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net: interface tests fail with multiple prefixes from IPv4 loopback address block #23903

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rasky opened this issue Feb 18, 2018 · 2 comments
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net: interface tests fail with multiple prefixes from IPv4 loopback address block #23903

rasky opened this issue Feb 18, 2018 · 2 comments
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Go1.11

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@rasky
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rasky commented Feb 18, 2018

What version of Go are you using (go version)?

Go 1.10.

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/rasky/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/rasky/Sources/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.10rc2/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.10rc2/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/q5/4h90rf793dz456wy2tmfl7_80000gn/T/go-build815831965=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Tried to run all.bash to run all tests.

What did you expect to see?

All tests passed.

What did you see instead?

=== RUN   TestInterfaceAddrs
--- FAIL: TestInterfaceAddrs (0.00s)
	interface_test.go:94: unexpected prefix length: 24/32 for &net.IPNet{IP:net.IP{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0x7f, 0x0, 0x0, 0x36}, Mask:net.IPMask{0xff, 0xff, 0xff, 0x0}}
=== RUN   TestInterfaceUnicastAddrs
--- FAIL: TestInterfaceUnicastAddrs (0.00s)
	interface_test.go:118: {1 16384 lo0  up|loopback|multicast} unexpected prefix length: 24/32 for &net.IPNet{IP:net.IP{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0x7f, 0x0, 0x0, 0x36}, Mask:net.IPMask{0xff, 0xff, 0xff, 0x0}}
=== RUN   TestInterfaceMulticastAddrs
--- FAIL: TestInterfaceMulticastAddrs (0.00s)
	interface_test.go:140: unexpected prefix length: 24/32 for &net.IPNet{IP:net.IP{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0x7f, 0x0, 0x0, 0x36}, Mask:net.IPMask{0xff, 0xff, 0xff, 0x0}}

It looks like the problem is that I have a loopback interface with netmask /24 on my system. This is the output of netstat -nr:

Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            192.168.1.1        UGSc          153        0     en0
127                127.0.0.1          UCS             0        0     lo0
127.0.0.1          127.0.0.1          UH              1  2986383     lo0
127.0.0.54         127.0.0.54         UH              3      808     lo0

I traced this to dnscrypt-osx-client, a software that wraps dns-crypt, the DNS-encryption protocol supported by OpenDNS servers. This is where the interface is created:

https://github.com/stammy/dnscrypt-osx-client/blob/69fdd9c44cc7e19c05608cfd463e55829de43416/DNSCrypt-Preference-Pane/DNSCrypt/extra/usr/scripts/common.inc#L62

I don't know if this violates some RFC requirements, but I don't think all.bash should fail in this situation.
@rasky rasky added OS-Darwin NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Feb 18, 2018
@rasky rasky changed the title net: interface_test faille on OSX after installing dnscrypt net: interface_test fail on OSX after installing dnscrypt Feb 18, 2018
@rasky rasky changed the title net: interface_test fail on OSX after installing dnscrypt net: interface_test fails on OSX after installing dnscrypt Feb 18, 2018
@mikioh
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mikioh commented Feb 20, 2018 •
edited

It's fine to use any block from 127/8 as your system's loopback operation. Let's loosen the existing grave test cases.

@mikioh mikioh changed the title net: interface_test fails on OSX after installing dnscrypt net: interface tests fail with multiple prefixes from IPv4 loopback address block Feb 20, 2018
@mikioh mikioh removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Darwin labels Feb 20, 2018
@mikioh mikioh added this to the Go1.11 milestone Feb 20, 2018
@gopherbot
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Change https://golang.org/cl/95336 mentions this issue: net: adjust the test for IPv4 loopback address block

@golang golang locked and limited conversation to collaborators Feb 20, 2019
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