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/* Copyright 1998 by the Massachusetts Institute of Technology.
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
static const char rcsid[] = "$Id$";
#include <sys/types.h>
#ifdef WIN32
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ares.h"
#include "ares_dns.h"
#define INADDR_NONE 0xffffffff
static void callback(void *arg, int status, struct hostent *host);
static void usage(void);
int main(int argc, char **argv)
ares_channel channel;
int status, nfds;
fd_set read_fds, write_fds;
struct timeval *tvp, tv;
char *errmem;
struct in_addr addr;
#ifdef WIN32
WORD wVersionRequested = MAKEWORD(1,1);
WSADATA wsaData;
WSAStartup(wVersionRequested, &wsaData);
if (argc == 0)
status = ares_init(&channel);
if (status != ARES_SUCCESS)
fprintf(stderr, "ares_init: %s\n", ares_strerror(status, &errmem));
return 1;
/* Initiate the queries, one per command-line argument. */
for (argv++; *argv; argv++)
addr.s_addr = inet_addr(*argv);
if (addr.s_addr == INADDR_NONE)
ares_gethostbyname(channel, *argv, AF_INET, callback, *argv);
ares_gethostbyaddr(channel, &addr, sizeof(addr), AF_INET, callback,
/* Wait for all queries to complete. */
while (1)
nfds = ares_fds(channel, &read_fds, &write_fds);
if (nfds == 0)
tvp = ares_timeout(channel, NULL, &tv);
select(nfds, &read_fds, &write_fds, NULL, tvp);
ares_process(channel, &read_fds, &write_fds);
return 0;
static void callback(void *arg, int status, struct hostent *host)
struct in_addr addr;
char *mem, **p;
if (status != ARES_SUCCESS)
fprintf(stderr, "%s: %s\n", (char *) arg, ares_strerror(status, &mem));
for (p = host->h_addr_list; *p; p++)
memcpy(&addr, *p, sizeof(struct in_addr));
printf("%-32s\t%s\n", host->h_name, inet_ntoa(addr));
static void usage(void)
fprintf(stderr, "usage: ahost {host|addr} ...\n");