summaryrefslogtreecommitdiffstats
path: root/contrib/opie/ftpcmd.y
blob: 494dc819310dedbbee0cf8ee935012581e5325c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
/* ftpcmd.y: yacc parser for the FTP daemon.

%%% portions-copyright-cmetz-96
Portions of this software are Copyright 1996-1997 by Craig Metz, All Rights
Reserved. The Inner Net License Version 2 applies to these portions of
the software.
You should have received a copy of the license with this software. If
you didn't get a copy, you may request one from <license@inner.net>.

	History:

	Modified by cmetz for OPIE 2.3. Moved LS_COMMAND here.
        Modified by cmetz for OPIE 2.2. Fixed a *lot* of warnings.
                Use FUNCTION declaration et al. Removed useless strings.
                Changed some char []s to char *s. Deleted comment address.
                Changed tmpline references to be more pure-pointer
                references. Changed tmpline declaration back to char [].
	Modified at NRL for OPIE 2.1. Minor changes for autoconf.
        Modified at NRL for OPIE 2.01. Added forward declaration for sitetab[]
                -- fixes problems experienced by bison users. Merged in new 
                PORT attack fixes from Hobbit.
	Modified at NRL for OPIE 2.0.
	Originally from BSD.
*/
/*
 * Copyright (c) 1985, 1988 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	5.24 (Berkeley) 2/25/91
 */

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

%{
#include "opie_cfg.h"

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/ftp.h>
#include <signal.h>
#include <setjmp.h>
#include <syslog.h>
#if TM_IN_SYS_TIME
#include <sys/time.h>
#else /* TM_IN_SYS_TIME */
#include <time.h>
#endif /* TM_IN_SYS_TIME */
#include <pwd.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "opie.h"

#if HAVE_LS_G_FLAG
#define LS_COMMAND "/bin/ls -lgA"
#else /* HAVE_LS_G_FLAG */
#define LS_COMMAND "/bin/ls -lA"
#endif /* HAVE_LS_G_FLAG */

extern	struct sockaddr_in data_dest;
extern  struct sockaddr_in his_addr;
extern	int logged_in;
extern	struct passwd *pw;
extern	int guest;
extern	int type;
extern	int form;
extern	int debug;
extern	int timeout;
extern	int maxtimeout;
extern  int pdata;
extern	char *remotehost;
extern	char *proctitle;
extern	char *globerr;
extern	int usedefault;
extern  int transflag;
extern  char tmpline[];
char	**ftpglob();

VOIDRET dologout __P((int));
VOIDRET upper __P((char *));
VOIDRET nack __P((char *));
VOIDRET opiefatal __P((char *));

VOIDRET pass __P((char *));
int user __P((char *));
VOIDRET passive __P((void));
VOIDRET retrieve __P((char *, char *));
VOIDRET store __P((char *, char *, int));
VOIDRET send_file_list __P((char *));
VOIDRET statfilecmd __P((char *));
VOIDRET statcmd __P((void));
VOIDRET delete __P((char *));
VOIDRET renamecmd __P((char *, char *));
VOIDRET cwd __P((char *));
VOIDRET makedir __P((char *));
VOIDRET removedir __P((char *));
VOIDRET pwd __P((void));

VOIDRET sizecmd __P((char *));

off_t	restart_point;

static	int cmd_type;
static	int cmd_form;
static	int cmd_bytesz;
static  unsigned short cliport = 0;
char	cbuf[512];
char	*fromname;

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

VOIDRET help __P((struct tab *, char *));

struct tab cmdtab[], sitetab[];

%}

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

	SP	CRLF	COMMA	STRING	NUMBER

	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

	UMASK	IDLE	CHMOD

	LEXERR

%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((char *) $3);
			free((char *) $3);
		}
	|	PASS SP password CRLF
		= {
			pass((char *) $3);
			free((char *) $3);
		}
        |   PORT check_login SP host_port CRLF
                = {   
             usedefault = 0;  
             if (pdata >= 0) {
                 (void) close(pdata);
                 pdata = -1;
             }
/* H* port fix, part B: admonish the twit.
   Also require login before PORT works */
            if ($2) {
              if ((cliport > 1023) && (data_dest.sin_addr.s_addr > 0)) {
                reply(200, "PORT command successful.");
              } else {
                syslog (LOG_WARNING, "refused %s from %s",
                       cbuf, remotehost);
                reply(500, "You've GOT to be joking.");
              }
            }
                }
/*	|	PASV CRLF
		= {
			passive();
		} */
    |   PASV check_login CRLF
        = {
/* Require login for PASV, too.  This actually fixes a bug -- telnet to an
   unfixed wu-ftpd and type PASV first off, and it crashes! */
            if ($2) {
                passive();
            }
        }     
	|	TYPE SP type_code CRLF
		= {
			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 NBBY == 8
				if (cmd_bytesz == 8) {
					reply(200,
					    "Type set to L (byte size 8).");
					type = cmd_type;
				} else
					reply(504, "Byte size must be 8.");
#else /* NBBY == 8 */
				UNIMPLEMENTED for NBBY != 8
#endif /* NBBY == 8 */
			}
		}
	|	STRU SP struct_code CRLF
		= {
			switch ($3) {

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

			default:
				reply(504, "Unimplemented STRU type.");
			}
		}
	|	MODE SP mode_code CRLF
		= {
			switch ($3) {

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

			default:
				reply(502, "Unimplemented MODE type.");
			}
		}
	|	ALLO SP NUMBER CRLF
		= {
			reply(202, "ALLO command ignored.");
		}
	|	ALLO SP NUMBER SP R SP NUMBER CRLF
		= {
			reply(202, "ALLO command ignored.");
		}
	|	RETR check_login SP pathname CRLF
		= {
			if ($2 && $4)
				retrieve((char *) 0, (char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	STOR check_login SP pathname CRLF
		= {
			if ($2 && $4)
				store((char *) $4, "w", 0);
			if ($4)
				free((char *) $4);
		}
	|	APPE check_login SP pathname CRLF
		= {
			if ($2 && $4)
				store((char *) $4, "a", 0);
			if ($4)
				free((char *) $4);
		}
	|	NLST check_login CRLF
		= {
			if ($2)
				send_file_list(".");
		}
	|	NLST check_login SP STRING CRLF
		= {
			if ($2 && $4) 
				send_file_list((char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	LIST check_login CRLF
		= {
			if ($2)
				retrieve(LS_COMMAND, "");
		}
	|	LIST check_login SP pathname CRLF
		= {
			if ($2 && $4)
                                {
                                char buffer[sizeof(LS_COMMAND)+3];
                                strcpy(buffer, LS_COMMAND);
                                strcat(buffer, " %s");
				retrieve(buffer, (char *) $4);
                                }
			if ($4)
				free((char *) $4);
		}
	|	STAT check_login SP pathname CRLF
		= {
			if ($2 && $4)
				statfilecmd((char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	STAT CRLF
		= {
			statcmd();
		}
	|	DELE check_login SP pathname CRLF
		= {
			if ($2 && $4)
				delete((char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	RNTO SP pathname CRLF
		= {
			if (fromname) {
				renamecmd(fromname, (char *) $3);
				free(fromname);
				fromname = (char *) 0;
			} else {
				reply(503, "Bad sequence of commands.");
			}
			free((char *) $3);
		}
	|	ABOR CRLF
		= {
			reply(225, "ABOR command successful.");
		}
	|	CWD check_login CRLF
		= {
			if ($2)
				cwd(pw->pw_dir);
		}
	|	CWD check_login SP pathname CRLF
		= {
			if ($2 && $4)
				cwd((char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	HELP CRLF
		= {
			help(cmdtab, (char *) 0);
		}
	|	HELP SP STRING CRLF
		= {
			register char *cp = (char *)$3;

			if (strncasecmp(cp, "SITE", 4) == 0) {
				cp = (char *)$3 + 4;
				if (*cp == ' ')
					cp++;
				if (*cp)
					help(sitetab, cp);
				else
					help(sitetab, (char *) 0);
			} else
				help(cmdtab, (char *) $3);
		}
	|	NOOP CRLF
		= {
			reply(200, "NOOP command successful.");
		}
	|	MKD check_login SP pathname CRLF
		= {
			if ($2 && $4)
				makedir((char *) $4);
			if ($4)
				free((char *) $4);
		}
	|	RMD check_login SP pathname CRLF
		= {
			if ($2 && $4)
				removedir((char *) $4);
			if ($4)
				free((char *) $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, (char *) $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) {
				if ($6 > 0777)
					reply(501,
				"CHMOD: Mode value must be between 0 and 0777");
				else if (chmod((char *) $8, $6) < 0)
					perror_reply(550, (char *) $8);
				else
					reply(200, "CHMOD command successful.");
			}
			if ($8)
				free((char *) $8);
		}
	|	SITE SP IDLE CRLF
		= {
			reply(200,
			    "Current IDLE time limit is %d seconds; max %d",
				timeout, maxtimeout);
		}
	|	SITE SP IDLE SP NUMBER CRLF
		= {
			if ($5 < 30 || $5 > maxtimeout) {
				reply(501,
			"Maximum IDLE time must be between 30 and %d seconds",
				    maxtimeout);
			} else {
				timeout = $5;
				(void) alarm((unsigned) timeout);
				reply(200,
				    "Maximum IDLE time set to %d seconds",
				    timeout);
			}
		}
	|	STOU check_login SP pathname CRLF
		= {
			if ($2 && $4)
				store((char *) $4, "w", 1);
			if ($4)
				free((char *) $4);
		}
	|	SYST CRLF
		= {
#ifdef unix
#ifdef BSD
			reply(215, "UNIX Type: L%d Version: BSD-%d",
				NBBY, BSD);
#else /* BSD */
			reply(215, "UNIX Type: L%d", NBBY);
#endif /* BSD */
#else /* unix */
			reply(215, "UNKNOWN Type: L%d", NBBY);
#endif /* unix */
		}

		/*
		 * 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)
				sizecmd((char *) $4);
			if ($4)
				free((char *) $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) {
				struct stat stbuf;
				if (stat((char *) $4, &stbuf) < 0)
					perror_reply(550, (char *) $4);
				else if ((stbuf.st_mode&S_IFMT) != S_IFREG) {
					reply(550, "%s: not a plain file.",
						(char *) $4);
				} else {
					register struct tm *t;
					struct tm *gmtime();
					t = gmtime(&stbuf.st_mtime);
					reply(213,
					    "%d%02d%02d%02d%02d%02d",
					    t->tm_year+1900, t->tm_mon+1, t->tm_mday,
					    t->tm_hour, t->tm_min, t->tm_sec);
				}
			}
			if ($4)
				free((char *) $4);
		}
	|	QUIT CRLF
		= {
			reply(221, "Goodbye.");
			dologout(0);
		}
	|	error CRLF
		= {
			yyerrok;
		}
	;
rcmd:		RNFR check_login SP pathname CRLF
		= {
			char *renamefrom();

			restart_point = (off_t) 0;
			if ($2 && $4) {
				fromname = renamefrom((char *) $4);
				if (fromname == (char *) 0 && $4) {
					free((char *) $4);
				}
			}
		}
	|	REST SP byte_size CRLF
		= {
			long atol();

			fromname = (char *) 0;
			restart_point = $3;
			reply(350, "Restarting at %ld. %s", restart_point,
			    "Send STORE or RETRIEVE to initiate transfer.");
		}
	;
		
username:	STRING
	;

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

byte_size:	NUMBER
	;

host_port:	NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 
		NUMBER COMMA NUMBER
		= {
			register char *a, *p;

			a = (char *)&data_dest.sin_addr;
			a[0] = $1; a[1] = $3; a[2] = $5; a[3] = $7;

/* H* port fix, part A-1: Check the args against the client addr */
            p = (char *)&his_addr.sin_addr;
             if (memcmp (a, p, sizeof (data_dest.sin_addr))) 
                 memset (a, 0, sizeof (data_dest.sin_addr));     /* XXX */

			p = (char *)&data_dest.sin_port;

/* H* port fix, part A-2: only allow client ports in "user space" */
            p[0] = 0; p[1] = 0;
            cliport = ($9 << 8) + $11;
            if (cliport > 1023) {
                 p[0] = $9; p[1] = $11;
            } 

			p[0] = $9; p[1] = $11;
			data_dest.sin_family = AF_INET;
		}
	;

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 = NBBY;
	}
	|	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 && strncmp((char *) $1, "~", 1) == 0) {
			*(char **)&($$) = *ftpglob((char *) $1);
			if (globerr != NULL) {
				reply(550, globerr);
/*				$$ = NULL; */
				$$ = 0;
			}
			free((char *) $1);
		} else
			$$ = $1;
	}
	;

pathstring:	STRING
	;

octal_number:	NUMBER
	= {
		register 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)" },
	{ "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,	"(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 }
};

struct tab *lookup FUNCTION((p, cmd), register struct tab *p AND 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.
 */
char *getline FUNCTION((s, n, iop), char *s AND int n AND FILE *iop)
{
	register c;
	register char *cs;

	cs = s;
/* tmpline may contain saved command from urgent mode interruption */
	for (c = 0; *(tmpline + c) && --n > 0; ++c) {
		*cs++ = *(tmpline + c);
		if (*(tmpline + c) == '\n') {
			*cs++ = '\0';
			if (debug)
				syslog(LOG_DEBUG, "command: %s", s);
			*tmpline = '\0';
			return(s);
		}
		if (c == 0)
			*tmpline = '\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 || c == '\n')
			break;
	}
	if (c == EOF && cs == s)
		return (NULL);
	*cs++ = '\0';
	if (debug)
		syslog(LOG_DEBUG, "command: %s", s);
	return (s);
}

static VOIDRET toolong FUNCTION((input), int input)
{
	time_t now;

	reply(421, "Timeout (%d seconds): closing control connection.", timeout);
	(void) time(&now);
        syslog(LOG_INFO, "User %s timed out after %d seconds at %s",
          (pw ? pw -> pw_name : "unknown"), timeout, ctime(&now));
	dologout(1);
}

int yylex FUNCTION_NOARGS
{
	static int cpos, state;
	register char *cp, *cp2;
	register struct tab *p;
	int n;
	char c, *copy();

	for (;;) {
		switch (state) {

		case CMD:
			(void) signal(SIGALRM, toolong);
			(void) alarm((unsigned) timeout);
			if (getline(cbuf, sizeof(cbuf)-1, stdin) == NULL) {
				reply(221, "You could at least say goodbye.");
				dologout(0);
			}
			(void) alarm(0);
#ifdef SETPROCTITLE
			if (strncasecmp(cbuf, "PASS", 4) != NULL)
				setproctitle("%s: %s", proctitle, cbuf);
#endif /* SETPROCTITLE */
			if ((cp = strchr(cbuf, '\r'))) {
				*cp++ = '\n';
				*cp = '\0';
			}
			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;
				*(char **)&yylval = 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;
				*(char **)&yylval = 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++;
				state = state == OSTR ? STR2 : ++state;
				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';
				*(char **)&yylval = copy(cp);
				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 = atoi(cp);
				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 = atoi(cp);
				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:
			opiefatal("Unknown state in scanner.");
		}
		yyerror((char *) 0);
		state = CMD;
		longjmp(errcatch,0);
	}
}

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

char *copy FUNCTION((s), char *s)
{
	char *p;

	p = malloc((unsigned) strlen(s) + 1);
	if (p == NULL)
		opiefatal("Ran out of memory.");
	(void) strcpy(p, s);
	return (p);
}

VOIDRET help FUNCTION((ctab, s), struct tab *ctab AND char *s)
{
	register struct tab *c;
	register int width, NCMDS;
	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) {
		register 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, " ");
		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);
}

VOIDRET sizecmd FUNCTION((filename), char *filename)
{
	switch (type) {
	case TYPE_L:
	case TYPE_I: {
		struct stat stbuf;
		if (stat(filename, &stbuf) < 0 ||
		    (stbuf.st_mode&S_IFMT) != S_IFREG)
			reply(550, "%s: not a plain file.", filename);
		else
			reply(213, "%lu", stbuf.st_size);
		break;}
	case TYPE_A: {
		FILE *fin;
		register int c;
		register long count;
		struct stat stbuf;
		fin = fopen(filename, "r");
		if (fin == NULL) {
			perror_reply(550, filename);
			return;
		}
		if (fstat(fileno(fin), &stbuf) < 0 ||
		    (stbuf.st_mode&S_IFMT) != S_IFREG) {
			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, "%ld", count);
		break;}
	default:
		reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]);
	}
}
OpenPOWER on IntegriCloud