ftpcmd_y.txt

基于UNIX的FTP源代码

/*	$OpenBSD: ftpcmd.y,v 1.50 2008/06/30 12:03:51 ragge Exp $	*/
/*	$NetBSD: ftpcmd.y,v 1.7 1996/04/08 19:03:11 jtc Exp $	*/

/*
 * Copyright (c) 1985, 1988, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ftpcmd.y	8.3 (Berkeley) 4/6/94
 */

/*
 * Grammar for FTP commands.
 * See RFC 959.
 */

%{

#ifndef lint
#if 0
static const char sccsid[] = "@(#)ftpcmd.y	8.3 (Berkeley) 4/6/94";
#else
static const char rcsid[] =
    "$OpenBSD: ftpcmd.y,v 1.50 2008/06/30 12:03:51 ragge Exp $";
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <netinet/in.h>
#include <arpa/ftp.h>

#include <ctype.h>
#include <errno.h>
#include <glob.h>
#include <pwd.h>
#include <signal.h>
#include <tzfile.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <netdb.h>

#include "monitor.h"
#include "extern.h"

extern	union sockunion data_dest;
extern	int logged_in;
extern	struct passwd *pw;
extern	int guest;
extern	int logging;
extern	int type;
extern	int form;
extern	int debug;
extern	int timeout;
extern	int maxtimeout;
extern  int pdata;
extern	char hostname[], remotehost[];
extern	char proctitle[];
extern	int usedefault;
extern  int transflag;
extern  char tmpline[];
extern	int portcheck;
extern	union sockunion his_addr;
extern	int umaskchange;

off_t	restart_point;

static	int cmd_type;
static	int cmd_form;
static	int cmd_bytesz;
static	int state;
static	int quit;
char	cbuf[512];
char	*fromname;

%}

%union {
	int	i;
	char   *s;
}

%token
	A	B	C	E	F	I
	L	N	P	R	S	T

	SP	CRLF	COMMA	ALL

	USER	PASS	ACCT	REIN	QUIT	PORT
	PASV	TYPE	STRU	MODE	RETR	STOR
	APPE	MLFL	MAIL	MSND	MSOM	MSAM
	MRSQ	MRCP	ALLO	REST	RNFR	RNTO
	ABOR	DELE	CWD	LIST	NLST	SITE
	STAT	HELP	NOOP	MKD	RMD	PWD
	CDUP	STOU	SMNT	SYST	SIZE	MDTM

	LPRT	LPSV	EPRT	EPSV

	UMASK	IDLE	CHMOD

	LEXERR

%token	<s> STRING
%token	<i> NUMBER

%type	<i> check_login check_login_epsvall octal_number byte_size
%type	<i> struct_code mode_code type_code form_code
%type	<s> pathstring pathname password username
%type	<i> host_port host_long_port4 host_long_port6

%start	cmd_list

%%

cmd_list
	: /* empty */
	| cmd_list cmd
		{
			if (fromname) {
				free(fromname);
				fromname = NULL;
			}
			restart_point = (off_t) 0;
		}
	| cmd_list rcmd
	;

cmd
	: USER SP username CRLF
		{
			monitor_user($3);
			free($3);
		}
	| PASS SP password CRLF
		{
			quit = monitor_pass($3);
			memset($3, 0, strlen($3));
			free($3);

			/* Terminate unprivileged pre-auth slave */
			if (quit)
				_exit(0);
		}
	| PORT check_login_epsvall SP host_port CRLF
		{
			if ($2) {
				if ($4) {
					usedefault = 1;
					reply(500,
					    "Illegal PORT rejected (range errors).");
				} else if (portcheck &&
				    ntohs(data_dest.su_sin.sin_port) < IPPORT_RESERVED) {
					usedefault = 1;
					reply(500,
					    "Illegal PORT rejected (reserved port).");
				} else if (portcheck &&
				    memcmp(&data_dest.su_sin.sin_addr,
				    &his_addr.su_sin.sin_addr,
				    sizeof data_dest.su_sin.sin_addr)) {
					usedefault = 1;
					reply(500,
					    "Illegal PORT rejected (address wrong).");
				} else {
					usedefault = 0;
					if (pdata >= 0) {
						(void) close(pdata);
						pdata = -1;
					}
					reply(200, "PORT command successful.");
				}
			}
		}
	| LPRT check_login_epsvall SP host_long_port4 CRLF
		{
			if ($2) {
				/* reject invalid host_long_port4 */
				if ($4) {
					reply(500,
					    "Illegal LPRT command rejected");
					usedefault = 1;
				} else {
					usedefault = 0;
					if (pdata >= 0) {
						(void) close(pdata);
						pdata = -1;
					}
					reply(200, "LPRT command successful.");
				}
			}
		}

	| LPRT check_login_epsvall SP host_long_port6 CRLF
		{
			if ($2) {
				/* reject invalid host_long_port6 */
				if ($4) {
					reply(500,
					    "Illegal LPRT command rejected");
					usedefault = 1;
				} else {
					usedefault = 0;
					if (pdata >= 0) {
						(void) close(pdata);
						pdata = -1;
					}
					reply(200, "LPRT command successful.");
				}
			}
		}

	| EPRT check_login_epsvall SP STRING CRLF
		{
			if ($2)
				extended_port($4);
			free($4);
		}

	| PASV check_login_epsvall CRLF
		{
			if ($2)
				passive();
		}
	| LPSV check_login_epsvall CRLF
		{
			if ($2)
				long_passive("LPSV", PF_UNSPEC);
		}
	| EPSV check_login SP NUMBER CRLF
		{
			if ($2)
				long_passive("EPSV", epsvproto2af($4));
		}
	| EPSV check_login SP ALL CRLF
		{
			if ($2) {
				reply(200, "EPSV ALL command successful.");
				epsvall++;
			}
		}
	| EPSV check_login CRLF
		{
			if ($2)
				long_passive("EPSV", PF_UNSPEC);
		}
	| TYPE check_login SP type_code CRLF
		{
			if ($2) {
				switch (cmd_type) {

				case TYPE_A:
					if (cmd_form == FORM_N) {
						reply(200, "Type set to A.");
						type = cmd_type;
						form = cmd_form;
					} else
						reply(504, "Form must be N.");
					break;

				case TYPE_E:
					reply(504, "Type E not implemented.");
					break;

				case TYPE_I:
					reply(200, "Type set to I.");
					type = cmd_type;
					break;

				case TYPE_L:
					if (cmd_bytesz == 8) {
						reply(200,
						    "Type set to L (byte size 8).");
						    type = cmd_type;
					} else
						reply(504, "Byte size must be 8.");

				}
			}
		}
	| STRU check_login SP struct_code CRLF
		{
			if ($2) {
				switch ($4) {

				case STRU_F:
					reply(200, "STRU F ok.");
					break;

				default:
					reply(504, "Unimplemented STRU type.");
				}
			}
		}
	| MODE check_login SP mode_code CRLF
		{
			if ($2) {
				switch ($4) {

				case MODE_S:
					reply(200, "MODE S ok.");
					break;

				default:
					reply(502, "Unimplemented MODE type.");
				}
			}
		}
	| ALLO check_login SP NUMBER CRLF
		{
			if ($2) {
				reply(202, "ALLO command ignored.");
			}
		}
	| ALLO check_login SP NUMBER SP R SP NUMBER CRLF
		{
			if ($2) {
				reply(202, "ALLO command ignored.");
			}
		}
	| RETR check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				retrieve(NULL, $4);
			if ($4 != NULL)
				free($4);
		}
	| STOR check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				store($4, "w", 0);
			if ($4 != NULL)
				free($4);
		}
	| APPE check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				store($4, "a", 0);
			if ($4 != NULL)
				free($4);
		}
	| NLST check_login CRLF
		{
			if ($2)
				send_file_list(".");
		}
	| NLST check_login SP STRING CRLF
		{
			if ($2 && $4 != NULL)