Remote Backup Server for socket programming in Linux

Write a remote data backup server using TCP or UDP protocol, and run the client to back up local files to the remote server.

Server Function: accepts client requests and backs up client files (which can be backed up to a specified folder ).

Client function: connect to the remote server and send local files to the remote backup server after the connection.

Development Environment: fedora13, Vim, GCC

Copyserver. c file

#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 file

#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;}

Running result: