Explanation:

I want to send a message from telnet and do something to the server according to this message, but unexpected situations occur when comparing the message from telnet.

I want the server to be stopped when a "quit" message is sent from telnet, but when I print the incoming message to the screen, the strcmp() function does not perform its function, even though message equals "quit".

Code:

#include<stdio.h>
#include<string.h>    // for strlen
#include<sys/socket.h>
#include<arpa/inet.h> // for inet_addr
#include<unistd.h>    // for write
 
int main(int argc, char *argv[])
{
    int socket_desc , new_socket , c;
    struct sockaddr_in server , client;
    char message[1000];
    char received_message[1000];
     
    // Create socket
    socket_desc = socket(AF_INET, SOCK_STREAM, 0);
    
    if (socket_desc == -1)
    {
        puts("Could not create socket");
        return 1;
    }
     
    server.sin_family = AF_INET;  //IPv4 Internet protocols
    server.sin_addr.s_addr = INADDR_ANY; //IPv4 local host address
    server.sin_port = htons(8895); // server will listen to 8895 port
     
    // Bind
    if(bind(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0)
    {
        puts("Binding failed");
        return 1;
    }
    puts("Socket is binded");
     
    // Listen
    listen(socket_desc, 3);
     
    // Accept and incoming connection
    puts("Waiting for incoming connections...");
    
    c = sizeof(struct sockaddr_in);
    new_socket= accept(socket_desc,(struct sockaddr *)&client,(socklen_t*)&c);
    if (new_socket<0)
    {
        puts("Accept failed");
        return 1;
    }
     
    puts("Connection accepted");
    //message = "\n\nHello client, I received your connection. Bye now\n\n";
    int choice = 1;

    while(choice != 0){

        recv(new_socket, received_message, 1000, 0);
        int ret = strcmp(received_message,"quit");
        printf("\nreturn value of strcmp():%d\n",ret);
        printf("\nreceived message:%s",received_message);

        if(ret == 0){
            choice = 0;
        }
       
    }

    close(socket_desc);
    close(new_socket); 

    return 0;
}

Output:

Telnet Console:

Server Console:

what's wrong with this code? Can anyone help?