Configuration file query

I have a configuration file (listen.conf) with the following format:
[jupiter]
event_class="jupiter_bypass"
event_state="active"

[hammer]
event_class="halt_snmp"
event_state="active"

[thor]
even_class="meh"
event_state=inactive

...
What would be the best way to return event_class names of all inactive and/or active events (event_state's)?

Thanks in advance,
Shane