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      1  1.4       nia /* $NetBSD: getpeereid.c,v 1.4 2021/08/08 20:54:48 nia Exp $ */
      2  1.1        he 
      3  1.1        he /*-
      4  1.1        he  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  1.1        he  * All rights reserved.
      6  1.1        he  *
      7  1.1        he  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1        he  * by Arne H. Juul.
      9  1.1        he  *
     10  1.1        he  * Redistribution and use in source and binary forms, with or without
     11  1.1        he  * modification, are permitted provided that the following conditions
     12  1.1        he  * are met:
     13  1.1        he  * 1. Redistributions of source code must retain the above copyright
     14  1.1        he  *    notice, this list of conditions and the following disclaimer.
     15  1.1        he  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1        he  *    notice, this list of conditions and the following disclaimer in the
     17  1.1        he  *    documentation and/or other materials provided with the distribution.
     18  1.1        he  *
     19  1.1        he  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1        he  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1        he  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1        he  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1        he  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1        he  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1        he  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1        he  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1        he  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1        he  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1        he  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1        he  */
     31  1.1        he 
     32  1.1        he #include <sys/cdefs.h>
     33  1.1        he #if defined(LIBC_SCCS) && !defined(lint)
     34  1.4       nia __RCSID("$NetBSD: getpeereid.c,v 1.4 2021/08/08 20:54:48 nia Exp $");
     35  1.1        he #endif /* LIBC_SCCS and not lint */
     36  1.1        he 
     37  1.1        he #include <sys/types.h>
     38  1.1        he #include <sys/un.h>
     39  1.1        he #include <sys/socket.h>
     40  1.3  christos #include <unistd.h>
     41  1.3  christos #include <errno.h>
     42  1.1        he 
     43  1.1        he 
     44  1.1        he int
     45  1.1        he getpeereid(int s, uid_t *euid, gid_t *egid)
     46  1.1        he {
     47  1.1        he 	struct unpcbid cred;
     48  1.3  christos 	struct sockaddr_storage ss;
     49  1.3  christos 	socklen_t len;
     50  1.3  christos 
     51  1.3  christos 	len = sizeof(ss);
     52  1.3  christos 	if (getsockname(s, (void *)&ss, &len) == -1)
     53  1.3  christos 		return -1;
     54  1.3  christos 	if (ss.ss_family != AF_LOCAL) {
     55  1.3  christos 		errno = EOPNOTSUPP;
     56  1.1        he 		return -1;
     57  1.1        he 	}
     58  1.3  christos 
     59  1.3  christos 	len = sizeof(cred);
     60  1.4       nia 	if (getsockopt(s, SOL_LOCAL, LOCAL_PEEREID, &cred, &len) == -1)
     61  1.3  christos 		return -1;
     62  1.3  christos 
     63  1.3  christos 	if (euid != NULL)
     64  1.3  christos 		*euid = cred.unp_euid;
     65  1.3  christos 	if (egid != NULL)
     66  1.3  christos 		*egid = cred.unp_egid;
     67  1.3  christos 	return 0;
     68  1.1        he }
     69