zeek/scripts/policy/frameworks/intel/seen/smtp-url-extraction.zeek
Benjamin Bannier d5fd29edcd Prefer explicit construction to coercion in record initialization
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);
2025-07-11 16:28:37 -07:00

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@load base/frameworks/intel
@load base/protocols/smtp
@load base/utils/urls
@load ./where-locations
event intel_mime_data(f: fa_file, data: string) &group="Intel::URL"
{
if ( ! f?$conns )
return;
for ( cid, c in f$conns )
{
local urls = find_all_urls_without_scheme(data);
for ( url in urls )
{
Intel::seen(Intel::Seen($indicator=url,
$indicator_type=Intel::URL,
$conn=c,
$where=SMTP::IN_MESSAGE));
}
}
}
event file_new(f: fa_file) &group="Intel::URL"
{
if ( f$source == "SMTP" )
Files::add_analyzer(f, Files::ANALYZER_DATA_EVENT, Files::AnalyzerArgs($stream_event=intel_mime_data));
}