#include <stdio.
h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include<unistd.h>
int main()
{
int socket_desc, client_sock, client_size,frame;
struct sockaddr_in server_addr, client_addr;
char server_message[2000], client_message[2000];
// Clean buffers:
memset(server_message, '\0', sizeof(server_message));
memset(client_message, '\0', sizeof(client_message));
// Create socket:
socket_desc = socket(AF_INET, SOCK_STREAM, 0);
if(socket_desc < 0){
printf("Error while creating socket\n");
return -1;
}
printf("Socket created successfully\n");
// Set port and IP:
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(8080);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
// Bind to the set port and IP:
if(bind(socket_desc, (struct sockaddr*)&server_addr, sizeof(server_addr))<0){
printf("Couldn't bind to the port\n");
return -1;
}
printf("Done with binding\n");
// Listen for clients:
if(listen(socket_desc, 1) < 0){
printf("Error while listening\n");
return -1;
}
printf("\nListening for incoming connections.....\n");
// Accept an incoming connection:
client_size = sizeof(client_addr);
client_sock = accept(socket_desc, (struct sockaddr*)&client_addr, &client_size);
if (client_sock < 0){
printf("Can't accept\n");
return -1;
}
printf("Client connected at IP: %s and port: %i\n", inet_ntoa(client_addr.sin_addr),
ntohs(client_addr.sin_port));
while(1){
// Receive client's message:
if (recv(client_sock, client_message, sizeof(client_message), 0) <0){
printf("Couldn't receive\n");
return -1;
}
printf("Msg from client: %s\n", client_message);
// Respond to client:
memset(server_message, '\0', sizeof(server_message));
memset(client_message, '\0', sizeof(client_message));
printf("\nServer Acknowledges or not:? Ack-Y or y, NACK- N or n");
z:
memset(server_message, '\0', sizeof(server_message));
scanf("%s",server_message);
//strcpy(server_message, "received");
if (send(client_sock, server_message, strlen(server_message), 0) < 0){
printf("Can't send\n");
return -1;
}
if(strcmp(server_message,"N")==0 || strcmp(server_message,"n")==0){
printf("Acknowledgement not received by client");
goto z;
}
}
// Closing the socket:
close(client_sock);
close(socket_desc);
return 0;
}
client
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include<unistd.h>
int main(void)
{
int socket_desc;
int timer,frame;
struct sockaddr_in server_addr;
char server_message[2000], client_message[2000];
// Clean buffers:
memset(server_message,'\0',sizeof(server_message));
memset(client_message,'\0',sizeof(client_message));
// Create socket:
socket_desc = socket(AF_INET, SOCK_STREAM, 0);
if(socket_desc < 0){
printf("Unable to create socket\n");
return -1;
}
printf("Socket created successfully\n");
// Set port and IP the same as server-side:
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(8080);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
// Send connection request to server:
if(connect(socket_desc, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0){
printf("Unable to connect\n");
return -1;
}
printf("Connected with server successfully\n");
printf("Enter the total frames: ");
scanf("%d",&frame);
while(frame>0){
// Get input from the user:
memset(server_message,'\0',sizeof(server_message));
memset(client_message,'\0',sizeof(client_message));
printf("\nEnter frame message: ");
scanf("%s",client_message);
// Send the message to server:
x:
timer = 10;
if(send(socket_desc, client_message, strlen(client_message), 0) < 0){
printf("Unable to send message\n");
return -1;
}
// Receive the server's response:
y:
if(timer>0){
if(recv(socket_desc, server_message, sizeof(server_message), 0) < 0){
printf("Error while receiving server's msg\n");
timer--;
goto y;
}
if(strcmp(server_message,"N")==0 || strcmp(server_message,"n")==0){
printf("\nWaiting...");
timer--;
goto y;
}
if(strcmp(server_message,"Y")==0 || strcmp(server_message,"y")==0){
printf("\nServer acknowledged");
timer =0;
frame--;
}// Close the socket:
}
else{
printf("\nServer donot acknowledged\nResending....");
goto x;
}
}
close(socket_desc);
return 0;
}
OUTPUT
buntu@ubuntu-H81M-S:~$ gcc slse.c
ubuntu@ubuntu-H81M-S:~$ gcc slse.c -o Server
ubuntu@ubuntu-H81M-S:~$ ./Server
Socket created successfully
Done with binding
Listening for incoming connections.....
Client connected at IP: 127.0.0.1 and port: 44584
Msg from client: i
Server Acknowledges or not:? Ack-Y or y, NACK- N or ny
Msg from client: A
Server Acknowledges or not:? Ack-Y or y, NACK- N or nY
Msg from client: Y
Server Acknowledges or not:? Ack-Y or y, NACK- N or nY
Msg from client: K
Server Acknowledges or not:? Ack-Y or y, NACK- N or nN
ubuntu@ubuntu-H81M-S:~$
CLIENT
ubuntu@ubuntu-H81M-S:~$ gcc slcl.c
ubuntu@ubuntu-H81M-S:~$ gcc slcl.c -o Client
ubuntu@ubuntu-H81M-S:~$ ./Client
Socket created successfully
Connected with server successfully
Enter the total frames: 4
Enter frame message: i
Server acknowledged
Enter frame message: A
Server acknowledged
Enter frame message: Y
Server acknowledged
Enter frame message: K
Server acknowledged
