517 lines
17 KiB
C
517 lines
17 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <pthread.h>
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#include <netinet/tcp.h>
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#define MAX_BUFFER 1024
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#define MAX_USERS 100
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#define MAX_FRIENDS 50
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#define PORT 8888
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// 用户结构体
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typedef struct {
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char username[50];
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char password[50];
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int friends[MAX_FRIENDS];
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int friend_count;
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int online;
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int socket; // 添加socket字段
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} User;
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// 全局变量
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User users[MAX_USERS];
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int user_count = 0;
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pthread_mutex_t users_mutex = PTHREAD_MUTEX_INITIALIZER;
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// 函数声明
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void load_users();
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void save_users();
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int find_user(const char* username);
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void* handle_client(void* arg);
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void process_login(int client_socket, char* buffer);
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void process_register(int client_socket, char* buffer);
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void process_add_friend(int client_socket, char* buffer);
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void process_remove_friend(int client_socket, char* buffer);
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void process_chat(int client_socket, char* buffer);
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void display_online_users(); // 新增函数声明
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void process_get_friends(int client_socket, char* buffer);
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int main() {
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int server_socket, client_socket;
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struct sockaddr_in server_addr, client_addr;
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socklen_t client_len = sizeof(client_addr);
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pthread_t thread_id;
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// 加载用户数据
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load_users();
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// 创建socket
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server_socket = socket(AF_INET, SOCK_STREAM, 0);
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if (server_socket < 0) {
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perror("创建Socket失败");
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exit(EXIT_FAILURE);
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}
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// 设置服务器地址
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memset(&server_addr, 0, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_addr.s_addr = INADDR_ANY;
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server_addr.sin_port = htons(PORT);
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// 绑定socket
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if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
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perror("绑定失败");
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exit(EXIT_FAILURE);
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}
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// 监听连接
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if (listen(server_socket, 5) < 0) {
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perror("监听失败");
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exit(EXIT_FAILURE);
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}
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printf("服务器已启动，监听端口 %d\n", PORT);
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// 接受客户端连接
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while (1) {
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client_socket = accept(server_socket, (struct sockaddr*)&client_addr, &client_len);
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if (client_socket < 0) {
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perror("接受连接失败");
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continue;
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}
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printf("新客户端连接：%s:%d\n",inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
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// 为每个客户端创建新线程
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if (pthread_create(&thread_id, NULL, handle_client, (void*)&client_socket) != 0) {
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perror("创建线程失败");
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close(client_socket);
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}
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}
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close(server_socket);
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return 0;
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}
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void load_users() {
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FILE* file = fopen("Users.txt", "r");
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if (file == NULL) {
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printf("未找到用户文件，将创建新文件。\n");
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return;
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}
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while (fscanf(file, "%s %s %d", users[user_count].username,
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users[user_count].password, &users[user_count].friend_count) == 3) {
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for (int i = 0; i < users[user_count].friend_count; i++) {
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fscanf(file, "%d", &users[user_count].friends[i]);
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}
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users[user_count].online = 0;
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users[user_count].socket = -1;
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user_count++;
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}
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fclose(file);
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}
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void save_users() {
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FILE* file = fopen("Users.txt", "w");
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if (file == NULL) {
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perror("无法打开用户文件");
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return;
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}
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for (int i = 0; i < user_count; i++) {
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fprintf(file, "%s %s %d", users[i].username,
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users[i].password, users[i].friend_count);
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for (int j = 0; j < users[i].friend_count; j++) {
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fprintf(file, " %d", users[i].friends[j]);
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}
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fprintf(file, "\n");
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}
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fclose(file);
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}
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int find_user(const char* username) {
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for (int i = 0; i < user_count; i++) {
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if (strcmp(users[i].username, username) == 0) {
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return i;
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}
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}
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return -1;
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}
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void* handle_client(void* arg) {
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int client_socket = *((int*)arg);
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char buffer[MAX_BUFFER];
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int user_index = -1;
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// 设置socket选项，启用保活机制
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int keepalive = 1;
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int keepidle = 5; // 5秒没有数据交互就开始探测
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int keepinterval = 2; // 探测间隔2秒
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int keepcount = 3; // 探测3次无响应就断开
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setsockopt(client_socket, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(keepalive));
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setsockopt(client_socket, IPPROTO_TCP, TCP_KEEPIDLE, &keepidle, sizeof(keepidle));
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setsockopt(client_socket, IPPROTO_TCP, TCP_KEEPINTVL, &keepinterval, sizeof(keepinterval));
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setsockopt(client_socket, IPPROTO_TCP, TCP_KEEPCNT, &keepcount, sizeof(keepcount));
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while (1) {
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memset(buffer, 0, MAX_BUFFER);
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int bytes_received = recv(client_socket, buffer, MAX_BUFFER, 0);
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// 检查连接状态
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if (bytes_received <= 0) {
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pthread_mutex_lock(&users_mutex);
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// 查找并更新断开连接的用户状态
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for (int i = 0; i < user_count; i++) {
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if (users[i].socket == client_socket) {
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user_index = i;
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users[i].online = 0;
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users[i].socket = -1;
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printf("\n用户 %s 断开连接\n", users[i].username);
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// 通知所有在线好友
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for (int j = 0; j < users[i].friend_count; j++) {
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int friend_index = users[i].friends[j];
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if (users[friend_index].online && users[friend_index].socket != -1) {
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char notify[MAX_BUFFER];
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sprintf(notify, "系统消息: 您的好友 %s 已离线", users[i].username);
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send(users[friend_index].socket, notify, MAX_BUFFER, 0);
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}
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}
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break;
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}
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}
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save_users();
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display_online_users();
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pthread_mutex_unlock(&users_mutex);
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break;
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}
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char command[20];
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sscanf(buffer, "%s", command);
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if (strcmp(command, "LOGIN") == 0) {
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process_login(client_socket, buffer);
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// 更新user_index
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for (int i = 0; i < user_count; i++) {
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if (users[i].socket == client_socket) {
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user_index = i;
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break;
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}
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}
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}
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else if (strcmp(command, "REGISTER") == 0) {
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process_register(client_socket, buffer);
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}
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else if (strcmp(command, "ADDFRIEND") == 0) {
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process_add_friend(client_socket, buffer);
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}
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else if (strcmp(command, "REMOVEFRIEND") == 0) {
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process_remove_friend(client_socket, buffer);
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}
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else if (strcmp(command, "CHAT") == 0) {
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process_chat(client_socket, buffer);
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}
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else if (strcmp(command, "LOGOUT") == 0) {
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pthread_mutex_lock(&users_mutex);
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// 查找当前用户
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for (int i = 0; i < user_count; i++) {
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if (users[i].socket == client_socket) {
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user_index = i;
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break;
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}
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}
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if (user_index != -1) {
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users[user_index].online = 0;
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users[user_index].socket = -1;
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// 通知所有在线好友
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for (int i = 0; i < users[user_index].friend_count; i++) {
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int friend_index = users[user_index].friends[i];
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if (users[friend_index].online && users[friend_index].socket != -1) {
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char notify[MAX_BUFFER];
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sprintf(notify, "系统消息: 您的好友 %s 已离线", users[user_index].username);
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send(users[friend_index].socket, notify, MAX_BUFFER, 0);
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}
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}
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save_users();
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printf("\n用户 %s 退出登录\n", users[user_index].username);
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display_online_users();
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}
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pthread_mutex_unlock(&users_mutex);
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break;
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}
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else if (strcmp(command, "GETFRIENDS") == 0) {
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process_get_friends(client_socket, buffer);
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}
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}
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// 确保在断开连接时清理用户状态
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if (user_index != -1) {
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pthread_mutex_lock(&users_mutex);
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users[user_index].online = 0;
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users[user_index].socket = -1;
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save_users();
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display_online_users();
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pthread_mutex_unlock(&users_mutex);
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}
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close(client_socket);
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return NULL;
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}
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void process_login(int client_socket, char* buffer) {
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char username[50], password[50];
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sscanf(buffer, "LOGIN %s %s", username, password);
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pthread_mutex_lock(&users_mutex);
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int user_index = find_user(username);
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if (user_index == -1) {
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send(client_socket, "FAIL 用户不存在", MAX_BUFFER, 0);
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}
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else if (strcmp(users[user_index].password, password) != 0) {
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send(client_socket, "FAIL 密码错误", MAX_BUFFER, 0);
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}
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else {
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// 如果用户已经在线，先将其标记为离线
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if (users[user_index].online) {
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users[user_index].online = 0;
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users[user_index].socket = -1;
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}
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// 更新用户状态
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users[user_index].online = 1;
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users[user_index].socket = client_socket;
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save_users();
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char response[MAX_BUFFER];
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snprintf(response, MAX_BUFFER, "SUCCESS %d", user_index);
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send(client_socket, response, MAX_BUFFER, 0);
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printf("\n用户 %s 登录成功\n", username);
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// 通知所有在线好友
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for (int i = 0; i < users[user_index].friend_count; i++) {
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int friend_index = users[user_index].friends[i];
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if (users[friend_index].online && users[friend_index].socket != -1) {
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char notify[MAX_BUFFER];
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snprintf(notify, MAX_BUFFER, "系统消息: 您的好友 %s 已上线", username);
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send(users[friend_index].socket, notify, MAX_BUFFER, 0);
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}
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}
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display_online_users();
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}
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pthread_mutex_unlock(&users_mutex);
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}
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void process_register(int client_socket, char* buffer) {
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char username[50], password[50];
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sscanf(buffer, "REGISTER %s %s", username, password);
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pthread_mutex_lock(&users_mutex);
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if (find_user(username) != -1) {
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send(client_socket, "FAIL 用户名已存在", MAX_BUFFER, 0);
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}
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else if (user_count >= MAX_USERS) {
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send(client_socket, "FAIL 用户数量已达上限", MAX_BUFFER, 0);
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}
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else {
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strcpy(users[user_count].username, username);
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strcpy(users[user_count].password, password);
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users[user_count].friend_count = 0;
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users[user_count].online = 0;
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users[user_count].socket = -1;
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user_count++;
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save_users();
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send(client_socket, "SUCCESS", MAX_BUFFER, 0);
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}
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pthread_mutex_unlock(&users_mutex);
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}
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void process_add_friend(int client_socket, char* buffer) {
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int user_index;
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char friend_name[50];
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sscanf(buffer, "ADDFRIEND %d %s", &user_index, friend_name);
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|||
|
|
|
|||
|
|
pthread_mutex_lock(&users_mutex);
|
|||
|
|
int friend_index = find_user(friend_name);
|
|||
|
|
|
|||
|
|
if (friend_index == -1) {
|
|||
|
|
send(client_socket, "FAIL 好友不存在", MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
else if (user_index == friend_index) {
|
|||
|
|
send(client_socket, "FAIL 不能添加自己为好友", MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
// 检查是否已经是好友
|
|||
|
|
for (int i = 0; i < users[user_index].friend_count; i++) {
|
|||
|
|
if (users[user_index].friends[i] == friend_index) {
|
|||
|
|
send(client_socket, "FAIL 已经是好友关系", MAX_BUFFER, 0);
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 添加好友
|
|||
|
|
users[user_index].friends[users[user_index].friend_count++] = friend_index;
|
|||
|
|
users[friend_index].friends[users[friend_index].friend_count++] = user_index;
|
|||
|
|
save_users();
|
|||
|
|
send(client_socket, "SUCCESS", MAX_BUFFER, 0);
|
|||
|
|
|
|||
|
|
// 通知被添加的用户
|
|||
|
|
if (users[friend_index].online && users[friend_index].socket != -1) {
|
|||
|
|
char notify[MAX_BUFFER];
|
|||
|
|
snprintf(notify, MAX_BUFFER, "系统消息: %s 添加您为好友", users[user_index].username);
|
|||
|
|
send(users[friend_index].socket, notify, MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void process_remove_friend(int client_socket, char* buffer) {
|
|||
|
|
int user_index;
|
|||
|
|
char friend_name[50];
|
|||
|
|
sscanf(buffer, "REMOVEFRIEND %d %s", &user_index, friend_name);
|
|||
|
|
|
|||
|
|
pthread_mutex_lock(&users_mutex);
|
|||
|
|
int friend_index = find_user(friend_name);
|
|||
|
|
|
|||
|
|
if (friend_index == -1) {
|
|||
|
|
send(client_socket, "FAIL 好友不存在", MAX_BUFFER, 0);
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int found = 0;
|
|||
|
|
// 从用户的好友列表中移除
|
|||
|
|
for (int i = 0; i < users[user_index].friend_count; i++) {
|
|||
|
|
if (users[user_index].friends[i] == friend_index) {
|
|||
|
|
for (int j = i; j < users[user_index].friend_count - 1; j++) {
|
|||
|
|
users[user_index].friends[j] = users[user_index].friends[j + 1];
|
|||
|
|
}
|
|||
|
|
users[user_index].friend_count--;
|
|||
|
|
found = 1;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (found) {
|
|||
|
|
// 从好友的好友列表中移除
|
|||
|
|
for (int i = 0; i < users[friend_index].friend_count; i++) {
|
|||
|
|
if (users[friend_index].friends[i] == user_index) {
|
|||
|
|
for (int j = i; j < users[friend_index].friend_count - 1; j++) {
|
|||
|
|
users[friend_index].friends[j] = users[friend_index].friends[j + 1];
|
|||
|
|
}
|
|||
|
|
users[friend_index].friend_count--;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
save_users();
|
|||
|
|
|
|||
|
|
// 发送成功响应
|
|||
|
|
send(client_socket, "FRIEND_REMOVE_SUCCESS", MAX_BUFFER, 0);
|
|||
|
|
|
|||
|
|
// 发送通知给被删除的好友
|
|||
|
|
if (users[friend_index].online && users[friend_index].socket != -1) {
|
|||
|
|
char notify[MAX_BUFFER];
|
|||
|
|
snprintf(notify, MAX_BUFFER, "FRIEND_REMOVE %s 将您从好友列表中移除",
|
|||
|
|
users[user_index].username);
|
|||
|
|
send(users[friend_index].socket, notify, MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
} else {
|
|||
|
|
send(client_socket, "FAIL 不是好友关系", MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void process_chat(int client_socket, char* buffer) {
|
|||
|
|
int user_index, friend_index;
|
|||
|
|
char message[MAX_BUFFER];
|
|||
|
|
sscanf(buffer, "CHAT %d %d %[^\n]", &user_index, &friend_index, message);
|
|||
|
|
pthread_mutex_lock(&users_mutex);
|
|||
|
|
// 验证是否是好友关系
|
|||
|
|
int is_friend = 0;
|
|||
|
|
for (int i = 0; i < users[user_index].friend_count; i++) {
|
|||
|
|
if (users[user_index].friends[i] == friend_index) {
|
|||
|
|
is_friend = 1;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (!is_friend) {
|
|||
|
|
send(client_socket, "FAIL 不是好友关系", MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
char response[MAX_BUFFER];
|
|||
|
|
// 限制 message 长度，防止溢出
|
|||
|
|
char safe_message[MAX_BUFFER/2];
|
|||
|
|
strncpy(safe_message, message, sizeof(safe_message) - 1);
|
|||
|
|
safe_message[sizeof(safe_message) - 1] = '\0';
|
|||
|
|
int n = snprintf(response, MAX_BUFFER, "CHAT %s: %s", users[user_index].username, safe_message);
|
|||
|
|
if (n < 0 || n >= MAX_BUFFER) {
|
|||
|
|
// 被截断，补上 ...
|
|||
|
|
strcpy(&response[MAX_BUFFER-5], "...");
|
|||
|
|
}
|
|||
|
|
// 发送给发送者
|
|||
|
|
send(client_socket, response, MAX_BUFFER, 0);
|
|||
|
|
// 发送给接收者
|
|||
|
|
if (users[friend_index].online && users[friend_index].socket != -1) {
|
|||
|
|
send(users[friend_index].socket, response, MAX_BUFFER, 0);
|
|||
|
|
} else {
|
|||
|
|
// 好友不在线，给发送者提示
|
|||
|
|
send(client_socket, "系统消息: 对方不在线，消息未送达", MAX_BUFFER, 0);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 新增函数：显示在线用户
|
|||
|
|
void display_online_users() {
|
|||
|
|
printf("\n当前在线用户：\n");
|
|||
|
|
int online_count = 0;
|
|||
|
|
for (int i = 0; i < user_count; i++) {
|
|||
|
|
if (users[i].online) {
|
|||
|
|
printf("%d. %s\n", ++online_count, users[i].username);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if (online_count == 0) {
|
|||
|
|
printf("暂无在线用户\n");
|
|||
|
|
}
|
|||
|
|
printf("------------------------\n");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 新增函数：处理获取好友列表请求
|
|||
|
|
void process_get_friends(int client_socket, char* buffer) {
|
|||
|
|
int user_index;
|
|||
|
|
sscanf(buffer, "GETFRIENDS %d", &user_index);
|
|||
|
|
|
|||
|
|
pthread_mutex_lock(&users_mutex);
|
|||
|
|
char response[MAX_BUFFER] = "FRIENDLIST ";
|
|||
|
|
char temp[64];
|
|||
|
|
|
|||
|
|
for (int i = 0; i < users[user_index].friend_count; i++) {
|
|||
|
|
int friend_index = users[user_index].friends[i];
|
|||
|
|
int n = snprintf(temp, sizeof(temp), "%s,%d ", users[friend_index].username, friend_index);
|
|||
|
|
if (n < 0 || n >= sizeof(temp)) {
|
|||
|
|
strcpy(&temp[sizeof(temp)-5], "...");
|
|||
|
|
}
|
|||
|
|
if (strlen(response) + strlen(temp) < MAX_BUFFER) {
|
|||
|
|
strcat(response, temp);
|
|||
|
|
} else {
|
|||
|
|
strcat(response, "...");
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
send(client_socket, response, MAX_BUFFER, 0);
|
|||
|
|
pthread_mutex_unlock(&users_mutex);
|
|||
|
|
}
|