linux網(wǎng)絡(luò)編程課程設(shè)計(jì)Word版

1、傳播優(yōu)秀Word版文檔 ，希望對(duì)您有幫助，可雙擊去除！Linux網(wǎng)絡(luò)編程課程設(shè)計(jì)班級(jí)：姓名：指導(dǎo)老師：一、設(shè)計(jì)背景Linux操作系統(tǒng)作為一個(gè)開源的操作系統(tǒng)被越來越多的人所應(yīng)用，它的好處在于操作系統(tǒng)源代碼的公開化！只要是基于GNU公約的軟件你都可以任意使用并修改它的源代碼。通過這次課程設(shè)計(jì)能更好的學(xué)習(xí)網(wǎng)絡(luò)編程知識(shí)和掌握LINUX平臺(tái)上應(yīng)用程序設(shè)計(jì)開發(fā)的過程，將大學(xué)四年所學(xué)知識(shí)綜合運(yùn)用，為未來的工作學(xué)習(xí)打下基礎(chǔ)。二、設(shè)計(jì)目的1、學(xué)習(xí)epoll 跟FTP被動(dòng)模式2、掌握linux基本命令 ，例如ls、cd、login；3、學(xué)會(huì)如何編譯、運(yùn)行三、環(huán)境要求1、centos 64位操作系統(tǒng)2、gcc編譯器

2、四、設(shè)計(jì)原理41客戶端 客戶端程序的主要任務(wù)有以下3個(gè)： （1）、分析用戶輸入的命令。 （2）、根據(jù)命令向服務(wù)器發(fā)出請求 （3）、接受服務(wù)器返回請求的結(jié)果 客戶端為用戶提供了3種命令： （1）、get:從服務(wù)器下載文件 （2）、list:列出客戶端當(dāng)前目錄的內(nèi)容（3）、quit離開4.2 服務(wù)器端（1）、分析請求代碼。 （2）、根據(jù)請求代碼做相應(yīng)的處理 （3）、等待返回結(jié)果或者應(yīng)答信息五、軟件測試結(jié)果六、部分主代碼#include ftserve.hint main(int argc, char *argv)int sock_listen, sock_control, port, pid;if

3、 (argc != 2) printf(usage: ./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;/ c

4、reate child process to do actual 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 connect

5、ion, sending * control message 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)se

6、nd_response(sock_control, 550); 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 successfu

7、lsend_response(sock_control, 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 (s

8、end(sock_data, data, num_read, 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, so

9、ck_data;/ Wait for go-ahead 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,

10、&client_addr.sin_addr, buf, 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 usernameMAXSIZ

11、E;char passwordMAXSIZE;char *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, );

12、strcpy(username, pch);if (pch != 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 f

13、tserve_login(int sock_control)char bufMAXSIZE;char userMAXSIZE;char passMAXSIZE;memset(user, 0, MAXSIZE);memset(pass, 0, MAXSIZE);memset(buf, 0, MAXSIZE);/ Wait to recieve usernameif ( (recv_data(sock_control, buf, sizeof(buf) ) = -1) perror(recv errorn); exit(1);int i = 5;int n = 0;while (bufi != 0

14、)usern+ = bufi+;/ tell client were ready for passwordsend_response(sock_control, 331);/ Wait to recieve passwordmemset(buf, 0, MAXSIZE);if ( (recv_data(sock_control, buf, sizeof(buf) ) = -1) perror(recv errorn); exit(1);i = 5;n = 0;while (bufi != 0) passn+ = bufi+;return (ftserve_check_user(user, pa

15、ss);/* * Wait for command from client and * send response * Returns response code */int ftserve_recv_cmd(int sock_control, char*cmd, char*arg)int rc = 200;char bufferMAXSIZE;memset(buffer, 0, MAXSIZE);memset(cmd, 0, 5);memset(arg, 0, MAXSIZE);/ Wait to recieve commandif (recv_data(sock_control, buff

16、er, sizeof(buffer) ) = -1) perror(recv errorn); return -1;strncpy(cmd, buffer, 4);char *tmp = buffer + 5;strcpy(arg, tmp);if (strcmp(cmd, QUIT)=0) rc = 221; else if(strcmp(cmd, USER)=0) | (strcmp(cmd, PASS)=0) |(strcmp(cmd, LIST)=0) | (strcmp(cmd, RETR)=0) rc = 200; else /invalid commandrc = 502;sen

17、d_response(sock_control, rc);return rc;/* * Child process handles connection to client */void ftserve_process(int sock_control)int sock_data;char cmd5;char argMAXSIZE;/ Send welcome messagesend_response(sock_control, 220);/ Authenticate userif (ftserve_login(sock_control) = 1) send_response(sock_con

18、trol, 230); else send_response(sock_control, 430);exit(0);while (1) / Wait for commandint rc = ftserve_recv_cmd(sock_control, cmd, arg);if (rc 0) | (rc = 221) break;if (rc = 200 ) / Open data connection with clientif (sock_data = ftserve_start_data_conn(sock_control) 0) close(sock_control);exit(1); / Execute commandif (strc