busybox

/* vi: set sw=4 ts=4: */

/*

 * Mini nslookup implementation for busybox

 *

 * Copyright (C) 1999,2000 by Lineo, inc. and John Beppu

 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>

 *

 * Correct default name server display and explicit name server option

 * added by Ben Zeckel <bzeckel@hmc.edu> June 2001

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 */

​

#include <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

​

#include <stdint.h>

#include <netdb.h>

#include <sys/socket.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <resolv.h>

#include <arpa/inet.h>

#include "busybox.h"

​

/*

 |  I'm only implementing non-interactive mode;

 |  I totally forgot nslookup even had an interactive mode.

 */

​

/* only works for IPv4 */

static int addr_fprint(char *addr)

{

    uint8_t split[4];

    uint32_t ip;

    uint32_t *x = (uint32_t *) addr;

​

    ip = ntohl(*x);

    split[0] = (ip & 0xff000000) >> 24;

    split[1] = (ip & 0x00ff0000) >> 16;

    split[2] = (ip & 0x0000ff00) >> 8;

    split[3] = (ip & 0x000000ff);

    printf("%d.%d.%d.%d", split[0], split[1], split[2], split[3]);

    return 0;

}

​

/* takes the NULL-terminated array h_addr_list, and