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Nick Hill 17335d2104 net/dns/resolver: forward SERVFAIL responses over PeerDNS ... As per the docstring, (*forwarder).forwardWithDestChan should either send to responseChan and returns nil, or returns a non-nil error (without sending to the channel). However, this does not hold when all upstream DNS servers replied with an error. We've been handling this special error path in (*Resolver).Query but not in (*Resolver).HandlePeerDNSQuery. As a result, SERVFAIL responses from upstream servers were being converted into HTTP 503 responses, instead of being properly forwarded as SERVFAIL within a successful HTTP response, as per RFC 8484, section 4.2.1: A successful HTTP response with a 2xx status code (see Section 6.3 of [RFC7231]) is used for any valid DNS response, regardless of the DNS response code. For example, a successful 2xx HTTP status code is used even with a DNS message whose DNS response code indicates failure, such as SERVFAIL or NXDOMAIN. In this PR we fix (*forwarder).forwardWithDestChan to no longer return an error when it sends a response to responseChan, and remove the special handling in (*Resolver).Query, as it is no longer necessary. Updates #13571 Signed-off-by: Nick Hill <mykola.khyl@gmail.com>		3 weeks ago
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publicdns	net/dns/publicdns: remove additional information in DOH URL passed to IPv6 address generation for controlD.	4 months ago
recursive	all: use Go 1.22 range-over-int	7 months ago
resolvconffile	clientupdate, net/dns: fix some "tailsacle" typos	7 months ago
resolver	net/dns/resolver: forward SERVFAIL responses over PeerDNS	3 weeks ago
config.go	all: add test for package comments, fix, add comments as needed	4 months ago
debian_resolvconf.go	all: update copyright and license headers	2 years ago
direct.go	net/dns: ensure /etc/resolv.conf is world-readable even with a umask	4 months ago
direct_linux.go	net/dns: updated gonotify dependency to v2 that supports closable context	2 months ago
direct_notlinux.go	all: update copyright and license headers	2 years ago
direct_test.go	clientupdate, net/dns: fix some "tailsacle" typos	7 months ago
direct_unix_test.go	net/dns: ensure /etc/resolv.conf is world-readable even with a umask	4 months ago
flush_default.go	all: update copyright and license headers	2 years ago
flush_windows.go	cmd/tailscaled, net/dns, wgengine/router: start Windows child processes with DETACHED_PROCESS when I/O is being piped	5 months ago
ini.go	all: update copyright and license headers	2 years ago
ini_test.go	all: update copyright and license headers	2 years ago
manager.go	cli: implement `tailscale dns status` (#13353)	2 months ago
manager_darwin.go	net/dns: support GetBaseConfig on Darwin OSS tailscaled (#13351)	2 months ago
manager_default.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	5 months ago
manager_freebsd.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	5 months ago
manager_linux.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	5 months ago
manager_linux_test.go	net/dns: ensure /etc/resolv.conf is world-readable even with a umask	4 months ago
manager_openbsd.go	various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows	5 months ago
manager_tcp_test.go	net/dns, health: raise health warning for failing forwarded DNS queries (#12888)	3 months ago
manager_test.go	net/dns: ensure multiple hosts with the same IP address are combined into a single HostEntry	4 months ago
manager_windows.go	net/dns: disable DNS registration for Tailscale interface on Windows	2 months ago
manager_windows_test.go	util/winutil/gp, net/dns: add package for Group Policy API	4 months ago
nm.go	all: cleanup unused code, part 2 (#10670)	11 months ago
noop.go	all: update copyright and license headers	2 years ago
nrpt_windows.go	util/winutil/gp, net/dns: add package for Group Policy API	4 months ago
openresolv.go	net/dns: log more info when openresolv commands fail	9 months ago
osconfig.go	net/dns: fix IsZero and Equal methods on OSConfig	2 months ago
osconfig_test.go	net/dns: fix IsZero and Equal methods on OSConfig	2 months ago
resolvconf-workaround.sh	all: update copyright and license headers	2 years ago
resolvconf.go	net/dns: properly detect newer debian resolvconf	1 year ago
resolvconfpath_default.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	1 year ago
resolvconfpath_gokrazy.go	net/dns: overwrite /tmp/resolv.conf on gokrazy	1 year ago
resolvd.go	all: update copyright and license headers	2 years ago
resolved.go	health, all: remove health.Global, finish plumbing health.Tracker	6 months ago
utf.go	all: update copyright and license headers	2 years ago
utf_test.go	all: update copyright and license headers	2 years ago
wsl_windows.go	net/dns: ensure /etc/resolv.conf is world-readable even with a umask	4 months ago