tailscale

Commit Graph

Author	SHA1	Message	Date
Andrew Dunham	880a41bfcc	net/dns/resolver: add envknob to debug exit node DNS queries on on Windows Add the envknob TS_DEBUG_EXIT_NODE_DNS_NET_PKG, which enables more verbose debug logging when calling the handleExitNodeDNSQueryWithNetPkg function. This function is currently only called on Windows and Android. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ieb3ca7b98837d7dc69cd9ca47609c1c52e3afd7b	2 years ago
Brad Fitzpatrick	b1248442c3	all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork Updates #7123 Updates #5309 Change-Id: I90bcd87a2fb85a91834a0dd4be6e03db08438672 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Will Norris	71029cea2d	all: update copyright and license headers This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>	2 years ago
Brad Fitzpatrick	3addcacfe9	net/dns: fix recently added URL scheme from http to https I typoed/brainoed in the earlier `3582628691` Change-Id: Ic198a6f9911f195d9da9fc5259b5784a4b15e5e3 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	3582628691	net/dns/resolvconffile: link to FAQ about resolv.conf being overwritten Add link to new http://tailscale.com/s/resolvconf-overwrite page, added in tailscale/tailscale-www#2243 Change-Id: I9718399487f2ed18bf1a112581fd168aea30f232 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Tom DNetto	673b3d8dbd	net/dns,userspace: remove unused DNS paths, normalize query limit on iOS With `a42a594bb3`, iOS uses netstack and hence there are no longer any platforms which use the legacy MagicDNS path. As such, we remove it. We also normalize the limit for max in-flight DNS queries on iOS (it was 64, now its 256 as per other platforms). It was 64 for the sake of being cautious about memory, but now we have 50Mb (iOS-15 and greater) instead of 15Mb so we have the spare headroom. Signed-off-by: Tom DNetto <tom@tailscale.com>	2 years ago
Brad Fitzpatrick	ea70aa3d98	net/dns/resolvconffile: fix handling of multiple search domains Fixes #6875 Change-Id: I57eb9312c9a1c81792ce2b5a0a0f254213b05df2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Andrew Dunham	0372e14d79	net/dns: bump DNS-over-TCP size limit to 4k We saw a few cases where we hit this limit; bumping to 4k seems relatively uncontroversial. Change-Id: I218fee3bc0d2fa5fde16eddc36497a73ebd7cbda Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
Andrew Dunham	3f4d51c588	net/dns: don't send on closed channel when message too large Previously, if a DNS-over-TCP message was received while there were existing queries in-flight, and it was over the size limit, we'd close the 'responses' channel. This would cause those in-flight queries to send on the closed channel and panic. Instead, don't close the channel at all and rely on s.ctx being canceled, which will ensure that in-flight queries don't hang. Fixes #6725 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I8267728ac37ed7ae38ddd09ce2633a5824320097	2 years ago
Brad Fitzpatrick	ca08e316af	util/endian: delete package; use updated josharian/native instead See josharian/native#3 Updates golang/go#57237 Change-Id: I238c04c6654e5b9e7d9cfb81a7bbc5e1043a84a2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	99aa335923	net/dns: [linux] log and add metric for dnsMode I couldn't find any logs that indicated which mode it was running in so adding that. Also added a gauge metric for dnsMode. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Andrew Dunham	ec790e58df	net/dns: retry overwriting hosts file on Windows Updates #5753 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I60f81bd3325d5ba5383b947c7a7aaa5b14e460f6	2 years ago
Mihai Parparita	33520920c3	all: use strs.CutPrefix and strs.CutSuffix more Updates places where we use HasPrefix + TrimPrefix to use the combined function. Updates #5309 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Aaron Klotz	41e1d336cc	net/dns: change windows DNS manager to use pointer receiver This is safer given that we need to close the NRPT database. Signed-off-by: Aaron Klotz <aaron@tailscale.com>	2 years ago
Brad Fitzpatrick	90bd74fc05	net/dns: add a health warning when Linux /etc/resolv.conf is overwritten Change-Id: I925b4d904bc7ed920bc5afee11e6dcb2ffc2fbfd Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	001f482aca	net/dns: make "direct" mode on Linux warn on resolv.conf fights Run an inotify goroutine and watch if another program takes over /etc/inotify.conf. Log if so. For now this only logs. In the future I want to wire it up into the health system to warn (visible in "tailscale status", etc) about the situation, with a short URL to more info about how you should really be using systemd-resolved if you want programs to not fight over your DNS files on Linux. Updates #4254 etc etc Change-Id: I86ad9125717d266d0e3822d4d847d88da6a0daaa Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	66b4a363bd	net/dns/resolver: add yet another 4via6 DNS form that's hopefully more robust $ dig +short @100.100.100.100 aaaa 10-2-5-3-via-7.foo-bar.ts.net fd7a:115c:a1e0:b1a:0:7:a02:503 $ dig +short @100.100.100.100 aaaa 10-2-5-3-via-7 fd7a:115c:a1e0:b1a:0:7:a02:503 $ ping 10-2-5-3-via-7 PING 10-2-5-3-via-7(fd7a:115c:a1e0:b1a:0:7:a02:503 (fd7a:115c:a1e0:b1a:0:7:a02:503)) 56 data bytes ... Change-Id: Ice8f954518a6a2fca8b2c04da7f31f61d78cdec4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	da8def8e13	all: remove old +build tags The //go:build syntax was introduced in Go 1.17: https://go.dev/doc/go1.17#build-lines gofmt has kept the +build and go:build lines in sync since then, but enough time has passed. Time to remove them. Done with: perl -i -npe 's,^// \+build.*\n,,' $(git grep -l -F '+build') Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Anton Tolchanov	e25ab75795	net/dns: getting base DNS config is not supported on macOS Instead of returning a custom error, use ErrGetBaseConfigNotSupported that seems to be intended for this use case. This fixes DNS resolution on macOS clients compiled from source. Signed-off-by: Anton Tolchanov <anton@tailscale.com>	2 years ago
Andrew Dunham	e966f024b0	net/dns: print systemd-resolved ResolvConfMode The ResolvConfMode property is documented to return how systemd-resolved is currently managing /etc/resolv.conf. Include that information in the debug line, when available, to assist in debugging DNS issues. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I1ae3a257df1d318d0193a8c7f135c458ec45093e	2 years ago
Maisem Ali	3555a49518	net/dns: always attempt to read the OS config on macOS/iOS Also reconfigure DNS on iOS/macOS on link changes. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Mihai Parparita	8343b243e7	all: consistently initialize Logf when creating tsdial.Dialers Most visible when using tsnet.Server, but could have resulted in dropped messages in a few other places too. Fixes #5743 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Josh Soref	d4811f11a0	all: fix spelling mistakes Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>	2 years ago
Brad Fitzpatrick	bb7be74756	net/dns/publicdns: permit more NextDNS profile bits in its IPv6 suffix I brain-o'ed the math earlier. The NextDNS prefix is /32 (actually /33, but will guarantee last bit is 0), so we have 128-32 = 96 bits (12 bytes) of config/profile ID that we can extract. NextDNS doesn't currently use all those, but might. Updates #2452 Change-Id: I249bd28500c781e45425fd00fd3f46893ae226a2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Andrew Dunham	a5fab23e8f	net/dns: format OSConfig correctly with no pointers (#5766 ) Fixes tailscale/tailscale#5669 Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
Eng Zer Jun	f0347e841f	refactor: move from io/ioutil to io and os packages The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. Reference: https://golang.org/doc/go1.16#ioutil Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>	2 years ago
Brad Fitzpatrick	74674b110d	envknob: support changing envknobs post-init Updates #5114 Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Mihai Parparita	82e82d9b7a	net/dns/resolver: remove unused responseTimeout constant Timeout is now enforced elsewhere, see discussion in https://github.com/tailscale/tailscale/pull/4408#discussion_r970092333. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
nyghtowl	0f16640546	net/dns: fix fmt error on Revert print Fixes #5619 Signed-off-by: nyghtowl <warrick@tailscale.com>	2 years ago
Brad Fitzpatrick	708b7bff3d	net/dns/publicdns: also support NextDNS DoH query parameters The plan has changed. Doing query parameters rather than path + heades. NextDNS added support for query parameters. Updates #2452 Change-Id: I4783c0a06d6af90756d9c80a7512644ba702388c Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	e7376aca25	net/dns/resolver: set DNS-over-HTTPS Accept and User-Agent header on requests Change-Id: I14b821771681e70405a507f43229c694159265ff Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	c14361e70e	net/dns/publicdns: support NextDNS DoH URLs with path parameters Updates #2452 Change-Id: I0f1c34cc1672e87e7efd0adfe4088724dd0de3ed Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	2aade349fc	net/dns, types/dnstypes: update some comments, tests for DoH Clarify & verify that some DoH URLs can be sent over tailcfg in some limited cases. Updates #2452 Change-Id: Ibb25db77788629c315dc26285a1059a763989e24 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	58abae1f83	net/dns/{publicdns,resolver}: add NextDNS DoH support NextDNS is unique in that users create accounts and then get user-specific DNS IPs & DoH URLs. For DoH, the customer ID is in the URL path. For IPv6, the IP address includes the customer ID in the lower bits. For IPv4, there's a fragile "IP linking" mechanism to associate your public IPv4 with an assigned NextDNS IPv4 and that tuple maps to your customer ID. We don't use the IP linking mechanism. Instead, NextDNS is DoH-only. Which means using NextDNS necessarily shunts all DNS traffic through 100.100.100.100 (programming the OS to use 100.100.100.100 as the global resolver) because operating systems can't usually do DoH themselves. Once it's in Tailscale's DoH client, we then connect out to the known NextDNS IPv4/IPv6 anycast addresses. If the control plane sends the client a NextDNS IPv6 address, we then map it to the corresponding NextDNS DoH with the same client ID, and we dial that DoH server using the combination of v4/v6 anycast IPs. Updates #2452 Change-Id: I3439d798d21d5fc9df5a2701839910f5bef85463 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	9bd9f37d29	go.mod: bump wireguard/windows, which moves to using net/netip Updates #5162 Change-Id: If99a3f0000bce0c01bdf44da1d513f236fd7cdf8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	9f6c8517e0	net/dns: set OS DNS to 100.100.100.100 for route-less ExtraRecords [cap 41] If ExtraRecords (Hosts) are specified without a corresponding split DNS route and global DNS is specified, then program the host OS DNS to use 100.100.100.100 so it can blend in those ExtraRecords. Updates #1543 Change-Id: If49014a5ecc8e38978ff26e54d1f74fe8dbbb9bc Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	68d9d161f4	net/dns: [win] fix regression in disableDynamicUpdate Somehow I accidentally set the wrong registry value here. It should be DisableDynamicUpdate=1 and not EnableDNSUpdate=0. This is a regression from `545639e`. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Nahum Shalman	214242ff62	net/dns/publicdns: Add Mullvad DoH See https://mullvad.net/en/help/dns-over-https-and-dns-over-tls/ The Mullvad DoH servers appear to only speak HTTP/2 and the use of a non-nil DialContext in the http.Transport means that ForceAttemptHTTP2 must be set to true to be able to use them. Signed-off-by: Nahum Shalman <nahamu@gmail.com>	2 years ago
Maisem Ali	9197dd14cc	net/dns: [win] add MagicDNS entries to etc/hosts This works around the 2.3s delay in short name lookups when SNR is enabled. C:\Windows\System32\drivers\etc\hosts file. We only add known hosts that match the search domains, and we populate the list in order of Search Domains so that our matching algorithm mimics what Windows would otherwise do itself if SNR was off. Updates #1659 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	25865f81ee	net/dns: disable NetBIOS on Tailscale interfaces Like LLMNR, NetBIOS also adds resolution delays and we don't support it anyway so just disable it on the interface. Updates #1659 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	545639ee44	util/winutil: consolidate interface specific registry keys Code movement to allow reuse in a follow up PR. Updates #1659 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	1cff719015	net/dns: [win] respond with SERVFAIL queries when no resolvers Currently we forward unmatched queries to the default resolver on Windows. This results in duplicate queries being issued to the same resolver which is just wasted. Updates #1659 Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	3bb57504af	net/dns/resolver: add comments clarifying nil error returns Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	4497bb0b81	net/dns/resolver: return SERVFAIL when no upstream resolvers set Otherwise we just keep looping over the same thing again and again. ``` dns udp query: upstream nameservers not set dns udp query: upstream nameservers not set dns udp query: upstream nameservers not set ``` Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	a9f6cd41fd	all: use syncs.AtomicValue Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Maisem Ali	9bb5a038e5	all: use atomic.Pointer Also add some missing docs. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	8725b14056	all: migrate more code code to net/netip directly Instead of going through the tailscale.com/net/netaddr transitional wrappers. Updates #5162 Change-Id: I3dafd1c2effa1a6caa9b7151ecf6edd1a3fda3dd Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	116f55ff66	all: gofmt for Go 1.19 Updates #5210 Change-Id: Ib02cd5e43d0a8db60c1f09755a8ac7b140b670be Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
nyghtowl	e6e1976c3a	net/dns: remove systemd-resolved ping Ping only needed to ensure system awak otherwise utilizing resolvConf to set dns mode. Signed-off-by: nyghtowl <warrick@tailscale.com>	2 years ago
Brad Fitzpatrick	a12aad6b47	all: convert more code to use net/netip directly perl -i -npe 's,netaddr.IPPrefixFrom,netip.PrefixFrom,' $(git grep -l -F netaddr.) perl -i -npe 's,netaddr.IPPortFrom,netip.AddrPortFrom,' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPPrefix,netip.Prefix,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPPort,netip.AddrPort,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IP\b,netip.Addr,g' $(git grep -l -F netaddr. ) perl -i -npe 's,netaddr.IPv6Raw\b,netip.AddrFrom16,g' $(git grep -l -F netaddr. ) goimports -w . Then delete some stuff from the net/netaddr shim package which is no longer neeed. Updates #5162 Change-Id: Ia7a86893fe21c7e3ee1ec823e8aba288d4566cd8 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago

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286 Commits (8cf2805ccad7cfa685030dc98475badf4e98eb88)