Implement getpeereid(3), a front-end to the LOCAL_PEERCRED

socket option for the Unix domain.  It's weaker than the
socket option (this only returns the uid and gid, while the
socket opt. can return the entire group list), and is
implemented mostly for compatibility with OpenBSD.

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/libc/gen/getpeereid.c b/lib/libc/gen/getpeereid.c
new file mode 100644
index 0000000..bd070db
--- /dev/null
+++ b/lib/libc/gen/getpeereid.c
@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#if defined(LIBC_RCS) && !defined(lint)
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* LIBC_RCS and not lint */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/ucred.h>
+#include <sys/un.h>
+
+#include <unistd.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, LOCAL_PEERCRED, 1, &xuc, &xuclen);
+	if (error != 0)
+		return (error);
+	*euid = xuc.cr_uid;
+	*egid = xuc.cr_gid;
+	return (0);
+}