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45e64f2e1a
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21 Commits

Author SHA1 Message Date
Brad Fitzpatrick
45e64f2e1a net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS 
Fixes #2224
Fixes tailscale/corp#2045

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2021-06-23 16:04:10 -07:00
Brad Fitzpatrick
733d52827b net/dns/resolver: skip test on macOS 
Fixes #2229

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2021-06-23 08:13:55 -07:00
Adrian Dewhurst
8b11937eaf net/dns/resolver: permit larger max responses, signal truncation 
This raises the maximum DNS response message size from 512 to 4095. This
should be large enough for almost all situations that do not need TCP.
We still do not recognize EDNS, so we will still forward requests that
claim support for a larger response size than 4095 (that will be solved
later). For now, when a response comes back that is too large to fit in
our receive buffer, we now set the truncation flag in the DNS header,
which is an improvement from before but will prompt attempts to use TCP
which isn't supported yet.

On Windows, WSARecvFrom into a buffer that's too small returns an error
in addition to the data. On other OSes, the extra data is silently
discarded. In this case, we prefer the latter so need to catch the error
on Windows.

Partially addresses #1123

Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>
 2021-06-08 19:29:12 -04:00
David Anderson
7fab244614 net/dns/resolver: don't spam logs on EHOSTUNREACH. 
Fixes #1719.

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-06-07 10:45:29 -07:00
Josh Bleecher Snyder
25df067dd0 all: adapt to opaque netaddr types 
This commit is a mishmash of automated edits using gofmt:

gofmt -r 'netaddr.IPPort{IP: a, Port: b} -> netaddr.IPPortFrom(a, b)' -w .
gofmt -r 'netaddr.IPPrefix{IP: a, Port: b} -> netaddr.IPPrefixFrom(a, b)' -w .

gofmt -r 'a.IP.Is4 -> a.IP().Is4' -w .
gofmt -r 'a.IP.As16 -> a.IP().As16' -w .
gofmt -r 'a.IP.Is6 -> a.IP().Is6' -w .
gofmt -r 'a.IP.As4 -> a.IP().As4' -w .
gofmt -r 'a.IP.String -> a.IP().String' -w .

And regexps:

\w*(.*)\.Port = (.*)  ->  $1 = $1.WithPort($2)
\w*(.*)\.IP = (.*)  ->  $1 = $1.WithIP($2)

And lots of manual fixups.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
 2021-05-16 14:52:00 -07:00
David Anderson
30f5d706a1 net/dns/resolver: remove unnecessary/racy WaitGroup. 
Fixes #1663

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-22 19:17:37 -07:00
David Anderson
1a371b93be util/dnsname: add FQDN type, use throughout codebase. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-10 17:58:13 -07:00
David Anderson
6def647514 net/dns/resolver: don't avoid tailscale routes for DNS forwarding. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-08 12:20:42 -07:00
David Anderson
0ba6d03768 net/dns/resolver: add a test helper to get at the resolver config. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-07 15:40:31 -07:00
David Anderson
1bf91c8123 net/dns/resolver: remove unused err return value. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-05 10:55:35 -07:00
David Anderson
c4530971db net/dns/resolver: remove leftover debug print. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-05 10:55:35 -07:00
David Anderson
9f105d3968 net/dns/resolver: teach the forwarder to do per-domain routing. 
Given a DNS route map, the forwarder selects the right set of
upstreams for a given name.

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-01 19:42:48 -07:00
David Anderson
90f82b6946 net/dns/resolver: add live reconfig, plumb through to ipnlocal. 
The resolver still only supports a single upstream config, and
ipn/wgengine still have to split up the DNS config, but this moves
closer to unifying the DNS configs.

As a handy side-effect of the refactor, IPv6 MagicDNS records exist
now.

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-04-01 01:44:03 -07:00
David Anderson
caeafc4a32 net/dns/resolver: fix package docstring. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:42:28 -07:00
David Anderson
dbe4f6f42d net/dns/resolver: unexport Resolve and ResolveReverse. 
They're only used internally and in tests, and have surprising
semantics in that they only resolve MagicDNS names, not upstream
resolver queries.

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:35:26 -07:00
David Anderson
cdeb8d6816 net/dns/resolver: fix staticcheck error. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:19:09 -07:00
David Anderson
f185d62dc8 net/dns/resolver: unexport Packet, only use it internally. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:12:31 -07:00
David Anderson
5fb9e00ecf net/dns/resolver: remove Start method, fully spin up in New instead. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:12:31 -07:00
David Anderson
075fb93e69 net/dns/resolver: remove the Config struct. 
In preparation for reintroducing a runtime reconfig Config struct.

Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:12:31 -07:00
David Anderson
bc81dd4690 net/dns/resolver: rename ResolverConfig to just Config. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:12:31 -07:00
David Anderson
d99f5b1596 net/dns/resolver: factor the resolver out into a sub-package. 
Signed-off-by: David Anderson <danderson@tailscale.com>
 2021-03-31 23:12:30 -07:00