1 /* $OpenBSD: ftpcmd.y,v 1.73 2021/05/31 16:18:01 jan 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 66 extern union sockunion data_dest; 67 extern int logged_in; 68 extern struct passwd *pw; 69 extern int guest; 70 extern int logging; 71 extern int type; 72 extern int form; 73 extern int debug; 74 extern int timeout; 75 extern int maxtimeout; 76 extern int pdata; 77 extern char hostname[], remotehost[]; 78 extern char proctitle[]; 79 extern int usedefault; 80 extern int transflag; 81 extern char tmpline[]; 82 extern int portcheck; 83 extern union sockunion his_addr; 84 extern int umaskchange; 85 86 off_t restart_point; 87 88 static int cmd_type; 89 static int cmd_form; 90 static int cmd_bytesz; 91 static int state; 92 static int quit; 93 char cbuf[512]; 94 char *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 %% 137 138 cmd_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 ; 150 151 cmd 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 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 ; 638 rcmd 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 ; 667 668 username 669 : STRING 670 ; 671 672 password 673 : /* empty */ 674 { 675 $$ = calloc(1, sizeof(char)); 676 } 677 | STRING 678 ; 679 680 byte_size 681 : NUMBER 682 ; 683 684 file_size 685 : NUMBER 686 { 687 $$ = $1; 688 } 689 | BIGNUM 690 { 691 $$ = $1; 692 } 693 ; 694 695 host_port 696 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 697 NUMBER COMMA NUMBER 698 { 699 char *a, *p; 700 701 if ($1 < 0 || $1 > 255 || $3 < 0 || $3 > 255 || 702 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 703 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255) { 704 $$ = 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 $$ = 0; 713 } 714 } 715 ; 716 717 host_long_port4 718 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 719 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 720 NUMBER 721 { 722 char *a, *p; 723 724 /* reject invalid LPRT command */ 725 if ($1 != 4 || $3 != 4 || 726 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 727 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 || 728 $13 != 2 || 729 $15 < 0 || $15 > 255 || $17 < 0 || $17 > 255) { 730 $$ = 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 $$ = 0; 740 } 741 } 742 ; 743 744 host_long_port6 745 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 746 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 747 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 748 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 749 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 750 NUMBER 751 { 752 char *a, *p; 753 754 /* reject invalid LPRT command */ 755 if ($1 != 6 || $3 != 16 || 756 $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 || 757 $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 || 758 $13 < 0 || $13 > 255 || $15 < 0 || $15 > 255 || 759 $17 < 0 || $17 > 255 || $19 < 0 || $19 > 255 || 760 $21 < 0 || $21 > 255 || $23 < 0 || $23 > 255 || 761 $25 < 0 || $25 > 255 || $27 < 0 || $27 > 255 || 762 $29 < 0 || $29 > 255 || $31 < 0 || $31 > 255 || 763 $33 < 0 || $33 > 255 || $35 < 0 || $35 > 255 || 764 $37 != 2 || 765 $39 < 0 || $39 > 255 || $41 < 0 || $41 > 255) { 766 $$ = 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 $$ = 0; 789 } 790 } 791 ; 792 793 form_code 794 : N 795 { 796 $$ = FORM_N; 797 } 798 | T 799 { 800 $$ = FORM_T; 801 } 802 | C 803 { 804 $$ = FORM_C; 805 } 806 ; 807 808 type_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 ; 850 851 struct_code 852 : F 853 { 854 $$ = STRU_F; 855 } 856 | R 857 { 858 $$ = STRU_R; 859 } 860 | P 861 { 862 $$ = STRU_P; 863 } 864 ; 865 866 mode_code 867 : S 868 { 869 $$ = MODE_S; 870 } 871 | B 872 { 873 $$ = MODE_B; 874 } 875 | C 876 { 877 $$ = MODE_C; 878 } 879 ; 880 881 pathname 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 $$ = $1; 917 } 918 ; 919 920 pathstring 921 : STRING 922 ; 923 924 octal_number 925 : NUMBER 926 { 927 int ret, dec, multby, digit; 928 929 /* 930 * Convert a number that was read as decimal number 931 * to what it would be if it had been read as octal. 932 */ 933 dec = $1; 934 multby = 1; 935 ret = 0; 936 while (dec) { 937 digit = dec%10; 938 if (digit > 7) { 939 ret = -1; 940 break; 941 } 942 ret += digit * multby; 943 multby *= 8; 944 dec /= 10; 945 } 946 $$ = ret; 947 } 948 ; 949 950 951 check_login 952 : /* empty */ 953 { 954 if (logged_in) 955 $$ = 1; 956 else { 957 reply(530, "Please login with USER and PASS."); 958 $$ = 0; 959 state = 0; 960 YYABORT; 961 } 962 } 963 ; 964 965 check_login_epsvall 966 : /* empty */ 967 { 968 if (!logged_in) { 969 reply(530, "Please login with USER and PASS."); 970 $$ = 0; 971 state = 0; 972 YYABORT; 973 } else if (epsvall) { 974 reply(501, "the command is disallowed " 975 "after EPSV ALL"); 976 usedefault = 1; 977 $$ = 0; 978 } else 979 $$ = 1; 980 } 981 ; 982 983 %% 984 985 #define CMD 0 /* beginning of command */ 986 #define ARGS 1 /* expect miscellaneous arguments */ 987 #define STR1 2 /* expect SP followed by STRING */ 988 #define STR2 3 /* expect STRING */ 989 #define OSTR 4 /* optional SP then STRING */ 990 #define ZSTR1 5 /* SP then optional STRING */ 991 #define ZSTR2 6 /* optional STRING after SP */ 992 #define SITECMD 7 /* SITE command */ 993 #define NSTR 8 /* Number followed by a string */ 994 995 struct tab { 996 char *name; 997 short token; 998 short state; 999 short implemented; /* 1 if command is implemented */ 1000 char *help; 1001 }; 1002 1003 struct tab cmdtab[] = { /* In order defined in RFC 765 */ 1004 { "USER", USER, STR1, 1, "<sp> username" }, 1005 { "PASS", PASS, ZSTR1, 1, "<sp> password" }, 1006 { "ACCT", ACCT, STR1, 0, "(specify account)" }, 1007 { "SMNT", SMNT, ARGS, 0, "(structure mount)" }, 1008 { "REIN", REIN, ARGS, 0, "(reinitialize server state)" }, 1009 { "QUIT", QUIT, ARGS, 1, "(terminate service)", }, 1010 { "PORT", PORT, ARGS, 1, "<sp> b0, b1, b2, b3, b4" }, 1011 { "LPRT", LPRT, ARGS, 1, "<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." }, 1012 { "EPRT", EPRT, STR1, 1, "<sp> |af|addr|port|" }, 1013 { "PASV", PASV, ARGS, 1, "(set server in passive mode)" }, 1014 { "LPSV", LPSV, ARGS, 1, "(set server in passive mode)" }, 1015 { "EPSV", EPSV, ARGS, 1, "[<sp> af|ALL]" }, 1016 { "TYPE", TYPE, ARGS, 1, "<sp> [ A | E | I | L ]" }, 1017 { "STRU", STRU, ARGS, 1, "(specify file structure)" }, 1018 { "MODE", MODE, ARGS, 1, "(specify transfer mode)" }, 1019 { "RETR", RETR, STR1, 1, "<sp> file-name" }, 1020 { "STOR", STOR, STR1, 1, "<sp> file-name" }, 1021 { "APPE", APPE, STR1, 1, "<sp> file-name" }, 1022 { "MLFL", MLFL, OSTR, 0, "(mail file)" }, 1023 { "MAIL", MAIL, OSTR, 0, "(mail to user)" }, 1024 { "MSND", MSND, OSTR, 0, "(mail send to terminal)" }, 1025 { "MSOM", MSOM, OSTR, 0, "(mail send to terminal or mailbox)" }, 1026 { "MSAM", MSAM, OSTR, 0, "(mail send to terminal and mailbox)" }, 1027 { "MRSQ", MRSQ, OSTR, 0, "(mail recipient scheme question)" }, 1028 { "MRCP", MRCP, STR1, 0, "(mail recipient)" }, 1029 { "ALLO", ALLO, ARGS, 1, "allocate storage (vacuously)" }, 1030 { "REST", REST, ARGS, 1, "<sp> offset (restart command)" }, 1031 { "RNFR", RNFR, STR1, 1, "<sp> file-name" }, 1032 { "RNTO", RNTO, STR1, 1, "<sp> file-name" }, 1033 { "ABOR", ABOR, ARGS, 1, "(abort operation)" }, 1034 { "DELE", DELE, STR1, 1, "<sp> file-name" }, 1035 { "CWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1036 { "XCWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1037 { "LIST", LIST, OSTR, 1, "[ <sp> path-name ]" }, 1038 { "NLST", NLST, OSTR, 1, "[ <sp> path-name ]" }, 1039 { "SITE", SITE, SITECMD, 1, "site-cmd [ <sp> arguments ]" }, 1040 { "SYST", SYST, ARGS, 1, "(get type of operating system)" }, 1041 { "STAT", STAT, OSTR, 1, "[ <sp> path-name ]" }, 1042 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1043 { "NOOP", NOOP, ARGS, 1, "" }, 1044 { "MKD", MKD, STR1, 1, "<sp> path-name" }, 1045 { "XMKD", MKD, STR1, 1, "<sp> path-name" }, 1046 { "RMD", RMD, STR1, 1, "<sp> path-name" }, 1047 { "XRMD", RMD, STR1, 1, "<sp> path-name" }, 1048 { "PWD", PWD, ARGS, 1, "(return current directory)" }, 1049 { "XPWD", PWD, ARGS, 1, "(return current directory)" }, 1050 { "CDUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1051 { "XCUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1052 { "STOU", STOU, STR1, 1, "<sp> file-name" }, 1053 { "SIZE", SIZE, OSTR, 1, "<sp> path-name" }, 1054 { "MDTM", MDTM, OSTR, 1, "<sp> path-name" }, 1055 { NULL, 0, 0, 0, 0 } 1056 }; 1057 1058 struct tab sitetab[] = { 1059 { "UMASK", UMASK, ARGS, 1, "[ <sp> umask ]" }, 1060 { "IDLE", IDLE, ARGS, 1, "[ <sp> maximum-idle-time ]" }, 1061 { "CHMOD", CHMOD, NSTR, 1, "<sp> mode <sp> file-name" }, 1062 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1063 { NULL, 0, 0, 0, 0 } 1064 }; 1065 1066 static void help(struct tab *, char *); 1067 static struct tab * 1068 lookup(struct tab *, const char *); 1069 static void sizecmd(const char *); 1070 static int yylex(void); 1071 1072 extern int epsvall; 1073 1074 static struct tab * 1075 lookup(struct tab *p, const char *cmd) 1076 { 1077 1078 for (; p->name != NULL; p++) 1079 if (strcmp(cmd, p->name) == 0) 1080 return (p); 1081 return (NULL); 1082 } 1083 1084 #include <arpa/telnet.h> 1085 1086 /* 1087 * get_line - a hacked up version of fgets to ignore TELNET escape codes. 1088 */ 1089 int 1090 get_line(char *s, int n) 1091 { 1092 int c; 1093 char *cs; 1094 1095 cs = s; 1096 /* tmpline may contain saved command from urgent mode interruption */ 1097 for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) { 1098 *cs++ = tmpline[c]; 1099 if (tmpline[c] == '\n') { 1100 *cs++ = '\0'; 1101 if (debug) 1102 syslog(LOG_DEBUG, "command: %s", s); 1103 tmpline[0] = '\0'; 1104 return(0); 1105 } 1106 if (c == 0) 1107 tmpline[0] = '\0'; 1108 } 1109 while ((c = getc(stdin)) != EOF) { 1110 c &= 0377; 1111 if (c == IAC) { 1112 if ((c = getc(stdin)) != EOF) { 1113 c &= 0377; 1114 switch (c) { 1115 case WILL: 1116 case WONT: 1117 c = getc(stdin); 1118 printf("%c%c%c", IAC, DONT, 0377&c); 1119 (void) fflush(stdout); 1120 continue; 1121 case DO: 1122 case DONT: 1123 c = getc(stdin); 1124 printf("%c%c%c", IAC, WONT, 0377&c); 1125 (void) fflush(stdout); 1126 continue; 1127 case IAC: 1128 break; 1129 default: 1130 continue; /* ignore command */ 1131 } 1132 } 1133 } 1134 *cs++ = c; 1135 if (--n <= 0) { 1136 /* 1137 * If command doesn't fit into buffer, discard the 1138 * rest of the command and indicate truncation. 1139 * This prevents the command to be split up into 1140 * multiple commands. 1141 */ 1142 while (c != '\n' && (c = getc(stdin)) != EOF) 1143 ; 1144 return (-2); 1145 } 1146 if (c == '\n') 1147 break; 1148 } 1149 if (c == EOF && cs == s) 1150 return (-1); 1151 *cs++ = '\0'; 1152 if (debug) { 1153 if (!guest && strncasecmp("pass ", s, 5) == 0) { 1154 /* Don't syslog passwords */ 1155 syslog(LOG_DEBUG, "command: %.5s ???", s); 1156 } else { 1157 char *cp; 1158 int len; 1159 1160 /* Don't syslog trailing CR-LF */ 1161 len = strlen(s); 1162 cp = s + len - 1; 1163 while (cp >= s && (*cp == '\n' || *cp == '\r')) { 1164 --cp; 1165 --len; 1166 } 1167 syslog(LOG_DEBUG, "command: %.*s", len, s); 1168 } 1169 } 1170 return (0); 1171 } 1172 1173 /*ARGSUSED*/ 1174 void 1175 toolong(int signo) 1176 { 1177 struct syslog_data sdata = SYSLOG_DATA_INIT; 1178 1179 reply_r(421, 1180 "Timeout (%d seconds): closing control connection.", timeout); 1181 if (logging) 1182 syslog_r(LOG_INFO, &sdata, "User %s timed out after %d seconds", 1183 (pw ? pw -> pw_name : "unknown"), timeout); 1184 dologout(1); 1185 } 1186 1187 static int 1188 yylex(void) 1189 { 1190 static int cpos; 1191 char *cp, *cp2; 1192 struct tab *p; 1193 int n; 1194 char c; 1195 1196 for (;;) { 1197 switch (state) { 1198 1199 case CMD: 1200 (void) alarm((unsigned) timeout); 1201 n = get_line(cbuf, sizeof(cbuf)-1); 1202 if (n == -1) { 1203 reply(221, "You could at least say goodbye."); 1204 dologout(0); 1205 } else if (n == -2) { 1206 reply(500, "Command too long."); 1207 alarm(0); 1208 continue; 1209 } 1210 (void) alarm(0); 1211 if ((cp = strchr(cbuf, '\r'))) { 1212 *cp++ = '\n'; 1213 *cp = '\0'; 1214 } 1215 if (strncasecmp(cbuf, "PASS", 4) != 0) { 1216 if ((cp = strpbrk(cbuf, "\n"))) { 1217 c = *cp; 1218 *cp = '\0'; 1219 setproctitle("%s: %s", proctitle, cbuf); 1220 *cp = c; 1221 } 1222 } 1223 if ((cp = strpbrk(cbuf, " \n"))) 1224 cpos = cp - cbuf; 1225 if (cpos == 0) 1226 cpos = 4; 1227 c = cbuf[cpos]; 1228 cbuf[cpos] = '\0'; 1229 upper(cbuf); 1230 p = lookup(cmdtab, cbuf); 1231 cbuf[cpos] = c; 1232 if (p != NULL) { 1233 if (p->implemented == 0) { 1234 nack(p->name); 1235 return (LEXERR); 1236 } 1237 state = p->state; 1238 yylval.s = p->name; 1239 return (p->token); 1240 } 1241 break; 1242 1243 case SITECMD: 1244 if (cbuf[cpos] == ' ') { 1245 cpos++; 1246 return (SP); 1247 } 1248 cp = &cbuf[cpos]; 1249 if ((cp2 = strpbrk(cp, " \n"))) 1250 cpos = cp2 - cbuf; 1251 c = cbuf[cpos]; 1252 cbuf[cpos] = '\0'; 1253 upper(cp); 1254 p = lookup(sitetab, cp); 1255 cbuf[cpos] = c; 1256 if (p != NULL) { 1257 if (p->implemented == 0) { 1258 state = CMD; 1259 nack(p->name); 1260 return (LEXERR); 1261 } 1262 state = p->state; 1263 yylval.s = p->name; 1264 return (p->token); 1265 } 1266 state = CMD; 1267 break; 1268 1269 case OSTR: 1270 if (cbuf[cpos] == '\n') { 1271 state = CMD; 1272 return (CRLF); 1273 } 1274 /* FALLTHROUGH */ 1275 1276 case STR1: 1277 case ZSTR1: 1278 dostr1: 1279 if (cbuf[cpos] == ' ') { 1280 cpos++; 1281 state = state == OSTR ? STR2 : state+1; 1282 return (SP); 1283 } 1284 break; 1285 1286 case ZSTR2: 1287 if (cbuf[cpos] == '\n') { 1288 state = CMD; 1289 return (CRLF); 1290 } 1291 /* FALLTHROUGH */ 1292 1293 case STR2: 1294 cp = &cbuf[cpos]; 1295 n = strlen(cp); 1296 cpos += n - 1; 1297 /* 1298 * Make sure the string is nonempty and \n terminated. 1299 */ 1300 if (n > 1 && cbuf[cpos] == '\n') { 1301 cbuf[cpos] = '\0'; 1302 yylval.s = strdup(cp); 1303 if (yylval.s == NULL) 1304 fatal("Ran out of memory."); 1305 cbuf[cpos] = '\n'; 1306 state = ARGS; 1307 return (STRING); 1308 } 1309 break; 1310 1311 case NSTR: 1312 if (cbuf[cpos] == ' ') { 1313 cpos++; 1314 return (SP); 1315 } 1316 if (isdigit((unsigned char)cbuf[cpos])) { 1317 cp = &cbuf[cpos]; 1318 while (isdigit((unsigned char)cbuf[++cpos])) 1319 ; 1320 c = cbuf[cpos]; 1321 cbuf[cpos] = '\0'; 1322 yylval.i = atoi(cp); 1323 cbuf[cpos] = c; 1324 state = STR1; 1325 return (NUMBER); 1326 } 1327 state = STR1; 1328 goto dostr1; 1329 1330 case ARGS: 1331 if (isdigit((unsigned char)cbuf[cpos])) { 1332 long long llval; 1333 1334 cp = &cbuf[cpos]; 1335 errno = 0; 1336 llval = strtoll(cp, &cp2, 10); 1337 if (llval < 0 || 1338 (errno == ERANGE && llval == LLONG_MAX)) 1339 break; 1340 1341 cpos = (int)(cp2 - cbuf); 1342 if (llval > INT_MAX) { 1343 yylval.o = llval; 1344 return (BIGNUM); 1345 } else { 1346 yylval.i = (int)llval; 1347 return (NUMBER); 1348 } 1349 } 1350 if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 && 1351 !isalnum((unsigned char)cbuf[cpos + 3])) { 1352 cpos += 3; 1353 return ALL; 1354 } 1355 switch (cbuf[cpos++]) { 1356 1357 case '\n': 1358 state = CMD; 1359 return (CRLF); 1360 1361 case ' ': 1362 return (SP); 1363 1364 case ',': 1365 return (COMMA); 1366 1367 case 'A': 1368 case 'a': 1369 return (A); 1370 1371 case 'B': 1372 case 'b': 1373 return (B); 1374 1375 case 'C': 1376 case 'c': 1377 return (C); 1378 1379 case 'E': 1380 case 'e': 1381 return (E); 1382 1383 case 'F': 1384 case 'f': 1385 return (F); 1386 1387 case 'I': 1388 case 'i': 1389 return (I); 1390 1391 case 'L': 1392 case 'l': 1393 return (L); 1394 1395 case 'N': 1396 case 'n': 1397 return (N); 1398 1399 case 'P': 1400 case 'p': 1401 return (P); 1402 1403 case 'R': 1404 case 'r': 1405 return (R); 1406 1407 case 'S': 1408 case 's': 1409 return (S); 1410 1411 case 'T': 1412 case 't': 1413 return (T); 1414 1415 } 1416 break; 1417 1418 default: 1419 fatal("Unknown state in scanner."); 1420 } 1421 state = CMD; 1422 return (LEXERR); 1423 } 1424 } 1425 1426 void 1427 upper(char *s) 1428 { 1429 char *p; 1430 1431 for (p = s; *p; p++) 1432 *p = (char)toupper((unsigned char)*p); 1433 } 1434 1435 static void 1436 help(struct tab *ctab, char *s) 1437 { 1438 struct tab *c; 1439 int width, NCMDS; 1440 char *type; 1441 1442 if (ctab == sitetab) 1443 type = "SITE "; 1444 else 1445 type = ""; 1446 width = 0, NCMDS = 0; 1447 for (c = ctab; c->name != NULL; c++) { 1448 int len = strlen(c->name); 1449 1450 if (len > width) 1451 width = len; 1452 NCMDS++; 1453 } 1454 width = (width + 8) &~ 7; 1455 if (s == NULL) { 1456 int i, j, w; 1457 int columns, lines; 1458 1459 lreply(214, "The following %scommands are recognized %s.", 1460 type, "(* =>'s unimplemented)"); 1461 columns = 76 / width; 1462 if (columns == 0) 1463 columns = 1; 1464 lines = (NCMDS + columns - 1) / columns; 1465 for (i = 0; i < lines; i++) { 1466 printf(" "); 1467 for (j = 0; j < columns; j++) { 1468 c = ctab + j * lines + i; 1469 printf("%s%c", c->name, 1470 c->implemented ? ' ' : '*'); 1471 if (c + lines >= &ctab[NCMDS]) 1472 break; 1473 w = strlen(c->name) + 1; 1474 while (w < width) { 1475 putchar(' '); 1476 w++; 1477 } 1478 } 1479 printf("\r\n"); 1480 } 1481 (void) fflush(stdout); 1482 reply(214, "Direct comments to ftp-bugs@%s.", hostname); 1483 return; 1484 } 1485 upper(s); 1486 c = lookup(ctab, s); 1487 if (c == NULL) { 1488 reply(502, "Unknown command %s.", s); 1489 return; 1490 } 1491 if (c->implemented) 1492 reply(214, "Syntax: %s%s %s", type, c->name, c->help); 1493 else 1494 reply(214, "%s%-*s\t%s; unimplemented.", type, width, 1495 c->name, c->help); 1496 } 1497 1498 static void 1499 sizecmd(const char *filename) 1500 { 1501 switch (type) { 1502 case TYPE_L: 1503 case TYPE_I: { 1504 struct stat stbuf; 1505 if (stat(filename, &stbuf) == -1 || !S_ISREG(stbuf.st_mode)) 1506 reply(550, "%s: not a plain file.", filename); 1507 else 1508 reply(213, "%lld", (long long)stbuf.st_size); 1509 break; } 1510 case TYPE_A: { 1511 FILE *fin; 1512 int c; 1513 off_t count; 1514 struct stat stbuf; 1515 fin = fopen(filename, "r"); 1516 if (fin == NULL) { 1517 perror_reply(550, filename); 1518 return; 1519 } 1520 if (fstat(fileno(fin), &stbuf) == -1 || !S_ISREG(stbuf.st_mode)) { 1521 reply(550, "%s: not a plain file.", filename); 1522 (void) fclose(fin); 1523 return; 1524 } 1525 if (stbuf.st_size > 10240) { 1526 reply(550, "%s: file too large for SIZE.", filename); 1527 (void) fclose(fin); 1528 return; 1529 } 1530 1531 count = 0; 1532 while((c = getc(fin)) != EOF) { 1533 if (c == '\n') /* will get expanded to \r\n */ 1534 count++; 1535 count++; 1536 } 1537 (void) fclose(fin); 1538 1539 reply(213, "%lld", (long long)count); 1540 break; } 1541 default: 1542 reply(504, "SIZE not implemented for Type %c.", "?AEIL"[type]); 1543 } 1544 } 1545