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of hard failing
Instead of hard failing on a single bad record, filter the bad records
and return anything valid. This only applies to the methods which can
return multiple records, LookupMX, LookupNS, LookupSRV, and LookupAddr.
When bad results are filtered out, also return an error, indicating
that this filtering has happened.
Updates #46241
Updates #46979
Fixes #47012
Change-Id: I6493e0002beaf89f5a9795333a93605abd30d171
Reviewed-on: https://go-review.googlesource.com/c/go/+/332549
Trust: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
(cherry picked from commit 296ddf2a936a30866303a64d49bc0e3e034730a8)
Reviewed-on: https://go-review.googlesource.com/c/go/+/333331
Run-TryBot: Roland Shoemaker <roland@golang.org>
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Bypass hostname validity checking when a null mx record is returned as,
defined in RFC 7505.
Updates #46979
Updates #47012
Change-Id: Ibe683bd6b47333a8ff30909fb2680ec8e10696ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/332094
Trust: Roland Shoemaker <roland@golang.org>
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
(cherry picked from commit 03761ede028d811dd7d7cf8a2690d4bfa2771d85)
Reviewed-on: https://go-review.googlesource.com/c/go/+/332372
Run-TryBot: Katie Hockman <katie@golang.org>
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For the methods LookupCNAME, LookupSRV, LookupMX, LookupNS, and
LookupAddr check that the returned domain names are in fact valid DNS
names using the existing isDomainName function.
Thanks to Philipp Jeitner and Haya Shulman from Fraunhofer SIT for
reporting this issue.
Updates #46241
Fixes #46356
Fixes CVE-2021-33195
Change-Id: I47a4f58c031cb752f732e88bbdae7f819f0af4f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/323131
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
(cherry picked from commit cdcd02842da7c004efd023881e3719105209c908)
Reviewed-on: https://go-review.googlesource.com/c/go/+/323269
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Previously, looking up only IPv4 or IPv6 addresses was only possible
with DefaultResolver via ResolveIPAddr. Add this functionality to the
Resolver type with a new method, LookupIP. This largely brings Resolver
functionally to parity with the global functions. The name LookupIP is
used over ResolveIPAddr to be consistent with the other Resolver
methods.
There are two main benefits to (*Resolver).LookupIP over
(*Resolver).LookupHost. First is an ergonomic benefit. Wanting a
specific family of address is common enough to justify a method, evident
by the existence of ResolveIPAddr. Second, this opens the possibility of
not performing unnecessary DNS requests when only a specific family of
addresses are needed. This optimization is left to follow up work.
Updates #30452
Change-Id: I241f61019588022a39738f8920b0ddba900cecdd
Reviewed-on: https://go-review.googlesource.com/c/go/+/228641
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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You were a useful port and you've served your purpose.
Thanks for all the play.
A subsequent CL will remove amd64p32 (including assembly files and
toolchain bits) and remaining bits. The amd64p32 removal will be
separated into its own CL in case we want to support the Linux x32 ABI
in the future and want our old amd64p32 support as a starting point.
Updates #30439
Change-Id: Ia3a0c7d49804adc87bf52a4dea7e3d3007f2b1cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/199499
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This adds the ability to determine if a lookup error was
due to a non-existent hostname. Previously users needed
to do string matching on the DNSError.Err value.
Fixes #28635
Change-Id: If4bd3ad32cbc2db5614f2c6b72e0a9161d813efa
Reviewed-on: https://go-review.googlesource.com/c/go/+/168597
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Though there is variation in the spelling of canceled,
cancellation is always spelled with a double l.
Reference: https://www.grammarly.com/blog/canceled-vs-cancelled/
Change-Id: I240f1a297776c8e27e74f3eca566d2bc4c856f2f
Reviewed-on: https://go-review.googlesource.com/c/go/+/170060
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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In CL 120215 the cgo resolver was changed to have different logic based
on the network being queried. However, the singleflight cache key wasn't
updated to also include the network. This way it was possible for
concurrent queries to return the result for the wrong network.
This CL changes the key to include both network and host, fixing the
problem.
Fixes #30521
Change-Id: I8b41b0ce1d9a02d18876c43e347654312eba22fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/166037
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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To avoid any cancelation of the parent context from affecting
lookupGroup operations, Resolver.LookupIPAddr previously used
an entirely new context created from context.Background().
However, this meant that all the values in the parent context
with which LookupIPAddr was invoked were dropped.
This change provides a custom context implementation
that only preserves values of the parent context by composing
context.Background() and the parent context. It only falls back
to the parent context to perform value lookups if the parent
context has not yet expired.
This context is never canceled, and has no deadlines.
Fixes #28600
Change-Id: If2f570caa26c65bad638b7102c35c79d5e429fea
Reviewed-on: https://go-review.googlesource.com/c/148698
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Unlike the go resolver, the existing cgo resolver exchanges both DNS A
and AAAA RR queries unconditionally and causes unreasonable connection
setup latencies to applications using the cgo resolver.
This change adds new argument (`network`) in all functions through the
series of calls: from Resolver.internetAddrList to cgoLookupIPCNAME.
Benefit: no redundant DNS calls if certain IP version is used IPv4/IPv6
(no `AAAA` DNS requests if used tcp4, udp4, ip4 network. And vice
versa: no `A` DNS requests if used tcp6, udp6, ip6 network)
Fixes #25947
Change-Id: I39edbd726d82d6133fdada4d06cd90d401e7e669
Reviewed-on: https://go-review.googlesource.com/c/120215
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Allow a zone to be included with the ip address that is parsed when
using DefaultResolver's LookupHost or LookupIPAddr
Fixes #20790
Fixes #20767
Change-Id: I4e0baf9ade6a095af10a1b85ca6216788ba680ae
Reviewed-on: https://go-review.googlesource.com/79935
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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The current resolver uses a global lookupGroup which merges LookupIPAddr
calls together for lookups for the same hostname if used concurrently.
As a result only one of the resolvers is actually used to perform the
DNS lookup but the result is shared by all the resolvers.
This commit limits the scope of the lookupGroup to the resolver itself
allowing each resolver to make its own requests without sharing the
result with other resolvers.
Fixes #22908
Change-Id: Ibba896eebb05e59f18ce4132564ea1f2b4b6c6d9
Reviewed-on: https://go-review.googlesource.com/80775
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Add accessors that handle nil without crashing.
Fixes #24330
Change-Id: If5fbbb6015ca8d65f620a06bad6e52de8cd896ad
Reviewed-on: https://go-review.googlesource.com/101315
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
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Updates #8602
Updates #20703
Fixes #22724
Change-Id: I27b72311b2c66148c59977361bd3f5101e47b51d
Reviewed-on: https://go-review.googlesource.com/100840
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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iana.org, www.iana.org and data.iana.org all present a valid TLS
certificate, so let's use it when fetching data or linking to
resources to avoid errors in transit.
Change-Id: Ib3ce7c19789c4e9d982a776b61d8380ddc63194d
Reviewed-on: https://go-review.googlesource.com/89416
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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The DNS code can start goroutines and not wait for them to complete.
This does no harm, but in tests this can cause a race condition with
the test hooks that are installed and unintalled around the tests.
Add a WaitGroup that tests of DNS can use to avoid the race.
Fixes #21090
Change-Id: I6c1443a9c2378e8b89d0ab1d6390c0e3e726b0ce
Reviewed-on: https://go-review.googlesource.com/82795
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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This reverts commit 6a3d4be3b80054b1d802b73d5a519e252e0f82ed.
Reason for revert: breaks various builds. See comments on CL 77670
Change-Id: Iaf3260319b560f49ace06af705a2114630f32063
Reviewed-on: https://go-review.googlesource.com/78515
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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A sequential lookup using any non-canceled context has a risk of
returning the result of the previous lookup for a canceled context (i.e.
an error).
This is already prevented for timed out context by forgetting the host
immediately and extending this to also compare the error to
`context.Canceled` resolves this issue.
Fixes #22724
Change-Id: I7aafa1459a0de4dc5c4332988fbea23cbf4dba07
Reviewed-on: https://go-review.googlesource.com/77670
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Change-Id: If5495f66d175bdacebd599abf1e064d2343669c2
Reviewed-on: https://go-review.googlesource.com/34430
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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This change clarifies the documentation on Dial and its variants to
avoid unnecessary confusion about how the arguments for the connection
setup functions are used to make connections.
Also replaces "name" or "hostname" with "host name" when the term
implies the use of DNS.
Updates #17613.
Fixes #17614.
Fixes #17738.
Fixes #17956.
Updates #18806.
Change-Id: I6adb3f2ae04a3bf83b96016ed73d8e59926f3e8a
Reviewed-on: https://go-review.googlesource.com/34875
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Only forget about it if the context timed out, as the comment says.
Fixes #20703.
Change-Id: Ie6234f1a32f85e6bfd052dc24a33aa63b8883c37
Reviewed-on: https://go-review.googlesource.com/45999
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Allow the Resolver.Dial func to return instances of Conn other than
*TCPConn and *UDPConn. If the Conn is also a PacketConn, assume DNS
messages transmitted over the Conn adhere to section 4.2.1. "UDP usage".
Otherwise, follow section 4.2.2. "TCP usage".
Provides a hook mechanism so that DNS queries generated by the net
package may be answered or modified before being sent to over the
network.
Updates #19910
Change-Id: Ib089a28ad4a1848bbeaf624ae889f1e82d56655b
Reviewed-on: https://go-review.googlesource.com/45153
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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In some cases it is desirable to customize the way the DNS server is
contacted, for instance to use a specific LocalAddr. While most
operating-system level resolvers do not allow this, we have the
opportunity to do so with the Go resolver. Most of the code was
already in place to allow tests to override the dialer. This exposes
that functionality, and as a side effect eliminates the need for a
testing hook.
Fixes #17404
Change-Id: I1c5e570f8edbcf630090f8ec6feb52e379e3e5c0
Reviewed-on: https://go-review.googlesource.com/37260
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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When LookupIP is performing multiple subqueries, this option causes a
timeout/servfail affecting a single query to abort the whole operation,
instead of returning a partial (IPv4/IPv6-only) result.
Similarly, operations that walk the DNS search list will also abort when
encountering one of these errors.
Fixes #17448
Change-Id: Ice22e4aceb555c5a80d19bd1fde8b8fe87ac9517
Reviewed-on: https://go-review.googlesource.com/32572
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Fixes #18172.
Change-Id: I4a21fb5c0753cced025a03d88a6dd1aa3ee01d05
Reviewed-on: https://go-review.googlesource.com/34650
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Text from rsc.
Fixes #17093
Change-Id: I13c3018b1584f152b53f8576dd16ebef98aa5182
Reviewed-on: https://go-review.googlesource.com/31720
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Fixes #17532
Change-Id: Id62671d505c77ea924b3570a504cdc3b157e5a0d
Reviewed-on: https://go-review.googlesource.com/31734
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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The new Resolver type (a struct) has 9 Lookup methods, all taking a
context.Context.
There's now a new DefaultResolver global, like http's
DefaultTransport and DefaultClient.
net.Dialer now has an optional Resolver field to set the Resolver.
This also does finishes some resolver cleanup internally, deleting
lookupIPMerge and renaming lookupIPContext into Resolver.LookupIPAddr.
The Resolver currently doesn't let you tweak much, but it's a struct
specifically so we can add knobs in the future. Currently I just added
a bool to force the pure Go resolver. In the future we could let
people provide an interface to implement the methods, or add a Timeout
time.Duration, which would wrap all provided contexts in a
context.WithTimeout.
Fixes #16672
Change-Id: I7ba1f886704f06def7b6b5c4da9809db51bc1495
Reviewed-on: https://go-review.googlesource.com/29440
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Also, flesh out the baked-in /etc/services table for LookupPort a bit.
This services map moves from a unix-specific file to a portable file
where nacl can use it.
Also, remove the duplicated entries in the protocol map in different
cases, and just canonicalize the input before looking in the map. Now
it handles any case, including MiXeD cAse.
In the process, add a test that service names for LookupPort are case
insensitive. They were on Windows, but not cgo. Now there's a test and
they're case insensitive in all 3+ paths. Maybe it breaks plan9. We'll
see.
Fixes #17045
Change-Id: Idce7d68703f371727c7505cda03a32bd842298cd
Reviewed-on: https://go-review.googlesource.com/28951
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
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Updates #12580
Change-Id: I9f9578148ef2b48dffede1007317032d39f6af55
Reviewed-on: https://go-review.googlesource.com/22191
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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My previous https://golang.org/cl/22101 to add context throughout the
net package broke Plan 9, which isn't currently tested (#15251).
It also broke some old unsupported version of Windows (Windows 2000?)
which doesn't have the ConnectEx function, but that was only found
visually, since our minimum supported Windows version has ConnectEx.
This change simplifies the Windows and deletes the non-ConnectEx code
path. Windows 2000 will work even less now, if it even worked
before. Windows XP remains our minimum supported version.
Specifically, the previous CL stopped using the "dial" function, which
0intro noted:
https://github.com/golang/go/issues/15333#issuecomment-210842761
This CL removes the dial function instead and makes plan9's net
implementation respect contexts, which likely fixes a number of
t.Skipped tests. I'm leaving that to 0intro to investigate.
In the process of propagating and respecting contexts for plan9, I had
to change some signatures to add contexts to more places and ended up
pushing contexts down into the Go-based DNS resolution as well,
replacing the pure-Go DNS implementation's use of "timeout
time.Duration" with a context instead.
Updates #11932
Updates #15328
Fixes #15333
Change-Id: I6ad1e62f38271cdd86b3f40921f2d0f23374936a
Reviewed-on: https://go-review.googlesource.com/22144
Reviewed-by: David du Colombier <0intro@gmail.com>
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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LookupPort() correctly parses service names beginning with numerals by
implementing a new parser, mainly taken from strconv/atoi.go.
Also testes some previously undefined behaviours around port numbers
larger than 65535 that previously could lead to some tests fail with
EOPNOTSUPP (Operation Not Supported).
Fixes #14322
Change-Id: I1b90dbed434494723e261d84e73fe705e5c0507a
Reviewed-on: https://go-review.googlesource.com/19720
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
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For #12580 (http.Transport tracing/analytics)
Updates #13021
Change-Id: I126e494a7bd872e42c388ecb58499ecbf0f014cc
Reviewed-on: https://go-review.googlesource.com/22101
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
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The tree's pretty inconsistent about single space vs double space
after a period in documentation. Make it consistently a single space,
per earlier decisions. This means contributors won't be confused by
misleading precedence.
This CL doesn't use go/doc to parse. It only addresses // comments.
It was generated with:
$ perl -i -npe 's,^(\s*// .+[a-z]\.) +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.) +([A-Z])')
$ go test go/doc -update
Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7
Reviewed-on: https://go-review.googlesource.com/20022
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Day <djd@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This is a subset of https://golang.org/cl/20022 with only the copyright
header lines, so the next CL will be smaller and more reviewable.
Go policy has been single space after periods in comments for some time.
The copyright header template at:
https://golang.org/doc/contribute.html#copyright
also uses a single space.
Make them all consistent.
Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0
Reviewed-on: https://go-review.googlesource.com/20111
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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This reverts commit bb8c2e19a7fe2ca2283eca44dba2047c9f4307fe.
Change-Id: I9bc089e9f2296805ef055b98e8c86ba73af30226
Reviewed-on: https://go-review.googlesource.com/18439
Reviewed-by: Russ Cox <rsc@golang.org>
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Previously it depended on whether we were using the Go resolver or the Cgo resolver.
Fixes #12421.
Change-Id: Ib162e336f30f736d7244e29d96651c3be11fc3cd
Reviewed-on: https://go-review.googlesource.com/18383
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Fixes #13610
Change-Id: I9c8f924dc1ad515a9697291e981ece34fdbec8b7
Reviewed-on: https://go-review.googlesource.com/17755
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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This change makes Dial, Listen and ListenPacket with invalid port fail
whatever GODEBUG=netdns is.
Please be informed that cgoLookupPort with an out of range literal
number may return either the lower or upper bound value, 0 or 65535,
with no error on some platform.
Fixes #11715.
Change-Id: I43f9c4fb5526d1bf50b97698e0eb39d29fd74c35
Reviewed-on: https://go-review.googlesource.com/12447
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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This worked in Go 1.4 but was lost in the "pure Go" lookup
routines substituted late in the Go 1.5 cycle.
Fixes #12263.
Change-Id: I77ec9d97cd8e67ace99d6ac965e5bc16c151ba83
Reviewed-on: https://go-review.googlesource.com/13915
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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To date, the behavior has depended on whether we're using cgo and
in turn what the host resolver does. Most host resolvers will "resolve"
IP addresses, but the non-cgo pure Go path has not.
This CL makes resolution of IP addresses always work, even if we're not using cgo
and even if the host resolver does not "resolve" IP addresses.
Fixes #11335.
Change-Id: I19e82be968154d94904bb2f72e9c17893019a909
Reviewed-on: https://go-review.googlesource.com/11420
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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This change fixes inconsistent error values on
Lookup{Addr,CNAME,Host,IP.MX,NS,Port,SRV,TXT}.
Updates #4856.
Change-Id: I059bc8ffb96ee74dff8a8c4e8e6ae3e4a462a7ef
Reviewed-on: https://go-review.googlesource.com/9108
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Previously, running
$ go get -u -v golang.org/x/tools/cmd/godoc
would results in dozens of HTTP requests for
https://golang.org/x/tools?go-get=1
once per package under x/tools.
Now it caches the results. We still end up doing one HTTP request for
all the packages under x/tools, but this reduces the total number of
HTTP requests in ~half.
This also moves the singleflight package back into an internal
package. singleflight was originally elsewhere as a package, then got
copied into "net" (without its tests). But now that we have internal,
put it in its own package, and restore its test.
Fixes #9249
Change-Id: Ieb5cf04fc4d0a0c188cb957efdc7ea3068c34e3f
Reviewed-on: https://go-review.googlesource.com/8727
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
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This change adds testHookLookIP to enable to inject DNS name to IP
address mappings for Happ{y,yish,ier} Eyeballs dial testing.
Change-Id: I8ac04a594e1e2bd77909528df0552889914a7790
Reviewed-on: https://go-review.googlesource.com/8399
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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The unix and windows getaddrinfo calls return a zone with IPv6
addresses. IPv6 link-local addresses returned are only valid on the
given zone. When the zone is dropped, connections to the address
will fail. This patch replaces IP with IPAddr in several internal
resolver functions, and plumbs through the zone.
Change-Id: Ifea891654f586f15b76988464f82e04a42ccff6d
Reviewed-on: https://go-review.googlesource.com/5851
Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>
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Before this CL, if the system resolver does a very slow DNS
lookup for a particular host, all subsequent requests for that
host will hang waiting for that lookup to complete. That is
more or less expected when Dial is called with no deadline.
When Dial has a deadline, though, we can accumulate a large
number of goroutines waiting for that slow DNS lookup. Try to
avoid this problem by restarting the DNS lookup when it is
redone after a deadline is passed.
This CL also avoids creating an extra goroutine purely to
handle the deadline.
No test because we would have to simulate a slow DNS lookup
followed by a fast DNS lookup.
Fixes #8602.
LGTM=bradfitz
R=bradfitz, mikioh.mikioh
CC=golang-codereviews, r, rsc
https://golang.org/cl/154610044
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Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
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