Filtering signals by arguments does not work

[TomasKorbar]

Hi, for some reason i am not able to get signal filtering by argument value to work.

Reproducer

1. start monitoring dbus with # dbus-monitor --system "arg3='done'"
2. try to submit systemd job with for example # systemctl restart polkit
3. check found signal

Expected result

signal time=1716466590.572778 sender=:1.0 -> destination=(null destination) serial=5066 path=/org/freedesktop/systemd1; interface=org.freedesktop.systemd1.Manager; member=JobRemoved
uint32 4996
object path "/org/freedesktop/systemd1/job/4996"
string "polkit.service"
string "done"

Actual result

None

Context:
I am developing daemon that is listening for JobRemoved signal of systemd and i would like to receive only signal related to a service i am watching. I am using dbus-python but so far i am not able to get filtering by argument to work.
Am i missing something or is it possible that there is a bug?

Environment i am using is Fedora Rawhide.
dbus-broker-36-2

Thanks for any help.

[dvdhrm]

This looks like a bug in dbus-broker. In particular:

https:/bus1/dbus-broker/blob/main/src/bus/match.c#L425

This uses args[0] instead of args[i]. Maybe @teg can have a look at well, but I think this needs to be fixed.

[teg]

Yikes, that's a bug indeed. Mea culpa!

[dvdhrm]

Fixed via #369 and #371. Thanks a lot for the report!