iOS安全–不同平台的崩溃收集

发布的app难免会出现一些奇葩的bug,为了能够实时跟踪app的崩溃,需要接管系统的异常捕获接口,自己来收集保存崩溃现场信息。

下面简单说一下几个平台的异常崩溃捕获。

1.iOS

1.1 Exception

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-(BOOL)install{
    if(NSGetUncaughtExceptionHandler() != custom_exceptionHandler)
        oldhandler = NSGetUncaughtExceptionHandler();
   
    if(self->_handlerEnable){
        NSSetUncaughtExceptionHandler(&custom_exceptionHandler);
    }else{
        DDLogWarning(@"NSEXception handler disable");
    }
    return YES;
}

-(BOOL)uninstall{
    NSSetUncaughtExceptionHandler(oldhandler);
    return YES;
}

1.2 Signal

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-(BOOL)install{
    if(installed){
        DDLogError(@"signal handler has been installed");
        return NO;
    }
   
    custom_crash_stk.ss_size = MAX(MINSIGSTKSZ, 64*1024);
    custom_crash_stk.ss_sp = malloc(custom_crash_stk.ss_size);
    custom_crash_stk.ss_flags = 0;
   
    if(custom_crash_stk.ss_sp == NULL){
        return NO;
    }
   
    //替换信号处理函数栈,避免栈已经耗尽,导致进程退出
    if(sigaltstack(&custom_crash_stk, 0) < 0)
        return NO;
   
    if(!sa_preHandlers){
        sa_preHandlers = (struct sigaction*)malloc(sizeof(struct sigaction) * monitored_signals_count);
        memset(sa_preHandlers, 0, sizeof(struct sigaction) * monitored_signals_count);
    }
   
    struct sigaction sa;
    memset(&sa, 0, sizeof(sa));
    sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
    sigemptyset(&sa.sa_mask);
    sa.sa_sigaction = &custom_signalHandler;
   
    for (int i = 0; i < monitored_signals_count; i++) {
        if(sigaction(monitored_signals[i], &sa, (struct sigaction*)(sa_preHandlers+i)) != 0){
            DDLogError(@"install signalHandler failed, uninstall it!");
            [self uninstall];
            return NO;
        }
    }
   
    installed = 1;
   
    return YES;
}

-(BOOL)uninstall{
    if(installed){
        if(custom_crash_stk.ss_sp){
            free(custom_crash_stk.ss_sp);
            custom_crash_stk.ss_sp = nil;
        }
       
        for (int i = 0; i < monitored_signals_count; i++) {
            if(sigaction(monitored_signals[i], (struct sigaction*)(sa_preHandlers+i), 0) != 0){
                return NO;
            }
        }
       
        if(sa_preHandlers)
            free(sa_preHandlers);
       
        installed = 0;
       
        return YES;
    }else{
        DDLogError(@"signalHandler already uninstalled!");
        return NO;
    }
}

2.Cocos

2.1 Cocos-Lua

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local function handleLuaException(msg)
    if msg==nil then return end

    local targetPlatform = cc.Application:getInstance():getTargetPlatform()
    local supportObjectCBridge  = false
    if (cc.PLATFORM_OS_IPHONE == targetPlatform) or (cc.PLATFORM_OS_IPAD == targetPlatform) or (cc.PLATFORM_OS_MAC == targetPlatform)  then
        supportObjectCBridge = true
    end

    local supportJavaBridge = false
    if (cc.PLATFORM_OS_ANDROID == targetPlatform) then
        supportJavaBridge = true
    end

    if (supportJavaBridge == true) then
        //...
    elseif (supportObjectCBridge == true) then
        //...
    end
end

function __G__TRACKBACK__(msg)
    handleLuaException(msg)
    return msg
end

2.2 Cocos-JS

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//注册异常处理回调函数
void JSExceptionHandler::registerJSExceptionHandler(JSContext *cx) {
    JS_SetErrorReporter(cx, JSExceptionHandler::reportError);
}

void JSExceptionHandler::reportError(JSContext *cx, const char *message, JSErrorReport *report)
{
    const char* format = "%s:%u:%s\n";
    const char* fileName = report->filename ? report->filename : "no filename";
   
    int bufLen = strlen(format) + strlen(fileName) + strlen(message) + 16;
    char* traceback = (char*)malloc(bufLen);
    memset(traceback, 0, bufLen);
    sprintf(traceback, format, fileName, (unsigned int) report->lineno, message);
   
   
    //....
   
    free(traceback);
};

3.U3D

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//注册未处理异常回调
System.AppDomain.CurrentDomain.UnhandledException += _OnUnhandledExceptionHandler;

//注册日志回调
Application.RegisterLogCallback(_OnLogCallbackHandler);

static private void _OnLogCallbackHandler(string name, string stack, LogType type)
{

     //…
}

private static void _OnUnhandledExceptionHandler(object sender, System.UnhandledExceptionEventArgs args)
{
    if (args.ExceptionObject.GetType() == typeof(System.Exception))
    {
           //…      

    }
}

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