Client.c – sum of numbers

Server.c – iterative - sum of numbers

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <string.h>

#include <unistd.h>

#include <arpa/inet.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);

}

// ServerSuma-Iterativ.cpp : Defines the entry point for the console application.

#define _WINSOCK_DEPRECATED_NO_WARNINGS 1

// exists on all platforms

#include <stdio.h>

// this section will only be compiled on NON Windows platforms

#ifndef _WIN32

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <string.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <errno.h>

#define closesocket close

typedef int SOCKET;

#else

// on Windows include and link these things

#include<WinSock2.h>

// for uint16_t an so

#include<cstdint>

// this is how we can link a library directly from the source code with the VC++ compiler – otherwise got o project settings and link to it explicitly

//#pragma comment(lib,"Ws2_32.lib")

#endif

int main() {

SOCKET s;

struct sockaddr_in server, client;

int c, l, err;

// initialize the Windows Sockets LIbrary only when compiled on Windows

#ifdef _WIN32

WSADATA wsaData;

if (WSAStartup(MAKEWORD(2, 2), &wsaData) < 0) {

printf("Error initializing the Windows Sockets LIbrary");

return -1;

}

#endif

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) {

perror("Bind error:");

return 1;

}

listen(s, 5);

l = sizeof(client);

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

while (1) {

uint16_t a, b, suma;

printf("Listening for incomming connections\n");

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

err = errno;

#ifdef _WIN32

err = WSAGetLastError();

#endif

if (c < 0) {

printf("accept error: %d", err);

continue;

}

printf("Incomming connected client from: %s:%d", inet_ntoa(client.sin_addr), ntohs(client.sin_port));

// serving the connected client

int res = recv(c, (char*)&a, sizeof(a), 0);

//check we got an unsigned short value

if (res != sizeof(a)) printf("Error receiving operand\n");

res = recv(c, (char*)&b, sizeof(b), 0);

if (res != sizeof(b)) printf("Error receiving operand\n");

//decode the value to the local representation

a = ntohs(a);

b = ntohs(b);

suma = a + b;

suma = htons(suma);

res = send(c, (char*)&suma, sizeof(suma), 0);

if (res != sizeof(suma)) printf("Error sending result\n");

//on Linux closesocket does not exist but was defined above as a define to close

closesocket(c);

}

// never reached

// Release the Windows Sockets Library

#ifdef _WIN32

WSACleanup();

#endif

}