This removes the need for go-cmp, which is extremely bloaty so we had
to leave it out of iOS. As a result, we had also left it out of macOS,
and so we didn't print netmap diffs at all on darwin-based platforms.
Oops.
As a bonus, the output format of the new function is way better.
Minor oddity: because I used the dumbest possible diff algorithm, the
sort order is a bit dumb. We print all "removed" lines and then print
all "added" lines, rather than doing the usual diff-like thing of
interspersing them. This probably doesn't matter (maybe it's an
improvement).
The .Concise() view had grown hard to read over time. Originally, we
assumed a peer almost always had just one endpoint and one-or-more
allowedips. With magicsock, we now almost always have multiple
endpoints per peer. And empirically, almost every peer has only one
allowedip.
Change their order so we can line up allowedips vertically. Also do
some tweaking to make multiple endpoints easier to read.
While we're here, add a column to show the home DERP server of each
peer, if any.
We log it once upon receiving the first copy of the map, then
subsequently when a new one appears, but only if we haven't logged one
less than 5 minutes ago.
This avoids overly cluttering the log (as we did before, logging the
netmap every time one appeared, which could be hundreds of lines every
few seconds), but still gives the log enough context to help in
diagnosing problems retroactively.
* 'master' of github.com:tailscale/tailscale:
netcheck: fix data races for staggler STUN packets arriving after GetReport
wgengine/magicsock: add a pointer value for logging
netcheck: ignore IPv4 STUN failures if we saw at least one reply
netcheck: ignore IPv6 STUN failures
derp: add clients_replaced counter
version: bump OSS version datestamp.
relaynode itself is not long for this world, deprecated in favour of
tailscale/tailscaled. But now that the control server supports central
distribution of packet filters, let's actually take advantage of it in
a final, backward compatible release of relaynode.
Avery Pennarun