verity | assertions on http requests | Assertion library
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QUESTION
I have programmed a simple clone of Slither.io in python using pygame and sockets and I have three problems:
- When I play the game alone on my laptop the game is choppy. Every ten seconds my game get stuck for a while (one milisecond) and then continue. It's not a big problem but it's annoying.
- When I play on two computers in my local network, I see the other player (the other snake) is also choppy.
- The strangest problem is when I run my server on my main laptop and then run the game on my second laptop the game starts and after few seconds crash. Debugger on client says that pickle data was truncated while receiving data from the server. But when I run the server program on my second laptop and the game on my main laptop everything is OK. Why?
I tried:
Problem 1. change FPS on the client and time.sleep on the server
Problem 2. change time.sleep on the server
Problem 3. change the input value of recv() method
Server code:
...ANSWER
Answered 2021-Mar-15 at 17:49Your third problem (truncated pickle data) is because you are using TCP, and you are unpickling whatever recv
returns. You might be thinking that whenever you send
something, and the receiver calls recv
, returns the exact same thing, but actually it doesn't. TCP splits your data up into packets, so the receiver might not receive all the data at the same time.
For example, if you send "abcdefgh" and then separately send "ijkl", it's allowed for the first receive to return "abcd" and the second to return "efghijkl". Or the first one could return "ab" and the second one could return "cde" and the third one could return "fghijkl", or so on.
You have to design a way for the receiver to know when to stop receiving. For example, if you sent "8abcdefgh" and then "4ijkl", the receiver could get "8abcdefgh4ij", and then it knows "8abcdefgh" is one "send" (because it starts with 8 and then 8 more bytes) and it knows the "4ij" is the beginning of the next "send" but it's not the whole thing (because it starts with 4 but there aren't 4 more bytes).
Another way is to send a special character like a newline (enter key) after each message. This probably doesn't work with pickles because pickles can have newlines in them. But you could choose another byte that pickles don't have, like 0xFF. Then the receiver knows to keep on receiving until it sees the byte 0xFF.
QUESTION
I have a project that sits in a monorepo. That monorepo is been shared among a lot of projects with different types. I have a React project with NPM in this monorepo.
We are using VSCode for the development of this repo, since there are verity of people (experts and less experts) that touch the code, I want to make the process as easy as possible to prevent issues for everyone. For example, run npm install
if the package.json
file has changed.
Since it is a monorepo, no one is allowed to create git hook for a specific sub project. So I search for a solution of "local git hooks" that will not impact other projects.
Since we are using VSCode and open the root project directory in it, is there any way to create "local" git hooks in VSCode? For example, if someone run git pull
in the VSCode the VSCode will execute additional command after like a hook?
ANSWER
Answered 2021-Mar-14 at 16:48We've been in a similar situation and ended up using Husky in conjunction with Yarn Workspaces
It's been working great for us - the only thing that every developer needs to know is to run yarn
after cloning, and all tools will be installed.
The only caveat in your situation is that you will need to write your own hook for e.g. running npm install
if the pulled commits contain package.json
changes, but that shouldn't be very hard to do - husky
hooks are plain bash
scripts after all.
QUESTION
I have a pandas dataframe and I am trying to find out the sum of two columns and put it into another column called 'Total', but when I verity the number, its 2x times the actual sum. I wonder why.
Code snippet:
...ANSWER
Answered 2020-Nov-24 at 09:27With pandas you can add two columns in a more simple way:
QUESTION
device verity state is: ENABLED
I got above line in boot log. May I know, what it will do exactly? I have read in android source link, but did not understand.
Can you please help me.
Thanks in advance.
...ANSWER
Answered 2020-Apr-18 at 01:39Android can use dm-verity
to protect non-data partitions against manipulation (link, link).
The goal is to prevent an attacker (with physical access to the device) from inserting malicious code, e.g. into low-level Android services stored on the /system
or /recovery
partition.
For partitions marked with the verity
flag in the fstab
, at build-time the dm-verity hash tree of the partition is computed. The hash tree is signed with an RSA key and appended as meta-data to the partition. The public part of the RSA key is added to the boot
partition.
At boot-time, the kernel verifies the integrity of the signed hash tree in the partition meta-data using the RSA public key stored in the boot
partition. Then it can compute the hash tree of the partition and compare it to the hash tree from the meta-data. If there is a mismatch, the kernel refuses to boot.
Therefore, if an attacker manipulates the partition, the hash tree computed at boot-time will not match the hash tree from the partition meta-data. If the attacker also manipulates the hash tree from the partition meta-data, the signature validation with the RSA public key will fail.
Of course you then need an additional mechanism to ensure the integrity of the boot
partition. This can be done with Secure-Boot-like mechanisms where the boot
partition is again signed with another (RSA) key and the public part of that key is embedded at a lower level (vendor-specific). Such a chaining of verification mechanisms is referred to as a chain of trust. Ideally, you would want a chain of trust to extend down to the hardware level, with some vendor key being burned into the chip.
QUESTION
This is what I tried:
...ANSWER
Answered 2020-Feb-21 at 16:52You can check the path by going to Tools -> SDK Manager and looking at Android SDK Location. Generally, the adb is present under the platform-tools folder present under this Android SDK Location.
At that location you need to execute ./adb
.
Else you can also export that platform-tools path to access adb from anywhere, as follow:
QUESTION
I'm trying to build a simple deployment helper for our deployment process and I'm trying to do an update on a SQL database in azure from a small .NET console application.
The method thats throwing the issue is right below
...ANSWER
Answered 2020-Feb-13 at 22:00That error means some column you are using isn't found, SQL syntax error. pseudo code below, something like that... (you are missing apostrophes around email value)
Use the @
sign to make it a parameter. After that add parameter to query. You are missing some characters, so it thinks your email is an actual column. Just update your query.
QUESTION
Ok, coming from here: Read only 4 first letters of .txt file - Python3 This is my second question (sorry for the noob questions..). I succeed reading the platform in 4 letters, now what I want is that if platform = mt81 or mt67 continue and if not exit. For that I used:
...ANSWER
Answered 2019-Sep-08 at 13:19I guess you want to pass the code not continue, so try to change continue to pass. continue
starts the next loop at the beginning and pass
just pass to the next code.
QUESTION
System applications gain their permissions without user interaction because they have been signed with the same key as the platform.
...ANSWER
Answered 2019-Jun-04 at 12:52The solution lies in modifying the signature verification method inside the services.jar
The services.jar have a PackageManagerService.smali with a CompareSignature method.
QUESTION
I am seeing all types of strange errors when running a dataflow job (Beam 2.12).
The job basically takes input from pubsub, read/writes from/to Datastore writes the result to pubsub.
Several Warnings W
and Errors E
appear in the Stackdriver logs. It is unclear how to resolve these. Up to now we were using Beam 2.9 and were not experiencing any of these issues.
A partial (redacted) log dump is available below.
...ANSWER
Answered 2019-Apr-30 at 06:52I resolved this by upgrading several dependencies.
The maven versions plugin helped me do this, I installed the plugin by adding the following to my .pom
file:
QUESTION
I found some similar issues on StackOverflow like Can't mount system android : read file only [duplicate],How can I remount my Android/system as read-write in a bash script using adb? and I tried those anwsers but all doesn't work for me,so please don't add duplicated tag for this issue. I do remount /system on AVD (Android 8.1 x86),what I'm trying as follow:
...ANSWER
Answered 2018-Sep-01 at 00:21I fixed the exact same problem you were having with the following steps:
- Open the shell with
.\adb.exe shell
- Open the mounts file with the command
cat /proc/mounts
inside the shell - On the /system line, take a look on your mount type (in my case ext4) and the path (/dev/block....)
- Exit the shell and then run
.\adb.exe root
followed by the command.\adb.exe shell 'mount -o rw,remount -t /system'
- If the problem still persists, run
.\adb.exe reboot
and try step 4 again
I hope this fixes your problem!
EDIT: You need to start up the emulator with Writable System image on powershell. Go to the emulator folder on your android-sdk directory and then run
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