Nokia N900 – Maemo
This is a dirty workaround, but no one seems to find a more elegant way.
Put these lines in your /etc/ssh/sshd_config
Compression no #optional UseDNS no #optional ForceCommand /usr/lib/openssh/ssh-session
Create /usr/lib/openssh/ssh-session
#!/bin/sh
if [ $USER = root ]; then
IFCONFIG=ifconfig
MGMT=/usr/lib/openssh/ssh-power-management
else
IFCONFIG="sudo ifconfig"
MGMT="sudo /usr/lib/openssh/ssh-power-management"
fi
WLAN_IP=$($IFCONFIG wlan0 | sed -n 's/.*inet addr:([0-9.]+).*/1/p')
SSH_IP=$(echo $SSH_CONNECTION | cut -d ' ' -f 3)
if [ "$WLAN_IP" = "$SSH_IP" ]; then
ps -f | grep /usr/lib/openssh/ssh-power-management | grep -qv grep
if [ $? -eq 1 ]; then
$MGMT &
fi
fi
if [ -n "$SSH_ORIGINAL_COMMAND" ]; then
eval $SSH_ORIGINAL_COMMAND
else
$SHELL
fi
Create /usr/lib/openssh/ssh-power-management
#!/bin/sh if [ $USER = root ]; then IWCONFIG="iwconfig" else IWCONFIG="sudo iwconfig" fi while [ $(lsof -a -i4 -a -i :ssh | grep ESTABLISHED | wc -l) -gt 0 ]; do $IWCONFIG wlan0 power off $IWCONFIG wlan0 txpower 100mW sleep 20 done $IWCONFIG wlan0 power on $IWCONFIG wlan0 txpower 10mW
You need to have wireless-tools installed (and sudser if you don’t want to add an appropriate entry to /etc/sudoers.d/).
Then run
sudo chmod +x /usr/lib/openssh/ssh-session sudo chmod +x /usr/lib/openssh/ssh-power-management sudo /etc/init.d/ssh restart
Authentication process will remain slow and you’ll notice a small gap after login; then the lags will disappear until you close all active ssh/sftp connections.
The 20 seconds timeout for invoking iwconfig isn’t meant to be precise, test and report your measures.
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If you use ssh server only at home, you may also want to do this:
Create /etc/network/if-up.d/ssh (replace YOUR_AP_ESSID with the name of your access point)
#!/bin/sh
if [ "$ICD_CONNECTION_TYPE" = "WLAN_INFRA" ] ; then
KEY="/system/osso/connectivity/IAP/$ICD_CONNECTION_ID/name"
AP=$(/usr/bin/gconftool -g "$KEY")
if [ "$AP" = "YOUR_AP_ESSID" ] ; then
/etc/init.d/ssh start
fi
fi
exit 0
and /etc/network/if-down.d/ssh
#!/bin/sh /etc/init.d/ssh stop exit 0
Comment out the corresponding lines in /etc/event.d/sshd
#start on stopped rcS
console output
#respawn
pre-start script
if [ ! -d /var/run/sshd ] ; then
mkdir /var/run/sshd
chmod 755 /var/run/sshd
fi
end script
exec /usr/sbin/sshd -D
Then run
sudo chmod +x /etc/network/if-*.d/ssh sudo update-rc.d -f ssh remove
Source Maemo.Org
