Università degli Studi di Bergamo

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Evaristo Pala
5 anni fa
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1 Università degli Studi di Bergamo Facoltà di Ingegneria Prof. Filippini

2 2!!!!!!!

3 3!!!! Applicazioni di rete Web (web server, browser, HTML) (mail server, mail client, MIME) Protocolli di rete HTTP SMTP

4 4!!! WEB FTP Mail Livello controllato dall applicazione Livelli controllati dal sistema operativo TCP/UDP

5 5!!!!!!!!!!!!

6 6!!!!

7 7!!!!!

8 8!!

9 9!!!!!

10 10!!!!!

11 11!!!!!!!!!

12 12!!!!!

13 13!!!!!!!

14 14!!!!! Hypertext Transfer Protocol -- HTTP/1.0, RFC 1945, May 1996.! Hypertext Transfer Protocol -- HTTP/1.1, RFC 2068, January 1997

15 15!!! Indica il protocollo applicativo Indica l indirizzo di rete (IP) del server Indica la pagina web richieste!

16 16! Altri oggetti : Testo HTML!!!

17 17!!!!

18 18!!!!!

19 19

20 20 GET HEAD POST PUT!!

21 21

22 Continue: Prima parte della richiesta accettata. 200 OK: La richiesta ha avuto successo; l informazione è inclusa 301 Moved Permanently: L oggetto è stato spostato nell URL indicato 302 Found (Moved Temporarily): L oggetto è stato spostato nell URL indicato 400 Bad Request: Errore generico 401 Unauthorized: Accesso senza necessari account e passwd 404 Not Found: oggetto non esiste sul server 500 Internal server error Errore o guasto nel server 501 Not implemented Funzione non implementata 503 Service unavailable Servizio non disponibile

23 23!!! Cache-control Accept Accept-language Authorization If-modified-since User-agent Informazione sulla cache Formati accettati Linguaggio accettato Mostra i permessi del client Invia il doc. solo se modificato Tipo di user agent

24! GET /ntw/index.html HTTP/1.1 Connection: close User-agent: Mozilla/4.0 Accept: text/html, image/gif, image/jpeg Accept-language:it! HTTP/1.1 200 OK Connection: close Date: Thu, 06 Aug 1998 12:00:15 GMT Server: Apache/1.

24 24! GET /ntw/index.html HTTP/1.1 Connection: close User-agent: Mozilla/4.0 Accept: text/html, image/gif, image/jpeg Accept-language:it! HTTP/ OK Connection: close Date: Thu, 06 Aug :00:15 GMT Server: Apache/1.3.0 (Unix) Last-Modified: Mon, 22 Jun :23:24 GMT Content-Length: 6821 Content-Type: text/html data data data data data...

25 25!!

26 26!!!

27 27!!! GET /ntw/index.html HTTP/ Authorization Required WWW-Authenticate:[tipo di autenticazione] GET /ntw/index.html HTTP/1.1 Authorization: account, passwd. GET image.gif HTTP/1.1 Authorization: account, passwd

28 28!!! GET /ntw/index.html HTTP/ OK Set-cookie: GET /ntw/carrello/index.html HTTP/1.1 Cookie: GET image.gif HTTP/1.1 Cookie:

29 29!!!!!!!

30 30!! GET /cgi-bin/prog.pl HTTP/1.1 prog.pl 200 OK Pagina dinamica

31 31!!! GET /java/applet HTTP/ OK programma

32 32!!

33 33!!!!!!!! J.B. Postel, "Simple Mail Transfer Protocol," RFC 821, August 1982.

34 34 S: 220 hamburger.edu C: HELO crepes.fr S: 250 Hello crepes.fr, pleased to meet you C: MAIL FROM: S: 250 Sender ok C: RCPT TO: S: 250 Recipient ok C: DATA S: 354 Enter mail, end with "." on a line by itself C: Do you like ketchup? C: How about pickles? C:. S: 250 Message accepted for delivery C: QUIT S: 221 hamburger.edu closing connection

35 35!!! From: To: Subject: Request of information <blank line> <Body>.

36 36!!! From: To: Subject: Picture of yummy crepe. MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Type: image/jpeg base64 encoded data base64 encoded data.

37 37!

38 38!

39 39! From: To: Subject: Picture of yummy crepe with commentary MIME-Version: 1.0 Content-Type: multipart/mixed; Boundary=StartOfNextPart --StartOfNextPart Dear Bob, Please find a picture of an absolutely scrumptious crepe. --StartOfNextPart Content-Transfer-Encoding: base64 Content-Type: image/jpeg base64 encoded data... --StartOfNextPart Let me know if you would like the recipe..

40 40!!!!

41 41!! user: pass:! +OK -ERR!! list: retr: dele: quit S: +OK POP3 server ready C: user bob S: +OK C: pass hungry S: +OK user successfully logged on C: list S: S: S:. C: retr 1 S: <message 1 contents> S:. C: dele 1 C: retr 2 S: <message 1 contents> S:. C: dele 2 C: quit S: +OK POP3 server signing off

42 42!!! cs.unibg.it morgana.elet.polimi.it

43 43!!!!!!!! "Domain Names - Concepts and Facilities," RFC 1034, Nov ! "Domain Names - Implementation and Specification," RFC 1035, Nov

44 44 com edu org gov mil it fr jp de... yahoo ucla columbia polimi virgilio unibg cs rett elet cs morgana morgana.elet.polimi.it!!!

45 45!!!!

46 46!!!! com edu org gov mil it fr jp de... yahoo ucla columbia polimi cs rett elet virgilio morgana

47 47!!!!!!!!!!

48 48!!!

49 49!!

50 50!!!!

51 51!!!!!!!!

52 52

53 53!!!!!

54 54!!!!!!!

55 55!!!!!

56 56!!!

57 57!!!!

58 58!!! "File Transfer Protocol, RFC 959, October 1985.

59 59!!

60 60

61 61!!!!

62 62!!!!!!!!

63 63!!!!!!!

64 64! USER username PASS password QUIT log out TYPE file type MODE transfer mode CWD change directory DELE delete file LIST list files RETR retrive file STOR store file PORT client port PASV server choose port

65 125 Data connection already open; transfer starting 200 Command OK 225 Data connection open 226 Closing data connection 227 Entering passive mode; srv. sends Ip_add.

65 Data connection already open; transfer starting 200 Command OK 225 Data connection open 226 Closing data connection 227 Entering passive mode; srv. sends Ip_add.,port 230 User login OK 331 Username OK, password required 425 Can't open data connection 426 Connection closed; tranfer aborted 452 Error writing file 500 Syntax error; unrecognized command 501 Syntax error in parameters or arguments 502 Command not implemented

66 66 USER filippini 331 username OK; password? PASS pippo user login OK PORT opening data connection LIST /usr/pub 125 data connection OK 226 closing data connection

67 67!!

68 68!!!

69 69

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