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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
#define MAX_CLIENTS 10

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 chat!\n";
    char reply_message[1024];

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

    // Set socket options
    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);

    // Bind the socket to localhost port 8080
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // Listen for incoming connections
    if (listen(server_fd, MAX_CLIENTS) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

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

        // Send welcome message to client
        send(new_socket, welcome_message, strlen(welcome_message), 0);

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

            // Get reply from server
            printf("Reply: ");
            fgets(reply_message, 1024, stdin);

            // Send reply to client
            send(new_socket, reply_message, strlen(reply_message), 0);
            printf("Sent: %s\n", reply_message); // Print the sent message

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

    return 0;
}

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];

    // Create socket file descriptor
    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);

    // Convert IPv4 and IPv6 addresses from text to binary form
    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }

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

    // Receive welcome message from server
    valread = read(sock, buffer, 1024);
    printf("%s", buffer);

    // Handle messages to and from the server
    while (1) {
        // Get user input
        printf("Enter message: ");
        fgets(message, 1024, stdin);

        // Send message to server
        send(sock, message, strlen(message), 0);

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

    return 0;
}
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