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Large update for the SumStats framework.

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- On-demand access to sumstats results through "return from"
   functions named SumStats::request and Sumstats::request_key.
   Both functions are tested in standalone and clustered modes.

 - $name field has returned to SumStats which simplifies cluster
   code and makes the on-demand access stuff possible.

 - Clustered results can only be collected for 1 minute from their
   time of creation now instead of time of last read.

 - Thresholds use doubles instead of counts everywhere now.

 - Calculation dependency resolution occurs at start up time now
   instead of doing it at observation time which provide a minor
   cpu performance improvement.  A new plugin registration mechanism
   was created to support this change.

 - AppStats now has a minimal doc string and is broken into hook-based
   plugins.

 - AppStats and traceroute detection added to local.bro
This commit is contained in:
Seth Hall 2013-05-21 15:52:59 -04:00
parent 7d7d30e1f7
commit bec965b66f
34 changed files with 687 additions and 277 deletions
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9
scripts/policy/misc/detect-traceroute/main.bro
View file

@ -29,7 +29,7 @@ export {
## Defines the threshold for ICMP Time Exceeded messages for a src-dst pair.
## This threshold only comes into play after a host is found to be
## sending low ttl packets.
const icmp_time_exceeded_threshold = 3 &redef;
const icmp_time_exceeded_threshold: double = 3 &redef;
## Interval at which to watch for the
## :bro:id:`ICMPTimeExceeded::icmp_time_exceeded_threshold` variable to be crossed.
@ -57,16 +57,17 @@ event bro_init() &priority=5
local r1: SumStats::Reducer = [$stream="traceroute.time_exceeded", $apply=set(SumStats::UNIQUE)];
local r2: SumStats::Reducer = [$stream="traceroute.low_ttl_packet", $apply=set(SumStats::SUM)];
SumStats::create([$epoch=icmp_time_exceeded_interval,
SumStats::create([$name="traceroute-detection",
$epoch=icmp_time_exceeded_interval,
$reducers=set(r1, r2),
$threshold_val(key: SumStats::Key, result: SumStats::Result) =
{
# Give a threshold value of zero depending on if the host
# sends a low ttl packet.
if ( require_low_ttl_packets && result["traceroute.low_ttl_packet"]$sum == 0 )
return 0;
return 0.0;
else
return result["traceroute.time_exceeded"]$unique;
return result["traceroute.time_exceeded"]$unique+0;
},
$threshold=icmp_time_exceeded_threshold,
$threshold_crossed(key: SumStats::Key, result: SumStats::Result) =