/**
* @file
* @author [Nairit11](https://github.com/Nairit11)
* @author [Krishna Vedala](https://github.com/kvedala)
* @brief Server side implementation of Server-Client system.
* @see client_server/client.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// #ifdef HAS_UNISTD
// #include <unistd.h>
// #endif
#ifdef _WIN32
#define _WINSOCK_DEPRECATED_NO_WARNINGS // will make the code invalid for next
// MSVC compiler versions
#include <winsock2.h>
#define bzero(b, len) \
(memset((b), '\0', (len)), (void)0) /**< BSD name not in windows */
#define read(a, b, c) recv(a, b, c, 0) /**< map BSD name to Winsock */
#define write(a, b, c) send(a, b, c, 0) /**< map BSD name to Winsock */
#define close closesocket /**< map BSD name to Winsock */
#else
// if not windows platform
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>
#endif
#define MAX 80 /**< max. characters per message */
#define PORT 8080 /**< port number to connect to */
#define SA struct sockaddr /**< shortname for sockaddr */
#ifdef _WIN32
/** Cleanup function will be automatically called on program exit */
void cleanup() { WSACleanup(); }
#endif
/**
* Continuous loop to send and receive over the socket.
* Exits when "exit" is sent from commandline.
* @param sockfd socket handle number
*/
void func(int sockfd)
{
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;
}
}
}
/** Driver code */
int main()
{
#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;
}