nagios nrpe connection

[Andreas Ericsson]

Marcos & Marcelo wrote:
> Hi Folks,
>  
>  I would like to know which protocol Nagios uses in order to connect with NRPE in the client machine.
>  
Nagios executes a plugin called check_nrpe, which communicates via 
standard tcp sockets.
The data exchange goes a little something like this (for nrpe v2, 
possible ssl handshake excluded);

struct packet_struct {
	int16_t		packet_version;
	int16_t		packet_type;
	u_int32_t	crc32_value;
	int16_t		result_code;
	char		buffer[1024];
};

check_nrpe (the plugin) sends {0x0002, 0x0001, (generated), 0, 
"command_to_check"}

which means "NRPE Protocol version 2, Querypacket, crc32value, 0, run 
command with command_name 'command_to_check'"


nrpe (the daemon) responds {0x0002, 0x0002, (generated), (return code),
"plugin output"}

which means "NRPE Protocol version 2, Responsepacket, crc32value, 
(plugin exit status), "plugin output").


> Thanks
> Marcelo

-- 
Mvh / Best Regards
Sourcerer / Andreas Ericsson
OP5 AB
+46 (0)733 709032
andreas.ericsson at op5.se


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