File: ftpcmd.y

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linux-ftpd 0.17-34
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/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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
 *	NetBSD: ftpcmd.y,v 1.7 1996/04/08 19:03:11 jtc Exp
 *	OpenBSD: ftpcmd.y,v 1.16 1998/05/22 06:46:09 deraadt Exp
 */

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

%{

char ftpcmd_rcsid[] = 
  "$Id: ftpcmd.y,v 1.11 1999/10/09 02:32:12 dholland Exp $";

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

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

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

#if !defined(__linux__) && !defined(__GLIBC__) && !defined(__GNU__)
#include <tzfile.h>
#else
#define TM_YEAR_BASE 1900
#endif

#include "extern.h"

extern	struct sockaddr_storage 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	int use_ipv6;
extern	int use_ipv4;
extern	struct sockaddr_storage his_addr;

off_t	restart_point;

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

struct tab {
	const char	*name;
	short	token;
	short	state;
	short	implemented;	/* 1 if command is implemented */
	const char	*help;
};

static int	 yylex __P((void));
static void	 sizecmd __P((char *));
static void	 help __P((struct tab *, char *));

extern struct tab cmdtab[];
extern struct tab sitetab[];

static int
get_port(struct sockaddr * sa)
{
	switch (sa->sa_family) {
		case AF_INET6:
			return (ntohs(((struct sockaddr_in6 *) sa)->sin6_port));
			break;
		case AF_INET:
		default:
			return (ntohs(((struct sockaddr_in *) sa)->sin_port));
	}
} /* get_port( struct sockaddr * ) */

static int 
cmp_addresses(struct sockaddr * left, struct sockaddr * right)
{
	if (left->sa_family != right->sa_family)
		return 1;

	if (left->sa_family == AF_INET6)
	    return IN6_ARE_ADDR_EQUAL(&((struct sockaddr_in6 *) left)->sin6_addr,
					&((struct sockaddr_in6 *) right)->sin6_addr)
			? 0 : 1;

	return (memcmp(&((struct sockaddr_in *) left)->sin_addr,
			&((struct sockaddr_in *) right)->sin_addr,
			sizeof(struct in_addr)));
} /* cmp_addresses( struct sockaddr *, struct sockaddr * ) */

%}

%union {
	intmax_t i;
	char *s;
	const char *cs;
}

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

	SP	CRLF	COMMA

	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
	EPRT	EPSV

	UMASK	IDLE	CHMOD

	LEXERR

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

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

%start	cmd_list

%%

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

cmd
	: USER SP username CRLF
		{
			user($3);
			free($3);
		}
	| PASS SP password CRLF
		{
			pass($3);
			memset($3, 0, strlen($3));
			free($3);
		}
	| PORT check_login SP host_port CRLF
		{
			if ($2) {
				if ($4) {
					usedefault = 1;
					reply(500,	
					    "Illegal PORT rejected (range errors).");
				} else if (portcheck &&
				    get_port((struct sockaddr *) &data_dest) < IPPORT_RESERVED) {
					usedefault = 1;
					reply(500,
					    "Illegal PORT rejected (reserved port).");
				} else if (portcheck &&
				    data_dest.ss_family == his_addr.ss_family &&
				    cmp_addresses((struct sockaddr *) &data_dest,
				    		    (struct sockaddr *) &his_addr)) {
					usedefault = 1;
					reply(500,
					    "Illegal PORT rejected (address wrong).");
				} else {
					usedefault = 0;
					if (pdata >= 0) {
						(void) close(pdata);
						pdata = -1;
					}
					/* Valid remote address in 'data_dest'. */
					reply(200, "PORT command successful.");
				}
			}
		}
	| EPRT check_login SP transport CRLF
		{
			if ($2) {
				int rc = test_eprt_string($4);

				switch (rc) {
					case 1:	/* Syntax error. */
						reply(500, "Syntax error, command unrecognized.");
						break;
					case 2: /* Protocol family error. */
						reply(522, "Network protocol not supported, use (%c).",
							his_addr.ss_family == AF_INET6 ? '2' : '1');
						break;
					case 3: /* Invalid address and port combination. */
						reply(501, "Illegal EPRT rejected (address wrong).");
						break;
					case 0:	/* Successful parsing. */
						reply(200, "EPRT command successful.");
				}
			}
		}
	| PASV check_login CRLF
		{
			if ($2) {
				passive(0);
			}
		}
	| EPSV check_login CRLF
		{
			if ($2) {
				passive(1);
			}
		}
	| EPSV check_login SP NUMBER CRLF
		{
			if ($2) {
				if ( ($4 == 1 && his_addr.ss_family == AF_INET)
						|| ($4 == 2 && his_addr.ss_family == AF_INET6) )
					passive(1);
				else
					reply(501,
						"Not a compatible address family, use (%c)",
						his_addr.ss_family == AF_INET6 ? '2' : '1');
			}
		}
	| 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((char *) 0, $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)
				send_file_list($4);
			if ($4 != NULL)
				free($4);
		}
	| LIST check_login CRLF
		{
			if ($2)
				retrieve("/bin/ls -lA", "");
		}
	| LIST check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				retrieve("/bin/ls -lA %s", $4);
			if ($4 != NULL)
				free($4);
		}
	| STAT check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				statfilecmd($4);
			if ($4 != NULL)
				free($4);
		}
	| STAT check_login CRLF
		{
			if ($2)
				statcmd();
		}
	| DELE check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				delete($4);
			if ($4 != NULL)
				free($4);
		}
	| RNTO check_login SP pathname CRLF
		{
			if ($2) {
				if (fromname) {
					renamecmd(fromname, $4);
					free(fromname);
					fromname = (char *) 0;
				} else {
					reply(503, 
					  "Bad sequence of commands.");
				}
			}
			free($4);
		}
	| ABOR check_login CRLF
		{
			if ($2) {
				if (pdata >= 0) {
					close(pdata);
					pdata = -1;
					usedefault = 1;
					reply(226, "Closing data connection.");
				} else {
					reply(226, "ABOR command caused no action.");
				}
			}
		}
	| CWD check_login CRLF
		{
			if ($2)
				cwd(pw->pw_dir);
		}
	| CWD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				cwd($4);
			if ($4 != NULL)
				free($4);
		}
	| HELP CRLF
		{
			help(cmdtab, (char *) 0);
		}
	| HELP SP STRING CRLF
		{
			char *cp = $3;

			if (strncasecmp(cp, "SITE", 4) == 0) {
				cp = $3 + 4;
				if (*cp == ' ')
					cp++;
				if (*cp)
					help(sitetab, cp);
				else
					help(sitetab, (char *) 0);
			} else
				help(cmdtab, $3);

			if ($3 != NULL)
				free ($3);
		}
	| NOOP CRLF
		{
			reply(200, "NOOP command successful.");
		}
	| MKD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				makedir($4);
			if ($4 != NULL)
				free($4);
		}
	| RMD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				removedir($4);
			if ($4 != NULL)
				free($4);
		}
	| PWD check_login CRLF
		{
			if ($2)
				pwd();
		}
	| CDUP check_login CRLF
		{
			if ($2)
				cwd("..");
		}
	| SITE SP HELP CRLF
		{
			help(sitetab, (char *) 0);
		}
	| SITE SP HELP SP STRING CRLF
		{
			help(sitetab, $5);

			if ($5 != NULL)
				free ($5);
		}
	| SITE SP UMASK check_login CRLF
		{
			int oldmask;

			if ($4) {
				oldmask = umask(0);
				(void) umask(oldmask);
				reply(200, "Current UMASK is %03o", oldmask);
			}
		}
	| SITE SP UMASK check_login SP octal_number CRLF
		{
			int oldmask;

			if ($4) {
				if (($6 == -1) || ($6 > 0777)) {
					reply(501, "Bad UMASK value");
				} else {
					oldmask = umask($6);
					reply(200,
					    "UMASK set to %03o (was %03o)",
					    $6, oldmask);
				}
			}
		}
	| SITE SP CHMOD check_login SP octal_number SP pathname CRLF
		{
			if ($4 && ($8 != NULL)) {
				if ($6 > 0777)
					reply(501,
				"CHMOD: Mode value must be between 0 and 0777");
				else if (chmod($8, $6) < 0)
					perror_reply(550, $8);
				else
					reply(200, "CHMOD command successful.");
			}
			if ($8 != NULL)
				free($8);
		}
	| SITE SP check_login IDLE CRLF
		{
			if ($3)
			  reply(200,
	       		    "Current IDLE time limit is %d seconds; max %d",
				timeout, maxtimeout);
		}
	| SITE SP check_login IDLE SP NUMBER CRLF
		{
			if ($3) {
				if ($6 < 30 || $6 > maxtimeout) {
				reply(501,
	       		 "Maximum IDLE time must be between 30 and %d seconds",
				    maxtimeout);
				} else {
					timeout = $6;
					(void) alarm((unsigned) timeout);
					reply(200,
					 "Maximum IDLE time set to %d seconds",
					    timeout);
				}
			}
		}
	| STOU check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				store($4, "w", 1);
			if ($4 != NULL)
				free($4);
		}
	| SYST check_login CRLF
		{
			if ($2)
#ifdef __linux__
			reply(215, "UNIX Type: L%d (Linux)", CHAR_BIT);
#else
#ifdef unix
#ifdef BSD
			reply(215, "UNIX Type: L%d Version: BSD-%d",
				CHAR_BIT, BSD);
#else /* BSD */
			reply(215, "UNIX Type: L%d", CHAR_BIT);
#endif /* BSD */
#else /* unix */
			reply(215, "UNKNOWN Type: L%d", CHAR_BIT);
#endif /* unix */
#endif /* __linux__ */
		}

		/*
		 * SIZE is not in RFC959, but Postel has blessed it and
		 * it will be in the updated RFC.
		 *
		 * Return size of file in a format suitable for
		 * using with RESTART (we just count bytes).
		 */
	| SIZE check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				sizecmd($4);
			if ($4 != NULL)
				free($4);
		}

		/*
		 * MDTM is not in RFC959, but Postel has blessed it and
		 * it will be in the updated RFC.
		 *
		 * Return modification time of file as an ISO 3307
		 * style time. E.g. YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx
		 * where xxx is the fractional second (of any precision,
		 * not necessarily 3 digits)
		 */
	| MDTM check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL) {
				struct stat stbuf;
				if (stat($4, &stbuf) < 0)
					reply(550, "%s: %s",
					    $4, strerror(errno));
				else if (!S_ISREG(stbuf.st_mode)) {
					reply(550, "%s: not a plain file.", $4);
				} else {
					struct tm *t;
					t = gmtime(&stbuf.st_mtime);
					reply(213,
					    "%04d%02d%02d%02d%02d%02d",
					    TM_YEAR_BASE + t->tm_year,
					    t->tm_mon+1, t->tm_mday,
					    t->tm_hour, t->tm_min, t->tm_sec);
				}
			}
			if ($4 != NULL)
				free($4);
		}
	| QUIT CRLF
		{
			reply(221, "Goodbye.");
			dologout(0);
		}
	| error CRLF
		{
			yyerrok;
		}
	;
rcmd
	: RNFR check_login SP pathname CRLF
		{
			restart_point = (off_t) 0;
			if ($2 && $4) {
				fromname = renamefrom($4);
				if (fromname == (char *) 0 && $4) {
					free($4);
				}
			} else {
				if ($4)
					free ($4);
			}
		}

	| REST check_login SP byte_size CRLF
		{
			if ($2) {
			    fromname = (char *) 0;
			    restart_point = $4;
			    reply(350, "Restarting at %jd. %s", 
			       (intmax_t) restart_point,
			       "Send STORE or RETRIEVE to initiate transfer.");
			}
		}
	;

username
	: STRING
	;

password
	: /* empty */
		{
			$$ = (char *)calloc(1, sizeof(char));
		}
	| STRING
	;

byte_size
	: NUMBER
	;

host_port
	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
		NUMBER COMMA NUMBER
		{
			char ipaddr[INET6_ADDRSTRLEN], port[12];
			struct addrinfo hints, *aiptr;

			if ($1 < 0 || $1 > 255 || $3 < 0 || $3 > 255 ||
			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255) {
				$$ = 1;
			} else {
				snprintf(ipaddr, sizeof(ipaddr), "%ju.%ju.%ju.%ju",
							$1, $3, $5, $7);
				snprintf(port, sizeof(port), "%ju", 256 * $9 + $11);

				memset(&hints, 0, sizeof(hints));
				hints.ai_family = AF_INET;
				hints.ai_socktype = SOCK_STREAM;
				hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICHOST | AI_NUMERICSERV;

				if (his_addr.ss_family == AF_INET6) {
					hints.ai_family = AF_INET6;
					if (use_ipv4)
						hints.ai_flags |= AI_V4MAPPED;
				}

				if (getaddrinfo(ipaddr, port, &hints, &aiptr)) {
					$$ = 1;
				} else {
					/* Store the generated address in 'data_dest'.
					 * This is the remote host!                    */
					memcpy(&data_dest, aiptr->ai_addr, aiptr->ai_addrlen);
					freeaddrinfo(aiptr);
					$$ = 0;
				}
			}
		}
	;

transport
	: STRING
	;

form_code
	: N
		{
			$$ = FORM_N;
		}
	| T
		{
			$$ = FORM_T;
		}
	| C
		{
			$$ = FORM_C;
		}
	;

type_code
	: A
		{
			cmd_type = TYPE_A;
			cmd_form = FORM_N;
		}
	| A SP form_code
		{
			cmd_type = TYPE_A;
			cmd_form = $3;
		}
	| E
		{
			cmd_type = TYPE_E;
			cmd_form = FORM_N;
		}
	| E SP form_code
		{
			cmd_type = TYPE_E;
			cmd_form = $3;
		}
	| I
		{
			cmd_type = TYPE_I;
		}
	| L
		{
			cmd_type = TYPE_L;
			cmd_bytesz = CHAR_BIT;
		}
	| L SP byte_size
		{
			cmd_type = TYPE_L;
			cmd_bytesz = $3;
		}
		/* this is for a bug in the BBN ftp */
	| L byte_size
		{
			cmd_type = TYPE_L;
			cmd_bytesz = $2;
		}
	;

struct_code
	: F
		{
			$$ = STRU_F;
		}
	| R
		{
			$$ = STRU_R;
		}
	| P
		{
			$$ = STRU_P;
		}
	;

mode_code
	: S
		{
			$$ = MODE_S;
		}
	| B
		{
			$$ = MODE_B;
		}
	| C
		{
			$$ = MODE_C;
		}
	;

pathname
	: pathstring
		{
			/*
			 * Problem: this production is used for all pathname
			 * processing, but only gives a 550 error reply.
			 * This is a valid reply in some cases but not in others.
			 */
			if (logged_in && $1 && strchr($1, '~') != NULL) {
				glob_t gl;
#if defined(__linux__) || defined(__GLIBC__) || defined(__GNU__)
				/* see popen.c */
				int flags = GLOB_NOCHECK;
#else
				int flags =
				 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
#endif
				char *pptr = $1;

				/*
				 * glob() will only find a leading ~, but
				 * Netscape kindly puts a slash in front of
				 * it for publish URLs.  There needs to be
				 * a flag for glob() that expands tildes
				 * anywhere in the string.
				 */
				if ((pptr[0] == '/') && (pptr[1] == '~'))
					pptr++;

				memset(&gl, 0, sizeof(gl));
				if (glob(pptr, flags, NULL, &gl) ||
				    gl.gl_pathc == 0) {
					reply(550, "not found");
					$$ = NULL;
				} else {
					$$ = strdup(gl.gl_pathv[0]);
				}
				globfree(&gl);
				free($1);
			} else
				$$ = $1;
		}
	;

pathstring
	: STRING
	;

octal_number
	: NUMBER
		{
			int ret, dec, multby, digit;

			/*
			 * Convert a number that was read as decimal number
			 * to what it would be if it had been read as octal.
			 */
			dec = $1;
			multby = 1;
			ret = 0;
			while (dec) {
				digit = dec%10;
				if (digit > 7) {
					ret = -1;
					break;
				}
				ret += digit * multby;
				multby *= 8;
				dec /= 10;
			}
			$$ = ret;
		}
	;


check_login
	: /* empty */
		{
			if (logged_in)
				$$ = 1;
			else {
				reply(530, "Please login with USER and PASS.");
				$$ = 0;
			}
		}
	;

%%

extern jmp_buf errcatch;

#define	CMD	0	/* beginning of command */
#define	ARGS	1	/* expect miscellaneous arguments */
#define	STR1	2	/* expect SP followed by STRING */
#define	STR2	3	/* expect STRING */
#define	OSTR	4	/* optional SP then STRING */
#define	ZSTR1	5	/* SP then optional STRING */
#define	ZSTR2	6	/* optional STRING after SP */
#define	SITECMD	7	/* SITE command */
#define	NSTR	8	/* Number followed by a string */

struct tab cmdtab[] = {		/* In order defined in RFC 765 */
	{ "USER", USER, STR1, 1,	"<sp> username" },
	{ "PASS", PASS, ZSTR1, 1,	"<sp> password" },
	{ "ACCT", ACCT, STR1, 0,	"(specify account)" },
	{ "SMNT", SMNT, ARGS, 0,	"(structure mount)" },
	{ "REIN", REIN, ARGS, 0,	"(reinitialize server state)" },
	{ "QUIT", QUIT, ARGS, 1,	"(terminate service)", },
	{ "PORT", PORT, ARGS, 1,	"<sp> b0, b1, b2, b3, b4" },
	{ "PASV", PASV, ARGS, 1,	"(set server in passive mode)" },
	/* Extensions introduced in RFC 2428: EPRT, EPSV. */
	{ "EPRT", EPRT, STR1, 1,	"<sp> <d> addr_fam <d> addr <d> port <d>" },
	{ "EPSV", EPSV, ARGS, 1,	"[ <sp> addr-fam ]"},
	{ "TYPE", TYPE, ARGS, 1,	"<sp> [ A | E | I | L ]" },
	{ "STRU", STRU, ARGS, 1,	"(specify file structure)" },
	{ "MODE", MODE, ARGS, 1,	"(specify transfer mode)" },
	{ "RETR", RETR, STR1, 1,	"<sp> file-name" },
	{ "STOR", STOR, STR1, 1,	"<sp> file-name" },
	{ "APPE", APPE, STR1, 1,	"<sp> file-name" },
	{ "MLFL", MLFL, OSTR, 0,	"(mail file)" },
	{ "MAIL", MAIL, OSTR, 0,	"(mail to user)" },
	{ "MSND", MSND, OSTR, 0,	"(mail send to terminal)" },
	{ "MSOM", MSOM, OSTR, 0,	"(mail send to terminal or mailbox)" },
	{ "MSAM", MSAM, OSTR, 0,	"(mail send to terminal and mailbox)" },
	{ "MRSQ", MRSQ, OSTR, 0,	"(mail recipient scheme question)" },
	{ "MRCP", MRCP, STR1, 0,	"(mail recipient)" },
	{ "ALLO", ALLO, ARGS, 1,	"allocate storage (vacuously)" },
	{ "REST", REST, ARGS, 1,	"<sp> offset (restart command)" },
	{ "RNFR", RNFR, STR1, 1,	"<sp> file-name" },
	{ "RNTO", RNTO, STR1, 1,	"<sp> file-name" },
	{ "ABOR", ABOR, ARGS, 1,	"(abort operation)" },
	{ "DELE", DELE, STR1, 1,	"<sp> file-name" },
	{ "CWD",  CWD,  OSTR, 1,	"[ <sp> directory-name ]" },
	{ "XCWD", CWD,	OSTR, 1,	"[ <sp> directory-name ]" },
	{ "LIST", LIST, OSTR, 1,	"[ <sp> path-name ]" },
	{ "NLST", NLST, OSTR, 1,	"[ <sp> path-name ]" },
	{ "SITE", SITE, SITECMD, 1,	"site-cmd [ <sp> arguments ]" },
	{ "SYST", SYST, ARGS, 1,	"(get type of operating system)" },
	{ "STAT", STAT, OSTR, 1,	"[ <sp> path-name ]" },
	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
	{ "NOOP", NOOP, ARGS, 1,	"" },
	{ "MKD",  MKD,  STR1, 1,	"<sp> path-name" },
	{ "XMKD", MKD,  STR1, 1,	"<sp> path-name" },
	{ "RMD",  RMD,  STR1, 1,	"<sp> path-name" },
	{ "XRMD", RMD,  STR1, 1,	"<sp> path-name" },
	{ "PWD",  PWD,  ARGS, 1,	"(return current directory)" },
	{ "XPWD", PWD,  ARGS, 1,	"(return current directory)" },
	{ "CDUP", CDUP, ARGS, 1,	"(change to parent directory)" },
	{ "XCUP", CDUP, ARGS, 1,	"(change to parent directory)" },
	{ "STOU", STOU, STR1, 1,	"<sp> file-name" },
	{ "SIZE", SIZE, OSTR, 1,	"<sp> path-name" },
	{ "MDTM", MDTM, OSTR, 1,	"<sp> path-name" },
	{ NULL,   0,    0,    0,	0 }
};

struct tab sitetab[] = {
	{ "UMASK", UMASK, ARGS, 1,	"[ <sp> umask ]" },
	{ "IDLE", IDLE, ARGS, 1,	"[ <sp> maximum-idle-time ]" },
	{ "CHMOD", CHMOD, NSTR, 1,	"<sp> mode <sp> file-name" },
	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
	{ NULL,   0,    0,    0,	0 }
};

static void	 help __P((struct tab *, char *));
static struct tab *
		 lookup __P((struct tab *, char *));
static void	 sizecmd __P((char *));
static int	 yylex __P((void));

static struct tab *lookup(struct tab *p, char *cmd)
{

	for (; p->name != NULL; p++)
		if (strcmp(cmd, p->name) == 0)
			return (p);
	return (0);
}

#include <arpa/telnet.h>

/*
 * getline - a hacked up version of fgets to ignore TELNET escape codes.
 */
int ftpd_getline(char *s, int n, FILE *iop)
{
	int c;
	register char *cs;

	cs = s;
/* tmpline may contain saved command from urgent mode interruption */
	for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) {
		*cs++ = tmpline[c];
		if (tmpline[c] == '\n') {
			*cs++ = '\0';
			if (debug)
				syslog(LOG_FTP | LOG_DEBUG, "command: %s", s);
			tmpline[0] = '\0';
			return(0);
		}
		if (c == 0)
			tmpline[0] = '\0';
	}
	while ((c = getc(iop)) != EOF) {
		c &= 0377;
		if (c == IAC) {
		    if ((c = getc(iop)) != EOF) {
			c &= 0377;
			switch (c) {
			case WILL:
			case WONT:
				c = getc(iop);
				printf("%c%c%c", IAC, DONT, 0377&c);
				(void) fflush(stdout);
				continue;
			case DO:
			case DONT:
				c = getc(iop);
				printf("%c%c%c", IAC, WONT, 0377&c);
				(void) fflush(stdout);
				continue;
			case IAC:
				break;
			default:
				continue;	/* ignore command */
			}
		    }
		}
		*cs++ = c;
		if (--n <= 0) {
                       /*
                        * If command doesn't fit into buffer, discard the
                        * rest of the command and indicate truncation.
                        * This prevents the command to be split up into
                        * multiple commands.
                        */
		       while (c != '\n' && (c = getc(iop)) != EOF)
                               ;
                       return (-2);
               }
               if (c == '\n')
			break;
	}
	if (c == EOF && cs == s)
		return (-1);
	*cs++ = '\0';
	if (debug) {
		if (!guest && strncasecmp("pass ", s, 5) == 0) {
			/* Don't syslog passwords */
			syslog(LOG_FTP | LOG_DEBUG, "command: %.5s ???", s);
		} else {
			register char *cp;
			register int len;

			/* Don't syslog trailing CR-LF */
			len = strlen(s);
			cp = s + len - 1;
			while (cp >= s && (*cp == '\n' || *cp == '\r')) {
				--cp;
				--len;
			}
			syslog(LOG_FTP | LOG_DEBUG, "command: %.*s", len, s);
		}
	}
	return (0);
}

void toolong(int signo)
{
	(void)signo;

	reply(421,
	    "Timeout (%d seconds): closing control connection.", timeout);
	if (logging)
		syslog(LOG_FTP | LOG_INFO, "User %s timed out after %d seconds",
		    (pw ? pw -> pw_name : "unknown"), timeout);
	dologout(1);
}

static int yylex(void)
{
	static int cpos, state;
	char *cp, *cp2;
	struct tab *p;
	int n, value;
	char c;

	for (;;) {
		switch (state) {

		case CMD:
			(void) signal(SIGALRM, toolong);
			(void) alarm((unsigned) timeout);
			n=ftpd_getline(cbuf, sizeof(cbuf)-1, stdin);
			if (n == -1) {
				 reply(221, "You could at least say goodbye.");
				 dologout(0);
			} else if (n == -2) {
                                reply(500, "Command too long.");
                                alarm(0);
                                continue;
			}
			(void) alarm(0);
			if ((cp = strchr(cbuf, '\r'))) {
				*cp++ = '\n';
				*cp = '\0';
			}
#ifdef HASSETPROCTITLE
			if (strncasecmp(cbuf, "PASS", 4) != 0) {
				if ((cp = strpbrk(cbuf, "\n"))) {
					c = *cp;
					*cp = '\0';
					setproctitle("%s: %s", proctitle, cbuf);
					*cp = c;
				}
			}
#endif /* HASSETPROCTITLE */
			if ((cp = strpbrk(cbuf, " \n")))
				cpos = cp - cbuf;
			if (cpos == 0)
				cpos = 4;
			c = cbuf[cpos];
			cbuf[cpos] = '\0';
			upper(cbuf);
			p = lookup(cmdtab, cbuf);
			cbuf[cpos] = c;
			if (p != 0) {
				if (p->implemented == 0) {
					nack(p->name);
					longjmp(errcatch,0);
					/* NOTREACHED */
				}
				state = p->state;
				yylval.cs = p->name;
				return (p->token);
			}
			break;

		case SITECMD:
			if (cbuf[cpos] == ' ') {
				cpos++;
				return (SP);
			}
			cp = &cbuf[cpos];
			if ((cp2 = strpbrk(cp, " \n")))
				cpos = cp2 - cbuf;
			c = cbuf[cpos];
			cbuf[cpos] = '\0';
			upper(cp);
			p = lookup(sitetab, cp);
			cbuf[cpos] = c;
			if (p != 0) {
				if (p->implemented == 0) {
					state = CMD;
					nack(p->name);
					longjmp(errcatch,0);
					/* NOTREACHED */
				}
				state = p->state;
				yylval.cs = p->name;
				return (p->token);
			}
			state = CMD;
			break;

		case OSTR:
			if (cbuf[cpos] == '\n') {
				state = CMD;
				return (CRLF);
			}
			/* FALLTHROUGH */

		case STR1:
		case ZSTR1:
		dostr1:
			if (cbuf[cpos] == ' ') {
				cpos++;
				/* DOH!!! who wrote this?
				 * state = ++state; is undefined in C!
				 * state = state == OSTR ? STR2 : ++state;
				 * looks elegant but not correct, adding 'value'
				 */
				value = state == OSTR ? STR2 : ++state;
				state = value;
				return (SP);
			}
			break;

		case ZSTR2:
			if (cbuf[cpos] == '\n') {
				state = CMD;
				return (CRLF);
			}
			/* FALLTHROUGH */

		case STR2:
			cp = &cbuf[cpos];
			n = strlen(cp);
			cpos += n - 1;
			/*
			 * Make sure the string is nonempty and \n terminated.
			 */
			if (n > 1 && cbuf[cpos] == '\n') {
				cbuf[cpos] = '\0';
				yylval.s = strdup(cp);
				if (yylval.s == NULL)
					fatal("Ran out of memory.");
				cbuf[cpos] = '\n';
				state = ARGS;
				return (STRING);
			}
			break;

		case NSTR:
			if (cbuf[cpos] == ' ') {
				cpos++;
				return (SP);
			}
			if (isdigit(cbuf[cpos])) {
				cp = &cbuf[cpos];
				while (isdigit(cbuf[++cpos]))
					;
				c = cbuf[cpos];
				cbuf[cpos] = '\0';
				yylval.i = strtoimax(cp, 0, 10);
				cbuf[cpos] = c;
				state = STR1;
				return (NUMBER);
			}
			state = STR1;
			goto dostr1;

		case ARGS:
			if (isdigit(cbuf[cpos])) {
				cp = &cbuf[cpos];
				while (isdigit(cbuf[++cpos]))
					;
				c = cbuf[cpos];
				cbuf[cpos] = '\0';
				yylval.i = strtoimax(cp, 0, 10);
				cbuf[cpos] = c;
				return (NUMBER);
			}
			switch (cbuf[cpos++]) {

			case '\n':
				state = CMD;
				return (CRLF);

			case ' ':
				return (SP);

			case ',':
				return (COMMA);

			case 'A':
			case 'a':
				return (A);

			case 'B':
			case 'b':
				return (B);

			case 'C':
			case 'c':
				return (C);

			case 'E':
			case 'e':
				return (E);

			case 'F':
			case 'f':
				return (F);

			case 'I':
			case 'i':
				return (I);

			case 'L':
			case 'l':
				return (L);

			case 'N':
			case 'n':
				return (N);

			case 'P':
			case 'p':
				return (P);

			case 'R':
			case 'r':
				return (R);

			case 'S':
			case 's':
				return (S);

			case 'T':
			case 't':
				return (T);

			}
			break;

		default:
			fatal("Unknown state in scanner.");
		}
		yyerror((char *) 0);
		state = CMD;
		longjmp(errcatch,0);
	}
}

void upper(char *s)
{
	while (*s != '\0') {
		if (islower(*s))
			*s = toupper(*s);
		s++;
	}
}

static void help(struct tab *ctab, char *s)
{
	struct tab *c;
	int width, NCMDS;
	const char *type;

	if (ctab == sitetab)
		type = "SITE ";
	else
		type = "";
	width = 0, NCMDS = 0;
	for (c = ctab; c->name != NULL; c++) {
		int len = strlen(c->name);

		if (len > width)
			width = len;
		NCMDS++;
	}
	width = (width + 8) &~ 7;
	if (s == 0) {
		int i, j, w;
		int columns, lines;

		lreply(214, "The following %scommands are recognized %s.",
		    type, "(* =>'s unimplemented)");
		columns = 76 / width;
		if (columns == 0)
			columns = 1;
		lines = (NCMDS + columns - 1) / columns;
		for (i = 0; i < lines; i++) {
			printf("   ");
			for (j = 0; j < columns; j++) {
				c = ctab + j * lines + i;
				printf("%s%c", c->name,
					c->implemented ? ' ' : '*');
				if (c + lines >= &ctab[NCMDS])
					break;
				w = strlen(c->name) + 1;
				while (w < width) {
					putchar(' ');
					w++;
				}
			}
			printf("\r\n");
		}
		(void) fflush(stdout);
		reply(214, "Direct comments to ftp-bugs@%s.", hostname);
		return;
	}
	upper(s);
	c = lookup(ctab, s);
	if (c == (struct tab *)0) {
		reply(502, "Unknown command %s.", s);
		return;
	}
	if (c->implemented)
		reply(214, "Syntax: %s%s %s", type, c->name, c->help);
	else
		reply(214, "%s%-*s\t%s; unimplemented.", type, width,
		    c->name, c->help);
}

static void sizecmd(char *filename)
{
	switch (type) {
	case TYPE_L:
	case TYPE_I: {
		struct stat stbuf;
		if (stat(filename, &stbuf) < 0 || !S_ISREG(stbuf.st_mode))
			reply(550, "%s: not a plain file.", filename);
		else
			reply(213, "%ju", (uintmax_t) stbuf.st_size);
		break; }
	case TYPE_A: {
		FILE *fin;
		int c;
		off_t count;
		struct stat stbuf;
		fin = fopen(filename, "r");
		if (fin == NULL) {
			perror_reply(550, filename);
			return;
		}
		if (fstat(fileno(fin), &stbuf) < 0 || !S_ISREG(stbuf.st_mode)) {
			reply(550, "%s: not a plain file.", filename);
			(void) fclose(fin);
			return;
		}

		count = 0;
		while((c=getc(fin)) != EOF) {
			if (c == '\n')	/* will get expanded to \r\n */
				count++;
			count++;
		}
		(void) fclose(fin);

		reply(213, "%jd", (intmax_t) count);
		break; }
	default:
		reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]);
	}
}