libcli/dns tcp

[Dimitris Gravanis]

Hi,

I attach to you two files concerning tcp packets from the client, 
heavily based on the existing work on libcli/dns and dns_server.

tstream_read_pdu_blob_send() and tstream_read_pdu_blob_recv() don't 
appear to be defined in tsocket, I went on to use 
tstream_readv_pdu_send()/recv() instead to handle the request, though 
there are some things I need clarification on (see 85, 127 in dns_tcp.c).

I have set up a GitHub repo <https://github.com/dimgrav/Samba-GSOC2017> 
for the time being, all changes are pushed there.

Cheers,

Dimitris

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