client.c

#include "ftp.h"

int main() {
    int client_socket;
    struct sockaddr_in server_addr;
    char buffer[BUFFER_SIZE];
    char command[64], filename[MAX_FILENAME];

    // Create socket
    client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket < 0) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }

    // Configure server address
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(2121);   // Must match the server port
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // localhost

    // Connect to server
    if (connect(client_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("Connection failed");
        close(client_socket);
        exit(EXIT_FAILURE);
    }

    printf("Connected to FTP Server.\n");

    // Receive initial response
    receive_response(client_socket, buffer, sizeof(buffer));
    printf("Server: %s\n", buffer);

    while (1) {
        printf("ftp> ");
        fflush(stdout);

        // Read command from user
        if (fgets(buffer, sizeof(buffer), stdin) == NULL)
            break;

        // Trim newline
        buffer[strcspn(buffer, "\n")] = 0;

        if (strlen(buffer) == 0)
            continue;

        // Send command to server
        if (send(client_socket, buffer, strlen(buffer), 0) < 0) {
            perror("send");
            break;
        }

        // Parse command
        sscanf(buffer, "%63s %255s", command, filename);

        if (strcmp(command, CMD_LIST) == 0) {
            // Expect list of files
            receive_response(client_socket, buffer, sizeof(buffer));
            printf("Server: %s\n", buffer);
            if (strncmp(buffer, RESP_OK, 3) == 0) {
                recv(client_socket, buffer, sizeof(buffer) - 1, 0);
                printf("%s\n", buffer);
            }

        } else if (strcmp(command, CMD_GET) == 0) {
            receive_response(client_socket, buffer, sizeof(buffer));
            printf("Server: %s\n", buffer);
            if (strncmp(buffer, RESP_OK, 3) == 0) {
                receive_file(client_socket, filename);
            }

        } else if (strcmp(command, CMD_PUT) == 0) {
            receive_response(client_socket, buffer, sizeof(buffer));
            printf("Server: %s\n", buffer);
            if (strncmp(buffer, RESP_OK, 3) == 0) {
                send_file(client_socket, filename);
            }

        } else if (strcmp(command, CMD_QUIT) == 0) {
            receive_response(client_socket, buffer, sizeof(buffer));
            printf("Server: %s\n", buffer);
            break;

        } else {
            receive_response(client_socket, buffer, sizeof(buffer));
            printf("Server: %s\n", buffer);
        }
    }

    printf("Disconnected.\n");
    close(client_socket);
    return 0;
}