configd.tproj/_notifyviafd.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 /*
  24  * Modification History
  25  *
  26  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  27  * - public API conversion
  28  *
  29  * April 5, 2000                Allan Nathanson <ajn@apple.com>
  30  * - initial revision
  31  */
  32
  33 #include <unistd.h>
  34 #include <sys/ioctl.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38
  39 #include "configd.h"
  40 #include "session.h"
  41
  42
  43 int
  44 __SCDynamicStoreNotifyFileDescriptor(SCDynamicStoreRef  store,
  45                                      int32_t            identifier,
  46                                      int                *fd)
  47 {
  48         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  49         int                             sock;
  50         CFStringRef                     sessionKey;
  51         CFDictionaryRef                 info;
  52
  53         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreNotifyFileDescriptor:"));
  54
  55         if (!store || (storePrivate->server == MACH_PORT_NULL)) {
  56                 return kSCStatusNoStoreSession; /* you must have an open session to play */
  57         }
  58
  59         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  60                 /* sorry, you can only have one notification registered at once */
  61                 return kSCStatusNotifierActive;
  62         }
  63
  64         if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
  65                 SCLog(_configd_verbose, LOG_NOTICE, CFSTR("socket: %s"), strerror(errno));
  66                 return kSCStatusFailed;
  67         }
  68
  69         *fd = sock;
  70
  71         /* push out a notification if any changes are pending */
  72         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  73         info = CFDictionaryGetValue(sessionData, sessionKey);
  74         CFRelease(sessionKey);
  75         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  76                 CFNumberRef     sessionNum;
  77
  78                 if (needsNotification == NULL)
  79                         needsNotification = CFSetCreateMutable(NULL,
  80                                                                0,
  81                                                                &kCFTypeSetCallBacks);
  82
  83                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  84                 CFSetAddValue(needsNotification, sessionNum);
  85                 CFRelease(sessionNum);
  86         }
  87
  88         return kSCStatusOK;
  89 }
  90
  91
  92 kern_return_t
  93 _notifyviafd(mach_port_t                server,
  94              xmlData_t                  pathRef,
  95              mach_msg_type_number_t     pathLen,
  96              int                        identifier,
  97              int                        *sc_status
  98 )
  99 {
 100         kern_return_t           status;
 101         serverSessionRef        mySession = getSession(server);
 102         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 103         struct sockaddr_un      un;
 104         int                     sock;
 105         int                     bufSiz  = sizeof(storePrivate->notifyFileIdentifier);
 106         int                     nbioYes = 1;
 107
 108         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Send message via UNIX domain socket when a notification key changes."));
 109         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  server = %d"), server);
 110         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  path   = %s"), pathRef);
 111
 112         /*
 113          * if socket currently open, close it!
 114          */
 115         /* validate the UNIX domain socket path */
 116         if (pathLen > (sizeof(un.sun_path) - 1)) {
 117                 SCLog(_configd_verbose, LOG_NOTICE, CFSTR("domain socket path length too long!"));
 118                 status = vm_deallocate(mach_task_self(), (vm_address_t)pathRef, pathLen);
 119                 if (status != KERN_SUCCESS) {
 120                         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("vm_deallocate(): %s"), mach_error_string(status));
 121                         /* non-fatal???, proceed */
 122                 }
 123                 *sc_status = kSCStatusFailed;
 124                 return KERN_SUCCESS;
 125         }
 126
 127         /* un-serialize the UNIX domain socket path */
 128         un.sun_family = AF_UNIX;
 129         bcopy(pathRef, un.sun_path, pathLen);
 130         un.sun_path[pathLen] = '\0';
 131         status = vm_deallocate(mach_task_self(), (vm_address_t)pathRef, pathLen);
 132         if (status != KERN_SUCCESS) {
 133                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("vm_deallocate(): %s"), mach_error_string(status));
 134                 /* non-fatal???, proceed */
 135         }
 136
 137         /* do common sanity checks, get socket */
 138         *sc_status = __SCDynamicStoreNotifyFileDescriptor(mySession->store, identifier, &sock);
 139
 140         /* check status of __SCDynamicStoreNotifyFileDescriptor() */
 141         if (*sc_status != kSCStatusOK) {
 142                 return KERN_SUCCESS;
 143         }
 144
 145         /* establish the connection, get ready for a read() */
 146         if (connect(sock, (struct sockaddr *)&un, sizeof(un)) == -1) {
 147                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("connect: %s"), strerror(errno));
 148                 (void) close(sock);
 149                 storePrivate->notifyStatus = NotifierNotRegistered;
 150                 storePrivate->notifyFile   = -1;
 151                 *sc_status = kSCStatusFailed;
 152                 return KERN_SUCCESS;
 153         }
 154
 155         SCLog(_configd_verbose, LOG_NOTICE, CFSTR("  fd     = %d"), sock);
 156         (void) unlink(un.sun_path);
 157
 158         if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &bufSiz, sizeof(bufSiz)) < 0) {
 159                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("setsockopt: %s"), strerror(errno));
 160                 (void) close(sock);
 161                 *sc_status = kSCStatusFailed;
 162                 return KERN_SUCCESS;
 163         }
 164
 165         if (ioctl(sock, FIONBIO, &nbioYes) == -1) {
 166                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("ioctl(,FIONBIO,): %s"), strerror(errno));
 167                 (void) close(sock);
 168                 *sc_status = kSCStatusFailed;
 169                 return KERN_SUCCESS;
 170         }
 171
 172         /* set notifier active */
 173         storePrivate->notifyStatus         = Using_NotifierInformViaFD;
 174         storePrivate->notifyFile           = sock;
 175         storePrivate->notifyFileIdentifier = identifier;
 176
 177         return KERN_SUCCESS;
 178 }