tor-android/external/badvpn_dns/ncd/examples/tcp_echo_server.ncd

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process main {
getargs() args;
value(args) args;
num_different(args.length, "2") bad_args;
If (bad_args) {
println("bad arguments");
exit("1");
};
args->get("0") addr_ip;
args->get("1") addr_port;
sys.listen({"tcp", {"ipv4", addr_ip, addr_port}}, "client_handler", {}) listener;
If (listener.is_error) {
println("failed to listen");
exit("1");
};
println("listening");
}
template client_handler {
to_string(_socket.client_addr) addr_str;
println("client ", addr_str, ": connected");
rprintln("client ", addr_str, ": disconnected");
_socket->write("This echo server is implemented in NCD!\n\n");
backtrack_point() recv_point;
_socket->read() data;
If (data.not_eof) {
_socket->write(data);
recv_point->go();
};
_socket->close();
}