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net: Dial DNS lookups fail on Android #41373

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vinhjaxt opened this issue Sep 14, 2020 · 1 comment
Closed

net: Dial DNS lookups fail on Android #41373

vinhjaxt opened this issue Sep 14, 2020 · 1 comment
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FrozenDueToAge mobile Android, iOS, and x/mobile OS-Android

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

$ go version
go version go1.15.2 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/user/.cache/go-build"
GOENV="/home/user/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/user/data/go-vendor/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/user/data/go-vendor/"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/user/data/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/user/data/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build116565155=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Compile and run this file:

package main

import (
	"log"
	"net"
)

func main() {
	_, err := net.Dial("tcp", "echo.opera.com:80")
	log.Println(err)
}

GOOS=linux GOARCH=arm64 go build

What did you expect to see?

nil

What did you see instead?

dial tcp: lookup echo.opera.com on [::1]:53: read udp [::1]:55154->[::1]:53: read: connection refused

The root cause:

File ./go/src/net/dnsconfig_unix.go
Line: 19

var (
	defaultNS   = []string{"127.0.0.1:53", "[::1]:53"}
	getHostname = os.Hostname // variable for testing
)
@toothrot toothrot changed the title net.Dial fail on android net: net.Dial dns requests fail on Android Sep 15, 2020
@toothrot toothrot changed the title net: net.Dial dns requests fail on Android net: Dial dns requests fail on Android Sep 15, 2020
@toothrot toothrot changed the title net: Dial dns requests fail on Android net: Dial DNS lookups fail on Android Sep 15, 2020
@toothrot toothrot added mobile Android, iOS, and x/mobile OS-Android labels Sep 15, 2020
@toothrot
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Contributor

This would appear to be related to #10714 and is a duplicate of #8877. Please discuss there.

@golang golang locked and limited conversation to collaborators Sep 15, 2021
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@toothrot @gopherbot @vinhjaxt