/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2015, 2025 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include <config.h>

#include <stdlib.h>

#include <unistd.h>

#include <sudo_compat.h>

#include <sudo_util.h>

/*

 * Return a malloc()ed copy of the system hostname, or NULL if 

 * malloc() or gethostname() fails.

 */

char *

sudo_gethostname_v1(void)

{

    const size_t host_name_max = sudo_host_name_max();

    char *hname = malloc(host_name_max + 1);

    if (hname != NULL) {

  if (gethostname(hname, host_name_max + 1) == 0 && *hname != '\0') {

      /* Old gethostname() may not NUL-terminate if there is no room. */

      hname[host_name_max] = '\0';

  } else {

      free(hname);

      hname = NULL;

  }

    }

    return hname;

}

size_t

sudo_host_name_max_v1(void)

{

    static size_t maxval;

    if (maxval == 0) {

  long lval;

#ifdef _SC_HOST_NAME_MAX

  lval = sysconf(_SC_HOST_NAME_MAX);

  if (lval <= 0)

#endif

      lval = 255; /* POSIX and historic BSD */

  maxval = (size_t)lval;

    }

    return maxval;

}