configd.tproj/_configremove.c

   1 /*
   2  * Copyright (c) 2000-2004, 2006, 2008, 2011, 2012 Apple 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 "session.h"
  36
  37 __private_extern__
  38 int
  39 __SCDynamicStoreRemoveValue(SCDynamicStoreRef store, CFStringRef key, Boolean internal)
  40 {
  41         CFDictionaryRef                 dict;
  42         CFMutableDictionaryRef          newDict;
  43         SCDynamicStorePrivateRef        storePrivate    = (SCDynamicStorePrivateRef)store;
  44         int                             sc_status       = kSCStatusOK;
  45         CFStringRef                     sessionKey;
  46
  47         if (_configd_trace) {
  48                 SCTrace(TRUE, _configd_trace,
  49                         CFSTR("%s : %5d : %@\n"),
  50                         internal ? "*remove" : "remove ",
  51                         storePrivate->server,
  52                         key);
  53         }
  54
  55         /*
  56          * Ensure that this key exists.
  57          */
  58         dict = CFDictionaryGetValue(storeData, key);
  59         if ((dict == NULL) || (CFDictionaryContainsKey(dict, kSCDData) == FALSE)) {
  60                 /* key doesn't exist (or data never defined) */
  61                 sc_status = kSCStatusNoKey;
  62                 goto done;
  63         }
  64         newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
  65
  66         /*
  67          * Mark this key as "changed". Any "watchers" will be
  68          * notified as soon as the lock is released.
  69          */
  70         CFSetAddValue(changedKeys, key);
  71
  72         /*
  73          * Add this key to a deferred cleanup list so that, after
  74          * the change notifications are posted, any associated
  75          * regex keys can be removed.
  76          */
  77         CFSetAddValue(deferredRemovals, key);
  78
  79         /*
  80          * Check if this is a session key and, if so, add it
  81          * to the (session) removal list
  82          */
  83         sessionKey = CFDictionaryGetValue(newDict, kSCDSession);
  84         if (sessionKey) {
  85                 CFStringRef     removedKey;
  86
  87                 /* We are no longer a session key! */
  88                 CFDictionaryRemoveValue(newDict, kSCDSession);
  89
  90                 /* add this session key to the (session) removal list */
  91                 removedKey = CFStringCreateWithFormat(NULL, 0, CFSTR("%@:%@"), sessionKey, key);
  92                 CFSetAddValue(removedSessionKeys, removedKey);
  93                 CFRelease(removedKey);
  94         }
  95
  96         /*
  97          * Remove data and update/remove the dictionary store entry.
  98          */
  99         CFDictionaryRemoveValue(newDict, kSCDData);
 100         if (CFDictionaryGetCount(newDict) > 0) {
 101                 /* this key is still being "watched" */
 102                 CFDictionarySetValue(storeData, key, newDict);
 103         } else {
 104                 /* no information left, remove the empty dictionary */
 105                 CFDictionaryRemoveValue(storeData, key);
 106         }
 107         CFRelease(newDict);
 108
 109         if (!internal) {
 110                 /* push changes */
 111                 __SCDynamicStorePush();
 112         }
 113
 114     done:
 115
 116         return sc_status;
 117 }
 118
 119
 120 __private_extern__
 121 kern_return_t
 122 _configremove(mach_port_t               server,
 123               xmlData_t                 keyRef,         /* raw XML bytes */
 124               mach_msg_type_number_t    keyLen,
 125               int                       *sc_status,
 126               audit_token_t             audit_token)
 127 {
 128         CFStringRef             key             = NULL;         /* key  (un-serialized) */
 129         serverSessionRef        mySession;
 130
 131         /* un-serialize the key */
 132         if (!_SCUnserializeString(&key, NULL, (void *)keyRef, keyLen)) {
 133                 *sc_status = kSCStatusFailed;
 134                 goto done;
 135         }
 136
 137         if (!isA_CFString(key)) {
 138                 *sc_status = kSCStatusInvalidArgument;
 139                 goto done;
 140         }
 141
 142         mySession = getSession(server);
 143         if (mySession == NULL) {
 144                 mySession = tempSession(server, CFSTR("SCDynamicStoreRemoveValue"), audit_token);
 145                 if (mySession == NULL) {
 146                         /* you must have an open session to play */
 147                         *sc_status = kSCStatusNoStoreSession;
 148                         goto done;
 149                 }
 150         }
 151
 152         if (!hasWriteAccess(mySession, key)) {
 153                 *sc_status = kSCStatusAccessError;
 154                 goto done;
 155         }
 156
 157         *sc_status = __SCDynamicStoreRemoveValue(mySession->store, key, FALSE);
 158
 159     done :
 160
 161         if (key)        CFRelease(key);
 162
 163         return KERN_SUCCESS;
 164 }
 165