client

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

#define BUFFER_SIZE 1024

int main() {
    //accept the server port number and IP address from clients end
    char ip_address[INET_ADDRSTRLEN];
    printf("Enter the server IP address: ");
    scanf("%s", ip_address);

    int port;
    printf("Enter the server port number: ");
    scanf("%d", &port);
    getchar();

    int client_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (client_fd < 0) {
        perror("socket() failed");
        exit(1);
    }

    struct sockaddr_in server_addr = {0};
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr(ip_address);
    server_addr.sin_port = htons(port);

    //client connects to the server
    if (connect(client_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("connect() failed");
        exit(1);
    }

    printf("Connected to server %s:%d\n", inet_ntoa(server_addr.sin_addr), ntohs(server_addr.sin_port));

    while (1) {
        //client reads a string from the terminal and sends it to the server
        char message[BUFFER_SIZE] = {0};
        printf("Enter a message (or 'quit' to exit): ");
        fgets(message, BUFFER_SIZE, stdin);

        if (send(client_fd, message, strlen(message), 0) < 0) {
            perror("send() failed");
            break;
        }

        //communication continues till user types quit at clients end
        if (strcmp(message, "quit\n") == 0) {
            break;
        }
    }

    close(client_fd);

    return 0;
}