ftpcli.c

一个ftp服务器程序

#include	"ftpdaemon.h"
char    ftplog_file[_POSIX_PATH_MAX];
char    curr_time[80];
int main(int argc, char **argv)
{
	int			sockfd;
	struct sockaddr_in	servaddr;
	char			filename[80];

	if ( argc != 3 ) {
		printf("Usage : ftpcli <IP Address> <filename>\n");
		exit ( 0 );
	}

	strcpy(filename, argv[2]);
	
	sockfd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(FTP_SERV_PORT);
	servaddr.sin_addr.s_addr = inet_addr( argv[1] );

	if (connect(sockfd, (void *)&servaddr, sizeof(servaddr))==-1) {
		perror("connect()");
		exit(-1);
	}

	get_file(sockfd, filename);		/* do it all */

	close ( sockfd );
	exit(0);
}

get_file(int sockfd, char *filename)
{
	char Downname[80];
	FILE *rcvfp;
	char buffer[FILEBUF_SIZE];
	int filelen;
	int num, left, i, j, bytes;
	char ack;

	strcpy(Downname, "/tmp/TESTTEST");
	if ( (rcvfp = fopen(Downname, "wb")) == NULL ) {
		printf("Cannot open file [%s] to write\n", Downname);
		return ;
	}

	if ( send_nbytes(sockfd, filename, NAMELEN) != E_SUCC ) {
		fclose ( rcvfp );
		printf("send_nbytes() fail\n");
		return ;
	}

	if ( recv_nbytes(sockfd, buffer, _FILELEN_, -1) != E_SUCC ) {
		fclose( rcvfp );
		printf("recv_nbyters() fail\n");
		return ;
	}

	filelen = atoi ( buffer );
	if ( filelen <= 0 ) {
		printf("Filelen < 0\n");
		return ;
	}

	num  = filelen / FILEBUF_SIZE;
	left = filelen % FILEBUF_SIZE;
	for ( j=0; j<=num; j++) {
		bytes = ( j == num ) ? left : FILEBUF_SIZE;
		if ( bytes > 0 ) {
			memset(buffer, 0, sizeof(buffer));
			if ( recv_nbytes ( sockfd, buffer, bytes, -1) != E_SUCC ) {
				ack = ACK_FAIL;
				send_nbytes( sockfd, &ack, 1 );
				fclose( rcvfp );
				return ;
			}
			ack = ACK_SUCC;
			if ( send_nbytes( sockfd, &ack, 1) != E_SUCC ) {
				fclose( rcvfp );
				return ;
			}
			if ( fwrite( buffer, bytes, 1, rcvfp ) != 1 ) {
				printf("Fwrite error\n");
				fclose( rcvfp );
				return ;
			}
		}
	}
	printf("File get success...\n");
}