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Date: Thu, 12 Jul 2012 21:01:50 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
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In-Reply-To: <80BE761E-42B1-4111-ACEC-0C31E43D105D@lafn.org>
Subject: Re: IPv6 && getaddrinfo(3C)
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> From: Doug Hardie <bc979@lafn.org>
> Date: Thu, 12 Jul 2012 14:21:38 -0700
> Subject: Re: IPv6 && getaddrinfo(3C)
>
> On 12 July 2012, at 07:24, Matthias Apitz wrote:
>
> > Hello,
> >
> > I'm playing around with IPv6 code on a FreeBSD 9 system and can't get 
> > getaddrinfo(3C) to do what it should do as stated in its man page: 
> > accept an IPv6 and IPv4 IP addr, it only works with the IPv6 form:
> >
> > $ ./a.out ::1
> > host: ::1 read: SSH-2.0-OpenSSH_5.6p1 FreeBSD-20101111
> > $ ./a.out 127.0.0.1
> > host: 127.0.0.1 ssh: getaddrinfo failed code 8: hostname nor servname 
> > provided, or not known
> > $ telnet 127.0.0.1 22
> > Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 
> > SSH-2.0-OpenSSH_5.6p1 FreeBSD-20101111
> >
> > the used C-code is attached below; what I'm doing wrong in the code?
> >
> > Thanks
> >
> >  matthias
> >
> > /* IPv6 client code using getaddrinfo */
> >
> > #include <stdlib.h>
> > #include <sys/types.h>
> > #include <sys/socket.h>
> > #include <netinet/in.h>
> > #include <stdio.h>
> > #include <netdb.h>
> > #include <string.h>
> >
> >
> > main(argc, argv)		/* client side */
> >  int		argc; char           *argv[];
> > {
> >
> >  struct addrinfo	req, *ans; int	code, s, n; char buf[1024];
> >
> >  memset(&req, 0, sizeof(req));
> >  req.ai_flags = AI_ADDRCONFIG|AI_NUMERICHOST; 
> >  req.ai_family = AF_INET6;	/* Same as AF_INET6. */ 

Isn't the setting of 'req.ai_family', above, going to guarantee that
something that "looks like"  an IPv4 address will not be considered valid?

After all, what *POSSIBLE* _IPv6_info_ is there about an IPv4 address?

Per the manpage example, try PF_UNSPEC.