source: mainline/uspace/app/dnsres/dnsres.c@ c55cbbf

/*
 * Copyright (c) 2013 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup dnsres
 * @{
 */
/** @file DNS query utility.
 */

#include <errno.h>
#include <inet/dnsr.h>
#include <stdio.h>
#include <stdlib.h>

#define NAME "dnsres"

static void print_syntax(void)
{
        printf("syntax: " NAME " <host-name>\n");
}

static int addr_format(inet_addr_t *addr, char **bufp)
{
        int rc;

        rc = asprintf(bufp, "%d.%d.%d.%d", addr->ipv4 >> 24,
            (addr->ipv4 >> 16) & 0xff, (addr->ipv4 >> 8) & 0xff,
            addr->ipv4 & 0xff);

        if (rc < 0)
                return ENOMEM;

        return EOK;
}

int main(int argc, char *argv[])
{
        int rc;
        dnsr_hostinfo_t *hinfo;
        char *saddr;

        rc = dnsr_init();
        if (rc != EOK) {
                printf(NAME ": Failed connecting to DNS resolution service "
                    "(%d).\n", rc);
                return 1;
        }

        if (argc != 2) {
                print_syntax();
                return 1;
        }

        rc = dnsr_name2host(argv[1], &hinfo);
        if (rc != EOK) {
                printf(NAME ": Error resolving '%s'.\n", argv[1]);
                return 1;
        }

        rc = addr_format(&hinfo->addr, &saddr);
        if (rc != EOK) {
                dnsr_hostinfo_destroy(hinfo);
                printf(NAME ": Out of memory.\n");
                return 1;
        }

        printf("Host name: %s address: %s\n", hinfo->name, saddr);
        dnsr_hostinfo_destroy(hinfo);
        free(saddr);

        return 0;
}

/** @}
 */