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| author | Stephen Hemminger <sthemmin@microsoft.com> | 2021-12-24 22:07:40 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-12-25 15:07:40 +0900 |
| commit | 7c4bd9ac98db6f8804fca6a362a583057f6058f7 (patch) | |
| tree | 9b7174a8c603500cfed7d87f6584b3b07a40eed3 /man/busctl.xml | |
| parent | 402b81ffd8548249e846b045b10d6e8c852d2904 (diff) | |
| download | systemd-7c4bd9ac98db6f8804fca6a362a583057f6058f7.tar.gz | |
bus-dump: change capture output to use pcapng (#21738)
This patch changes busctl capture to generate pcapng format
instead of the legacy pcap format files. It includes basic
meta-data in the file and still uses microsecond time
resolution. In future, more things can be added such as
high resolution timestams, statistics, etc.
PCAP Next Generation capture file format is what tshark uses
and is in process of being standardized in IETF. It is also
readable with libpcap.
$ capinfos /tmp/new.pcapng
File name: /tmp/new.pcapng
File type: Wireshark/... - pcapng
File encapsulation: D-Bus
File timestamp precision: microseconds (6)
Packet size limit: file hdr: (not set)
Packet size limit: inferred: 4096 bytes
Number of packets: 22
File size: 21kB
Data size: 20kB
Capture duration: 0.005694 seconds
First packet time: 2021-12-11 11:57:42.788374
Last packet time: 2021-12-11 11:57:42.794068
Data byte rate: 3,671kBps
Data bit rate: 29Mbps
Average packet size: 950.27 bytes
Average packet rate: 3,863 packets/s
SHA256: b85ed8b094af60c64aa6d9db4a91404e841736d36b9e662d707db9e4096148f1
RIPEMD160: 81f9bac7ec0ec5cd1d55ede136a5c90413894e3a
SHA1: 8400822ef724b934d6000f5b7604b9e6e91be011
Strict time order: True
Capture oper-sys: Linux 5.14.0-0.bpo.2-amd64
Capture application: systemd 250 (250-rc2-33-gdc79ae2+)
Number of interfaces in file: 1
Interface #0 info:
Encapsulation = D-Bus (146 - dbus)
Capture length = 4096
Time precision = microseconds (6)
Time ticks per second = 1000000
Number of stat entries = 0
Number of packets = 22
Diffstat (limited to 'man/busctl.xml')
| -rw-r--r-- | man/busctl.xml | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/man/busctl.xml b/man/busctl.xml index cc5a6508ef..bcd3f4805e 100644 --- a/man/busctl.xml +++ b/man/busctl.xml @@ -78,10 +78,10 @@ <term><command>capture</command> <arg choice="opt" rep="repeat"><replaceable>SERVICE</replaceable></arg></term> <listitem><para>Similar to <command>monitor</command> but - writes the output in pcap format (for details, see the <ulink - url="https://wiki.wireshark.org/Development/LibpcapFileFormat">Libpcap - File Format</ulink> description). Make sure to redirect - standard output to a file. Tools like + writes the output in pcapng format (for details, see + <ulink url="https://github.com/pcapng/pcapng/"> + PCAP Next Generation (pcapng) Capture File Format</ulink>). + Make sure to redirect standard output to a file or pipe. Tools like <citerefentry project='die-net'><refentrytitle>wireshark</refentrytitle><manvolnum>1</manvolnum></citerefentry> may be used to dissect and view the resulting files.</para></listitem> |