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GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
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This is a continuation of the previous include sort patch, which
only sorted for .c files.
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siphash24: let siphash24_finalize() and siphash24() return the result…
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Rather than passing a pointer to return the result, return it directly
from the function calls.
Also, return the result in native endianess, and let the callers care
about the conversion. For hash tables and bloom filters, we don't care,
but in order to keep MAC addresses and DHCP client IDs stable, we
explicitly convert to LE.
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Sort the includes accoding to the new coding style.
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Add a few includes that we rely on to be include already.
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Change the "out" parameter from uint8_t[8] to uint64_t. On architectures which
enforce pointer alignment this fixes crashes when we previously cast an
unaligned array to uint64_t*, and on others this should at least improve
performance as the compiler now aligns these properly.
This also simplifies the code in most cases by getting rid of typecasts. The
only place which we can't change is struct duid's en.id, as that is _packed_
and public API, so we can't enforce alignment of the "id" field and have to
use memcpy instead.
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actually enabled
Otherwise we might end up mistaking a SMACK label for an selinux label.
Also, fixes unexpect debug messages:
http://lists.freedesktop.org/archives/systemd-devel/2015-November/034913.html
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capability-util.[ch]
The files are named too generically, so that they might conflict with
the upstream project headers. Hence, let's add a "-util" suffix, to
clarify that this are just our utility headers and not any official
upstream headers.
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There are more than enough to deserve their own .c file, hence move them
over.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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This really deserves its own file, given how much code this is now.
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pthread APIs (unlike the rest of libc) return their errors as positive
error codes directly from the functions, rather than using errno. Let's
make sure we always handle things that way.
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Make sure all variable-length inputs are properly terminated or that
their length is encoded in some way. This avoids ambiguity of
adjacent inputs.
E.g., in case of a hash function taking two strings, compressing "ab"
followed by "c" is now distinct from "a" followed by "bc".
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All our hash functions are based on siphash24(), factor out
siphash_init() and siphash24_finalize() and pass the siphash
state to the hash functions rather than the hash key.
This simplifies the hash functions, and in particular makes
composition simpler as calling siphash24_compress() repeatedly
on separate chunks of input has the same effect as first
concatenating the input and then calling siphash23_compress()
on the result.
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This also allows us to drop build.h from a ton of files, hence do so.
Since we touched the #includes of those files, let's order them properly
according to CODING_STYLE.
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Also, make it slightly more powerful, by accepting a flags argument, and
make it safe for handling if more than one cmsg attribute happens to be
attached.
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This introduces two new helpers alongside sd_bus_path_{encode,decode}(),
which work similarly to their counterparts, but accept a format-string as
input. This allows encoding and decoding multiple labels of a format
string at the same time.
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Add a 'destination' match rule for every SERVICE argument in addition to
the 'sender' rule. This is consistent with busctl(1), which documents
monitor as dumping "messages to or from this peer".
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sd-bus: introduce new sd_bus_default_flush_close() call
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Let's underline the header line of the table shown by cgtop, how it is
customary for tables. In order to do this, let's introduce new ANSI
underline macros, and clean up the existing ones as side effect.
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If code enqueues a message on one of the default busses, but doesn't
sync on it, and immediately drops the reference to the bus again, it
will stay queued and consume memory. Intrdouce a new call
sd_bus_default_flush_close() that can be invoked at the end of programs
(or threads) and flushes out all unsent messages on any of the default
busses.
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The size of the allocated array for received file descriptors was
incorrectly calculated. This did not matter when a single file
descriptor was received, but for more descriptors the allocation was
insufficient.
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Make sure the assert expression is not macro-expanded before
stringification. This makes several assertion failure messages more
readable.
As an example:
assert(streq("foo", "bar"));
I'd rather see this:
Assertion 'streq("foo", "bar")' failed at foo.c:5, function main(). Aborting.
...than this, though awesome, incomprehensible truncated mess:
Assertion '(__extension__ ({ size_t __s1_len, __s2_len; (__builtin_constant_p ((
"foo")) && __builtin_constant_p (("bar")) && (__s1_len = strlen (("foo")), __s2_
len = strlen (("bar")), (!((size_t)(const void *)((("foo")) + 1) - (size_t)(cons
t void *)(("foo")) == 1) || __s1_len >= 4) && (!((size_t)(const void *)((("bar")
) + 1) - (size_t)(const void *)(("bar")) == 1) || __s2_len >= 4)) ? __builtin_st
rcmp (("foo"), ("bar")) : (__builtin_constant_p (("foo")) && ((size_t)(const voi
d *)((("foo")) + 1) - (size_t)(const void *)(("foo")) == 1) && (__s1_len = strle
n (("foo")), __s1_len < 4) ? (__builtin_constant_p (("bar")) && ((size_t)(const
void *)((("bar")) + 1) - (size_t)(const void *)(("bar")) == 1) ? __builtin_strcm
p (("foo"), ("bar")) : (__extension__ ({ const unsigned char *__s2 = (const unsi
gned char *) (const char *) (("bar")); int __result = (((const unsigned char *)
(const char *) (("foo")))[0] - __s2[0]); if (__s1_len > 0 && __result == 0) { __
result = (((const unsigned char *) (const char *) (("foo")))[1] - __s2[1]); if (
__s1_len > 1 && __result == 0) { __result = (((const unsigned char *) (const cha
r *) (("foo")))[2] - __s2[2]); if (__s1_len > 2 && __result == 0) __result = (((
const unsigned char *) (const char *) (("foo")))[3] - __s2[3]); } } __result; })
)) : (__builtin_constant_p (("bar")) && ((size_t)(const void *)((("bar")) + 1) -
(size_t)(const void *)(("bar")) == 1) && (__s2_len = strlen (("bar")), __s2_len
< 4) ? (__builtin_constant_p (("foo")) && ((size_t)(const void *)((("foo")) + 1
) - (size_t)(const void *)(("foo")) == 1) ? __builtin_strcmp (("foo"), ("bar"))
: (- (__extension__ ({ const unsigned char *__s2 = (const unsigned char *) (cons
t char *) (("foo")); int __result = (((const unsigned char *) (const char *) (("
bar")))[0] - __s2[0]); if (__s2_len > 0 && __result == 0) { __result = (((const
unsigned char *) (const char *) (("bar")))[1] - __s2[1]); if (__s2_len > 1 && __
result == 0) { __result = (((const unsigned char *) (const char *) (("bar")))[2]
- __s2[2]); if (__s2_len > 2 && __result == 0)
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off_t is a really weird type as it is usually 64bit these days (at least
in sane programs), but could theoretically be 32bit. We don't support
off_t as 32bit builds though, but still constantly deal with safely
converting from off_t to other types and back for no point.
Hence, never use the type anymore. Always use uint64_t instead. This has
various benefits, including that we can expose these values directly as
D-Bus properties, and also that the values parse the same in all cases.
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Another Coccinelle patch.
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util: introduce safe_fclose() and port everything over to it
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Adds a coccinelle script to port things over automatically.
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We should never put empty lines between `if` and `else if`, unless we use
braces.
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Patch via coccinelle.
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This replaces this:
free(p);
p = NULL;
by this:
p = mfree(p);
Change generated using coccinelle. Semantic patch is added to the
sources.
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When forking of a child process for connecting to a container, pass
the preicse connection error to the calling process.
We already did this correctly for kdbus busses, let's do so for dbus1
busses, too.
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sd-bus: make introspection data non-recursive
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Currently, our introspection data looks like this:
<node>
<interface name="org.freedesktop.DBus.Peer">
...
</interface>
<interface name="org.freedesktop.DBus.Introspectable">
...
</interface>
<interface name="org.freedesktop.DBus.Properties">
...
</interface>
<node name="org"/>
<node name="org/freedesktop"/>
<node name="org/freedesktop/login1"/>
<node name="org/freedesktop/login1/user"/>
<node name="org/freedesktop/login1/user/self"/>
<node name="org/freedesktop/login1/user/_1000"/>
<node name="org/freedesktop/login1/seat"/>
<node name="org/freedesktop/login1/seat/self"/>
<node name="org/freedesktop/login1/seat/seat0"/>
<node name="org/freedesktop/login1/session"/>
<node name="org/freedesktop/login1/session/self"/>
<node name="org/freedesktop/login1/session/c1"/>
</node>
(ordered alphabetically for better visibility)
This is grossly incorrect. The spec says that we're allowed to return
non-directed children, however, it does not allow us to return data
recursively in multiple parents. If we return "org", then we must not
return anything else that starts with "org/".
It is unclear, whether we can include child-nodes as a tree. Moreover, it
is usually not what the caller wants. Hence, this patch changes sd-bus to
never return introspection data recursively. Instead, only a single
child-layer is returned.
This patch relies on enumerators to never return hierarchies. If someone
registers an enumerator via sd_bus_add_enumerator, they better register
sub-enumerators if they support *TRUE* hierarchies. Each enumerator is
treated as a single layer and not filtered.
Enumerators are still allowed to return nested data. However, that data
is still required to be a single hierarchy. For instance, returning
"/org/foo" and "/com/bar" is fine, but including "/com" or "/org" in that
dataset is not.
This should be the default for enumerators and I see no reason to filter
in sd-bus. Moreover, filtering that data-set would require to sort the
strv by path and then do prefix-filtering. This is O(n log n), which
would be fine, but still better to avoid.
Fixes #664.
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Whenever we run in a user context, sd_bus_{default_user,open_user}() and
friends should always connect to the user-bus of the current context,
instead of deriving the uid from getuid(). This allows us running
programs via sudo/su, without the nasty side-effect of accidentally
connecting to the root user-bus.
This patch enforces the idea of making su/sudo *not* opening sessions by
default. That is, all they do is raising privileges, but keeping
everything set as before. You can still use su/sudo to open real sessions
by requesting a login-session (or loading pam_systemd otherwise).
However, in this case XDG_RUNTIME_DIR= will not be set (as usual in these
cases), hence, you will not be able to connect to *any* user-bus.
Long story short: With this patch applied, both:
- ./busctl --user
- sudo ./busctl --user
..will successfully connect to the user-bus of the local user.
Fixes #390.
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A variety of sd-event, sd-login and cgroup fixes
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Commit efdb023 ("core: unified cgroup hierarchy support") introduced a new
error ENOEXEC in cg_unified() if /sys/fs/cgroup/ is not available. Adjust the
"skip" checks in various tests accordingly.
Add a corresponding "skip" check to test-bus-creds as well, as
sd_bus_creds_new_from_pid() now calls cg_unified() as well.
This re-fixes "make check" in build chroots without /sys/fs/cgroup.
https://github.com/systemd/systemd/issues/1132
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session
ENODATA is how we usually indicate such "missing info" cases, so we
should do this here, too.
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We should never connect to the host bus as fallback if connecting to a
container failed via one method. Otherwise connecting to a dbus1
container will always result in a connection to the host.
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