From: merch-redmine@...
Date: 2020-06-02T17:13:49+00:00
Subject: [ruby-core:98627] [Ruby master Feature#10911] IPAddr.new should	ignore zone identifiers

Issue #10911 has been updated by jeremyevans0 (Jeremy Evans).


jeremyevans0 (Jeremy Evans) wrote in #note-4:
> Dan0042 (Daniel DeLorme) wrote:
> > So "fe80::1%fxp0" is not even recognized as an IP address. This could result in unpleasantness in cases like this:
> > 
> > ```ruby
> > str = "fe80::1%fxp0"
> > ip = IPAddr.new(str) rescue nil   #validate IP address
> > TCPSocket.new(ip.to_s, 42) if ip  #and connect
> > ```
> 
> Good point.  We would probably want to fix socket to support this before adding support to ipaddr.

It turns out that the socket library already supports this, at least on my operating system (and I would guess other operating systems supporting IPv6 zone identifiers).  If I get the IPv6 loopback address with the zone identifier, and use `nc` to create a listening socket:

```
$ ifconfig lo0 | fgrep fe80
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
$ nc -l fe80::1%lo0 1042
```

I can use that address with Ruby to write to it, as well as get the addrinfo:

```ruby
require 'socket'
t = TCPSocket.new("fe80::1%lo0", 1042)
t.write("foo\n")
t.close

Socket.getaddrinfo("fe80::1%lo0", nil)
# => [["AF_INET6", 0, "fe80::1%lo0", "fe80::1%lo0", 24, 2, 17], ["AF_INET6", 0, "fe80::1%lo0", "fe80::1%lo0", 24, 1, 6]]
```

And `foo` gets printed to the stdout of the `nc` process. I've tested and this works back to Ruby 1.8.

So I don't think we need changes to socket, and I think it we should apply the patch to ipaddr (it still applies without conflicts).

----------------------------------------
Feature #10911: IPAddr.new should ignore zone identifiers
https://bugs.ruby-lang.org/issues/10911#change-85951

* Author: postmodern (Hal Brodigan)
* Status: Assigned
* Priority: Normal
* Assignee: knu (Akinori MUSHA)
----------------------------------------
Link local IPv6 addresses may have a zone identifier suffix:

    fe80::1%lo0

IPAddr.new currently does not ignore the zone identifier and raises IPAddr::InvalidAddressError.

---Files--------------------------------
ipaddr-ipv6-zone-id-10911.patch (5.17 KB)


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