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iOS安全–不同平台的崩溃收集

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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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