fstrm_capture1

Usage

Overview

fstrm_capture listens on a UNIX domain or TCP socket, receives Frame Streams data, and writes the data to a file.

Options

-w filename | --write filename

Write data to the file filename.

If the --gmtime or --localtime option is given, filename is preprocessed with strftime(). This will allow specifying a format string which includes the date and time, for example, for the created filename.

If filename is "-" and standard output is not connected to a terminal, fstrm_capture will write to standard output. Output splitting (-s) may not be used with a filename of "-".

Sending SIGHUP to fstrm_capture will flush any buffered output to the file. Sending SIGUSR1 will close and reopen the file.

-t content-type | --type content-type

Specify the content-type to receive from the socket and write to the output filename.

-u socket-path | --unix socket-path

Listen on the Unix domain socket socket-path to receive Frame Streams data. Only one of -u or -a may be given.

-a IP | --tcp IP

Listen for TCP connections on address IP to receive Frame Streams data. Only one of -u or -a may be given. Use of -a requires a port given with -p.

-p port | --port port

If -a is given, listen on TCP port port to receive Frame Streams data.

-c max-conns | --maxconns max-conns

Allow at most max-conns concurrent connections. If not specified, concurrent connections are not limited.

-b buffersize | --buffersize buffersize

Set read buffer size to buffersize bytes. Combined with -c, this can be used to limit the total memory usage of fstrm_capture. The buffersize also affects the maximum frame size which fstrm_capture will accept. Frames larger than buffersize, including the 4-byte framing overhead, will be discarded.

The default buffersize is 262144 (256KiB).

-s interval | --split interval

Reopen output file every interval seconds. Requires the use of either the --gmtime or --localtime options.

Note that this file rotation is triggered by incoming data, so it may be delayed after the interval.

--gmtime

Process the --write filename through strftime() with the current time in GMT. This --gmtime option may be used to provide a timestamped output file when starting fstrm_capture or when reopening an output file using the --split option or when receiving a SIGUSR1 signal.

--localtime

Process the --write filename through strftime() with the current time in the system local time zone. This --localtime option may be used to provide a timestamped output file when starting fstrm_capture or when reopening an output file using the --split option or when receiving a SIGUSR1 signal.

-d [ -d ... ] | --debug [ --debug ]

Increase debugging level. Without -d, fstrm_capture prints only critical error messages. Up to five -d options may be specified, after which more repetitions will have no effect.

Examples

Receive dnstap data and save to hourly rotating files (with a converted filename such as /var/log/dnstap/dnstap-2018-05-04-12:58:48.fstrm).

	fstrm_capture -t protobuf:dnstap.Dnstap \
		-u /var/run/named/dnstap.sock \
		-w /var/log/dnstap/dnstap-%F-%T.fstrm \
		-s 3600 --gmtime