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POIPv6 with perl on windows not working
 

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  1. POIPv6 with perl on windows not working
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    <p>cross-post <a href="http://perlmonks.org/index.pl?node_id=984750" rel="nofollow noreferrer">http://perlmonks.org/index.pl?node_id=984750</a></p> <p>(Possible duplicate of <a href="https://stackoverflow.com/questions/11348206/perl-windows-ipv6">perl windows IPv6</a> ) I tried following sample example from : <a href="https://metacpan.org/module/IO::Socket::IP" rel="nofollow noreferrer">https://metacpan.org/module/IO::Socket::IP</a></p> <pre><code>use IO::Socket::IP -register; my $sock = IO::Socket-&gt;new( Domain =&gt; PF_INET6, LocalHost =&gt; "::1", Listen =&gt; 1, ) or die "Cannot create socket - $@\n"; print "Created a socket of type " . ref($sock) . "\n"; </code></pre> <p>It is giving output as : Cannot create socket - no address associated with nodename</p> <p>I am using ActiveState perl 5.14.2 and have built IO::Socket::IP module on it.</p> <p>Following is the ping result:</p> <pre><code>c:\&gt;ping ::1 Pinging ::1 with 32 bytes of data: Reply from ::1: time&lt;1ms Reply from ::1: time&lt;1ms Reply from ::1: time&lt;1ms Reply from ::1: time&lt;1ms Ping statistics for ::1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms </code></pre> <p>If I use the IPv4 style loopback address 127.0.0.1, the above code works well. I am wondering what I am missing.</p> <p>Update:</p> <p>I just cleaned the perl setup and path, and freshly installed perl 5.14.2 from <a href="http://www.activestate.com/activeperl/downloads" rel="nofollow noreferrer">http://www.activestate.com/activeperl/downloads</a></p> <p>and then I tried following simple code:</p> <pre><code>use strict; use warnings; use Socket qw(getaddrinfo SOCK_STREAM AI_PASSIVE ); my ( $err, @res ) = getaddrinfo( "::", 8086, { socktype =&gt; SOCK_STREAM, flags =&gt; AI_PASSIVE, } ); die $err if $err; </code></pre> <p>it ended with following error: no address associated with nodename at c:\IPv6.pl line 10.</p> <p>But with 127.0.0.1 it returns proper value.</p> <p>I am using windows 2008 R2 box, a same run on my another windows box also fails.</p> <p>I just tried to trace this call in Socket.pm, and found that a "fake_getaddrinfo" is getting called instead of the real getaddrinfo. It seems the XSLoader was either not able to find/load getaddrinfo from Socket.dll or Socket.dll didn't at all have the getaddrinfo. What could be the reason?</p> <p>A similar code below using Socket6 works properly on the same setup:</p> <pre><code>use Socket; use Socket6; @res = getaddrinfo('::', 8086, AF_UNSPEC, SOCK_STREAM); while(scalar(@res)&gt;=5){ ($family, $socktype, $proto, $saddr, $canonname, @res) = @res; ($host, $port) = getnameinfo($saddr, NI_NUMERICHOST | NI_NUMERICSERV); print ("\nhost= $host port = $port"); socket(Socket_Handle, $family, $socktype, $proto) || next; bind(Socket_Handle,$saddr ) || die "bind: $!"; listen(Socket_Handle, 5) || die "listen: $!"; ($host, $port) = getnameinfo($saddr, NI_NUMERICHOST | NI_NUMERICSERV); print ("\nReady for connections \nhost= $host port = $port"); $paddr = accept(Client, Socket_Handle); } </code></pre> <p>So I can't even blame the setup or the system dlls. Is there an issue with perl's built-in IPv6 support for windows' activestate build?</p>
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    1. COThe snippet works perfectly on Linux so this is probably a platform bug
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    2. COI suspect the code above is not initializing an ipv6 socket address structure with the scope_id and flowspec fields set correctly. In C code, the typical way to bind to ::1 is to call getifaddrs() and enumerate for the adapter with ::1 as IP or "lo" as the adapter name. Then use the ifaddrs->ifa_addr as the socket address to bind to. I have no idea if perl has a way to do this.
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    3. COHave you permitted this socket through windows firewall?
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      1. USMike Pennington
 

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