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/*
* Copyright (c) 1997 - 2000 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("$Id: hdb.c,v 1.42 2000/11/15 23:12:15 assar Exp $");
struct hdb_method {
const char *prefix;
krb5_error_code (*create)(krb5_context, HDB **, const char *filename);
};
static struct hdb_method methods[] = {
#ifdef HAVE_DB_H
{"db:", hdb_db_create},
#endif
#if defined(HAVE_NDBM_H) || defined(HAVE_GDBM_NDBM_H)
{"ndbm:", hdb_ndbm_create},
#endif
#ifdef OPENLDAP
{"ldap:", hdb_ldap_create},
#endif
#ifdef HAVE_DB_H
{"", hdb_db_create},
#elif defined(HAVE_NDBM_H)
{"", hdb_ndbm_create},
#elif defined(OPENLDAP)
{"", hdb_ldap_create},
#endif
{NULL, NULL}
};
krb5_error_code
hdb_next_enctype2key(krb5_context context,
const hdb_entry *e,
krb5_enctype enctype,
Key **key)
{
Key *k;
for (k = *key ? (*key) + 1 : e->keys.val;
k < e->keys.val + e->keys.len;
k++)
if(k->key.keytype == enctype){
*key = k;
return 0;
}
return KRB5_PROG_ETYPE_NOSUPP; /* XXX */
}
krb5_error_code
hdb_enctype2key(krb5_context context,
hdb_entry *e,
krb5_enctype enctype,
Key **key)
{
*key = NULL;
return hdb_next_enctype2key(context, e, enctype, key);
}
void
hdb_free_key(Key *key)
{
memset(key->key.keyvalue.data,
0,
key->key.keyvalue.length);
free_Key(key);
free(key);
}
krb5_error_code
hdb_lock(int fd, int operation)
{
int i, code = 0;
for(i = 0; i < 3; i++){
code = flock(fd, (operation == HDB_RLOCK ? LOCK_SH : LOCK_EX) | LOCK_NB);
if(code == 0 || errno != EWOULDBLOCK)
break;
sleep(1);
}
if(code == 0)
return 0;
if(errno == EWOULDBLOCK)
return HDB_ERR_DB_INUSE;
return HDB_ERR_CANT_LOCK_DB;
}
krb5_error_code
hdb_unlock(int fd)
{
int code;
code = flock(fd, LOCK_UN);
if(code)
return 4711 /* XXX */;
return 0;
}
void
hdb_free_entry(krb5_context context, hdb_entry *ent)
{
int i;
for(i = 0; i < ent->keys.len; ++i) {
Key *k = &ent->keys.val[i];
memset (k->key.keyvalue.data, 0, k->key.keyvalue.length);
}
free_hdb_entry(ent);
}
krb5_error_code
hdb_foreach(krb5_context context,
HDB *db,
unsigned flags,
hdb_foreach_func_t func,
void *data)
{
krb5_error_code ret;
hdb_entry entry;
ret = db->firstkey(context, db, flags, &entry);
while(ret == 0){
ret = (*func)(context, db, &entry, data);
hdb_free_entry(context, &entry);
if(ret == 0)
ret = db->nextkey(context, db, flags, &entry);
}
if(ret == HDB_ERR_NOENTRY)
ret = 0;
return ret;
}
krb5_error_code
hdb_check_db_format(krb5_context context, HDB *db)
{
krb5_data tag;
krb5_data version;
krb5_error_code ret;
unsigned ver;
int foo;
tag.data = HDB_DB_FORMAT_ENTRY;
tag.length = strlen(tag.data);
ret = (*db->_get)(context, db, tag, &version);
if(ret)
return ret;
foo = sscanf(version.data, "%u", &ver);
krb5_data_free (&version);
if (foo != 1)
return HDB_ERR_BADVERSION;
if(ver != HDB_DB_FORMAT)
return HDB_ERR_BADVERSION;
return 0;
}
krb5_error_code
hdb_init_db(krb5_context context, HDB *db)
{
krb5_error_code ret;
krb5_data tag;
krb5_data version;
char ver[32];
ret = hdb_check_db_format(context, db);
if(ret != HDB_ERR_NOENTRY)
return ret;
tag.data = HDB_DB_FORMAT_ENTRY;
tag.length = strlen(tag.data);
snprintf(ver, sizeof(ver), "%u", HDB_DB_FORMAT);
version.data = ver;
version.length = strlen(version.data) + 1; /* zero terminated */
ret = (*db->_put)(context, db, 0, tag, version);
return ret;
}
/*
* find the relevant method for `filename', returning a pointer to the
* rest in `rest'.
* return NULL if there's no such method.
*/
static const struct hdb_method *
find_method (const char *filename, const char **rest)
{
const struct hdb_method *h;
for (h = methods; h->prefix != NULL; ++h)
if (strncmp (filename, h->prefix, strlen(h->prefix)) == 0) {
*rest = filename + strlen(h->prefix);
return h;
}
return NULL;
}
krb5_error_code
hdb_create(krb5_context context, HDB **db, const char *filename)
{
const struct hdb_method *h;
const char *residual;
if(filename == NULL)
filename = HDB_DEFAULT_DB;
initialize_hdb_error_table_r(&context->et_list);
h = find_method (filename, &residual);
if (h == NULL)
krb5_errx(context, 1, "No database support! (hdb_create)");
return (*h->create)(context, db, residual);
}
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