A list of available D-Bus services

Is there such a thing as list of available D-Bus services?
I’ve stumbled upon a few, like those provided by NetworkManager, Rhythmbox, Skype, HAL.

I wonder if I can find a rather complete list of provided services/interfaces.

Answers:

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Method 1

On QT setups (short commands and clean, human readable output) you can run:

qdbus

will list list the services available on the session bus and

qdbus --system

will list list the services available on the system bus.

On any setup you can use dbus-send

dbus-send --print-reply --dest=org.freedesktop.DBus  /org/freedesktop/DBus org.freedesktop.DBus.ListNames

Just like qdbus, if --session or no message bus is specified, dbus will send to the login session message bus. So the above will list the services available on the session bus.
Use --system if you want instead to use the system wide message bus:

dbus-send --system --print-reply --dest=org.freedesktop.DBus  /org/freedesktop/DBus org.freedesktop.DBus.ListNames

You could also use DFeet if you prefer a graphical tool (see the other answers for more GUI options).

Method 2

With Python it can be simpler.

System services:

import dbus
for service in dbus.SystemBus().list_names():
    print(service)

Session services:

import dbus
for service in dbus.SessionBus().list_names():
    print(service)

Method 3

qdbusviewer is your best friend; it allows you to send D-bus messages as well:

Method 4

gdbus is part of glib2 and supports Bash completions. Here is how to use it (on Fedora):

bash-4.4$ source /usr/share/bash-completion/completions/gdbus
bash-4.4$ gdbus call --system --dest <TAB><TAB>

This will show all possible destinations. To get a list of the available interfaces DBus exports the org.freedesktop.DBus.ListNames method. You can call it by running:

gdbus call --system --dest org.freedesktop.DBus 
           --object-path /org/freedesktop/DBus  
           --method org.freedesktop.DBus.ListNames

Unfortunately this leads to unreadable output. Fortunately the output is valid python, so this is possible:

gdbus call --system --dest org.freedesktop.DBus      
           --object-path /org/freedesktop/DBus       
           --method org.freedesktop.DBus.ListNames | 
    python -c 'import sys, pprint; pprint.pprint(eval(sys.stdin.read()))'

I don’t usually do this, but is a nice trick to keep on sleeve. I use gdbus for introspecting and proving concepts before moving to code. The bash completion saves a lot of typing and avoid typos. Would be nice to have gdbus displaying a nicer output.

Method 5

I would recommend also dasbus

from dasbus.connection import SystemMessageBus

bus = SystemMessageBus()
busproxy = bus.proxy
for i in sorted(busproxy.ListNames()):
    print(i)

(Substitute SessionMessageBus for the session bus.)

From the shell, on systemd systems there is busctl

busctl list

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0