Source/WebKit2/Shared/EntryPointUtilities/mac/XPCService/XPCServiceMain.Development.mm

   1 /*
   2  * Copyright (C) 2013 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #import <crt_externs.h>
  27 #import <dlfcn.h>
  28 #import <mach-o/dyld.h>
  29 #import <spawn.h>
  30 #import <stdio.h>
  31 #import <stdlib.h>
  32 #import <xpc/xpc.h>
  33
  34 namespace WebKit {
  35
  36 static void XPCServiceEventHandler(xpc_connection_t peer)
  37 {
  38     xpc_connection_set_target_queue(peer, dispatch_get_main_queue());
  39     xpc_connection_set_event_handler(peer, ^(xpc_object_t event) {
  40         xpc_type_t type = xpc_get_type(event);
  41         if (type == XPC_TYPE_ERROR) {
  42             if (event == XPC_ERROR_CONNECTION_INVALID || event == XPC_ERROR_TERMINATION_IMMINENT) {
  43                 // FIXME: Handle this case more gracefully.
  44                 exit(EXIT_FAILURE);
  45             }
  46         } else {
  47             assert(type == XPC_TYPE_DICTIONARY);
  48
  49             if (!strcmp(xpc_dictionary_get_string(event, "message-name"), "re-exec")) {
  50                 posix_spawnattr_t attr;
  51                 posix_spawnattr_init(&attr);
  52
  53                 short flags = 0;
  54
  55                 // We just want to set the process state, not actually launch a new process,
  56                 // so we are going to use the darwin extension to posix_spawn POSIX_SPAWN_SETEXEC
  57                 // to act like a more full featured exec.
  58                 flags |= POSIX_SPAWN_SETEXEC;
  59
  60                 sigset_t signalMaskSet;
  61                 sigemptyset(&signalMaskSet);
  62                 posix_spawnattr_setsigmask(&attr, &signalMaskSet);
  63                 flags |= POSIX_SPAWN_SETSIGMASK;
  64
  65                 static const int allowExecutableHeapFlag = 0x2000;
  66                 if (xpc_dictionary_get_bool(event, "executable-heap"))
  67                     flags |= allowExecutableHeapFlag;
  68
  69                 posix_spawnattr_setflags(&attr, flags);
  70
  71                 cpu_type_t cpuTypes[] = { (cpu_type_t)xpc_dictionary_get_uint64(event, "architecture") };
  72                 size_t outCount = 0;
  73                 posix_spawnattr_setbinpref_np(&attr, 1, cpuTypes, &outCount);
  74
  75                 char path[4 * PATH_MAX];
  76                 uint32_t pathLength = sizeof(path);
  77                 _NSGetExecutablePath(path, &pathLength);
  78
  79                 char** argv = *_NSGetArgv();
  80                 const char* programName = argv[0];
  81                 const char* args[] = { programName, 0 };
  82
  83                 xpc_object_t environmentArray = xpc_dictionary_get_value(event, "environment");
  84                 size_t numberOfEnvironmentVariables = xpc_array_get_count(environmentArray);
  85
  86                 const char** environment = (const char**)malloc(numberOfEnvironmentVariables * sizeof(char*) + 1);
  87                 for (size_t i = 0; i < numberOfEnvironmentVariables; ++i)
  88                     environment[i] = xpc_array_get_string(environmentArray, i);
  89                 environment[numberOfEnvironmentVariables] = 0;
  90
  91                 pid_t processIdentifier = 0;
  92                 posix_spawn(&processIdentifier, path, 0, &attr, const_cast<char**>(args), const_cast<char**>(environment));
  93
  94                 posix_spawnattr_destroy(&attr);
  95
  96                 NSLog(@"Unable to re-exec for path: %s", path);
  97                 exit(EXIT_FAILURE);
  98             }
  99
 100             if (!strcmp(xpc_dictionary_get_string(event, "message-name"), "bootstrap")) {
 101                 static void* frameworkLibrary = dlopen(xpc_dictionary_get_string(event, "framework-executable-path"), RTLD_NOW);
 102                 if (!frameworkLibrary) {
 103                     NSLog(@"Unable to load WebKit2.framework at path: %s (Error: %s)", xpc_dictionary_get_string(event, "framework-executable-path"), dlerror());
 104                     exit(EXIT_FAILURE);
 105                 }
 106
 107                 CFBundleRef webKit2Bundle = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.WebKit2"));
 108                 CFStringRef entryPointFunctionName = (CFStringRef)CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(), CFSTR("WebKitEntryPoint"));
 109
 110                 typedef void (*InitializerFunction)(xpc_connection_t, xpc_object_t);
 111                 InitializerFunction initializerFunctionPtr = reinterpret_cast<InitializerFunction>(CFBundleGetFunctionPointerForName(webKit2Bundle, entryPointFunctionName));
 112                 if (!initializerFunctionPtr) {
 113                     NSLog(@"Unable to find entry point in WebKit2.framework with name: %@", (NSString *)entryPointFunctionName);
 114                     exit(EXIT_FAILURE);
 115                 }
 116
 117                 xpc_object_t reply = xpc_dictionary_create_reply(event);
 118                 xpc_dictionary_set_string(reply, "message-name", "process-finished-launching");
 119                 xpc_connection_send_message(xpc_dictionary_get_remote_connection(event), reply);
 120                 xpc_release(reply);
 121
 122                 dup2(xpc_dictionary_dup_fd(event, "stdout"), STDOUT_FILENO);
 123                 dup2(xpc_dictionary_dup_fd(event, "stderr"), STDERR_FILENO);
 124
 125                 initializerFunctionPtr(peer, event);
 126             }
 127         }
 128     });
 129
 130     xpc_connection_resume(peer);
 131 }
 132
 133 } // namespace WebKit;
 134
 135 using namespace WebKit;
 136
 137 int main(int argc, char** argv)
 138 {
 139     xpc_main(XPCServiceEventHandler);
 140     return 0;
 141 }