JSch | JSch mirror of https : | Cryptography library
kandi X-RAY | JSch Summary
kandi X-RAY | JSch Summary
JSch is a pure Java implementation of SSH2. JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs. JSch is licensed under BSD style license.
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Top functions reviewed by kandi - BETA
- Entry point for the session
- Get an input stream
- Write data to destination file
- List files at the given path
- Parse the key
- Returns an array of bytes
- Reads bits from the buffer and returns them as a byte array
- Main loop
- Send keepalive message
- Connects to the jboss server
- Parses the certificate
- Main method for testing
- Get next message
- Connects to the remote host
- Main entry point for Scp2
- Scans the command line
- Starts the ssh server
- Decrypt the data
- Start the server
- Writes a packet
- Parses the wire format
- Start SSH_USER_REQUEST message
- Initializes the SSH_USER_INFO packet
- Initializes the client
- Start the proxy server
- Sets proxy command
JSch Key Features
JSch Examples and Code Snippets
Community Discussions
Trending Discussions on JSch
QUESTION
we are currently working with a cloud product that uses JSCH internally to connect to external sftp sources. Im investigating an connection reset exception that we are getting when trying to connect to azure sftp.
Using wireshark i determined that the problem occurs after we send the Client: Key Exchange Init. Establishing the same connection with filezilla we dont have this issue.
comparing the packages from jsch and filezilla i didn't see an obivious issue, but im not an expert on the ssh protocol. im gonna post both requests below if somebody could give me any pointers it would be greatly appreciated.
Request with JSCH (not working)
Request with Filezilla (working)
Response with Filezilla (working)
See below for the log output:
...ANSWER
Answered 2022-Feb-03 at 08:09i wanted to post a quick update for anybody that is having the same issue, i opened a similiar question on the microsoft q&a site and looks like it's an issue on the azure side that they are working on fixing for GA Microsoft Q&A
QUESTION
I'm trying to compare file by JSch – diff command.
I want to get the status by Java code to know if the file equals or not i.e. echo $status.
How can I do that in java?
This is my class to run SSH commands
...ANSWER
Answered 2021-Dec-28 at 19:19Do not execute commands in "shell" channel in the first place. The "shell" is a black box with an input and output only. See What is the difference between the 'shell' channel and the 'exec' channel in JSch
Use the "exec" channel. In the "exec" channel, the Channel.getExitStatus works.
For a code example, see: How to read JSch command output?
Obligatory warning: Do not use StrictHostKeyChecking=no to blindly accept all host keys. That is a security flaw. You lose a protection against MITM attacks. For the correct (and secure) approach, see: How to resolve Java UnknownHostKey, while using JSch SFTP library?
QUESTION
So I try to start a Java program on a raspberryPi via jsch from my visual studio code on my pc. The program connects to a mariadb database and does a simple Select statement.
If I'm logged in on the raspberryPi, via putty, the connection between the java program and mariadb works fine. If I try to execute the program via another java program with jsch, the program will start but won't execute the line connection = verbindung_datenbank.getConnection(dbURL, user, password);
I placed some System.out.println(); lines to find the line where the program stops working. Befor the line it worked, after that it didn't.
What I don't understand is, why does the program work if I'm logged in over putty but won't work if a program is loged in via SSH?
Here the full code:
...ANSWER
Answered 2021-Dec-29 at 13:54So the tip from Martin Prikryl was right. Jsch uses different bash files and so my program didn't work. My solution: I programmed a small bash script:
QUESTION
I am building an api with Java Spring Boot and what I want to do is use an endpoint to download a file. The problem is that the api accesses the file through ssh. I don't want the api to download the file and then return it, what I want is to make a direct stream from ssh to the response. Is this possible?
To connect by ssh and get the file I am using JSch. The files I want to download can be up to 2 GB in size. Thank you
Edit: I finally did this and it worked. Many thanks to @Martin Prikryl for his help.
...ANSWER
Answered 2021-Sep-14 at 05:34JSch has these two ChannelSftp.get overloads that will help you:
Based on your other question (How to return an InputStream as a file in Spring Boot?), in Spring Boot, you use HttpServletResponse API to stream the response (file). Combined with the ChannelSftp.get that accepts OutputStream, the code can be:
QUESTION
I'm trying to rename files in a remote sftp server at the end of a transaction and using Spring Boot Integration. In the official documentation they provide examples using TransactionSynchronizationFactory with SpEL expressions similar to:
...ANSWER
Answered 2021-Nov-20 at 13:15Your problem is here: com.jcraft.jsch.ChannelSftp$2. Pay attention to that $2. This is already not a ChannelSftp, but an internal InputStream for the remote file. And that's exactly what SftpStreamingMessageSource is producing. It does not return files, neither ChannelSftp. You cannot call rename() on the InputStream.
Consider to use a special IntegrationMessageHeaderAccessor.CLOSEABLE_RESOURCE header instead. This one is an instance of the org.springframework.integration.file.remote.session.Session which already has a required rename(String pathFrom, String pathTo) method. But again: this one is going to do that for the remote file:
QUESTION
We have a Jenkins setup on Google Kubernetes Engine with dynamic kubernetes pods serving as build agents. I want to integrate Pylint as a build step. Python version running on kubernetes pod is 2.7.16. Any idea how to install Pylint and integrate it into Jenkins build?
Edit:
Jenkins is running on a Google Kubernetes Engine cluster.
Kubernetes Cloud is configured in Jenkins as given below:
List of plugins installed are as follows:
...ANSWER
Answered 2021-Nov-01 at 23:32I think you probably can achieve the desired behavior by adding a convenient container to your pod template: this container will include the necessary Pylint dependencies and will be used in addition to the default Jenkins agent image in your pod.
As you can see in your screenshot, you can add this container when configuring your pod template and Kubernetes in the Jenkins Web console.
In addition, you can provide the necessary information when defining your pipeline. Consider for instance the example provided in the Jenkins Kubernetes plugin documentation:
QUESTION
How do I create a zip file from an existing Java project that can be uploaded to an AWS Lambda function??
I can't find any clear steps on how to do this. I want to export my Eclipse project as a zip file and then upload it to AWS Lambda. Currently, I use the AWS Toolkit in Eclipse to upload the project, but now I want to do it manually using a zip file.
What are the steps?
This is how I tried to do it. This is where I export the project as a zip:
Then, I go to AWS and choose to upload a zip file:
I choose my zip file and then test the code and this is the error I get:
...ANSWER
Answered 2021-Oct-21 at 20:21You can create a Maven project in Eclipse and then Export that as a JAR file that you can upload to the AWS Management Console. Its very easy to do so. To learn how to do this use case, see this AWS tutorial. It uses IntelliJ (just switch that for Eclipse), and follow the rest of the doc.
The example use case for this Lambda function is to detect personal protective equipment (PPE) in images located in an Amazon Simple Storage Service (Amazon S3) bucket. It steps you through all steps including deploying the Lambda function.
Creating an AWS Lambda function that detects images with Personal Protective Equipment
You will never encounter issues that you are seeing in this tool when building and deploying via the Console.
Update This Lambda function works -- just tested it. Here are the results in the Lambda Console.
Data that is placed in the DynamoDB table:
Your error is saying it cannot find the cred provider. When using Lambda, you do not need to set creds in your Java code. The permissions are set in the IAM role. You need to set the policy for the IAM role so it can invoke the services. SO in this example use case, we set policies for lambda-support.
Another Update
From Eclipse, I build a project using your code (I think this PPE is pretty advanced - so we will make a new one named Getting Started with Lambda). It worked well:
QUESTION
So I'm using gitlab and I have a java project that's built on gitlab VM using a .gitlab-ci-yml file.
I have this problem where we have to change the java version the project is build with (current java 11).
So adding in build.xml this: will print 11.
I've tried to change it specifying in javac the source and target but if the target is not specified, it will not build it using another java version, and if it is specified, it will return an error:
Also using will return the same error.
So I'm not sure if basically adding my own ant tool and java version into the package and force it to use that one will work, I don't know how to do this.
Here is the build.xml file and also the .gitlab-ci.yml
UPDATE: .gitlab-ci.yml was updated. Now the error seems to be the following, having the below .gilab-ci.yml file:
Unable to locate package adoptopenjdk-17-hotspot
build.xml
ANSWER
Answered 2021-Oct-18 at 13:08According to the information provided in the comments, you have Java 14.0.1 on your GitLab runner. Since this Java version is used to launch ant and its tasks, it cannot compile code with a "17" target version.
To make a long story short, you'll need a newer Java version on your runner.
The simplest way of doing this is probably by using a pre-built image that contains it:
QUESTION
I have a Reactor Kafka application that consumes messages from a topic indefinitely. I need to expose a health check REST endpoint that can indicate the health of this process - Essentially interested in knowing if the Kafka receiver flux sequence has terminated so that some action can be taken to start it. Is there a way to know the current status of a flux (completed/terminated etc)? The application is Spring Webflux + Reactor Kafka.
Edit 1 - doOnTerminate/doFinally do not execute
...ANSWER
Answered 2021-Oct-12 at 07:57You can't query the flux itself, but you can tell it to do something if it ever stops.
In the service that contains your Kafka listener, I'd recommend adding a terminated (or similar) boolean flag that's false by default. You can then ensure that the last operator in your flux is:
QUESTION
Environment:
Linux + JDK 11 + Gradle 5.0
I have several gradle projects which must build from sources without Internet connection/ For example this one git clone --depth 1 --branch 3.0.0 https://github.com/bobbylight/RSyntaxTextArea.git for that first of all I built this project online then copy ~/.gradle to $PROJECT_DIR/grdl , next I want to test this build offine. I perform gradle --stop , clear whole ~/.gradle directory then turn off Internet and run following script:
ANSWER
Answered 2021-Sep-13 at 14:01I think you are hitting this issue: https://github.com/gradle/gradle/issues/1338
That is, cache items are non relocatable. Copying the whole ~/.gradle folder may not be enough, especially if ~ resolves to a different path than in the original machine (i.e. different user). The full path needs to be exactly the same (with Gradle 5.0).
The issue suggests however that version 6.1 makes the cache relocatable, so perhaps you'll have more luck with a recent version (7.2 is the latest at this point in time).
EDIT: The release notes and these docs confirm that the cache can be copied across deployments as of version 6.1.1.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install JSch
You can use JSch like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the JSch component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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