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1、Linux网络编程课程设计班级:姓名:指导老师:一、设计背景Linux操作系统作为一个开源的操作系统被越来越多的人所应用,它的好处在于操作系统源代码的公开化!只要是基于GNU公约的软件你都可以任意使用并修改它的源代码。通过这次课程设计能更好的学习网络编程知识和掌握LINUX平台上应用程序设计开发的过程,将大学四年所学知识综合运用,为未来的工作学习打下基础。二、设计目的1、学习epoll 跟FTP被动模式2、掌握linux基本命令 ,例如ls、cd、login;3、学会如何编译、运营三、环境规定1、centos 64位操作系统2、gcc编译器四、设计原理41客户端 客户端程序的重要任务有以下3个
2、: (1)、分析用户输入的命令。 (2)、根据命令向服务器发出请求 (3)、接受服务器返回请求的结果 客户端为用户提供了3种命令: (1)、get:从服务器下载文献 (2)、list:列出客户端当前目录的内容(3)、quit离开4.2 服务器端(1)、分析请求代码。 (2)、根据请求代码做相应的解决 (3)、等待返回结果或者应答信息五、软件测试结果六、部分主代码#include ftserve.hint main(int argc, char *argv)int sock_listen, sock_control, port, pid;if (argc != 2) printf(usage:
3、./ftserve portn);exit(0);port = atoi(argv1);/ create socketif (sock_listen = socket_create(port) 0 ) perror(Error creating socket);exit(1);while(1) / wait for client request/ create new socket for control connectionif (sock_control = socket_accept(sock_listen) 0 )break;/ create child process to do a
4、ctual file transferif (pid = fork() 0) perror(Error forking child process); else if (pid = 0) close(sock_listen);ftserve_process(sock_control);close(sock_control);exit(0);close(sock_control);close(sock_listen);return 0;/* * Send file specified in filename over data connection, sending * control mess
5、age over control connection * Handles case of null or invalid filename */void ftserve_retr(int sock_control, int sock_data, char* filename)FILE* fd = NULL;char dataMAXSIZE;size_t num_read;fd = fopen(filename, r);if (!fd) / send error code (550 Requested action not taken)send_response(sock_control, 5
6、50); else / send okay (150 File status okay)send_response(sock_control, 150);do num_read = fread(data, 1, MAXSIZE, fd);if (num_read 0) printf(error in fread()n);/ send blockif (send(sock_data, data, num_read, 0) 0);/ send message: 226: closing conn, file transfer successfulsend_response(sock_control
7、, 226);fclose(fd);/* * Send list of files in current directory * over data connection * Return -1 on error, 0 on success */int ftserve_list(int sock_data, int sock_control)char dataMAXSIZE;size_t num_read;FILE* fd;int rs = system(ls -l | tail -n+2 tmp.txt);if ( rs 0) if (send(sock_data, data, num_re
8、ad, 0) 0) perror(err);memset(data, 0, MAXSIZE);fclose(fd);send_response(sock_control, 226);/ send 226return 0;/* * Open data connection to client * Returns: socket for data connection * or -1 on error */int ftserve_start_data_conn(int sock_control)char buf1024;int wait, sock_data;/ Wait for go-ahead
9、 on control connif (recv(sock_control, &wait, sizeof wait, 0) 0 ) perror(Error while waiting);return -1;/ Get client addressstruct sockaddr_in client_addr;socklen_t len = sizeof client_addr;getpeername(sock_control, (struct sockaddr*)&client_addr, &len);inet_ntop(AF_INET, &client_addr.sin_addr, buf,
10、 sizeof(buf);/ Initiate data connection with clientif (sock_data = socket_connect(CLIENT_PORT_ID, buf) 0)return -1;return sock_data;/* * Authenticate a users credentials * Return 1 if authenticated, 0 if not */int ftserve_check_user(char*user, char*pass)char usernameMAXSIZE;char passwordMAXSIZE;char
11、 *pch;char bufMAXSIZE;char *line = NULL;size_t num_read;size_t len = 0;FILE* fd;int auth = 0;fd = fopen(.auth, r);if (fd = NULL) perror(file not found);exit(1);while (num_read = getline(&line, &len, fd) != -1) memset(buf, 0, MAXSIZE);strcpy(buf, line);pch = strtok (buf, );strcpy(username, pch);if (p
12、ch != NULL) pch = strtok (NULL, );strcpy(password, pch);/ remove end of line and whitespacetrimstr(password, (int)strlen(password);if (strcmp(user,username)=0) & (strcmp(pass,password)=0) auth = 1;break;free(line);fclose(fd);return auth;/* * Log in connected client */int ftserve_login(int sock_control)char bufMAXSIZE;char userMAXSIZE;char passMAXSIZE;memset(user, 0, MAXSIZE);m