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/*
* Copyright (c) 1990 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2001 - 2005, Tomasz Kłoczko
* Copyright (c) 2007 - 2010, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id$ */
#ifndef COMMONIO_H
#define COMMONIO_H
#ifdef WITH_SELINUX
#include <selinux/selinux.h>
#endif
#include "defines.h" /* bool */
/*
* Linked list entry.
*/
struct commonio_entry {
/*@null@*/char *line;
/*@null@*/void *eptr; /* struct passwd, struct spwd, ... */
/*@dependent@*/ /*@null@*/struct commonio_entry *prev;
/*@owned@*/ /*@null@*/struct commonio_entry *next;
bool changed:1;
};
/*
* Operations depending on database type: passwd, group, shadow etc.
*/
struct commonio_ops {
/*
* Make a copy of the object (for example, struct passwd)
* and all strings pointed by it, in malloced memory.
*/
/*@null@*/ /*@only@*/void *(*dup) (const void *);
/*
* free() the object including any strings pointed by it.
*/
void (*free) (/*@out@*/ /*@only@*/void *);
/*
* Return the name of the object (for example, pw_name
* for struct passwd).
*/
const char *(*getname) (const void *);
/*
* Parse a string, return object (in static area -
* should be copied using the dup operation above).
*/
void *(*parse) (const char *);
/*
* Write the object to the file (this calls putpwent()
* for struct passwd, for example).
*/
int (*put) (const void *, FILE *);
/*
* fgets and fputs (can be replaced by versions that
* understand line continuation conventions).
*/
/*@null@*/char *(*fgets) (/*@returned@*/ /*@out@*/char *s, int n, FILE *stream);
int (*fputs) (const char *, FILE *);
/*
* open_hook and close_hook.
* If non NULL, these functions will be called after the database
* is open or before it is closed.
* They return 0 on failure and 1 on success.
*/
/*@null@*/int (*open_hook) (void);
/*@null@*/int (*close_hook) (void);
};
/*
* Database structure.
*/
struct commonio_db {
/*
* Name of the data file.
*/
char filename[1024];
/*
* Operations from above.
*/
/*@observer@*/const struct commonio_ops *ops;
/*
* Currently open file stream.
*/
/*@dependent@*/ /*@null@*/FILE *fp;
#ifdef WITH_SELINUX
/*@null@*/security_context_t scontext;
#endif
/*
* Default permissions and owner for newly created data file.
*/
mode_t st_mode;
uid_t st_uid;
gid_t st_gid;
/*
* Head, tail, current position in linked list.
*/
/*@owned@*/ /*@null@*/struct commonio_entry *head;
/*@dependent@*/ /*@null@*/struct commonio_entry *tail;
/*@dependent@*/ /*@null@*/struct commonio_entry *cursor;
/*
* Various flags.
*/
bool changed:1;
bool isopen:1;
bool locked:1;
bool readonly:1;
};
extern int commonio_setname (struct commonio_db *, const char *);
extern bool commonio_present (const struct commonio_db *db);
extern int commonio_lock (struct commonio_db *);
extern int commonio_lock_nowait (struct commonio_db *, bool log);
extern int commonio_open (struct commonio_db *, int);
extern /*@observer@*/ /*@null@*/const void *commonio_locate (struct commonio_db *, const char *);
extern int commonio_update (struct commonio_db *, const void *);
#ifdef ENABLE_SUBIDS
extern int commonio_append (struct commonio_db *, const void *);
#endif /* ENABLE_SUBIDS */
extern int commonio_remove (struct commonio_db *, const char *);
extern int commonio_rewind (struct commonio_db *);
extern /*@observer@*/ /*@null@*/const void *commonio_next (struct commonio_db *);
extern int commonio_close (struct commonio_db *);
extern int commonio_unlock (struct commonio_db *);
extern void commonio_del_entry (struct commonio_db *,
const struct commonio_entry *);
extern int commonio_sort_wrt (struct commonio_db *shadow,
const struct commonio_db *passwd);
extern int commonio_sort (struct commonio_db *db,
int (*cmp) (const void *, const void *));
#endif
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