I know nmap has mDNS service discovery script but it wasn't helpful in my case as it doesn't include the correct service names.
So I want to parse the following response as caught in wireshark, any idea on how can I get this response in C or Python program? can I use nmap for this or some special command that I can call via shell/Terminal?
(The one highlighted in blue)
In other words, I am interested in reading the following:
If you are writing your own program that uses mDNS – forget Wireshark and forget Nmap. Treat mDNS like any other network protocol that you'd implement, and make your own mDNS queries and receive responses through a standard UDP multicast socket instead of going through "packet captures" and such.
There are two ways to use DNS-SD service discovery via mDNS: either use the existing facilities provided by the OS, or use a library that directly builds queries and parses responses.
For example, in Linux, you often have avahi-daemon available as part of the distribution. It takes care of collecting service announcements, so all you need is the "libavahi-client" C library or the "avahi" Python module.
Similarly, in macOS, you would use one of the "DNS Service Discovery" APIs built in to the system (through mDNSResponder), e.g. old docs. Android and Windows UWP also have mDNS and DNS-SD built-in.
If you don't want to rely on external tools, then you'd use something like the "zeroconf" Python module which directly speaks mDNS through sockets.
I'm not sure which C library is preferred, although mjansson/mdns seems to be okay. The dns-sd GitHub tag has a few more.
You could in fact use a standard DNS library (maybe libldns?) for mDNS message parsing, as the mDNS wire protocol is 99% compatible with DNS; the only difference is in two flag definitions. Though if done this way, you'd still need to implement the DNS-SD discovery logic – there's more to it than just "passively wait for responses".
