1/* 2 File: __acl_from_xattr.c 3 4 Copyright (C) 1999, 2000 5 Andreas Gruenbacher, <a.gruenbacher@computer.org> 6 7 This program is free software; you can redistribute it and/or 8 modify it under the terms of the GNU Library General Public 9 License as published by the Free Software Foundation; either 10 version 2 of the License, or (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 Library General Public License for more details. 16 17 You should have received a copy of the GNU Library General Public 18 License along with this library; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 20*/ 21 22#include "libacl.h" 23 24#include "byteorder.h" 25#include "acl_ea.h" 26 27 28acl_t 29__acl_from_xattr(const char *ext_acl_p, size_t size) 30{ 31 acl_ea_header *ext_header_p = (acl_ea_header *)ext_acl_p; 32 acl_ea_entry *ext_entry_p = (acl_ea_entry *)(ext_header_p+1); 33 acl_ea_entry *ext_end_p; 34 acl_obj *acl_obj_p; 35 acl_entry_obj *entry_obj_p; 36 int entries, error; 37 38 if (size < sizeof(acl_ea_header)) { 39 errno = EINVAL; 40 return NULL; 41 } 42 if (ext_header_p->a_version != cpu_to_le32(ACL_EA_VERSION)) { 43 errno = EINVAL; 44 return NULL; 45 } 46 size -= sizeof(acl_ea_header); 47 if (size % sizeof(acl_ea_entry)) { 48 errno = EINVAL; 49 return NULL; 50 } 51 entries = size / sizeof(acl_ea_entry); 52 ext_end_p = ext_entry_p + entries; 53 54 acl_obj_p = __acl_init_obj(entries); 55 if (acl_obj_p == NULL) 56 return NULL; 57 while (ext_end_p != ext_entry_p) { 58 entry_obj_p = __acl_create_entry_obj(acl_obj_p); 59 if (!entry_obj_p) 60 goto fail; 61 62 entry_obj_p->etag = le16_to_cpu(ext_entry_p->e_tag); 63 entry_obj_p->eperm.sperm = le16_to_cpu(ext_entry_p->e_perm); 64 65 switch(entry_obj_p->etag) { 66 case ACL_USER_OBJ: 67 case ACL_GROUP_OBJ: 68 case ACL_MASK: 69 case ACL_OTHER: 70 entry_obj_p->eid.qid = ACL_UNDEFINED_ID; 71 break; 72 73 case ACL_USER: 74 case ACL_GROUP: 75 entry_obj_p->eid.qid = 76 le32_to_cpu(ext_entry_p->e_id); 77 break; 78 79 default: 80 error = EINVAL; 81 goto fail; 82 } 83 ext_entry_p++; 84 } 85 if (__acl_reorder_obj_p(acl_obj_p)) 86 goto fail; 87 return int2ext(acl_obj_p); 88 89fail: 90 __acl_free_acl_obj(acl_obj_p); 91 return NULL; 92} 93 94