linux下socket编程之远程备份服务器

分别采用TCP或UDP协议编写一个远程数据备份服务器，运行客户端将本地文件备份到远程的服务器中。

服务器的功能：接受客户端请求，把客户端的文件进行备份（可以备份到指定的文件夹）。

客户端的功能：与远程服务器进行连接，在连接后把本地的文件发送给远程备份服务器。

开发环境：fedora13，vim，gcc

copyserver.c文件

#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 32
struct 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;
        }
	else
		printf("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文件

#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 32
struct 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;



}

运行结果：