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x/net/ipv4: wrong endianness in IP header on darwin-amd64 #32118

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hrqiang opened this issue May 17, 2019 · 3 comments

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@hrqiang
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commented May 17, 2019

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

$ go version
go version go1.11.5 darwin/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
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/rhuang/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/rhuang/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.11.5/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.11.5/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/xy/qpsgj2816g97b0ctzkq0ps_r0000gs/T/go-build097375093=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

marshall IPv4 IP header with x/net/ipv4/header, but I got little-endian instead of big-endian.

What did you expect to see?

Got big-endian IP header len.

What did you see instead?

little-endian

Looking at By looking at the code https://github.com/golang/net/blob/master/ipv4/header.go#L71., for darwin, 32bit/64bit os should have a different conversion.
Darwin amd64 is little-endian, it should convert.

@bradfitz bradfitz changed the title Wrong endianness for osx 64bit(little endian) on IP header. x/net/ipv4: wrong endianness in IP header on darwin-amd64 May 17, 2019

@gopherbot gopherbot added this to the Unreleased milestone May 17, 2019

@bradfitz

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commented May 17, 2019

/cc @mikioh

@ianlancetaylor

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commented May 17, 2019

Can you show us a self-contained program we can use to recreate the problem?

@hrqiang

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commented May 18, 2019

@ianlancetaylor this is the program to recreate the issue. https://github.com/hrqiang/iphdr/blob/master/iphdr.go

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