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James Tucker af5a845a87 net/dns/resolver: fix dns-sd NXDOMAIN responses from quad-100 ... mdnsResponder at least as of macOS Sequoia does not find NXDOMAIN responses to these dns-sd PTR queries acceptable unless they include the question section in the response. This was found debugging #13511, once we turned on additional diagnostic reporting from mdnsResponder we witnessed: ``` Received unacceptable 12-byte response from 100.100.100.100 over UDP via utun6/27 -- id: 0x7F41 (32577), flags: 0x8183 (R/Query, RD, RA, NXDomain), counts: 0/0/0/0, ``` If the response includes a question section, the resposnes are acceptable, e.g.: ``` Received acceptable 59-byte response from 8.8.8.8 over UDP via en0/17 -- id: 0x2E55 (11861), flags: 0x8183 (R/Query, RD, RA, NXDomain), counts: 1/0/0/0, ``` This may be contributing to an issue under diagnosis in #13511 wherein some combination of conditions results in mdnsResponder no longer answering DNS queries correctly to applications on the system for extended periods of time (multiple minutes), while dig against quad-100 provides correct responses for those same domains. If additional debug logging is enabled in mdnsResponder we see it reporting: ``` Penalizing server 100.100.100.100 for 60 seconds ``` It is also possible that the reason that macOS & iOS never "stopped spamming" these queries is that they have never been replied to with acceptable responses. It is not clear if this special case handling of dns-sd PTR queries was ever beneficial, and given this evidence may have always been harmful. If we subsequently observe that the queries settle down now that they have acceptable responses, we should remove these special cases - making upstream queries very occasionally isn't a lot of battery, so we should be better off having to maintain less special cases and avoid bugs of this class. Updates #2442 Updates #3025 Updates #3363 Updates #3594 Updates #13511 Signed-off-by: James Tucker <james@tailscale.com>		1 month ago
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art	all: fix new lint warnings from bumping staticcheck	2 months ago
captivedetection	net/captivedetection: mark TestAllEndpointsAreUpAndReturnExpectedResponse flaky (#13021)	3 months ago
connstats	all: use Go 1.22 range-over-int	6 months ago
dns	net/dns/resolver: fix dns-sd NXDOMAIN responses from quad-100	1 month ago
dnscache	net/dnscache: use parent context to perform lookup	4 months ago
dnsfallback	{control,net}: close idle connections of custom transports	3 months ago
flowtrack	net/flowtrack: fix, test String method	4 months ago
ipset	go.mod: bump bart	4 months ago
ktimeout	net/ktimeout: add a package to set TCP user timeout	8 months ago
memnet	net/memnet: export the network name (#9111)	1 year ago
netaddr	all: update copyright and license headers	2 years ago
netcheck	net/netcheck,wgengine/magicsock: plumb OnlyTCP443 controlknob through netcheck (#13491)	1 month ago
neterror	net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791)	2 years ago
netkernelconf	ipn/{ipnlocal,localapi},net/netkernelconf,client/tailscale,cmd/containerboot: optionally enable UDP GRO forwarding for containers (#12410)	5 months ago
netknob	all: update copyright and license headers	2 years ago
netmon	all: fix new lint warnings from bumping staticcheck	2 months ago
netns	net/netns: remove some logspam by avoiding logging parse errors due to unspecified addresses	3 months ago
netstat	all: add test for package comments, fix, add comments as needed	4 months ago
netutil	all: add test for package comments, fix, add comments as needed	4 months ago
packet	wgengine/magicsock: actually use AF_PACKET socket for raw disco	2 months ago
ping	net/ping: fix ICMP echo code field to 0	1 year ago
portmapper	all: use math/rand/v2 more	5 months ago
proxymux	all: cleanup unused code, part 1 (#10661)	10 months ago
routetable	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	6 months ago
socks5	net/socks5: support UDP	3 months ago
sockstats	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	6 months ago
speedtest	all: update copyright and license headers	2 years ago
stun	ci: enable checklocks workflow for specific packages	4 months ago
stunserver	all: use Go 1.22 range-over-int	6 months ago
tcpinfo	all: use Go 1.22 range-over-int	6 months ago
tlsdial	cmd/tta, vnet: add host firewall, env var support, more tests	2 months ago
tsaddr	net/ipset, wgengine/filter/filtertype: add split-out packages	4 months ago
tsdial	{control,net}: close idle connections of custom transports	3 months ago
tshttpproxy	all: use Go 1.22 range-over-int	6 months ago
tstun	net/tstun: probe TCP GRO (#13376)	2 months ago
wsconn	go.{mod,sum}: migrate from nhooyr.io/websocket to github.com/coder/websocket	2 months ago