I want to make traceroute in the browser via flash. I asked about ICMP packets, but another alternative would be UDP packets if I could set the TTL. However, I don't see that option in flash.net.DatagramSocket. Is it possible?
You cannot use UDP in a web browser via flash. the Datagram socket is only accessible when running in the AIR player.
Your best option is a signed java applet.
Related
How does Javascript send udp broadcast on the LAN in chrome
I plan to make an application that send udp broadcast on the LAN. I wish all code are in html/js and it works on Windows and MacOS.
The work flow is - JS websocket connect to my wss server, run a chrome extension connect to wss server also. JS send wss packet to wss, and chrome extension get wss command, and chrome extension send udp broadcast on the LAN, get udp response, then send back to wss and web client.
Is that possible? or do you have better idea?
Using Zabbix 4.2 I detect that a device, more specifically, an Access Point, shows an alert saying that, the mentioned device is unavailable by ICMP Ping.
Does this mean that the mentioned device is offline or that it has been turned off?
I want to make multiplayer game, and I want it to use UDP sockets. Because of that, I want to use DatagramSocket. The problem is that DatagramSocket needs to be bound to a port on both sides. Is there a way to create a server - client program with UDP that does not need the client to portforward? (Like Serversocket and Socket).
Remember that UDP is connectionless. You send a packet of data to some IP address and hope it knows what to do with it once it gets to the targeted machine. But actually once it's on the machine it has no idea where to go from there, is there an application that's interested in these packets? And this is precisely why you need to specify a port number that is registered to forward packets to specific application on the machine.
Send a packet to myself to the application running on port 7000: 127.0.0.1 : 7000
Is it possible to communicate with UDP sockets via Chrome Extensions? I want to be able to have browser actions AND the ability to just send messages to UDP sockets.
No, it's not possible.
You either have to use both an app and an extension that communicate, or use an extension and a Native Host.
Is it possible to have a TCP Socket server running which accepts incoming connections from WebSocket clients? I have a TCP Socket server and I'd like to be able to test this in a browser. Is this possible?
Absolutely! That is the purpose of websockify.
Of course your WebSocket client application will need to be able to implement the protocol of the TCP server. For example, noVNC is a browser VNC client that implements the RFB protocol and by using websockify it can connect to a normal TCP based VNC server.
Disclaimer: I created both websockify and noVNC
TCP and WebSocket are not the same protocol or framing, so wiring them up blindly isn't going to work. Well ... technically, websocket is an upgrade of http which is layered on ssl (optionally) which in turn is layered on tcp.
TCP can be thought of as a stream of bytes, while WebSocket is a set frames.
WebSocket frames can be any of the following:
TEXT - consists of 1 or more frames making up a single UTF8 message
BINARY - consists of 1 or more frames making up a byte array message
CONTINUATION - used by TEXT and BINARY to piece together 2 or more frames.
PING - obvious
PONG - obvious
CLOSE - request a close/disconnect of the protocol.
In short, you'd need to implement the websocket protocol framing in order to have TCP wired up to websocket. And you'll need to implement basic HTTP UPGRADE in order to reach that point.