Pereche de programe client – server iterativ, implementare C sub Linux

client.c

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>

int main() {
  int c;
  struct sockaddr_in server;
  uint16_t a, b, suma;
  
  c = socket(AF_INET, SOCK_STREAM, 0);
  if (c < 0) {
    printf("Eroare la crearea socketului client\n");
    return 1;
  }
  
  memset(&server, 0, sizeof(server));
  server.sin_port = htons(1234);
  server.sin_family = AF_INET;
  server.sin_addr.s_addr = inet_addr("127.0.0.1");
  
  if (connect(c, (struct sockaddr *) &server, sizeof(server)) < 0) {
    printf("Eroare la conectarea la server\n");
    return 1;
  }
  
  printf("a = ");
  scanf("%hu", &a);
  printf("b = ");
  scanf("%hu", &b);
  a = htons(a);
  b = htons(b);
  send(c, &a, sizeof(a), 0);
  send(c, &b, sizeof(b), 0);
  recv(c, &suma, sizeof(suma), 0);
  suma = ntohs(suma);
  printf("Suma este %hu\n", suma);
  close(c);
}

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <string.h>

int main() {

int c;

struct sockaddr_in server;

uint16_t a, b, suma;

c = socket(AF_INET, SOCK_STREAM, 0);

if (c < 0) {

printf("Eroare la crearea socketului client\n");

return 1;

}

memset(&server, 0, sizeof(server));

server.sin_port = htons(1234);

server.sin_family = AF_INET;

server.sin_addr.s_addr = inet_addr("127.0.0.1");

if (connect(c, (struct sockaddr *) &server, sizeof(server)) < 0) {

printf("Eroare la conectarea la server\n");

return 1;

}

printf("a = ");

scanf("%hu", &a);

printf("b = ");

scanf("%hu", &b);

a = htons(a);

b = htons(b);

send(c, &a, sizeof(a), 0);

send(c, &b, sizeof(b), 0);

recv(c, &suma, sizeof(suma), 0);

suma = ntohs(suma);

printf("Suma este %hu\n", suma);

close(c);

}

server.c

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>

int main() {
  int s;
  struct sockaddr_in server, client;
  int c, l;
  
  s = socket(AF_INET, SOCK_STREAM, 0);
  if (s < 0) {
    printf("Eroare la crearea socketului server\n");
    return 1;
  }
  
  memset(&server, 0, sizeof(server));
  server.sin_port = htons(1234);
  server.sin_family = AF_INET;
  server.sin_addr.s_addr = INADDR_ANY;
  
  if (bind(s, (struct sockaddr *) &server, sizeof(server)) < 0) {
    printf("Eroare la bind\n");
    return 1;
  }

  listen(s, 5);
  
  l = sizeof(client);
  memset(&client, 0, sizeof(client));
  
  while (1) {
    uint16_t a, b, suma;
    c = accept(s, (struct sockaddr *) &client, &l);
    printf("S-a conectat un client.\n");
    // deservirea clientului
    recv(c, &a, sizeof(a), MSG_WAITALL);
    recv(c, &b, sizeof(b), MSG_WAITALL);
    a = ntohs(a);
    b = ntohs(b);
    suma = a + b;
    suma = htons(suma);
    send(c, &suma, sizeof(suma), 0);
    close(c);
    // sfarsitul deservirii clientului;
  }
}

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <string.h>

int main() {

int s;

struct sockaddr_in server, client;

int c, l;

s = socket(AF_INET, SOCK_STREAM, 0);

if (s < 0) {

printf("Eroare la crearea socketului server\n");

return 1;

}

memset(&server, 0, sizeof(server));

server.sin_port = htons(1234);

server.sin_family = AF_INET;

server.sin_addr.s_addr = INADDR_ANY;

if (bind(s, (struct sockaddr *) &server, sizeof(server)) < 0) {

printf("Eroare la bind\n");

return 1;

}

listen(s, 5);

l = sizeof(client);

memset(&client, 0, sizeof(client));

while (1) {

uint16_t a, b, suma;

c = accept(s, (struct sockaddr *) &client, &l);

printf("S-a conectat un client.\n");

// deservirea clientului

recv(c, &a, sizeof(a), MSG_WAITALL);

recv(c, &b, sizeof(b), MSG_WAITALL);

a = ntohs(a);

b = ntohs(b);

suma = a + b;

suma = htons(suma);

send(c, &suma, sizeof(suma), 0);

close(c);

// sfarsitul deservirii clientului;

}