OpenBSD-4.6/kerberosV/src/lib/hdb/ndbm.c
/*
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*/
#include "hdb_locl.h"
RCSID("$KTH: ndbm.c,v 1.34 2003/09/19 00:20:43 lha Exp $");
#if HAVE_NDBM
#if defined(HAVE_GDBM_NDBM_H)
#include <gdbm/ndbm.h>
#elif defined(HAVE_NDBM_H)
#include <ndbm.h>
#elif defined(HAVE_DBM_H)
#include <dbm.h>
#endif
struct ndbm_db {
DBM *db;
int lock_fd;
};
static krb5_error_code
NDBM_destroy(krb5_context context, HDB *db)
{
krb5_error_code ret;
ret = hdb_clear_master_key (context, db);
free(db->hdb_name);
free(db);
return 0;
}
static krb5_error_code
NDBM_lock(krb5_context context, HDB *db, int operation)
{
struct ndbm_db *d = db->hdb_db;
return hdb_lock(d->lock_fd, operation);
}
static krb5_error_code
NDBM_unlock(krb5_context context, HDB *db)
{
struct ndbm_db *d = db->hdb_db;
return hdb_unlock(d->lock_fd);
}
static krb5_error_code
NDBM_seq(krb5_context context, HDB *db,
unsigned flags, hdb_entry *entry, int first)
{
struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
datum key, value;
krb5_data key_data, data;
krb5_error_code ret = 0;
if(first)
key = dbm_firstkey(d->db);
else
key = dbm_nextkey(d->db);
if(key.dptr == NULL)
return HDB_ERR_NOENTRY;
key_data.data = key.dptr;
key_data.length = key.dsize;
ret = db->hdb_lock(context, db, HDB_RLOCK);
if(ret) return ret;
value = dbm_fetch(d->db, key);
db->hdb_unlock(context, db);
data.data = value.dptr;
data.length = value.dsize;
if(hdb_value2entry(context, &data, entry))
return NDBM_seq(context, db, flags, entry, 0);
if (db->hdb_master_key_set && (flags & HDB_F_DECRYPT)) {
ret = hdb_unseal_keys (context, db, entry);
if (ret)
hdb_free_entry (context, entry);
}
if (entry->principal == NULL) {
entry->principal = malloc (sizeof(*entry->principal));
if (entry->principal == NULL) {
ret = ENOMEM;
hdb_free_entry (context, entry);
krb5_set_error_string(context, "malloc: out of memory");
} else {
hdb_key2principal (context, &key_data, entry->principal);
}
}
return ret;
}
static krb5_error_code
NDBM_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
{
return NDBM_seq(context, db, flags, entry, 1);
}
static krb5_error_code
NDBM_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry *entry)
{
return NDBM_seq(context, db, flags, entry, 0);
}
static krb5_error_code
NDBM_rename(krb5_context context, HDB *db, const char *new_name)
{
/* XXX this function will break */
struct ndbm_db *d = db->hdb_db;
int ret;
char *old_dir, *old_pag, *new_dir, *new_pag;
char *new_lock;
int lock_fd;
/* lock old and new databases */
ret = db->hdb_lock(context, db, HDB_WLOCK);
if(ret)
return ret;
asprintf(&new_lock, "%s.lock", new_name);
if(new_lock == NULL) {
db->hdb_unlock(context, db);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
lock_fd = open(new_lock, O_RDWR | O_CREAT, 0600);
if(lock_fd < 0) {
ret = errno;
db->hdb_unlock(context, db);
krb5_set_error_string(context, "open(%s): %s", new_lock,
strerror(ret));
free(new_lock);
return ret;
}
free(new_lock);
ret = hdb_lock(lock_fd, HDB_WLOCK);
if(ret) {
db->hdb_unlock(context, db);
close(lock_fd);
return ret;
}
asprintf(&old_dir, "%s.dir", db->hdb_name);
asprintf(&old_pag, "%s.pag", db->hdb_name);
asprintf(&new_dir, "%s.dir", new_name);
asprintf(&new_pag, "%s.pag", new_name);
ret = rename(old_dir, new_dir) || rename(old_pag, new_pag);
free(old_dir);
free(old_pag);
free(new_dir);
free(new_pag);
hdb_unlock(lock_fd);
db->hdb_unlock(context, db);
if(ret) {
ret = errno;
close(lock_fd);
krb5_set_error_string(context, "rename: %s", strerror(ret));
return ret;
}
close(d->lock_fd);
d->lock_fd = lock_fd;
free(db->hdb_name);
db->hdb_name = strdup(new_name);
return 0;
}
static krb5_error_code
NDBM__get(krb5_context context, HDB *db, krb5_data key, krb5_data *reply)
{
struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
datum k, v;
int code;
k.dptr = key.data;
k.dsize = key.length;
code = db->hdb_lock(context, db, HDB_RLOCK);
if(code)
return code;
v = dbm_fetch(d->db, k);
db->hdb_unlock(context, db);
if(v.dptr == NULL)
return HDB_ERR_NOENTRY;
krb5_data_copy(reply, v.dptr, v.dsize);
return 0;
}
static krb5_error_code
NDBM__put(krb5_context context, HDB *db, int replace,
krb5_data key, krb5_data value)
{
struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
datum k, v;
int code;
k.dptr = key.data;
k.dsize = key.length;
v.dptr = value.data;
v.dsize = value.length;
code = db->hdb_lock(context, db, HDB_WLOCK);
if(code)
return code;
code = dbm_store(d->db, k, v, replace ? DBM_REPLACE : DBM_INSERT);
db->hdb_unlock(context, db);
if(code == 1)
return HDB_ERR_EXISTS;
if (code < 0)
return code;
return 0;
}
static krb5_error_code
NDBM__del(krb5_context context, HDB *db, krb5_data key)
{
struct ndbm_db *d = (struct ndbm_db *)db->hdb_db;
datum k;
int code;
krb5_error_code ret;
k.dptr = key.data;
k.dsize = key.length;
ret = db->hdb_lock(context, db, HDB_WLOCK);
if(ret) return ret;
code = dbm_delete(d->db, k);
db->hdb_unlock(context, db);
if(code < 0)
return errno;
return 0;
}
static krb5_error_code
NDBM_open(krb5_context context, HDB *db, int flags, mode_t mode)
{
krb5_error_code ret;
struct ndbm_db *d = malloc(sizeof(*d));
char *lock_file;
if(d == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
asprintf(&lock_file, "%s.lock", (char*)db->hdb_name);
if(lock_file == NULL) {
free(d);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
d->db = dbm_open((char*)db->hdb_name, flags, mode);
if(d->db == NULL){
ret = errno;
free(d);
free(lock_file);
krb5_set_error_string(context, "dbm_open(%s): %s", db->hdb_name,
strerror(ret));
return ret;
}
d->lock_fd = open(lock_file, O_RDWR | O_CREAT, 0600);
if(d->lock_fd < 0){
ret = errno;
dbm_close(d->db);
free(d);
krb5_set_error_string(context, "open(%s): %s", lock_file,
strerror(ret));
free(lock_file);
return ret;
}
free(lock_file);
db->hdb_db = d;
if((flags & O_ACCMODE) == O_RDONLY)
ret = hdb_check_db_format(context, db);
else
ret = hdb_init_db(context, db);
if(ret == HDB_ERR_NOENTRY)
return 0;
return ret;
}
static krb5_error_code
NDBM_close(krb5_context context, HDB *db)
{
struct ndbm_db *d = db->hdb_db;
dbm_close(d->db);
close(d->lock_fd);
free(d);
return 0;
}
krb5_error_code
hdb_ndbm_create(krb5_context context, HDB **db,
const char *filename)
{
*db = malloc(sizeof(**db));
if (*db == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
(*db)->hdb_db = NULL;
(*db)->hdb_name = strdup(filename);
if ((*db)->hdb_name == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
free(*db);
*db = NULL;
return ENOMEM;
}
(*db)->hdb_master_key_set = 0;
(*db)->hdb_openp = 0;
(*db)->hdb_open = NDBM_open;
(*db)->hdb_close = NDBM_close;
(*db)->hdb_fetch = _hdb_fetch;
(*db)->hdb_store = _hdb_store;
(*db)->hdb_remove = _hdb_remove;
(*db)->hdb_firstkey = NDBM_firstkey;
(*db)->hdb_nextkey= NDBM_nextkey;
(*db)->hdb_lock = NDBM_lock;
(*db)->hdb_unlock = NDBM_unlock;
(*db)->hdb_rename = NDBM_rename;
(*db)->hdb__get = NDBM__get;
(*db)->hdb__put = NDBM__put;
(*db)->hdb__del = NDBM__del;
(*db)->hdb_destroy = NDBM_destroy;
return 0;
}
#endif /* HAVE_NDBM */