I have written a small tcp-client/server-thing for testing the xperf-networkttrace capabilities.
But as it seems I did do something wrong with xperf.
When I use the Xperf kernel group NETWORK or DIAG+NETWORKTRACE it just shows me the "casual" stuff and nothin about tcp/udp-reads and writes...
Anyone got an clue of how to get these information from xperf?
(did not find anything really helpful via google)
I found out, that the send and receive-actions are logged under the "Generic Events" section, as marks.
You can also find them "easily" if You post-process the etl-log into a human readable file and search for TCPRead/Write UDPRead/Write TCPDisconnect/Connect/Accept etc...
Related
I have a few complex classes generated by a third party domain-specific tool. The classes are complex because the tool tries to be generic as much as possible, so that I was asked to design a GDB pretty printer python script to improve the debugging experience.
I designed it by "to_string" APIs which can print the information with organized rich text (e.g. colors), so far everything works fine.
However, I don't know how to get the output format user requests, no matter that user uses "p" or "p/x" will all output the same string because my script does not know user wants hex rather than decimal.
I tried googling but didn't figure out an elegant approach. I indeed have a few workarounds but they all change the usages (for example, implement two printers to be switched), please give me some suggestions, thank you.
Just realized there had been a feature request to GDB already.
Bug 17291 - IWBN if the print format was available to pretty-printers.
I'm building a barebones Notepad-styled project (console-based, does not have a GUI as of now) and I'd like to track, display (and later use it in some ways) the number of times the console application has been launched. I don't know if this helps, but I'm building my console application on Windows 10, but I'd like it to run on Windows 7+ as well as on Linux distros such as Ubuntu and the like.
I prefer not storing the details in a file and then subsequently reading from it to maintain count. Please suggest a way or any other resource that details how to do this.
I'd put a strikethrough on my quote above, but SO doesn't have it apparently.
Note that this is my first time building such a project so I may not be familiar with advanced stuff... So, when you're answering please try to explain as is required for a not-so-experienced software developer.
Thanks & Have a great one!
Edit: It seems that the general advice is to use text files to protect portability and to account for the fact that if down-the-line, I need to store some extra info, the text file will come in super handy. In light of this, I'll focus my efforts on the text file.
Thanks to all for keeping my efforts from de-railing!
I prefer not storing the details in a file
In the comments, you wrote that the reason is security and you consider using a file as "over-kill" in this case.
Security can be solved easily - just encrypt the file. You can use a library like this to get it done.
In addition, since you are writing and reading to/from the file only once each time the application is opened/closed, and the file should take only small number of bytes to store such data, I think it's the right, portable solution.
If you still don't want to use a file, you can use windows registry to store the data, but this solution is not portable
Well, I want to make a little console application that can get the weather and all its stats to show up in a little box, and I need to get this from a website, I'm thinking something like weather.com, and I need to do it in C++. I need it to simply grab some weather stats from the site and post them in a list on the console screen, in real time, or at least with a refresh button. Is this even possible or do I need to learn some java to do this?
Try feeds from news channel. Or popular Yahoo website API FOR WHETHER
Hey APIs are not in C or C++ specific(with some exception). You can directly download webpage where you can see whether report. Then press F12 & find under which HTML tag it lies. Then open that web page using socket API. THIS IS JUST SINGLE LINE CODE. for finding that tag you need string functions. Then copy & paste work. Also use threads to update time & date & obviously whether report.
I have an application which has nothing to do with the weather.. however those customers are interested in seeing the weather in a box just like the person who asked for this... in worse case I will call a bash script curl wttr.in and translate the output to nice graphics from Oxygene icons at iconarchive.com.
Who has a better solution?
Is there an open source service that I can call from a program, where it passes information about a un-tagged mp3, and it responds with details about the song(e.g. artist, album, track, etc.)? If not, is there an alternative I can use to identify songs?
MusicBrainz is one that works pretty well. It uses an "acoustic fingerprint" to look up potential matches.
AcoustID is an open source fingerprint system that matches fingerprints with data from MusicBrainz
See http://musicbrainz.org/doc/Fingerprinting for details and a list of other figerprinting systems.
I'm trying to write a chat client for a popular network. The original client is proprietary, and is about 15 GB larger than I would like. (To be fair, others call it a game.)
There is absolutely no documentation available for the protocol on the internet, and most search results only come back with the client's scripting interface. I can understand that, since used in the wrong way, it could lead to ruining other people's experience.
I've downloaded the source code of a couple of alternative servers, including the one I want to connect to, but those
contain no documentation other than install instructions
are poorly commented (I did a superficial browsing)
are HUGE (the src folder of the target server contains 12 MB worth of .cpp and .h files), and grep didn't find anything related
I've also tried searching their forums and contacting the maintainers of the server, but so far, no luck.
Packet sniffing isn't likely to help, as the protocol relies heavily on encryption.
At this point, all my hope is my ability to chew through an ungodly amount of code. How do I start?
Edit: A related question.
If your original code is encrypted with some well known library like OpenSSL or Ctypto++ it might be useful to write your wrapper for the main entry points of these libraries, then delagating the call to the actual library. If you make such substitution and build the project successfully, you will be able to trace everything which goes out in the plain text way.
If your project is not using third party encryption libs, hopefully it is still possible to substitute the encryption routines with some wrappers which trace their input and then delegate encryption to the actual code.
Your bet is that usually enctyption is implemented in separate, relatively small number of source files so that should be easier for you to track input/output in these files.
Good luck!
I'd say
find the command that is used to send data through the socket (the call depends on the network library)
find references of this command and unroll from there. If you can modify-recompile the server code, it might help.
On the way, you will be able to log decrypted (or, more likely, not yet encrypted) network activity.
IMO, the best answer is to read the source code of the alternative server. Try using a good C++ IDE to help you. It will make a lot of difference.
It is likely that the protocol related material you need to understand will be limited to a subset of the files. These will contain references to network sockets and things. Start from there and work outwards as far as you need to.
A viable approach is to tackle this as a crypto challenge. That makes it easy, because you control so much.
For instance, you can use a current client to send a known message to the server, and then check server memory for that string. Once you've found out in which object the string ends, it also becomes possible to trace its ancestry through the code. Set a breakpoint on any non-const method of the object, and find the stacktraces. This gives you a live view of how messages arrive at the server, and a list of core functions essential to message processing. You can next find related functions (caller/callee of the functions on your list).