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tailscale/net
Jonathan Nobels 02e3c046aa
net/dns: re-query system resolvers on no-upstream resolver failure on apple platforms (#12398)
Fixes tailscale/corp#20677

On macOS sleep/wake, we're encountering a condition where reconfigure the network
a little bit too quickly - before apple has set the nameservers for our interface.
This results in a persistent condition where we have no upstream resolver and
fail all forwarded DNS queries.

No upstream nameservers is a legitimate configuration, and we have no  (good) way
of determining when Apple is ready - but if we need to forward a query, and we
have no nameservers, then something has gone badly wrong and the network is
very broken.

A simple fix here is to simply inject a netMon event, which will go through the
configuration dance again when we hit the SERVFAIL condition.

Tested by artificially/randomly returning [] for the list of nameservers in the bespoke
ipn-bridge code responsible for getting the nameservers.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>
3 weeks ago
..
art all: use Go 1.22 range-over-int 3 months ago
connstats all: use Go 1.22 range-over-int 3 months ago
dns net/dns: re-query system resolvers on no-upstream resolver failure on apple platforms (#12398) 3 weeks ago
dnscache net/dnscache: use parent context to perform lookup 3 weeks ago
dnsfallback tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing 2 months ago
flowtrack all: update copyright and license headers 1 year ago
ktimeout net/ktimeout: add a package to set TCP user timeout 4 months ago
memnet net/memnet: export the network name (#9111) 10 months ago
netaddr all: update copyright and license headers 1 year ago
netcheck net/netcheck: fix probeProto.String result for IPv6 probes 4 weeks ago
neterror net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791) 1 year ago
netkernelconf ipn/{ipnlocal,localapi},net/netkernelconf,client/tailscale,cmd/containerboot: optionally enable UDP GRO forwarding for containers (#12410) 3 weeks ago
netknob all: update copyright and license headers 1 year ago
netmon net/netmon: remove spammy log statements (#11953) 2 months ago
netns net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon 2 months ago
netstat net/{netns,netstat}: use new x/sys/cpu.IsBigEndian 1 year ago
netutil net/netmon, add: add netmon.State type alias of interfaces.State 2 months ago
packet all: use Go 1.22 range-over-int 3 months ago
ping net/ping: fix ICMP echo code field to 0 10 months ago
portmapper all: use math/rand/v2 more 4 weeks ago
proxymux all: cleanup unused code, part 1 (#10661) 6 months ago
routetable net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon 2 months ago
socks5 net/socks5: add password auth support 1 year ago
sockstats net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon 2 months ago
speedtest all: update copyright and license headers 1 year ago
stun all: make more tests pass/skip in airplane mode 2 months ago
stunserver all: use Go 1.22 range-over-int 3 months ago
tcpinfo all: use Go 1.22 range-over-int 3 months ago
tlsdial tsd, ipnlocal, etc: add tsd.System.HealthTracker, start some plumbing 2 months ago
tsaddr types/views: remove duplicate SliceContainsFunc 2 months ago
tsdial tsnet,wgengine/netstack: add ListenPacket and tests 4 weeks ago
tshttpproxy all: use Go 1.22 range-over-int 3 months ago
tstun net/tstun: do SNAT after filterPacketOutboundToWireGuard 2 months ago
wsconn net/wsconn: accept a remote addr string and plumb it through 10 months ago