server.c File Reference

Server side implementation of Server-Client system. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>

Include dependency graph for server.c:

Macros
#define	MAX   80
	max. More...
#define	PORT   8080
	port number to connect to
#define	SA   struct sockaddr
	shortname for sockaddr

Functions
void	func (int sockfd)
	Continuous loop to send and receive over the socket. More...
int	main ()
	Driver code. More...

Detailed Description

Server side implementation of Server-Client system.

Author

Nairit11

Krishna Vedala

See also

client_server/client.c

Macro Definition Documentation

MAX

#define MAX   80

max.

characters per message

Function Documentation

func()

void func

(

int

sockfd

)

Continuous loop to send and receive over the socket.

Exits when "exit" is sent from commandline.

Parameters

sockfd

socket handle number

{
    char buff[MAX];
    int n;
    // infinite loop for chat
    for (;;)
    {
        bzero(buff, MAX);
 
        // read the message from client and copy it in buffer
        read(sockfd, buff, sizeof(buff));
        // print buffer which contains the client contents
        printf("From client: %s\t To client : ", buff);
        bzero(buff, MAX);
        n = 0;
        // copy server message in the buffer
        while ((buff[n++] = getchar()) != '\n')
        {
            ;
        }
 
        // and send that buffer to client
        write(sockfd, buff, sizeof(buff));
 
        // if msg contains "Exit" then server exit and chat ended.
        if (strncmp("exit", buff, 4) == 0)
        {
            printf("Server Exit...\n");
            break;
        }
    }
}

main()

int main

(

void

)

Driver code.

{
#ifdef _WIN32
    // when using winsock2.h, startup required
    WSADATA wsData;
    if (WSAStartup(MAKEWORD(2, 2), &wsData) != 0)
    {
        perror("WSA Startup error: \n");
        return 0;
    }
 
    atexit(cleanup);  // register at-exit function
#endif
 
    int sockfd, connfd;
    unsigned int len;
    struct sockaddr_in servaddr, cli;
 
    // socket create and verification
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        perror("socket creation failed...\n");
        exit(0);
    }
    else
    {
        printf("Socket successfully created..\n");
    }
    bzero(&servaddr, sizeof(servaddr));
 
    // assign IP, PORT
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(PORT);
 
    // Binding newly created socket to given IP and verification
    if ((bind(sockfd, (SA *)&servaddr, sizeof(servaddr))) != 0)
    {
        perror("socket bind failed...\n");
        exit(0);
    }
    else
    {
        printf("Socket successfully binded..\n");
    }
 
    // Now server is ready to listen and verification
    if ((listen(sockfd, 5)) != 0)
    {
        perror("Listen failed...\n");
        exit(0);
    }
    else
    {
        printf("Server listening..\n");
    }
    len = sizeof(cli);
 
    // Accept the data packet from client and verification
    connfd = accept(sockfd, (SA *)&cli, &len);
    if (connfd < 0)
    {
        perror("server acccept failed...\n");
        exit(0);
    }
    else
    {
        printf("server acccept the client...\n");
    }
 
    // Function for chatting between client and server
    func(connfd);
 
    // After chatting close the socket
    close(sockfd);
    return 0;
}

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