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2026-01-23all: remove AUTHORS file and references to itWill Norris22-22/+22
This file was never truly necessary and has never actually been used in the history of Tailscale's open source releases. A Brief History of AUTHORS files --- The AUTHORS file was a pattern developed at Google, originally for Chromium, then adopted by Go and a bunch of other projects. The problem was that Chromium originally had a copyright line only recognizing Google as the copyright holder. Because Google (and most open source projects) do not require copyright assignemnt for contributions, each contributor maintains their copyright. Some large corporate contributors then tried to add their own name to the copyright line in the LICENSE file or in file headers. This quickly becomes unwieldy, and puts a tremendous burden on anyone building on top of Chromium, since the license requires that they keep all copyright lines intact. The compromise was to create an AUTHORS file that would list all of the copyright holders. The LICENSE file and source file headers would then include that list by reference, listing the copyright holder as "The Chromium Authors". This also become cumbersome to simply keep the file up to date with a high rate of new contributors. Plus it's not always obvious who the copyright holder is. Sometimes it is the individual making the contribution, but many times it may be their employer. There is no way for the proejct maintainer to know. Eventually, Google changed their policy to no longer recommend trying to keep the AUTHORS file up to date proactively, and instead to only add to it when requested: https://opensource.google/docs/releasing/authors. They are also clear that: > Adding contributors to the AUTHORS file is entirely within the > project's discretion and has no implications for copyright ownership. It was primarily added to appease a small number of large contributors that insisted that they be recognized as copyright holders (which was entirely their right to do). But it's not truly necessary, and not even the most accurate way of identifying contributors and/or copyright holders. In practice, we've never added anyone to our AUTHORS file. It only lists Tailscale, so it's not really serving any purpose. It also causes confusion because Tailscalars put the "Tailscale Inc & AUTHORS" header in other open source repos which don't actually have an AUTHORS file, so it's ambiguous what that means. Instead, we just acknowledge that the contributors to Tailscale (whoever they are) are copyright holders for their individual contributions. We also have the benefit of using the DCO (developercertificate.org) which provides some additional certification of their right to make the contribution. The source file changes were purely mechanical with: git ls-files | xargs sed -i -e 's/\(Tailscale Inc &\) AUTHORS/\1 contributors/g' Updates #cleanup Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d Signed-off-by: Will Norris <will@tailscale.com>
2026-01-19net/udprelay: advertise addresses from cloud metadata service (#18368)Alex Valiushko1-1/+1
Polls IMDS (currently only AWS) for extra IPs to advertise as udprelay. Updates #17796 Change-Id: Iaaa899ef4575dc23b09a5b713ce6693f6a6a6964 Signed-off-by: Alex Valiushko <alexvaliushko@tailscale.com>
2026-01-16net/netmon: move TailscaleInterfaceIndex out of netmon.State (#18428)Jonathan Nobels1-1/+2
fixes tailscale/tailscale#18418 Both Serve and PeerAPI broke when we moved the TailscaleInterfaceName into State, which is updated asynchronously and may not be available when we configure the listeners. This extracts the explicit interface name property from netmon.State and adds as a static struct with getters that have proper error handling. The bug is only found in sandboxed Darwin clients, where we need to know the Tailscale interface details in order to set up the listeners correctly (they must bind to our interface explicitly to escape the network sandboxing that is applied by NECP). Currently set only sandboxed macOS and Plan9 set this but it will also be useful on Windows to simplify interface filtering in netns. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>
2026-01-14cmd,feature: add identity token auto generation for workload identity (#18373)Danni Popova1-0/+1
Adds the ability to detect what provider the client is running on and tries fetch the ID token to use with Workload Identity. Updates https://github.com/tailscale/corp/issues/33316 Signed-off-by: Danni Popova <danni@tailscale.com>
2026-01-08feature/featuretags: make QR codes modular (#18358)Simon Law1-11/+2
QR codes are used by `tailscale up --qr` to provide an easy way to open a web-page without transcribing a difficult URI. However, there’s no need for this feature if the client will never be called interactively. So this PR adds the `ts_omit_qrcodes` build tag. Updates #18182 Signed-off-by: Simon Law <sfllaw@tailscale.com>
2026-01-08net/portmapper, go.mod: unfork our goupnp dependencyAndrew Dunham1-6/+6
Updates #7436 Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2026-01-07cmd/tailscale/cli, util/qrcodes: format QR codes on Linux consoles (#18182)Simon Law1-1/+2
Raw Linux consoles support UTF-8, but we cannot assume that all UTF-8 characters are available. The default Fixed and Terminus fonts don’t contain half-block characters (`▀` and `▄`), but do contain the full-block character (`█`). Sometimes, Linux doesn’t have a framebuffer, so it falls back to VGA. When this happens, the full-block character could be anywhere in extended ASCII block, because we don’t know which code page is active. This PR introduces `--qr-format=auto` which tries to heuristically detect when Tailscale is printing to a raw Linux console, whether UTF-8 is enabled, and which block characters have been mapped in the console font. If Unicode characters are unavailable, the new `--qr-format=ascii` formatter uses `#` characters instead of full-block characters. Fixes #12935 Signed-off-by: Simon Law <sfllaw@tailscale.com>
2026-01-06wgengine/magicsock: extract IMDS utilities into a standalone package (#18334)Alex Valiushko3-0/+3
Moves magicksock.cloudInfo into util/cloudinfo with minimal changes. Updates #17796 Change-Id: I83f32473b9180074d5cdbf00fa31e5b3f579f189 Signed-off-by: Alex Valiushko <alexvaliushko@tailscale.com>
2026-01-06cmd/tailscaled,ipn/{ipnlocal,store/kubestore}: don't create attestation keys ↵Irbe Krumina2-4/+98
for stores that are not bound to a node (#18322) Ensure that hardware attestation keys are not added to tailscaled state stores that are Kubernetes Secrets or AWS SSM as those Tailscale devices should be able to be recreated on different nodes, for example, when moving Pods between nodes. Updates tailscale/tailscale#18302 Signed-off-by: Irbe Krumina <irbekrm@gmail.com>
2026-01-05cmd/tailscaled: disable state encryption / attestation by default (#18336)Andrew Lytvynov1-14/+4
TPM-based features have been incredibly painful due to the heterogeneous devices in the wild, and many situations in which the TPM "changes" (is reset or replaced). All of this leads to a lot of customer issues. We hoped to iron out all the kinks and get all users to benefit from state encryption and hardware attestation without manually opting in, but the long tail of kinks is just too long. This change disables TPM-based features on Windows and Linux by default. Node state should get auto-decrypted on update, and old attestation keys will be removed. There's also tailscaled-on-macOS, but it won't have a TPM or Keychain bindings anyway. Updates #18302 Updates #15830 Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
2025-12-17net/netmon, wgengine/userspace: purge ChangeDelta.Major and address TODOs ↵Jonathan Nobels1-3/+3
(#17823) updates tailscale/corp#33891 Addresses several older the TODO's in netmon. This removes the Major flag precomputes the ChangeDelta state, rather than making consumers of ChangeDeltas sort that out themselves. We're also seeing a lot of ChangeDelta's being flagged as "Major" when they are not interesting, triggering rebinds in wgengine that are not needed. This cleans that up and adds a host of additional tests. The dependencies are cleaned, notably removing dependency on netmon itself for calculating what is interesting, and what is not. This includes letting individual platforms set a bespoke global "IsInterestingInterface" function. This is only used on Darwin. RebindRequired now roughly follows how "Major" was historically calculated but includes some additional checks for various uninteresting events such as changes in interface addresses that shouldn't trigger a rebind. This significantly reduces thrashing (by roughly half on Darwin clients which switching between nics). The individual values that we roll into RebindRequired are also exposed so that components consuming netmap.ChangeDelta can ask more targeted questions. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>
2025-12-09net/dns: retrample resolve.conf when another process has trampled it (#18069)Claus Lensbøl1-2/+2
When using the resolve.conf file for setting DNS, it is possible that some other services will trample the file and overwrite our set DNS server. Experiments has shown this to be a racy error depending on how quickly processes start. Make an attempt to trample back the file a limited number of times if the file is changed. Updates #16635 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
2025-12-09appc,feature: add the start of new conn25 app connectorFran Bull3-5/+8
When peers request an IP address mapping to be stored, the connector stores it in memory. Fixes tailscale/corp#34251 Signed-off-by: Fran Bull <fran@tailscale.com>
2025-12-04cmd/tailscale,ipn: add Unix socket support for servePeter A.1-0/+1
Based on PR #16700 by @lox, adapted to current codebase. Adds support for proxying HTTP requests to Unix domain sockets via tailscale serve unix:/path/to/socket, enabling exposure of services like Docker, containerd, PHP-FPM over Tailscale without TCP bridging. The implementation includes reasonable protections against exposure of tailscaled's own socket. Adaptations from original PR: - Use net.Dialer.DialContext instead of net.Dial for context propagation - Use http.Transport with Protocols API (current h2c approach, not http2.Transport) - Resolve conflicts with hasScheme variable in ExpandProxyTargetValue Updates #9771 Signed-off-by: Peter A. <ink.splatters@pm.me> Co-authored-by: Lachlan Donald <lachlan@ljd.cc>
2025-11-24cmd/cigocacher,go.mod: add cigocacher cmdTom Proctor3-0/+3
Adds cmd/cigocacher as the client to cigocached for Go caching over HTTP. The HTTP cache is best-effort only, and builds will fall back to disk-only cache if it's not available, much like regular builds. Not yet used in CI; that will follow in another PR once we have runners available in this repo with the right network setup for reaching cigocached. Updates tailscale/corp#10808 Change-Id: I13ae1a12450eb2a05bd9843f358474243989e967 Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
2025-11-20cmd/tailscaled,ipn: show a health warning when state store fails to open ↵Andrew Lytvynov4-3/+64
(#17883) With the introduction of node sealing, store.New fails in some cases due to the TPM device being reset or unavailable. Currently it results in tailscaled crashing at startup, which is not obvious to the user until they check the logs. Instead of crashing tailscaled at startup, start with an in-memory store with a health warning about state initialization and a link to (future) docs on what to do. When this health message is set, also block any login attempts to avoid masking the problem with an ephemeral node registration. Updates #15830 Updates #17654 Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
2025-11-17go.mod: bump golang.org/x/crypto (#17907)Andrew Lytvynov1-1/+1
Pick up a fix for https://pkg.go.dev/vuln/GO-2025-4116 (even though we're not affected). Updates #cleanup Change-Id: I9f2571b17c1f14db58ece8a5a34785805217d9dd Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
2025-11-16ipn/ipnlocal: add PROXY protocol support to Funnel/ServeAndrew Dunham1-0/+1
This adds the --proxy-protocol flag to 'tailscale serve' and 'tailscale funnel', which tells the Tailscale client to prepend a PROXY protocol[1] header when making connections to the proxied-to backend. I've verified that this works with our existing funnel servers without additional work, since they pass along source address information via PeerAPI already. Updates #7747 [1]: https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt Change-Id: I647c24d319375c1b33e995555a541b7615d2d203 Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
2025-11-11util/eventbus: log goroutine stacks when hung in CIBrad Fitzpatrick3-3/+3
Updates #17680 Change-Id: Ie48dc2d64b7583d68578a28af52f6926f903ca4f Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-11-04wgengine/netlog: include node OS in logged attributes (#17755)Joe Tsai1-0/+1
Include the node's OS with network flow log information. Refactor the JSON-length computation to be a bit more precise. Updates tailscale/corp#33352 Fixes tailscale/corp#34030 Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2025-10-30logtail: avoid racing eventbus subscriptions with shutdown (#17695)M. J. Fromberger1-0/+1
In #17639 we moved the subscription into NewLogger to ensure we would not race subscribing with shutdown of the eventbus client. Doing so fixed that problem, but exposed another: As we were only servicing events occasionally when waiting for the network to come up, we could leave the eventbus to stall in cases where a number of network deltas arrived later and weren't processed. To address that, let's separate the concerns: As before, we'll Subscribe early to avoid conflicts with shutdown; but instead of using the subscriber directly to determine readiness, we'll keep track of the last-known network state in a selectable condition that the subscriber updates for us. When we want to wait, we'll wait on that condition (or until our context ends), ensuring all the events get processed in a timely manner. Updates #17638 Updates #15160 Change-Id: I28339a372be4ab24be46e2834a218874c33a0d2d Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>
2025-10-24health: compare warnable codes to avoid errors on release branch (#17637)Claus Lensbøl1-1/+1
This compares the warnings we actually care about and skips the unstable warnings and the changes with no warnings. Fixes #17635 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
2025-10-17cmd/tailscale/cli,feature: add support for identity federation (#17529)Max Coulombe2-3/+4
Add new arguments to `tailscale up` so authkeys can be generated dynamically via identity federation. Updates #9192 Signed-off-by: mcoulombe <max@tailscale.com>
2025-10-16wgengine/netlog: merge connstats into package (#17557)Joe Tsai1-3/+2
Merge the connstats package into the netlog package and unexport all of its declarations. Remove the buildfeatures.HasConnStats and use HasNetLog instead. Updates tailscale/corp#33352 Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2025-10-15net/connstats: prepare to remove package (#17554)Joe Tsai3-3/+4
The connstats package was an unnecessary layer of indirection. It was seperated out of wgengine/netlog so that net/tstun and wgengine/magicsock wouldn't need a depenedency on the concrete implementation of network flow logging. Instead, we simply register a callback for counting connections. This PR does the bare minimum work to prepare tstun and magicsock to only care about that callback. A future PR will delete connstats and merge it into netlog. Updates tailscale/corp#33352 Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2025-10-10types/persist: add AttestationKey (#17281)Patrick O'Doherty1-15/+40
Extend Persist with AttestationKey to record a hardware-backed attestation key for the node's identity. Add a flag to tailscaled to allow users to control the use of hardware-backed keys to bind node identity to individual machines. Updates tailscale/corp#31269 Change-Id: Idcf40d730a448d85f07f1bebf387f086d4c58be3 Signed-off-by: Patrick O'Doherty <patrick@tailscale.com>
2025-10-09feature/relayserver: init server at config time instead of request time (#17484)Jordan Whited1-1/+1
The lazy init led to confusion and a belief that was something was wrong. It's reasonable to expect the daemon to listen on the port at the time it's configured. Updates tailscale/corp#33094 Signed-off-by: Jordan Whited <jordan@tailscale.com>
2025-10-08go.toolchain.rev: bump Go to 1.25.2Brad Fitzpatrick3-1/+3
Updates tailscale/go#135 Change-Id: I89cfb49b998b2fd0264f8d5f4a61af839cd06626 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-07cmd/tailscaled: default state encryption off for incompatible args (#17480)Tom Proctor1-28/+38
Since #17376, containerboot crashes on startup in k8s because state encryption is enabled by default without first checking that it's compatible with the selected state store. Make sure we only default state encryption to enabled if it's not going to immediately clash with other bits of tailscaled config. Updates tailscale/corp#32909 Change-Id: I76c586772750d6da188cc97b647c6e0c1a8734f0 Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
2025-10-07feature/linkspeed: move cosmetic tstun netlink code out to modular featureBrad Fitzpatrick4-7/+7
Part of making all netlink monitoring code optional. Updates #17311 (how I got started down this path) Updates #12614 Change-Id: Ic80d8a7a44dc261c4b8678b3c2241c3b3778370d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-06util/checkchange: stop using deephash everywhereBrad Fitzpatrick4-5/+8
Saves 45 KB from the min build, no longer pulling in deephash or util/hashx, both with unsafe code. It can actually be more efficient to not use deephash, as you don't have to walk all bytes of all fields recursively to answer that two things are not equal. Instead, you can just return false at the first difference you see. And then with views (as we use ~everywhere nowadays), the cloning the old value isn't expensive, as it's just a pointer under the hood. Updates #12614 Change-Id: I7b08616b8a09b3ade454bb5e0ac5672086fe8aec Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-06cmd/tailscaled: guard some flag work with buildfeatures checksBrad Fitzpatrick1-29/+35
Updates #12614 Change-Id: Iec6f15d33a6500e7b0b7e8f5c098f7c00334460f Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-06feature/condlite/expvar: add expvar stub package when metrics not neededBrad Fitzpatrick4-8/+10
Saves ~53 KB from the min build. Updates #12614 Change-Id: I73f9544a9feea06027c6ebdd222d712ada851299 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-06feature/featuretags: make usermetrics modularBrad Fitzpatrick6-19/+16
Saves ~102 KB from the min build. Updates #12614 Change-Id: Ie1d4f439321267b9f98046593cb289ee3c4d6249 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-04wgengine: stop importing flowtrack when unusedBrad Fitzpatrick3-3/+3
Updates #12614 Change-Id: I42b5c4d623d356af4bee5bbdabaaf0f6822f2bf4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-04net/connstats: make it modular (omittable)Brad Fitzpatrick3-4/+3
Saves only 12 KB, but notably removes some deps on packages that future changes can then eliminate entirely. Updates #12614 Change-Id: Ibf830d3ee08f621d0a2011b1d4cd175427ef50df Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-04feature/c2n: move answerC2N code + deps out of control/controlclientBrad Fitzpatrick3-6/+5
c2n was already a conditional feature, but it didn't have a feature/c2n directory before (rather, it was using consts + DCE). This adds it, and moves some code, which removes the httprec dependency. Also, remove some unnecessary code from our httprec fork. Updates #12614 Change-Id: I2fbe538e09794c517038e35a694a363312c426a2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-03feature/ace: make ACE modularBrad Fitzpatrick3-4/+4
Updates #12614 Change-Id: Iaee75d8831c4ba5c9705d7877bb78044424c6da1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-03health: make it omittableBrad Fitzpatrick3-7/+7
Saves 86 KB. And stop depending on expvar and usermetrics when disabled, in prep to removing all the expvar/metrics/tsweb stuff. Updates #12614 Change-Id: I35d2479ddd1d39b615bab32b1fa940ae8cbf9b11 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-02appc,*: publish events for route updates and storage (#17392)M. J. Fromberger3-6/+6
Add and wire up event publishers for these two event types in the AppConnector. Nothing currently subscribes to them, so this is harmless. Subscribers for these events will be added in a near-future commit. As part of this, move the appc.RouteInfo type to the types/appctype package. It does not contain any package-specific details from appc. Beside it, add appctype.RouteUpdate to carry route update event state, likewise not specific to appc. Update all usage of the appc.* types throughout to use appctype.* instead, and update depaware files to reflect these changes. Add a Close method to the AppConnector to make sure the client gets cleaned up when the connector is dropped (we re-create connectors). Update the unit tests in the appc package to also check the events published alongside calls to the RouteAdvertiser. For now the tests still rely on the RouteAdvertiser for correctness; this is OK for now as the two methods are always performed together. In the near future, we need to rework the tests so not require that, but that will require building some more test fixtures that we can handle separately. Updates #15160 Updates #17192 Change-Id: I184670ba2fb920e0d2cb2be7c6816259bca77afe Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>
2025-10-02control/controlclient: remove x/net/http2, use net/httpBrad Fitzpatrick4-24/+18
Saves 352 KB, removing one of our two HTTP/2 implementations linked into the binary. Fixes #17305 Updates #15015 Change-Id: I53a04b1f2687dca73c8541949465038b69aa6ade Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-02feature/featuretags, all: add build features, use existing ones in more placesBrad Fitzpatrick4-14/+14
Saves 270 KB. Updates #12614 Change-Id: I4c3fe06d32c49edb3a4bb0758a8617d83f291cf5 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-01cmd/tailscaled: default --encrypt-state to true if TPM is available (#17376)Andrew Lytvynov2-5/+39
Whenever running on a platform that has a TPM (and tailscaled can access it), default to encrypting the state. The user can still explicitly set this flag to disable encryption. Updates https://github.com/tailscale/corp/issues/32909 Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
2025-10-01control/ts2021: rename from internal/noiseconn in prep for controlclient splitBrad Fitzpatrick3-3/+3
A following change will split out the controlclient.NoiseClient type out, away from the rest of the controlclient package which is relatively dependency heavy. A question was where to move it, and whether to make a new (a fifth!) package in the ts2021 dependency chain. @creachadair and I brainstormed and decided to merge internal/noiseconn and controlclient.NoiseClient into one package, with names ts2021.Conn and ts2021.Client. For ease of reviewing the subsequent PR, this is the first step that just renames the internal/noiseconn package to control/ts2021. Updates #17305 Change-Id: Ib5ea162dc1d336c1d805bdd9548d1702dd6e1468 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-01Makefile, cmd/*/depaware.txt: split out vendor packages explicitlyBrad Fitzpatrick3-15/+57
depaware was merging golang.org/x/foo and std's vendor/golang.org/x/foo packages (which could both be in the binary!), leading to confusing output, especially when I was working on eliminating duplicate packages imported under different names. This makes the depaware output longer and grosser, but doesn't hide reality from us. Updates #17305 Change-Id: I21cc3418014e127f6c1a81caf4e84213ce84ab57 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-10-01net/netmon: remove usage of direct callbacks from netmon (#17292)Claus Lensbøl2-10/+34
The callback itself is not removed as it is used in other repos, making it simpler for those to slowly transition to the eventbus. Updates #15160 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
2025-10-01all: use Go 1.20's errors.Join instead of our multierr packageBrad Fitzpatrick5-5/+3
Updates #7123 Change-Id: Ie9be6814831f661ad5636afcd51d063a0d7a907d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-09-30ipn/ipnlocal, engine: avoid runtime/pprof with two usages of ts_omit_debugBrad Fitzpatrick3-6/+4
Saves 258 KB. Updates #12614 Change-Id: I37c2f7f916480e3534883f338de4c64d08f7ef2b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-09-30feature/featuretags, ipn/conffile: make HuJSON support in config files optionalBrad Fitzpatrick3-4/+8
Saves 33 KB. Updates #12614 Change-Id: Ie701c230e0765281f409f29ed263910b9be9cc77 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-09-30feature/appconnectors: start making it modularBrad Fitzpatrick3-2/+3
Saves 45 KB. Updates #12614 Change-Id: Iaeb73e69633878ce0a0f58c986024784bbe218f1 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>