Re: broken IPv6 code

[Brian May <bam@debian.org>]

>>>>> "yoshfuji" == yoshfuji  <YOSHIFUJI> writes:

    yoshfuji> No, it is not standard.  In fact, there're NO standards.

    yoshfuji> On RFC 2553 compliance systems, ipv4 communication
    yoshfuji> should go to ipv6 socket in ipv4-mapped manner.
    yoshfuji> However, bind(2) behavior is not specified, and is
    yoshfuji> different between systems, such as NetBSD, FreeBSD,
    yoshfuji> Linux and Solaris.  Situation is very complicated and
    yoshfuji> server application must be coded carefully.

This would seem to be a bad situation, and makes writing portable code
impossible.

Then again, what is the correct way of doing this on Linux?

<URL:http://people.debian.org/~csmall/ipv6/> has a link to
<URL:http://www.kame.net/newsletter/19980604/> which has a
very similar looking loop to Heimdal:

Heimdal code:

memset (&hints, 0, sizeof(hints));
hints.ai_flags    = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;

error = getaddrinfo (NULL, portstr, &hints, &ai);
[...]
for (i = 0, a = ai; a != NULL; a = a->ai_next) {
  fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
  [...]
  socket_set_reuseaddr (fds[i], 1);
  [...]
  bind (fds[i], a->ai_addr, a->ai_addrlen);
  [...]
  listen (fds[i], SOMAXCONN);
  [...]
}

webpage code:

        struct addrinfo hints;
        struct addrinfo *res;
        char *myservice;

        memset(&hints, 0, sizeof(hints));
        /* set-up hints structure */
        hints.ai_family = PF_UNSPEC;
        hints.ai_flags = AI_PASSIVE;
        hints.ai_socktype = SOCK_STREAM;
        error = getaddrinfo(NULL, myservice, &hints, &res);
        if (error)
                perror(gai_strerror(error));
        else {
                /*
                 * "res" has a chain of addrinfo structure filled with
                 * 0.0.0.0 (for IPv4), 0:0:0:0:0:0:0:0 (for IPv6) and alike,
                 * with port filled for "myservice".
                 */
                while (res) {
                        /* bind() and listen() to res->ai_addr */
                }
        }

Is this wrong? If it is, then perhaps the link to the bad web page
should be removed?
-- 
Brian May <bam@debian.org>