net: ListenIP doesn't support Linux-specific ICMP echo-only socket

[fxkr]

I want to open a ping socket, but I can't because
`net.ListenIP("ip4:icmp", ...)`[1] always uses type=SOCK_RAW. However,
for "ip4:icmp" / "ip6:ipv6-icmp" it should use type=SOCK_DGRAM.

I also can't work around it by using `net.ListenUDP` because that
always uses proto=0 (= default = UDP for SOCK_DGRAM). 

[1] https://code.google.com/p/go/source/browse/src/net/iprawsock_posix.go

[mikioh]

Comment 1:

Thanks but no thanks. it's a protocol stack inside Linux kernel specific feature, also
it cannot receive/send other ICMP type messages. You can make your Linux+ICMP
echo-specific socket using syscall.Socket and make it run with runtime-integrated
network poller by using net.FilePacketConn.

Labels changed: added repo-main.

Status changed to Unfortunate.

[mikioh]

Comment 2:

> You can make your Linux+ICMP echo-specific socket...
if it doesn't work well, please open a new issue.

[mikioh]

Comment 3:

> if it doesn't work well, please open a new issue.
fyi: it works well. see attached.

Attachments:

1. pingsock.go (1664 bytes)

[fxkr]

Comment 4:

Ok, thanks!

[gopherbot]

Comment 5:

CL https://golang.org/cl/182110043 mentions this issue.

[mikioh]

Comment 6:

This issue was updated by revision golang/net@fc168c3.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/182110043

[mikioh]

Comment 7:

fwiw, now golang.org/x/net/icmp supports non-privileged datagram-oriented icmp socket.
see http://godoc.org/golang.org/x/net/icmp for further information.