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405070d482
These convenience functions cache the value and handle any potenial errors from sysconf().
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2015, 2025 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sudo_compat.h>
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#include <sudo_util.h>
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/*
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* Return a malloc()ed copy of the system hostname, or NULL if
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* malloc() or gethostname() fails.
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*/
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char *
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sudo_gethostname_v1(void)
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{
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const size_t host_name_max = sudo_host_name_max();
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char *hname = malloc(host_name_max + 1);
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if (hname != NULL) {
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if (gethostname(hname, host_name_max + 1) == 0 && *hname != '\0') {
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/* Old gethostname() may not NUL-terminate if there is no room. */
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hname[host_name_max] = '\0';
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} else {
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free(hname);
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hname = NULL;
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}
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}
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return hname;
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}
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size_t
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sudo_host_name_max_v1(void)
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{
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static size_t maxval;
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if (maxval == 0) {
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long lval;
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#ifdef _SC_HOST_NAME_MAX
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lval = sysconf(_SC_HOST_NAME_MAX);
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if (lval <= 0)
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#endif
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lval = 255; /* POSIX and historic BSD */
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maxval = (size_t)lval;
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}
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return maxval;
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}
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