SystemConfiguration.fproj/SCDNotifierInformViaFD.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2003-2005, 2008-2011, 2013, 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  * April 5, 2000                Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include "SCDynamicStoreInternal.h"
  35 #include "config.h"             /* MiG generated file */
  36
  37 #include <paths.h>
  38 #include <unistd.h>
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41 #include <sys/un.h>
  42
  43 Boolean
  44 SCDynamicStoreNotifyFileDescriptor(SCDynamicStoreRef    store,
  45                                     int32_t             identifier,
  46                                     int                 *fd)
  47 {
  48 #ifdef  VERBOSE_ACTIVITY_LOGGING
  49         struct os_activity_scope_state_s        activity_state;
  50 #endif  // VERBOSE_ACTIVITY_LOGGING
  51         int                                     fildes[2]       = { -1, -1 };
  52         fileport_t                              fileport        = MACH_PORT_NULL;
  53         int                                     ret;
  54         int                                     sc_status;
  55         SCDynamicStorePrivateRef                storePrivate = (SCDynamicStorePrivateRef)store;
  56         kern_return_t                           status;
  57
  58         if (store == NULL) {
  59                 /* sorry, you must provide a session */
  60                 _SCErrorSet(kSCStatusNoStoreSession);
  61                 return FALSE;
  62         }
  63
  64         if (storePrivate->server == MACH_PORT_NULL) {
  65                 /* sorry, you must have an open session to play */
  66                 _SCErrorSet(kSCStatusNoStoreServer);
  67                 return FALSE;
  68         }
  69
  70         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  71                 /* sorry, you can only have one notification registered at once */
  72                 _SCErrorSet(kSCStatusNotifierActive);
  73                 return FALSE;
  74         }
  75
  76         ret = pipe(fildes);
  77         if (ret == -1) {
  78                 _SCErrorSet(errno);
  79                 SC_log(LOG_ERR, "pipe() failed: %s", strerror(errno));
  80                 goto fail;
  81         }
  82
  83         /*
  84          * send fildes[1], the sender's fd, to configd using a fileport and
  85          * return fildes[0] to the caller.
  86          */
  87
  88         fileport = MACH_PORT_NULL;
  89         ret = fileport_makeport(fildes[1], &fileport);
  90         if (ret < 0) {
  91                 _SCErrorSet(errno);
  92                 SC_log(LOG_ERR, "fileport_makeport() failed: %s", strerror(errno));
  93                 goto fail;
  94         }
  95
  96 #ifdef  VERBOSE_ACTIVITY_LOGGING
  97         os_activity_scope_enter(storePrivate->activity, &activity_state);
  98 #endif  // VERBOSE_ACTIVITY_LOGGING
  99
 100     retry :
 101
 102         status = notifyviafd(storePrivate->server,
 103                              fileport,
 104                              identifier,
 105                              (int *)&sc_status);
 106
 107         if (__SCDynamicStoreCheckRetryAndHandleError(store,
 108                                                      status,
 109                                                      &sc_status,
 110                                                      "SCDynamicStoreNotifyFileDescriptor notifyviafd()")) {
 111                 goto retry;
 112         }
 113
 114 #ifdef  VERBOSE_ACTIVITY_LOGGING
 115         os_activity_scope_leave(&activity_state);
 116 #endif  // VERBOSE_ACTIVITY_LOGGING
 117
 118         if (status != KERN_SUCCESS) {
 119                 _SCErrorSet(status);
 120                 goto fail;
 121         }
 122
 123         if (sc_status != kSCStatusOK) {
 124                 _SCErrorSet(sc_status);
 125                 goto fail;
 126         }
 127
 128         /* the SCDynamicStore server now has a copy of the write side, close our reference */
 129         (void) close(fildes[1]);
 130
 131         /* and keep the read side */
 132         *fd = fildes[0];
 133
 134         /* set notifier active */
 135         storePrivate->notifyStatus = Using_NotifierInformViaFD;
 136
 137         return TRUE;
 138
 139     fail :
 140
 141         if (fildes[0] != -1) close(fildes[0]);
 142         if (fildes[1] != -1) close(fildes[1]);
 143         return FALSE;
 144 }