ftpcmd.y revision 1.65 
1/*	$OpenBSD: ftpcmd.y,v 1.65 2017/04/17 21:49:01 deraadt 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(NULL, $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("/bin/ls -lgA", "");
378		}
379	| LIST check_login SP pathname CRLF
380		{
381			if ($2 && $4 != NULL)
382				retrieve("/bin/ls -lgA %s", $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			}
960		}
961	;
962
963check_login_epsvall
964	: /* empty */
965		{
966			if (!logged_in) {
967				reply(530, "Please login with USER and PASS.");
968				$$ = 0;
969			} else if (epsvall) {
970				reply(501, "the command is disallowed "
971				    "after EPSV ALL");
972				usedefault = 1;
973				$$ = 0;
974			} else
975				$$ = 1;
976		}
977	;
978
979%%
980
981#define	CMD	0	/* beginning of command */
982#define	ARGS	1	/* expect miscellaneous arguments */
983#define	STR1	2	/* expect SP followed by STRING */
984#define	STR2	3	/* expect STRING */
985#define	OSTR	4	/* optional SP then STRING */
986#define	ZSTR1	5	/* SP then optional STRING */
987#define	ZSTR2	6	/* optional STRING after SP */
988#define	SITECMD	7	/* SITE command */
989#define	NSTR	8	/* Number followed by a string */
990
991struct tab {
992	char	*name;
993	short	token;
994	short	state;
995	short	implemented;	/* 1 if command is implemented */
996	char	*help;
997};
998
999struct tab cmdtab[] = {		/* In order defined in RFC 765 */
1000	{ "USER", USER, STR1, 1,	"<sp> username" },
1001	{ "PASS", PASS, ZSTR1, 1,	"<sp> password" },
1002	{ "ACCT", ACCT, STR1, 0,	"(specify account)" },
1003	{ "SMNT", SMNT, ARGS, 0,	"(structure mount)" },
1004	{ "REIN", REIN, ARGS, 0,	"(reinitialize server state)" },
1005	{ "QUIT", QUIT, ARGS, 1,	"(terminate service)", },
1006	{ "PORT", PORT, ARGS, 1,	"<sp> b0, b1, b2, b3, b4" },
1007	{ "LPRT", LPRT, ARGS, 1,	"<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." },
1008	{ "EPRT", EPRT, STR1, 1,	"<sp> |af|addr|port|" },
1009	{ "PASV", PASV, ARGS, 1,	"(set server in passive mode)" },
1010	{ "LPSV", LPSV, ARGS, 1,	"(set server in passive mode)" },
1011	{ "EPSV", EPSV, ARGS, 1,	"[<sp> af|ALL]" },
1012	{ "TYPE", TYPE, ARGS, 1,	"<sp> [ A | E | I | L ]" },
1013	{ "STRU", STRU, ARGS, 1,	"(specify file structure)" },
1014	{ "MODE", MODE, ARGS, 1,	"(specify transfer mode)" },
1015	{ "RETR", RETR, STR1, 1,	"<sp> file-name" },
1016	{ "STOR", STOR, STR1, 1,	"<sp> file-name" },
1017	{ "APPE", APPE, STR1, 1,	"<sp> file-name" },
1018	{ "MLFL", MLFL, OSTR, 0,	"(mail file)" },
1019	{ "MAIL", MAIL, OSTR, 0,	"(mail to user)" },
1020	{ "MSND", MSND, OSTR, 0,	"(mail send to terminal)" },
1021	{ "MSOM", MSOM, OSTR, 0,	"(mail send to terminal or mailbox)" },
1022	{ "MSAM", MSAM, OSTR, 0,	"(mail send to terminal and mailbox)" },
1023	{ "MRSQ", MRSQ, OSTR, 0,	"(mail recipient scheme question)" },
1024	{ "MRCP", MRCP, STR1, 0,	"(mail recipient)" },
1025	{ "ALLO", ALLO, ARGS, 1,	"allocate storage (vacuously)" },
1026	{ "REST", REST, ARGS, 1,	"<sp> offset (restart command)" },
1027	{ "RNFR", RNFR, STR1, 1,	"<sp> file-name" },
1028	{ "RNTO", RNTO, STR1, 1,	"<sp> file-name" },
1029	{ "ABOR", ABOR, ARGS, 1,	"(abort operation)" },
1030	{ "DELE", DELE, STR1, 1,	"<sp> file-name" },
1031	{ "CWD",  CWD,  OSTR, 1,	"[ <sp> directory-name ]" },
1032	{ "XCWD", CWD,	OSTR, 1,	"[ <sp> directory-name ]" },
1033	{ "LIST", LIST, OSTR, 1,	"[ <sp> path-name ]" },
1034	{ "NLST", NLST, OSTR, 1,	"[ <sp> path-name ]" },
1035	{ "SITE", SITE, SITECMD, 1,	"site-cmd [ <sp> arguments ]" },
1036	{ "SYST", SYST, ARGS, 1,	"(get type of operating system)" },
1037	{ "STAT", STAT, OSTR, 1,	"[ <sp> path-name ]" },
1038	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
1039	{ "NOOP", NOOP, ARGS, 1,	"" },
1040	{ "MKD",  MKD,  STR1, 1,	"<sp> path-name" },
1041	{ "XMKD", MKD,  STR1, 1,	"<sp> path-name" },
1042	{ "RMD",  RMD,  STR1, 1,	"<sp> path-name" },
1043	{ "XRMD", RMD,  STR1, 1,	"<sp> path-name" },
1044	{ "PWD",  PWD,  ARGS, 1,	"(return current directory)" },
1045	{ "XPWD", PWD,  ARGS, 1,	"(return current directory)" },
1046	{ "CDUP", CDUP, ARGS, 1,	"(change to parent directory)" },
1047	{ "XCUP", CDUP, ARGS, 1,	"(change to parent directory)" },
1048	{ "STOU", STOU, STR1, 1,	"<sp> file-name" },
1049	{ "SIZE", SIZE, OSTR, 1,	"<sp> path-name" },
1050	{ "MDTM", MDTM, OSTR, 1,	"<sp> path-name" },
1051	{ NULL,   0,    0,    0,	0 }
1052};
1053
1054struct tab sitetab[] = {
1055	{ "UMASK", UMASK, ARGS, 1,	"[ <sp> umask ]" },
1056	{ "IDLE", IDLE, ARGS, 1,	"[ <sp> maximum-idle-time ]" },
1057	{ "CHMOD", CHMOD, NSTR, 1,	"<sp> mode <sp> file-name" },
1058	{ "HELP", HELP, OSTR, 1,	"[ <sp> <string> ]" },
1059	{ NULL,   0,    0,    0,	0 }
1060};
1061
1062static void	 help(struct tab *, char *);
1063static struct tab *
1064		 lookup(struct tab *, char *);
1065static void	 sizecmd(char *);
1066static int	 yylex(void);
1067
1068extern int epsvall;
1069
1070static struct tab *
1071lookup(p, cmd)
1072	struct tab *p;
1073	char *cmd;
1074{
1075
1076	for (; p->name != NULL; p++)
1077		if (strcmp(cmd, p->name) == 0)
1078			return (p);
1079	return (NULL);
1080}
1081
1082#include <arpa/telnet.h>
1083
1084/*
1085 * get_line - a hacked up version of fgets to ignore TELNET escape codes.
1086 */
1087int
1088get_line(s, n, iop)
1089	char *s;
1090	int n;
1091	FILE *iop;
1092{
1093	int c;
1094	char *cs;
1095
1096	cs = s;
1097/* tmpline may contain saved command from urgent mode interruption */
1098	for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) {
1099		*cs++ = tmpline[c];
1100		if (tmpline[c] == '\n') {
1101			*cs++ = '\0';
1102			if (debug)
1103				syslog(LOG_DEBUG, "command: %s", s);
1104			tmpline[0] = '\0';
1105			return(0);
1106		}
1107		if (c == 0)
1108			tmpline[0] = '\0';
1109	}
1110	while ((c = getc(iop)) != EOF) {
1111		c &= 0377;
1112		if (c == IAC) {
1113		    if ((c = getc(iop)) != EOF) {
1114			c &= 0377;
1115			switch (c) {
1116			case WILL:
1117			case WONT:
1118				c = getc(iop);
1119				printf("%c%c%c", IAC, DONT, 0377&c);
1120				(void) fflush(stdout);
1121				continue;
1122			case DO:
1123			case DONT:
1124				c = getc(iop);
1125				printf("%c%c%c", IAC, WONT, 0377&c);
1126				(void) fflush(stdout);
1127				continue;
1128			case IAC:
1129				break;
1130			default:
1131				continue;	/* ignore command */
1132			}
1133		    }
1134		}
1135		*cs++ = c;
1136		if (--n <= 0) {
1137			/*
1138			 * If command doesn't fit into buffer, discard the
1139			 * rest of the command and indicate truncation.
1140			 * This prevents the command to be split up into
1141			 * multiple commands.
1142			 */
1143			while (c != '\n' && (c = getc(iop)) != EOF)
1144				;
1145			return (-2);
1146		}
1147		if (c == '\n')
1148			break;
1149	}
1150	if (c == EOF && cs == s)
1151		return (-1);
1152	*cs++ = '\0';
1153	if (debug) {
1154		if (!guest && strncasecmp("pass ", s, 5) == 0) {
1155			/* Don't syslog passwords */
1156			syslog(LOG_DEBUG, "command: %.5s ???", s);
1157		} else {
1158			char *cp;
1159			int len;
1160
1161			/* Don't syslog trailing CR-LF */
1162			len = strlen(s);
1163			cp = s + len - 1;
1164			while (cp >= s && (*cp == '\n' || *cp == '\r')) {
1165				--cp;
1166				--len;
1167			}
1168			syslog(LOG_DEBUG, "command: %.*s", len, s);
1169		}
1170	}
1171	return (0);
1172}
1173
1174/*ARGSUSED*/
1175void
1176toolong(signo)
1177	int signo;
1178{
1179	struct syslog_data sdata = SYSLOG_DATA_INIT;
1180
1181	reply_r(421,
1182	    "Timeout (%d seconds): closing control connection.", timeout);
1183	if (logging)
1184		syslog_r(LOG_INFO, &sdata, "User %s timed out after %d seconds",
1185		    (pw ? pw -> pw_name : "unknown"), timeout);
1186	dologout(1);
1187}
1188
1189static int
1190yylex()
1191{
1192	static int cpos;
1193	char *cp, *cp2;
1194	struct tab *p;
1195	int n;
1196	char c;
1197
1198	for (;;) {
1199		switch (state) {
1200
1201		case CMD:
1202			(void) alarm((unsigned) timeout);
1203			n = get_line(cbuf, sizeof(cbuf)-1, stdin);
1204			if (n == -1) {
1205				reply(221, "You could at least say goodbye.");
1206				dologout(0);
1207			} else if (n == -2) {
1208				reply(500, "Command too long.");
1209				alarm(0);
1210				continue;
1211			}
1212			(void) alarm(0);
1213			if ((cp = strchr(cbuf, '\r'))) {
1214				*cp++ = '\n';
1215				*cp = '\0';
1216			}
1217			if (strncasecmp(cbuf, "PASS", 4) != 0) {
1218				if ((cp = strpbrk(cbuf, "\n"))) {
1219					c = *cp;
1220					*cp = '\0';
1221					setproctitle("%s: %s", proctitle, cbuf);
1222					*cp = c;
1223				}
1224			}
1225			if ((cp = strpbrk(cbuf, " \n")))
1226				cpos = cp - cbuf;
1227			if (cpos == 0)
1228				cpos = 4;
1229			c = cbuf[cpos];
1230			cbuf[cpos] = '\0';
1231			upper(cbuf);
1232			p = lookup(cmdtab, cbuf);
1233			cbuf[cpos] = c;
1234			if (p != NULL) {
1235				if (p->implemented == 0) {
1236					nack(p->name);
1237					return (LEXERR);
1238				}
1239				state = p->state;
1240				yylval.s = p->name;
1241				return (p->token);
1242			}
1243			break;
1244
1245		case SITECMD:
1246			if (cbuf[cpos] == ' ') {
1247				cpos++;
1248				return (SP);
1249			}
1250			cp = &cbuf[cpos];
1251			if ((cp2 = strpbrk(cp, " \n")))
1252				cpos = cp2 - cbuf;
1253			c = cbuf[cpos];
1254			cbuf[cpos] = '\0';
1255			upper(cp);
1256			p = lookup(sitetab, cp);
1257			cbuf[cpos] = c;
1258			if (p != NULL) {
1259				if (p->implemented == 0) {
1260					state = CMD;
1261					nack(p->name);
1262					return (LEXERR);
1263				}
1264				state = p->state;
1265				yylval.s = p->name;
1266				return (p->token);
1267			}
1268			state = CMD;
1269			break;
1270
1271		case OSTR:
1272			if (cbuf[cpos] == '\n') {
1273				state = CMD;
1274				return (CRLF);
1275			}
1276			/* FALLTHROUGH */
1277
1278		case STR1:
1279		case ZSTR1:
1280		dostr1:
1281			if (cbuf[cpos] == ' ') {
1282				cpos++;
1283				state = state == OSTR ? STR2 : state+1;
1284				return (SP);
1285			}
1286			break;
1287
1288		case ZSTR2:
1289			if (cbuf[cpos] == '\n') {
1290				state = CMD;
1291				return (CRLF);
1292			}
1293			/* FALLTHROUGH */
1294
1295		case STR2:
1296			cp = &cbuf[cpos];
1297			n = strlen(cp);
1298			cpos += n - 1;
1299			/*
1300			 * Make sure the string is nonempty and \n terminated.
1301			 */
1302			if (n > 1 && cbuf[cpos] == '\n') {
1303				cbuf[cpos] = '\0';
1304				yylval.s = strdup(cp);
1305				if (yylval.s == NULL)
1306					fatal("Ran out of memory.");
1307				cbuf[cpos] = '\n';
1308				state = ARGS;
1309				return (STRING);
1310			}
1311			break;
1312
1313		case NSTR:
1314			if (cbuf[cpos] == ' ') {
1315				cpos++;
1316				return (SP);
1317			}
1318			if (isdigit((unsigned char)cbuf[cpos])) {
1319				cp = &cbuf[cpos];
1320				while (isdigit((unsigned char)cbuf[++cpos]))
1321					;
1322				c = cbuf[cpos];
1323				cbuf[cpos] = '\0';
1324				yylval.i = atoi(cp);
1325				cbuf[cpos] = c;
1326				state = STR1;
1327				return (NUMBER);
1328			}
1329			state = STR1;
1330			goto dostr1;
1331
1332		case ARGS:
1333			if (isdigit((unsigned char)cbuf[cpos])) {
1334				long long llval;
1335
1336				cp = &cbuf[cpos];
1337				errno = 0;
1338				llval = strtoll(cp, &cp2, 10);
1339				if (llval < 0 ||
1340				    (errno == ERANGE && llval == LLONG_MAX))
1341					break;
1342
1343				cpos = (int)(cp2 - cbuf);
1344				if (llval > INT_MAX) {
1345					yylval.o = llval;
1346					return (BIGNUM);
1347				} else {
1348					yylval.i = (int)llval;
1349					return (NUMBER);
1350				}
1351			}
1352			if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 &&
1353			    !isalnum((unsigned char)cbuf[cpos + 3])) {
1354				cpos += 3;
1355				return ALL;
1356			}
1357			switch (cbuf[cpos++]) {
1358
1359			case '\n':
1360				state = CMD;
1361				return (CRLF);
1362
1363			case ' ':
1364				return (SP);
1365
1366			case ',':
1367				return (COMMA);
1368
1369			case 'A':
1370			case 'a':
1371				return (A);
1372
1373			case 'B':
1374			case 'b':
1375				return (B);
1376
1377			case 'C':
1378			case 'c':
1379				return (C);
1380
1381			case 'E':
1382			case 'e':
1383				return (E);
1384
1385			case 'F':
1386			case 'f':
1387				return (F);
1388
1389			case 'I':
1390			case 'i':
1391				return (I);
1392
1393			case 'L':
1394			case 'l':
1395				return (L);
1396
1397			case 'N':
1398			case 'n':
1399				return (N);
1400
1401			case 'P':
1402			case 'p':
1403				return (P);
1404
1405			case 'R':
1406			case 'r':
1407				return (R);
1408
1409			case 'S':
1410			case 's':
1411				return (S);
1412
1413			case 'T':
1414			case 't':
1415				return (T);
1416
1417			}
1418			break;
1419
1420		default:
1421			fatal("Unknown state in scanner.");
1422		}
1423		state = CMD;
1424		return (LEXERR);
1425	}
1426}
1427
1428void
1429upper(s)
1430	char *s;
1431{
1432	char *p;
1433
1434	for (p = s; *p; p++) {
1435		if (islower((unsigned char)*p))
1436			*p = (char)toupper((unsigned char)*p);
1437	}
1438}
1439
1440static void
1441help(ctab, s)
1442	struct tab *ctab;
1443	char *s;
1444{
1445	struct tab *c;
1446	int width, NCMDS;
1447	char *type;
1448
1449	if (ctab == sitetab)
1450		type = "SITE ";
1451	else
1452		type = "";
1453	width = 0, NCMDS = 0;
1454	for (c = ctab; c->name != NULL; c++) {
1455		int len = strlen(c->name);
1456
1457		if (len > width)
1458			width = len;
1459		NCMDS++;
1460	}
1461	width = (width + 8) &~ 7;
1462	if (s == NULL) {
1463		int i, j, w;
1464		int columns, lines;
1465
1466		lreply(214, "The following %scommands are recognized %s.",
1467		    type, "(* =>'s unimplemented)");
1468		columns = 76 / width;
1469		if (columns == 0)
1470			columns = 1;
1471		lines = (NCMDS + columns - 1) / columns;
1472		for (i = 0; i < lines; i++) {
1473			printf("   ");
1474			for (j = 0; j < columns; j++) {
1475				c = ctab + j * lines + i;
1476				printf("%s%c", c->name,
1477					c->implemented ? ' ' : '*');
1478				if (c + lines >= &ctab[NCMDS])
1479					break;
1480				w = strlen(c->name) + 1;
1481				while (w < width) {
1482					putchar(' ');
1483					w++;
1484				}
1485			}
1486			printf("\r\n");
1487		}
1488		(void) fflush(stdout);
1489		reply(214, "Direct comments to ftp-bugs@%s.", hostname);
1490		return;
1491	}
1492	upper(s);
1493	c = lookup(ctab, s);
1494	if (c == NULL) {
1495		reply(502, "Unknown command %s.", s);
1496		return;
1497	}
1498	if (c->implemented)
1499		reply(214, "Syntax: %s%s %s", type, c->name, c->help);
1500	else
1501		reply(214, "%s%-*s\t%s; unimplemented.", type, width,
1502		    c->name, c->help);
1503}
1504
1505static void
1506sizecmd(filename)
1507	char *filename;
1508{
1509	switch (type) {
1510	case TYPE_L:
1511	case TYPE_I: {
1512		struct stat stbuf;
1513		if (stat(filename, &stbuf) < 0 || !S_ISREG(stbuf.st_mode))
1514			reply(550, "%s: not a plain file.", filename);
1515		else
1516			reply(213, "%lld", (long long)stbuf.st_size);
1517		break; }
1518	case TYPE_A: {
1519		FILE *fin;
1520		int c;
1521		off_t count;
1522		struct stat stbuf;
1523		fin = fopen(filename, "r");
1524		if (fin == NULL) {
1525			perror_reply(550, filename);
1526			return;
1527		}
1528		if (fstat(fileno(fin), &stbuf) < 0 || !S_ISREG(stbuf.st_mode)) {
1529			reply(550, "%s: not a plain file.", filename);
1530			(void) fclose(fin);
1531			return;
1532		}
1533		if (stbuf.st_size > 10240) {
1534			reply(550, "%s: file too large for SIZE.", filename);
1535			(void) fclose(fin);
1536			return;
1537		}
1538
1539		count = 0;
1540		while((c = getc(fin)) != EOF) {
1541			if (c == '\n')	/* will get expanded to \r\n */
1542				count++;
1543			count++;
1544		}
1545		(void) fclose(fin);
1546
1547		reply(213, "%lld", (long long)count);
1548		break; }
1549	default:
1550		reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]);
1551	}
1552}
1553