Security-55163.44.tar.gz

[apple/security.git] / libsecurity_utilities / lib / powerwatch.cpp

diff --git a/libsecurity_utilities/lib/powerwatch.cpp b/libsecurity_utilities/lib/powerwatch.cpp
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+/*
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+//
+// powerwatch - hook into system notifications of power events
+//
+#include "powerwatch.h"
+#include <IOKit/IOMessage.h>
+
+
+namespace Security {
+namespace MachPlusPlus {
+
+
+//
+// The obligatory empty virtual destructor
+//
+PowerWatcher::~PowerWatcher()
+{ }
+
+
+//
+// The default NULL implementations of the callback virtuals.
+// We define these (rather than leaving them abstract) since
+// many users want only one of these events.
+//
+void PowerWatcher::systemWillSleep()
+{ }
+
+void PowerWatcher::systemIsWaking()
+{ }
+
+void PowerWatcher::systemWillPowerDown()
+{ }
+
+void PowerWatcher::systemWillPowerOn()
+{ }
+
+//
+// IOPowerWatchers
+//
+
+void
+IOPowerWatcher::iopmcallback(void *                            param, 
+                            IOPMConnection                    connection,
+                            IOPMConnectionMessageToken        token, 
+                            IOPMSystemPowerStateCapabilities   capabilities)
+{
+    IOPowerWatcher *me = (IOPowerWatcher *)param;
+
+    if (SECURITY_DEBUG_LOG_ENABLED()) {
+       secdebug("powerwatch", "powerstates");
+       if (capabilities & kIOPMSystemPowerStateCapabilityDisk)
+           secdebug("powerwatch", "disk");
+       if (capabilities & kIOPMSystemPowerStateCapabilityNetwork)
+           secdebug("powerwatch", "net");
+       if (capabilities & kIOPMSystemPowerStateCapabilityAudio) 
+           secdebug("powerwatch", "audio");
+       if (capabilities & kIOPMSystemPowerStateCapabilityVideo)
+           secdebug("powerwatch", "video");
+    }
+
+    /* if cpu and no display -> in DarkWake */
+    if ((capabilities & (kIOPMSystemPowerStateCapabilityCPU|kIOPMSystemPowerStateCapabilityVideo)) == kIOPMSystemPowerStateCapabilityCPU) {
+        secdebug("powerwatch", "enter DarkWake");
+       me->mInDarkWake = true;
+    } else if (me->mInDarkWake) {
+        secdebug("powerwatch", "exit DarkWake");
+       me->mInDarkWake = false;
+    }
+
+    (void)IOPMConnectionAcknowledgeEvent(connection, token);
+
+    return;
+}
+
+
+void
+IOPowerWatcher::setupDarkWake()
+{
+    IOReturn            ret;
+    
+    mInDarkWake = false;
+
+    mIOPMqueue = dispatch_queue_create("com.apple.security.IOPowerWatcher", NULL);
+    if (mIOPMqueue == NULL)
+       return;
+
+    ret = ::IOPMConnectionCreate(CFSTR("IOPowerWatcher"),
+                                kIOPMSystemPowerStateCapabilityDisk 
+                                | kIOPMSystemPowerStateCapabilityNetwork
+                                | kIOPMSystemPowerStateCapabilityAudio 
+                                | kIOPMSystemPowerStateCapabilityVideo,
+                                &mIOPMconn);
+    if (ret != kIOReturnSuccess)
+       return;
+       
+    ret = ::IOPMConnectionSetNotification(mIOPMconn, this,
+                                         (IOPMEventHandlerType)iopmcallback);
+    if (ret != kIOReturnSuccess)
+       return;
+
+    ::IOPMConnectionSetDispatchQueue(mIOPMconn, mIOPMqueue);
+}
+
+IOPowerWatcher::IOPowerWatcher()
+{
+    if (!(mKernelPort = ::IORegisterForSystemPower(this, &mPortRef, ioCallback, &mHandle)))
+        UnixError::throwMe(EINVAL);    // no clue
+
+       setupDarkWake();
+}
+
+IOPowerWatcher::~IOPowerWatcher()
+{
+       if (mKernelPort)
+               ::IODeregisterForSystemPower(&mHandle);
+
+       if (mIOPMconn) {
+               ::IOPMConnectionSetDispatchQueue(mIOPMconn, NULL);
+               ::IOPMConnectionRelease(mIOPMconn);
+       }
+       if (mIOPMqueue)
+               ::dispatch_release(mIOPMqueue);
+}
+
+
+//
+// The callback dispatcher
+//
+void IOPowerWatcher::ioCallback(void *refCon, io_service_t service,
+    natural_t messageType, void *argument)
+{
+    IOPowerWatcher *me = (IOPowerWatcher *)refCon;
+    enum { allow, refuse, ignore } reaction;
+    switch (messageType) {
+    case kIOMessageSystemWillSleep:
+        secdebug("powerwatch", "system will sleep");
+        me->systemWillSleep();
+        reaction = allow;
+        break;
+    case kIOMessageSystemHasPoweredOn:
+        secdebug("powerwatch", "system has powered on");
+        me->systemIsWaking();
+        reaction = ignore;
+        break;
+    case kIOMessageSystemWillPowerOff:
+        secdebug("powerwatch", "system will power off");
+        me->systemWillPowerDown();
+        reaction = allow;
+        break;
+    case kIOMessageSystemWillNotPowerOff:
+        secdebug("powerwatch", "system will not power off");
+        reaction = ignore;
+        break;
+    case kIOMessageCanSystemSleep:
+        secdebug("powerwatch", "can system sleep");
+        reaction = allow;
+        break;
+    case kIOMessageSystemWillNotSleep:
+        secdebug("powerwatch", "system will not sleep");
+        reaction = ignore;
+        break;
+    case kIOMessageCanSystemPowerOff:
+        secdebug("powerwatch", "can system power off");
+        reaction = allow;
+        break;
+       case kIOMessageSystemWillPowerOn:
+        secdebug("powerwatch", "system will power on");
+               me->systemWillPowerOn();
+        reaction = ignore;
+        break;
+    default:
+        secdebug("powerwatch",
+            "type 0x%x message received (ignored)", messageType);
+        reaction = ignore;
+        break;
+    }
+    
+    // handle acknowledgments
+    switch (reaction) {
+    case allow:
+               secdebug("powerwatch", "calling IOAllowPowerChange");
+        IOAllowPowerChange(me->mKernelPort, long(argument));
+        break;
+    case refuse:
+               secdebug("powerwatch", "calling IOCancelPowerChange");
+        IOCancelPowerChange(me->mKernelPort, long(argument));
+        break;
+    case ignore:
+               secdebug("powerwatch", "sending no response");
+        break;
+    }
+}
+
+
+//
+// The MachServer hookup
+//
+PortPowerWatcher::PortPowerWatcher()
+{
+    port(IONotificationPortGetMachPort(mPortRef));
+}
+
+boolean_t PortPowerWatcher::handle(mach_msg_header_t *in)
+{
+    IODispatchCalloutFromMessage(NULL, in, mPortRef);
+    return TRUE;
+}
+
+
+} // end namespace MachPlusPlus
+
+} // end namespace Security