First of all, it's frickin' ugly and wrong, as IPC sockets should be
placed in /run and definitely not under a guessable name under
world-writable /tmp. Secondly, it can't even work as we set
PrivateTmp=yes on the service.
Hence, let's clean up the example, and simply use a socket in /run
instead.
Fixes: #8419
To indicate that the there're no more entries, these wrappers return false but
did leave the passed pointed unmodified.
However EOF is not an error and is a very common case so initialize the output
argument to NULL even in this case so callers don't need to do that.
Fixes: #8721
We check the same condition at various places. Let's add a trivial,
common helper for this, and use it everywhere.
It's not going to make things much faster or much shorter, but I think a
lot more readable
Before this patch we'd resolve all symlinks of bind mounts and other
mount points to establish for a service in advance, and only then start
mounting them. This is problematic, if symlink chains jump around
between directories in a namespace tree, so that to resolve a specific
symlink chain we need to establish another mount already. A typical case
where this happens is if /etc/resolv.conf is a symlink to some file in
/run: in that case we'd normally resolve and mount /etc/resolv.conf
early on, but that's broken, as to do this properly we'd need to resolve
/etc/resolv.conf first, then figure out that /run needs to be mounted
before we can proceed, and thus reorder the order in which we apply
mounts dynamically.
With this change, whenever we are about to apply a mount, we'll do a
single step of the symlink normalization process, patch the mount entry
accordingly, and then sort the list of mounts to establish again, taking
the new path into account. This means that we can correctly deal with
the example above: we might start with wanting to mount /etc/resolv.conf
early, but after resolving it to the path in /run/ we'd push it to the
end of the list, ensuring that /run is mounted first.
(Note that this also fixes another bug: we were following symlinks on
the bind mount source relative to the root directory of the service,
rather than of the host. That's wrong though as we explicitly document
tha the source of bind mounts is always on the host.)
If the flag is set only a single step of the normalization is executed,
and the resulting path is returned.
This allows callers to normalize piecemeal, taking into account every
single intermediary path of the normalization.
We have plenty of code in our codebase that outputs tables to the
console, and all is homegrown and awful. Let's replace it with a generic
implementation that can do automatically what the old implementations
did manually.
Features:
1. Ellipsation (for fields overly long) and alignment (for
fields overly short)
2. Sorting of rows
3. automatically copies formatting from the same cell in the row above
4. Heavy use of varargs to make putting together tables easy
5. can expand and compress tables, with weights
6. Has a minimal understanding of unicode wide characters in order to
match unicode strings to character cell terminals.
7. Columns can be reordered and individually turned off.
8. pretty printing for various data types
And more.
pager.[ch] doesn't use any APIs from src/libsystemd/ or src/shared/
hence there's no reason for it to be in src/shared/, let's move it to
src/basic/ instead.
This enables us to use pager.[ch] APIs from other code in src/basic/,
for example pager_have() and suchlike.
This primarily changes to things:
1. Ellipsation to 0, 1 or 2 characters is now supported. Previously we'd
hit an assert if the new lengths was < 3, this is now permitted. The
result strings won't show too much info still of course, but the code
becomes a bit more generic and robust to use.
2. If a UTF-8 mode is disabled and the input string is pure ASCII, then
"..." is used for ellipsation, otherwise (as before) "…". This means
on a pure-ASCII system we should remain pure-ASCII, matching
behaviour otherwise exposed with special_glyph() and friends. Note
that we'll use "…" for ellipsiation as soon as either the locale
settings indicate an UTF-8 mode or the input string already contains
non-ASCII unicode characters.
Testing for these special cases is improved.
We have a common parser, but for the user it might be
completely unobvious that the same general rules apply
to all those files. Let's add a page about the basic syntax
so that the more specific pages don't have to repeat those
details.
The NULSTR_FOREACH iterator needs to see an empty string at the end, so
we need to insert an extra NUL explicitly.
Also update PATH0_BIN_SBIN(x) to include an extra NUL terminator, rename
it to PATH_BIN_SBIN_NULSTR(x), which is more consistent with the similar
CONF_PATHS_NULSTR(x) macro.
Fixes: 5008da1ec1
This also introduces `manager_is_connected()` helper function, which
returns true when the manager is sending a request, resolving a server
name, or in a poll interval.
Follow-up for 3e85ec0721.
Fixes#8719.
A couple of minor modernizations:
1. Don't unnecessarily export functions we don't call outside of
machined.c
2. Use cleanup logic for the manager object.
3. Propagate errors properly from manager_new(). So far if
sd_event_new() returns EMFILE/ENFILE for some reason we would have
logged that as log_oom(), which isn#t right, really.
4. Handle SIGTERM/SIGINT cleanly. It's easy, and prettier then letting
the kernel just abort us. It also makes it possible to valgrind
machined properly.
The dhcp4 code sets link->dhcp4_configured when dhcp4_route_handler()
has processed the last message.
However, in case UseRoutes=no has been set in the [DHCP] section, or
in case the DHCP server simply sends no routes, link_set_dhcp_routes()
will not send any netlink messages and dhcp4_route_handler() will
therefore never be called.
This causes the link to never reach LINK_STATE_CONFIGURED, and e.g.
systemd-networkd-wait-online will not consider the link as ready.
Fix that by setting link->dhcp4_configured = true and calling
link_check_ready() in dhcp4_address_handler() in case
link_set_dhcp_routes() sent no netlink messages (dhcp4_messages is
zero).
In some situation if networkd fails to get the network file
then networkd crashes becasse the link->network is not initalized;
```
veth99: Failed to get network dhcp-client-ipv4-only: No such file or directory
Segmentation fault
gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/sus/tt/systemd/build/systemd-networkd
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
Program received signal SIGSEGV, Segmentation fault.
link_load (link=0x55555582ccd0) at ../src/network/networkd-link.c:2973
2973 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
(gdb) bt
(gdb) p link->network
$1 = (Network *) 0x0
(gdb) list
2968 if (r < 0) {
2969 log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
2970 goto dhcp4_address_fail;
2971 }
2972
2973 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
2974 if (r < 0)
2975 return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
2976
2977 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
(gdb) r
```
