Date: Thu, 18 Mar 2004 14:05:23 +0100 From: Lukasz Stelmach <Lukasz.Stelmach@telmark.waw.pl> To: Hajimu UMEMOTO <ume@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: sockaddr_(in|in6) compatiblity Message-ID: <20040318130523.GA20949@tygrys.k.telmark.waw.pl> In-Reply-To: <ygen06pkgbh.wl%ume@FreeBSD.org> References: <20040309182857.GA818@tygrys.k.telmark.waw.pl> <ygen06pkgbh.wl%ume@FreeBSD.org>
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[-- Attachment #1 --] Byla godzina 03:48:02 w Wednesday 10 March, gdy do autobusu wsiadl kanar i wrzasnal:"Hajimu UMEMOTO!!! Bilecik do kontroli!!!" A on(a) na to: LS>> 1. I open socket AF_INET6/SOCK_DGRAM... OK LS>> 2. bind it to ::ffff:127.0.0.1/53... OK HU> Why do you use IPv4-mapped IPv6 address for binding IPv4? When you HU> wish to bind to IPv4, just use AF_INET socket. It is not me in fact who ueses it. I try to setup djbdns with IPv6 support. HU> This feature is disabled by default on 5-CURRENT. Can you tell me (or give some article to read) why? I am curious because i think this is quite good for a programmer to use one type of socket and the same set of structures for both protocols, especially now when IPv6 just starts its go. LS>> 3. recvfrom() data from the socket... OK LS>> 4. *from (the 5th parameter to recvfrom) gets filled in like it was LS>> a sockaddr_in (ipv4) structure [...] HU> Use getnameinfo(3). You shouldn't need to use inet_ntop(3). Welcome HU> to an address family independent programming with getaddrinfo(3) and HU> getnameinfo(3). In fact it is not the matter of inet_ntop(3) but the way the djbdns patch seems to work. get*info(3) won't do the thing since to get the address from sockaddr structure (after recvfrom) i still need to check the family field and do proper cast. IMHO it would be much more logical that if I open AF_INET6 socket (even v4 mapped) i *always* get sockaddr_in6 structure and need not to cast it to sockaddr_in. Best regards, -- |/ |_, _ .- --, Już z każdej strony pełzną, potworne żądze |__ |_|. | \ |_|. ._' /_. Będę uprawiał nierząd, za pieniąze [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQFAWZ6TNdzY8sm9K9wRAv3eAJwLEEfnsUTG09RV0+qhaqXoAmiLdQCffB+a ee5cna/DXhiv5FF9f2v/XcI= =Y8vJ -----END PGP SIGNATURE-----help
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