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Memory-resident database... */
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* Copyright (c) 2004,2007 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1995-2003 by Internet Software Consortium
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* Internet Systems Consortium, Inc.
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* Redwood City, CA 94063
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* This software has been written for Internet Systems Consortium
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* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
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* To learn more about Internet Systems Consortium, see
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* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
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* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
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* ``http://www.nominum.com''.
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struct group *root_group;
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group_hash_t *group_name_hash;
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int (*group_write_hook) (struct group_object *);
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isc_result_t delete_group (struct group_object *group, int writep)
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struct group_object *d;
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/* The group should exist and be hashed - if not, it's invalid. */
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if (group_name_hash) {
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d = (struct group_object *)0;
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group_hash_lookup (&d, group_name_hash, group -> name,
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strlen (group -> name), MDL);
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return ISC_R_INVALIDARG;
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return ISC_R_INVALIDARG;
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/* Also not okay to delete a group that's not the one in
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return ISC_R_INVALIDARG;
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/* If it's dynamic, and we're deleting it, we can just blow away the
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if ((group -> flags & GROUP_OBJECT_DYNAMIC) &&
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!(group -> flags & GROUP_OBJECT_STATIC)) {
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group_hash_delete (group_name_hash,
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group -> name, strlen (group -> name), MDL);
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group -> flags |= GROUP_OBJECT_DELETED;
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group_dereference (&group -> group, MDL);
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/* Store the group declaration in the lease file. */
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if (writep && group_write_hook) {
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if (!(*group_write_hook) (group))
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isc_result_t supersede_group (struct group_object *group, int writep)
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struct group_object *t;
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/* Register the group in the group name hash table,
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so we can look it up later. */
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if (group_name_hash) {
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t = (struct group_object *)0;
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group_hash_lookup (&t, group_name_hash,
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strlen (group -> name), MDL);
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if (t && t != group) {
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/* If this isn't a dynamic entry, then we need to flag
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the replacement as not dynamic either - otherwise,
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if the dynamic entry is deleted later, the static
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entry will come back next time the server is stopped
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if (!(t -> flags & GROUP_OBJECT_DYNAMIC))
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group -> flags |= GROUP_OBJECT_STATIC;
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/* Delete the old object if it hasn't already been
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deleted. If it has already been deleted, get rid of
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the hash table entry. This is a legitimate
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situation - a deleted static object needs to be kept
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around so we remember it's deleted. */
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if (!(t -> flags & GROUP_OBJECT_DELETED))
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group_hash_delete (group_name_hash,
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strlen (group -> name),
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group_object_dereference (&t, MDL);
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group_new_hash(&group_name_hash, GROUP_HASH_SIZE, MDL);
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t = (struct group_object *)0;
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/* Add the group to the group name hash if it's not
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already there, and also thread it into the list of
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dynamic groups if appropriate. */
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group_hash_add (group_name_hash, group -> name,
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strlen (group -> name), group, MDL);
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/* Store the group declaration in the lease file. */
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if (writep && group_write_hook) {
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if (!(*group_write_hook) (group))
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return ISC_R_IOERROR;
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return ISC_R_SUCCESS;
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int clone_group (struct group **gp, struct group *group,
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const char *file, int line)
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struct group *g = (struct group *)0;
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/* Normally gp should contain the null pointer, but for convenience
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it's permissible to clone a group into itself. */
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if (*gp && *gp != group)
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if (!group_allocate (&g, file, line))
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*gp = (struct group *)0;
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group_reference (gp, g, file, line);
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g -> authoritative = group -> authoritative;
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group_reference (&g -> next, group, file, line);
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group_dereference (&g, file, line);