1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libc/gen/getpeereid.c b/lib/libc/gen/getpeereid.c
new file mode 100644
index 000000000000..444dd2664cc4
--- /dev/null
+++ b/lib/libc/gen/getpeereid.c
@@ -0,0 +1,57 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2001 Dima Dorfman.
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/ucred.h>
+#include <sys/un.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include "un-namespace.h"
+
+int
+getpeereid(int s, uid_t *euid, gid_t *egid)
+{
+	struct xucred xuc;
+	socklen_t xuclen;
+	int error;
+
+	xuclen = sizeof(xuc);
+	error = _getsockopt(s, SOL_LOCAL, LOCAL_PEERCRED, &xuc, &xuclen);
+	if (error != 0)
+		return (error);
+	if (xuc.cr_version != XUCRED_VERSION) {
+		errno = EINVAL;
+		return (-1);
+	}
+	*euid = xuc.cr_uid;
+	*egid = xuc.cr_gid;
+	return (0);
+}