tailscale

Commit Graph

Author	SHA1	Message	Date
Andrew Dunham	27575cd52d	net/dnsfallback: shuffle returned IPs This ensures that we're trying multiple returned IPs, since the DERP servers return the same response to all queries. This should increase the chances that we eventually reach a working IP. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ie8d4fb93df96da910fae49ae71bf3e402b9fdecc	2 years ago
Mihai Parparita	9cb332f0e2	sockstats: instrument networking code paths Uses the hooks added by tailscale/go#45 to instrument the reads and writes on the major code paths that do network I/O in the client. The convention is to use "<package>.<type>:<label>" as the annotation for the responsible code path. Enabled on iOS, macOS and Android only, since mobile platforms are the ones we're most interested in, and we are less sensitive to any throughput degradation due to the per-I/O callback overhead (macOS is also enabled for ease of testing during development). For now just exposed as counters on a /v0/sockstats PeerAPI endpoint. We also keep track of the current interface so that we can break out the stats by interface. Updates tailscale/corp#9230 Updates #3363 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Mihai Parparita	780c56e119	ipn/ipnlocal: add delegated interface information to /interfaces PeerAPI handler Exposes the delegated interface data added by #7248 in the debug endpoint. I would have found it useful when working on that PR, and it may be handy in the future as well. Also makes the interfaces table slightly easier to parse by adding borders to it. To make then nicer-looking, the CSP was relaxed to allow inline styles. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
David Anderson	8b2ae47c31	version: unexport all vars, turn Short/Long into funcs The other formerly exported values aren't used outside the package, so just unexport them. Signed-off-by: David Anderson <danderson@tailscale.com>	2 years ago
Mihai Parparita	fa932fefe7	net/interfaces: redo how we get the default interface on macOS and iOS With #6566 we added an external mechanism for getting the default interface, and used it on macOS and iOS (see tailscale/corp#8201). The goal was to be able to get the default physical interface even when using an exit node (in which case the routing table would say that the Tailscale utun* interface is the default). However, the external mechanism turns out to be unreliable in some cases, e.g. when multiple cellular interfaces are present/toggled (I have occasionally gotten my phone into a state where it reports the pdp_ip1 interface as the default, even though it can't actually route traffic). It was observed that `ifconfig -v` on macOS reports an "effective interface" for the Tailscale utn* interface, which seems promising. By examining the ifconfig source code, it turns out that this is done via a SIOCGIFDELEGATE ioctl syscall. Though this is a private API, it appears to have been around for a long time (e.g. it's in the 10.13 xnu release at https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/net/if_types.h.auto.html) and thus is unlikely to go away. We can thus use this ioctl if the routing table says that a utun* interface is the default, and go back to the simpler mechanism that we had before #6566. Updates #7184 Updates #7188 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Mihai Parparita	21fda7f670	net/routetable: include unknown flags in the routetable doctor output As part of the work on #7248 I wanted to know all of the flags on the RouteMessage struct that we get back from macOS. Though it doesn't turn out to be useful (when using an exit node/Tailscale is the default route, the flags for the physical interface routes are the same), it still seems useful from a debugging/comprehensiveness perspective. Adds additional Darwin flags that were output once I enabled this mode. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Tom DNetto	2ca6dd1f1d	wgengine: start logging DISCO frames to pcap stream Signed-off-by: Tom DNetto <tom@tailscale.com>	2 years ago
Colin Adler	3c107ff301	net/connstats: fix ticker in NewStatistics (#7225 ) `:=` was accidentally used, so `maxPeriod` never worked. Signed-off-by: Colin Adler <colin1adler@gmail.com>	2 years ago
Mihai Parparita	62f4df3257	net/interfaces, net/netns: add node attributes to control default interface getting and binding With #6566 we started to more aggressively bind to the default interface on Darwin. We are seeing some reports of the wrong cellular interface being chosen on iOS. To help with the investigation, this adds to knobs to control the behavior changes: - CapabilityDebugDisableAlternateDefaultRouteInterface disables the alternate function that we use to get the default interface on macOS and iOS (implemented in tailscale/corp#8201). We still log what it would have returned so we can see if it gets things wrong. - CapabilityDebugDisableBindConnToInterface is a bigger hammer that disables binding of connections to the default interface altogether. Updates #7184 Updates #7188 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Brad Fitzpatrick	2477fc4952	net/netutil: only check Linux sysctls w/ procfs, assume absent means false Fixes #7217 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Tom DNetto	99b9d7a621	all: implement pcap streaming for datapath debugging Updates: tailscale/corp#8470 Signed-off-by: Tom DNetto <tom@tailscale.com>	2 years ago
Mihai Parparita	0e3fb91a39	net/dns/resolver: remove maxDoHInFlight It was originally added to control memory use on iOS (#2490), but then was relaxed conditionally when running on iOS 15 (#3098). Now that we require iOS 15, there's no need for the limit at all, so simplify back to the original state. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Mihai Parparita	b6908181ff	net/tshttpproxy: more directly use Transport proxy CONNECT hooks GetProxyConnectHeader (golang/go#41048) was upstreamed in Go 1.16 and OnProxyConnectResponse (golang/go#54299) in Go 1.20, thus we no longer need to guard their use by the tailscale_go build tag. Updates #7123 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
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	03645f0c27	net/{netns,netstat}: use new x/sys/cpu.IsBigEndian See golang/go#57237 Change-Id: If47ab6de7c1610998a5808e945c4177c561eab45 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Andrew Dunham	2755f3843c	health, net/tlsdial: add healthcheck for self-signed cert When we make a connection to a server, we previously would verify with the system roots, and then fall back to verifying with our baked-in Let's Encrypt root if the system root cert verification failed. We now explicitly check for, and log a health error on, self-signed certificates. Additionally, we now always verify against our baked-in Let's Encrypt root certificate and log an error if that isn't successful. We don't consider this a health failure, since if we ever change our server certificate issuer in the future older non-updated versions of Tailscale will no longer be healthy despite being able to connect. Updates #3198 Change-Id: I00be5ceb8afee544ee795e3c7a2815476abc4abf Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
Brad Fitzpatrick	cf8dd7aa09	all: use Go 1.20's bytes.Clone Updates #7123 Updates #6257 (more to do in other repos) Change-Id: I073e2a6d81a5d7fbecc29caddb7e057ff65239d0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	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
Maisem Ali	5bba65e978	net/memnet: rename from net/nettest This is just #cleanup to resolve a TODO Also add a package doc. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Will Norris	947c14793a	all: update tools that manage copyright headers Update all code generation tools, and those that check for license headers to use the new standard header. Also update copyright statement in LICENSE file. Fixes #6865 Signed-off-by: Will Norris <will@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
Andrew Dunham	50da265608	net/netns: add post-review comments Follow-up to #7065 with some comments from Brad's review. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ia1219f4fa25479b2dada38ffe421065b408c5954	2 years ago
Brad Fitzpatrick	2fc8de485c	net/netstat: document the Windows netstat code a bit more And defensively bound allocation. Updates tailscale/corp#8878 Change-Id: Iaa07479ea2ea28ee1ac3326ab025046d6d785b00 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Aaron Klotz	4a869048bf	net/netstat: add nil checks to Windows OSMetadata implementation The API documentation does claim to output empty strings under certain conditions, but we're sometimes seeing nil pointers in the wild, not empty strings. Fixes https://github.com/tailscale/corp/issues/8878 Signed-off-by: Aaron Klotz <aaron@tailscale.com>	2 years ago
Andrew Dunham	2703d6916f	net/netns: add functionality to bind outgoing sockets based on route table When turned on via environment variable (off by default), this will use the BSD routing APIs to query what interface index a socket should be bound to, rather than binding to the default interface in all cases. Updates #5719 Updates #5940 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ib4c919471f377b7a08cd3413f8e8caacb29fee0b	2 years ago
Andrew Dunham	44d73ce932	ipn/ipnlocal, net/dnscache: allow configuring dnscache logging via capability This allows users to temporarily enable/disable dnscache logging via a new node capability, to aid in debugging strange connectivity issues. Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I46cf2596a8ae4c1913880a78d0033f8b668edc08	2 years ago
Brad Fitzpatrick	d5100e0910	net/connstats: mark TestConcurrent as flaky Updates #7030 Change-Id: Ic46da5e5690b90b95028a68a3cf967ad86881e28 Signed-off-by: Brad Fitzpatrick <bradfitz@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
andig	5f96d6211a	Remove redundant type declaration Signed-off-by: andig <cpuidle@gmx.de>	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
Brad Fitzpatrick	6d85a94767	net/{packet,tstun}: fix typo in test helper docs Change-Id: Ifc1684fe77c7d2585e049e0dfd7340910c47a67a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	c1a2e2c380	net/{packet,tstun},wgengine/filter: fix unknown IP protocol handling `01b90df2fa` added SCTP support before (with explicit parsing for ports) and `69de3bf7bf` tried to add support for arbitrary IP protocols (as long as the ACL permited a port of "", since we might not know how to find ports from an arbitrary IP protocol, if it even has such a concept). But apparently that latter commit wasn't tested end-to-end enough. It had a lot of tests, but the tests made assumptions about layering that either weren't true, or regressed since 1.20. Notably, it didn't remove the (Filter).pre bidirectional filter that dropped all "unknown" protocol packets both leaving and entering, even if there were explicit protocol matches allowing them in. Also, don't map all unknown protocols to 0. Keep their IP protocol number parsed so it's matchable by later layers. Only reject illegal things. Fixes #6423 Updates #2162 Updates #2163 Change-Id: I9659b3ece86f4db51d644f9b34df78821758842c Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Jordan Whited	25a0091f69	net/portmapper: relax handling of UPnP resp (#6946 ) Gateway devices operating as an HA pair w/VRRP or CARP may send UPnP replies from static addresses rather than the floating gateway address. This commit relaxes our source address verification such that we parse responses from non-gateway IPs, and re-point the UPnP root desc URL to the gateway IP. This ensures we are still interfacing with the gateway device (assuming L2 security intact), even though we got a root desc from a non-gateway address. This relaxed handling is required for ANY port mapping to work on certain OPNsense/pfsense distributions using CARP at the time of writing, as miniupnpd may only listen on the static, non-gateway interface address for PCP and PMP. Fixes #5502 Signed-off-by: Jordan Whited <jordan@tailscale.com>	2 years ago
Tom DNetto	2ac5474be1	net/flowtrack,wgengine/filter: refactor Cache to use generics Signed-off-by: Tom DNetto <tom@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
James Tucker	b2c55e62c8	net/tlsdial,tstest,version: use go command from $PATH Go now includes the GOROOT bin directory in $PATH while running tests and generate, so it is no longer necessary to construct a path using runtime.GOROOT(). Fixes #6689 Signed-off-by: James Tucker <james@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
andig	14e8afe444	go.mod, etc: bump gvisor Fixes #6554 Change-Id: Ia04ae37a47b67fa57091c9bfe1d45a1842589aa8 Signed-off-by: andig <cpuidle@gmx.de>	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
Aaron Klotz	296f53524c	netstat, portlist: update Windows implementation to disambiguate svchost processes We change our invocations of GetExtendedTcpTable to request additional information about the "module" responsible for the port. In addition to pid, this output also includes sufficient metadata to enable Windows to resolve process names and disambiguate svchost processes. We store the OS-specific output in an OSMetadata field in netstat.Entry, which portlist may then use as necessary to actually resolve the process/module name. Signed-off-by: Aaron Klotz <aaron@tailscale.com>	2 years ago
Joe Tsai	d9df023e6f	net/connstats: enforce maximum number of connections (#6760 ) The Tailscale logging service has a hard limit on the maximum log message size that can be accepted. We want to ensure that netlog messages never exceed this limit otherwise a client cannot transmit logs. Move the goroutine for periodically dumping netlog messages from wgengine/netlog to net/connstats. This allows net/connstats to manage when it dumps messages, either based on time or by size. Updates tailscale/corp#8427 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Jordan Whited	55b24009f7	net/tstun: don't return early from a partial tun.Read() (#6745 ) Fixes #6730 Signed-off-by: Jordan Whited <jordan@tailscale.com>	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
Jordan Whited	ea5ee6f87c	all: update golang.zx2c4.com/wireguard to github.com/tailscale/wireguard-go (#6692 ) This is temporary while we work to upstream performance work in https://github.com/WireGuard/wireguard-go/pull/64. A replace directive is less ideal as it breaks dependent code without duplication of the directive. Signed-off-by: Jordan Whited <jordan@tailscale.com>	2 years ago
Maisem Ali	eb1adf629f	net/tstun: reuse buffered packet from pool We would call parsedPacketPool.Get() for all packets received in Read/Write. This was wasteful and not necessary, fetch a single *packet.Parsed for all packets. Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Jordan Whited	76389d8baf	net/tstun, wgengine/magicsock: enable vectorized I/O on Linux (#6663 ) This commit updates the wireguard-go dependency and implements the necessary changes to the tun.Device and conn.Bind implementations to support passing vectors of packets in tailscaled. This significantly improves throughput performance on Linux. Updates #414 Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: James Tucker <james@tailscale.com> Co-authored-by: James Tucker <james@tailscale.com>	2 years ago
Brad Fitzpatrick	1598cd0361	net/tsaddr: remove ContainsFunc helpers (they're now in x/exp/slices) x/exp/slices now has ContainsFunc (golang/go#53983) so we can delete our versions. Change-Id: I5157a403bfc1b30e243bf31c8b611da25e995078 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Mihai Parparita	79f3a5d753	net/netns, net/interfaces: explicitly bind sockets to the default interface on all Darwin variants We were previously only doing this for tailscaled-on-Darwin, but it also appears to help on iOS. Otherwise, when we rebind magicsock UDP connections after a cellular -> WiFi interface change they still keep using cellular one. To do this correctly when using exit nodes, we need to exclude the Tailscale interface when getting the default route, otherwise packets cannot leave the tunnel. There are native macOS/iOS APIs that we can use to do this, so we allow those clients to override the implementation of DefaultRouteInterfaceIndex. Updates #6565, may also help with #5156 Signed-off-by: Mihai Parparita <mihai@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
Joe Tsai	2e5d08ec4f	net/connstats: invert network logging data flow (#6272 ) Previously, tstun.Wrapper and magicsock.Conn managed their own statistics data structure and relied on an external call to Extract to extract (and reset) the statistics. This makes it difficult to ensure a maximum size on the statistics as the caller has no introspection into whether the number of unique connections is getting too large. Invert the control flow such that a connstats.Statistics is registered with tstun.Wrapper and magicsock.Conn. Methods on non-nil connstats.Statistics are called for every packet. This allows the implementation of connstats.Statistics (in the future) to better control when it needs to flush to ensure bounds on maximum sizes. The value registered into tstun.Wrapper and magicsock.Conn could be an interface, but that has two performance detriments: 1. Method calls on interface values are more expensive since they must go through a virtual method dispatch. 2. The implementation would need a sync.Mutex to protect the statistics value instead of using an atomic.Pointer. Given that methods on constats.Statistics are called for every packet, we want reduce the CPU cost on this hot path. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Denton Gentry	b8fe89d15f	net/portmapper: add test for Huawei router Updates https://github.com/tailscale/tailscale/issues/6320 Signed-off-by: Denton Gentry <dgentry@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	e9c851b04b	ipn/ipnlocal: also accept service IP IPv6 literal in brackets for quad100 The fix in `4fc8538e2` was sufficient for IPv6. Browsers (can?) send the IPv6 literal, even without a port number, in brackets. Updates tailscale/corp#7948 Change-Id: I0e429d3de4df8429152c12f251ab140b0c8f6b77 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Maisem Ali	22238d897b	all: standardize on PeerAPI Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Brad Fitzpatrick	fb392e34b5	net/tshttpproxy: don't ignore env-based HTTP proxies after system lookups fail There was a mechanism in tshttpproxy to note that a Windows proxy lookup failed and to stop hitting it so often. But that turns out to fire a lot (no PAC file configured at all results in a proxy lookup), so after the first proxy lookup, we were enabling the "omg something's wrong, stop looking up proxies" bit for awhile, which was then also preventing the normal Go environment-based proxy lookups from working. This at least fixes environment-based proxies. Plenty of other Windows-specific proxy work remains (using WinHttpGetIEProxyConfigForCurrentUser instead of just PAC files, ignoring certain types of errors, etc), but this should fix the regression reported in #4811. Updates #4811 Change-Id: I665e1891897d58e290163bda5ca51a22a017c5f9 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	3114eacbb8	ipn/ipnlocal: don't warn about serve listener failing on IPv6-less machines Fixes #6303 Change-Id: Ie1ce12938f68dfa0533246bbe3b9d7f3e749a243 Signed-off-by: Brad Fitzpatrick <bradfitz@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
Maisem Ali	8e85227059	cmd/tailscale/cli: [set] handle selectively modifying routes/exit node Noticed this while debugging something else, we would reset all routes if either `--advertise-exit-node` or `--advertise-routes` were set. This handles correctly updating them. Also added tests. Signed-off-by: Maisem Ali <maisem@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
Andrew Dunham	e85613aa2d	net/netcheck: don't use a space in the captive portal challenge The derpers don't allow whitespace in the challenge. Change-Id: I93a8b073b846b87854fba127b5c1d80db205f658 Signed-off-by: Andrew Dunham <andrew@tailscale.com>	2 years ago
Andrew Dunham	c2d7940ec0	cmd/tailscaled, net/tstun: add build tags to omit BIRD and TAP Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I7a39f4eeeb583b73ecffaf4c5f086a38e3a53e2e	2 years ago
Brad Fitzpatrick	036334e913	net/netcheck: deflake (maybe) magicsock's TestNewConn Updates #6207 Change-Id: I51d200d0b42b9a1ef799d0abfc8d4bd871c50cf2 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
Brad Fitzpatrick	d57cba8655	net/tshttpproxy: add clientmetrics on Windows proxy lookup paths To collect some data on how widespread this is and whether there's any correlation between different versions of Windows, etc. Updates #4811 Change-Id: I003041d0d7e61d2482acd8155c1a4ed413a2c5c4 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Brad Fitzpatrick	f4ff26f577	types/pad32: delete package Use Go 1.19's new 64-bit alignment ~hidden feature instead. Fixes #5356 Change-Id: Ifcbcb115875a7da01df3bc29e9e7feadce5bc956 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
Joe Tsai	c21a3c4733	types/netlogtype: new package for network logging types (#6092 ) The netlog.Message type is useful to depend on from other packages, but doing so would transitively cause gvisor and other large packages to be linked in. Avoid this problem by moving all network logging types to a single package. We also update staticcheck to take in: `003d277bcf` Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Andrew Dunham	95f3dd1346	net/interfaces: don't dereference null pointer if no destination/netmask Fixes #6065 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I7159b8cbb8d5f47c0668cf83e59167f182f1defd	2 years ago
Andrew Dunham	ba459aeef5	net/interfaces: don't call GetList in List.ForeachInterface It looks like this was left by mistake in `4a3e2842`. Change-Id: Ie4e3d5842548cd2e8533b3552298fb1ce9ba761a Signed-off-by: Andrew Dunham <andrew@tailscale.com>	2 years ago
Peter Cai	4597ec1037	net/dnscache: Handle 4-in-6 addresses in DNS responses On Android, the system resolver can return IPv4 addresses as IPv6-mapped addresses (i.e. `::ffff:a.b.c.d`). After the switch to `net/netip` (`19008a3`), this case is no longer handled and a response like this will be seen as failure to resolve any IPv4 addresses. Handle this case by simply calling `Unmap()` on the returned IPs. Fixes #5698. Signed-off-by: Peter Cai <peter@typeblog.net>	2 years ago
Andrew Dunham	74693793be	net/netcheck, tailcfg: track whether OS supports IPv6 We had previously added this to the netcheck report in #5087 but never copied it into the NetInfo struct. Additionally, add it to log lines so it's visible to support. Change-Id: Ib6266f7c6aeb2eb2a28922aeafd950fe1bf5627e Signed-off-by: Andrew Dunham <andrew@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
Andrew Dunham	223126fe5b	cmd/derper, net/netcheck: add challenge/response to generate_204 endpoint The Lufthansa in-flight wifi generates a synthetic 204 response to the DERP server's /generate_204 endpoint. This PR adds a basic challenge/response to the endpoint; something sufficiently complicated that it's unlikely to be implemented by a captive portal. We can then check for the expected response to verify whether we're being MITM'd. Follow-up to #5601 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I94a68c9a16a7be7290200eea6a549b64f02ff48f	2 years ago
Anton Tolchanov	d499afac78	net/interfaces: improve default route detection Instead of treating any interface with a non-ifscope route as a potential default gateway, now verify that a given route is actually a default route (0.0.0.0/0 or ::/0). Fixes #5879 Signed-off-by: Anton Tolchanov <anton@tailscale.com>	2 years ago
Anton Tolchanov	9c2ad7086c	net/interfaces: deduplicate route table parsing on Darwin and FreeBSD Signed-off-by: Anton Tolchanov <anton@tailscale.com>	2 years ago
Mihai Parparita	9d04ffc782	net/wsconn: add back custom wrapper for turning a websocket.Conn into a net.Conn We removed it in #4806 in favor of the built-in functionality from the nhooyr.io/websocket package. However, it has an issue with deadlines that has not been fixed yet (see nhooyr/websocket#350). Temporarily go back to using a custom wrapper (using the fix from our fork) so that derpers will stop closing connections too aggressively. Updates #5921 Signed-off-by: Mihai Parparita <mihai@tailscale.com>	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
Brad Fitzpatrick	9a264dac01	net/netcheck: fix crash in checkCaptivePortal If netcheck happens before there's a derpmap. This seems to only affect Headscale because it doesn't send a derpmap as early? Change-Id: I51e0dfca8e40623e04702bc9cc471770ca20d2c2 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	2 years ago
Joe Tsai	1b4e4cc1e8	wgengine/netlog: new package for traffic flow logging (#5864 ) The Logger type managers a logtail.Logger for extracting statistics from a tstun.Wrapper. So long as Shutdown is called, it ensures that logtail and statistic gathering resources are properly cleared up. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Maisem Ali	ecf6cdd830	ssh/tailssh: add TestSSHAuthFlow Signed-off-by: Maisem Ali <maisem@tailscale.com>	2 years ago
Joe Tsai	84e8f25c21	net/tstun: rename statististics method (#5852 ) Rename StatisticsEnable as SetStatisticsEnabled to be consistent with other similarly named methods. Rename StatisticsExtract as ExtractStatistics to follow the convention where methods start with a verb. It was originally named with Statistics as a prefix so that statistics related methods would sort well in godoc, but that property no longer holds. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	dd045a3767	net/flowtrack: add json tags to Tuple (#5849 ) By convention, JSON serialization uses camelCase. Specify such names on the Tuple type. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	a73c423c8a	net/tunstats: add Counts.Add (#5848 ) The Counts.Add method merges two Counts together. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	24ebf161e8	net/tstun: instrument Wrapper with statistics gathering (#5847 ) If Wrapper.StatisticsEnable is enabled, then per-connection counters are maintained. If enabled, Wrapper.StatisticsExtract must be periodically called otherwise there is unbounded memory growth. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	2934c5114c	net/tunstats: new package to track per-connection counters (#5818 ) High-level API: type Statistics struct { ... } type Counts struct { TxPackets, TxBytes, RxPackets, RxBytes uint64 } func (Statistics) UpdateTx([]byte) func (Statistics) UpdateRx([]byte) func (*Statistics) Extract() map[flowtrack.Tuple]Counts The API accepts a []byte instead of a packet.Parsed so that a future implementation can directly hash the address and port bytes, which are contiguous in most IP packets. This will be useful for a custom concurrent-safe hashmap implementation. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	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
Emmanuel T Odeke	f981b1d9da	all: fix resource leaks with missing .Close() calls Fixes #5706 Signed-off-by: Emmanuel T Odeke <emmanuel@orijtech.com>	2 years ago
Andrew Dunham	b1867457a6	doctor: add package for running in-depth healthchecks; use in bugreport (#5413 ) Change-Id: Iaa4e5b021a545447f319cfe8b3da2bd3e5e5782b Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
James Tucker	f7cb535693	net/speedtest: retune to meet iperf on localhost in a VM - removed some in-flow time calls - increase buffer size to 2MB to overcome syscall cost - move relative time computation from record to report time Signed-off-by: James Tucker <james@tailscale.com>	2 years ago
James Tucker	146f51ce76	net/packet: fix filtering of short IPv4 fragments The fragment offset is an 8 byte offset rather than a byte offset, so the short packet limit is now in fragment block size in order to compare with the offset value. The packet flags are in the first 3 bits of the flags/frags byte, and so after conversion to a uint16 little endian value they are at the start, not the end of the value - the mask for extracting "more fragments" is adjusted to match this byte. Extremely short fragments less than 80 bytes are dropped, but fragments over 80 bytes are now accepted. Fixes #5727 Signed-off-by: James Tucker <james@tailscale.com>	2 years ago
Andrew Dunham	c6162c2a94	net/netcheck: add check for captive portal (#5593 ) This doesn't change any behaviour for now, other than maybe running a full netcheck more often. The intent is to start gathering data on captive portals, and additionally, seeing this in the 'tailscale netcheck' command should provide a bit of additional information to users. Updates #1634 Change-Id: I6ba08f9c584dc0200619fa97f9fde1a319f25c76 Signed-off-by: Andrew Dunham <andrew@du.nham.ca>	2 years ago
Denton Gentry	42f1d92ae0	net/netns: implement UseSocketMark for Android. Build fails on Android: `../../../../go/pkg/mod/tailscale.com@v1.1.1-0.20220916223019-65c24b6334e9/wgengine/magicsock/magicsock_linux.go:133:12: undefined: netns.UseSocketMark` Signed-off-by: Denton Gentry <dgentry@tailscale.com>	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

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803 Commits (f352f8a0e6e55eb6a0397853d9acbbaa2cf7fe4e)