acl_id_to_name.c revision 303975
1/*- 2 * Copyright (c) 1999-2001, 2008 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26/* 27 * Support functionality for the POSIX.1e ACL interface 28 * These calls are intended only to be called within the library. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: releng/11.0/lib/libc/posix1e/acl_id_to_name.c 209147 2010-06-14 02:26:13Z kientzle $"); 33 34#include <sys/types.h> 35#include "namespace.h" 36#include <sys/acl.h> 37#include "un-namespace.h" 38#include <errno.h> 39#include <grp.h> 40#include <pwd.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <string.h> 44#include <assert.h> 45 46#include "acl_support.h" 47 48/* 49 * Given a uid/gid, return a username/groupname for the text form of an ACL. 50 * Note that we truncate user and group names, rather than error out, as 51 * this is consistent with other tools manipulating user and group names. 52 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID 53 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE 54 * MAY HAVE SIDE-EFFECTS 55 */ 56int 57_posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf, 58 int flags) 59{ 60 struct group *g; 61 struct passwd *p; 62 int i; 63 64 switch(tag) { 65 case ACL_USER: 66 if (flags & ACL_TEXT_NUMERIC_IDS) 67 p = NULL; 68 else 69 p = getpwuid(id); 70 if (!p) 71 i = snprintf(buf, buf_len, "%d", id); 72 else 73 i = snprintf(buf, buf_len, "%s", p->pw_name); 74 75 if (i < 0) { 76 errno = ENOMEM; 77 return (-1); 78 } 79 return (0); 80 81 case ACL_GROUP: 82 if (flags & ACL_TEXT_NUMERIC_IDS) 83 g = NULL; 84 else 85 g = getgrgid(id); 86 if (g == NULL) 87 i = snprintf(buf, buf_len, "%d", id); 88 else 89 i = snprintf(buf, buf_len, "%s", g->gr_name); 90 91 if (i < 0) { 92 errno = ENOMEM; 93 return (-1); 94 } 95 return (0); 96 97 default: 98 return (EINVAL); 99 } 100} 101