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
import layer2 import layer3 import layer4 import layer5 import netUtils import performHandshake source_ip=netUtils.get_source_ip() source_mac=netUtils.get_source_mac() source_port=netUtils.getFreePort() host,path=netUtils.serverNameExtract(sys.argv[1]) destination_ip=socket.gethostbyname(host) #print(dest_ip) #129.10.116.81 dest_port=80 def handshake(source_ip,dest_ip,source_port): client_seq,client_ack=performHandshake.sendSyn(source_ip,dest_ip,source_port) print("syn packet sent") tcph = performHandshake.recPacket(dest_ip) server_seq=0 server_ack=tcph[3] print (str(client_seq)+ " is our generated seq No.") print(str(server_ack)+ " is ackNo given by server")