configd.tproj/_configlock.c

   1 /*
   2  * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  * Modification History
  28  *
  29  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  30  * - public API conversion
  31  *
  32  * March 24, 2000               Allan Nathanson <ajn@apple.com>
  33  * - initial revision
  34  */
  35
  36 #include "configd.h"
  37 #include "configd_server.h"
  38 #include "session.h"
  39
  40
  41 __private_extern__
  42 int
  43 __SCDynamicStoreLock(SCDynamicStoreRef store, Boolean recursive)
  44 {
  45         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  46         serverSessionRef                mySession;
  47
  48         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreLock:"));
  49
  50         if (!store || (storePrivate->server == MACH_PORT_NULL)) {
  51                 return kSCStatusNoStoreSession;         /* you must have an open session to play */
  52         }
  53
  54         if (storeLocked > 0) {
  55                 if (storePrivate->locked && recursive) {
  56                         /* if this session holds the lock and this is a recursive (internal) request */
  57                         storeLocked++;
  58                         return kSCStatusOK;
  59                 }
  60                 return kSCStatusLocked;                 /* sorry, someone (you) already have the lock */
  61         }
  62
  63         /* check credentials */
  64         mySession = getSession(storePrivate->server);
  65         if (mySession->callerEUID != 0) {
  66                 return kSCStatusAccessError;
  67         }
  68
  69         if (!recursive && _configd_trace) {
  70                 SCTrace(TRUE, _configd_trace, CFSTR("lock    : %5d\n"), storePrivate->server);
  71         }
  72
  73         storeLocked          = 1;       /* global lock flag */
  74         storePrivate->locked = TRUE;    /* per-session lock flag */
  75
  76         /*
  77          * defer all (actually, most) changes until the call to __SCDynamicStoreUnlock()
  78          */
  79         if (storeData_s) {
  80                 CFRelease(storeData_s);
  81                 CFRelease(patternData_s);
  82                 CFRelease(changedKeys_s);
  83                 CFRelease(deferredRemovals_s);
  84                 CFRelease(removedSessionKeys_s);
  85         }
  86         storeData_s          = CFDictionaryCreateMutableCopy(NULL, 0, storeData);
  87         patternData_s        = CFDictionaryCreateMutableCopy(NULL, 0, patternData);
  88         changedKeys_s        = CFSetCreateMutableCopy(NULL, 0, changedKeys);
  89         deferredRemovals_s   = CFSetCreateMutableCopy(NULL, 0, deferredRemovals);
  90         removedSessionKeys_s = CFSetCreateMutableCopy(NULL, 0, removedSessionKeys);
  91
  92         /* Add a "locked" mode run loop source for this port */
  93         CFRunLoopAddSource(CFRunLoopGetCurrent(), mySession->serverRunLoopSource, CFSTR("locked"));
  94
  95         return kSCStatusOK;
  96 }
  97
  98
  99 __private_extern__
 100 kern_return_t
 101 _configlock(mach_port_t server, int *sc_status)
 102 {
 103         serverSessionRef        mySession = getSession(server);
 104
 105         if (_configd_verbose) {
 106                 SCLog(TRUE, LOG_DEBUG, CFSTR("Lock configuration database."));
 107                 SCLog(TRUE, LOG_DEBUG, CFSTR("  server = %d"), server);
 108         }
 109
 110         if (!mySession) {
 111                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 112                 return KERN_SUCCESS;
 113         }
 114
 115         *sc_status = __SCDynamicStoreLock(mySession->store, FALSE);
 116         if (*sc_status != kSCStatusOK) {
 117                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  SCDynamicStoreLock(): %s"), SCErrorString(*sc_status));
 118                 return KERN_SUCCESS;
 119         }
 120
 121         return KERN_SUCCESS;
 122 }