server_send_receive.c

一个网络传输文件程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include "server_send_receive.h"
#include "input_check.h"
#define MAXBUF 1024
#define FNAMELEN 100

int server_send_receive(int connfd)
{
	int fd,n;
	char buf[MAXBUF];
	char f_name[FNAMELEN];
	bzero(buf,MAXBUF);
	bzero(f_name,FNAMELEN);
	read(connfd,buf,MAXBUF);
	if(strcmp(buf,"CTS")==0){			/**** client to server ****/
		write(connfd,"RTR",8);			/**** Ready To Read *******/
		n=read(connfd, f_name, FNAMELEN);
		buf[n]='\0';
		if(server_checkDIR(f_name)!=0){		/**** check the DIR *******/
			write(connfd,"DERR",4);
			return 1;
		}
		write(connfd,"OK",2);
		fd = open(f_name,O_WRONLY | O_CREAT | O_TRUNC, 0644);
		if(fd<0){
			perror("fail to open");
			return 1;
		}
		while((n=read(connfd,buf,MAXBUF))>0){
			write(fd,buf,n);
		}
		close(fd);
	}
	else if(strcmp(buf,"STC")==0){		/**** server to client ****/
		write(connfd,"RTS",8);			/**** Ready To Send *******/
		n=read(connfd, f_name, FNAMELEN);
		buf[n]='\0';
		if(server_checkfile(f_name)!=0){		/**** check the filename **/
			write(connfd,"FERR",4);
			return 1;
		}

		write(connfd, "OK", 2);
		read(connfd, buf, MAXBUF);
		bzero(buf, MAXBUF);
		fd = open(f_name,O_RDONLY);
		if(fd<0){
			perror("fail to open");
			return 1;
		}
		while((n=read(fd,buf,MAXBUF))>0){
			write(connfd,buf,n);
		}
		close(fd);
   
	}
	return 0;
}