configd.tproj/_notifyadd.c

   1 /*
   2  * Copyright (c) 2000-2004, 2006, 2008, 2010, 2011, 2014, 2015 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 #include "pattern.h"
  37
  38
  39 static __inline__ void
  40 my_CFArrayApplyFunction(CFArrayRef              theArray,
  41                         CFArrayApplierFunction  applier,
  42                         void                    *context)
  43 {
  44         CFAllocatorRef  myAllocator;
  45         CFArrayRef      myArray;
  46
  47         myAllocator = CFGetAllocator(theArray);
  48         myArray     = CFArrayCreateCopy(myAllocator, theArray);
  49         CFArrayApplyFunction(myArray, CFRangeMake(0, CFArrayGetCount(myArray)), applier, context);
  50         CFRelease(myArray);
  51         return;
  52 }
  53
  54
  55 static int
  56 hasKey(CFMutableArrayRef keys, CFStringRef key)
  57 {
  58         if (keys != NULL) {
  59                 CFIndex n;
  60
  61                 n = CFArrayGetCount(keys);
  62                 if (CFArrayContainsValue(keys, CFRangeMake(0, n), key)) {
  63                         /* sorry, pattern already exists in notifier list */
  64                         return kSCStatusKeyExists;
  65                 }
  66         }
  67
  68         return kSCStatusOK;
  69 }
  70
  71
  72 static void
  73 addKey(CFMutableArrayRef *keysP, CFStringRef key)
  74 {
  75         if (*keysP == NULL) {
  76                 *keysP = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
  77         }
  78
  79         CFArrayAppendValue(*keysP, key);
  80         return;
  81 }
  82
  83
  84 __private_extern__
  85 int
  86 __SCDynamicStoreAddWatchedKey(SCDynamicStoreRef store, CFStringRef key, Boolean isRegex, Boolean internal)
  87 {
  88         int                             sc_status       = kSCStatusOK;
  89         CFNumberRef                     sessionNum      = NULL;
  90         SCDynamicStorePrivateRef        storePrivate    = (SCDynamicStorePrivateRef)store;
  91
  92         SC_trace(_configd_trace, "%s : %5d : %s : %@\n",
  93                  internal ? "*watch+" : "watch+ ",
  94                  storePrivate->server,
  95                  isRegex  ? "pattern" : "key",
  96                  key);
  97
  98         sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  99
 100         if (isRegex) {
 101                 sc_status = hasKey(storePrivate->patterns, key);
 102                 if (sc_status != kSCStatusOK) {
 103                         goto done;
 104                 }
 105
 106                 /*
 107                  * add this session as a pattern watcher
 108                  */
 109                 if (!patternAddSession(key, sessionNum)) {
 110                         sc_status = kSCStatusInvalidArgument;
 111                         goto done;
 112                 }
 113
 114                 /* add pattern to this sessions notifier list */
 115                 addKey(&storePrivate->patterns, key);
 116         } else {
 117                 sc_status = hasKey(storePrivate->keys, key);
 118                 if (sc_status != kSCStatusOK) {
 119                         goto done;
 120                 }
 121
 122                 /*
 123                  * We are watching a specific key. As such, update the
 124                  * store to mark our interest in any changes.
 125                  */
 126                 _addWatcher(sessionNum, key);
 127
 128                 /* add key to this sessions notifier list */
 129                 addKey(&storePrivate->keys, key);
 130         }
 131
 132     done :
 133
 134         if (sessionNum != NULL) CFRelease(sessionNum);
 135         return sc_status;
 136 }
 137
 138
 139 __private_extern__
 140 kern_return_t
 141 _notifyadd(mach_port_t                  server,
 142            xmlData_t                    keyRef,         /* raw XML bytes */
 143            mach_msg_type_number_t       keyLen,
 144            int                          isRegex,
 145            int                          *sc_status
 146 )
 147 {
 148         CFStringRef             key             = NULL; /* key  (un-serialized) */
 149         serverSessionRef        mySession;
 150
 151         /* un-serialize the key */
 152         if (!_SCUnserializeString(&key, NULL, (void *)keyRef, keyLen)) {
 153                 *sc_status = kSCStatusFailed;
 154                 goto done;
 155         }
 156
 157         if (!isA_CFString(key)) {
 158                 *sc_status = kSCStatusInvalidArgument;
 159                 goto done;
 160         }
 161
 162         mySession = getSession(server);
 163         if (mySession == NULL) {
 164                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 165                 goto done;
 166         }
 167
 168         *sc_status = __SCDynamicStoreAddWatchedKey(mySession->store, key, isRegex != 0, FALSE);
 169
 170     done :
 171
 172         if (key)        CFRelease(key);
 173         return KERN_SUCCESS;
 174 }
 175
 176
 177 /*
 178  * "context" argument for removeOldKey() and addNewKey()
 179  */
 180 typedef struct {
 181         SCDynamicStoreRef       store;
 182         CFArrayRef              oldKeys;        /* for addNewKey */
 183         CFArrayRef              newKeys;        /* for removeOldKey */
 184         Boolean                 isRegex;
 185         int                     sc_status;
 186 } updateKeysContext, *updateKeysContextRef;
 187
 188
 189 static void
 190 removeOldKey(const void *value, void *context)
 191 {
 192         CFStringRef                     oldKey          = (CFStringRef)value;
 193         updateKeysContextRef            myContextRef    = (updateKeysContextRef)context;
 194
 195         if (myContextRef->sc_status != kSCStatusOK) {
 196                 return;
 197         }
 198
 199         if ((myContextRef->newKeys == NULL) ||
 200             !CFArrayContainsValue(myContextRef->newKeys,
 201                                   CFRangeMake(0, CFArrayGetCount(myContextRef->newKeys)),
 202                                   oldKey)) {
 203                 /* the old notification key is not being retained, remove it */
 204                 myContextRef->sc_status = __SCDynamicStoreRemoveWatchedKey(myContextRef->store,
 205                                                                            oldKey,
 206                                                                            myContextRef->isRegex,
 207                                                                            TRUE);
 208         }
 209
 210         return;
 211 }
 212
 213
 214 static void
 215 addNewKey(const void *value, void *context)
 216 {
 217         CFStringRef                     newKey          = (CFStringRef)value;
 218         updateKeysContextRef            myContextRef    = (updateKeysContextRef)context;
 219
 220         if (myContextRef->sc_status != kSCStatusOK) {
 221                 return;
 222         }
 223
 224         if ((myContextRef->oldKeys == NULL) ||
 225             !CFArrayContainsValue(myContextRef->oldKeys,
 226                                   CFRangeMake(0, CFArrayGetCount(myContextRef->oldKeys)),
 227                                   newKey)) {
 228                 /* if this is a new notification key */
 229                 myContextRef->sc_status = __SCDynamicStoreAddWatchedKey(myContextRef->store,
 230                                                                         newKey,
 231                                                                         myContextRef->isRegex,
 232                                                                         TRUE);
 233         }
 234
 235         return;
 236 }
 237
 238
 239 __private_extern__
 240 int
 241 __SCDynamicStoreSetNotificationKeys(SCDynamicStoreRef store, CFArrayRef keys, CFArrayRef patterns)
 242 {
 243         updateKeysContext               myContext;
 244         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
 245
 246         SC_trace(_configd_trace, "watch   : %5d : %ld keys, %ld patterns\n",
 247                  storePrivate->server,
 248                  keys     ? CFArrayGetCount(keys)     : 0,
 249                  patterns ? CFArrayGetCount(patterns) : 0);
 250
 251         myContext.store     = store;
 252         myContext.sc_status = kSCStatusOK;
 253
 254         /* remove any previously registered keys, register any new keys */
 255         myContext.oldKeys = NULL;
 256         myContext.newKeys = keys;
 257         myContext.isRegex = FALSE;
 258         if (storePrivate->keys != NULL) {
 259                 myContext.oldKeys = CFArrayCreateCopy(NULL, storePrivate->keys);
 260                 my_CFArrayApplyFunction(storePrivate->keys, removeOldKey, &myContext);
 261         }
 262         if (keys != NULL) {
 263                 CFArrayApplyFunction(keys,
 264                                      CFRangeMake(0, CFArrayGetCount(keys)),
 265                                      addNewKey,
 266                                      &myContext);
 267         }
 268         if (myContext.oldKeys != NULL) CFRelease(myContext.oldKeys);
 269
 270         /* remove any previously registered patterns, register any new patterns */
 271         myContext.oldKeys = NULL;
 272         myContext.newKeys = patterns;
 273         myContext.isRegex = TRUE;
 274         if (storePrivate->patterns != NULL) {
 275                 myContext.oldKeys = CFArrayCreateCopy(NULL, storePrivate->patterns);
 276                 my_CFArrayApplyFunction(storePrivate->patterns, removeOldKey, &myContext);
 277         }
 278         if (patterns != NULL) {
 279                 CFArrayApplyFunction(patterns,
 280                                      CFRangeMake(0, CFArrayGetCount(patterns)),
 281                                      addNewKey,
 282                                      &myContext);
 283         }
 284         if (myContext.oldKeys != NULL) CFRelease(myContext.oldKeys);
 285
 286         return myContext.sc_status;
 287 }
 288
 289
 290 __private_extern__
 291 kern_return_t
 292 _notifyset(mach_port_t                  server,
 293            xmlData_t                    keysRef,                /* raw XML bytes */
 294            mach_msg_type_number_t       keysLen,
 295            xmlData_t                    patternsRef,            /* raw XML bytes */
 296            mach_msg_type_number_t       patternsLen,
 297            int                          *sc_status
 298 )
 299 {
 300         CFArrayRef              keys            = NULL; /* key (un-serialized) */
 301         serverSessionRef        mySession;
 302         CFArrayRef              patterns        = NULL; /* patterns (un-serialized) */
 303
 304         *sc_status = kSCStatusOK;
 305
 306         if ((keysRef != NULL) && (keysLen > 0)) {
 307                 /* un-serialize the keys */
 308                 if (!_SCUnserialize((CFPropertyListRef *)&keys, NULL, (void *)keysRef, keysLen)) {
 309                         *sc_status = kSCStatusFailed;
 310                 }
 311         }
 312
 313         if ((patternsRef != NULL) && (patternsLen > 0)) {
 314                 /* un-serialize the patterns */
 315                 if (!_SCUnserialize((CFPropertyListRef *)&patterns, NULL, (void *)patternsRef, patternsLen)) {
 316                         *sc_status = kSCStatusFailed;
 317                 }
 318         }
 319
 320         if (*sc_status != kSCStatusOK) {
 321                 goto done;
 322         }
 323
 324         if ((keys != NULL) && !isA_CFArray(keys)) {
 325                 *sc_status = kSCStatusInvalidArgument;
 326                 goto done;
 327         }
 328
 329         if ((patterns != NULL) && !isA_CFArray(patterns)) {
 330                 *sc_status = kSCStatusInvalidArgument;
 331                 goto done;
 332         }
 333
 334         mySession = getSession(server);
 335         if (mySession == NULL) {
 336                 /* you must have an open session to play */
 337                 *sc_status = kSCStatusNoStoreSession;
 338                 goto done;
 339         }
 340
 341         *sc_status = __SCDynamicStoreSetNotificationKeys(mySession->store, keys, patterns);
 342
 343     done :
 344
 345         if (keys != NULL)       CFRelease(keys);
 346         if (patterns != NULL)   CFRelease(patterns);
 347
 348         return KERN_SUCCESS;
 349 }