Esempio n. 1
0
    else:
        flkey = 'files'
        flval = fs

        outpath = input['files'][0]['outpath']
        l = filename2pathlist(outpath)
        name = l[0]
        
    infodict =  { 'piece length':num2num(piece_length), flkey: flval, 
            'name': uniconvert(name,encoding),
            'name.utf-8': uniconvert(name,'utf-8')}
    
    if 'live' not in input:
        
        if input['createmerkletorrent']:
            merkletree = MerkleTree(piece_length,totalsize,None,pieces)
            root_hash = merkletree.get_root_hash()
            infodict.update( {'root hash': root_hash } )
        else:
            infodict.update( {'pieces': ''.join(pieces) } )
    else:
        # With source auth, live is a dict
        infodict['live'] = input['live']

    if 'cs_keys' in input:
        # This is a closed swarm - add torrent keys
        infodict['cs_keys'] = input['cs_keys']

    if 'ns-metadata' in input:
        # This has P2P-Next metadata, store in info field to make it
        # immutable.
Esempio n. 2
0
    def setUpPostSession(self):
        """ override TestAsServer """
        TestAsServer.setUpPostSession(self)

        # Let Tribler start downloading an non-functioning torrent, so
        # we can talk to a normal download engine.
        self.tdef = TorrentDef()
        self.sourcefn = os.path.join(os.getcwd(),"API","file2.wmv")
        self.tdef.add_content(self.sourcefn)
        self.tdef.set_create_merkle_torrent(True)
        self.tdef.set_tracker("http://127.0.0.1:12/announce")
        self.tdef.finalize()

        self.torrentfn = os.path.join(self.session.get_state_dir(),"gen.torrent")
        self.tdef.save(self.torrentfn)
        
        dscfg = self.setUpDownloadConfig()
        
        self.session.start_download(self.tdef,dscfg)

        self.infohash = self.tdef.get_infohash()
        self.mylistenport = 4810
        
        self.numpieces = (self.tdef.get_length()+self.tdef.get_piece_length()-1) / self.tdef.get_piece_length()
        b = Bitfield(self.numpieces)
        for i in range(self.numpieces):
            b[i] = True
        self.assert_(b.complete())
        self.seederbitfieldstr = b.tostring()

        #piece_hashes = ['\x01\x02\x03\x04\x05\x06\x07\x08\x07\x06\x05\x04\x03\x02\x01\x00\x01\x02\x03\x04' ] * npieces
        # Construct Merkle tree
        tdef2 = TorrentDef()
        tdef2.add_content(self.sourcefn)
        tdef2.set_create_merkle_torrent(False)
        tdef2.set_tracker("http://127.0.0.1:12/announce")
        tdef2.set_piece_length(self.tdef.get_piece_length())
        tdef2.finalize()
        metainfo = tdef2.get_metainfo()
        
        piecesstr = metainfo['info']['pieces']
        print >>sys.stderr,"test: pieces has len",len(piecesstr)
        piece_hashes = []
        for i in range(0,len(piecesstr),20):
            hash = piecesstr[i:i+20]
            print >>sys.stderr,"test: piece",i/20,"hash",`hash`
            piece_hashes.append(hash)
            
        print >>sys.stderr,"test: Putting",len(piece_hashes),"into MerkleTree, size",self.tdef.get_piece_length(),tdef2.get_piece_length()
        
        self.tree = MerkleTree(self.tdef.get_piece_length(),self.tdef.get_length(),None,piece_hashes)
        
        
        f = open(self.sourcefn,"rb")
        piece1 = f.read(2 ** 18)
        piece2 = f.read(2 ** 18)
        print >>sys.stderr,"read piece1",len(piece1)
        print >>sys.stderr,"read piece2",len(piece2)
        f.close()
        hash1 = sha(piece1).digest()
        hash2 = sha(piece2).digest()
        print >>sys.stderr,"hash piece1",`hash1`
        print >>sys.stderr,"hash piece2",`hash2`
        f2 = open("piece1.bin","wb")
        f2.write(piece2)
        f2.close()
Esempio n. 3
0
        outpath = input['files'][0]['outpath']
        l = filename2pathlist(outpath)
        name = l[0]

    infodict = {
        'piece length': num2num(piece_length),
        flkey: flval,
        'name': uniconvert(name, encoding),
        'name.utf-8': uniconvert(name, 'utf-8')
    }

    if 'live' not in input:

        if input['createmerkletorrent']:
            merkletree = MerkleTree(piece_length, totalsize, None, pieces)
            root_hash = merkletree.get_root_hash()
            infodict.update({'root hash': root_hash})
        else:
            infodict.update({'pieces': ''.join(pieces)})
    else:
        # With source auth, live is a dict
        infodict['live'] = input['live']

    if 'cs_keys' in input:
        # This is a closed swarm - add torrent keys
        infodict['cs_keys'] = input['cs_keys']

    if len(subs) == 1:
        # Find and add playtime
        for file in input['files']:
Esempio n. 4
0
class TestMerkleMessage(TestAsServer):
    """ 
    Testing Merkle hashpiece messages for both:
    * Merkle BEP style
    * old Tribler <= 4.5.2 that did not use the Extention protocol (BEP 10).
     
    See BitTornado/BT1/Connecter.py
    """

    def setUp(self):
        """ override TestAsServer """
        TestAsServer.setUp(self)
        print >>sys.stderr,"test: Giving Session time to startup"
        time.sleep(5)
        print >>sys.stderr,"test: Session should have started up"

    def setUpPreSession(self):
        """ override TestAsServer """
        TestAsServer.setUpPreSession(self)
        self.config.set_overlay(False)
        self.config.set_megacache(False)

    
    def setUpPostSession(self):
        """ override TestAsServer """
        TestAsServer.setUpPostSession(self)

        # Let Tribler start downloading an non-functioning torrent, so
        # we can talk to a normal download engine.
        self.tdef = TorrentDef()
        self.sourcefn = os.path.join(os.getcwd(),"API","file2.wmv")
        self.tdef.add_content(self.sourcefn)
        self.tdef.set_create_merkle_torrent(True)
        self.tdef.set_tracker("http://127.0.0.1:12/announce")
        self.tdef.finalize()

        self.torrentfn = os.path.join(self.session.get_state_dir(),"gen.torrent")
        self.tdef.save(self.torrentfn)
        
        dscfg = self.setUpDownloadConfig()
        
        self.session.start_download(self.tdef,dscfg)

        self.infohash = self.tdef.get_infohash()
        self.mylistenport = 4810
        
        self.numpieces = (self.tdef.get_length()+self.tdef.get_piece_length()-1) / self.tdef.get_piece_length()
        b = Bitfield(self.numpieces)
        for i in range(self.numpieces):
            b[i] = True
        self.assert_(b.complete())
        self.seederbitfieldstr = b.tostring()

        #piece_hashes = ['\x01\x02\x03\x04\x05\x06\x07\x08\x07\x06\x05\x04\x03\x02\x01\x00\x01\x02\x03\x04' ] * npieces
        # Construct Merkle tree
        tdef2 = TorrentDef()
        tdef2.add_content(self.sourcefn)
        tdef2.set_create_merkle_torrent(False)
        tdef2.set_tracker("http://127.0.0.1:12/announce")
        tdef2.set_piece_length(self.tdef.get_piece_length())
        tdef2.finalize()
        metainfo = tdef2.get_metainfo()
        
        piecesstr = metainfo['info']['pieces']
        print >>sys.stderr,"test: pieces has len",len(piecesstr)
        piece_hashes = []
        for i in range(0,len(piecesstr),20):
            hash = piecesstr[i:i+20]
            print >>sys.stderr,"test: piece",i/20,"hash",`hash`
            piece_hashes.append(hash)
            
        print >>sys.stderr,"test: Putting",len(piece_hashes),"into MerkleTree, size",self.tdef.get_piece_length(),tdef2.get_piece_length()
        
        self.tree = MerkleTree(self.tdef.get_piece_length(),self.tdef.get_length(),None,piece_hashes)
        
        
        f = open(self.sourcefn,"rb")
        piece1 = f.read(2 ** 18)
        piece2 = f.read(2 ** 18)
        print >>sys.stderr,"read piece1",len(piece1)
        print >>sys.stderr,"read piece2",len(piece2)
        f.close()
        hash1 = sha(piece1).digest()
        hash2 = sha(piece2).digest()
        print >>sys.stderr,"hash piece1",`hash1`
        print >>sys.stderr,"hash piece2",`hash2`
        f2 = open("piece1.bin","wb")
        f2.write(piece2)
        f2.close()
        

    def setUpDownloadConfig(self):
        dscfg = DownloadStartupConfig()
        print >>sys.stderr,"test: Downloading to",self.config_path
        dscfg.set_dest_dir(self.config_path)
        dscfg.set_breakup_seed_bitfield(False)
        
        return dscfg        
        
    def tearDown(self):
        TestAsServer.tearDown(self)
        try:
            os.remove('piece1.bin')
        except:
            pass

        
    def singtest_good_hashpiece_bepstyle(self):
        self.subtest_good_hashpiece(False)

    def singtest_good_hashpiece_oldstyle(self):
        self.subtest_good_hashpiece(True)

    def singtest_good_request_bepstyle(self):
        # Let Session download file first
        self.subtest_good_hashpiece(False)
        # Now connect as different peer and download
        print >>sys.stderr,"\n\ntest: test_good_request: STARTING"
        self._test_good_request()

    def singtest_bad_hashpiece_bepstyle(self):
        self.subtest_bad_hashpiece(False)

    def singtest_bad_hashpiece_oldstyle(self):
        self.subtest_bad_hashpiece(True)

    #
    # Good hashpiece message
    #
    def subtest_good_hashpiece(self,oldstyle):
        print >>sys.stderr,"test: Testing good hashpiece, oldstyle",oldstyle
        if oldstyle:
            self._test_good(self.create_good_hashpiece,oldstyle,self.create_good_tribler_extend_hs,infohash=self.infohash)
        else:
            options = '\x00\x00\x00\x00\x00\x10\x00\x00'
            self._test_good(self.create_good_hashpiece,oldstyle,self.create_good_nontribler_extend_hs,options=options,infohash=self.infohash)

    def _test_good(self,msg_gen_func,oldstyle,extend_hs_gen_func,options=None,infohash=None):
        if options is None and infohash is None:
            s = BTConnection('localhost',self.hisport)
        elif options is None:
            s = BTConnection('localhost',self.hisport,user_infohash=infohash)
        elif infohash is None:
            s = BTConnection('localhost',self.hisport,user_option_pattern=options)
        else:
            s = BTConnection('localhost',self.hisport,user_option_pattern=options,user_infohash=infohash)
        print >>sys.stderr,"test: test_good: Create EXTEND HS"
        msg = extend_hs_gen_func()
        print >>sys.stderr,"test: test_good: Sending EXTEND HS",`msg`
        s.send(msg)
        print >>sys.stderr,"test: test_good: Waiting for BT HS"
        s.read_handshake_medium_rare()

        # Tribler should send an EXTEND message back
        try:
            print >>sys.stderr,"test: Waiting for reply"
            s.s.settimeout(10.0)
            resp = s.recv()
            self.assert_(len(resp) > 0)
            print >>sys.stderr,"test: Got reply",getMessageName(resp[0])
            self.assert_(resp[0] == EXTEND)
            self.check_tribler_extend_hs(resp[1:])
            
            # 1. Pretend we're seeder: send BITFIELD and UNCHOKE
            msg = BITFIELD+self.seederbitfieldstr
            s.send(msg)
            msg = UNCHOKE
            s.send(msg)
            print >>sys.stderr,"test: Pretend we are seeder"
            while True:
                resp = s.recv()
                self.assert_(len(resp) > 0)
                print >>sys.stderr,"test: Got reply2",getMessageName(resp[0])
                self.assert_(resp[0] == REQUEST or resp[0] == INTERESTED or resp[0] == UNCHOKE or resp[0] == HAVE or resp[0] == NOT_INTERESTED)
                if resp[0] == REQUEST:
                    chunkid = self.check_request(resp)
            
                    # 2. Reply to REQUEST with HASHPIECE (oldstyle) or Tr_hashpiece
                    msg = msg_gen_func(oldstyle,chunkid)
                    s.send(msg)
                elif resp[0] == NOT_INTERESTED:
                    break
            
            #s.close()
        except socket.timeout:
            print >> sys.stderr,"test: Timeout, bad, peer didn't reply in time"
            self.assert_(False)
        
        destfn = os.path.join(self.config_path,"file2.wmv")
        sf = open(self.sourcefn,"rb")
        df = open(destfn,"rb")
        n = self.tdef.get_piece_length()
        while True:
            sdata = sf.read(n)
            if len(sdata) == 0:
                break
            ddata = df.read(n)
            self.assert_(sdata == ddata)

        time.sleep(3)
        s.close()

    def create_good_nontribler_extend_hs(self):
        """ Merkle BEP style """
        d = {}
        d['m'] = {'Tr_hashpiece':250}
        d['p'] = self.mylistenport
        d['v'] = 'TestSweet 1.2.3.4'
        bd = bencode(d)
        return EXTEND+chr(0)+bd

    def create_good_tribler_extend_hs(self):
        """ old Tribler style """
        d = {}
        d['m'] = {'Tr_OVERLAYSWARM':253}
        d['p'] = self.mylistenport
        d['v'] = 'Tribler 3.5.1'
        bd = bencode(d)
        return EXTEND+chr(0)+bd


    def check_tribler_extend_hs(self,data):
        self.assert_(data[0] == chr(0))
        d = bdecode(data[1:])
        self.assert_(type(d) == DictType)
        self.assert_('m' in d.keys())
        m = d['m']
        self.assert_(type(m) == DictType)
        self.assert_('Tr_hashpiece' in m.keys())
        val = m['Tr_hashpiece']
        self.assert_(type(val) == IntType)
        self.assert_(val == 250)

    def check_request(self,data):
        index = toint(data[1:5])
        begin = toint(data[5:9])
        length = toint(data[9:])
        return (index,begin,length)

    def create_good_hashpiece(self,oldstyle,chunkid):
        index, begin, length = chunkid
        if begin == 0:
            ohlist = self.tree.get_hashes_for_piece(index)
        else:
            ohlist = []

        chunk = self.read_chunk(index,begin,length)
        bohlist = bencode(ohlist)
        
        print >>sys.stderr,"test: create_good_hashpiece:",index,begin,length,"==len",len(chunk)

        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        if oldstyle:
            msg = HASHPIECE+payload
        else:
            # Offical: use the msg ID he defined in his handshake
            msg = EXTEND+HASHPIECE+payload
        return msg

    def read_chunk(self,index,begin,length):
        offset = index*self.tdef.get_piece_length() + begin
        f = open(self.sourcefn,"rb")
        f.seek(offset)
        chunk = f.read(length)
        f.close()
        return chunk



    #
    # Test whether Tribler sends good Tr_hashpiece on our requests
    #
    def _test_good_request(self):
        options = '\x00\x00\x00\x00\x00\x10\x00\x00'
        myid = Rand.rand_bytes(20)
         
        s = BTConnection('localhost',self.hisport,user_option_pattern=options,user_infohash=self.infohash,myid=myid)
        msg = self.create_good_nontribler_extend_hs()
        s.send(msg)
        s.read_handshake_medium_rare()

        # Tribler should send an EXTEND message back
        try:
            print >>sys.stderr,"test: Waiting for reply"
            s.s.settimeout(10.0)
            resp = s.recv()
            self.assert_(len(resp) > 0)
            print >>sys.stderr,"test: Got reply",getMessageName(resp[0])
            self.assert_(resp[0] == EXTEND)
            self.check_tribler_extend_hs(resp[1:])
            
            # 1. Pretend we're leecher: send INTERESTED
            msg = INTERESTED
            s.send(msg)
            print >>sys.stderr,"test: Pretend we are leecher"
            while True:
                resp = s.recv()
                self.assert_(len(resp) > 0)
                print >>sys.stderr,"test: Got reply2",getMessageName(resp[0])
                if resp[0] == EXTEND:
                    print >>sys.stderr,"test: Got EXTEND type",getMessageName(resp[1])
                self.assert_(resp[0] == UNCHOKE or resp[0] == BITFIELD or resp[0] == EXTEND or resp[0] == HAVE)
                if resp[0] == UNCHOKE:
                    # 2. Reply with REQUESTs
                    for index in range(0,self.numpieces):
                        plen = self.get_piece_length(index)
                            
                        for begin in range(0,plen,2 ** 14):
                            length = self.get_chunk_length(index,begin)
                            print >>sys.stderr,"RETRIEVE",index,begin,length
                            chunkid = (index,begin,length)
                            msg = self.create_request(chunkid)
                            s.send(msg)
                            
                    #s.send(NOT_INTERESTED)
                        
                elif resp[0] == EXTEND and resp[1] == HASHPIECE:
                    done = self.check_hashpiece(resp)
                    if done:
                        break
                elif resp[0] == BITFIELD:
                    self.check_bitfield(resp)
            
            #s.close()
        except socket.timeout:
            print >> sys.stderr,"test: Timeout, bad, peer didn't reply in time"
            self.assert_(False)

        time.sleep(3)
        s.close()


    def get_piece_length(self,index):
        if index == (self.numpieces-1):
            plen = self.tdef.get_length() % self.tdef.get_piece_length()
        else:
            plen = self.tdef.get_piece_length()
        return plen
    
    def get_chunk_length(self,index,begin):
        plen = self.get_piece_length(index)
        length = 2 ** 14
        if index == (self.numpieces-1):
            if (begin+2 ** 14) > plen:
                length = plen - begin
        return length
                
        
    def create_request(self,chunkid):
        index,begin,length = chunkid
        return REQUEST+tobinary(index)+tobinary(begin)+tobinary(length)


    def check_hashpiece(self,resp):
        """ Merkle BEP style """
        print >>sys.stderr,"test: good_request: check_hashpiece"
        self.assert_(resp[0] == EXTEND)
        self.assert_(resp[1] == HASHPIECE)
        index = toint(resp[2:2+4])
        begin = toint(resp[6:6+4])
        ohlen = toint(resp[10:10+4])
        print >>sys.stderr,"test: good_request: check_hashpiece",index,begin,ohlen
        bohlist = resp[14:14+ohlen]
        hisohlist = bdecode(bohlist)
        hischunk = resp[14+ohlen:]
        
        if begin == 0:
            self.assert_(type(hisohlist) == ListType)
            for oh in hisohlist:
                self.assert_(type(oh) == ListType)
                self.assert_(len(oh) == 2)
                self.assert_(type(oh[0]) == IntType)
                self.assert_(type(oh[1]) == StringType)
            
            hisohlist.sort()
            print >>sys.stderr,"test: good_request: check_hashpiece",`hisohlist`
            myohlist = self.tree.get_hashes_for_piece(index)
            myohlist.sort()
            
            self.assert_(len(hisohlist) == len(myohlist))
            for i in range(0,len(hisohlist)):
                hisoh = hisohlist[i]
                myoh = myohlist[i]
                self.assert_(hisoh == myoh)
        else:
            self.assert_(len(hisohlist) == 0)
        
        mylength = self.get_chunk_length(index,begin)
        mychunk = self.read_chunk(index,begin,mylength)
        
        self.assert_(hischunk == mychunk)

        return index == self.numpieces-1 and mylength != 2 ** 14

    def check_bitfield(self,data):
        self.assert_(data[0] == BITFIELD)
        bitmap = data[1:]
        self.assert_(len(bitmap) == 1)
        # Must have set_breakup_seed_bitfield() set to False
        self.assert_(bitmap == '\xc0')


    #
    # Bad EXTEND handshake message
    #    
    def subtest_bad_hashpiece(self,oldstyle):
        if not oldstyle:
            # Test becomes equivalent to BT keep alive message (len 0, payload '')
            self._test_bad(self.create_empty,oldstyle)
        self._test_bad(self.create_ext_id_not_byte,oldstyle)
        self._test_bad(self.create_not_hashpiece,oldstyle)
        self._test_bad(self.create_not_index,oldstyle)
        self._test_bad(self.create_not_begin,oldstyle)
        self._test_bad(self.create_not_len_bohlist,oldstyle)
        self._test_bad(self.create_ohlist_not_bdecodable,oldstyle)
        self._test_bad(self.create_ohlist_wrong_no_hashes,oldstyle)
        self._test_bad(self.create_ohlist_wrong_no_root_hash,oldstyle)
        self._test_bad(self.create_ohlist_wrong_bad_offset,oldstyle)
        self._test_bad(self.create_ohlist_wrong_bad_hash,oldstyle)
        # TODO: need working peer kicking for that
        ##self._test_bad(self.create_bad_chunk,oldstyle)
    
    #
    # Main test code for bad EXTEND handshake messages
    #
    def _test_bad(self,msg_gen_func,oldstyle):
        print >>sys.stderr,"test: test_BAD: Create EXTEND HS",`msg_gen_func`,oldstyle
        if oldstyle:
            options = None
            exthsmsg = self.create_good_tribler_extend_hs()
        else:
            options = '\x00\x00\x00\x00\x00\x10\x00\x00'
            exthsmsg = self.create_good_nontribler_extend_hs()
        
        
        s = BTConnection('localhost',self.hisport,user_option_pattern=options,user_infohash=self.infohash)
        s.send(exthsmsg)
        s.read_handshake_medium_rare()

        # Tribler should send an EXTEND message back
        try:
            print >>sys.stderr,"test: Waiting for reply"
            s.s.settimeout(10.0)
            resp = s.recv()
            self.assert_(len(resp) > 0)
            print >>sys.stderr,"test: Got reply",getMessageName(resp[0])
            self.assert_(resp[0] == EXTEND)
            self.check_tribler_extend_hs(resp[1:])
            
            # 1. Pretend we're seeder: send BITFIELD and UNCHOKE
            msg = BITFIELD+self.seederbitfieldstr
            s.send(msg)
            msg = UNCHOKE
            s.send(msg)
            print >>sys.stderr,"test: Pretend we are seeder"
            while True:
                resp = s.recv()
                self.assert_(len(resp) > 0)
                print >>sys.stderr,"test: Got reply 2",getMessageName(resp[0])
                self.assert_(resp[0] == REQUEST or resp[0] == INTERESTED or resp[0] == UNCHOKE or resp[0] == HAVE or resp[0] == NOT_INTERESTED)
                if resp[0] == REQUEST:
                    chunkid = self.check_request(resp)
            
                    # 2. Reply to REQUEST with *bad* HASHPIECE
                    msg = msg_gen_func(chunkid)
                    if oldstyle:
                        if len(msg) == 1:
                            msg = ''
                        else:
                            msg = msg[1:] # Strip EXTEND byte
                    s.send(msg)
                    break
                    
            
            #s.close()
        except socket.timeout:
            print >> sys.stderr,"test: Timeout, bad, peer didn't reply in time"
            self.assert_(False)


        time.sleep(3)
        # Should have closed the connection
        try:
            s.send(UNCHOKE)
            self.assert_(False)
        except:
            print_exc()

        s.close()
            

    #
    # Bad message creators (all create Merkle BEP style, I strip first byte
    # later for oldstyle
    # 
    def create_empty(self,chunkid):
        return EXTEND

    def create_ext_id_not_byte(self,chunkid):
        return EXTEND+'Hallo kijkbuiskinderen'

    def create_not_hashpiece(self,chunkid):
        index,begin,length = chunkid
        ohlist = []
        bohlist = bencode(ohlist)
        chunk = self.read_chunk(index,begin,length)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+chr(231)+payload

    def create_not_index(self,chunkid):
        payload = 'bla'
        return EXTEND+HASHPIECE+payload

    def create_not_begin(self,chunkid):
        index,begin,length = chunkid
        payload = tobinary(index)+'bla'
        return EXTEND+HASHPIECE+payload

    def create_not_len_bohlist(self,chunkid):
        index,begin,length = chunkid
        payload = tobinary(index)+tobinary(begin)+'bla'
        return EXTEND+HASHPIECE+payload

    def create_ohlist_not_bdecodable(self,chunkid):
        index,begin,length = chunkid
        bohlist = 'bla'
        chunk = '*' * (2 ** 14)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload

    def create_ohlist_wrong_no_hashes(self,chunkid):
        index,begin,length = chunkid
        ohlist = [ (0,'#' * 20),(1,'$' * 20)]  # should contain 3 for file2.wmv: own, sibling and root
        bohlist = bencode(ohlist)
        chunk = '*' * (2 ** 14)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload

    def create_ohlist_wrong_no_root_hash(self,chunkid):
        index,begin,length = chunkid
        ohlist = self.tree.get_hashes_for_piece(index)
        newohlist = []
        # Remove root hash
        for oh in ohlist:
            if oh[0] != 0:
                newohlist.append(oh)
        ohlist = newohlist
        bohlist = bencode(ohlist)
        chunk = self.read_chunk(index,begin,length)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload


    def create_ohlist_wrong_bad_offset(self,chunkid):
        index,begin,length = chunkid
        ohlist = self.tree.get_hashes_for_piece(index)
        ohlist[1][0] = 481
        bohlist = bencode(ohlist)
        chunk = self.read_chunk(index,begin,length)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload

    def create_ohlist_wrong_bad_hash(self,chunkid):
        index,begin,length = chunkid
        ohlist = self.tree.get_hashes_for_piece(index)
        ohlist[1][1] = '$' * 20
        bohlist = bencode(ohlist)
        chunk = self.read_chunk(index,begin,length)
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload

    def create_bad_chunk(self,chunkid):
        index,begin,length = chunkid
        ohlist = self.tree.get_hashes_for_piece(index)
        bohlist = bencode(ohlist)
        chunk = '*' * length
        payload = tobinary(index)+tobinary(begin)+tobinary(len(bohlist))+bohlist+chunk
        return EXTEND+HASHPIECE+payload