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Chapter 14

Chapter 14. Application Layer and Client-Server Model. Figure 14-1. Client-Server Model. Figure 14-3. Concurrencia. Type of Running in Clientes Iteratively: one-by-one Concurrently: at the same time Concurrency in Services:

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Chapter 14

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  1. Chapter 14 Application Layer and Client-Server Model

  2. Figure 14-1

  3. Client-Server Model

  4. Figure 14-3

  5. Concurrencia • Type of Running in Clientes • Iteratively: one-by-one • Concurrently: at the same time • Concurrency in Services: • Conectionless Iterative Server: from the same cliente of from different clients (i.e. UDP) • Conection-Oriented Concurrent Server: serves many clients at the same time.

  6. Conectionless Iterative Server

  7. Conection-Oriented Concurrent Server

  8. Procesos • Concepto • Identificación • Creación

  9. Identificación

  10. Figure 14-10

  11. Creación

  12. Figure 14-12

  13. Figure 14-13

  14. Figure 14-14

  15. Figure 14-15

  16. Figure 14-16

  17. Chapter 24 SocketInterface

  18. Socket Types

  19. Conectionless Iterative Server

  20. Conection-Oriented Concurren Server

  21. Figure 24-26 (repeated), Part I

  22. Figure 24-26 (repeated), Part II

  23. Figure 24-27, Part I

  24. Figure 24-27, Part II

  25. Sending a message Receiving a message s = socket(AF_INET, SOCK_DGRAM, 0) s = socket(AF_INET, SOCK_DGRAM, 0) bind(s, ClientAddress) bind(s, ServerAddress) sendto(s, "message", ServerAddress) amount = recvfrom(s, buffer, from) ServerAddress and ClientAddress are socket addresses Sockets used for datagrams

  26. Sockets used for streams Requesting a connection Listening and accepting a connection s = socket(AF_INET, SOCK_STREAM,0) s = socket(AF_INET, SOCK_STREAM,0) bind(s, ServerAddress); listen(s,5); connect(s, ServerAddress) sNew = accept(s, ClientAddress); write(s, "message", length) n = read(sNew, buffer, amount) ServerAddress and ClientAddress are socket addresses

  27. #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <netinet/in.h> #include <stdio.h> #include <string.h> #define MAXBUF 256 #define PORT 2000 void main(void) { char buf[MAXBUF]; int activeSocket; int remoteAddrLen; struct sockaddr_in remoteAddr; struct sockaddr_in localAddr; struct hostent *hptr;

  28. activeSocket = socket(AF_INET, SOCK_DGRAM, 0); memset(&remoteAddr, 0,sizeof(remoteAddr)); remoteAddr.sin_family =AF_INET; remoteAddr.sin_port=htons(PORT); hptr=gethostbyname("a-domain-name"); memcpy((char*)&remoteAddr.sin_addr.s_addr,hptr->h_addr_list[0],hptr->h_length); connect(activeSocket, &remoteAddr, sizeof(remoteAddr)); memset(buf, 0, MAXBUF); remoteAddrLen = sizeof(remoteAddr); while { sendto(activeSocket, buf, sizeof(buf), 0, &remoteAddr,sizeof(remoteAddr$ memset(buf, 0, sizof(buf)); recvfrom(activeSocket, buf, MAXBUF, 0, &remoteAddr,&remoteAddrLen); printf("%s\n", buf); memset(buf, 0, sizeof(buf)); }; close(activeSocket); }

  29. Anexo

  30. Socket System Calls

  31. Figure 24-18

  32. Figure 24-21

  33. Data types

  34. Internal Sockets Address Structure

  35. Sockets Structure

  36. Byte Ordering

  37. Figure 24-8

  38. Order Translation

  39. Byte Manipulation functions

  40. Information About Remote Host

  41. Figure 24-14

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