分別採用TCP或UDP協議編寫一個遠端資料備份伺服器,運行用戶端將本地檔案備份到遠端伺服器中。
伺服器的功能:接受用戶端請求,把用戶端的檔案進行備份(可以備份到指定的檔案夾)。
用戶端的功能:與遠程伺服器進行串連,在串連後把本地的檔案發送給遠程備份伺服器。
開發環境:fedora13,vim,gcc
copyserver.c檔案
#include<stdio.h>#include<unistd.h>#include<sys/stat.h>#include<fcntl.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<time.h>#include<netdb.h>#include<stdlib.h>#include<string.h>#define PORT 1234#define BACKLOG 5#define MAXSIZE 32struct user{char name[20];char passwd[20];}u,u1;int main(){ int listenfd, connectfd,num; struct sockaddr_in server; struct sockaddr_in client; socklen_t addrlen; char buf[MAXSIZE]; char dir[50];//u.name={"d","a","i","z","h","e"};//u.passwd={"1","1","1","1","1","1"};FILE * fd; if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket() error."); return 0; } int opt = SO_REUSEADDR; setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); bzero(&server, sizeof(server)); server.sin_family = AF_INET; server.sin_port = htons(PORT); server.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1) { perror("bind() error."); return 0; } if(listen(listenfd, BACKLOG) == -1) { perror("listen() error."); return 0; } addrlen = sizeof(client); if((connectfd = accept(listenfd, (struct sockaddr *)&client, &addrlen )) == -1) { perror("accept() error."); return 0; }elseprintf("It's Connected\n");//recv(connectfd,u1.name,20,0);//recv(connectfd,u1.passwd,20,0);//printf("%s",u1.name);printf("Please input directory of copy\n");scanf("%s",dir);fd=fopen(dir,"wb");while(num=recv(connectfd,buf,1,0)>0){fwrite(buf,1,num,fd);}fclose(fd);close(connectfd);return 1;}
copyclient.c檔案
#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<sys/stat.h>#include<fcntl.h>#include<string.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<netdb.h>#define PORT 1234 /*listen port*/#define MAXSIZE 32struct user{char name[20];char passwd[20];}u;int main ( int argc, char *argv[]){ int sockfd,num; struct hostent *he; struct sockaddr_in server;char buf[MAXSIZE]; char dir[50];FILE *fd; if(argc!=2) { printf("usage %s<ip address>\n",argv[0]); return 0; } /*get ip address*/ if((he = gethostbyname(argv[1])) == NULL) { printf("gethostbyname error\n"); return 0; } if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { printf("socket() error \n"); return 0; } bzero(&server, sizeof(server)); server.sin_family = AF_INET; server.sin_port = htons(PORT); server.sin_addr = *((struct in_addr *)he->h_addr); if(connect(sockfd, (struct sockaddr *)&server, sizeof(server)) == -1) { printf("connetc() error\n"); return 0; }printf("connect success.\n");printf("Please input your name:");//scanf("%s",u.name);//printf("Please input your password:");//scanf("%s",u.passwd);//send(sockfd,u.name,20,0);//send(sockfd,u.passwd,20,0);printf("Please input file's directory\n");scanf("%s",dir);fd = fopen(dir,"rb");while((num=fread(buf,1,MAXSIZE,fd))>0){send(sockfd,buf,num,0);}fclose(fd);close(sockfd);return 1;}
運行結果: