I'm using https://github.com/farhadi/node-smpp in order to create a smpp server.
I'm going to forbid connection if the client's IP address is not in the allowed ips list. For that when a new connection is open I have to check if the credentials are ok and if the IP address is a good one.
The question is how and where can I get the client (ESME's) IP address?
session.on('bind_transceiver', function(pdu) {
session.pause();
const username = pdu.system_id;
const password = pdu.password;
const ipAddress = ''; // WHERE TO GET IT??
if (credentialsAreOk(username, password, ipAddress)) {
session.send(pdu.response());
session.resume();
} else {
session.close();
}
});
When an ESME is connecting to your server, a session is created.
The network socket used by this TCP connection, which is a net.Socket class ( https://nodejs.org/api/net.html.net_class_net_socket ), is stored inside this session in the socket property.
const socket = session.socket;
So you can easily access this socket property of the session and get the remoteAddress (the clients IP) from there ( https://nodejs.org/api/net.html.net_socket_remoteaddress ).
const ipAddress = session.socket.remoteAddress;
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