gabonator · November 26, 2017 20:05 · Amadeus23000 · Dec 10, 2020 · Delitants · Dec 11, 2020
diff --git a/abcom_protocol.js b/abcom_protocol.js
 /*
 reverse engineering of ABcom Cryptobox 600HD mini dvbs box protocol
 
 Firstly I examined android package (since it was easier to get it) "g-mscreen-2-3-11.apk". It
 uses C++ library for implementing control protocol. Then I was trying to capture UPnP communication
 from iphone connected to OSX running wireshark. But without luck. GMScreen allowed to connection
 to box using ip address and port. This traffic was easier to caputre and analyse. Requests by
 client application are human readable json/xml code. Some response packets are compressed using
 zlib.
 
 nm -D -C libdvbtoip.so | grep DVB
 0000f0a0 T DVBtoIP::initialize()
 0006cf10 B DVBtoIP::_serverList
 0006cf0c B DVBtoIP::_clientHandle
 0000f838 T DVBtoIP::getChannelURL(char const*)
 0000f678 T DVBtoIP::getServerList(bool)
 000103f4 T DVBtoIP::getChannelList(char const*, bool)
 0000f0a8 T DVBtoIP::getChannelUserKey(char const*)
 00010210 T DVBtoIP::updateChannelList(char*)
 0000f1dc T DVBtoIP::initResourceForPlayer(int, char const*, int, int)
 0000fc60 T DVBtoIP::upnpClientEventCallback(Upnp_EventType_e, void*, void*)
 0000f49c T DVBtoIP::destroyResourceForPlayer()
 0000fff8 T DVBtoIP::updateChannelListParseBuffer(char*, int*, std::map.....)
 0000f0a4 T DVBtoIP::cleanup()
 0006cf28 B DVBtoIP::_isInit
 0000f1b4 T DVBtoIP::setSeed(int)
 0000f790 T DVBtoIP::DVBtoIP()
 0000f790 T DVBtoIP::DVBtoIP()
 0000f5d4 T DVBtoIP::~DVBtoIP()
 0000f590 T DVBtoIP::~DVBtoIP()
 0000f590 T DVBtoIP::~DVBtoIP()
 */

 var net = require('net');
 const zlib = require('zlib');

 const decompress = (buffer, handler) => zlib.unzip(buffer, {}, (err, buffer) => {err || handler(buffer.toString()); });
 const alibuffer = (buffer) => "Start" + ("0000000" + buffer.length).substr(-7) + "End" + buffer;
 const alijson = (json) => alibuffer(JSON.stringify(json));

 satbox = new net.Socket();

 satbox.connect(20000, "192.168.1.77", () =>
 {
  console.log('Satellite box connected');
  satbox.write(alibuffer("<?xml version='1.0' encoding='UTF-8' standalone='yes' ?><Command request=\"998\" />"));
  //satbox.write(alijson({request:"22"})); // list of satellites
  //satbox.write(alijson({request:"14"})); // ProductName, SoftwareVersion, MaxNumOfPrograms, cur_channel_list_type...
  //satbox.write(alijson({request:"15"})); // StbStatus, ProductName, SoftwareVersion
  //satbox.write(alijson({request:"4"})); // no response
  satbox.write(alijson({request:"24"})); // unknown binary response
  //satbox.write(alijson({request:"0",FromIndex:"0",ToIndex:"10"})); // "ServiceID":"00010013405044", "ServiceName":"Markiza HD"
  //satbox.write(alijson({"request":"1009","TvState":"0","ProgramId":"00010012413208"})); // streaming request?
  //satbox.write(alijson({"request":"1040","array":[{"KeyValue":"1"}]})); // key up
  //satbox.write(alijson({"request":"1040","array":[{"KeyValue":"2"}]})); // key down
 });

 satbox.on('close', () => console.log('Connection closed'));
 satbox.on('data', (data) =>
 {
  if (data[0] == 0x5b && data[1] == 0x5b)
    console.log(data); // unknown encoding
  else if (data[0] == 0x78 && data[1] == 0x9c) // gzip
    decompress(data, (decompressed) => console.log(decompressed));
  else if (data.length == 16 && data.toString().substr(0, 4) == "GCDH")
  {} // ack header before data
  else
    console.log(data);
 });

 /*
 [{
 "StbStatus":    1,
 "ProductName":    "600HD Mini",
 "SoftwareVersion":    "1.09.17769_patch",
 "SerialNumber":    "170428042664",
 "ChannelNum":    281,
 "MaxNumOfPrograms":    6100
 }]
 */
	/*
	reverse engineering of ABcom Cryptobox 600HD mini dvbs box protocol

	Firstly I examined android package (since it was easier to get it) "g-mscreen-2-3-11.apk". It
	uses C++ library for implementing control protocol. Then I was trying to capture UPnP communication
	from iphone connected to OSX running wireshark. But without luck. GMScreen allowed to connection
	to box using ip address and port. This traffic was easier to caputre and analyse. Requests by
	client application are human readable json/xml code. Some response packets are compressed using
	zlib.

	nm -D -C libdvbtoip.so \| grep DVB
	0000f0a0 T DVBtoIP::initialize()
	0006cf10 B DVBtoIP::_serverList
	0006cf0c B DVBtoIP::_clientHandle
	0000f838 T DVBtoIP::getChannelURL(char const*)
	0000f678 T DVBtoIP::getServerList(bool)
	000103f4 T DVBtoIP::getChannelList(char const*, bool)
	0000f0a8 T DVBtoIP::getChannelUserKey(char const*)
	00010210 T DVBtoIP::updateChannelList(char*)
	0000f1dc T DVBtoIP::initResourceForPlayer(int, char const*, int, int)
	0000fc60 T DVBtoIP::upnpClientEventCallback(Upnp_EventType_e, void, void)
	0000f49c T DVBtoIP::destroyResourceForPlayer()
	0000fff8 T DVBtoIP::updateChannelListParseBuffer(char, int, std::map.....)
	0000f0a4 T DVBtoIP::cleanup()
	0006cf28 B DVBtoIP::_isInit
	0000f1b4 T DVBtoIP::setSeed(int)
	0000f790 T DVBtoIP::DVBtoIP()
	0000f790 T DVBtoIP::DVBtoIP()
	0000f5d4 T DVBtoIP::~DVBtoIP()
	0000f590 T DVBtoIP::~DVBtoIP()
	0000f590 T DVBtoIP::~DVBtoIP()
	*/

	var net = require('net');
	const zlib = require('zlib');

	const decompress = (buffer, handler) => zlib.unzip(buffer, {}, (err, buffer) => {err \|\| handler(buffer.toString()); });
	const alibuffer = (buffer) => "Start" + ("0000000" + buffer.length).substr(-7) + "End" + buffer;
	const alijson = (json) => alibuffer(JSON.stringify(json));

	satbox = new net.Socket();

	satbox.connect(20000, "192.168.1.77", () =>
	{
	console.log('Satellite box connected');
	satbox.write(alibuffer("<?xml version='1.0' encoding='UTF-8' standalone='yes' ?><Command request=\"998\" />"));
	//satbox.write(alijson({request:"22"})); // list of satellites
	//satbox.write(alijson({request:"14"})); // ProductName, SoftwareVersion, MaxNumOfPrograms, cur_channel_list_type...
	//satbox.write(alijson({request:"15"})); // StbStatus, ProductName, SoftwareVersion
	//satbox.write(alijson({request:"4"})); // no response
	satbox.write(alijson({request:"24"})); // unknown binary response
	//satbox.write(alijson({request:"0",FromIndex:"0",ToIndex:"10"})); // "ServiceID":"00010013405044", "ServiceName":"Markiza HD"
	//satbox.write(alijson({"request":"1009","TvState":"0","ProgramId":"00010012413208"})); // streaming request?
	//satbox.write(alijson({"request":"1040","array":[{"KeyValue":"1"}]})); // key up
	//satbox.write(alijson({"request":"1040","array":[{"KeyValue":"2"}]})); // key down
	});

	satbox.on('close', () => console.log('Connection closed'));
	satbox.on('data', (data) =>
	{
	if (data[0] == 0x5b && data[1] == 0x5b)
	console.log(data); // unknown encoding
	else if (data[0] == 0x78 && data[1] == 0x9c) // gzip
	decompress(data, (decompressed) => console.log(decompressed));
	else if (data.length == 16 && data.toString().substr(0, 4) == "GCDH")
	{} // ack header before data
	else
	console.log(data);
	});

	/*
	[{
	"StbStatus": 1,
	"ProductName": "600HD Mini",
	"SoftwareVersion": "1.09.17769_patch",
	"SerialNumber": "170428042664",
	"ChannelNum": 281,
	"MaxNumOfPrograms": 6100
	}]
	*/