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    <p>you'll not get it so easily, the tftp protocol is relatively easy, but put/get is not stateless, or at least if the file does not fit in a single packet, that is something like 512, but some extensions allow a bigger packet</p> <p>the file on the wire is splited and you'll get a sequence of packets each packet has a sequence number so the other end can send error for a specific packet</p> <p>you should take a look at wikipedia page:</p> <p><a href="http://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol" rel="nofollow">http://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol</a></p> <p>here a sample code I wrote in 2005 but id does the specular thing (it sends a file) it's python but reasonably similar to ruby :D</p> <pre><code>def send_file(self, addr, filesend, filesize, blocksize): print '[send_file] Sending %s (size: %d - blksize: %d) to %s:%d' % (filesend, filesize, blocksize, addr[0], addr[1]) fd = open(filesend, 'rb') for c in range(1, (filesize / blocksize) + 2): hdr = pack('!H', DATA) + pack('!H', c) indata = fd.read(blocksize) if debug &gt; 5: print '[send_file] [%s] Sending block %d size %d' % (filesend, c, len(indata)) self.s.sendto(hdr + indata, addr) data, addr = self.s.recvfrom(1024) res = unpack('!H', data[:2])[0] data = data[2:] if res != ACK: print '[send_file] Transfer aborted: %s' % errors[res] break if debug &gt; 5: print '[send_file] [%s] Received ack for block %d' % (filesend, unpack('&gt;H', data[:2])[0] + 1) fd.close() ## End Transfer pkt = pack('!H', DATA) + pack('&gt;H', c) + NULL self.s.sendto(pkt, addr) if debug: print '[send_file] File send Done (%d)' % c </code></pre> <p>you can find constants in arpa/tftp.h (you need a unix or search online)</p> <p>the sequence number is a big endian (network order) short !H format for struct pack ruby has something like python struct in String class</p>
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    1. COI think that the ruby equiv of pack is actually in array. (`[3,4,5].pack('H')`) http://www.ruby-doc.org/core/classes/Array.html#M000206
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