SNMP Plugin making wrong interpretation data type

[ghost]

Hello, i am using collectd (4.8.2-1ubuntu0.1) to graph informations from my HP Procurve switches using collectd snmp plugin. One of the data i am collecting is the uptime.

<Plugin snmp>
        <Data "procurve_uptime">
                Type "uptime"
                Table false
                Values ".1.3.6.1.2.1.1.3.0"
                Scale 0.01
        </Data>
        <Host "HP5406zl-2">
                Address "xxx.xxx.xxx.xxx"
                Version 2
                Community "public"
                Collect "procurve_uptime" 
        </Host>
</Plugin>

SysUpTime (.1.3.6.1.2.1.1.3.0) is a 32 bit value and snmp plugin should be able to get value from 0 to 4294967295 (uptime data type is defined like this).

I can get the correct values from most of Procurve Switches (using csv plugini can see positive values) but on somes switches with highest uptime (using snmpwalk i get 2367115384 which is far less than 4294967295) collectd snmp plugin is making a wrong interpretation of the data type and csv plugin shows negatives values.

may this be a bug?.........

thanks

[octo]

The problem is that we do not keep track of the signedness of the original ASN/SNMP value and then need to cast to a double. The code unconditionally uses the signed interpretation, which breaks for numbers larger than 2^31-1. I'll prepare a patch for this.