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/*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#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;
}
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