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

#define PORT 8080

int main() {
    int sock = 0, valread;
    struct sockaddr_in serv_addr;
    char buffer[1024] = {0};
    char message[1024];


    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\n Socket creation error \n");
        return -1;
    }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }


    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("\nConnection Failed \n");
        return -1;
    }


    valread = read(sock, buffer, 1024);
    printf("%s", buffer);

    while (1) {

        printf("Enter message: ");
        fgets(message, 1024, stdin);

 
        send(sock, message, strlen(message), 0);

 
        valread = read(sock, buffer, 1024);
        printf("Server: %s\n", buffer);
        memset(buffer, 0, sizeof(buffer));
    }

    return 0;
}

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

#define PORT 8080

int main() {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *welcome_message = "Welcome to the echo server!\n";

    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    int opt = 1;
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }


    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    while ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))) {
        printf("New client connected.\n");


        send(new_socket, welcome_message, strlen(welcome_message), 0);


        while ((valread = read(new_socket, buffer, 1024)) > 0) {
            printf("Client: %s\n", buffer);

            send(new_socket, buffer, strlen(buffer), 0);
            printf("Sent: %s\n", buffer); 

            memset(buffer, 0, sizeof(buffer));
        }
    }

    return 0;
}
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