/* memory.c Memory-resident database... */ /* * Copyright (c) 1995-2002 Internet Software Consortium. * 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 Internet Software Consortium 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 INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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. * * This software has been written for the Internet Software Consortium * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc. * To learn more about the Internet Software Consortium, see * ``http://www.isc.org/''. To learn more about Vixie Enterprises, * see ``http://www.vix.com''. To learn more about Nominum, Inc., see * ``http://www.nominum.com''. */ #ifndef lint static char copyright[] = "$Id: memory.c,v 1.66.2.4 2002/11/17 02:26:58 dhankins Exp $ Copyright (c) 1995-2002 The Internet Software Consortium. All rights reserved.\n"; #endif /* not lint */ #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 ISC_R_INVALIDARG; if (!d) return ISC_R_INVALIDARG; /* Also not okay to delete a group that's not the one in the hash table. */ if (d != group) return ISC_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, *u; isc_result_t status; /* 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, 0, 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) { isc_result_t status; 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; }