ftpcmd.y revision 1.67 
1/*	$OpenBSD: ftpcmd.y,v 1.67 2019/05/08 23:56:48 tedu Exp $	*/
2/*	$NetBSD: ftpcmd.y,v 1.7 1996/04/08 19:03:11 jtc Exp $	*/
3
4/*
5 * Copyright (c) 1985, 1988, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)ftpcmd.y	8.3 (Berkeley) 4/6/94
33 */
34
35/*
36 * Grammar for FTP commands.
37 * See RFC 959.
38 */
39
40%{
41
42#include <sys/types.h>
43#include <sys/socket.h>
44#include <sys/stat.h>
45
46#include <netinet/in.h>
47#include <arpa/ftp.h>
48
49#include <ctype.h>
50#include <errno.h>
51#include <glob.h>
52#include <pwd.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <syslog.h>
58#include <time.h>
59#include <unistd.h>
60#include <netdb.h>
61#include <limits.h>
62
63#include "monitor.h"
64#include "extern.h"
65
66extern	union sockunion data_dest;
67extern	int logged_in;
68extern	struct passwd *pw;
69extern	int guest;
70extern	int logging;
71extern	int type;
72extern	int form;
73extern	int debug;
74extern	int timeout;
75extern	int maxtimeout;
76extern  int pdata;
77extern	char hostname[], remotehost[];
78extern	char proctitle[];
79extern	int usedefault;
80extern  int transflag;
81extern  char tmpline[];
82extern	int portcheck;
83extern	union sockunion his_addr;
84extern	int umaskchange;
85
86off_t	restart_point;
87
88static	int cmd_type;
89static	int cmd_form;
90static	int cmd_bytesz;
91static	int state;
92static	int quit;
93char	cbuf[512];
94char	*fromname;
95
96%}
97
98%union {
99	int	i;
100	off_t	o;
101	char   *s;
102}
103
104%token
105	A	B	C	E	F	I
106	L	N	P	R	S	T
107
108	SP	CRLF	COMMA	ALL
109
110	USER	PASS	ACCT	REIN	QUIT	PORT
111	PASV	TYPE	STRU	MODE	RETR	STOR
112	APPE	MLFL	MAIL	MSND	MSOM	MSAM
113	MRSQ	MRCP	ALLO	REST	RNFR	RNTO
114	ABOR	DELE	CWD	LIST	NLST	SITE
115	STAT	HELP	NOOP	MKD	RMD	PWD
116	CDUP	STOU	SMNT	SYST	SIZE	MDTM
117
118	LPRT	LPSV	EPRT	EPSV
119
120	UMASK	IDLE	CHMOD
121
122	LEXERR
123
124%token	<s> STRING
125%token	<i> NUMBER
126%token	<o> BIGNUM
127
128%type	<i> check_login check_login_epsvall octal_number byte_size
129%type	<i> struct_code mode_code type_code form_code
130%type	<i> host_port host_long_port4 host_long_port6
131%type	<o> file_size
132%type	<s> pathstring pathname password username
133
134%start	cmd_list
135
136%%
137
138cmd_list
139	: /* empty */
140	| cmd_list cmd
141		{
142			if (fromname) {
143				free(fromname);
144				fromname = NULL;
145			}
146			restart_point = 0;
147		}
148	| cmd_list rcmd
149	;
150
151cmd
152	: USER SP username CRLF
153		{
154			monitor_user($3);
155			free($3);
156		}
157	| PASS SP password CRLF
158		{
159			quit = monitor_pass($3);
160			explicit_bzero($3, strlen($3));
161			free($3);
162
163			/* Terminate unprivileged pre-auth slave */
164			if (quit)
165				_exit(0);
166		}
167	| PORT check_login_epsvall SP host_port CRLF
168		{
169			if ($2) {
170				if ($4) {
171					usedefault = 1;
172					reply(500,
173					    "Illegal PORT rejected (range errors).");
174				} else if (portcheck &&
175				    ntohs(data_dest.su_sin.sin_port) < IPPORT_RESERVED) {
176					usedefault = 1;
177					reply(500,
178					    "Illegal PORT rejected (reserved port).");
179				} else if (portcheck &&
180				    memcmp(&data_dest.su_sin.sin_addr,
181				    &his_addr.su_sin.sin_addr,
182				    sizeof data_dest.su_sin.sin_addr)) {
183					usedefault = 1;
184					reply(500,
185					    "Illegal PORT rejected (address wrong).");
186				} else {
187					usedefault = 0;
188					if (pdata >= 0) {
189						(void) close(pdata);
190						pdata = -1;
191					}
192					reply(200, "PORT command successful.");
193				}
194			}
195		}
196	| LPRT check_login_epsvall SP host_long_port4 CRLF
197		{
198			if ($2) {
199				/* reject invalid host_long_port4 */
200				if ($4) {
201					reply(500,
202					    "Illegal LPRT command rejected");
203					usedefault = 1;
204				} else {
205					usedefault = 0;
206					if (pdata >= 0) {
207						(void) close(pdata);
208						pdata = -1;
209					}
210					reply(200, "LPRT command successful.");
211				}
212			}
213		}
214
215	| LPRT check_login_epsvall SP host_long_port6 CRLF
216		{
217			if ($2) {
218				/* reject invalid host_long_port6 */
219				if ($4) {
220					reply(500,
221					    "Illegal LPRT command rejected");
222					usedefault = 1;
223				} else {
224					usedefault = 0;
225					if (pdata >= 0) {
226						(void) close(pdata);
227						pdata = -1;
228					}
229					reply(200, "LPRT command successful.");
230				}
231			}
232		}
233
234	| EPRT check_login_epsvall SP STRING CRLF
235		{
236			if ($2)
237				extended_port($4);
238			free($4);
239		}
240
241	| PASV check_login_epsvall CRLF
242		{
243			if ($2)
244				passive();
245		}
246	| LPSV check_login_epsvall CRLF
247		{
248			if ($2)
249				long_passive("LPSV", PF_UNSPEC);
250		}
251	| EPSV check_login SP NUMBER CRLF
252		{
253			if ($2)
254				long_passive("EPSV", epsvproto2af($4));
255		}
256	| EPSV check_login SP ALL CRLF
257		{
258			if ($2) {
259				reply(200, "EPSV ALL command successful.");
260				epsvall++;
261			}
262		}
263	| EPSV check_login CRLF
264		{
265			if ($2)
266				long_passive("EPSV", PF_UNSPEC);
267		}
268	| TYPE check_login SP type_code CRLF
269		{
270			if ($2) {
271				switch (cmd_type) {
272
273				case TYPE_A:
274					if (cmd_form == FORM_N) {
275						reply(200, "Type set to A.");
276						type = cmd_type;
277						form = cmd_form;
278					} else
279						reply(504, "Form must be N.");
280					break;
281
282				case TYPE_E:
283					reply(504, "Type E not implemented.");
284					break;
285
286				case TYPE_I:
287					reply(200, "Type set to I.");
288					type = cmd_type;
289					break;
290
291				case TYPE_L:
292					if (cmd_bytesz == 8) {
293						reply(200,
294						    "Type set to L (byte size 8).");
295						    type = cmd_type;
296					} else
297						reply(504, "Byte size must be 8.");
298
299				}
300			}
301		}
302	| STRU check_login SP struct_code CRLF
303		{
304			if ($2) {
305				switch ($4) {
306
307				case STRU_F:
308					reply(200, "STRU F ok.");
309					break;
310
311				default:
312					reply(504, "Unimplemented STRU type.");
313				}
314			}
315		}
316	| MODE check_login SP mode_code CRLF
317		{
318			if ($2) {
319				switch ($4) {
320
321				case MODE_S:
322					reply(200, "MODE S ok.");
323					break;
324
325				default:
326					reply(502, "Unimplemented MODE type.");
327				}
328			}
329		}
330	| ALLO check_login SP NUMBER CRLF
331		{
332			if ($2) {
333				reply(202, "ALLO command ignored.");
334			}
335		}
336	| ALLO check_login SP NUMBER SP R SP NUMBER CRLF
337		{
338			if ($2) {
339				reply(202, "ALLO command ignored.");
340			}
341		}
342	| RETR check_login SP pathname CRLF
343		{
344			if ($2 && $4 != NULL)
345				retrieve(RET_FILE, $4);
346			if ($4 != NULL)
347				free($4);
348		}
349	| STOR check_login SP pathname CRLF
350		{
351			if ($2 && $4 != NULL)
352				store($4, "w", 0);
353			if ($4 != NULL)
354				free($4);
355		}
356	| APPE check_login SP pathname CRLF
357		{
358			if ($2 && $4 != NULL)
359				store($4, "a", 0);
360			if ($4 != NULL)
361				free($4);
362		}
363	| NLST check_login CRLF
364		{
365			if ($2)
366				send_file_list(".");
367		}
368	| NLST check_login SP STRING CRLF
369		{
370			if ($2 && $4 != NULL)
371				send_file_list($4);
372			free($4);
373		}
374	| LIST check_login CRLF
375		{
376			if ($2)
377				retrieve(RET_LIST, NULL);
378		}
379	| LIST check_login SP pathname CRLF
380		{
381			if ($2 && $4 != NULL)
382				retrieve(RET_LIST, $4);
383			if ($4 != NULL)
384				free($4);
385		}
386	| STAT check_login SP pathname CRLF
387		{
388			if ($2 && $4 != NULL)
389				statfilecmd($4);
390			if ($4 != NULL)
391				free($4);
392		}
393	| STAT check_login CRLF
394		{
395			if ($2)
396				statcmd();
397		}
398	| DELE check_login SP pathname CRLF
399		{
400			if ($2 && $4 != NULL)
401				delete($4);
402			if ($4 != NULL)
403				free($4);
404		}
405	| RNTO check_login SP pathname CRLF
406		{
407			if ($2 && $4 != NULL) {
408				if (fromname) {
409					renamecmd(fromname, $4);
410					free(fromname);
411					fromname = NULL;
412				} else {
413					reply(503,
414					  "Bad sequence of commands.");
415				}
416			}
417			if ($4 != NULL)
418				free($4);
419		}
420	| ABOR check_login CRLF
421		{
422			if ($2)
423				reply(225, "ABOR command successful.");
424		}
425	| CWD check_login CRLF
426		{
427			if ($2)
428				cwd(pw->pw_dir);
429		}
430	| CWD check_login SP pathname CRLF
431		{
432			if ($2 && $4 != NULL)
433				cwd($4);
434			if ($4 != NULL)
435				free($4);
436		}
437	| HELP CRLF
438		{
439			help(cmdtab, NULL);
440		}
441	| HELP SP STRING CRLF
442		{
443			char *cp = $3;
444
445			if (strncasecmp(cp, "SITE", 4) == 0) {
446				cp = $3 + 4;
447				if (*cp == ' ')
448					cp++;
449				if (*cp)
450					help(sitetab, cp);
451				else
452					help(sitetab, NULL);
453			} else
454				help(cmdtab, $3);
455			free ($3);
456		}
457	| NOOP CRLF
458		{
459			reply(200, "NOOP command successful.");
460		}
461	| MKD check_login SP pathname CRLF
462		{
463			if ($2 && $4 != NULL)
464				makedir($4);
465			if ($4 != NULL)
466				free($4);
467		}
468	| RMD check_login SP pathname CRLF
469		{
470			if ($2 && $4 != NULL)
471				removedir($4);
472			if ($4 != NULL)
473				free($4);
474		}
475	| PWD check_login CRLF
476		{
477			if ($2)
478				pwd();
479		}
480	| CDUP check_login CRLF
481		{
482			if ($2)
483				cwd("..");
484		}
485	| SITE SP HELP CRLF
486		{
487			help(sitetab, NULL);
488		}
489	| SITE SP HELP SP STRING CRLF
490		{
491			help(sitetab, $5);
492			free ($5);
493		}
494	| SITE SP UMASK check_login CRLF
495		{
496			mode_t oldmask;
497
498			if ($4) {
499				oldmask = umask(0);
500				(void) umask(oldmask);
501				reply(200, "Current UMASK is %03o", oldmask);
502			}
503		}
504	| SITE SP UMASK check_login SP octal_number CRLF
505		{
506			mode_t oldmask;
507
508			if ($4) {
509				if (($6 == -1) || ($6 > 0777)) {
510					reply(501, "Bad UMASK value");
511				} else if (!umaskchange) {
512					reply(550,
513					    "No permission to change umask.");
514				} else {
515					oldmask = umask($6);
516					reply(200,
517					    "UMASK set to %03o (was %03o)",
518					    $6, oldmask);
519				}
520			}
521		}
522	| SITE SP CHMOD check_login SP octal_number SP pathname CRLF
523		{
524			if ($4 && ($8 != NULL)) {
525				if (($6 == -1) || ($6 > 0777))
526					reply(501,
527					    "CHMOD: Mode value must be between "
528					    "0 and 0777");
529				else if (!umaskchange)
530					reply(550,
531					    "No permission to change mode of %s.",
532					    $8);
533				else if (chmod($8, $6) < 0)
534					perror_reply(550, $8);
535				else
536					reply(200,
537					    "CHMOD command successful.");
538			}
539			if ($8 != NULL)
540				free($8);
541		}
542	| SITE SP check_login IDLE CRLF
543		{
544			if ($3)
545				reply(200,
546				    "Current IDLE time limit is %d "
547				    "seconds; max %d",
548				    timeout, maxtimeout);
549		}
550	| SITE SP check_login IDLE SP NUMBER CRLF
551		{
552			if ($3) {
553				if ($6 < 30 || $6 > maxtimeout) {
554					reply(501,
555					    "Maximum IDLE time must be between "
556					    "30 and %d seconds",
557					    maxtimeout);
558				} else {
559					timeout = $6;
560					(void) alarm((unsigned) timeout);
561					reply(200,
562					    "Maximum IDLE time set to %d seconds",
563					    timeout);
564				}
565			}
566		}
567	| STOU check_login SP pathname CRLF
568		{
569			if ($2 && $4 != NULL)
570				store($4, "w", 1);
571			if ($4 != NULL)
572				free($4);
573		}
574	| SYST check_login CRLF
575		{
576			if ($2)
577			reply(215, "UNIX Type: L8");
578		}
579
580		/*
581		 * SIZE is not in RFC959, but Postel has blessed it and
582		 * it will be in the updated RFC.
583		 *
584		 * Return size of file in a format suitable for
585		 * using with RESTART (we just count bytes).
586		 */
587	| SIZE check_login SP pathname CRLF
588		{
589			if ($2 && $4 != NULL)
590				sizecmd($4);
591			if ($4 != NULL)
592				free($4);
593		}
594
595		/*
596		 * MDTM is not in RFC959, but Postel has blessed it and
597		 * it will be in the updated RFC.
598		 *
599		 * Return modification time of file as an ISO 3307
600		 * style time. E.g. YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx
601		 * where xxx is the fractional second (of any precision,
602		 * not necessarily 3 digits)
603		 */
604	| MDTM check_login SP pathname CRLF
605		{
606			if ($2 && $4 != NULL) {
607				struct stat stbuf;
608				if (stat($4, &stbuf) < 0)
609					reply(550, "%s: %s",
610					    $4, strerror(errno));
611				else if (!S_ISREG(stbuf.st_mode)) {
612					reply(550, "%s: not a plain file.", $4);
613				} else {
614					struct tm *t;
615					t = gmtime(&stbuf.st_mtime);
616					reply(213,
617					    "%04d%02d%02d%02d%02d%02d",
618					    1900 + t->tm_year,
619					    t->tm_mon+1, t->tm_mday,
620					    t->tm_hour, t->tm_min, t->tm_sec);
621				}
622			}
623			if ($4 != NULL)
624				free($4);
625		}
626	| QUIT CRLF
627		{
628			reply(221, "Goodbye.");
629			dologout(0);
630		}
631	| error
632		{
633			yyclearin;		/* discard lookahead data */
634			yyerrok;		/* clear error condition */
635			state = 0;		/* reset lexer state */
636		}
637	;
638rcmd
639	: RNFR check_login SP pathname CRLF
640		{
641			restart_point = 0;
642			if ($2 && $4) {
643				if (fromname)
644					free(fromname);
645				fromname = renamefrom($4);
646				if (fromname == NULL)
647					free($4);
648			} else if ($4) {
649				free ($4);
650			}
651		}
652
653	| REST check_login SP file_size CRLF
654		{
655			if ($2) {
656				if (fromname) {
657					free(fromname);
658					fromname = NULL;
659				}
660				restart_point = $4;
661				reply(350, "Restarting at %lld. %s",
662				    (long long)restart_point,
663				    "Send STORE or RETRIEVE to initiate transfer.");
664			}
665		}
666	;
667
668username
669	: STRING
670	;
671
672password
673	: /* empty */
674		{
675			$$ = calloc(1, sizeof(char));
676		}
677	| STRING
678	;
679
680byte_size
681	: NUMBER
682	;
683
684file_size
685	: NUMBER
686		{
687			$$ = $1;
688		}
689	| BIGNUM
690		{
691			$$ = $1;
692		}
693	;
694
695host_port
696	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
697		NUMBER COMMA NUMBER
698		{
699			char *a, *p;
700
701			if ($1 < 0 || $1 > 255 || $3 < 0 || $3 > 255 ||
702			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
703			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255) {
704				$$ = 1;
705			} else {
706				data_dest.su_sin.sin_len = sizeof(struct sockaddr_in);
707				data_dest.su_sin.sin_family = AF_INET;
708				p = (char *)&data_dest.su_sin.sin_port;
709				p[0] = $9; p[1] = $11;
710				a = (char *)&data_dest.su_sin.sin_addr;
711				a[0] = $1; a[1] = $3; a[2] = $5; a[3] = $7;
712				$$ = 0;
713			}
714		}
715	;
716
717host_long_port4
718	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
719		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
720		NUMBER
721		{
722			char *a, *p;
723
724			/* reject invalid LPRT command */
725			if ($1 != 4 || $3 != 4 ||
726			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
727			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 ||
728			    $13 != 2 ||
729			    $15 < 0 || $15 > 255 || $17 < 0 || $17 > 255) {
730				$$ = 1;
731			} else {
732				data_dest.su_sin.sin_len =
733					sizeof(struct sockaddr_in);
734				data_dest.su_family = AF_INET;
735				p = (char *)&data_dest.su_port;
736				p[0] = $15; p[1] = $17;
737				a = (char *)&data_dest.su_sin.sin_addr;
738				a[0] = $5; a[1] = $7; a[2] = $9; a[3] = $11;
739				$$ = 0;
740			}
741		}
742	;
743
744host_long_port6
745	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
746		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
747		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
748		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
749		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
750		NUMBER
751		{
752			char *a, *p;
753
754			/* reject invalid LPRT command */
755			if ($1 != 6 || $3 != 16 ||
756			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
757			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 ||
758			    $13 < 0 || $13 > 255 || $15 < 0 || $15 > 255 ||
759			    $17 < 0 || $17 > 255 || $19 < 0 || $19 > 255 ||
760			    $21 < 0 || $21 > 255 || $23 < 0 || $23 > 255 ||
761			    $25 < 0 || $25 > 255 || $27 < 0 || $27 > 255 ||
762			    $29 < 0 || $29 > 255 || $31 < 0 || $31 > 255 ||
763			    $33 < 0 || $33 > 255 || $35 < 0 || $35 > 255 ||
764			    $37 != 2 ||
765			    $39 < 0 || $39 > 255 || $41 < 0 || $41 > 255) {
766				$$ = 1;
767			} else {
768				data_dest.su_sin6.sin6_len =
769					sizeof(struct sockaddr_in6);
770				data_dest.su_family = AF_INET6;
771				p = (char *)&data_dest.su_port;
772				p[0] = $39; p[1] = $41;
773				a = (char *)&data_dest.su_sin6.sin6_addr;
774				 a[0] =  $5;  a[1] =  $7;
775				 a[2] =  $9;  a[3] = $11;
776				 a[4] = $13;  a[5] = $15;
777				 a[6] = $17;  a[7] = $19;
778				 a[8] = $21;  a[9] = $23;
779				a[10] = $25; a[11] = $27;
780				a[12] = $29; a[13] = $31;
781				a[14] = $33; a[15] = $35;
782				if (his_addr.su_family == AF_INET6) {
783					/* XXX more sanity checks! */
784					data_dest.su_sin6.sin6_scope_id =
785					    his_addr.su_sin6.sin6_scope_id;
786				}
787
788				$$ = 0;
789			}
790		}
791	;
792
793form_code
794	: N
795		{
796			$$ = FORM_N;
797		}
798	| T
799		{
800			$$ = FORM_T;
801		}
802	| C
803		{
804			$$ = FORM_C;
805		}
806	;
807
808type_code
809	: A
810		{
811			cmd_type = TYPE_A;
812			cmd_form = FORM_N;
813		}
814	| A SP form_code
815		{
816			cmd_type = TYPE_A;
817			cmd_form = $3;
818		}
819	| E
820		{
821			cmd_type = TYPE_E;
822			cmd_form = FORM_N;
823		}
824	| E SP form_code
825		{
826			cmd_type = TYPE_E;
827			cmd_form = $3;
828		}
829	| I
830		{
831			cmd_type = TYPE_I;
832		}
833	| L
834		{
835			cmd_type = TYPE_L;
836			cmd_bytesz = 8;
837		}
838	| L SP byte_size
839		{
840			cmd_type = TYPE_L;
841			cmd_bytesz = $3;
842		}
843		/* this is for a bug in the BBN ftp */
844	| L byte_size
845		{
846			cmd_type = TYPE_L;
847			cmd_bytesz = $2;
848		}
849	;
850
851struct_code
852	: F
853		{
854			$$ = STRU_F;
855		}
856	| R
857		{
858			$$ = STRU_R;
859		}
860	| P
861		{
862			$$ = STRU_P;
863		}
864	;
865
866mode_code
867	: S
868		{
869			$$ = MODE_S;
870		}
871	| B
872		{
873			$$ = MODE_B;
874		}
875	| C
876		{
877			$$ = MODE_C;
878		}
879	;
880
881pathname
882	: pathstring
883		{
884			/*
885			 * Problem: this production is used for all pathname
886			 * processing, but only gives a 550 error reply.
887			 * This is a valid reply in some cases but not in others.
888			 */
889			if (logged_in && $1 && strchr($1, '~') != NULL) {
890				glob_t gl;
891				int flags =
892				 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
893				char *pptr = $1;
894
895				/*
896				 * glob() will only find a leading ~, but
897				 * Netscape kindly puts a slash in front of
898				 * it for publish URLs.  There needs to be
899				 * a flag for glob() that expands tildes
900				 * anywhere in the string.
901				 */
902				if ((pptr[0] == '/') && (pptr[1] == '~'))
903					pptr++;
904
905				memset(&gl, 0, sizeof(gl));
906				if (glob(pptr, flags, NULL, &gl) ||
907				    gl.gl_pathc == 0) {
908					reply(550, "not found");
909					$$ = NULL;
910				} else {
911					$$ = strdup(gl.gl_pathv[0]);
912				}
913				globfree(&gl);
914				free($1);
915			} else
916				$$ = $1;
917		}
918	;
919
920pathstring
921	: STRING
922	;
923
924octal_number
925	: NUMBER
926		{
927			int ret, dec, multby, digit;
928
929			/*
930			 * Convert a number that was read as decimal number
931			 * to what it would be if it had been read as octal.
932			 */
933			dec = $1;
934			multby = 1;
935			ret = 0;
936			while (dec) {
937				digit = dec%10;
938				if (digit > 7) {
939					ret = -1;
940					break;
941				}
942				ret += digit * multby;
943				multby *= 8;
944				dec /= 10;
945			}
946			$$ = ret;
947		}
948	;
949
950
951check_login
952	: /* empty */
953		{
954			if (logged_in)
955				$$ = 1;
956			else {
957				reply(530, "Please login with USER and PASS.");
958				$$ = 0;
959				state = 0;
960				YYABORT;
961			}
962		}
963	;
964
965check_login_epsvall
966	: /* empty */
967		{
968			if (!logged_in) {
969				reply(530, "Please login with USER and PASS.");
970				$$ = 0;
971				state = 0;
972				YYABORT;
973			} else if (epsvall) {
974				reply(501, "the command is disallowed "
975				    "after EPSV ALL");
976				usedefault = 1;
977				$$ = 0;
978			} else
979				$$ = 1;
980		}
981	;
982
983%%
984
985#define	CMD	0	/* beginning of command */
986#define	ARGS	1	/* expect miscellaneous arguments */
987#define	STR1	2	/* expect SP followed by STRING */
988#define	STR2	3	/* expect STRING */
989#define	OSTR	4	/* optional SP then STRING */
990#define	ZSTR1	5	/* SP then optional STRING */
991#define	ZSTR2	6	/* optional STRING after SP */
992#define	SITECMD	7	/* SITE command */
993#define	NSTR	8	/* Number followed by a string */
994
995struct tab {
996	char	*name;
997	short	token;
998	short	state;
999	short	implemented;	/* 1 if command is implemented */
1000	char	*help;
1001};
1002
1003struct tab cmdtab[] = {		/* In order defined in RFC 765 */
1004	{ "USER", USER, STR1, 1,	"<sp> username" },
1005	{ "PASS", PASS, ZSTR1, 1,	"<sp> password" },
1006	{ "ACCT", ACCT, STR1, 0,	"(specify account)" },
1007	{ "SMNT", SMNT, ARGS, 0,	"(structure mount)" },
1008	{ "REIN", REIN, ARGS, 0,	"(reinitialize server state)" },
1009	{ "QUIT", QUIT, ARGS, 1,	"(terminate service)", },
1010	{ "PORT", PORT, ARGS, 1,	"<sp> b0, b1, b2, b3, b4" },
1011	{ "LPRT", LPRT, ARGS, 1,	"<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." },
1012	{ "EPRT", EPRT, STR1, 1,	"<sp> |af|addr|port|" },
1013	{ "PASV", PASV, ARGS, 1,	"(set server in passive mode)" },
1014	{ "LPSV", LPSV, ARGS, 1,	"(set server in passive mode)" },
1015	{ "EPSV", EPSV, ARGS, 1,	"[<sp> af|ALL]" },
1016	{ "TYPE", TYPE, ARGS, 1,	"<sp> [ A | E | I | L ]" },
1017	{ "STRU", STRU, ARGS, 1,	"(specify file structure)" },
1018	{ "MODE", MODE, ARGS, 1,	"(specify transfer mode)" },
1019	{ "RETR", RETR, STR1, 1,	"<sp> file-name" },
1020	{ "STOR", STOR, STR1, 1,	"<sp> file-name" },
1021	{ "APPE", APPE, STR1, 1,	"<sp> file-name" },
1022	{ "MLFL", MLFL, OSTR, 0,	"(mail file)" },
1023	{ "MAIL", MAIL, OSTR, 0,	"(mail to user)" },
1024	{ "MSND", MSND, OSTR, 0,	"(mail send to terminal)" },
1025	{ "MSOM", MSOM, OSTR, 0,	"(mail send to terminal or mailbox)" },
1026	{ "MSAM", MSAM, OSTR, 0,	"(mail send to terminal and mailbox)" },
1027	{ "MRSQ", MRSQ, OSTR, 0,	"(mail recipient scheme question)" },
1028	{ "MRCP", MRCP, STR1, 0,	"(mail recipient)" },
1029	{ "ALLO", ALLO, ARGS, 1,	"allocate storage (vacuously)" },
1030	{ "REST", REST, ARGS, 1,	"<sp> offset (restart command)" },
1031	{ "RNFR", RNFR, STR1, 1,	"<sp> file-name" },
1032	{ "RNTO", RNTO, STR1, 1,	"<sp> file-name" },
1033	{ "ABOR", ABOR, ARGS, 1,	"(abort operation)" },
1034	{ "DELE", DELE, STR1, 1,	"<sp> file-name" },
1035	{ "CWD",  CWD,  OSTR, 1,	"[ <sp> directory-name ]" },
1036	{ "XCWD", CWD,	OSTR, 1,	"[ <sp> directory-name ]" },
1037	{ "LIST", LIST, OSTR, 1,	"[ <sp> path-name ]" },
1038	{ "NLST", NLST, OSTR, 1,	"[ <sp> path-name ]" },
1039	{ "SITE", SITE, SITECMD, 1,	"site-cmd [ <sp> arguments ]" },
1040	{ "SYST", SYST, ARGS, 1,	"(get type of operating system)" },
1041	{ "STAT", STAT, OSTR, 1,	"[ <sp> path-name ]" },
1042	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
1043	{ "NOOP", NOOP, ARGS, 1,	"" },
1044	{ "MKD",  MKD,  STR1, 1,	"<sp> path-name" },
1045	{ "XMKD", MKD,  STR1, 1,	"<sp> path-name" },
1046	{ "RMD",  RMD,  STR1, 1,	"<sp> path-name" },
1047	{ "XRMD", RMD,  STR1, 1,	"<sp> path-name" },
1048	{ "PWD",  PWD,  ARGS, 1,	"(return current directory)" },
1049	{ "XPWD", PWD,  ARGS, 1,	"(return current directory)" },
1050	{ "CDUP", CDUP, ARGS, 1,	"(change to parent directory)" },
1051	{ "XCUP", CDUP, ARGS, 1,	"(change to parent directory)" },
1052	{ "STOU", STOU, STR1, 1,	"<sp> file-name" },
1053	{ "SIZE", SIZE, OSTR, 1,	"<sp> path-name" },
1054	{ "MDTM", MDTM, OSTR, 1,	"<sp> path-name" },
1055	{ NULL,   0,    0,    0,	0 }
1056};
1057
1058struct tab sitetab[] = {
1059	{ "UMASK", UMASK, ARGS, 1,	"[ <sp> umask ]" },
1060	{ "IDLE", IDLE, ARGS, 1,	"[ <sp> maximum-idle-time ]" },
1061	{ "CHMOD", CHMOD, NSTR, 1,	"<sp> mode <sp> file-name" },
1062	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
1063	{ NULL,   0,    0,    0,	0 }
1064};
1065
1066static void	 help(struct tab *, char *);
1067static struct tab *
1068		 lookup(struct tab *, char *);
1069static void	 sizecmd(char *);
1070static int	 yylex(void);
1071
1072extern int epsvall;
1073
1074static struct tab *
1075lookup(p, cmd)
1076	struct tab *p;
1077	char *cmd;
1078{
1079
1080	for (; p->name != NULL; p++)
1081		if (strcmp(cmd, p->name) == 0)
1082			return (p);
1083	return (NULL);
1084}
1085
1086#include <arpa/telnet.h>
1087
1088/*
1089 * get_line - a hacked up version of fgets to ignore TELNET escape codes.
1090 */
1091int
1092get_line(s, n, iop)
1093	char *s;
1094	int n;
1095	FILE *iop;
1096{
1097	int c;
1098	char *cs;
1099
1100	cs = s;
1101/* tmpline may contain saved command from urgent mode interruption */
1102	for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) {
1103		*cs++ = tmpline[c];
1104		if (tmpline[c] == '\n') {
1105			*cs++ = '\0';
1106			if (debug)
1107				syslog(LOG_DEBUG, "command: %s", s);
1108			tmpline[0] = '\0';
1109			return(0);
1110		}
1111		if (c == 0)
1112			tmpline[0] = '\0';
1113	}
1114	while ((c = getc(iop)) != EOF) {
1115		c &= 0377;
1116		if (c == IAC) {
1117		    if ((c = getc(iop)) != EOF) {
1118			c &= 0377;
1119			switch (c) {
1120			case WILL:
1121			case WONT:
1122				c = getc(iop);
1123				printf("%c%c%c", IAC, DONT, 0377&c);
1124				(void) fflush(stdout);
1125				continue;
1126			case DO:
1127			case DONT:
1128				c = getc(iop);
1129				printf("%c%c%c", IAC, WONT, 0377&c);
1130				(void) fflush(stdout);
1131				continue;
1132			case IAC:
1133				break;
1134			default:
1135				continue;	/* ignore command */
1136			}
1137		    }
1138		}
1139		*cs++ = c;
1140		if (--n <= 0) {
1141			/*
1142			 * If command doesn't fit into buffer, discard the
1143			 * rest of the command and indicate truncation.
1144			 * This prevents the command to be split up into
1145			 * multiple commands.
1146			 */
1147			while (c != '\n' && (c = getc(iop)) != EOF)
1148				;
1149			return (-2);
1150		}
1151		if (c == '\n')
1152			break;
1153	}
1154	if (c == EOF && cs == s)
1155		return (-1);
1156	*cs++ = '\0';
1157	if (debug) {
1158		if (!guest && strncasecmp("pass ", s, 5) == 0) {
1159			/* Don't syslog passwords */
1160			syslog(LOG_DEBUG, "command: %.5s ???", s);
1161		} else {
1162			char *cp;
1163			int len;
1164
1165			/* Don't syslog trailing CR-LF */
1166			len = strlen(s);
1167			cp = s + len - 1;
1168			while (cp >= s && (*cp == '\n' || *cp == '\r')) {
1169				--cp;
1170				--len;
1171			}
1172			syslog(LOG_DEBUG, "command: %.*s", len, s);
1173		}
1174	}
1175	return (0);
1176}
1177
1178/*ARGSUSED*/
1179void
1180toolong(signo)
1181	int signo;
1182{
1183	struct syslog_data sdata = SYSLOG_DATA_INIT;
1184
1185	reply_r(421,
1186	    "Timeout (%d seconds): closing control connection.", timeout);
1187	if (logging)
1188		syslog_r(LOG_INFO, &sdata, "User %s timed out after %d seconds",
1189		    (pw ? pw -> pw_name : "unknown"), timeout);
1190	dologout(1);
1191}
1192
1193static int
1194yylex()
1195{
1196	static int cpos;
1197	char *cp, *cp2;
1198	struct tab *p;
1199	int n;
1200	char c;
1201
1202	for (;;) {
1203		switch (state) {
1204
1205		case CMD:
1206			(void) alarm((unsigned) timeout);
1207			n = get_line(cbuf, sizeof(cbuf)-1, stdin);
1208			if (n == -1) {
1209				reply(221, "You could at least say goodbye.");
1210				dologout(0);
1211			} else if (n == -2) {
1212				reply(500, "Command too long.");
1213				alarm(0);
1214				continue;
1215			}
1216			(void) alarm(0);
1217			if ((cp = strchr(cbuf, '\r'))) {
1218				*cp++ = '\n';
1219				*cp = '\0';
1220			}
1221			if (strncasecmp(cbuf, "PASS", 4) != 0) {
1222				if ((cp = strpbrk(cbuf, "\n"))) {
1223					c = *cp;
1224					*cp = '\0';
1225					setproctitle("%s: %s", proctitle, cbuf);
1226					*cp = c;
1227				}
1228			}
1229			if ((cp = strpbrk(cbuf, " \n")))
1230				cpos = cp - cbuf;
1231			if (cpos == 0)
1232				cpos = 4;
1233			c = cbuf[cpos];
1234			cbuf[cpos] = '\0';
1235			upper(cbuf);
1236			p = lookup(cmdtab, cbuf);
1237			cbuf[cpos] = c;
1238			if (p != NULL) {
1239				if (p->implemented == 0) {
1240					nack(p->name);
1241					return (LEXERR);
1242				}
1243				state = p->state;
1244				yylval.s = p->name;
1245				return (p->token);
1246			}
1247			break;
1248
1249		case SITECMD:
1250			if (cbuf[cpos] == ' ') {
1251				cpos++;
1252				return (SP);
1253			}
1254			cp = &cbuf[cpos];
1255			if ((cp2 = strpbrk(cp, " \n")))
1256				cpos = cp2 - cbuf;
1257			c = cbuf[cpos];
1258			cbuf[cpos] = '\0';
1259			upper(cp);
1260			p = lookup(sitetab, cp);
1261			cbuf[cpos] = c;
1262			if (p != NULL) {
1263				if (p->implemented == 0) {
1264					state = CMD;
1265					nack(p->name);
1266					return (LEXERR);
1267				}
1268				state = p->state;
1269				yylval.s = p->name;
1270				return (p->token);
1271			}
1272			state = CMD;
1273			break;
1274
1275		case OSTR:
1276			if (cbuf[cpos] == '\n') {
1277				state = CMD;
1278				return (CRLF);
1279			}
1280			/* FALLTHROUGH */
1281
1282		case STR1:
1283		case ZSTR1:
1284		dostr1:
1285			if (cbuf[cpos] == ' ') {
1286				cpos++;
1287				state = state == OSTR ? STR2 : state+1;
1288				return (SP);
1289			}
1290			break;
1291
1292		case ZSTR2:
1293			if (cbuf[cpos] == '\n') {
1294				state = CMD;
1295				return (CRLF);
1296			}
1297			/* FALLTHROUGH */
1298
1299		case STR2:
1300			cp = &cbuf[cpos];
1301			n = strlen(cp);
1302			cpos += n - 1;
1303			/*
1304			 * Make sure the string is nonempty and \n terminated.
1305			 */
1306			if (n > 1 && cbuf[cpos] == '\n') {
1307				cbuf[cpos] = '\0';
1308				yylval.s = strdup(cp);
1309				if (yylval.s == NULL)
1310					fatal("Ran out of memory.");
1311				cbuf[cpos] = '\n';
1312				state = ARGS;
1313				return (STRING);
1314			}
1315			break;
1316
1317		case NSTR:
1318			if (cbuf[cpos] == ' ') {
1319				cpos++;
1320				return (SP);
1321			}
1322			if (isdigit((unsigned char)cbuf[cpos])) {
1323				cp = &cbuf[cpos];
1324				while (isdigit((unsigned char)cbuf[++cpos]))
1325					;
1326				c = cbuf[cpos];
1327				cbuf[cpos] = '\0';
1328				yylval.i = atoi(cp);
1329				cbuf[cpos] = c;
1330				state = STR1;
1331				return (NUMBER);
1332			}
1333			state = STR1;
1334			goto dostr1;
1335
1336		case ARGS:
1337			if (isdigit((unsigned char)cbuf[cpos])) {
1338				long long llval;
1339
1340				cp = &cbuf[cpos];
1341				errno = 0;
1342				llval = strtoll(cp, &cp2, 10);
1343				if (llval < 0 ||
1344				    (errno == ERANGE && llval == LLONG_MAX))
1345					break;
1346
1347				cpos = (int)(cp2 - cbuf);
1348				if (llval > INT_MAX) {
1349					yylval.o = llval;
1350					return (BIGNUM);
1351				} else {
1352					yylval.i = (int)llval;
1353					return (NUMBER);
1354				}
1355			}
1356			if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 &&
1357			    !isalnum((unsigned char)cbuf[cpos + 3])) {
1358				cpos += 3;
1359				return ALL;
1360			}
1361			switch (cbuf[cpos++]) {
1362
1363			case '\n':
1364				state = CMD;
1365				return (CRLF);
1366
1367			case ' ':
1368				return (SP);
1369
1370			case ',':
1371				return (COMMA);
1372
1373			case 'A':
1374			case 'a':
1375				return (A);
1376
1377			case 'B':
1378			case 'b':
1379				return (B);
1380
1381			case 'C':
1382			case 'c':
1383				return (C);
1384
1385			case 'E':
1386			case 'e':
1387				return (E);
1388
1389			case 'F':
1390			case 'f':
1391				return (F);
1392
1393			case 'I':
1394			case 'i':
1395				return (I);
1396
1397			case 'L':
1398			case 'l':
1399				return (L);
1400
1401			case 'N':
1402			case 'n':
1403				return (N);
1404
1405			case 'P':
1406			case 'p':
1407				return (P);
1408
1409			case 'R':
1410			case 'r':
1411				return (R);
1412
1413			case 'S':
1414			case 's':
1415				return (S);
1416
1417			case 'T':
1418			case 't':
1419				return (T);
1420
1421			}
1422			break;
1423
1424		default:
1425			fatal("Unknown state in scanner.");
1426		}
1427		state = CMD;
1428		return (LEXERR);
1429	}
1430}
1431
1432void
1433upper(s)
1434	char *s;
1435{
1436	char *p;
1437
1438	for (p = s; *p; p++) {
1439		if (islower((unsigned char)*p))
1440			*p = (char)toupper((unsigned char)*p);
1441	}
1442}
1443
1444static void
1445help(ctab, s)
1446	struct tab *ctab;
1447	char *s;
1448{
1449	struct tab *c;
1450	int width, NCMDS;
1451	char *type;
1452
1453	if (ctab == sitetab)
1454		type = "SITE ";
1455	else
1456		type = "";
1457	width = 0, NCMDS = 0;
1458	for (c = ctab; c->name != NULL; c++) {
1459		int len = strlen(c->name);
1460
1461		if (len > width)
1462			width = len;
1463		NCMDS++;
1464	}
1465	width = (width + 8) &~ 7;
1466	if (s == NULL) {
1467		int i, j, w;
1468		int columns, lines;
1469
1470		lreply(214, "The following %scommands are recognized %s.",
1471		    type, "(* =>'s unimplemented)");
1472		columns = 76 / width;
1473		if (columns == 0)
1474			columns = 1;
1475		lines = (NCMDS + columns - 1) / columns;
1476		for (i = 0; i < lines; i++) {
1477			printf("   ");
1478			for (j = 0; j < columns; j++) {
1479				c = ctab + j * lines + i;
1480				printf("%s%c", c->name,
1481					c->implemented ? ' ' : '*');
1482				if (c + lines >= &ctab[NCMDS])
1483					break;
1484				w = strlen(c->name) + 1;
1485				while (w < width) {
1486					putchar(' ');
1487					w++;
1488				}
1489			}
1490			printf("\r\n");
1491		}
1492		(void) fflush(stdout);
1493		reply(214, "Direct comments to ftp-bugs@%s.", hostname);
1494		return;
1495	}
1496	upper(s);
1497	c = lookup(ctab, s);
1498	if (c == NULL) {
1499		reply(502, "Unknown command %s.", s);
1500		return;
1501	}
1502	if (c->implemented)
1503		reply(214, "Syntax: %s%s %s", type, c->name, c->help);
1504	else
1505		reply(214, "%s%-*s\t%s; unimplemented.", type, width,
1506		    c->name, c->help);
1507}
1508
1509static void
1510sizecmd(filename)
1511	char *filename;
1512{
1513	switch (type) {
1514	case TYPE_L:
1515	case TYPE_I: {
1516		struct stat stbuf;
1517		if (stat(filename, &stbuf) < 0 || !S_ISREG(stbuf.st_mode))
1518			reply(550, "%s: not a plain file.", filename);
1519		else
1520			reply(213, "%lld", (long long)stbuf.st_size);
1521		break; }
1522	case TYPE_A: {
1523		FILE *fin;
1524		int c;
1525		off_t count;
1526		struct stat stbuf;
1527		fin = fopen(filename, "r");
1528		if (fin == NULL) {
1529			perror_reply(550, filename);
1530			return;
1531		}
1532		if (fstat(fileno(fin), &stbuf) < 0 || !S_ISREG(stbuf.st_mode)) {
1533			reply(550, "%s: not a plain file.", filename);
1534			(void) fclose(fin);
1535			return;
1536		}
1537		if (stbuf.st_size > 10240) {
1538			reply(550, "%s: file too large for SIZE.", filename);
1539			(void) fclose(fin);
1540			return;
1541		}
1542
1543		count = 0;
1544		while((c = getc(fin)) != EOF) {
1545			if (c == '\n')	/* will get expanded to \r\n */
1546				count++;
1547			count++;
1548		}
1549		(void) fclose(fin);
1550
1551		reply(213, "%lld", (long long)count);
1552		break; }
1553	default:
1554		reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]);
1555	}
1556}
1557