Janus is an open source, general purpose, WebRTC gateway designed and developed by Meetecho. This version of the gateway can only be installed on Linux systems: next versions will take into account cross compilation on different environments.
For some online demos and documentations, make sure you pay the project website a visit!
To discuss Janus with us and other users, there's a Google Group called meetecho-janus that you can use. If you encounter issues, though, please submit an issue on github instead.
##Dependencies To install it, you'll need to satisfy the following dependencies:
- Jansson
- libnice
- OpenSSL (at least v1.0.1e)
- libsrtp (at least v1.5 suggested)
- Sofia-SIP
- usrsctp (only needed if you are interested in Data Channels)
- libmicrohttpd (only needed if you are interested in REST support for the Janus API)
- libwebsockets (only needed if you are interested in WebSockets support for the Janus API)
- cmake (only needed if you are interested in WebSockets support, as libwebsockets makes use of it)
- rabbitmq-c (only needed if you are interested in RabbitMQ support for the Janus API)
A couple of plugins depend on a few more libraries:
Additionally, you'll need the following libraries and tools:
All of those libraries are usually available on most of the most common distributions. Installing these libraries on a recent Fedora, for instance, is very simple:
yum install libmicrohttpd-devel jansson-devel libnice-devel \
openssl-devel libsrtp-devel sofia-sip-devel glib-devel \
opus-devel libogg-devel pkgconfig gengetopt libtool autoconf automake
On Ubuntu or Debian, it would require something like this:
aptitude install libmicrohttpd-dev libjansson-dev libnice-dev \
libssl-dev libsrtp-dev libsofia-sip-ua-dev libglib2.0-dev \
libopus-dev libogg-dev pkg-config gengetopt libtool automake
- Note: please notice that libopus may not be available out of the box on Ubuntu or Debian, unless you're using a recent version (e.g., Ubuntu 14.04 LTS). In that case, you'll have to install it manually.
If your distro ships a pre-1.5 version of libsrtp, it may be better to uninstall that version and install 1.5 manually. In fact, 1.4.x is known to cause several issues with WebRTC. Installation is quite straightforward:
wget https://github.com/cisco/libsrtp/archive/v1.5.0.tar.gz
tar xfv v1.5.0.tar.gz
cd libsrtp-1.5.0
./configure --prefix=/usr --enable-openssl
make libsrtp.so && sudo make install
- Note: you may need to pass --libdir=/usr/lib64 to the configure script if you're installing on a x86_64 distribution.
If you want to make use of BoringSSL instead of OpenSSL for any reason (read here for some background on this), you'll have to manually install a specific version of the library to a specific location. Use the following steps:
git clone https://boringssl.googlesource.com/boringssl
cd boringssl
# We need a specific revision
git checkout 12fe1b25ead258858309d22ffa9e1f9a316358d7
# Don't barf on errors
sed -i s/" -Werror"//g CMakeLists.txt
# Build
mkdir -p build
cd build
cmake -DCMAKE_CXX_FLAGS="-lrt" ..
make
cd ..
# Install
sudo mkdir -p /opt/boringssl
sudo cp -R include /opt/boringssl/
sudo mkdir -p /opt/boringssl/lib
sudo cp build/ssl/libssl.a /opt/boringssl/lib/
sudo cp build/crypto/libcrypto.a /opt/boringssl/lib/
Once the library is installed, you'll have to pass an additional
--enable-boringssl flag to the configure script, as by default
Janus will be build assuming OpenSSL will be used. If you were using
OpenSSL and want to switch to BoringSSL, make sure you also do a
make clean in the Janus folder before compiling with the new
BoringSSL support.
For what concerns usrsctp, which is needed for Data Channels support, it is usually not available in repositories, so if you're interested in them (support is optional) you'll have to install it manually. It is a pretty easy and standard process:
git clone https://github.com/sctplab/usrsctp
cd usrsctp
./bootstrap
./configure --prefix=/usr && make && sudo make install
- Note: you may need to pass --libdir=/usr/lib64 to the configure script if you're installing on a x86_64 distribution.
The same applies for libwebsockets, which is needed for the optional WebSockets support. If you're interested in supporting WebSockets to control Janus, as an alternative (or replacement) to the default plain HTTP REST API, you'll have to install it manually:
git clone git://git.libwebsockets.org/libwebsockets
cd libwebsockets
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr -DCMAKE_C_FLAGS="-fpic" ..
make && sudo make install
-
Note: if libwebsockets.org is unreachable for any reason, replace the first line with this:
Finally, the same can be said for rabbitmq-c as well, which is needed for the optional RabbitMQ support. In fact, several different versions of the library can be found, and the versions usually available in most distribution repositories are not up-do-date with respect to the current state of the development. As such, if you're interested in integrating RabbitMQ queues as an alternative (or replacement) to HTTP and/or WebSockets to control Janus, you can install the latest version with the following steps:
git clone https://github.com/alanxz/rabbitmq-c
cd rabbitmq-c
git submodule init
git submodule update
autoreconf -i
./configure --prefix=/usr && make && sudo make install
- Note: you may need to pass --libdir=/usr/lib64 to the configure script if you're installing on a x86_64 distribution.
To conclude, should you be interested in building the gateway documentation as well, you'll need some additional tools too:
On Fedora:
yum install doxygen graphviz
On Ubuntu/Debian:
aptitude install doxygen graphviz
##Compile Once you have installed all the dependencies, get the code:
git clone https://github.com/meetecho/janus-gateway.git
cd janus-gateway
Then just use:
sh autogen.sh
to generate the configure file. After that, configure and compile as usual to start the whole compilation process:
./configure --prefix=/opt/janus
make
make install
To also automatically install the default configuration files to use, also do a:
make configs
If you're not interested in Data Channels, WebSockets and/or RabbitMQ (or you don't care about either of them) you can disable them when configuring:
./configure --disable-websockets --disable-data-channels --disable-rabbitmq
If Doxygen and graphviz are available, the process will also build the documentation for you. If you prefer not to build it, use the --disable-docs configuration option:
./configure --disable-docs
You can also selectively enable/disable other features (e.g., specific plugins you don't care about). Use the --help option when configuring for more info.
##Configure and start To start the gateway, you can use the janus executable. There are several things you can configure, either in a configuration file:
<installdir>/etc/janus/janus.cfg
or on the command line:
<installdir>/bin/janus --help
janus 0.1.0
Usage: janus [OPTIONS]...
-h, --help Print help and exit
-V, --version Print version and exit
-b, --daemon Launch Janus in background as a daemon
(default=off)
-N, --disable-stdout Disable stdout based logging (default=off)
-L, --log-file=path Log to the specified file (default=stdout only)
-i, --interface=ipaddress Interface to use (will be the public IP)
-P, --plugins-folder=path Plugins folder (default=./plugins)
-C, --config=filename Configuration file to use
-F, --configs-folder=path Configuration files folder (default=./conf)
-c, --cert-pem=filename HTTPS/DTLS certificate
-k, --cert-key=filename HTTPS/DTLS certificate key
-S, --stun-server=filename STUN server(:port) to use, if needed (e.g.,
gateway behind NAT, default=none)
-1, --nat-1-1=ip Public IP to put in all host candidates,
assuming a 1:1 NAT is in place (e.g., Amazon
EC2 instances, default=none)
-E, --ice-enforce-list=list Comma-separated list of the only interfaces to
use for ICE gathering; partial strings are
supported (e.g., eth0 or eno1,wlan0,
default=none)
-X, --ice-ignore-list=list Comma-separated list of interfaces or IP
addresses to ignore for ICE gathering;
partial strings are supported (e.g.,
vmnet8,192.168.0.1,10.0.0.1 or
vmnet,192.168., default=vmnet)
-6, --ipv6-candidates Whether to enable IPv6 candidates or not
(experimental) (default=off)
-l, --libnice-debug Whether to enable libnice debugging or not
(default=off)
-I, --ice-lite Whether to enable the ICE Lite mode or not
(default=off)
-T, --ice-tcp Whether to enable ICE-TCP or not (warning: only
works with ICE Lite)
(default=off)
-U, --bundle Whether to force BUNDLE or not (whether audio,
video and data will always be bundled)
(default=off)
-u, --rtcp-mux Whether to force rtcp-mux or not (whether RTP
and RTCP will always be muxed) (default=off)
-q, --max-nack-queue=number Maximum size of the NACK queue per user for
retransmissions
-r, --rtp-port-range=min-max Port range to use for RTP/RTCP (only available
if the installed libnice supports it)
-d, --debug-level=1-7 Debug/logging level (0=disable debugging,
7=maximum debug level; default=4)
-D, --debug-timestamps Enable debug/logging timestamps (default=off)
-o, --disable-colors Disable color in the logging (default=off)
-a, --apisecret=randomstring API secret all requests need to pass in order
to be accepted by Janus (useful when wrapping
Janus API requests in a server, none by
default)
-A, --token-auth Enable token-based authentication for all
requests (default=off)
Options passed through the command line have the precedence on those specified in the configuration file. To start the gateway, simply run:
<installdir>/bin/janus
This will start the gateway, and have it look at the configuration file. By default, only an HTTP webserver is started. To enable HTTPS support, edit the configuration file accordingly or use the command line. The webserver will make use of the same certificates provided for DTLS. You can also change the base path that the webserver uses: by default this is /janus, but you can change it to anything you want and with any nesting you want (e.g., /mypath, /my/path, or /my/really/nested/path). This is done to allow you to more easily customize rules in any frontend you may have (e.g., Apache in front of your services). Please notice that the path configuration has no effect on the WebSockets usage of the API, instead, as it is not needed there.
In the absence of a configuration file, the only mandatory options to specify in the command line are the ones related to the DTLS certificate. A default certificate is provided with this package in the certs folder, which you can use launching the executable with these parameters:
<installdir>/bin/janus -c /path/to/mycert.pem -k /path/to/mycert.key
At this point, the gateway will be listening on the 8088 port (or whatever you changed that to) of your machine. To test whether it's working correctly, you can use the demos provided with this package in the html folder: these are exactly the same demos available online on the project website. Just copy the file it contains in a webserver, and open the index.html page in either Chrome or Firefox. A list of demo pages exploiting the different plugins will be available.
##Help us! Any thought, feedback or (hopefully not!) insult is welcome!
Developed by @meetecho