zeek/doc/httpmonitor/file_extraction.bro

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global mime_to_ext: table[string] of string = {
["application/x-dosexec"] = "exe",
["text/plain"] = "txt",
["image/jpeg"] = "jpg",
["image/png"] = "png",
["text/html"] = "html",
};
event file_mime_type(f: fa_file, mime_type: string)
{
if ( f$source != "HTTP" )
return;
if ( mime_type !in mime_to_ext )
return;
local fname = fmt("%s-%s.%s", f$source, f$id, mime_to_ext[mime_type]);
print fmt("Extracting file %s", fname);
Files::add_analyzer(f, Files::ANALYZER_EXTRACT, [$extract_filename=fname]);
}