File: XPCServiceMain.Development.mm

package info (click to toggle)
qtwebkit-opensource-src 5.7.1%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 291,692 kB
  • ctags: 268,122
  • sloc: cpp: 1,360,420; python: 70,286; ansic: 42,986; perl: 35,476; ruby: 12,236; objc: 9,465; xml: 8,396; asm: 3,873; yacc: 2,397; sh: 1,647; makefile: 650; lex: 644; java: 110
file content (168 lines) | stat: -rw-r--r-- 7,001 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#import <crt_externs.h>
#import <dlfcn.h>
#import <mach-o/dyld.h>
#import <spawn.h> 
#import <stdio.h>
#import <stdlib.h>
#import <xpc/xpc.h>

namespace WebKit {

struct ReexecInfo {
    bool executableHeap;
    char** environment;
    cpu_type_t cpuType;
};

static NO_RETURN void reexec(ReexecInfo *info)
{
    posix_spawnattr_t attr;
    posix_spawnattr_init(&attr);

    short flags = 0;

    // We just want to set the process state, not actually launch a new process,
    // so we are going to use the darwin extension to posix_spawn POSIX_SPAWN_SETEXEC
    // to act like a more full featured exec.
    flags |= POSIX_SPAWN_SETEXEC;

    sigset_t signalMaskSet;
    sigemptyset(&signalMaskSet);
    posix_spawnattr_setsigmask(&attr, &signalMaskSet);
    flags |= POSIX_SPAWN_SETSIGMASK;

    static const int allowExecutableHeapFlag = 0x2000;
    if (info->executableHeap)
        flags |= allowExecutableHeapFlag;

    posix_spawnattr_setflags(&attr, flags);

    size_t outCount = 0;
    posix_spawnattr_setbinpref_np(&attr, 1, &info->cpuType, &outCount);

    char path[4 * PATH_MAX];
    uint32_t pathLength = sizeof(path);
    _NSGetExecutablePath(path, &pathLength);

    char** argv = *_NSGetArgv();
    const char* programName = argv[0];
    const char* args[] = { programName, 0 };

    pid_t processIdentifier = 0;
    posix_spawn(&processIdentifier, path, 0, &attr, const_cast<char**>(args), info->environment);

    posix_spawnattr_destroy(&attr);

    NSLog(@"Unable to re-exec for path: %s", path);
    exit(EXIT_FAILURE);
}

static NO_RETURN void reexecCallBack(CFRunLoopTimerRef timer, void *info)
{
    reexec(static_cast<ReexecInfo *>(info));
}

static void XPCServiceEventHandler(xpc_connection_t peer)
{
    xpc_connection_set_target_queue(peer, dispatch_get_main_queue());
    xpc_connection_set_event_handler(peer, ^(xpc_object_t event) {
        xpc_type_t type = xpc_get_type(event);
        if (type == XPC_TYPE_ERROR) {
            if (event == XPC_ERROR_CONNECTION_INVALID || event == XPC_ERROR_TERMINATION_IMMINENT) {
                // FIXME: Handle this case more gracefully.
                exit(EXIT_FAILURE);
            }
        } else {
            assert(type == XPC_TYPE_DICTIONARY);

            if (!strcmp(xpc_dictionary_get_string(event, "message-name"), "re-exec")) {
                ReexecInfo *info = static_cast<ReexecInfo *>(malloc(sizeof(ReexecInfo)));

                info->executableHeap = xpc_dictionary_get_bool(event, "executable-heap");
                info->cpuType = (cpu_type_t)xpc_dictionary_get_uint64(event, "architecture");

                xpc_object_t environmentArray = xpc_dictionary_get_value(event, "environment");
                size_t numberOfEnvironmentVariables = xpc_array_get_count(environmentArray);
                char** environment = static_cast<char **>(malloc(numberOfEnvironmentVariables * sizeof(char*) + 1));
                for (size_t i = 0; i < numberOfEnvironmentVariables; ++i)
                    environment[i] = strdup(xpc_array_get_string(environmentArray, i));
                environment[numberOfEnvironmentVariables] = 0;
                info->environment = environment;

                CFRunLoopTimerContext context = { 0, info, NULL, NULL, NULL };
                CFRunLoopTimerRef timer = CFRunLoopTimerCreate(NULL, CFAbsoluteTimeGetCurrent(), 0, 0, 0, reexecCallBack, &context);
                CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes);
            }

            if (!strcmp(xpc_dictionary_get_string(event, "message-name"), "bootstrap")) {
                static void* frameworkLibrary = dlopen(xpc_dictionary_get_string(event, "framework-executable-path"), RTLD_NOW);
                if (!frameworkLibrary) {
                    NSLog(@"Unable to load WebKit2.framework at path: %s (Error: %s)", xpc_dictionary_get_string(event, "framework-executable-path"), dlerror());
                    exit(EXIT_FAILURE);
                }

                CFBundleRef webKit2Bundle = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.WebKit2"));
                CFStringRef entryPointFunctionName = (CFStringRef)CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(), CFSTR("WebKitEntryPoint"));

                typedef void (*InitializerFunction)(xpc_connection_t, xpc_object_t);
                InitializerFunction initializerFunctionPtr = reinterpret_cast<InitializerFunction>(CFBundleGetFunctionPointerForName(webKit2Bundle, entryPointFunctionName));
                if (!initializerFunctionPtr) {
                    NSLog(@"Unable to find entry point in WebKit2.framework with name: %@", (NSString *)entryPointFunctionName);
                    exit(EXIT_FAILURE);
                }

                xpc_object_t reply = xpc_dictionary_create_reply(event);
                xpc_dictionary_set_string(reply, "message-name", "process-finished-launching");
                xpc_connection_send_message(xpc_dictionary_get_remote_connection(event), reply);
                xpc_release(reply);

                dup2(xpc_dictionary_dup_fd(event, "stdout"), STDOUT_FILENO);
                dup2(xpc_dictionary_dup_fd(event, "stderr"), STDERR_FILENO);

                initializerFunctionPtr(peer, event);
            }

            if (!strcmp(xpc_dictionary_get_string(event, "message-name"), "pre-bootstrap")) {
                // Hold on to the pre-bootstrap message.
                xpc_retain(event);
            }
        }
    });

    xpc_connection_resume(peer);
}

} // namespace WebKit;

using namespace WebKit;

int main(int argc, char** argv)
{
    xpc_main(XPCServiceEventHandler);
    return 0;
}