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syscall: missing SYS_GETSOCKOPT in zsysnum_linux_386.go #19043

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riobard opened this issue Feb 12, 2017 · 4 comments
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syscall: missing SYS_GETSOCKOPT in zsysnum_linux_386.go #19043

riobard opened this issue Feb 12, 2017 · 4 comments

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@riobard
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@riobard riobard commented Feb 12, 2017

Please answer these questions before submitting your issue. Thanks!

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

1.7.5

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

Darwin/amd64

What did you do?

If possible, provide a recipe for reproducing the error.

GOOS=linux GOARCH=386 go doc syscall.SYS_GETSOCKOPT

What did you expect to see?

List of defined constants containing SYS_GETSOCKOPT.

What did you see instead?

doc: no symbol SYS_GETSOCKOPT in package syscall
@minux
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@minux minux commented Feb 12, 2017

@minux minux closed this Feb 12, 2017
@riobard
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@riobard riobard commented Feb 12, 2017

Thanks a lot for the explanation. In that case, how to implement Getsockopt* for structs not implemented in syscall or unix? The following code works on linux_amd64. I'd like to know a way to do that on linux_386 as well.

// Call getorigdst() from linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
func getorigdst(fd uintptr) (*syscall.RawSockaddrInet4, error) {
	const SO_ORIGINAL_DST = 80 // from linux/include/uapi/linux/netfilter_ipv4.h
	raw := syscall.RawSockaddrInet4{}
	siz := unsafe.Sizeof(raw)
	if _, _, errno := syscall.Syscall6(syscall.SYS_GETSOCKOPT, fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST, uintptr(unsafe.Pointer(&raw)), uintptr(unsafe.Pointer(&siz)), 0); errno != 0 {
		return nil, errno
	}
	return raw, nil
}
@ianlancetaylor
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@ianlancetaylor ianlancetaylor commented Feb 13, 2017

Questions are best directed to a forum, rather than the issue tracker; see https://golang.org/wiki/Questions.

On 386 GNU/Linux you'll need to call something along the lines of Syscall6(syscall.SYS_SOCKETCALL, 15, /* setsockopt arguments */).

@riobard
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@riobard riobard commented Feb 13, 2017

Thanks a lot for the pointer! :)

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