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/* memory.c
Memory-resident database... */
/*
* Copyright (c) 2004-2017 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* PO Box 360
* Newmarket, NH 03857 USA
* <info@isc.org>
* https://www.isc.org/
*
*/
#include "dhcpd.h"
struct group *root_group;
group_hash_t *group_name_hash;
int (*group_write_hook) (struct group_object *);
isc_result_t delete_group (struct group_object *group, int writep)
{
struct group_object *d;
/* The group should exist and be hashed - if not, it's invalid. */
if (group_name_hash) {
d = (struct group_object *)0;
group_hash_lookup (&d, group_name_hash, group -> name,
strlen (group -> name), MDL);
} else
return DHCP_R_INVALIDARG;
if (!d)
return DHCP_R_INVALIDARG;
/* Also not okay to delete a group that's not the one in
the hash table. */
if (d != group)
return DHCP_R_INVALIDARG;
/* If it's dynamic, and we're deleting it, we can just blow away the
hash table entry. */
if ((group -> flags & GROUP_OBJECT_DYNAMIC) &&
!(group -> flags & GROUP_OBJECT_STATIC)) {
group_hash_delete (group_name_hash,
group -> name, strlen (group -> name), MDL);
} else {
group -> flags |= GROUP_OBJECT_DELETED;
if (group -> group)
group_dereference (&group -> group, MDL);
}
/* Store the group declaration in the lease file. */
if (writep && group_write_hook) {
if (!(*group_write_hook) (group))
return ISC_R_IOERROR;
}
return ISC_R_SUCCESS;
}
isc_result_t supersede_group (struct group_object *group, int writep)
{
struct group_object *t;
/* Register the group in the group name hash table,
so we can look it up later. */
if (group_name_hash) {
t = (struct group_object *)0;
group_hash_lookup (&t, group_name_hash,
group -> name,
strlen (group -> name), MDL);
if (t && t != group) {
/* If this isn't a dynamic entry, then we need to flag
the replacement as not dynamic either - otherwise,
if the dynamic entry is deleted later, the static
entry will come back next time the server is stopped
and restarted. */
if (!(t -> flags & GROUP_OBJECT_DYNAMIC))
group -> flags |= GROUP_OBJECT_STATIC;
/* Delete the old object if it hasn't already been
deleted. If it has already been deleted, get rid of
the hash table entry. This is a legitimate
situation - a deleted static object needs to be kept
around so we remember it's deleted. */
if (!(t -> flags & GROUP_OBJECT_DELETED))
delete_group (t, 0);
else {
group_hash_delete (group_name_hash,
group -> name,
strlen (group -> name),
MDL);
group_object_dereference (&t, MDL);
}
}
} else {
group_new_hash(&group_name_hash, GROUP_HASH_SIZE, MDL);
t = (struct group_object *)0;
}
/* Add the group to the group name hash if it's not
already there, and also thread it into the list of
dynamic groups if appropriate. */
if (!t) {
group_hash_add (group_name_hash, group -> name,
strlen (group -> name), group, MDL);
}
/* Store the group declaration in the lease file. */
if (writep && group_write_hook) {
if (!(*group_write_hook) (group))
return ISC_R_IOERROR;
}
return ISC_R_SUCCESS;
}
int clone_group (struct group **gp, struct group *group,
const char *file, int line)
{
struct group *g = (struct group *)0;
/* Normally gp should contain the null pointer, but for convenience
it's permissible to clone a group into itself. */
if (*gp && *gp != group)
return 0;
if (!group_allocate (&g, file, line))
return 0;
if (group == *gp)
*gp = (struct group *)0;
group_reference (gp, g, file, line);
g -> authoritative = group -> authoritative;
group_reference (&g -> next, group, file, line);
group_dereference (&g, file, line);
return 1;
}
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