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1 Lecture 5 S2 - Summary of Network Protocols Programming in JSE for Distributed Systems Section 2 presentation DAD Distributed Applications Development Cristian Toma D.I.C.E/D.E.I.C Department of Economic Informatics & Cybernetics
2 Cristian Toma Business Card
3 Agenda for Lecture 5 Networking Recap FTP Networking Recap HTTP - S2 End Exchange Ideas
4 Networking IP, FTP programming, TCP/IP programming issues Networking Recapitulation
5 1. Networking TCP/IP Stack HOW TCP/IP Works recap from previous lecture and from BSc.:
6 1. Networking TCP/IP Stack TCP/IP Stack Model recap from previous lecture and from BSc.:
7 1. Networking TCP/IP Stack ISO/OSI Model vs. TCP/IP recap from previous lecture and from BSc.:
8 1. TCP/IP Network Programming UDP Programming Socket Primitives: UDP Server socket() bind() recvfrom() sendto() close() Network Request Response UDP Client socket() - sento() recvfrom() close() Recap from previous lecture and from BSc. + Multi-threading included in samples
9 1. TCP/IP Network Programming UDP Programming Socket Primitives: Recap from previous lecture and from BSc. + Multi-threading included in samples
10 1. TCP/IP Network Programming UDP Programming Socket Primitives: Recap from previous lecture and from BSc. + Multi-threading included in samples
11 1. TCP/IP Network Programming TCP Programming Socket Primitives: TCP Server Network TCP Client socket() bind() listen() accept() - read()/recv() write()/send() close() Establishing the connection / TCP Handshake Request Response socket() connect() write()/send() read()/recv() close() Recap from previous lecture and from BSc. + Multi-threading included in samples
12 1. TCP/IP Network Programming TCP Programming Socket Primitives: Recap from previous lecture and from BSc.
13 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
14 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
15 1. TCP/IP Network Programming FTP FTP Programming RFC 959: Server.java ServerPI.java ServerDTP.java
16 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
17 1. TCP/IP Network Programming FTP FTP Programming RFC 959: In order to use active mode, the client sends a PORT command, with the IP and port as argument. The format for the IP and port is "h1,h2,h3,h4,p1,p2". Each field is a decimal representation of 8 bits of the host IP, followed by the chosen data port. For example, the client with an IP of , listening on port 5001 for the data connection will send the command "PORT 192,168,0,5,19,137". The port fields should be interpreted as p p2 = port, or, in this example, 19* = 5001 The FTP client will be TCP server in port 5001 and the FTP server became TCP client from port 20
18 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
19 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
20 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
21 1. TCP/IP Network Programming FTP FTP Programming RFC 959:
22 1. TCP/IP Network Programming FTP FTP Programming RFC 959: In passive mode, the FTP server opens a dynamic port ( ), sends the FTP client the server's IP address to connect to and the port on which it is listening (a 16 bit value broken into a high and low byte, like explained before) over the control stream and waits for a connection from the FTP client. In this case the FTP client binds the source port of the connection to a dynamic port between and To use passive mode, the client sends the PASV command to which the server would reply with something similar to "227 Entering Passive Mode (127,0,0,1,192,52)". The syntax of the IP address and port are the same as for the argument to the PORT command. HERE server port is In extended passive mode, the FTP server operates exactly the same as passive mode, however it only transmits the port number (not broken into high and low bytes) and the client is to assume that it connects to the same IP address that was originally connected to. Extended passive mode was added by RFC 2428 in September 1998.
23 Section Conclusion Fact: DAD needs Network Programming In few samples it is simple to remember: UDP and TCP programming is useful for HTC didactical samples: SNMP over UDP for monitoring, SMTP/IMAP4/POP3 over TCP for notification, FTP over TCP for file and data transfer, HTTP over TCP for web & web services, and in general TCP for RPC/RMI, CORBA, JMS, SOAP, P2P- JXTA for distributed computing and systems.
24 Networking IP, HTTP programming, TCP/IP programming issues Networking Recapitulation
25 2. TCP/IP Network Programming HTTP Programming RFC 2616:
26 2. TCP/IP Network Programming HTTP Programming RFC 2616:
27 2. TCP/IP Network Programming HTTP Programming RFC 2616:
28 2. TCP/IP Network Programming Q&A - Distributed Applications Development Section 2 Summary of Network Protocols Programming in JSE for Distributed Systems SNMP * Zabbix, Cacti, Nagios, Ganglia? SMTP java.mail.*; POP3 IMAP4 Items necessary for section 2 learning Network Protocols Programming: JAVA Source Code Lectures + Labs/Seminars Network Standards & Protocols RFCs + Lectures, Network Traffic Analyzer Wire-Shark Do we need SNMP for programming and development of distributed applications? Are useful SMTP/POP3/IMAP4 distributed applications development? Do we need FTP & HTTP? What are the advantages and disadvantages for reinventing the weel when are in the market standard software libraries and frameworks?
29 2. TCP/IP Network Programming Q&A - Distributed Applications Development Section 2 Summary of Network Protocols Programming in JSE for Distributed Systems Issues discussed during the network protocols programming: Client/Server Model Request/Response Message Passing Model the client asks info or resources and the server responds Connection oriented socket versus datagram socket reliable versus non-reliable data transfer TCP vs. UDP The messages format headers & info overload vs. payload Protocols and servers statefull vs. stateless Protocols with messages exchange in synchronous or asynchronous mode network call-back functions The security of the communications between the clients and servers is an important issue, but it is not included in this lecture because the curriculum and time resources.
30 Section Conclusions Fact: DAD needs Network Programming Network Programming for easy sharing In few samples it is simple to remember: UDP and TCP programming is useful for HTC didactical samples: SNMP over UDP for monitoring, SMTP/IMAP4/POP3 over TCP for notification, FTP over TCP for file and data transfer, HTTP over TCP for web & web services, and in general TCP for RPC/RMI, CORBA, JMS, SOAP, P2P-JXTA for distributed computing and systems.
31 Java Sockets Network Programming & Java Servlet Technology Intro Communicate & Exchange Ideas
32 ? Questions & Answers! But wait There s More!
33 What s Your Message? Thanks! DAD Distributed Application Development End of Lecture 5 Section 2
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