3 Memory-resident database... */
6 * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
7 * Copyright (c) 1995-2003 by Internet Software Consortium
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
13 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
19 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 * Internet Systems Consortium, Inc.
23 * Redwood City, CA 94063
25 * https://www.isc.org/
27 * This software has been written for Internet Systems Consortium
28 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
29 * To learn more about Internet Systems Consortium, see
30 * ``https://www.isc.org/''. To learn more about Vixie Enterprises,
31 * see ``http://www.vix.com''. To learn more about Nominum, Inc., see
32 * ``http://www.nominum.com''.
37 struct group *root_group;
38 group_hash_t *group_name_hash;
39 int (*group_write_hook) (struct group_object *);
41 isc_result_t delete_group (struct group_object *group, int writep)
43 struct group_object *d;
45 /* The group should exist and be hashed - if not, it's invalid. */
46 if (group_name_hash) {
47 d = (struct group_object *)0;
48 group_hash_lookup (&d, group_name_hash, group -> name,
49 strlen (group -> name), MDL);
51 return DHCP_R_INVALIDARG;
53 return DHCP_R_INVALIDARG;
55 /* Also not okay to delete a group that's not the one in
58 return DHCP_R_INVALIDARG;
60 /* If it's dynamic, and we're deleting it, we can just blow away the
62 if ((group -> flags & GROUP_OBJECT_DYNAMIC) &&
63 !(group -> flags & GROUP_OBJECT_STATIC)) {
64 group_hash_delete (group_name_hash,
65 group -> name, strlen (group -> name), MDL);
67 group -> flags |= GROUP_OBJECT_DELETED;
69 group_dereference (&group -> group, MDL);
72 /* Store the group declaration in the lease file. */
73 if (writep && group_write_hook) {
74 if (!(*group_write_hook) (group))
80 isc_result_t supersede_group (struct group_object *group, int writep)
82 struct group_object *t;
84 /* Register the group in the group name hash table,
85 so we can look it up later. */
86 if (group_name_hash) {
87 t = (struct group_object *)0;
88 group_hash_lookup (&t, group_name_hash,
90 strlen (group -> name), MDL);
91 if (t && t != group) {
92 /* If this isn't a dynamic entry, then we need to flag
93 the replacement as not dynamic either - otherwise,
94 if the dynamic entry is deleted later, the static
95 entry will come back next time the server is stopped
97 if (!(t -> flags & GROUP_OBJECT_DYNAMIC))
98 group -> flags |= GROUP_OBJECT_STATIC;
100 /* Delete the old object if it hasn't already been
101 deleted. If it has already been deleted, get rid of
102 the hash table entry. This is a legitimate
103 situation - a deleted static object needs to be kept
104 around so we remember it's deleted. */
105 if (!(t -> flags & GROUP_OBJECT_DELETED))
108 group_hash_delete (group_name_hash,
110 strlen (group -> name),
112 group_object_dereference (&t, MDL);
116 group_new_hash(&group_name_hash, GROUP_HASH_SIZE, MDL);
117 t = (struct group_object *)0;
120 /* Add the group to the group name hash if it's not
121 already there, and also thread it into the list of
122 dynamic groups if appropriate. */
124 group_hash_add (group_name_hash, group -> name,
125 strlen (group -> name), group, MDL);
128 /* Store the group declaration in the lease file. */
129 if (writep && group_write_hook) {
130 if (!(*group_write_hook) (group))
131 return ISC_R_IOERROR;
133 return ISC_R_SUCCESS;
136 int clone_group (struct group **gp, struct group *group,
137 const char *file, int line)
139 struct group *g = (struct group *)0;
141 /* Normally gp should contain the null pointer, but for convenience
142 it's permissible to clone a group into itself. */
143 if (*gp && *gp != group)
145 if (!group_allocate (&g, file, line))
148 *gp = (struct group *)0;
149 group_reference (gp, g, file, line);
150 g -> authoritative = group -> authoritative;
151 group_reference (&g -> next, group, file, line);
152 group_dereference (&g, file, line);