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-rw-r--r--lib/util/gethostname.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/util/gethostname.c b/lib/util/gethostname.c
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+/*
+ * 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;
+}