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Top Forums Shell Programming and Scripting check ssh connection to remote host Post 302197086 by praveenbvarrier on Tuesday 20th of May 2008 07:22:38 AM
Old 05-20-2008
I got a problem here

I removed the public key config on the ssh server and then tried

ssh root@$host "echo 2>&1" && echo "OK" || echo "NOK"

But it came out asking password . which I dont want , what I wanted is even if its asked passwd its should come out with a non-zero exit satus.

--------------------------------------------------------------------
Now let say how I got it implemented , even though a twisted way

if [ -f $HOME/.ssh2/ssh2_config ]
then
mv $HOME/.ssh2/ssh2_config $HOME/.ssh2/ssh2_config.bkp
echo "QuietMode yes\nBatchMode yes\nConnectTimeout 4" > $HOME/.ssh2/ssh2_config
else
echo "QuietMode yes\nBatchMode yes\nConnectTimeout 4" > $HOME/.ssh2/ssh2_config
fi

ssh -l root $R_HOSTNAME "date" > /dev/null
CONN_STATUS=$?

And if the RC is 66 , then it mean it had asked passwd and not got passwd within in the timeout period. Andas usual 0 as success.
 

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SSH2_PUBLICKEY_LIST(3)							 1						    SSH2_PUBLICKEY_LIST(3)

ssh2_publickey_list - List currently authorized publickeys

SYNOPSIS
array ssh2_publickey_list (resource $pkey) DESCRIPTION
List currently authorized publickeys. PARAMETERS
o $pkey - Publickey Subsystem resource RETURN VALUES
Returns a numerically indexed array of keys, each of which is an associative array containing: name, blob, and attrs elements. Publickey elements +----------+---------------------------------------------------+ |Array Key | | | | | | | Meaning | | | | +----------+---------------------------------------------------+ | name | | | | | | | Name of algorithm used by this publickey, for | | | example: ssh-dss or ssh-rsa. | | | | | blob | | | | | | | Publickey blob as raw binary data. | | | | | attrs | | | | | | | Attributes assigned to this publickey. The most | | | common attribute, and the only one supported by | | | publickey version 1 servers, is comment, which | | | may be any freeform string. | | | | +----------+---------------------------------------------------+ EXAMPLES
Example #1 Listing authorized keys with ssh2_publickey_list(3) <?php $ssh2 = ssh2_connect('shell.example.com', 22); ssh2_auth_password($ssh2, 'jdoe', 'secret'); $pkey = ssh2_publickey_init($ssh2); $list = ssh2_publickey_list($pkey); foreach($list as $key) { echo "Key: {$key['name']} "; echo "Blob: " . chunk_split(base64_encode($key['blob']), 40, " ") . " "; echo "Comment: {$key['attrs']['comment']} "; } ?> The above example will output: Key: ssh-rsa Blob: AAAAB3NzaC1yc2EAAAABIwAAAIEA5HVt6VqSGd5P TrLRdjNONxXH1tVFGn0Bd26BF0aCP9qyJRlvdJ3j 4WBeX4ZmrveGrjMgkseSYc4xZ26sDHwfL351xjza LpipuBGRrw17mWVBhuCExo476ri5tQFzbTc54VE HYckxQ16CjSTibI5X69GmnYC9PNqEYq/1TP+HF10 Comment: John's Key Key: ssh-rsa Blob: AAAAB3NzaHVt6VqSGd5C1yc2EAAAABIwA232dnJA AIEA5HVt6VqSGd5PTrLRdjNONxX/1TP+HF1HVt6V qSGd50H1tVFGn0BB3NzaC1yc2EAd26BF0aCP9qyJ RlvdJ3j4WBeX4ZmrveGrjMgkseSYc4xZ26HVt6Vq SGd5sDHwfL351xjzaLpipuBGB3NzaC1yc2EA/1T Comment: Alice's Key NOTES
Note The public key subsystem is used for managing public keys on a server to which the client is already authenticated. To authenticate to a remote system using public key authentication, use the ssh2_auth_pubkey_file(3) function instead. SEE ALSO
ssh2_publickey_init(3), ssh2_publickey_add(3), ssh2_publickey_remove(3). PHP Documentation Group SSH2_PUBLICKEY_LIST(3)
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