configd.tproj/_configlock.c

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