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7f0fb49612
It maps newer environment variable names starting with ZEEK to the legacy names starting with BRO.
99 lines
3.7 KiB
Text
99 lines
3.7 KiB
Text
##! Interface for the ASCII log writer. Redefinable options are available
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##! to tweak the output format of ASCII logs.
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##!
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##! The ASCII writer currently supports one writer-specific per-filter config
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##! option: setting ``tsv`` to the string ``T`` turns the output into
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##! "tab-separated-value" mode where only a single header row with the column
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##! names is printed out as meta information, with no "# fields" prepended; no
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##! other meta data gets included in that mode. Example filter using this::
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##!
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##! local f: Log::Filter = [$name = "my-filter",
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##! $writer = Log::WRITER_ASCII,
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##! $config = table(["tsv"] = "T")];
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##!
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module LogAscii;
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export {
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## If true, output everything to stdout rather than
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## into files. This is primarily for debugging purposes.
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##
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## This option is also available as a per-filter ``$config`` option.
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const output_to_stdout = F &redef;
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## If true, the default will be to write logs in a JSON format.
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##
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## This option is also available as a per-filter ``$config`` option.
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const use_json = F &redef;
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## Define the gzip level to compress the logs. If 0, then no gzip
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## compression is performed. Enabling compression also changes
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## the log file name extension to include ".gz".
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##
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## This option is also available as a per-filter ``$config`` option.
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const gzip_level = 0 &redef;
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## Format of timestamps when writing out JSON. By default, the JSON
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## formatter will use double values for timestamps which represent the
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## number of seconds from the UNIX epoch.
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##
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## This option is also available as a per-filter ``$config`` option.
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const json_timestamps: JSON::TimestampFormat = JSON::TS_EPOCH &redef;
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## If true, include lines with log meta information such as column names
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## with types, the values of ASCII logging options that are in use, and
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## the time when the file was opened and closed (the latter at the end).
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##
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## If writing in JSON format, this is implicitly disabled.
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const include_meta = T &redef;
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## Prefix for lines with meta information.
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##
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## This option is also available as a per-filter ``$config`` option.
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const meta_prefix = "#" &redef;
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## Separator between fields.
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##
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## This option is also available as a per-filter ``$config`` option.
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const separator = Log::separator &redef;
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## Separator between set elements.
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##
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## This option is also available as a per-filter ``$config`` option.
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const set_separator = Log::set_separator &redef;
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## String to use for empty fields. This should be different from
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## *unset_field* to make the output unambiguous.
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##
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## This option is also available as a per-filter ``$config`` option.
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const empty_field = Log::empty_field &redef;
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## String to use for an unset &optional field.
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##
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## This option is also available as a per-filter ``$config`` option.
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const unset_field = Log::unset_field &redef;
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}
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# Default function to postprocess a rotated ASCII log file. It moves the rotated
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# file to a new name that includes a timestamp with the opening time, and then
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# runs the writer's default postprocessor command on it.
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function default_rotation_postprocessor_func(info: Log::RotationInfo) : bool
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{
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# If the filename has a ".gz" extension, then keep it.
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local gz = info$fname[-3:] == ".gz" ? ".gz" : "";
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local bls = getenv("ZEEK_LOG_SUFFIX");
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if ( bls == "" )
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bls = "log";
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# Move file to name including both opening and closing time.
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local dst = fmt("%s.%s.%s%s", info$path,
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strftime(Log::default_rotation_date_format, info$open), bls, gz);
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system(fmt("/bin/mv %s %s", info$fname, dst));
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# Run default postprocessor.
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return Log::run_rotation_postprocessor_cmd(info, dst);
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}
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redef Log::default_rotation_postprocessors += { [Log::WRITER_ASCII] = default_rotation_postprocessor_func };
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