Milter-greylist

Jim Klimov <jimklimov@...> wrote:

> Okay, so here goes the third version of the un-bracketer :)

I was reading it and it seemed a bit overkill to me to do the 
a.b.c.d -> d.c.b.a.in-addr.arpa transformation on your own. That adds
many lines and still fail to support IPv6. Is your system able to use
getnameinfo(), which is part of POSIX1?

Here is a sample proram to test, with both IPv4 or IPv6 addresses. It
even works if you supply a DNS address.

#include <stdio.h>
#include <err.h>
#include <sysexits.h>
#include <netdb.h>

int
main(argc, argv)
        int argc;
        char **argv;
{
        char *addr;
        struct addrinfo *res;
        char hbuf[NI_MAXHOST];
        int rc;

        if (argc != 2)
                errx(EX_USAGE, "%s IP", argv[0]);

        addr = argv[1];

        rc = getaddrinfo(addr, NULL, NULL, &res);
        if (rc != 0)
                errx(EX_OSERR, "failed parsing %s: %s", 
                     addr, gai_strerror(rc));           
           
        rc = getnameinfo(res->ai_addr, res->ai_addrlen,
                         hbuf, sizeof(hbuf), NULL, 0, NI_NAMEREQD);
        if (rc != 0)
                errx(EX_OSERR, "failed resolving %s: %s", 
                     addr, gai_strerror(rc));           

        freeaddrinfo(res);

        printf("%s => %s\n", addr, hbuf);

        return 0;
}


-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu@...