1/* $OpenBSD: ftpcmd.y,v 1.75 2024/04/28 16:42:53 florian 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, "."); 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) == -1) 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) == -1) 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 if (t == NULL) { 617 /* invalid time, use epoch */ 618 stbuf.st_mtime = 0; 619 t = gmtime(&stbuf.st_mtime); 620 } 621 reply(213, 622 "%04d%02d%02d%02d%02d%02d", 623 1900 + t->tm_year, 624 t->tm_mon+1, t->tm_mday, 625 t->tm_hour, t->tm_min, t->tm_sec); 626 } 627 } 628 if ($4 != NULL) 629 free($4); 630 } 631 | QUIT CRLF 632 { 633 reply(221, "Goodbye."); 634 dologout(0); 635 } 636 | error 637 { 638 yyclearin; /* discard lookahead data */ 639 yyerrok; /* clear error condition */ 640 state = 0; /* reset lexer state */ 641 } 642 ; 643rcmd 644 : RNFR check_login SP pathname CRLF 645 { 646 restart_point = 0; 647 if ($2 && $4) { 648 if (fromname) 649 free(fromname); 650 fromname = renamefrom($4); 651 if (fromname == NULL) 652 free($4); 653 } else if ($4) { 654 free ($4); 655 } 656 } 657 658 | REST check_login SP file_size CRLF 659 { 660 if ($2) { 661 if (fromname) { 662 free(fromname); 663 fromname = NULL; 664 } 665 restart_point = $4; 666 reply(350, "Restarting at %lld. %s", 667 (long long)restart_point, 668 "Send STORE or RETRIEVE to initiate transfer."); 669 } 670 } 671 ; 672 673username 674 : STRING 675 ; 676 677password 678 : /* empty */ 679 { 680 $$ = calloc(1, sizeof(char)); 681 } 682 | STRING 683 ; 684 685byte_size 686 : NUMBER 687 ; 688 689file_size 690 : NUMBER 691 { 692 $$ = $1; 693 } 694 | BIGNUM 695 { 696 $$ = $1; 697 } 698 ; 699 700host_port 701 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 702 NUMBER COMMA NUMBER 703 { 704 char *a, *p; 705 706 if ($1 < 0 || $1 > 255 || $3 < 0 || $3 > 255 || 707 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 708 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255) { 709 $$ = 1; 710 } else { 711 data_dest.su_sin.sin_len = sizeof(struct sockaddr_in); 712 data_dest.su_sin.sin_family = AF_INET; 713 p = (char *)&data_dest.su_sin.sin_port; 714 p[0] = $9; p[1] = $11; 715 a = (char *)&data_dest.su_sin.sin_addr; 716 a[0] = $1; a[1] = $3; a[2] = $5; a[3] = $7; 717 $$ = 0; 718 } 719 } 720 ; 721 722host_long_port4 723 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 724 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 725 NUMBER 726 { 727 char *a, *p; 728 729 /* reject invalid LPRT command */ 730 if ($1 != 4 || $3 != 4 || 731 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 732 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 || 733 $13 != 2 || 734 $15 < 0 || $15 > 255 || $17 < 0 || $17 > 255) { 735 $$ = 1; 736 } else { 737 data_dest.su_sin.sin_len = 738 sizeof(struct sockaddr_in); 739 data_dest.su_family = AF_INET; 740 p = (char *)&data_dest.su_port; 741 p[0] = $15; p[1] = $17; 742 a = (char *)&data_dest.su_sin.sin_addr; 743 a[0] = $5; a[1] = $7; a[2] = $9; a[3] = $11; 744 $$ = 0; 745 } 746 } 747 ; 748 749host_long_port6 750 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 751 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 752 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 753 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 754 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 755 NUMBER 756 { 757 char *a, *p; 758 759 /* reject invalid LPRT command */ 760 if ($1 != 6 || $3 != 16 || 761 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 762 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 || 763 $13 < 0 || $13 > 255 || $15 < 0 || $15 > 255 || 764 $17 < 0 || $17 > 255 || $19 < 0 || $19 > 255 || 765 $21 < 0 || $21 > 255 || $23 < 0 || $23 > 255 || 766 $25 < 0 || $25 > 255 || $27 < 0 || $27 > 255 || 767 $29 < 0 || $29 > 255 || $31 < 0 || $31 > 255 || 768 $33 < 0 || $33 > 255 || $35 < 0 || $35 > 255 || 769 $37 != 2 || 770 $39 < 0 || $39 > 255 || $41 < 0 || $41 > 255) { 771 $$ = 1; 772 } else { 773 data_dest.su_sin6.sin6_len = 774 sizeof(struct sockaddr_in6); 775 data_dest.su_family = AF_INET6; 776 p = (char *)&data_dest.su_port; 777 p[0] = $39; p[1] = $41; 778 a = (char *)&data_dest.su_sin6.sin6_addr; 779 a[0] = $5; a[1] = $7; 780 a[2] = $9; a[3] = $11; 781 a[4] = $13; a[5] = $15; 782 a[6] = $17; a[7] = $19; 783 a[8] = $21; a[9] = $23; 784 a[10] = $25; a[11] = $27; 785 a[12] = $29; a[13] = $31; 786 a[14] = $33; a[15] = $35; 787 if (his_addr.su_family == AF_INET6) { 788 /* XXX more sanity checks! */ 789 data_dest.su_sin6.sin6_scope_id = 790 his_addr.su_sin6.sin6_scope_id; 791 } 792 793 $$ = 0; 794 } 795 } 796 ; 797 798form_code 799 : N 800 { 801 $$ = FORM_N; 802 } 803 | T 804 { 805 $$ = FORM_T; 806 } 807 | C 808 { 809 $$ = FORM_C; 810 } 811 ; 812 813type_code 814 : A 815 { 816 cmd_type = TYPE_A; 817 cmd_form = FORM_N; 818 } 819 | A SP form_code 820 { 821 cmd_type = TYPE_A; 822 cmd_form = $3; 823 } 824 | E 825 { 826 cmd_type = TYPE_E; 827 cmd_form = FORM_N; 828 } 829 | E SP form_code 830 { 831 cmd_type = TYPE_E; 832 cmd_form = $3; 833 } 834 | I 835 { 836 cmd_type = TYPE_I; 837 } 838 | L 839 { 840 cmd_type = TYPE_L; 841 cmd_bytesz = 8; 842 } 843 | L SP byte_size 844 { 845 cmd_type = TYPE_L; 846 cmd_bytesz = $3; 847 } 848 /* this is for a bug in the BBN ftp */ 849 | L byte_size 850 { 851 cmd_type = TYPE_L; 852 cmd_bytesz = $2; 853 } 854 ; 855 856struct_code 857 : F 858 { 859 $$ = STRU_F; 860 } 861 | R 862 { 863 $$ = STRU_R; 864 } 865 | P 866 { 867 $$ = STRU_P; 868 } 869 ; 870 871mode_code 872 : S 873 { 874 $$ = MODE_S; 875 } 876 | B 877 { 878 $$ = MODE_B; 879 } 880 | C 881 { 882 $$ = MODE_C; 883 } 884 ; 885 886pathname 887 : pathstring 888 { 889 /* 890 * Problem: this production is used for all pathname 891 * processing, but only gives a 550 error reply. 892 * This is a valid reply in some cases but not in others. 893 */ 894 if (logged_in && $1 && strchr($1, '~') != NULL) { 895 glob_t gl; 896 int flags = 897 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 898 char *pptr = $1; 899 900 /* 901 * glob() will only find a leading ~, but 902 * Netscape kindly puts a slash in front of 903 * it for publish URLs. There needs to be 904 * a flag for glob() that expands tildes 905 * anywhere in the string. 906 */ 907 if ((pptr[0] == '/') && (pptr[1] == '~')) 908 pptr++; 909 910 memset(&gl, 0, sizeof(gl)); 911 if (glob(pptr, flags, NULL, &gl) || 912 gl.gl_pathc == 0) { 913 reply(550, "not found"); 914 $$ = NULL; 915 } else { 916 $$ = strdup(gl.gl_pathv[0]); 917 } 918 globfree(&gl); 919 free($1); 920 } else 921 $$ = $1; 922 } 923 ; 924 925pathstring 926 : STRING 927 ; 928 929octal_number 930 : NUMBER 931 { 932 int ret, dec, multby, digit; 933 934 /* 935 * Convert a number that was read as decimal number 936 * to what it would be if it had been read as octal. 937 */ 938 dec = $1; 939 multby = 1; 940 ret = 0; 941 while (dec) { 942 digit = dec%10; 943 if (digit > 7) { 944 ret = -1; 945 break; 946 } 947 ret += digit * multby; 948 multby *= 8; 949 dec /= 10; 950 } 951 $$ = ret; 952 } 953 ; 954 955 956check_login 957 : /* empty */ 958 { 959 if (logged_in) 960 $$ = 1; 961 else { 962 reply(530, "Please login with USER and PASS."); 963 $$ = 0; 964 state = 0; 965 YYABORT; 966 } 967 } 968 ; 969 970check_login_epsvall 971 : /* empty */ 972 { 973 if (!logged_in) { 974 reply(530, "Please login with USER and PASS."); 975 $$ = 0; 976 state = 0; 977 YYABORT; 978 } else if (epsvall) { 979 reply(501, "the command is disallowed " 980 "after EPSV ALL"); 981 usedefault = 1; 982 $$ = 0; 983 } else 984 $$ = 1; 985 } 986 ; 987 988%% 989 990#define CMD 0 /* beginning of command */ 991#define ARGS 1 /* expect miscellaneous arguments */ 992#define STR1 2 /* expect SP followed by STRING */ 993#define STR2 3 /* expect STRING */ 994#define OSTR 4 /* optional SP then STRING */ 995#define ZSTR1 5 /* SP then optional STRING */ 996#define ZSTR2 6 /* optional STRING after SP */ 997#define SITECMD 7 /* SITE command */ 998#define NSTR 8 /* Number followed by a string */ 999 1000struct tab { 1001 char *name; 1002 short token; 1003 short state; 1004 short implemented; /* 1 if command is implemented */ 1005 char *help; 1006}; 1007 1008struct tab cmdtab[] = { /* In order defined in RFC 765 */ 1009 { "USER", USER, STR1, 1, "<sp> username" }, 1010 { "PASS", PASS, ZSTR1, 1, "<sp> password" }, 1011 { "ACCT", ACCT, STR1, 0, "(specify account)" }, 1012 { "SMNT", SMNT, ARGS, 0, "(structure mount)" }, 1013 { "REIN", REIN, ARGS, 0, "(reinitialize server state)" }, 1014 { "QUIT", QUIT, ARGS, 1, "(terminate service)", }, 1015 { "PORT", PORT, ARGS, 1, "<sp> b0, b1, b2, b3, b4" }, 1016 { "LPRT", LPRT, ARGS, 1, "<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." }, 1017 { "EPRT", EPRT, STR1, 1, "<sp> |af|addr|port|" }, 1018 { "PASV", PASV, ARGS, 1, "(set server in passive mode)" }, 1019 { "LPSV", LPSV, ARGS, 1, "(set server in passive mode)" }, 1020 { "EPSV", EPSV, ARGS, 1, "[<sp> af|ALL]" }, 1021 { "TYPE", TYPE, ARGS, 1, "<sp> [ A | E | I | L ]" }, 1022 { "STRU", STRU, ARGS, 1, "(specify file structure)" }, 1023 { "MODE", MODE, ARGS, 1, "(specify transfer mode)" }, 1024 { "RETR", RETR, STR1, 1, "<sp> file-name" }, 1025 { "STOR", STOR, STR1, 1, "<sp> file-name" }, 1026 { "APPE", APPE, STR1, 1, "<sp> file-name" }, 1027 { "MLFL", MLFL, OSTR, 0, "(mail file)" }, 1028 { "MAIL", MAIL, OSTR, 0, "(mail to user)" }, 1029 { "MSND", MSND, OSTR, 0, "(mail send to terminal)" }, 1030 { "MSOM", MSOM, OSTR, 0, "(mail send to terminal or mailbox)" }, 1031 { "MSAM", MSAM, OSTR, 0, "(mail send to terminal and mailbox)" }, 1032 { "MRSQ", MRSQ, OSTR, 0, "(mail recipient scheme question)" }, 1033 { "MRCP", MRCP, STR1, 0, "(mail recipient)" }, 1034 { "ALLO", ALLO, ARGS, 1, "allocate storage (vacuously)" }, 1035 { "REST", REST, ARGS, 1, "<sp> offset (restart command)" }, 1036 { "RNFR", RNFR, STR1, 1, "<sp> file-name" }, 1037 { "RNTO", RNTO, STR1, 1, "<sp> file-name" }, 1038 { "ABOR", ABOR, ARGS, 1, "(abort operation)" }, 1039 { "DELE", DELE, STR1, 1, "<sp> file-name" }, 1040 { "CWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1041 { "XCWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1042 { "LIST", LIST, OSTR, 1, "[ <sp> path-name ]" }, 1043 { "NLST", NLST, OSTR, 1, "[ <sp> path-name ]" }, 1044 { "SITE", SITE, SITECMD, 1, "site-cmd [ <sp> arguments ]" }, 1045 { "SYST", SYST, ARGS, 1, "(get type of operating system)" }, 1046 { "STAT", STAT, OSTR, 1, "[ <sp> path-name ]" }, 1047 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1048 { "NOOP", NOOP, ARGS, 1, "" }, 1049 { "MKD", MKD, STR1, 1, "<sp> path-name" }, 1050 { "XMKD", MKD, STR1, 1, "<sp> path-name" }, 1051 { "RMD", RMD, STR1, 1, "<sp> path-name" }, 1052 { "XRMD", RMD, STR1, 1, "<sp> path-name" }, 1053 { "PWD", PWD, ARGS, 1, "(return current directory)" }, 1054 { "XPWD", PWD, ARGS, 1, "(return current directory)" }, 1055 { "CDUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1056 { "XCUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1057 { "STOU", STOU, STR1, 1, "<sp> file-name" }, 1058 { "SIZE", SIZE, OSTR, 1, "<sp> path-name" }, 1059 { "MDTM", MDTM, OSTR, 1, "<sp> path-name" }, 1060 { NULL, 0, 0, 0, 0 } 1061}; 1062 1063struct tab sitetab[] = { 1064 { "UMASK", UMASK, ARGS, 1, "[ <sp> umask ]" }, 1065 { "IDLE", IDLE, ARGS, 1, "[ <sp> maximum-idle-time ]" }, 1066 { "CHMOD", CHMOD, NSTR, 1, "<sp> mode <sp> file-name" }, 1067 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1068 { NULL, 0, 0, 0, 0 } 1069}; 1070 1071static void help(struct tab *, char *); 1072static struct tab * 1073 lookup(struct tab *, const char *); 1074static void sizecmd(const char *); 1075static int yylex(void); 1076 1077extern int epsvall; 1078 1079static struct tab * 1080lookup(struct tab *p, const char *cmd) 1081{ 1082 1083 for (; p->name != NULL; p++) 1084 if (strcmp(cmd, p->name) == 0) 1085 return (p); 1086 return (NULL); 1087} 1088 1089#include <arpa/telnet.h> 1090 1091/* 1092 * get_line - a hacked up version of fgets to ignore TELNET escape codes. 1093 */ 1094int 1095get_line(char *s, int n) 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(stdin)) != EOF) { 1115 c &= 0377; 1116 if (c == IAC) { 1117 if ((c = getc(stdin)) != EOF) { 1118 c &= 0377; 1119 switch (c) { 1120 case WILL: 1121 case WONT: 1122 c = getc(stdin); 1123 printf("%c%c%c", IAC, DONT, 0377&c); 1124 (void) fflush(stdout); 1125 continue; 1126 case DO: 1127 case DONT: 1128 c = getc(stdin); 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(stdin)) != 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 1178void 1179toolong(int signo) 1180{ 1181 struct syslog_data sdata = SYSLOG_DATA_INIT; 1182 1183 reply_r(421, 1184 "Timeout (%d seconds): closing control connection.", timeout); 1185 if (logging) 1186 syslog_r(LOG_INFO, &sdata, "User %s timed out after %d seconds", 1187 (pw ? pw -> pw_name : "unknown"), timeout); 1188 dologout(1); 1189} 1190 1191static int 1192yylex(void) 1193{ 1194 static int cpos; 1195 char *cp, *cp2; 1196 struct tab *p; 1197 int n; 1198 char c; 1199 1200 for (;;) { 1201 switch (state) { 1202 1203 case CMD: 1204 (void) alarm((unsigned) timeout); 1205 n = get_line(cbuf, sizeof(cbuf)-1); 1206 if (n == -1) { 1207 reply(221, "You could at least say goodbye."); 1208 dologout(0); 1209 } else if (n == -2) { 1210 reply(500, "Command too long."); 1211 alarm(0); 1212 continue; 1213 } 1214 (void) alarm(0); 1215 if ((cp = strchr(cbuf, '\r'))) { 1216 *cp++ = '\n'; 1217 *cp = '\0'; 1218 } 1219 if (strncasecmp(cbuf, "PASS", 4) != 0) { 1220 if ((cp = strpbrk(cbuf, "\n"))) { 1221 c = *cp; 1222 *cp = '\0'; 1223 setproctitle("%s: %s", proctitle, cbuf); 1224 *cp = c; 1225 } 1226 } 1227 if ((cp = strpbrk(cbuf, " \n"))) 1228 cpos = cp - cbuf; 1229 if (cpos == 0) 1230 cpos = 4; 1231 c = cbuf[cpos]; 1232 cbuf[cpos] = '\0'; 1233 upper(cbuf); 1234 p = lookup(cmdtab, cbuf); 1235 cbuf[cpos] = c; 1236 if (p != NULL) { 1237 if (p->implemented == 0) { 1238 nack(p->name); 1239 return (LEXERR); 1240 } 1241 state = p->state; 1242 yylval.s = p->name; 1243 return (p->token); 1244 } 1245 break; 1246 1247 case SITECMD: 1248 if (cbuf[cpos] == ' ') { 1249 cpos++; 1250 return (SP); 1251 } 1252 cp = &cbuf[cpos]; 1253 if ((cp2 = strpbrk(cp, " \n"))) 1254 cpos = cp2 - cbuf; 1255 c = cbuf[cpos]; 1256 cbuf[cpos] = '\0'; 1257 upper(cp); 1258 p = lookup(sitetab, cp); 1259 cbuf[cpos] = c; 1260 if (p != NULL) { 1261 if (p->implemented == 0) { 1262 state = CMD; 1263 nack(p->name); 1264 return (LEXERR); 1265 } 1266 state = p->state; 1267 yylval.s = p->name; 1268 return (p->token); 1269 } 1270 state = CMD; 1271 break; 1272 1273 case OSTR: 1274 if (cbuf[cpos] == '\n') { 1275 state = CMD; 1276 return (CRLF); 1277 } 1278 /* FALLTHROUGH */ 1279 1280 case STR1: 1281 case ZSTR1: 1282 dostr1: 1283 if (cbuf[cpos] == ' ') { 1284 cpos++; 1285 state = state == OSTR ? STR2 : state+1; 1286 return (SP); 1287 } 1288 break; 1289 1290 case ZSTR2: 1291 if (cbuf[cpos] == '\n') { 1292 state = CMD; 1293 return (CRLF); 1294 } 1295 /* FALLTHROUGH */ 1296 1297 case STR2: 1298 cp = &cbuf[cpos]; 1299 n = strlen(cp); 1300 cpos += n - 1; 1301 /* 1302 * Make sure the string is nonempty and \n terminated. 1303 */ 1304 if (n > 1 && cbuf[cpos] == '\n') { 1305 cbuf[cpos] = '\0'; 1306 yylval.s = strdup(cp); 1307 if (yylval.s == NULL) 1308 fatal("Ran out of memory."); 1309 cbuf[cpos] = '\n'; 1310 state = ARGS; 1311 return (STRING); 1312 } 1313 break; 1314 1315 case NSTR: 1316 if (cbuf[cpos] == ' ') { 1317 cpos++; 1318 return (SP); 1319 } 1320 if (isdigit((unsigned char)cbuf[cpos])) { 1321 cp = &cbuf[cpos]; 1322 while (isdigit((unsigned char)cbuf[++cpos])) 1323 ; 1324 c = cbuf[cpos]; 1325 cbuf[cpos] = '\0'; 1326 yylval.i = atoi(cp); 1327 cbuf[cpos] = c; 1328 state = STR1; 1329 return (NUMBER); 1330 } 1331 state = STR1; 1332 goto dostr1; 1333 1334 case ARGS: 1335 if (isdigit((unsigned char)cbuf[cpos])) { 1336 long long llval; 1337 1338 cp = &cbuf[cpos]; 1339 errno = 0; 1340 llval = strtoll(cp, &cp2, 10); 1341 if (llval < 0 || 1342 (errno == ERANGE && llval == LLONG_MAX)) 1343 break; 1344 1345 cpos = (int)(cp2 - cbuf); 1346 if (llval > INT_MAX) { 1347 yylval.o = llval; 1348 return (BIGNUM); 1349 } else { 1350 yylval.i = (int)llval; 1351 return (NUMBER); 1352 } 1353 } 1354 if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 && 1355 !isalnum((unsigned char)cbuf[cpos + 3])) { 1356 cpos += 3; 1357 return ALL; 1358 } 1359 switch (cbuf[cpos++]) { 1360 1361 case '\n': 1362 state = CMD; 1363 return (CRLF); 1364 1365 case ' ': 1366 return (SP); 1367 1368 case ',': 1369 return (COMMA); 1370 1371 case 'A': 1372 case 'a': 1373 return (A); 1374 1375 case 'B': 1376 case 'b': 1377 return (B); 1378 1379 case 'C': 1380 case 'c': 1381 return (C); 1382 1383 case 'E': 1384 case 'e': 1385 return (E); 1386 1387 case 'F': 1388 case 'f': 1389 return (F); 1390 1391 case 'I': 1392 case 'i': 1393 return (I); 1394 1395 case 'L': 1396 case 'l': 1397 return (L); 1398 1399 case 'N': 1400 case 'n': 1401 return (N); 1402 1403 case 'P': 1404 case 'p': 1405 return (P); 1406 1407 case 'R': 1408 case 'r': 1409 return (R); 1410 1411 case 'S': 1412 case 's': 1413 return (S); 1414 1415 case 'T': 1416 case 't': 1417 return (T); 1418 1419 } 1420 break; 1421 1422 default: 1423 fatal("Unknown state in scanner."); 1424 } 1425 state = CMD; 1426 return (LEXERR); 1427 } 1428} 1429 1430void 1431upper(char *s) 1432{ 1433 char *p; 1434 1435 for (p = s; *p; p++) 1436 *p = (char)toupper((unsigned char)*p); 1437} 1438 1439static void 1440help(struct tab *ctab, char *s) 1441{ 1442 struct tab *c; 1443 int width, NCMDS; 1444 char *type; 1445 1446 if (ctab == sitetab) 1447 type = "SITE "; 1448 else 1449 type = ""; 1450 width = 0, NCMDS = 0; 1451 for (c = ctab; c->name != NULL; c++) { 1452 int len = strlen(c->name); 1453 1454 if (len > width) 1455 width = len; 1456 NCMDS++; 1457 } 1458 width = (width + 8) &~ 7; 1459 if (s == NULL) { 1460 int i, j, w; 1461 int columns, lines; 1462 1463 lreply(214, "The following %scommands are recognized %s.", 1464 type, "(* =>'s unimplemented)"); 1465 columns = 76 / width; 1466 if (columns == 0) 1467 columns = 1; 1468 lines = (NCMDS + columns - 1) / columns; 1469 for (i = 0; i < lines; i++) { 1470 printf(" "); 1471 for (j = 0; j < columns; j++) { 1472 c = ctab + j * lines + i; 1473 printf("%s%c", c->name, 1474 c->implemented ? ' ' : '*'); 1475 if (c + lines >= &ctab[NCMDS]) 1476 break; 1477 w = strlen(c->name) + 1; 1478 while (w < width) { 1479 putchar(' '); 1480 w++; 1481 } 1482 } 1483 printf("\r\n"); 1484 } 1485 (void) fflush(stdout); 1486 reply(214, "Direct comments to ftp-bugs@%s.", hostname); 1487 return; 1488 } 1489 upper(s); 1490 c = lookup(ctab, s); 1491 if (c == NULL) { 1492 reply(502, "Unknown command %s.", s); 1493 return; 1494 } 1495 if (c->implemented) 1496 reply(214, "Syntax: %s%s %s", type, c->name, c->help); 1497 else 1498 reply(214, "%s%-*s\t%s; unimplemented.", type, width, 1499 c->name, c->help); 1500} 1501 1502static void 1503sizecmd(const char *filename) 1504{ 1505 switch (type) { 1506 case TYPE_L: 1507 case TYPE_I: { 1508 struct stat stbuf; 1509 if (stat(filename, &stbuf) == -1 || !S_ISREG(stbuf.st_mode)) 1510 reply(550, "%s: not a plain file.", filename); 1511 else 1512 reply(213, "%lld", (long long)stbuf.st_size); 1513 break; } 1514 case TYPE_A: { 1515 FILE *fin; 1516 int c; 1517 off_t count; 1518 struct stat stbuf; 1519 fin = fopen(filename, "r"); 1520 if (fin == NULL) { 1521 perror_reply(550, filename); 1522 return; 1523 } 1524 if (fstat(fileno(fin), &stbuf) == -1 || !S_ISREG(stbuf.st_mode)) { 1525 reply(550, "%s: not a plain file.", filename); 1526 (void) fclose(fin); 1527 return; 1528 } 1529 if (stbuf.st_size > 10240) { 1530 reply(550, "%s: file too large for SIZE.", filename); 1531 (void) fclose(fin); 1532 return; 1533 } 1534 1535 count = 0; 1536 while((c = getc(fin)) != EOF) { 1537 if (c == '\n') /* will get expanded to \r\n */ 1538 count++; 1539 count++; 1540 } 1541 (void) fclose(fin); 1542 1543 reply(213, "%lld", (long long)count); 1544 break; } 1545 default: 1546 reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]); 1547 } 1548} 1549