Mirror/zeek
1
0
Fork 0
mirror of https://github.com/zeek/zeek.git synced 2025-10-13 03:58:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

Prefer explicit construction to coercion in record initialization

Browse source 
While we support initializing records via coercion from an expression
list, e.g.,

    local x: X = [$x1=1, $x2=2];

this can sometimes obscure the code to readers, e.g., when assigning to
value declared and typed elsewhere. The language runtime has a similar
overhead since instead of just constructing a known type it needs to
check at runtime that the coercion from the expression list is valid;
this can be slower than just writing the readible code in the first
place, see #4559.

With this patch we use explicit construction, e.g.,

    local x = X($x1=1, $x2=2);
This commit is contained in:
Benjamin Bannier 2025-07-10 09:42:44 +02:00 • committed by Christian Kreibich
parent 54f9e45597
commit d5fd29edcd
139 changed files with 786 additions and 788 deletions
Download patch file Download diff file Expand all files Collapse all files

60
scripts/policy/misc/detect-traceroute/main.zeek
View file

@ -57,35 +57,35 @@ export {
event zeek_init() &priority=5
{
Log::create_stream(Traceroute::LOG, [$columns=Info, $ev=log_traceroute, $path="traceroute", $policy=log_policy]);
Log::create_stream(Traceroute::LOG, Log::Stream($columns=Info, $ev=log_traceroute, $path="traceroute", $policy=log_policy));
local r1: SumStats::Reducer = [$stream="traceroute.time_exceeded", $apply=set(SumStats::UNIQUE)];
local r2: SumStats::Reducer = [$stream="traceroute.low_ttl_packet", $apply=set(SumStats::SUM)];
SumStats::create([$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 0.0;
else
return result["traceroute.time_exceeded"]$unique+0;
},
$threshold=icmp_time_exceeded_threshold,
$threshold_crossed(key: SumStats::Key, result: SumStats::Result) =
{
local parts = split_string_n(key$str, /-/, F, 2);
local src = to_addr(parts[0]);
local dst = to_addr(parts[1]);
local proto = parts[2];
Log::write(LOG, [$ts=network_time(), $src=src, $dst=dst, $proto=proto]);
NOTICE([$note=Traceroute::Detected,
$msg=fmt("%s seems to be running traceroute using %s", src, proto),
$src=src,
$identifier=cat(src,proto)]);
}]);
local r1 = SumStats::Reducer($stream="traceroute.time_exceeded", $apply=set(SumStats::UNIQUE));
local r2 = SumStats::Reducer($stream="traceroute.low_ttl_packet", $apply=set(SumStats::SUM));
SumStats::create(SumStats::SumStat($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 0.0;
else
return result["traceroute.time_exceeded"]$unique+0;
},
$threshold=icmp_time_exceeded_threshold,
$threshold_crossed(key: SumStats::Key, result: SumStats::Result) =
{
local parts = split_string_n(key$str, /-/, F, 2);
local src = to_addr(parts[0]);
local dst = to_addr(parts[1]);
local proto = parts[2];
Log::write(LOG, Info($ts=network_time(), $src=src, $dst=dst, $proto=proto));
NOTICE(Notice::Info($note=Traceroute::Detected,
$msg=fmt("%s seems to be running traceroute using %s", src, proto),
$src=src,
$identifier=cat(src,proto)));
}));
}
# Low TTL packets are detected with a signature.
@ -93,11 +93,11 @@ event signature_match(state: signature_state, msg: string, data: string)
{
if ( state$sig_id == /traceroute-detector.*/ )
{
SumStats::observe("traceroute.low_ttl_packet", [$str=cat(state$conn$id$orig_h,"-",state$conn$id$resp_h,"-",get_port_transport_proto(state$conn$id$resp_p))], [$num=1]);
SumStats::observe("traceroute.low_ttl_packet", SumStats::Key($str=cat(state$conn$id$orig_h,"-", state$conn$id$resp_h, "-", get_port_transport_proto(state$conn$id$resp_p))), SumStats::Observation($num=1));
}
}
event icmp_time_exceeded(c: connection, info: icmp_info, code: count, context: icmp_context)
{
SumStats::observe("traceroute.time_exceeded", [$str=cat(context$id$orig_h,"-",context$id$resp_h,"-",get_port_transport_proto(context$id$resp_p))], [$str=cat(c$id$orig_h)]);
SumStats::observe("traceroute.time_exceeded", SumStats::Key($str=cat(context$id$orig_h,"-", context$id$resp_h, "-", get_port_transport_proto(context$id$resp_p))), SumStats::Observation($str=cat(c$id$orig_h)));
}