getsyshwaddr assumed that the first ifaddr it came across was the MAC
address, and as such assumes that it has the right length. After
upgrading to OS X 10.13.4, this causes minidlnad to crash on startup due
to tripping stack smash protection -- I'm not sure if the order of
addresses returned previously happened to accidentally hit this
invariant, or if this was always an issue and the stack smash protection
got smarter.
In any event, we just need to look for the AF_LINK address and use that.
As an extra check, we make sure the length is the length we expect to
copy into the target buffer.
The idea is taken from the nginx web server, but much simplified and
almost no copypaste left. This will allow minidlna to use different
event dispatcher APIs, which would be defined at compile time.
My personal goal is to convert minidlna to kqueue(2) on FreeBSD. This
would later allow for kqueue based directory change notification, which
won't conflict with select(2) like the current patch does.
Other platforms will also benefit from the pluggability of the event
system, Linux can switch to epoll(2) or at least to poll(2).
Detailed list of changes:
* event.h [New]
Our internal API to unify different event dispatch systems.
* select.c [New]
Much simplified version of nginx's ngx_select_module.c.
* minidlna.c
- Split out listen socket event processing into separate function
ProcessListen(), which matches event_process_t type.
- Create and initialize struct event for the monitor socket, SSDP
socket, HTTP socket and beacon socket.
- Simplify and make more precise timeout calculation using
helper timeval functions from utils.c. Treat gettimeofday() error
as a fatal event.
- Rip out all stuff related to select(2). Just call event_module.process().
* upnpevents.c
- Embed struct event into upnp_event_notify.
- Merge upnp_event_create_notify() with upnp_event_notify_connect().
Start connecting immediately after socket creation. Garbage collect
now useless ECreated state.
- Make upnp_event_process_notify() of event_process_t type, and use it
as process callback for upnp_event_notify event.
- Looks like we always create upnp_event_notify with existing subscriber,
and never clear it later. Remove checks for obj->sub and assert that it
is never NULL. Simplifies things.
- When switching obj state, add/del it to event dispatcher accrodingly.
- Garbage collect upnpevents_selectfds().
- Garbage collect select(2) related stuff from upnpevents_processfds().
Rename function to upnpevents_gc(), since the remaining functionality
is garbage collecting, not file descriptor processing.
Actually, this can be simplified even more. We can safely close sockets
and free objects immediately, eliminating need for upnpevents_gc(). But
this change would be beyond scope of this commit.
* upnphttp.c, upnphttp.h
Embed struct event into struct upnphttp. Adjust Process_upnphttp() to match
event_process_t type. Add/del to event dispatcher once creating/closing a
socket.
* minissdp.c, minissdp.h
Make ProcessSSDPRequest() of event_process_t type.
* getifaddr.c, getifaddr.h
Make ProcessMonitorEvent() of event_process_t type.
If an interface comes online after startup, we really need to send a
complete byebye + alive set on that interface, but we don't want to do
it for other interfaces. So do it as the interfaces come up, and
skip it for interfaces that existed before the reload.
* MiniDLNA can now pass the DLNA Conformance Test!
* Dependence on libdlna has been removed, and the ffmpeg libs are used directly.
* Lots of unused code has been cleaned up.
* File transfers will now be forked off into a new process, so as not to tie up the server when sending data.
