Using IP address extracted from net interface

[arietto]

Hello! If I use the following snippet (in ini file)

[wsgi]
http-socket=3000

will REST server listen on all net interfaces?
Is it possible in future to put net interface name instead of hardcoded IP address?
For example,

net_interface=`eth0` 
local_port=3000
http_ver=1

It will be transformed programmatically into http-socket=192.168.21.50:3000.
I use the following heuristics (for IPv4) in other project (works for Linux (like eth0) and human-readable net interface names in Windows):

QString get_local_ip_by_interface(const QString & net_interface)
{
 if (net_interface.isEmpty())
 {
  return QString();
 }
 QList<QNetworkInterface> net_interface_list = QNetworkInterface::allInterfaces();
 for (const auto & current_interface : qAsConst(net_interface_list))
 {
  QNetworkInterface::InterfaceFlags flags = current_interface.flags();
  if ((flags & QNetworkInterface::IsRunning) &&
  ((current_interface.name() == net_interface) ||
  (current_interface.humanReadableName() == net_interface)))
  {
   auto address_entries = current_interface.addressEntries();
   for (const auto& addr : qAsConst(address_entries))
   {
    auto host_addr = addr.ip();
    if (host_addr.protocol() == QAbstractSocket::IPv4Protocol)
    {
     return addr.ip().toString();
    }
   }
  }		
 }
 return QString();
}//end

[dantti]

The proper syntax for all ip addresses is:
http-socket=:3000

It would be confusing to have:
http-socket=eth0:3000

because eth0 is expected to be a hostname such as:
http-socket=localhost:3000

I can't really think on a good syntax for this, does uWSGI supports this?

[arietto]

Hello! I mean that we can add optional parameters:
net_interface=eth0
local_port=3000
http_ver=1.1
They will be used if http-socket is absent. http_ver=1.1 means autogeneration for http-socket.
cutelyst-wsgi2 will implicitly generate resulting string (in-memory):
http-socket=192.168.21.95:3000

[dantti]

Ok, I had an idea, option --http-iface=eth0:3000, --https-iface=eth0:3000, --fcgi-iface=eth0:3000 and --h2-iface=eth0:3000.

Which will resolve the interface addresses and append them to the http-socket list, can you do a PR for this?

[arietto]

I have no time at the moment (though I have done some primary dirty stuff in local copy). Should I consider only IPv4? Perhaps, I'll try to make a PR in mid-April.

[dantti]

Well both IPv4 and IPv6 should be supported

[arietto]

BTW, could you please explain parsing address & port in bool TcpServerBalancer::listen(const QString &line, Protocol *protocol, bool secure) method? When and why comma, square bracket symbols should be considered?

[dantti]

it's [IP]:PORT,ssl-cofig-files same syntax of uWSGI.