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net: Listen{,Packet,TCP,UDP,MulticastUDP,IP} can't bind to 255.255.255.255 #28798

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Alan-Jowett opened this issue Nov 14, 2018 · 2 comments

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@Alan-Jowett
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commented Nov 14, 2018

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

go version go1.10.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/alan/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/alan/go"
GORACE=""
GOROOT="/usr/lib/go-1.10"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.10/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
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 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build812735178=/tmp/go-build -gno-record-gcc-switches"

What did you do?

lAddr, err := net.ResolveUDPAddr("udp", "255.255.255.255:48899")
if err != nil {
    log.Fatal(err)
}

_, err = net.ListenMulticastUDP("udp", nil, lAddr)
if err != nil {
    log.Fatal(err)
}

repro.go.txt

What did you expect to see?

net.ListenMulticastUDP succeeds

What did you see instead?

2018/11/14 11:44:40 listen udp 255.255.255.255:48899: bind: cannot assign requested address
exit status 1

@Alan-Jowett

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commented Nov 14, 2018

User error. Issue is broadcast is not the same a multi-cast.

@mikioh mikioh changed the title ListenMulticastUDP can't bind to 255.255.255.255 net: Listen{,Packet,MulticastUDP} can't bind to 255.255.255.255 Nov 15, 2018

@mikioh

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commented Nov 15, 2018

broadcast is not the same a multi-cast.

The syscall bind just books a protocol control block for the argument, and almost all the implementations (especially kernels have SO_BROADCAST-like options) will reject the booking with an IPv4 limited, or directed broadcast address because it connotes some ambiguity on IP packet routing.

@mikioh mikioh changed the title net: Listen{,Packet,MulticastUDP} can't bind to 255.255.255.255 net: Listen{,Packet,TCP,UDP,MulticastUDP,IP} can't bind to 255.255.255.255 Nov 21, 2018

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