03_resolve-port-names.diff

03_resolve-port-names.diff

This patch allows to resolve port numbers into names defined
in the services(5) /etc/services database:
 (a) it provides a standalone function which will fall back to
     stringifying a port number;
 (b) it resets the 'numeric service' flag of getnameinfo(3) to
     analogously consider a lookup in /etc/services.

Assuming the following had been added to /etc/services:
para_server_control	2990/tcp	# para_server control
paraslash_http_service	8000/tcp        # paraslash http sender
paraslash_dccp_service	8000/dccp       # paraslash dccp sender
paraslash_udp_service	8000/udp        # paraslash udp sender,

then the output of 'para_client si' would look like:

http sender:
        status: on
        port: paraslash_http_service
        ...
dccp sender:
        status: on
        port: paraslash_dccp_service
        ...
udp sender:
        status: on
        port: paraslash_udp_service
        ...

Note: On some systems the service lookup may involve LDAP or NIS lookups,
depending on the 'services' configuration in /etc/nsswitch.conf. This does
not seem to cause a problem, as it implies a working network connection.