diff options
Diffstat (limited to '')
-rw-r--r-- | lib/util/gethostname.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/util/gethostname.c b/lib/util/gethostname.c new file mode 100644 index 0000000..34f714b --- /dev/null +++ b/lib/util/gethostname.c @@ -0,0 +1,59 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2015 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) +{ + char *hname; + size_t host_name_max; + +#ifdef _SC_HOST_NAME_MAX + host_name_max = (size_t)sysconf(_SC_HOST_NAME_MAX); + if (host_name_max == (size_t)-1) +#endif + host_name_max = 255; /* POSIX and historic BSD */ + + 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; +} |