ftp_server.c

用Dynamic C写的ftp程序

/*******************************************************************************
        ftp_server.c
        Z-World, 2000

        Demonstration of a simple FTP server, using the ftp library.
        The user "anonymous" may download the file "rabbitA.gif", but
        not "rabbitF.gif".  The user "foo" (with password "bar") may
        download "rabbitF.gif", and also "rabbitA.gif", since files owned
        by the anonymous user are world-readable.

        Each user may execute the "dir" or "ls" command to see a listing of
        the available files.  The listing shows only the files that the
        logged-in user can access.
*******************************************************************************/
#class auto

// #define FTP_DEBUG

/***********************************
 * Configuration                   *
 * -------------                   *
 * All fields in this section must *
 * be altered to match your local  *
 * network settings.               *
 ***********************************/

/*
 * Pick the predefined TCP/IP configuration for this sample.  See
 * LIB\TCPIP\TCP_CONFIG.LIB for instructions on how to set the
 * configuration.
 */
#define TCPCONFIG 1


/*
 * FTP configuration
 *
 * See the sspec_* and sauth_* functions below to see how to set up
 * files and users for the FTP server.
 */

/*
 * We are not defining any static resources.  Defining the following macro
 * tells ZSERVER.LIB (used by the FTP server) not to look for these static
 * resources.
 */
#define SSPEC_NO_STATIC

/********************************
 * End of configuration section *
 ********************************/

#memmap xmem
#use "dcrtcp.lib"
#use "ftp_server.lib"

#ximport "samples/tcpip/http/pages/rabbit1.gif" rabbit1_gif


/* The empty string at the end is used to calculate string length. */
xstring xtext { "Welcome to the Rabbit FTP server.  Download a file.\r\n", "" };


/**
 * 	Duplicate a string with a four-byte size in front of it.
 * 	Allocates xmem to store size and string.  The "xstring"
 * 	directive does NOT store the size.  To use sspec_addxmemfile(),
 * 	this is required.  Thus the copy which prepends a four-byte size
 * 	value (not including NUL char).  The final xmem2mem() copies the
 * 	string just after the size.
 *
 * 	RETURN: 	physical addr of 4 byte size (string follows, without
 * 			its NUl char termination).
 */
long
xmem_strdup( long xstr )
{
	auto long	xsrc, xnext;
	auto long 	siz;
	auto long 	xdest;

	xmem2root( & xsrc, xstr+0, 4 );
	xmem2root( & xnext, xstr+4, 4 );
	siz = xnext - xsrc - 1;   					// Don't store NUL char.

	xdest = xalloc( (int)siz + 4 );
	root2xmem( xdest, & siz, 4 );
	xmem2xmem( xdest+4, xsrc, (int)siz );

	return( xdest );
}   /* end xmem_strdup() */


/* -------------------------------------------------------------------- */

void main()
{
	int file;
	int user;
	faraddr_t  xdest;

	// Set up the first file and user
	file = sspec_addxmemfile("rabbitA.gif", rabbit1_gif, SERVER_FTP);
	user = sauth_adduser("anonymous", "", SERVER_FTP);
	ftp_set_anonymous(user);
	sspec_setuser(file, user);
	sspec_setuser(sspec_addxmemfile("test1", rabbit1_gif, SERVER_FTP), user);
	sspec_setuser(sspec_addxmemfile("test2", rabbit1_gif, SERVER_FTP), user);

	/*
	 *  Copy the string from one place in XMEMORY to another.  
	 */
	xdest = xmem_strdup( xtext );
	sspec_setuser( sspec_addxmemfile( "README", xdest, SERVER_FTP ), user );

	// Set up the second file and user
	file = sspec_addxmemfile("rabbitF.gif", rabbit1_gif, SERVER_FTP);
	user = sauth_adduser("foo", "bar", SERVER_FTP);
	sspec_setuser(file, user);
	sspec_setuser(sspec_addxmemfile("test3", rabbit1_gif, SERVER_FTP), user);
	sspec_setuser(sspec_addxmemfile("test4", rabbit1_gif, SERVER_FTP), user);
	
	sock_init();
	ftp_init(NULL); /* use default handlers */

	tcp_reserveport(FTP_CMDPORT);	// Port 21
	
	while(1) {
		ftp_tick();
	}
}