// taken from http://forums.mozillazine.org/viewtopic.php?f=38&t=84574&p=638331
// compile with gcc addrconfig.c -o addrconfig.so -shared -ldl -nostartfiles -fpic
// put /path/to/addrconfig.so in /etc/ld.so.preload
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#define __USE_GNU
#include <dlfcn.h>
#include <errno.h>

int (*real_getaddrinfo)(const char *, const char *, const struct addrinfo *, struct addrinfo **);

void _init (void)
{
	const char *err;

	real_getaddrinfo = dlsym (RTLD_NEXT, "getaddrinfo");
	if ((err = dlerror ()) != NULL)
		fprintf (stderr, "dlsym (getaddrinfo): %s\n", err);
}

int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res)
{
	struct addrinfo newhints;
	memcpy (&newhints, hints, sizeof (struct addrinfo));
	newhints.ai_flags |= AI_ADDRCONFIG;
	int retval = real_getaddrinfo(node, service, &newhints, res);
	return retval;
}