Mail Archives: cygwin/2005/12/01/12:46:03
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Hi...
It is just a little program I wrote to send the message. It is attached.
The method I used works on XP and 2000. I have not tested on any other
platforms.
HTH,
...Karl
>From: CyberZombie Subject: Re: how to make ssh-agent automatically
>Date: Thu, 01 Dec 2005 11:03:20 -0600
>
>I am unable to locate "sendchenv". This tool looks like it solves a
>frustrating problem I have been having (getting regtool changes to register
>in any new Cygwin/Windows program). Can you point out where to find it?
>
>Karl M wrote:
>>Hi H.S....
>>
>>Using keychain is only one way, it is not the only way. I no longer use
>>keychain.
>>
>>I launch ssh-agent from a bash script that is run as a service from
>>cygrunsrv; it is run as the user, not as SYSTEM. This makes the ssh-agent
>>process survive Windows logout; I only have to enter a passphrase after
>>reboot. The bash script edits the user registry to define the environment
>>variable for the ssh-agent socket. It sends a message that the environment
>>has been updated and then waits on a sleeping child to keep the service
>>control manager happy.
>>
>>The script looks like
>>
>>$ cat /bin/secret-agent-service
>>#!/bin/bash
>># Launch the ssh-agent from a service so it survives logoff.
>>
>># When the service stops, kill the ssh-agent.
>>trap "ssh-agent -k;
>> exit 0" TERM
>>
>># Clean up old files that may be left behind after a crash.
>># The file permissions make this safe to do in a multi-user
>># environment, but "/tmp" must be local to this host.
>>rm -rf /tmp/ssh-*
>>
>># Launch the ssh-agent.
>>eval $(ssh-agent)
>>
>># Provide the ssh-agent socket ID via the registry and broadcast
>># the change in case the user is logged before we finish.
>># Do not provide the ssh-agent PID to minimize the risk of
>># killing the ssh-agent.
>>regtool -s set /HKEY_CURRENT_USER/Environment/SSH_AUTH_SOCK $SSH_AUTH_SOCK
>>sendchenv
>>
>># Wait quietly until the service is stopped.
>>while true; do
>> sleep 24h &
>> wait
>>done
>>
>>In my .bash_profile I have
>>
>>ssh-add -l >/dev/null 2>&1
>>if [ $? -eq 1 ]; then
>> ssh-add
>>fi
>>
>>which checks if the agent is there and needs a passphrase, and if so,
>>invokes ssh-add and I enter my passphrase.
>>
>>I will look at the new cygrunsrv changes and see if I can simplify things
>>and then propose a package.
>>
>>This saves almost one second of CPU time when I start a bash window,
>>compared to using keychain (also launched as a service).
>>
>>HTH,
>>
>>...Karl
>>
>>>From: "H.S." Subject: Re: how to make ssh-agent automatically
>>>Date: Wed, 30 Nov 2005 21:24:20 -0500
>>>
>>>Hi Karl,
>>>
>>>Karl M wrote:
>>> > Hi HS...
>>> >
>>> > You can use keychain (a package available from setup.exe).
>>> >
>>> > I do something like
>>> >
>>> > ssh-add -l >/dev/null 2>&1
>>> > if [ $? -eq 1 ]; then
>>> > ssh-add
>>> > fi
>>> >
>>> > in my .bash_profile, because keychain is slow when I launch several
>>> > windows.
>>>
>>>Okay, I will try that. BTW, just out of curosity, is using keychain only
>>>one of the methods to achieve this or is it the only method? I mean, is
>>>it possible to do this without keychain or any other packages and just
>>>with ssh and rsync and login/logout files and environment variables?
>>>
>>>
>>> >
>>> > Why do you kill the agent when you log out? (Windows will kill it when
>>> > you log off from windows.)
>>>
>>>Currently I was starting ssh-agent in cygwin command prompt window. And
>>>if I did not kill ssh-agent the window would not close upon exit. By
>>>killing if from .bash_logout solved that problem.
>>>
>>>thanks,
>>>->HS
>>>
>>> > If you want to keep the agent around from one login to the next, you
>>>can
>>> > launch the agent as a service. I used to do that with keychain, but
>>>for
>>> > performance reasons, I use ssh-agent and ssh-add directly. I plan on
>>> > proposing a package for doing this.
>>> >
>>> > HTH,
>>> >
>>> > ...Karl
>>> >
>>> >
>>>
>>>
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>>
>>
>>
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>>
>
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Content-Type: text/plain; name="sendchenv.c"; format=flowed
Content-Transfer-Encoding: 8bit
Content-Disposition: attachment; filename="sendchenv.c"
#include <windows.h>
int main()
{
DWORD dwReturnValue;
LRESULT lrStatus = SendMessageTimeout(
HWND_BROADCAST,
WM_SETTINGCHANGE,
0,
(LPARAM) "Environment",
SMTO_ABORTIFHUNG,
5000,
&dwReturnValue
);
return (lrStatus) ? 0 : 1;
}
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