configd.tproj/_notifyviafd.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2003-2006, 2008-2011, 2015, 2019 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  * April 5, 2000                Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include <unistd.h>
  35 #include <sys/fileport.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/stat.h>
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <sys/un.h>
  41
  42 #include "configd.h"
  43 #include "session.h"
  44
  45
  46 __private_extern__
  47 int
  48 __SCDynamicStoreNotifyFileDescriptor(SCDynamicStoreRef  store)
  49 {
  50         serverSessionRef                mySession;
  51         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  52
  53         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  54                 /* sorry, you can only have one notification registered at once */
  55                 return kSCStatusNotifierActive;
  56         }
  57
  58         /* push out a notification if any changes are pending */
  59         mySession = getSession(storePrivate->server);
  60         if (mySession->changedKeys != NULL) {
  61                 CFNumberRef     sessionNum;
  62
  63                 if (needsNotification == NULL)
  64                         needsNotification = CFSetCreateMutable(NULL,
  65                                                                0,
  66                                                                &kCFTypeSetCallBacks);
  67
  68                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  69                 CFSetAddValue(needsNotification, sessionNum);
  70                 CFRelease(sessionNum);
  71         }
  72
  73         return kSCStatusOK;
  74 }
  75
  76
  77 __private_extern__
  78 kern_return_t
  79 _notifyviafd(mach_port_t        server,
  80              fileport_t         fileport,
  81              int                identifier,
  82              int                *sc_status
  83 )
  84 {
  85         int                             fd              = -1;
  86         int                             flags;
  87         serverSessionRef                mySession       = getSession(server);
  88         SCDynamicStorePrivateRef        storePrivate;
  89
  90         /* get notification file descriptor */
  91         fd = fileport_makefd(fileport);
  92         mach_port_deallocate(mach_task_self(), fileport);
  93         if (fd < 0) {
  94                 *sc_status = errno;
  95                 return KERN_SUCCESS;
  96         }
  97
  98         flags = fcntl(fd, F_GETFL, 0);
  99         if (flags == -1) {
 100                 *sc_status = errno;
 101                 goto fail;
 102         }
 103
 104         flags |= O_NONBLOCK;
 105         if (fcntl(fd, F_SETFL, flags) == -1) {
 106                 *sc_status = errno;
 107                 goto fail;
 108         }
 109
 110         if (mySession == NULL) {
 111                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 112                 goto fail;
 113         }
 114         storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 115
 116         /* do common sanity checks */
 117         *sc_status = __SCDynamicStoreNotifyFileDescriptor(mySession->store);
 118
 119         /* check status of __SCDynamicStoreNotifyFileDescriptor() */
 120         if (*sc_status != kSCStatusOK) {
 121                 goto fail;
 122         }
 123
 124         /* set notifier active */
 125         storePrivate->notifyStatus         = Using_NotifierInformViaFD;
 126         storePrivate->notifyFile           = fd;
 127         storePrivate->notifyFileIdentifier = identifier;
 128
 129         return KERN_SUCCESS;
 130
 131     fail :
 132
 133         if (fd >= 0) close(fd);
 134         return KERN_SUCCESS;
 135 }