I'm working on a data sharing app using node js, the idea is to create an application that can connect peers using node-js without using any kind of central dependency i.e a signalling server or something of its kind. After a lot of research I'm always back to this diagram but it only makes sense if there is no signalling server I'm targeting LAN networks so that I don't have to deal with NAT.
To be specific, I would like some to answer these specific question
Is it possible to connect to webrtc on LAN, i.e the webrtc connection will connect using my client's ip
Is it possible to use websockets without a central server, or something like websockets
Is it possible to connect two clients on LAN using node js without using any hardcoded Ips or asking users to enter ip.
Since you are using node.js, you can very well use raw UDP (dgram) and use UDP broadcasting for device discovery - then you do not need any form of centralization required by websockets/webRTC.
The answer to all your questions is Yes!
Also, there is a lof WebRTC server that you can use them on a simple Linux box, like Janus, Kurento, etc. I've tested them and they have worked with some mischief, lol. So, run it and next read their API to exchange anything you want on their medium.
I'm not sure about Janus but the Kurento has a nodeJS client itself. Read the Local Installation and JavaScript Kurento Client.
Additionally, if you want to make a WebSocket connection, it has enabled by default configuration.
To change the port, enter this command at the final step:
npm start -- --ws_uri=ws://https://185.164.72.144/:8888/kurento --as_uri=https://185.164.72.144:6008/
Related
I'm trying to develop a web application in nodejs. I'm using an npm package called "simple-peer" but i don't think this issue is related to that. I was able to use this package and get it working when integrating it with a laravel application using an apache server as the back end. I could access the host machine through it's IP:PORT on the network and connect a separate client to the host successfully with a peer-to-peer connection. However, I'm now trying to develop this specifically in node without an apache back end. I have my express server up and running on port 3000, I can access the index page from a remote client on the same network through IP:3000. But when I try to connect through webrtc, I get a "Connection failed" error. If I connect two different browser instances on the same localhost device, the connection succeeds.
For reference: i'm just using the copy/pasted code from this usage demo. I have the "simplepeer.min.js" included and referenced in the correct directory.
So my main questions are: is there a setting or some webRTC protocol that could be blocking the remote clients from connecting? What would I need to change to meet this requirement? Why would it work in a laravel/webpack app with apache and not with express?
If your remote clients can not get icecandidates, you need TURN server.
When WebRTC Peer behind NAT, firewall or using Cellular Network(like smartphone), P2P Connection will fail.
At that time, for fallback, TURN server will work as a relay server.
I recommend coTURN.
Here is an simple implementation of simple-peer with nodejs backend for multi-user video/audio chat. You can find the client code in /public/js/main.js. Github Project and the Demo.
And just like #JinhoJang said. You do need a turn server to pass the information. Here is a list of public stun/turn servers.
Suppose I have 2 servers. I want to establish a connection between them using socket.io library, and one of them would reach another by .onion link using SOCKS proxy. all the traffic between servers should also go through tor.
I was able to create a simple net socket using onion links, but cannot find how to pass it to socket.io. Is it possible to make socket.io using existing net socket? or maybe there is another way to achieve the ultimate goal?
I have some working experiences with socket.io, but not with the other technologies you mention (so I can't resolve your question entirely). Until someone else resolves it, I will show you a link with about the two modules socket.io-redis and socket.io-emitter that allow socket.io to communicate with the "outside world":
https://socket.io/docs/rooms-and-namespaces/#sending-messages-from-the-outside-world
I'm making a nodejs application that will act a server for other sites in different countries as the data being transmitted will be business related data. I would like to know how I can safely/securely send this data.
I am currently using socket.io to act as my main server (Master) on other sites there are (Slave) servers that handle the data from the master server.
I have got this working in a local environment but want to deploy this in the other sites.
I have tried to Google this to see if anyone else has done this but came across socket.io sessions but I don't know if this will fit with (Server->Server) connections.
Any help or experience would be grateful.
For server-server communication where you control both ends of the communication you can use WebSocket over HTTPS, you can use TCP over SSH tunnel or any other encrypted tunnel. You can use a PubSub service, a queue service etc. There are a lot of ways you can do it. Just make sure that the communication is encrypted either natively by the protocols you use or with VPN or tunnels that connect your servers in remote locations.
Socket.io is usually used as a replacement for WebSocket where there is no native support in the browser. It is rarely used for server to server communication. See this answer for more details:
Differences between socket.io and websockets
If you want a higher level framework with focus on real-time data then see ActionHero:
https://www.actionherojs.com/
For other options of sending real-time data between servers you can use some shared resource like a Redis database or some pub/sub service like Faye or Kafka, or a queue service like ZeroMQ or RabbitMQ. This is what is usually done to make things like that work across multiple instances of the server or multiple locations. You could also use a CouchDB changes feed, or a similar feature of RethinkDB to make sure that all of your instances get all the data as soon as it is posted by any one of them. See:
http://docs.couchdb.org/en/2.0.0/api/database/changes.html
https://rethinkdb.com/docs/changefeeds/javascript/
https://redis.io/topics/pubsub
https://faye.jcoglan.com/
https://kafka.apache.org/
Everything that uses HTTP is easy to encrypt with HTTPS. Everything else can be encrypted with a tunnel or VPN.
Good tools that can add encryption for protocols that are not encrypted themselves (like e.g. the Redis protocol) are:
http://www.tarsnap.com/spiped.html
https://www.stunnel.org/index.html
https://openvpn.net/
https://forwardhq.com/help/ssh-tunneling-how-to
See also:
https://en.wikipedia.org/wiki/Tunneling_protocol
Note that some hosting services may give you preconfigured tunnels or internal network interfaces that pass data encrypted between your servers located in different data centers of that provider. Some providers give you tools and tutorials to that easily as well.
I'm working in a project where we need to connect clients to devices behind LAN networks.
Brief description: there are "devices" connected, in a home for example, under a LAN created by a router. These devices create a full webserver, operating under linux, and using nodejs as the backend implementation language. They also have access to Internet, through the public IP of the router. On the other side, there are clients which can choose to which device to connect to.
The goal is to connect the clients with the webServer created by any device.
Up to now, my idea is to try to implement something similar to how TeamViewer works. As I understand, Teamviewer has a central server, which the agents connect to. When an agent connects to the central server, this one gets hold of the TCP connection, keeping it alive. When another client wants to access to the first client, the server bypasses both TCP connections. That way the server acts like a proxy, where it additionally routes the TCP connections. This also allows to connect to clients under LAN or firewalls (because the connections are created always from the clients).
If this is correct, what I would like to implement is a central server, in nodejs as well, which manages a pool of socket connections coming from the different active devices, and when a client wants to connect to one specific device, the server bypasses the incoming TCP connection of the client with the already existing connection of the device.
What I first would like to know is if this is possible in nodejs. My idea is to keep the device connections alive, so clients can inmediately connect to them, creating some sort of pool of device connections.
If implemented in C, I guess I could get hold of the socket descriptor, keeping it alive, and bypassing it to the incoming client request. But in nodejs I can't seem to find any modules that manage TCP connections.
Are there any high level npm packages which do this function? Else, is it possible to use lower level modules (like net) which have those functionalities.
Ideally I would like to implement it with high level modules (express), but if it's not possible, I could always rewrite the server using low level modules.
Thanks in advance
I'm developing chat application using app.js which is webkit+node.js framework.
So i have node.js plus bridged web browser environment on both sides.
I want to make file transfer feature somewhat similar to Skype one.
So, initial idea is to:
1.connect clients to main server.
2.Each client gets ip of oposite ones.
3.Start socket or websocket server on both clients and connect to each other.
4.Sender reads the file and transmits it to the reciver.
Question are:
1.Im not really sure that one client can "see" the other.
2.file is a binary data, but websockets are made for text messages so i need some kind of coding/decoding stuff. I thought about base 64 but it has 30% of "overhead" information. So i need something more effitient (base 128?).
3.If it is not efficient to use websocket should i use TCP sockets instead? What problems can appear if i decide to use them?
Yeah i know about node2node and BinaryJS, i just dont know should i use them or not. And i really what to do something myself.
OK, with your communication looking like this:
(C->N)<->N<->(N->C)
(...) is installed on one client's machine. N's are node servers, C's are web clients.
This is out of your control. Some file sharing apps send test packets from the central server to clients, to check whether ports are open and NAT rules are configured correctly, etc. Your clients will start their own servers on some port, your master server can potentially create a test connection to these servers to see whether they're started correctly and open to the web, BEFORE telling other clients that they can send files.
Websockets are great for status messages from your servers to the web GUIs and general client-to-client communication. For the actual file transfers, I would use TCP sockets, see the next answer. On the other hand base64 encoding is really not a slow process, play with it and benchmark its performance, then decide with some data to back up your decision.
You could use a combination: websockets from your servers to the web GUIs, but TCP communication between the servers themselves. TCP servers (and streams) aren't hard to set up in Node, I see no disadvantages. It might actually be less complicated than installing node2node on those servers, since TCP is already built-in.