[Nagiosplug-devel] Patch for check_tcp

[Howard Wilkinson]

This patch alters check_tcp to enable it to handle general conversations 
with the server. It is now table driven and the syntax of the command 
line has changed slightly (should be compatible with previous uses).

Usage: check_tcp -H host -p port [-w <warning time>] [-c <critical 
time>] [[-s <send string>]* [-e <expect string>]*]* [-q <quit string>] 
[-m <maximum bytes>] [-d <delay>] [-t <timeout seconds>] [-r <refuse 
state>] [-v] [-4|-6] [-P <protocol>] [-X <service>]

So send and expect strings can be specified any number of times. Each 
send string item separates an expect string stanza. An empty send string 
is a NULL operation (possibly should be a separate flag). The expect 
items are alternatives in each separate occurence.

Thus:

check_tcp -H mailserver -p smtp -s "USER: fred" -e "OK" -e "FAILED"

means send "USER: fred" and expect either OK or FAILED in response.

While check_tcp -H mailserver -p smtp -s "USER: fred" -e "OK" -s "" -e 
"LOGIN ACCEPTED"

means send "USER: fred and expect OK followed by LOGIN ACCEPTED in 
separate records.

Further advantage of this approach is that additional protocols can be 
built in as necessary with simple table entries.

I considered but have yet to implement a general scheme using the 
services file to look up the protocol and port to use from any program 
name. Uses -p servicename lookup already.

Regards, Howard.



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