Can we do IP scanning using QT

[kuzulis]

You can try to use the nmap utility or its library to do a network scanning.

[ManiRon]

@kuzulis it is a little tough to understand and the flow of the code is also tough to understand, Thats why looking for an alternate way

[ManiRon]

@kuzulis i am not having clarity on how to use its library file with my application

[jsulm]

@ManiRon Pass an URL to connectToHost instead of IP

[ManiRon]

@jsulm said in Can we do IP scanning using QT:

connectToHost

I passed an URL but the client is not connecting to the server,

client side :

QTcpSocket *tcpSocket;
tcpSocket->connectToHost("www.test.com", 6547);

server side :

 QTcpServer *tcpServer;
 tcpServer->listen(QHostAddress::Any, 6547)

[closx]

@ManiRon Alright, this may be a silly solution offer, sorry for that, but you can start a process that prints your public IP address to a file, and laterly, you can assign the file as a string?

QProcess process;
process.start("curl ifconfig.me > ipaddress");
//Saves the public IP address as the file "ipaddress"
//You may delete the file with another process if you want.
QString fname="ipaddress";
QFile file(fname);
QString ip;
if (file.open(QIODevice::ReadOnly | QIODevice::Text)){
   QTextStream stream(&file);
   while (!stream.atEnd()){
            ip = stream.readLine();
    }
}
file.close();

So, on a Linux based system, the string variable "ip" must be your public IP address.

[jsulm]

@ManiRon said in Can we do IP scanning using QT:

www.test.com

is this the host name of your server?

[jsulm]

@closx He needs the IP of his server which not necessarily runs on same machine...

[closx]

@jsulm said in Can we do IP scanning using QT:

@closx He needs the IP of his server which not necessarily runs on same machine...

Then we can replace the code with

QProcess process;
process.start("dig +short test.com > ipaddress");
QString fname="ipaddress";
QFile file(fname);
QString ip;
if (file.open(QIODevice::ReadOnly | QIODevice::Text)){
   QTextStream stream(&file);
   while (!stream.atEnd()){
            ip = stream.readLine();
    }
}
file.close();

Didn't I still get the main problem? Am I retarded? lmao

[jsulm]

@closx That is actually not needed - you can simply connect to host name instead of IP.

[ManiRon]

This post is deleted!

[ManiRon]

@jsulm how to set the host name of server ? can you provide me an example ?

[jsulm]

@ManiRon Read the manual of your server or OS.
For Ubuntu Linux for example see https://www.cyberciti.biz/faq/ubuntu-change-hostname-command/

[ManiRon]

@jsulm i want for windows

[mrjj]

@ManiRon
Its very easy to find on google
https://www.cnet.com/how-to/how-to-change-your-computers-name-in-windows-10/
Make sure it matches the Windows OS you are using.

[ManiRon]

@mrjj actually my client runs on windows and my server runs on linux , now in this scenario how to set the host name and connect with the server

[mrjj]

@ManiRon
If the server is Linux, it's like @jsulm showed.
The host name of the server is not related to the client. nothing needs to be done client side
for server to have a hostname/name.
Its just an alternative to the pure IP.

Howver, is the server on the same network as you ? ( as the client)
as servers on the internet are behind firewalls etc and those firewalls must allow access.

[ManiRon]

@mrjj three systems which are connected one to one

[mrjj]

@ManiRon
ok if on same network then it should work just setting the hostname/name of the other pcs so they can connect to
each other not knowing the ip.