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-rw-r--r--lib/libc/gen/initgroups.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/libc/gen/initgroups.c b/lib/libc/gen/initgroups.c
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index 000000000000..a1a7d92250e2
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+++ b/lib/libc/gen/initgroups.c
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+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1983, 1993
+ * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 2025 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Olivier Certner
+ * <olce@FreeBSD.org> at Kumacom SARL under sponsorship from the FreeBSD
+ * Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* For __sym_compat(). */
+#include <sys/cdefs.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* For freebsd14_setgroups(). */
+#include "gen-compat.h"
+
+static int
+initgroups_impl(const char *uname, gid_t agroup,
+ int (*setgroups)(int, const gid_t *))
+{
+ gid_t *groups;
+ long ngroups_max;
+ int ngroups, ret;
+
+ /*
+ * Provide space for one group more than possible to allow setgroups()
+ * to fail and set 'errno' in case we get back more than {NGROUPS_MAX} +
+ * 1 groups.
+ */
+ ngroups_max = sysconf(_SC_NGROUPS_MAX) + 2;
+ groups = malloc(sizeof(*groups) * ngroups_max);
+ if (groups == NULL)
+ return (-1); /* malloc() set 'errno'. */
+
+ ngroups = (int)ngroups_max;
+ (void)getgrouplist(uname, agroup, groups, &ngroups);
+ ret = (*setgroups)(ngroups, groups);
+
+ free(groups);
+ return (ret); /* setgroups() set 'errno'. */
+}
+
+int
+initgroups(const char *uname, gid_t agroup)
+{
+ return (initgroups_impl(uname, agroup, setgroups));
+}
+
+int
+freebsd14_initgroups(const char *uname, gid_t agroup)
+{
+ return (initgroups_impl(uname, agroup, freebsd14_setgroups));
+}
+
+__sym_compat(initgroups, freebsd14_initgroups, FBSD_1.0);