Message handler callbacks can be simplified drastically if the
dispatcher automatically replies to method calls if errors are returned.
Thus: add an sd_bus_error argument to all message handlers. When we
dispatch a message handler and it returns negative or a set sd_bus_error
we send this as message error back to the client. This means errors
returned by handlers by default are given back to clients instead of
rippling all the way up to the event loop, which is desirable to make
things robust.
As a side-effect we can now easily turn the SELinux checks into normal
function calls, since the method call dispatcher will generate the right
error replies automatically now.
Also, make sure we always pass the error structure to all property and
method handlers as last argument to follow the usual style of passing
variables for return values as last argument.
Fixes the following build errors on Fedora 20:
CC src/core/libsystemd_core_la-selinux-access.lo
src/core/selinux-access.c: In function 'get_audit_data':
src/core/selinux-access.c:245:22: error: storage size of 'ucred' isn't known
struct ucred ucred;
^
src/core/selinux-access.c:259:9: warning: implicit declaration of function 'getsockopt' [-Wimplicit-function-declaration]
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len);
^
src/core/selinux-access.c:259:28: error: 'SOL_SOCKET' undeclared (first use in this function)
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len);
^
src/core/selinux-access.c:259:28: note: each undeclared identifier is reported only once for each function it appears in
src/core/selinux-access.c:259:40: error: 'SO_PEERCRED' undeclared (first use in this function)
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len);
^
src/core/selinux-access.c:245:22: warning: unused variable 'ucred' [-Wunused-variable]
struct ucred ucred;
^
make[2]: *** [src/core/libsystemd_core_la-selinux-access.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
This removed the requirement for devices to be tagged with
'systemd-networkd' before they will be visible to networkd.
Still, as by default we don't ship any .network files, network
devices will simply be tracked, but not touched, unless the
admin configures things explicitly.
Given that plymouth listens on an abstract namespace socket and if
CLONE_NEWNET is not used the abstract namespace is shared with the host
we might actually end up send plymouth data to the host.
This patch converts PID 1 to libsystemd-bus and thus drops the
dependency on libdbus. The only remaining code using libdbus is a test
case that validates our bus marshalling against libdbus' marshalling,
and this dependency can be turned off.
This patch also adds a couple of things to libsystem-bus, that are
necessary to make the port work:
- Synthesizing of "Disconnected" messages when bus connections are
severed.
- Support for attaching multiple vtables for the same interface on the
same path.
This patch also fixes the SetDefaultTarget() and GetDefaultTarget() bus
calls which used an inappropriate signature.
As a side effect we will now generate PropertiesChanged messages which
carry property contents, rather than just invalidation information.
Returning anything else but NULL would suggest the caller's reference
might still be valid, but it isn't, because the caller just invoked
_unref() after all.
This turns the return value into a typesafe shortcut that allows
unreffing and resetting a reference in one line. In contrast to
solutions for this which take a pointer to a pointer to accomplish the
same this solution is just syntactic sugar the developer can make use of
but doesn't have to, and this is particularly useful when immediately
unreffing objects returned by function calls.
