- chptr->creationtime != MAGIC_REMOTE_JOIN_TS)) {
- modebuf_init(&mbuf, sptr, cptr, chptr,
- (MODEBUF_DEST_SERVER | /* Send mode to server */
- MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
- MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
-
- modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr);
-
- modebuf_flush(&mbuf);
-
- badop = 1;
+ /* Accept CREATE for zannels. This is only really necessary on a network
+ with servers prior to 2.10.12.02: we just accept their TS and ignore
+ the fact that it was a zannel. The influence of this on a network
+ that is completely 2.10.12.03 or higher is neglectable: Normally
+ a server only sends a CREATE after first sending a DESTRUCT. Thus,
+ by receiving a CREATE for a zannel one of three things happened:
+ 1. The DESTRUCT was sent during a net.break; this could mean that
+ our zannel is at the verge of expiring too, it should have been
+ destructed. It is correct to copy the newer TS now, all modes
+ already have been reset, so it will be as if it was destructed
+ and immediately recreated. In order to avoid desyncs of modes,
+ we don't accept a CREATE for channels that have +A set.
+ 2. The DESTRUCT passed, then someone created the channel on our
+ side and left it again. In this situation we have a near
+ simultaneous creation on two servers; the person on our side
+ already left within the time span of a message propagation.
+ The channel will therefore be less than 48 hours old and no
+ 'protection' is necessary.
+ 3. The source server sent the CREATE while linking,
+ before it got the BURST for our zannel. If this
+ happens, we should reset the channel back to the old
+ timestamp. This can be distinguished from case #1 by
+ checking IsBurstOrBurstAck(cli_user(sptr)->server).
+ */
+ !(chptr->users == 0 && !chptr->mode.apass[0]))) {
+ if (!IsBurstOrBurstAck(cli_user(sptr)->server)) {
+ modebuf_init(&mbuf, sptr, cptr, chptr,
+ (MODEBUF_DEST_SERVER | /* Send mode to server */
+ MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
+ MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
+
+ modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
+
+ modebuf_flush(&mbuf);
+
+ badop = 1;
+ } else if (chanTS > chptr->creationtime + 4) {
+ /* If their handling of the BURST will lead to deopping the
+ * user, have the user join without getting ops (if the
+ * server's handling of the BURST keeps their ops, the channel
+ * will use our timestamp).
+ */
+ badop = 1;
+ }
+
+ if (badop)
+ joinbuf_join(&join, chptr, 0);