graphs: Render an empty graph if there are no sources

Graphs like temperature graphs don't have any data sources whatsoever
for example in a virtual machine. Because rrdtool would normally fail,
we will instead create an empty graph that even has the correct labels
and shows a note at the bottom.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

args: Add function to check if any sources have been added

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Remove unused EMPTY_LINE macro

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

source: Disable sources where we cannot find the command

So basically if something has not been installed, we won't try to
relaunch it again and again. But that also means that the daemon needs
to be restarted after something else has been added.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

command: Map back any negative return codes

This is not perfect, but should be good enough since applications
normally don't use any return codes larger than 128.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

command: Remove return code from success callback

It will always be zero.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

command: Add a failure callback

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: main: Group any arguments into a new struct

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: main: Make the path configurable on command line

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

source: Fetch the daemon's path

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Allow to configure the database path

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a graph for Knot Resolver's queries

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

jenkins: Build for Fedora 44

This also drops Fedora 42.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Remove Transifex configuration

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sources: Collect metrics for Knot Resolver

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

metrics: Add convenience function to extract metrics from JSON

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

metrics: Allow to push multiple values

We will just sum the data because there are sometimes sources that have
multiple metrics that we need to aggregate - for example counters per
worker/thread.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sources: Add source for wireless interface stats

This is unfinished, but I currently cannot work on this.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

netlink: Add a helper function to enumerate all wireless interfaces

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (Italian)

Currently translated at 56.1% (64 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/it/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (Spanish)

Currently translated at 100.0% (114 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/es/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (Lao)

Currently translated at 100.0% (114 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/lo/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Added translation using Weblate (Lao)

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (Spanish)

Currently translated at 17.5% (20 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/es/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (German)

Currently translated at 92.9% (106 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (German)

Currently translated at 92.9% (106 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (German)

Currently translated at 83.3% (95 of 114 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Update translation files

Updated by "Update PO files to match POT (msgmerge)" add-on in Weblate.

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

po: Update translations

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Cast pointers to suppress some warnings

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Convert the other units as well

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: memory: Refactor the entire legend

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Split BYTES into two macros

The preprocessor cannot split things as we would need although it
sometimes works in a few places.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a macro to add headlines

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Set base = 1024 where dealing with bytes

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Enable pango markup

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

netlink: Move all netlink stuff away

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

netlink: Start scaffolding to move all netlink stuff

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Retrieve and cache the nl80211 ID separately

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Add a handler to fetch a nl80211 socket

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

libnl: Link against libnl3-genl

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Update translation files

Updated by "Update PO files to match POT (msgmerge)" add-on in Weblate.

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (German)

Currently translated at 86.3% (95 of 110 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: memory: Plot the correct percentage fields

We have been printing the raw bytes instead.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sensors: Remove a dead assignement

r does not have to be reset here.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Fix column widths for units

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a Processor Power Consumption graph

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

po: Update translations

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a system temperature graph

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor temperature: Don't start the graph at zero

Theoretically, sub-zero temperatures are possible

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor temperature: Make the supported sensors static

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Declare the state struct globally

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a processor temperature graph

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

string: Add a couple more pattern matching functions

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Terminate the event loop if we fail to initialize

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sensors: Add a helper "function" to determine the chip name

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sensors: Constify the subfeature type

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sensors: Generalize processing all sensors

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graph: Fetch temperature unit from locale

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sources: disk: Store power-on time in seconds

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Update translation files

Updated by "Update PO files to match POT (msgmerge)" add-on in Weblate.

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

priv: Don't drop CAP_SYS_RAWIO

We require this for raw device access to read SMART data from disks.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Pass correct pointer to the memory pressure function

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor: Use NaN-safe addition

This is needed so that we can import incomplete data from collectd where
guest and guest_nice don't exist. We will just treat those values as
zero.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

po: Update translation

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

jenkins: Build for Fedora Rawhide

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

jenkins: Build for Ubuntu 26.04

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

jenkins: Always pull the latest version of Docker containers

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

jenkins: Try to update Archlinux' keyring before installing packages

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

bus: Log if we cannot connect to dbus

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

dbus: Update policy so that the unprivileged user can connect

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

command: Remove debugging line

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

legacy-gateway-latency4: Remove any capabilities

The capabilities should actually come from the binaries.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Further limit capabilities of commands

Commands must have their capabilities set if they require any. Otherwise
they will be running as an unprivileged user without any capabilities.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

priv: Properly fail if we could not find the daemon user

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

configure: Allow to specify the daemon user

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

daemon: Drop privileges after start

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

telemetryd: Add switch to run as a non-privileged user

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

configure: Depend on libcap

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

Translated using Weblate (German)

Currently translated at 84.3% (86 of 102 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/

Update translation files

Updated by "Update PO files to match POT (msgmerge)" add-on in Weblate.

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/

Translated using Weblate (German)

Currently translated at 88.0% (74 of 84 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/

Translated using Weblate (German)

Currently translated at 83.3% (70 of 84 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/

Translated using Weblate (German)

Currently translated at 83.3% (70 of 84 strings)

Translation: Telemetry/Telemetry
Translate-URL: https://translate.ipfire.org/projects/telemetry/telemetry/de/

graphs: unbound: Add a graphs with total queries

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Create a new vlabel function for "Percent"

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor: Move the header to the right place

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor: Invert the graph

That way, the data, especially for the smaller fields is getting much
clearer.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: memory: Don't zoom out

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: processor: Don't zoom out

This changes that the graph will always scale up to 100%, but we will
see more detail.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

colors: Improve the colors of the grid

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graph: Show the hostname at the bottom of the image

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

colors: Generate a proper color palette

This patch also assigns a lot of the colors to specific use cases that
we will have a consistent language throughout all graphs. We want to
ensure that signal colors are only used for this use-case for instance.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: suricata: Draw the area outlines correctly

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

colors: Make areas less opaque

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a graph for dropped packets from/to hostile networks

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Add a graph to show port scans

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

configure: Re-add the processor source

I seem to have forgotten this.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

sources: Add a source to collect OpenVPN client traffic

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

graphs: Create a graph for interface packets

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>