SEARCH KEYWORD -- Trick
Can we believe our eyes?
Several days ago, one of our customers submitted a sample (SHA1: fbe71968d4c5399c2906b56d9feadf19a35beb97, detected as TrojanDropper:Win32/Vundo.L). This trojan hijacks the hosts “vk.com†and “vkontakte.ru†(both social networking sites in Russia)and redirects them to 92.38.209.252, but achieves this in an unusual way. A common method used to hijack a website and redirect it to a site of the attacker’s choice is to add an entry in the Windows hosts f...
Interaction between JavaScript and Frameset
ou want to change more than one frame at a time? OK, well here is how to do make the trick work for you! The first thing you will need is a frameset to get you started. Again, I will use a frameset with two frames. Here is the code for the frameset page: <HTML> <HEAD> <TITLE>Frames Example 5</TITLE> </HEAD> <FRAMESET cols=\"20%,80%\"> <FRAME SRC=\"page1.htm\" name=\"left_frame\"> <FRAME SRC=\"page2.htm\" name=\"right_frame\"> </FRAMESET> <...
interaction,javascript,html,frameset,fra 2011-03-22 12:50:47
A small trick on using console.log to print data in JavaScript
When debugging JavaScript application, one may frequently use console.log to print data so that it is easy to debug when issue occurs and also helps on understand the data flow. The common way of printing a variable would be something like. let user = { name: "test" }; console.log(user); In this case it will print: { name: 'test' } This is OK when there is no much logging or the program is not complicated. But it becomes difficult to debug if there are lots of variables to be printed ...
JAVASCRIPT,CONSOLE.LOG,DEBUGGING 2019-09-03 10:24:24
How to do pprof for gRPC service
gRPC is a RPC framework based on HTTP and is frequently used for communications among micro service inside the same organization network. However, the service functions cannot be accessed via normal HTTP URL as it's not a WEB framework. In this case, how to do pprof on a gRPC service? The trick is starting a HTTP server asynchronously while starting the gRPC service. This HTTP server can be accessed to run prrof debug. go func(){ http.ListenAndServe(":10001", nil) }() Since it uses the de...
Implement struct no copy in GoLang
There is some case where some of the struct in GoLang which is not meant to be copied. For example, sometimes a global configuration which should have only one version passed around the whole application and should not be copied and modified. In GoLang, there is no intuitive solution on preventing copying of struct. But there is still some way which can be leveraged to help prevent this while developing the code. The trick is to define some struct implementing sync.Locker interface and has this ...
Preprocessor magic:Default Arguments in C
This post is for programmers who like C or for one reason or another can't use anything else but C in one of their projects. The advantages of having default arguments is not something that needs convincing. It's just very nice and convenient to have them. C++ offers the ability to define them but C under the C99 standard has no way to allow it. In this post I will detail two ways I know of implementing default arguments in C. If a reader happens to know additional ways please share in ...
C,Preprocessor,Default arguments 2012-02-19 06:17:04
Do you have this kind of comments in your source code?
Writing runnable code is the essential skill of a programmer, writing understandable comment is also a skill a programmer should acquire. There is some famous saying that bad comment is worth than no comment. Usually your code will be maintained by other people, if you provide them some difficult to understand or misguided comments, this will be nightmare to them. While at some other time, programmers may put some funny comments in their codes which may make others laugh. Today we...
A trick of building multithreaded application on Solaris
Firstly, Let’s see a simple multithreaded application: #include <stdio.h> #include <pthread.h> #include <errno.h> void *thread1_func(void *p_arg) { errno = 0; sleep(3); errno = 1; printf("%s exit, errno is %d\n", (char*)p_arg, errno); } void *thread2_func(void *p_arg) { errno = 0; sleep(5); printf("%s exit, errno is %d\n", (char*)p_arg, errno); } int main(void) { pthread_t t1, t2; ...
Magic CSS shape
There is a question on StackOverflow which states that someone finds a CSS sample on http://css-tricks.com/examples/ShapesOfCSS/ , the sample shows a triangle created with pure CSS. The source code is :#triangle-up {width: 0;height: 0;border-left: 50px solid transparent;border-right: 50px solid transparent;border-bottom: 100px solid red;}The question is how these few lines can create a triangle? Next we give the answer and the detail illustration to this question We need to consider the B...
The magic of go:linkname
When writing Go program, there is frequent need on using time.Sleep() function to pause the logic for some time. And if jumping to the definition of this function, can see below definition: // Sleep pauses the current goroutine for at least the duration d. // A negative or zero duration causes Sleep to return immediately. func Sleep(d Duration) I's strange that there is no function body defined here. What happened? The actual definition of the function body is residing at runtime/time.go&nb...
TRICKS,GO:LINKNAME,GOLANG 2022-04-10 08:39:00
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