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WinForms: Errors, Holmes

Reading time17 min
Views1.1K

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We like to search for errors in Microsoft projects. Why? It's simple: their projects are usually easy to check (you can work in Visual Studio environment for which PVS-Studio has a convenient plugin) and they contain few errors. That's why the usual work algorithm is as follows: find and download an open source project from MS; check it; choose interesting errors; make sure there are few of them; write an article without forgetting to praise the developers. Great! Win-win-win: it took a little time, the bosses are glad to see new materials in the blog, and karma is fine. But this time «something went wrong». Let's see what we have found in the source code of Windows Forms and whether we should speak highly of Microsoft this time.
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Citymobil — a manual for improving availability amid business growth for startups. Part 5

Reading time8 min
Views1.1K


This is the final part of the series describing how we’re increasing our service availability in Citymobil (you can read the previous part here). Now I’m going to talk about one more type of outages and the conclusions we made about them, how we modified the development process, what automation we introduced.
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Citymobil — a manual for improving availability amid business growth for startups. Part 1

Reading time4 min
Views1.4K


In this first part of an article series «Citymobil — a manual for improving availability amid business growth for startups» I’m going to break down the way we managed to dramatically scale up the availability of Citymobil services. The article opens with the story about our business, our task, the reason for this task to increase the availability emerged and limitations. Citymobil is a rapid-growing taxi aggregator. In 2018, it increased by more than 15 times in terms of number of successfully completed trips. Some months showed 50% increase compared with the previous month.

The business grew like a weed in every direction (it still does): there was an increase in server load, team size and number of deployments. At the same time the new threats to service availability emerged. The company faced a task of the most importance — how to increase availability without compromising company growth. In this article, I’ll talk about the way we managed to solve this task in a relatively short time.
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BGP perforating wound

Reading time2 min
Views2.4K
It was an ordinary Thursday on 4.04.2019. Except that at some point of the midday timeline an AS60280 belonging to Belarus’ NTEC leaked 18600 prefixes originating from approximately 1400 ASes.

Those routes were taken from the transit provider RETN (AS9002) and further announced to NTEC’s provider — RU-telecom’s AS205540, which, in its turn, accepted all of them, spreading the leak.

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Wireshark 3.x: code analysis under macOS and errors review

Reading time9 min
Views1.9K

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Wireshark Foundation released the final stable-version of the popular network traffic analyzer — Wireshark 3.0.0. The new release fixes several bugs, it is now possible to analyze the new protocols, apart from that the driver on Npcap WinPcap is replaced. Here is where quoting of the announcement ends and our note about bugs in the project starts off. The projects authors definitely haven't done their best in fixing bugs before the release.

Let's collect hotfixes right now to give a motive in doing a new release :).

Introduction


Wireshark is a well-known tool to capture and analyze network traffic. The program works with the vast majority of known protocols, has intuitive and logical graphical interface, an all-powerful system of filters. Wireshark is cross-platform, works in such OSs, as: Windows, Linux, macOS, Solaris, FreeBSD, NetBSD and many others.

To do the source code analysis, we used PVS-Studio static code analyzer. To analyze the source code, first we needed to compile the project in an OS. The choice was wide not only due to the cross platform nature of the project, but also because of that of the analyzer. I chose macOS for the analysis. You can also run the analyzer under Windows and Linux.
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Checking FreeRDP with PVS-Studio

Reading time10 min
Views1.7K

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FreeRDP is an open-source implementation of the Remote Desktop Protocol (RDP), a proprietary protocol by Microsoft. The project supports multiple platforms, including Windows, Linux, macOS, and even iOS and Android. We chose it to be the first project analyzed with the static code analyzer PVS-Studio for a series of articles about the checks of RDP-clients.
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The Overview of JavaScript Frameworks: Which One to Choose for Your Project?

Reading time4 min
Views1.8K
Ten years ago, companies who wanted to create cross-platform projects would have to cooperate with different development teams and experts. However, 2009 has changed the game, because the developers from Nitobi (later purchased by Apache) presented Cordova – a fresh framework that was able to convert web applications into mobile systems. Linking the devices’ APIs via plugins, developers could access smartphones and tablets. Cordova is a JavaScript-based tech compatible with various platforms.

In this guide, we will review three more JS-driven systems, look at their unique features and compare them.
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I lost faith in the industry, burned out, but the cult of the tool saved me

Reading time6 min
Views35K


I often rail at technologies I find inadequate, and in response I receive (along with arguments) sheer anger and pain. Sometimes physical.

Developers take critique of their favorite technologies very personally for some reason. This “cult of the tool” is such a strange phenomenon I can’t explain it logically. Some say everyone’s prone to it, because a coder’s thinking processes intertwine very deeply with his programming language. Some say it’s a junior’s fallacy — you write something for the first time, it works, and you start treating your language like something divine.

Whatever it is, I never understood it.

I always considered cultists as imbeciles. But I always try to understand why imbeciles became them, why I’ve avoided that fate. I start thinking and bam! — it turned out I’m also an imbecile. I’m a cultist who worships F#. And, of course, there’s a story behind it.
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“I can tell you about the pain every iOS developer has in the ass” — 10 questions to a developer, episode 2

Reading time7 min
Views3.6K


Seems like everyone enjoyed the pilot episode, and we’re still sure that people “behind the scenes” can be as exciting as IT celebrities we all know and love. And maybe even more, because they talk about real problems and real solutions. This week we asked 10 questions to a person behind the development of Yandex.Maps for iOS.

Progress and hype in AI research

Reading time19 min
Views4.9K

The biggest issue with AI is not that it is stupid but a lack of definition for intelligence and hence a lack of formal measure for it [1a] [1b].


Turing test is not a good measure because gorilla Koko [2a] and bonobo Kanzi [2b] wouldn't pass though they could solve more problems than many disabled human beings.


It is quite possible that people in the future might wonder why people back in 2019 thought that an agent trained to play a fixed game in a simulated environment such as Go had any intelligence [3a] [3b] [3c] [3d] [3e] [3f] [3g] [3h].


Intelligence is more about applying/transferring old knowledge to new tasks (playing Quake Arena good enough without any training after mastering Doom) than compressing agent's experience into heuristics to predict a game score and determining agent's action in a given game state to maximize final score (playing Quake Arena good enough after million games after mastering Doom) [4].


Human intelligence is about ability to adapt to the physical/social world, and playing Go is a particular adaptation performed by human intelligence, and developing an algorithm to learn to play Go is a more performant one, and developing a mathematical theory of Go might be even more performant.

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How to milk cows with robots and make an industrial startup of it. The history of the R-SEPT development

Reading time10 min
Views2.6K


In 2017, the media heard a very interesting story about a startup that robotizes milking cows on industrial dairy farms. The company is called R-SEPT, and back then it received 10 million rubles of investment. But a year has passed, and there's still no news on what happened further. We contacted Aleksey Khakhunov (AlexeiHahunov), the founder of the startup, and discussed the development. It turns out that the whole year his team was getting the prototype of the robot into shape, and just a week ago they conducted their first field test on the farm.

Under the cut there's a story about a robotics student who grew up on his parents' farm, turned the University diploma into an industrial startup, as he collected the first manipulators with his friends, and then scaled up to the level of state programs for the robotization of agriculture. And the most important is how the iron hand of the robot and the machine vision are better than a living milkmaid.
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I am a useless idiot, so I want to quit my job: 10 questions to a software developer, a pilot episode

Reading time7 min
Views9.2K


Hi there, Habr!

Remember the story of Steve Jobs and Dennis Ritchie? Without any intention to rekindle the debates or moralize on the subject, let’s face the truth: thousands of stellar techies live in the shadow, while their own stories are hidden in a dusty cupboard.

We, the Habr editorial team, are keen to tackle this injustice. From now on, we will regularly interview people who keep a low profile in media and social networks. So if you have anything to tell about yourself, get ready.

To give you an idea of what this will look like, we will lead the way. Click below to see 10 general questions we will ask every guest. For our pilot episode, the first guest to answer the questions was fillpackart. (This month I’ve had several quite good interview sessions with him, see articles one, two, three). Please read them, and if you make up your mind on telling your own story in a similar way, just send me or baragol a message.
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Qrator Labs' Value Partnership Programs

Reading time3 min
Views1.1K

Why is it valuable to get into the Qrator Labs partnership program?

In Qrator Labs, we firmly believe that working together brings a better result. Which is the reason why, for years, we were trying to find meaningful partnerships with all kinds of companies. They either seek to provide their existing customers with the top-notch DDoS mitigation technology developed at Qrator Labs with many additional ecosystem solutions or want to succeed the other way around. By getting their product available for Qrator Labs' customers by integrating into the Qrator anycast filtering network.

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Fault Tolerance Web Architecture for Our Cloud Solutions

Reading time10 min
Views3.3K
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Hi Habr,

I'm Artyom Karamyshev, a system administration team leader at Mail.Ru Cloud Solutions (MCS). We launched many products in 2019. We've aimed to make API services easily scalable, fault-tolerant, and ready to accommodate rapid growth. Our platform is running on OpenStack, and in this article, I describe all the component fault tolerance issues that we've resolved.

The overall fault tolerance of the platform is consists of its components fault tolerance. So, I'm going to show you step by step tutorial about all levels where we've found the risks.
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Solutions to Bug-Finding Challenges Offered by the PVS-Studio Team at Conferences in 2018-2019

Reading time8 min
Views1.1K

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Hi! Though the 2019 conference season is not over yet, we'd like to talk about the bug-finding challenges we offered to visitors at our booth during the past conferences. Starting with the fall of 2019, we've been bringing a new set of challenges, so we can now reveal the solutions to the previous tasks of 2018 and the first half of 2019 – after all, many of them came from previously posted articles, and we had a link or QR code with information about the respective articles printed on our challenge leaflets.
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Celestia: Bugs' Adventures in Space

Reading time6 min
Views1.1K
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Celestia is a three-dimensional space simulator. Simulation of the space allows exploring our universe in three dimensions. Celestia is available on Windows, Linux and macOS. The project is very small and PVS-Studio detected few defects in it. Despite this fact, we'd like to pay attention to it, as it's a popular educational project and it will be rather useful to somehow improve it. By the way, this program is used in popular films, series and programs for showing space. This fact, in turns, raises requirements to the code quality.
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Analysis of the Apache Dubbo RPC Framework by the PVS-Studio Static Code Analyzer

Reading time9 min
Views1.5K

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Apache Dubbo is one of the most popular Java projects on GitHub. It's not surprising. It was created 8 years ago and is widely applied as a high-performance RPC environment. Of course, most of the bugs in its code have long been fixed and the quality of the code is maintained at a high level. However, there is no reason to opt out of checking such an interesting project using the PVS-Studio static code analyzer. Let's see how it turned out.
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What is going to happen on February 1, 2020?

Reading time4 min
Views8.3K
TL;DR: starting February 2020, DNS servers that don’t support DNS both over UDP and TCP may stop working.

Bangkok, in general, is a strange place to stay. Of course, it is warm there, rather cheap and some might find the cuisine interesting, along with the fact that about half of the world’s population does not need to apply for a visa in advance to get there. However, you still need to get acquainted with the smells, and the city streets are casting cyberpunk scenes more than anything else.

In particular, a photo to the left has been taken not far from the center of Thailand’ capital city, one street away from the Shangri-La hotel, where the 30th DNS-OARC organization meeting took place on May 12 and 13. It is a non-profit organization dedicated to security, stability, and overall development of the DNS — the Domain Name System.

Slides from the DNS-OARC 30 meeting are recommended for everyone interested in how the DNS works, though perhaps the most interesting is what is absent in those slides. Namely, a 45-minute round table with a discussion around the results of DNS Flag Day 2019, which occurred on February, 1, 2019.

And, the most impressive result of a round table is the decision to repeat DNS Flag Day once again.
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