configd.tproj/_configremove.c

   1 /*
   2  * Copyright (c) 2000-2004, 2006, 2008, 2011, 2012, 2015-2017 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         SC_trace("%s : %5d : %@",
  48                  internal ? "*remove" : "remove ",
  49                  storePrivate->server,
  50                  key);
  51
  52         /*
  53          * Ensure that this key exists.
  54          */
  55         dict = CFDictionaryGetValue(storeData, key);
  56         if ((dict == NULL) || !CFDictionaryContainsKey(dict, kSCDData)) {
  57                 /* key doesn't exist (or data never defined) */
  58                 sc_status = kSCStatusNoKey;
  59                 goto done;
  60         }
  61         newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
  62
  63         /*
  64          * Mark this key as "changed". Any "watchers" will be
  65          * notified as soon as the lock is released.
  66          */
  67         CFSetAddValue(changedKeys, key);
  68
  69         /*
  70          * Add this key to a deferred cleanup list so that, after
  71          * the change notifications are posted, any associated
  72          * regex keys can be removed.
  73          */
  74         CFSetAddValue(deferredRemovals, key);
  75
  76         /*
  77          * Check if this is a session key and, if so, add it
  78          * to the (session) removal list
  79          */
  80         sessionKey = CFDictionaryGetValue(newDict, kSCDSession);
  81         if (sessionKey) {
  82                 CFStringRef     removedKey;
  83
  84                 /* We are no longer a session key! */
  85                 CFDictionaryRemoveValue(newDict, kSCDSession);
  86
  87                 /* add this session key to the (session) removal list */
  88                 removedKey = CFStringCreateWithFormat(NULL, 0, CFSTR("%@:%@"), sessionKey, key);
  89                 CFSetAddValue(removedSessionKeys, removedKey);
  90                 CFRelease(removedKey);
  91         }
  92
  93         /*
  94          * Remove data and update/remove the dictionary store entry.
  95          */
  96         CFDictionaryRemoveValue(newDict, kSCDData);
  97         if (CFDictionaryGetCount(newDict) > 0) {
  98                 /* this key is still being "watched" */
  99                 CFDictionarySetValue(storeData, key, newDict);
 100         } else {
 101                 /* no information left, remove the empty dictionary */
 102                 CFDictionaryRemoveValue(storeData, key);
 103         }
 104         CFRelease(newDict);
 105
 106         if (!internal) {
 107                 /* push changes */
 108                 __SCDynamicStorePush();
 109         }
 110
 111     done:
 112
 113         return sc_status;
 114 }
 115
 116
 117 __private_extern__
 118 kern_return_t
 119 _configremove(mach_port_t               server,
 120               xmlData_t                 keyRef,         /* raw XML bytes */
 121               mach_msg_type_number_t    keyLen,
 122               int                       *sc_status,
 123               audit_token_t             audit_token)
 124 {
 125         CFStringRef             key             = NULL;         /* key  (un-serialized) */
 126         serverSessionRef        mySession;
 127
 128         /* un-serialize the key */
 129         if (!_SCUnserializeString(&key, NULL, (void *)keyRef, keyLen)) {
 130                 *sc_status = kSCStatusFailed;
 131                 goto done;
 132         }
 133
 134         if (!isA_CFString(key)) {
 135                 *sc_status = kSCStatusInvalidArgument;
 136                 goto done;
 137         }
 138
 139         mySession = getSession(server);
 140         if (mySession == NULL) {
 141                 mySession = tempSession(server, CFSTR("SCDynamicStoreRemoveValue"), audit_token);
 142                 if (mySession == NULL) {
 143                         /* you must have an open session to play */
 144                         *sc_status = kSCStatusNoStoreSession;
 145                         goto done;
 146                 }
 147         }
 148
 149         if (!hasWriteAccess(mySession, "remove", key)) {
 150                 *sc_status = kSCStatusAccessError;
 151                 goto done;
 152         }
 153
 154         *sc_status = __SCDynamicStoreRemoveValue(mySession->store, key, FALSE);
 155
 156     done :
 157
 158         if (key)        CFRelease(key);
 159
 160         return KERN_SUCCESS;
 161 }
 162