2 * Load and unload nsscash files (header)
4 * Copyright (C) 2019-2020 Simon Ruderich
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Affero General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Affero General Public License for more details.
16 * You should have received a copy of the GNU Affero General Public License
17 * along with this program. If not, see <https://www.gnu.org/licenses/>.
28 // Magic value at the beginning of each nsscash file (8 byte, without the
30 #define MAGIC "NSS-CASH"
32 // Defined in Makefile
33 #ifndef NSSCASH_PASSWD_FILE
34 # define NSSCASH_PASSWD_FILE "/etc/passwd.nsscash"
36 #ifndef NSSCASH_GROUP_FILE
37 # define NSSCASH_GROUP_FILE "/etc/group.nsscash"
41 // header describes the on-disk (and, after loading via mmap, in-memory)
42 // structure of nsscash files.
44 char magic[8]; // magic string
45 uint64_t version; // also doubles as byte-order check
47 uint64_t count; // number of entries in this file
49 // All offsets are relative to data
50 uint64_t off_orig_index;
51 uint64_t off_id_index;
52 uint64_t off_name_index;
56 } __attribute__((packed));
58 // file represents an open nsscash file.
63 const struct header *header;
64 uint64_t next_index; // used by getpwent (pw.c)
67 bool map_file(const char *path, struct file *f) __attribute__((visibility("hidden")));
68 void unmap_file(struct file *f) __attribute__((visibility("hidden")));