def pageRequest(url,source_ip,destination_ip,client_seq,client_ack,server_seq,server_ack):
host,path=netUtils.serverNameExtract(sys.argv[1])
data_req=layer5.reqGenGet(host,path)
print(data_req)
tcp_header = layer4.packTCPHeader(source_ip,destination_ip, source_port, client_seq, client_ack,'PSHACK',data_req)
ip_header = layer3.packHeader(source_ip,destination_ip)
pck = ip_header + tcp_header + data_req
soc = socks.createSendSock()
recsock=socks.createRecvSock()
soc.sendto(pck,(destination_ip,80))
raw=socks.recv(recsock)
ihl,tcph,src_ip,dest_ip,iph,data,payLength = netUtils.xtractPacket(raw)
soc.close()
recsock.close
#socks.debugPrintSeqNo(client_seq,client_ack,server_seq,server_ack)
[server_seq2,server_ack2]=layer4.getServerSeqNo(tcph)
k=len(data_req)+client_seq
#print("k="+str(k))
#socks.debugPrintSeqNo(client_seq,client_ack,server_seq2,server_ack2)
if tcph[5]==0x010 and tcph[1]==source_port and server_ack2==k and server_seq2==server_seq:
print("ACK packet recieved for get. handshake done")
#body=downloadPage(tcph,iph,source_ip,destination_ip,client_seq,client_ack)
data=socks.recData(destination_ip,source_ip,source_port,client_seq,client_ack,server_seq2,server_ack2)
header_data,body=layer5.xtractHeaders(data)
#print(header_data)
else:
sys.exit("NO ack recieved for GET.pLease try later")
return body
def sendFinAck(source_ip,destination_ip, source_port,seqNo,ackNo): soc = socks.createSendSock() ip_header = layer3.packHeader(source_ip,destination_ip) tcp_header = layer4.packTCPHeader(source_ip,destination_ip, source_port, seqNo, ackNo,'FINACK','') pck = ip_header + tcp_header soc.sendto(pck,(destination_ip,80)) #print "Ack packet sent" #msg=socks.recv(soc) soc.close()
def sendSyn(source_ip,destination_ip, source_port): soc = socks.createSendSock() ip_header = layer3.packHeader(source_ip,destination_ip) seq = randint(0,42949) ack =0 tcp_header = layer4.packTCPHeader(source_ip,destination_ip, source_port, seq, ack,'SYN','') pck = ip_header + tcp_header soc.sendto(pck,(destination_ip,80)) #print "SYN packet sent with seq:"+str(seq) #msg=socks.recv(soc) soc.close() return [seq,ack]