Operation not permitted

[fenimore]

Hi, I'm trying to use this library for sending some ARP requests, and I get an

operation not permitted

error when I try to create a client. I'm getting the interfacing, passing it's pointer to the NewClient method. like so:

ifaces, _ := net.Interfaces()
// The third for me is the relevant one.
client, err := arp.NewClient(&ifaces[2])
if err != nil {
    fmt.Println(err)
}

target := net.ParseIP("10.0.18.70")
err = client.Request(target)
if err != nil {
    fmt.Println(err)
}

So I then get a nil error when I call client.Request, because the original client is not permitted. Is this the correct way to proceed? Should I be using sudo? When I do that it complains that the GOPATH isn't set, and things get tricky.

[mdlayher]

Yep, raw sockets require root permissions, or the CAP_NET_RAW capability (see man 7 capabilities).

It sounds like you're trying to use go run instead of go build? go build the binary as your user and then use sudo or set the capability on it to run it.

[fenimore]

Thanks! This is it, now I'm getting a no IPv4 address available for interface, but atleast I'm accessing it :), I can take it from here.

Just to be clear, the problem went away when building the binary and running it as sudo.