cdsa/cdsa_utilities/machrunloopserver.cpp

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 //
  20 // machrunloopserver - C++ shell for writing Mach 3 servers called by CFRunLoop
  21 //
  22 #include "machrunloopserver.h"
  23 #include <Security/cfutilities.h>
  24 #include <mach/mach_error.h>
  25 #include <Security/debugging.h>
  26
  27
  28 namespace Security {
  29 namespace MachPlusPlus {
  30
  31
  32 //
  33 // Generic Mach server
  34 //
  35 MachRunLoopServer::MachRunLoopServer(const char *name) : MachServer(name)
  36 {
  37 }
  38
  39 MachRunLoopServer::MachRunLoopServer(const char *name, const Bootstrap &boot)
  40 : MachServer(name, boot)
  41 {
  42 }
  43
  44 void MachRunLoopServer::run(size_t bufferSize, mach_msg_options_t options)
  45 {
  46         // allocate reply buffer (well, try)
  47         replyBuffer = CssmAllocator::standard().malloc<mach_msg_header_t>(bufferSize);
  48
  49         // Now do the CFRunLoop tango...
  50         runLoop = CFRunLoopGetCurrent();
  51         CFRef<CFMachPortRef> cfPort = CFMachPortCreateWithPort(NULL, mServerPort, cfCallback,
  52         NULL, NULL);
  53         runLoopSource =
  54                 CFMachPortCreateRunLoopSource(NULL, cfPort, 10);        //@@@ no idea what order is good
  55         if (!runLoop || !runLoopSource || !cfPort)
  56                 CssmError::throwMe(CSSM_ERRCODE_INTERNAL_ERROR);        //@@@ $#!!& CF non-diagnostics!
  57         CFRunLoopAddSource(runLoop, runLoopSource, kCFRunLoopDefaultMode);
  58
  59         // we are it!
  60         perThread().server = this;
  61 }
  62
  63 MachRunLoopServer::~MachRunLoopServer()
  64 {
  65         // remove our runloop source
  66         CFRunLoopRemoveSource(runLoop, runLoopSource, kCFRunLoopDefaultMode);
  67         CFRelease(runLoopSource);
  68
  69         // delete the reply buffer
  70         CssmAllocator::standard().free(replyBuffer);
  71
  72     // no longer tagged
  73     perThread().server = NULL;
  74
  75         // our MachServer parent class will clean up the ports and deregister from our bootstrap
  76 }
  77
  78
  79 //
  80 // Block/unblock new request reception to serialize the request queue
  81 //
  82 void MachRunLoopServer::blockNewRequests(bool block)
  83 {
  84         if (block) {
  85                 CFRunLoopRemoveSource(runLoop, runLoopSource, kCFRunLoopDefaultMode);
  86                 debug("machsrv", "disabled request reception");
  87         } else {
  88                 CFRunLoopAddSource(runLoop, runLoopSource, kCFRunLoopDefaultMode);
  89                 debug("machsrv", "enabled request reception");
  90         }
  91 }
  92
  93
  94 //
  95 // Add secondary ports to receive on
  96 //
  97 void MachRunLoopServer::alsoListenOn(Port port)
  98 {
  99         CFRef<CFMachPortRef> cfPort = CFMachPortCreateWithPort(NULL, port, cfCallback,
 100         NULL, NULL);
 101         CFRef<CFRunLoopSourceRef> source =
 102                 CFMachPortCreateRunLoopSource(NULL, cfPort, 10);        //@@@ no idea what order is good
 103         CFRunLoopAddSource(runLoop, source, kCFRunLoopDefaultMode);
 104         debug("machsrv", "also receiving from port %d", port.port());
 105 }
 106
 107 void MachRunLoopServer::stopListenOn(Port port)
 108 {
 109         CFRef<CFMachPortRef> cfPort = CFMachPortCreateWithPort(NULL, port, cfCallback,
 110         NULL, NULL);
 111         CFRef<CFRunLoopSourceRef> source =
 112                 CFMachPortCreateRunLoopSource(NULL, cfPort, 10);        //@@@ no idea what order is good
 113         CFRunLoopRemoveSource(runLoop, source, kCFRunLoopDefaultMode);
 114         debug("machsrv", "no longer receiving from port %d", port.port());
 115 }
 116
 117
 118 //
 119 // Handle dead-port notifications.
 120 // Since we don't actually run our own runloop here, we can't well use standard
 121 // notifications to our own server port. So we use a CFMachPort facility instead.
 122 //
 123 void MachRunLoopServer::notifyIfDead(Port port) const
 124 {
 125         //@@@ not clear how to deal with CFRetainCount of cfPort here
 126         //    will CF clean up the cfPort when it dies? Or do we have to keep a set?
 127         CFMachPortRef cfPort = CFMachPortCreateWithPort(NULL, port, NULL, NULL, NULL);
 128         CFMachPortSetInvalidationCallBack(cfPort, cfInvalidateCallback);
 129 }
 130
 131 void MachRunLoopServer::cfInvalidateCallback(CFMachPortRef cfPort, void *)
 132 {
 133         active().notifyDeadName(CFMachPortGetPort(cfPort));
 134 }
 135
 136
 137 //
 138 // The callback triggered from CFRunLoop
 139 //
 140 void MachRunLoopServer::cfCallback(CFMachPortRef port, void *msg, CFIndex, void *)
 141 {
 142         active().oneRequest(reinterpret_cast<mach_msg_header_t *>(msg));
 143 }
 144
 145 void MachRunLoopServer::oneRequest(mach_msg_header_t *request)
 146 {
 147         if (!handle(request, replyBuffer)) {
 148                 // MIG dispatch did not recognize the request. Ignore/Retry/Fail? :-)
 149                 //@@@ Should send an error reply back here, I suppose. Later...
 150                 debug("machrls", "MachRunLoopServer dispatch failed");
 151                 return;
 152         }
 153
 154         // MIG dispatch handled the call. Send reply back to caller.
 155         // This boilerplate stolen from mach_msg_server, since MIG can't seem to
 156         // generate send-only code for replies (without explicit simpleroutines).
 157         if (kern_return_t err = mach_msg_overwrite(replyBuffer,
 158                 (MACH_MSGH_BITS_REMOTE(replyBuffer->msgh_bits) == MACH_MSG_TYPE_MOVE_SEND_ONCE) ?
 159                 MACH_SEND_MSG : MACH_SEND_MSG|MACH_SEND_TIMEOUT,
 160                 replyBuffer->msgh_size, 0, MACH_PORT_NULL,
 161                 0, MACH_PORT_NULL, (mach_msg_header_t *) 0, 0)) {
 162                 //@@@ should at least clean up resources here, I suppose.
 163                 debug("machsrv", "RunloopServer cannot post reply: %s", mach_error_string(err));
 164                 active().releaseDeferredAllocations();
 165                 return;
 166         }
 167         active().releaseDeferredAllocations();
 168         return;
 169 }
 170
 171
 172 } // end namespace MachPlusPlus
 173 } // end namespace Security