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net: Resolver.LookupNetIP strips IPv6 zone from resolved addresses #81601
Description
Go version
go version go1.27.1-X:nodwarf5 linux/amd64
Output of go env in your module/workspace:
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE=''
GOAMD64='v3'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN='/home/database64128/go/bin'
GOCACHE='/home/database64128/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/database64128/.config/go/env'
GOEXE=''
GOEXPERIMENT='nodwarf5'
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1790460134=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='/home/database64128/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPACKAGESDRIVER=''
GOPATH='/home/database64128/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/lib/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='on'
GOTELEMETRYDIR='/home/database64128/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='local'
GOTOOLDIR='/usr/lib/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.27.1-X:nodwarf5'
GOWORK=''
PKG_CONFIG='pkg-config'What did you do?
Call net.Resolver.LookupNetIP to resolve a .local mDNS hostname.
What did you see happen?
The returned IP addresses include link-local IPv6 addresses without the zone identifier.
What did you expect to see?
The IPv6 link-local addresses have the correct zone identifier, as returned by the cgo resolver.
This is a simple fix. Sending a CL.
Update: mailed CL 835285
Activity
gopherbot commentedon Sep 18, 2026
Change https://go.dev/cl/835285 mentions this issue:
net: preserve IPv6 zone in Resolver.LookupNetIPcherrymui commentedon Sep 18, 2026
cc @ianlancetaylor @neild @nicholashusin
gabyhelp commentedon Sep 19, 2026
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