If IP forwarding is disabled globally, but enabled per-interface on all interfaces,
don't complain. If only some interfaces have forwarding enabled, warn that some
subnet routing/exit node traffic may not work.
Fixes#1586
Signed-off-by: David Anderson <danderson@tailscale.com>
It's a basic "deny everything" policy, since DERP's HTTP
server is very uninteresting from a browser POV. But it
stops every security scanner under the sun from reporting
"dangerously configured" HTTP servers.
Updates tailscale/corp#3119
Signed-off-by: David Anderson <danderson@tailscale.com>
Android doesn't use logpolicy and currently has enough
unique stuff about its logging that makes it difficult to
do so. For example, its logsDir comes from Gio.
Export NewLogtailTransport to let Android use it.
Updates https://github.com/tailscale/tailscale/issues/3046
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
Currently, comments in resolv.conf cause our parser to fail,
with error messages like:
ParseIP("192.168.0.100 # comment"): unexpected character (at " # comment")
Fix that.
Noticed while looking through logs.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
We were missing an argument here.
Also, switch to %q, in case anything weird
is happening with these strings.
Updates tailscale/corp#461
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
When this happens, it is incredibly noisy in the logs.
It accounts for about a third of all remaining
"unexpected" log lines from a recent investigation.
It's not clear that we know how to fix this,
we have a functioning workaround,
and we now have a (cheap and efficient) metric for this
that we can use for measurements.
So reduce the logging to approximately once per minute.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This limits the output to a single IP address.
RELNOTE=tailscale ip now has a -1 flag (TODO: update docs to use it)
Fixes#1921
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
These were supposed to be part of
3b541c833e but I guess I forgot to "git
add" them. Whoops.
Updates #3307
Change-Id: I8c768a61ec7102a01799e81dc502a22399b9e9f0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
One of the most common "unexpected" log lines is:
"network state changed, but stringification didn't"
One way that this can occur is if an interesting interface
(non-Tailscale, has interesting IP address)
gains or loses an uninteresting IP address (link local or loopback).
The fact that the interface is interesting is enough for EqualFiltered
to inspect it. The fact that an IP address changed is enough for
EqualFiltered to declare that the interfaces are not equal.
But the State.String method reasonably declines to print any
uninteresting IP addresses. As a result, the network state appears
to have changed, but the stringification did not.
The String method is correct; nothing interesting happened.
This change fixes this by adding an IP address filter to EqualFiltered
in addition to the interface filter. This lets the network monitor
ignore the addition/removal of uninteresting IP addresses.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Linux-only for now, to avoid having to figure out why
powershell doesn't like my shell scripting. (Not that I blame it.)
That'll be enough to catch most regressions.
Fixes#1083
Co-authored-by: Aaron Klotz <aaron@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
The Windows BOOL type is an int32. We were using a bool,
which is a one byte wide. This could be responsible for the
ERROR_INVALID_PARAMETER errors we were seeing for calls to
WinHttpGetProxyForUrl.
We manually checked all other existing Windows syscalls
for similar mistakes and did not find any.
Updates #879
Co-authored-by: Aaron Klotz <aaron@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
We replace the cmd.exe invocation with RtlGetNtVersionNumbers for the first
three fields. On Windows 10+, we query for the fourth field which is available
via the registry.
The fourth field is not really documented anywhere; Firefox has been querying
it successfully since Windows 10 was released, so we can be pretty confident in
its longevity at this point.
Fixes https://github.com/tailscale/tailscale/issues/1478
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
There are lots of lines in the logs of the form:
portmapper: unexpected PMP probe response: {OpCode:128 ResultCode:3
SecondsSinceEpoch:NNN MappingValidSeconds:0 InternalPort:0
ExternalPort:0 PublicAddr:0.0.0.0}
ResultCode 3 here means a network failure, e.g. the NAT box itself has
not obtained a DHCP lease. This is not an indication that something
is wrong in the Tailscale client, so use different wording here
to reflect that. Keep logging, so that we can analyze and debug
the reasons that PMP probes fail.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Lets the systemd-resolved OSConfigurator report health changes
for out of band config resyncs.
Updates #3327
Signed-off-by: David Anderson <danderson@tailscale.com>
In rare circumstances (tailscale/corp#3016), the PublicKey
and Endpoints can diverge.
This by itself doesn't cause any harm, but our early exit
in response did, because it prevented us from recovering from it.
Remove the early exit.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
At some point since filelogger was added on Windows, the log hierarchy
above it changed such that a log.Printf writes to filelogger and includes
the log package's own date. But then filelogger adds another.
Rather than debug everything above and risk removing the prefix when
run by tailscaled, instead just remove the log package's prefix
very late right before we go to add the filelogger's own.
Change-Id: I9db518f42c603ef83017f74827270f124fdf5c14
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Tailscale 1.18 uses netlink instead of the "ip" command to program the
Linux kernel.
The old way was kept primarily for tests, but this also adds a
TS_DEBUG_USE_IP_COMMAND environment knob to force the old way
temporarily for debugging anybody who might have problems with the
new way in 1.18.
Updates #391
Change-Id: I0236fbfda6c9c05dcb3554fcc27ec0c86456efd9
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
endpoint.discoKey is protected by endpoint.mu.
endpoint.sendDiscoMessage was reading it without holding the lock.
This showed up in a CI failure and is readily reproducible locally.
The fix is in two parts.
First, for Conn.enqueueCallMeMaybe, eliminate the one-line helper method endpoint.sendDiscoMessage; call Conn.sendDiscoMessage directly.
This makes it more natural to read endpoint.discoKey in a context
in which endpoint.mu is already held.
Second, for endpoint.sendDiscoPing, explicitly pass the disco key
as an argument. Again, this makes it easier to read endpoint.discoKey
in a context in which endpoint.mu is already held.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
