gai_bug.c

gai_bug.c (text/plain), 824 bytes, created by Hans Nieser on 2011-03-15 13:41:23 UTC

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>

int main(int argc, char **argv)
{
    struct addrinfo hints, *result, *ai;

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

    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags |= AI_PASSIVE;
    hints.ai_flags |= AI_ADDRCONFIG;

    if (getaddrinfo(NULL, argv[1], &hints, &result))
    {
        printf("failed to get addresses\n");
        exit(EXIT_FAILURE);
    }

    for (ai = result; ai != NULL; ai = ai->ai_next)
    {
        if (ai->ai_family == AF_INET)
            printf("this is an IPv4 result\n");
        else if(ai->ai_family == AF_INET6)
            printf("this is an IPv6 result\n");
        else
            printf("eww what's this?\n");
    }

    freeaddrinfo(result);
}