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lib/util/gethostname.c
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Todd C. Miller
Remove Open Source PVS-Studio comments
28 сен 2025, 18:40
28 сен 2025, 18:40
2a33699
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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. */ #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; }