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QUESTION
I'm writing some code to parse TLS packets and ran across a weird issue. I don't think the official IANA pages are up to date seeing as I've found group, ciphers, and an extension that appears in traffic but not on these pages:
- General parameters: https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml
- Extensions: https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml
The above pages lack:
- Extension 13172 (NPN)
- Groups: 1035, 10794, 16696,23130, 31354, 35466, 51914
- Ciphers: 102, 129, 52243, 52244, 57363, 65279, 65413
I have a feeling this discrepancy has to do with TLS 1.3, but I can't seem to find similar references for TLS 1.3 values (did IANA really overhaul all values in TLS 1.3?)
...ANSWER
Answered 2021-May-04 at 11:49(Extension) NPN was never standardized; ALPN was selected instead. Drafts should still be available.
(Groups) 10794=0x2a2a 23130=0x5a5a 31354=0x7a7a 35466=0x8a8a 51914=0xcaca are all 'GREASE' values and are in the registry pointing to RFC 8701. I don't know what 1035=0x40b and 16696=0x4138 could be.
(Ciphers) According to Java source and older OpenSSL source, 102=0x0066 was defined in the failed EXPORT1024 draft, although it (alone) isn't actually restricted to 1024/56 strength. https://github.com/tls-check/TLS-Check/blob/master/lib/Net/SSL/CipherSuites.pm agrees with this, and has 52243=0xCC13 and 52244=0xCC14 as CHACHA suites used by Chrome at some time in the past (before standardization) and 65279=0xFEFF as RSA_FIPS_WITH_3DES_EDE_CBC_SHA_alias; it doesn't have 57363=0xE013. https://tlsfingerprint.io/top/ciphers has CC13,CC14 as 'LEGACY' CHACHA, FEFF the same, and E013 as unknown, all occurring rarely in ClientHello (offer) and never in ServerHello (result). 65413=0xFF85 is in the private-use range and could be anything.
TLS1.3 has all new ciphersuites 0x13xx that are functionally incompatible with older ones as they no longer specify keyexchange and server authentication; this is explained in 8446. 1.3 uses the same groups as lower protocols after the modifications of 7919 and 8422 (and 8701). It also uses mostly the same hash+sigalg pairs, now called SignatureSchemes, but changes the ECDSA values to constrain the curve, and adds new values for RSA-PSS (which are nominally required to be backported to 1.2, although that will likely be done only in implementations that implement 1.3 also). 1.3 keeps the existing extensions though some are no longer used (e.g. renegotiation-info extended-master encrypt-then-mac and point-formats don't apply to 1.3 because of protocol changes, though they can still be in a 1.3 offer to allow the server to accept at 1.2 or lower) and adds several new ones.
PS: IANA didn't 'overhaul' anything. While it has primary control for some resources (like addresses), for standards-track specifications and standards-action or similar registries IANA only records and publishes decisions proposed by the relevant IETF Working Group and approved by IESG.
QUESTION
I have a scheduled workflow that stopped running all of the sudden. Its supposed to run once a week, the last time it ran the config looked like
...ANSWER
Answered 2021-Apr-10 at 18:45The problem was that I had two approval jobs with the same name hold
. Giving them different names fixed it.
QUESTION
I need help with updating a particular node of the XML file. I use the MSXML2.DOMDocument60. This code demonstrates the idea:
...ANSWER
Answered 2021-Jan-18 at 14:49Simple xml file:
QUESTION
I have a glassfish server version 5.1 on linux (ubuntu 18.04). I could start it without any issues, but after enabling the secure-admin via
asadmin --host localhost --port 4848 enable-secure-admin
the server seems to fail to start permanently. I cannot stop-domain
or restart-domain
, although start-domain
says that there is something running on port 4848. So I have to manually kill the process.
server.log:
...ANSWER
Answered 2020-Aug-02 at 10:23After searching the github issues for problems related to this I finally found a solution that worked for me:
just remove the sun folder in the glassfish/modules/endorsed/grizzly-npn-bootstrap.jar of the server. After that glassfish 5.1 with jdk 1.8.0_261 worked in secure admin mode
QUESTION
I'm currently working on making a creature breeding game calculator/roller, and I've got a strange problem that i cant seem to figure out.
I'm not quite sure how to explain it, but ultimately what's wrong is that the 'gene abbreviations' I'm pulling from the dad's genetic info is not coming up in the baby's array. The math im using should make it so that the gene passes at 99%, meaning it should definitely be in the array but it's not actually coming up? I tried a bunch of different methods that i looked up and from here as well but nothing seems to be sticking.
I'm checking this in console.log and the array shows up as empty, but if you expand it in the console you can see it has values inside it! i'm not sure what i'm doing wrong and it's stopping me from continuing on with the rest of the code that i have planned. since the gene abbreviations arent actually in the array, the array isn't pushing anything to the childrens' genetic info. (i may be wrong about that though since im not actually coder by any means, but i'll cross that next bridge when i get to it haha)
the roller itself is at [http://seabirdtestroller.neocities.com] so you can try it out and see how it works. You will need to input the exact text that i placeholder'd in the input fields, since right now those are the only gene abbreviations i'm testing with and they're only being read from the dad's side currently
here is the entirety of the genohell.js file for quick reference, but it pulls info from the rollermath.js file as well (from the roller site):
...ANSWER
Answered 2020-Sep-06 at 17:49When something looks empty until you click on it in the console, that normally means that when console.log
was run the array was empty, but when you opened it it was full. You are calling console.log
here:
QUESTION
I am writing an app in python that controls some LEDs based on GPIO state. On the hardware, I listen for the GPIOs to change state and publish to an MQTT server running on a raspberry pi to control the LEDs. One of the GPIOs should cause an LED to blink indefinitely until state changes again to turn it off, exactly how a car turn signal works.
So when the GPIO goes high I publish to a topic with the payload 'on'. I then set a global variable
blinker_status = True
and then basically say (pseudo code)
while (blinker_status) { blink }
When I publish to that same topic with the payload 'off', I set the value of the global variable
blinker_status = False
I'm expecting the LED to stop blinking, but it doesn't. I'm not sure if the issue is that MQTT is blocking?
Once I start the LED blinking, perhaps it's blocking the on_message()
call back and it cannot process additional messages? Should I isolate all of my subscriber clients into their own threads so that publishing to each topic is handled by its own on_message()
call back?
I have code I can provide if necessary but at this point I'm stuck on trying to understand why my logic is flawed.
Below is my code
...ANSWER
Answered 2020-Jun-09 at 18:36The on_message
callback is run on the MQTT client's network thread, if you block that thread you will not be able to send or receive any more messages.
You should NOT be doing any blocking or long running actions in this (or any of the client callbacks), you should be setting flags in a state machine and using those changes to control other threads.
QUESTION
I was doing my android project. Basically the user enters a text and the model predicts whether it is offensive or not. This was done by training a deep learning model LSTM on python. Then I deployed it to the cloud (Firebase). And downloaded it in my android phone and created an interpreter from the remote model if it's been downloaded. Now when I try to run the application, the model gets downloaded from the cloud but it gives an error. PFA screenshot of the error message. Let me know what am I am doing wrong and why such an error occurred?
This is the log I get when I run the application,
...ANSWER
Answered 2020-Jun-08 at 18:07It seems to be a tensorflow-lite library internal problem. Your code seems to work fine as the following statement is recorded in the log: "succed to build FirebaseModelInterpreter", which means that onSuccessListener has worked fine. The problem occurs afterwards when tensorflow lite runtime is being initialized and the error is a libc error, which seems to have originated at the OS level, apparently due to some illegal memory access. In my assessment, this can only be due to tensorflow-lite library itself. You may try with a different version of the library or a different device, but I can't say anything for sure.
In gradle file:
Try changing
implementation 'org.tensorflow:tensorflow-lite:2.0.0'
to
implementation 'org.tensorflow:tensorflow-lite:+'
QUESTION
I have 2 photo electric sensors with NPN output: Looking at the data sheet it might actually be LOW (page 14 NPN Output): mouser.com/datasheet/2/307/e3fb_photoelectric-1189416.pdf page 14. The 2 sensors are placed 152.4 mm apart. Basically I want to start a timer when the first gate is triggered and finish when the second gate is triggered and then divide the set distance (152.4 mm) by the time to travel between each gate and output the speed in meters second. The sensors are powered by a 24 VDC power supply, the NPN output voltage can be as high as 3V DC from the collector. I first tested out the sensor to trigger the onboard LED to blink when an object is present in front of the sensor and was able to trigger the LED:
...
ANSWER
Answered 2020-May-08 at 07:30The logic of code doesn't seem right. From your explanation if you sure that trigged state is HIGH my code will be like this.
QUESTION
I have a problem when trying to generate a release version of my app. It gives a strange error
...ANSWER
Answered 2020-Apr-22 at 20:58Answering my own question because it turned out to be an R8
bug and after me reporting it, they solved the issue. Which is great.
Full bug report and how to apply fix is here
Short version:
change gradle
configuration to this
QUESTION
I'm currently testing an API on a website with a certificate by executing a php script that uses curl, in command line on my local windows machine. But the script never manages to reach the server. I have looked up solutions for this apparently frequent error, and tried the following, without success:
- Made sure the certificate is still valid.
- Made sure that the openssl php extension is enabled in php.ini, and that the .dll is indeed there.
- Downloaded the latest certificate bundle from https://curl.haxx.se/docs/caextract.html, as explained in the answer to this question and added it to php.ini. I have also checked that the certification authority for the website I'm trying to contact is indeed in that bundle (in my case, Comodo).
- Downloaded an older certificate bundle that's closer to the beginning of the website's certificate validity period.
- Downloaded the certificate directly from the certification authority via this link, and added the .crt to my php.ini file.
- Converted the .crt file retrieved above to .pem using this tool, then adding it to php.ini (replacing the one above).
Here is the script I'm using for testing (I'm executing it using php in command line only):
...ANSWER
Answered 2019-Mar-14 at 17:48Are you able to connect to the server from the command line with curl?
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