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My task is to develop split tunnelling feature for macOS so if I am connected to a VPN connection only selected apps can send their traffic to the VPN while other apps will be using local internet connection.
I noticed other VPN apps like expressvpn offering these features but I couldn't find any help over the internet how to achieve that.
I haven't checked this myself but OpenVPN daemon exposes set of APIs which can be used to create multiple VPN tunnels for each application, as mentioned in your question.
So the solution of this problem is NKE, Apple's Network Kernel Extensions you can write your own kext which handles network operations on various levels.
I hope this clue will help someone in future.
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Essentially I've been trying to relay messages between two computers using c/c++ using standard socket programming. Everything works fine on LAN. The issue is making the connection using something like external ip address. I searched online and saw methods that mention ensuring the router is configured for "port forwarding". However, I was wondering how do peer to peer communication apps like qTox overcome this barrier, since they do not require that technical step? To summarize, how can I connect two sockets between two computers that are NOT on the same network?
here is some methods we usually use to solve the problem.
If you can use a server in WLAN as relay or central controller, it's quite simple. The computers connect to the server, the server change messages for them and can do many more operations.
If you don't want to use a server, then here is a problem: NAT devices may drop those packets which haven't established a connection according to their type. Here are four types: full cone NAT, restricted NAT, port restricted NAT and symmetric NAT. And here are some methods for this circumstance
2.1 Use NAT traversal algorithm, but they may not work well in symmetric NAT.
2.2 Use STUN/TURN/ICE to realise NAT traverse, it's quite reliable but need to learn how to use them.
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I tried to log in to my aws ec2 instance with putty. Every time I connect to my school wifi it keeps saying connection Time Out. But when I try to connect with my phone network it's working fine again.
I already set the security inbound rules to everyone, only myIP. but still not working.
Here is the error... "Network error!!!Connection Time Out"
Your School wifi must be operating behind a firewall and traffic is filtered. For example - in most companies only few sites are allowed to browse and rest all are blocked by firewall rules.
Port 22 is blocked in most of public networks. You can try connecting putty after connecting from your mobile network.
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I want to host a cpp service as a executable file and able to track the log, handle the exception and able to handle high load.
You can try c-sevice-interface https://github.com/Taymindis/c-service-interface
This is a small bridge engine which can handle high load of request, any segfault will not break the engine, it will catch and free the thread, it is built on top NGINX, FCGI. You can setup the proxy, load balance, authentication via NGINX before reach to your interface.
The link shown as below is a wiki to Guide you how to startup from scratch.
https://github.com/Taymindis/fcgi-function/wiki/How-to-build-a-cpp-service-on-c-service-interface
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I've written a simple TCP socket server in c++ that uses sys/socket and OpenSSL..
I wish to use this server in production and I haven't been able to find clear methods for testing a socket server at scale.
What are the best methods and/or tool for testing sockets?
Unless you want to write a custom test client, which obviously doesn't have to be in C++, there are some common tools that can be used to connect to your server. For example, you can use curl and telnet. Google for these tools and how to use them if you are not already familiar with them. The following answers might be helpful:
https connection using CURL from command line
https://superuser.com/questions/346958/can-the-telnet-or-netcat-clients-communicate-over-ssl
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How does it work? (Explain it in terms of server, writes, GETs, values, whatever).
DOes it work with Win32 apps?
I'll try to explain:
There is an application, with thrift
class/interface. When event that you
want to log occures, you send
message to the
Server, which collect logs from many
sources (application, server logs,
etc)
And then server decides what do
do with it: generate visualization,
send over tcp/ip, store in a file,
nfs, hdfs, you decide.
Server and client can be the same
app or machine, or this log data can
be sent from client over internet.
Definitely works with win32 apps.
It Works Great.
We're using Scribe to test some message processing.
We're sending Apache logs with Scribe. (Under Ubuntu)