/**
 * Test case for spurious DNS A requests triggered by getaddrinfo()
 *
 * An issue was found ( ref. BZ #14307 http://sourceware.org/bugzilla/show_bug.cgi?id=14307 )
 * which causes getaddrinfo() to send duplicate DNS requests for certain hostnames on x86_64 
 * hosts
 *
 * This self-contained program illustrates one such case: www.google.com
 *
 * The issue is due to a relatively small (512 bytes) temporary buffer allocated in 
 * sysdeps/posix/getaddrinfo.c which is largely used up by a struct, the size of which varies 
 * for x86 (208 bytes) and x86_64 (400 bytes) - which explains why this issue occurs
 * less frequently for x86
 *
 * Authors: Siddhesh Poyarekar <siddhesh@redhat.com>, Jeroen van Bemmel <jbemmel@zonnet.nl>
 */
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>

int main()
{
        const char *host = "www.gmail.com";
        struct addrinfo hints;
        struct addrinfo *result = NULL, *rp;
        int err = 0;

        memset(&hints, 0, sizeof(struct addrinfo));

        hints.ai_family = AF_INET;
        hints.ai_socktype = SOCK_STREAM;
        // hints.ai_flags = AI_CANONNAME;

        if ((err = getaddrinfo(host, NULL, &hints, &result)) < 0) {
                fprintf(stderr, "Lookup: unable to create socket for %s:%s:: \n",
                        host, port, gai_strerror(err));
                return 1;
        }
}