SystemConfiguration.fproj/SCDNotifierInformViaFD.c

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