAL_xfer_port=410119
REMOTE_xfer_port=119
;;
ssh|22)
SERVICE=ssh
shift
;;
stop|0)
SERVICE=stop
shift
;;
*)
usage
exit
;;
esac
#
## stop, kill actually, ssh clients
#
if test "$SERVICE" = 'stop'
then
# get ps output & convert spaces to #'s
#
# line wrapped only for posting
#
PS=$( ps -wax | egrep "ssh.* -L .*:${REMOTE_xfer_host}:.*" | \
sed 's! !#!g' | egrep -v 'ps -wax|grep|sed' )
# no process found, exit then
#
if test -z "$PS"
then
echo ' -' no ssh process found, exiting...
exit 0
fi
# otherwise, kill 'em
#
for current_ps in $PS
do
# restore spaces
current_ps=$(echo $current_ps | sed 's!#! !g')
# lines wrapped for posting
#
case $1 in
ftp)
Pid=$( echo $current_ps | \
awk '/410021:'"$REMOTE_xfer_host"':21/ {print $1}' )
;;
telnet)
Pid=$( echo $current_ps | \
awk '/410023:'"$REMOTE_xfer_host"':23/ {print $1}' )
;;
pop3)
Pid=$( echo $current_ps | \
awk '/410110:'"$REMOTE_xfer_host"':110/ {print $1}' )
;;
nntp)
Pid=$( echo $current_ps | \
awk '/410119:'"$REMOTE_xfer_host"':119/ {print $1}' )
;;
*)
Pid=$(echo $current_ps | awk '{print $1}')
;;
esac
if test -z $Pid
then
echo ' -' no ssh process found ${1}
else
# for debugging only...
#
#echo $current_ps
echo ' -' $1 killing $Pid ...
kill -SIGKILL $Pid
echo ' ... done'
fi
done
exit
#
## transfer local port
#
elif test "$SERVICE" != 'ssh'
then
# create tunnel/forward port only
#
# lines wrapped for posting
#
echo ' -' $SERVICE: localhost $LOCAL_xfer_port '->' $REMOTE_xfer_host \
$REMOTE_xfer_port
echo ' ' via $REMOTE_ssh_server ...
ssh $OPT_xfer \
-L ${LOCAL_xfer_port}:${REMOTE_xfer_host}:${REMOTE_xfer_port} \
$REMOTE_ssh_server "sleep 40"
echo ' ...done w/ return code' $? '(0: success, else failure)'
#
## start ssh
#
else
# by chance, we manage to specify a ssh connection, either start
# ssh or display/exit; i decided to start ssh
#
#echo ' -' ssh: $REMOTE_ssh_server
fi
# end of script
exit
=================
--
so, do you like word games or scrabble?
- parv