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