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1、linux c高级编程之实现一个tcp文件服务器和客户端*仅供学习交流使用*实现一个tcp文件服务器，服务器使用的端口号是8888实现以下命令，help: 获取所有命令的帮助信息list: 显示服务器上所有可下载的文件get ：下载文件put ：上传文件quit: 退出客户端服务器源码-#include #include #include #include #include #include #include /* See NOTES */#include #include #include #include #define N 128typedef struct sockaddr SA;vo
2、id ProcessList(int connfd)char bufN;DIR *mydir;struct dirent *myitem;mydir = opendir(.);while (myitem = readdir(mydir) != NULL)if (strcmp(myitem-d_name, .) = 0) | (strcmp(myitem-d_name, .) = 0) continue;strcpy(buf, myitem-d_name);send(connfd, buf, N, 0);closedir(mydir);return;void ProcessGet(int con
3、nfd, char buf)int fd, nbyte;if (fd = open(buf+1, O_RDONLY) 0)send(connfd, buf, nbyte, 0);close(fd);return;void ProcessPut(int connfd, char buf)int fd, nbyte;if (fd = open(buf+1, O_WRONLY|O_CREAT|O_TRUNC, 0666) 0)write(fd, buf, nbyte);close(fd);return;int main(int argc, char *argv)int listenfd, connf
4、d;char bufN;struct sockaddr_in server_addr;/ XXX:step 1 int socket(int domain, int type, int protocol);if (listenfd = socket(PF_INET, SOCK_STREAM, 0) 0)fprintf(stderr, fail to socket : %sn, strerror(errno);exit(-1);#ifdef _DEBUG_printf(socket is %dn, listenfd);#endif / XXX:step 2 int bind(int sockfd
5、, const struct sockaddr *serv_addr, socklen_t addrlen);memset(&server_addr, 0, sizeof(server_addr);server_addr.sin_family = PF_INET;server_addr.sin_port = htons(8888);server_addr.sin_addr.s_addr = htonl(INADDR_ANY);int optval = 1;setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)
6、;if (bind(listenfd, (SA *)&server_addr, sizeof(server_addr) 0)perror(fail to bind);exit(-1);listen(listenfd, 5);while ( 1 )if (connfd = accept(listenfd, NULL, NULL) 0)perror(fail to accept);break;recv(connfd, buf, N, 0);switch (buf0)case L :ProcessList(connfd);break;case G :ProcessGet(connfd, buf);b
7、reak;case P :ProcessPut(connfd, buf);break;close(connfd);return 0;客户端源码-#include #include #include #include #include #include /* See NOTES */#include #include #include #include #define N 128typedef struct sockaddr SA;void PrintHelp()printf(help : display help infon);printf(list : get file list of se
8、rvern);printf(get : get n);printf(put : put n);printf(quit : quit the clientn);return;void ProcessList(struct sockaddr_in server_addr)int sockfd, nbyte;char bufN;if (sockfd = socket(PF_INET, SOCK_STREAM, 0) 0)printf(fail to listn);return;if (connect(sockfd, (SA *)&server_addr, sizeof(server_addr) 0)
9、printf(fail to connect servern);goto ERROR_1;strcpy(buf, L);send(sockfd, buf, N, 0);while (nbyte = recv(sockfd, buf, N, 0) != 0)printf(%sn, buf);ERROR_1:close(sockfd);return;void ProcessGet(struct sockaddr_in server_addr, char command)int sockfd, nbyte, fd;char bufN;if (sockfd = socket(PF_INET, SOCK
10、_STREAM, 0) 0)printf(fail to getn);return;if (connect(sockfd, (SA *)&server_addr, sizeof(server_addr) 0)printf(fail to connect servern);goto ERROR_2;sprintf(buf, G%s, command+4);send(sockfd, buf, N, 0);recv(sockfd, buf, N, 0);if (buf0 = N) / no such fileprintf(No such file on servern);goto ERROR_2;i
11、f (fd = open(command+4, O_WRONLY|O_CREAT|O_TRUNC, 0666) 0)write(fd, buf, nbyte);close(fd);ERROR_2:close(sockfd);return;void ProcessPut(struct sockaddr_in server_addr, char command)int sockfd, fd, nbyte;char bufN;if (sockfd = socket(PF_INET, SOCK_STREAM, 0) 0)printf(fail to getn);return;if (connect(s
12、ockfd, (SA *)&server_addr, sizeof(server_addr) 0)printf(fail to connect servern);goto ERROR_3;if (fd = open(command+4, O_RDONLY) 0)send(sockfd, buf, nbyte, 0);close(fd);ERROR_3:close(sockfd);return;int main(int argc, char *argv)int sockfd, fd, nbyte;char command32;struct sockaddr_in server_addr;if (
13、argc 3)printf(Usage : %s : n, argv0);exit(-1); / XXX:step 1 int socket(int domain, int type, int protocol);if (sockfd = socket(PF_INET, SOCK_STREAM, 0) 0)fprintf(stderr, fail to socket : %sn, strerror(errno);exit(-1);#ifdef _DEBUG_printf(socket is %dn, sockfd);#endif / XXX:step 2 int connect(int soc
14、kfd, const struct sockaddr *serv_addr, socklen_t addrlen);memset(&server_addr, 0, sizeof(server_addr);server_addr.sin_family = PF_INET;server_addr.sin_port = htons(atoi(argv2);server_addr.sin_addr.s_addr = inet_addr(argv1);/server_addr.sin_addr.s_addr = htonl(INADDR_ANY);while ( 1 )printf( );fgets(c
15、ommand, 32, stdin);commandstrlen(command)-1 = 0; / overwrite the nif (strcmp(command, help) = 0)PrintHelp();else if (strcmp(command, list) = 0)ProcessList(server_addr);else if (strncmp(command, get , 4) = 0)ProcessGet(server_addr, command);else if (strncmp(command, put , 4) = 0)ProcessPut(server_addr, command);else if (strcmp(command, quit) = 0)printf(Byen);break;elseprintf(wrong command, help for command listn);return 0;