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# Overview
## Before You Start
You should be at least moderately comfortable with Git, CMake, and the command
line before relying on this method. It requires a good bit of free hard drive
space due to the large amount of dependencies required for the build (see below)
and is meant for programmers that want to help discover and fix programming
errors. When in doubt go for [binaries](Home) instead!
# How to Build Barrier.app on MacOS
*as of May 2020*
- Install Xcode from the App Store or download and install it
from the [Apple Developer Website](https://developer.apple.com/download/more/?=xcode)
- Install either [MacPorts](https://www.macports.org/) or [Homebrew](https://brew.sh/)
following the instructions on their websites
- Install dependencies with either MacPorts or Homebrew (see below)
- Build either the `Debug` or the `Release` targets (see below)
### Install dependencies with MacPorts
- Install packages for Qt5, OpenSSL, and PkgConfig
```
sudo port install qt5 openssl pkgconfig
```
### Install dependencies with Homebrew
- Install packages for Qt5, OpenSSL, and pkgconfig
```
brew install qt5 openssl pkg-config
```
### Clone the repository
```
git clone https://github.com/debauchee/barrier
```
- Change directories into the cloned repository
```
cd barrier
```
### Build the Debug target
*The debug target produces un-stripped binaries that have symbols that can be
used for debugging.*
- Build the `Debug` target using the `clean_build.sh` script
```
./clean_build.sh
```
By default the resulting binaries will be in `./build/bin` and the
application bundle (.app) will be in `./build/bundle`. The debug target
does not create a disk image (dmg).
### Build the Release target
*The release target produces smaller stripped binaries and distributable disk image.
This is probably what you want if you are a user.*
- Build the `Release` target using the `clean_build.sh` script with environment variables
*This step assumes the use of a bourne-like shell (i.e. bash). If using another shell like*
`csh` *change the export command to use* `setenv` *instead*.
```
export B_BUILD_TYPE=Release
./clean_build.sh
```
By default the resulting binaries will be in `./build/bin` and the
application bundle (.app) will be in `./build/bundle`. The release target
also creates a disk image (dmg).
#### Notes
A [`build_env.sh`](https://github.com/debauchee/barrier/blob/b6a1b5742006157c3fe746288961a9d2827a3f26/clean_build.sh#L20)
file can be created for persistent build environment variables [without being tracked by git](https://github.com/debauchee/barrier/blob/b6a1b5742006157c3fe746288961a9d2827a3f26/.gitignore#L1)

0
Buidling-the-flatpak.md → Building-the-Flatpak.md

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## General ## General
There is quite a bit to be added to our wiki here on GitHub. As time permits and as the project progresses we will be adding bits of information to the wiki. For now we wanted to share our binary downloads for stable builds. Stay tuned for more! There is quite a bit to be added to our wiki here on GitHub. As time permits and
### Distro-Specific Pacakges as the project progresses we will be adding bits of information to the wiki. For
now we wanted to share our binary downloads for stable builds. Stay tuned for
more!
*Current Version:*: 2.3.2
[![Packaging status](https://repology.org/badge/vertical-allrepos/barrier.svg)](https://repology.org/project/barrier/versions) [![Packaging status](https://repology.org/badge/vertical-allrepos/barrier.svg)](https://repology.org/project/barrier/versions)
## Binary Downloads ## Binary Downloads
[Binary downloads can be found here](https://github.com/debauchee/barrier/releases/tag/v2.3.1) [Windows](https://github.com/debauchee/barrier/releases/download/v2.3.2/BarrierSetup-2.3.2.exe)
* The installer will automatically download and install the VC++ Runtime if
necessary.
[macOS](https://github.com/debauchee/barrier/releases/download/v2.3.2/Barrier-2.3.2-Release.dmg)
FreeBSD - no builds available as of yet.
Linux - no builds available as of yet, RPM, DEB packages on the roadmap.
### Distro-Specific Linux Packages
[ArchLinux AUR](https://aur.archlinux.org/packages/barrier/) (maintainer: [Tblue](https://github.com/Tblue))

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<a name="top"></a>
# Barrier Troubleshooting Steps
This guide has steps that can be tried for troubleshooting Barrier. These steps can help isolate the issue and recommend things to try to resolve the issue. Specific steps for making configuration changes outside of Barrier (i.e. Network, Firewall, Permissions, etc...) are outside the scope of this document and the appropriate references should be used.
## Document Conventions
- Text in angle brackets `<text>` is input supplied by the user
- Text in _italics_ are user interface elements, items on-screen, or filenames
- Text in a `monospaced font` are keyboard shortcuts, prompts, commands, or command output
## Things to Check
- [The Command Line](#command_line)
- [Processes Running](#processes_running)
- [Server Reachability](#server_reachability)
- [Server Listening](#server_listening)
- [Multiple Instances](#multiple_instances)
- [Fingerprint Trust](#fingerprint_trust)
## <a name="command_line">Command Line</a>
Most of the tools used to troubleshoot in this guide are run from a text-based command line. These are some possible steps to get to the command line interface.
__Note:__ None of the below commands should require elevated access (`Administrator cmd.exe`, `sudo`, `su`, `doas`, or equivalent) unless specified.
### Windows Command Prompt
1. Press the `(⊞ Win) + R` to open the _Run_ dialog
2. In the _Open:_ textbox, type `cmd` and click _OK_
### Windows PowerShell
1. Press the `(⊞ Win) + R` to open the _Run_ dialog
2. In the _Open:_ textbox, type `powershell` and click _OK_
### MacOS Terminal.app
1. Press `(⌘ Cmd) + Space` to open _Spotlight_ search
2. Type `Terminal.app` and press `Enter`
### Linux Virtual Terminal
There are many ways to open a terminal emulator in the GUI on various linux distributions. If you do not know how to access a terminal emulator (`xterm`, `konsole`, `gnome-terminal`, etc...) the steps for accessing the console are fairly standard. Press `Ctrl + Alt` and one of the Function keys (usually `F1` through `F7`) to switch between back and forth between the GUI and virtual terminals.
[Back to Top](#top)
## <a name="processes_running">Processes Running</a>
Barrier uses multiple process to create the software KVM effect. If using the GUI, check that GUI icon is in the _system tray_ (Windows or some Linux desktops) or on the right side of the _menu bar_ (MacOS). The GUI is only used to configure and control the client or server processes.
### Windows Processes
- Press `Ctrl + Shift + Esc` to open the _Task Manager_
- Click on the _Details_ tab and click on the _Name_ header to sort by name
- Look for the `barrier.exe` process if the GUI is running
- Look for the `barrierd.exe` process
- Look for the `barrierc.exe` process on a client
- Look for the `barriers.exe` process on a server
### Linux/Unix/MacOS
- Use [ps](https://en.wikipedia.org/wiki/Ps_(Unix)) and [grep](https://en.wikipedia.org/wiki/Grep) commands to find barrier processes:
```shell
ps -ax -o user,pid,command | grep -i [b]arrier
```
- Look for the `barrier` process if the GUI is running
- Look for the `barrierc` process on a client
- Look for the `barriers` process on a server
__Note:__ Including the brackets [] in the `grep` syntax prevents it from matching instances of `grep` in the process list.
[Back to Top](#top)
## <a name="server_reachability">Server Reachability (Ping)</a>
Barrier needs network connectivity between machines to work. The easiest way to test this is with the [ping](https://en.wikipedia.org/wiki/Ping_(networking_utility)) or [Test-Connection](https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/test-connection) commands.
### Windows Command Prompt
```cmd
ping <hostname or IP>
```
### Windows PowerShell
```powershell
Test-Connection -ComputerName <hostname or IP>
```
### Linux/Unix/MacOS Command Line
```shell
ping -c 4 <hostname or IP>
```
__If successful you should see four replies with the IP address and the time (in milliseconds)__
__Steps to try if unsuccessful:__
- Make sure that both devices are either on the same Local Area Network (LAN) or check that the LANs they are on are connected and routing
- Make sure that ping (ICMP) is being allowed through any software firewalls or hardware firewalls between the devices. (This can be turned back off after troubleshooting is resolved)
- If using a hostname, make sure you are able to resolve that hostname to an IP address (Local DNS Server, mDNS, Avahi, NETBIOS, `/etc/hosts`, or equivalent method). Alternatively, consider using IP addresses instead
[Back to Top](#top)
## <a name="server_listening">Server Listening (Port 24800)</a>
The server listens for a network connection on port 24800. You can test connectivity to this port from both the server and its clients. Check connectivity from the server to itself first to make sure it is accepting connections, then check that you can connect to the server across the network from the client.
- Make sure the server has been started in the Barrier GUI or that the required [processes are running](#processes_running) first
### Windows PowerShell Test-NetConnection
- In the PowerShell window run:
```powershell
Import-Module NetTCPIP
Test-NetConnection -ComputerName <hostname or IP> -Port 24800
```
- If you see `TcpTestSucceeded : True` you are able to connect to the server
__Note:__ If you know of an __easy__ way to test SSL connectivity with Windows please feel free to contribute it here. This method only tests connectivity to the port.
### Windows OpenSSL Client Connect
The `openssl` command used below for Linux/Unix/MacOS to test connectivity __and__ SSL encryption can be obtained for Windows from various third parties distributions. Check the [OpenSSL Wiki](https://wiki.openssl.org/index.php/Binaries) for more information.
### Linux/Unix/MacOS OpenSSL Client Connect
- Use the [openssl](https://wiki.openssl.org/index.php/Command_Line_Utilities) command in the terminal to connect to the server by hostname:
```shell
$ openssl s_client -connect <hostname or ip>:24800 | head
```
- If you see `CONNECTED` you are able to connect to the server
- If you see `Server Certificate` the SSL encryption is working
- You may see `verify error:num=18:self signed certificate`. Barrier generates a self-signed certificate, so this is nothing to be concerned about
__Steps to try if unsuccessful:__
- Make sure the Barrier server [process is runnning](#processes_running)
- Make sure that port `24800` inbound is being allowed through any software firewalls or hardware firewalls between the devices
- Make sure that port `24800` outbound is being allowed through any software firewalls on the client
- Instructions for adding Barrier to the Windows firewall can be found [here](Adding-Barrier-to-the-Windows-Firewall.md)
[Back to Top](#top)
## <a name="multiple_instances">Multiple Instances</a>
Multiple instances of the background services that Barrier uses (`barriers` on the server, and `barrierc` on the client) can cause issues. For example, if another `barriers` process is running in the backround it will prevent the current process from binding to port `24800` and you may see incorrect status in the GUI.
### Windows
- Press `Ctrl + Shift + Esc` to open the _Task Manager_
- Click on the _Details_ tab and click on the _Name_ header to sort by name
- Make sure there is only one `barrier.exe` process if the GUI is running
- Make sure there is only one `barriers.exe` and one `barrierd.exe` process if the server is running
- Make sure there is only one `barrierc.exe` and one `barrierd.exe` process if the client is running
### Linux/Unix/MacOS
- Use `grep` and `ps` to find barrier processes
```shell
ps -ax -o user,pid,command | grep -i [b]arrier
```
- Make sure there is only one `barrier` process if the GUI is running
- Make sure there is only one `barriers` process if the server is running
- Make sure there is only one `barrierc` process if the client is running
__Note:__ The barrier command line arguments may make a single command wrap on the terminal to more than one line
__Steps to try if unsuccessful:__
- Try stopping all of the barrier processes (_End Task_ on Windows, `kill <pid>` on Linux/Unix/MacOS) and relaunching the program
- Try restarting the computer
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## <a name="fingerprint_trust">Fingerprint Trust</a>
Barrier uses fingerprints to validate that a malicious server is not trying to intercept a client connection. These fingerprints may be automatically generated if _Auto Config_ is selected in the client. If your client does not trust the fingerprint it will refuse the connection.
The _TrustedServers.txt_ file should contain the fingerprint found in the _Local.txt_ file on the server.
### View the server fingerprint in the GUI
- Open the main Barrier GUI window
- The _SSL Fingerprint:_ field in the _Server_ section shows the current server fingerprint
### View the fingerprints on Windows
- Open _File Explorer_
- In the _path bar_ enter `%LocalAppData%\Barrier\SSL\Fingerprints`
- Double-click either _Local.txt_ for the server fingerprints, or _TrustedServers.txt_ to view the fingerprints trusted by the client
### View the fingerprints on MacOS
- To view the trusted fingerprints on the client use the [more](https://en.wikipedia.org/wiki/More_(command)) command to view the _TrustedServers.txt_ file:
```shell
more ~/Library/Application\ Support/barrier/SSL/Fingerprints/TrustedServers.txt
```
- To view the server fingerprint on the server use the `more` command again:
```
more ~/Library/Application\ Support/barrier/SSL/Fingerprints/Local.txt
```
### View the trusted fingerprints on Linux or Unix
- To view the trusted fingerprints on the client use the [more](https://en.wikipedia.org/wiki/More_(command)) command to view the _TrustedServers.txt_ file:
```shell
more ~/.local/share/barrier/SSL/Fingerprints/TrustedServers.txt
```
- To view the server fingerprint on the server use the `more` command again:
```shell
more ~/.local/share/barrier/SSL/Fingerprints/Local.txt
```
On Linux or Unix systems the barrier _TrustedServers.txt_ or _Local.txt_ files may not always be in the same place depending on your system configuration. If they are elsewhere, use the [find](https://en.wikipedia.org/wiki/Find_(Unix)) command to locate them.
```
find / -type f -name '*TrustedServers.txt' 2>/dev/null
find / -type f -name '*Local.txt' 2>/dev/null
```
__Note 1:__ These `find` commands may find other files with the same names. Check that the path includes `barrier`
__Note 2:__ The `2>/dev/null` is to hide _Permission denied_ errors you would otherwise get from searching directories you do not have permission for as a normal user
__Steps to try if unsuccessful:__
- Try to copy & paste the contents of _Local.txt_ on the server into the _TrustedServers.txt_ file manually
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