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The code to open journal files seems like the wrong place to enforce this. We
already check during boot and refuse to boot if machine-id is missing, no need
to enforce this here. In particular, it seems better to write logs from
journald even if they are not completely functional rather than refuse to
operate at all, and systemd-journal-remote also writes journal files and may
even be run on a system without systemd at all.
The docker image that oss-fuzz uses has an empty /etc/machine-id. Obviously
this is an error in the docker, but docker is fact of life, and it seems better
for systemd-journal-remote to work in such an incomplete environment.
We currently return -ENOMEDIUM when /etc/machine-id is empty, and -EINVAL when
it is all zeros. But -EINVAL is also used for invalid args. The distinction
between empty and all-zero is not very important, let's use the same return
code.
Also document -ENOENT and -ENOMEDIUM since they can be a bit surprising.
This is in preparation to reusing the RemoteServer in other concepts.
I tried to keep changes to minimum:
- arg_* global variables are now passed as state in RemoteServer
- exported functions get the "journal_remote_" prefix
- some variables are renamed
In particular, there is an ugly global RemoveServer* variable. It was originally
added because µhttpd did not allow state to be passed to the callbacks. I'm not
sure if this has been remediated in µhttpd, but either way, this is not changed
here, the global variable is only renamed for clarity.
This tries to improve the mac_smack_fix() logic a bit, by properly
handling non-absolute paths.
It's still pretty broken though, which is sad for security technology:
non-normalized paths (for example "/usr/../dev/sda") will still not be
treated correctly. I am not sure how to fix that properly though, and I
don't understand SMACK well enough to do so. This fix hence just fixes
to most obvious glaring issue.
This introduces several macros for defining config parsers.
Also this fixes errno in DEFINE_CONFIG_PARSE_ENUM() and _ENUMV()
and makes the log level lower when a duplicated item is
specified to the settings parsed by the function defined by
DEFINE_CONFIG_PARSE_ENUMV().
When we allocate an asynchronous match object we will allocate an
asynchronous bus call object to install the match server side.
Previously the call slot would be created as regular slot, i.e.
non-floating which meant installing the match even if it was itself
floating would result in a non-floating slot to be created internally,
which ultimately would mean the sd_bus object would be referenced by it,
and thus never be freed.
Let's fix that by making the match method callback floating in any case
as we have no interest in leaving the bus allocated beyond the match
slot.
Fixes: #8551
