1 /* 2 * Copyright (c) 1985, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ftpcmd.y 8.3 (Berkeley) 4/6/94 34 */ 35 36 /* 37 * Grammar for FTP commands. 38 * See RFC 959. 39 */ 40 41 %{ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)ftpcmd.y 8.3 (Berkeley) 4/6/94"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/socket.h> 53 #include <sys/stat.h> 54 55 #include <netinet/in.h> 56 #include <arpa/ftp.h> 57 58 #include <ctype.h> 59 #include <errno.h> 60 #include <glob.h> 61 #include <libutil.h> 62 #include <limits.h> 63 #include <md5.h> 64 #include <netdb.h> 65 #include <pwd.h> 66 #include <signal.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <time.h> 72 #include <unistd.h> 73 74 #include "extern.h" 75 #include "pathnames.h" 76 77 extern union sockunion data_dest, his_addr; 78 extern int hostinfo; 79 extern int logged_in; 80 extern struct passwd *pw; 81 extern int guest; 82 extern char *homedir; 83 extern int paranoid; 84 extern int logging; 85 extern int type; 86 extern int form; 87 extern int ftpdebug; 88 extern int timeout; 89 extern int maxtimeout; 90 extern int pdata; 91 extern char *hostname; 92 extern char proctitle[]; 93 extern int usedefault; 94 extern char tmpline[]; 95 extern int readonly; 96 extern int noepsv; 97 extern int noretr; 98 extern int noguestretr; 99 extern char *typenames[]; /* defined in <arpa/ftp.h> included from ftpd.c */ 100 101 off_t restart_point; 102 103 static int cmd_type; 104 static int cmd_form; 105 static int cmd_bytesz; 106 static int state; 107 char cbuf[512]; 108 char *fromname = (char *) 0; 109 110 extern int epsvall; 111 112 %} 113 114 %union { 115 struct { 116 off_t o; 117 int i; 118 } u; 119 char *s; 120 } 121 122 %token 123 A B C E F I 124 L N P R S T 125 ALL 126 127 SP CRLF COMMA 128 129 USER PASS ACCT REIN QUIT PORT 130 PASV TYPE STRU MODE RETR STOR 131 APPE MLFL MAIL MSND MSOM MSAM 132 MRSQ MRCP ALLO REST RNFR RNTO 133 ABOR DELE CWD LIST NLST SITE 134 STAT HELP NOOP MKD RMD PWD 135 CDUP STOU SMNT SYST SIZE MDTM 136 LPRT LPSV EPRT EPSV 137 138 UMASK IDLE CHMOD MDFIVE 139 140 LEXERR NOTIMPL 141 142 %token <s> STRING 143 %token <u> NUMBER 144 145 %type <u.i> check_login octal_number byte_size 146 %type <u.i> check_login_ro check_login_epsv 147 %type <u.i> struct_code mode_code type_code form_code 148 %type <s> pathstring pathname password username 149 %type <s> ALL NOTIMPL 150 151 %start cmd_list 152 153 %% 154 155 cmd_list 156 : /* empty */ 157 | cmd_list cmd 158 { 159 if (fromname) 160 free(fromname); 161 fromname = (char *) 0; 162 restart_point = (off_t) 0; 163 } 164 | cmd_list rcmd 165 ; 166 167 cmd 168 : USER SP username CRLF 169 { 170 user($3); 171 free($3); 172 } 173 | PASS SP password CRLF 174 { 175 pass($3); 176 free($3); 177 } 178 | PASS CRLF 179 { 180 pass(""); 181 } 182 | PORT check_login SP host_port CRLF 183 { 184 if (epsvall) { 185 reply(501, "no PORT allowed after EPSV ALL"); 186 goto port_done; 187 } 188 if (!$2) 189 goto port_done; 190 if (port_check("PORT") == 1) 191 goto port_done; 192 #ifdef INET6 193 if ((his_addr.su_family != AF_INET6 || 194 !IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))) { 195 /* shoud never happen */ 196 usedefault = 1; 197 reply(500, "Invalid address rejected."); 198 goto port_done; 199 } 200 port_check_v6("pcmd"); 201 #endif 202 port_done: 203 } 204 | LPRT check_login SP host_long_port CRLF 205 { 206 if (epsvall) { 207 reply(501, "no LPRT allowed after EPSV ALL"); 208 goto lprt_done; 209 } 210 if (!$2) 211 goto lprt_done; 212 if (port_check("LPRT") == 1) 213 goto lprt_done; 214 #ifdef INET6 215 if (his_addr.su_family != AF_INET6) { 216 usedefault = 1; 217 reply(500, "Invalid address rejected."); 218 goto lprt_done; 219 } 220 if (port_check_v6("LPRT") == 1) 221 goto lprt_done; 222 #endif 223 lprt_done: 224 } 225 | EPRT check_login SP STRING CRLF 226 { 227 char delim; 228 char *tmp = NULL; 229 char *p, *q; 230 char *result[3]; 231 struct addrinfo hints; 232 struct addrinfo *res; 233 int i; 234 235 if (epsvall) { 236 reply(501, "no EPRT allowed after EPSV ALL"); 237 goto eprt_done; 238 } 239 if (!$2) 240 goto eprt_done; 241 242 memset(&data_dest, 0, sizeof(data_dest)); 243 tmp = strdup($4); 244 if (ftpdebug) 245 syslog(LOG_DEBUG, "%s", tmp); 246 if (!tmp) { 247 fatalerror("not enough core"); 248 /*NOTREACHED*/ 249 } 250 p = tmp; 251 delim = p[0]; 252 p++; 253 memset(result, 0, sizeof(result)); 254 for (i = 0; i < 3; i++) { 255 q = strchr(p, delim); 256 if (!q || *q != delim) { 257 parsefail: 258 reply(500, 259 "Invalid argument, rejected."); 260 if (tmp) 261 free(tmp); 262 usedefault = 1; 263 goto eprt_done; 264 } 265 *q++ = '\0'; 266 result[i] = p; 267 if (ftpdebug) 268 syslog(LOG_DEBUG, "%d: %s", i, p); 269 p = q; 270 } 271 272 /* some more sanity check */ 273 p = result[0]; 274 while (*p) { 275 if (!isdigit(*p)) 276 goto parsefail; 277 p++; 278 } 279 p = result[2]; 280 while (*p) { 281 if (!isdigit(*p)) 282 goto parsefail; 283 p++; 284 } 285 286 /* grab address */ 287 memset(&hints, 0, sizeof(hints)); 288 if (atoi(result[0]) == 1) 289 hints.ai_family = PF_INET; 290 #ifdef INET6 291 else if (atoi(result[0]) == 2) 292 hints.ai_family = PF_INET6; 293 #endif 294 else 295 hints.ai_family = PF_UNSPEC; /*XXX*/ 296 hints.ai_socktype = SOCK_STREAM; 297 i = getaddrinfo(result[1], result[2], &hints, &res); 298 if (i) 299 goto parsefail; 300 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 301 #ifdef INET6 302 if (his_addr.su_family == AF_INET6 303 && data_dest.su_family == AF_INET6) { 304 /* XXX more sanity checks! */ 305 data_dest.su_sin6.sin6_scope_id = 306 his_addr.su_sin6.sin6_scope_id; 307 } 308 #endif 309 free(tmp); 310 tmp = NULL; 311 312 if (port_check("EPRT") == 1) 313 goto eprt_done; 314 #ifdef INET6 315 if (his_addr.su_family != AF_INET6) { 316 usedefault = 1; 317 reply(500, "Invalid address rejected."); 318 goto eprt_done; 319 } 320 if (port_check_v6("EPRT") == 1) 321 goto eprt_done; 322 #endif 323 eprt_done: 324 free($4); 325 } 326 | PASV check_login CRLF 327 { 328 if (epsvall) 329 reply(501, "no PASV allowed after EPSV ALL"); 330 else if ($2) 331 passive(); 332 } 333 | LPSV check_login CRLF 334 { 335 if (epsvall) 336 reply(501, "no LPSV allowed after EPSV ALL"); 337 else if ($2) 338 long_passive("LPSV", PF_UNSPEC); 339 } 340 | EPSV check_login_epsv SP NUMBER CRLF 341 { 342 if ($2) { 343 int pf; 344 switch ($4.i) { 345 case 1: 346 pf = PF_INET; 347 break; 348 #ifdef INET6 349 case 2: 350 pf = PF_INET6; 351 break; 352 #endif 353 default: 354 pf = -1; /*junk value*/ 355 break; 356 } 357 long_passive("EPSV", pf); 358 } 359 } 360 | EPSV check_login_epsv SP ALL CRLF 361 { 362 if ($2) { 363 reply(200, 364 "EPSV ALL command successful."); 365 epsvall++; 366 } 367 } 368 | EPSV check_login_epsv CRLF 369 { 370 if ($2) 371 long_passive("EPSV", PF_UNSPEC); 372 } 373 | TYPE check_login SP type_code CRLF 374 { 375 if ($2) { 376 switch (cmd_type) { 377 378 case TYPE_A: 379 if (cmd_form == FORM_N) { 380 reply(200, "Type set to A."); 381 type = cmd_type; 382 form = cmd_form; 383 } else 384 reply(504, "Form must be N."); 385 break; 386 387 case TYPE_E: 388 reply(504, "Type E not implemented."); 389 break; 390 391 case TYPE_I: 392 reply(200, "Type set to I."); 393 type = cmd_type; 394 break; 395 396 case TYPE_L: 397 #if CHAR_BIT == 8 398 if (cmd_bytesz == 8) { 399 reply(200, 400 "Type set to L (byte size 8)."); 401 type = cmd_type; 402 } else 403 reply(504, "Byte size must be 8."); 404 #else /* CHAR_BIT == 8 */ 405 UNIMPLEMENTED for CHAR_BIT != 8 406 #endif /* CHAR_BIT == 8 */ 407 } 408 } 409 } 410 | STRU check_login SP struct_code CRLF 411 { 412 if ($2) { 413 switch ($4) { 414 415 case STRU_F: 416 reply(200, "STRU F ok."); 417 break; 418 419 default: 420 reply(504, "Unimplemented STRU type."); 421 } 422 } 423 } 424 | MODE check_login SP mode_code CRLF 425 { 426 if ($2) { 427 switch ($4) { 428 429 case MODE_S: 430 reply(200, "MODE S ok."); 431 break; 432 433 default: 434 reply(502, "Unimplemented MODE type."); 435 } 436 } 437 } 438 | ALLO check_login SP NUMBER CRLF 439 { 440 if ($2) { 441 reply(202, "ALLO command ignored."); 442 } 443 } 444 | ALLO check_login SP NUMBER SP R SP NUMBER CRLF 445 { 446 if ($2) { 447 reply(202, "ALLO command ignored."); 448 } 449 } 450 | RETR check_login SP pathname CRLF 451 { 452 if (noretr || (guest && noguestretr)) 453 reply(500, "RETR command is disabled"); 454 else if ($2 && $4 != NULL) 455 retrieve((char *) 0, $4); 456 457 if ($4 != NULL) 458 free($4); 459 } 460 | STOR check_login_ro SP pathname CRLF 461 { 462 if ($2 && $4 != NULL) 463 store($4, "w", 0); 464 if ($4 != NULL) 465 free($4); 466 } 467 | APPE check_login_ro SP pathname CRLF 468 { 469 if ($2 && $4 != NULL) 470 store($4, "a", 0); 471 if ($4 != NULL) 472 free($4); 473 } 474 | NLST check_login CRLF 475 { 476 if ($2) 477 send_file_list("."); 478 } 479 | NLST check_login SP pathstring CRLF 480 { 481 if ($2) 482 send_file_list($4); 483 free($4); 484 } 485 | LIST check_login CRLF 486 { 487 if ($2) 488 retrieve(_PATH_LS " -lgA", ""); 489 } 490 | LIST check_login SP pathstring CRLF 491 { 492 if ($2) 493 retrieve(_PATH_LS " -lgA %s", $4); 494 free($4); 495 } 496 | STAT check_login SP pathname CRLF 497 { 498 if ($2 && $4 != NULL) 499 statfilecmd($4); 500 if ($4 != NULL) 501 free($4); 502 } 503 | STAT check_login CRLF 504 { 505 if ($2) { 506 statcmd(); 507 } 508 } 509 | DELE check_login_ro SP pathname CRLF 510 { 511 if ($2 && $4 != NULL) 512 delete($4); 513 if ($4 != NULL) 514 free($4); 515 } 516 | RNTO check_login_ro SP pathname CRLF 517 { 518 if ($2 && $4 != NULL) { 519 if (fromname) { 520 renamecmd(fromname, $4); 521 free(fromname); 522 fromname = (char *) 0; 523 } else { 524 reply(503, "Bad sequence of commands."); 525 } 526 } 527 if ($4 != NULL) 528 free($4); 529 } 530 | ABOR check_login CRLF 531 { 532 if ($2) 533 reply(225, "ABOR command successful."); 534 } 535 | CWD check_login CRLF 536 { 537 if ($2) { 538 cwd(homedir); 539 } 540 } 541 | CWD check_login SP pathname CRLF 542 { 543 if ($2 && $4 != NULL) 544 cwd($4); 545 if ($4 != NULL) 546 free($4); 547 } 548 | HELP CRLF 549 { 550 help(cmdtab, (char *) 0); 551 } 552 | HELP SP STRING CRLF 553 { 554 char *cp = $3; 555 556 if (strncasecmp(cp, "SITE", 4) == 0) { 557 cp = $3 + 4; 558 if (*cp == ' ') 559 cp++; 560 if (*cp) 561 help(sitetab, cp); 562 else 563 help(sitetab, (char *) 0); 564 } else 565 help(cmdtab, $3); 566 free($3); 567 } 568 | NOOP CRLF 569 { 570 reply(200, "NOOP command successful."); 571 } 572 | MKD check_login_ro SP pathname CRLF 573 { 574 if ($2 && $4 != NULL) 575 makedir($4); 576 if ($4 != NULL) 577 free($4); 578 } 579 | RMD check_login_ro SP pathname CRLF 580 { 581 if ($2 && $4 != NULL) 582 removedir($4); 583 if ($4 != NULL) 584 free($4); 585 } 586 | PWD check_login CRLF 587 { 588 if ($2) 589 pwd(); 590 } 591 | CDUP check_login CRLF 592 { 593 if ($2) 594 cwd(".."); 595 } 596 | SITE SP HELP CRLF 597 { 598 help(sitetab, (char *) 0); 599 } 600 | SITE SP HELP SP STRING CRLF 601 { 602 help(sitetab, $5); 603 free($5); 604 } 605 | SITE SP MDFIVE check_login SP pathname CRLF 606 { 607 char p[64], *q; 608 609 if ($4 && $6) { 610 q = MD5File($6, p); 611 if (q != NULL) 612 reply(200, "MD5(%s) = %s", $6, p); 613 else 614 perror_reply(550, $6); 615 } 616 if ($6) 617 free($6); 618 } 619 | SITE SP UMASK check_login CRLF 620 { 621 int oldmask; 622 623 if ($4) { 624 oldmask = umask(0); 625 (void) umask(oldmask); 626 reply(200, "Current UMASK is %03o", oldmask); 627 } 628 } 629 | SITE SP UMASK check_login SP octal_number CRLF 630 { 631 int oldmask; 632 633 if ($4) { 634 if (($6 == -1) || ($6 > 0777)) { 635 reply(501, "Bad UMASK value"); 636 } else { 637 oldmask = umask($6); 638 reply(200, 639 "UMASK set to %03o (was %03o)", 640 $6, oldmask); 641 } 642 } 643 } 644 | SITE SP CHMOD check_login_ro SP octal_number SP pathname CRLF 645 { 646 if ($4 && ($8 != NULL)) { 647 if (($6 == -1 ) || ($6 > 0777)) 648 reply(501, "Bad mode value"); 649 else if (chmod($8, $6) < 0) 650 perror_reply(550, $8); 651 else 652 reply(200, "CHMOD command successful."); 653 } 654 if ($8 != NULL) 655 free($8); 656 } 657 | SITE SP check_login IDLE CRLF 658 { 659 if ($3) 660 reply(200, 661 "Current IDLE time limit is %d seconds; max %d", 662 timeout, maxtimeout); 663 } 664 | SITE SP check_login IDLE SP NUMBER CRLF 665 { 666 if ($3) { 667 if ($6.i < 30 || $6.i > maxtimeout) { 668 reply(501, 669 "Maximum IDLE time must be between 30 and %d seconds", 670 maxtimeout); 671 } else { 672 timeout = $6.i; 673 (void) alarm((unsigned) timeout); 674 reply(200, 675 "Maximum IDLE time set to %d seconds", 676 timeout); 677 } 678 } 679 } 680 | STOU check_login_ro SP pathname CRLF 681 { 682 if ($2 && $4 != NULL) 683 store($4, "w", 1); 684 if ($4 != NULL) 685 free($4); 686 } 687 | SYST check_login CRLF 688 { 689 if ($2) { 690 if (hostinfo) 691 #ifdef BSD 692 reply(215, "UNIX Type: L%d Version: BSD-%d", 693 CHAR_BIT, BSD); 694 #else /* BSD */ 695 reply(215, "UNIX Type: L%d", CHAR_BIT); 696 #endif /* BSD */ 697 else 698 reply(215, "UNKNOWN Type: L%d", CHAR_BIT); 699 } 700 } 701 702 /* 703 * SIZE is not in RFC959, but Postel has blessed it and 704 * it will be in the updated RFC. 705 * 706 * Return size of file in a format suitable for 707 * using with RESTART (we just count bytes). 708 */ 709 | SIZE check_login SP pathname CRLF 710 { 711 if ($2 && $4 != NULL) 712 sizecmd($4); 713 if ($4 != NULL) 714 free($4); 715 } 716 717 /* 718 * MDTM is not in RFC959, but Postel has blessed it and 719 * it will be in the updated RFC. 720 * 721 * Return modification time of file as an ISO 3307 722 * style time. E.g. YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx 723 * where xxx is the fractional second (of any precision, 724 * not necessarily 3 digits) 725 */ 726 | MDTM check_login SP pathname CRLF 727 { 728 if ($2 && $4 != NULL) { 729 struct stat stbuf; 730 if (stat($4, &stbuf) < 0) 731 reply(550, "%s: %s", 732 $4, strerror(errno)); 733 else if (!S_ISREG(stbuf.st_mode)) { 734 reply(550, "%s: not a plain file.", $4); 735 } else { 736 struct tm *t; 737 t = gmtime(&stbuf.st_mtime); 738 reply(213, 739 "%04d%02d%02d%02d%02d%02d", 740 1900 + t->tm_year, 741 t->tm_mon+1, t->tm_mday, 742 t->tm_hour, t->tm_min, t->tm_sec); 743 } 744 } 745 if ($4 != NULL) 746 free($4); 747 } 748 | QUIT CRLF 749 { 750 reply(221, "Goodbye."); 751 dologout(0); 752 } 753 | NOTIMPL 754 { 755 nack($1); 756 } 757 | error 758 { 759 yyclearin; /* discard lookahead data */ 760 yyerrok; /* clear error condition */ 761 state = CMD; /* reset lexer state */ 762 } 763 ; 764 rcmd 765 : RNFR check_login_ro SP pathname CRLF 766 { 767 restart_point = (off_t) 0; 768 if ($2 && $4) { 769 if (fromname) 770 free(fromname); 771 fromname = (char *) 0; 772 if (renamefrom($4)) 773 fromname = $4; 774 else 775 free($4); 776 } else if ($4) { 777 free($4); 778 } 779 } 780 | REST check_login SP NUMBER CRLF 781 { 782 if ($2) { 783 if (fromname) 784 free(fromname); 785 fromname = (char *) 0; 786 restart_point = $4.o; 787 reply(350, "Restarting at %llu. %s", 788 restart_point, 789 "Send STORE or RETRIEVE to initiate transfer."); 790 } 791 } 792 ; 793 794 username 795 : STRING 796 ; 797 798 password 799 : /* empty */ 800 { 801 $$ = (char *)calloc(1, sizeof(char)); 802 } 803 | STRING 804 ; 805 806 byte_size 807 : NUMBER 808 { 809 $$ = $1.i; 810 } 811 ; 812 813 host_port 814 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 815 NUMBER COMMA NUMBER 816 { 817 char *a, *p; 818 819 data_dest.su_len = sizeof(struct sockaddr_in); 820 data_dest.su_family = AF_INET; 821 p = (char *)&data_dest.su_sin.sin_port; 822 p[0] = $9.i; p[1] = $11.i; 823 a = (char *)&data_dest.su_sin.sin_addr; 824 a[0] = $1.i; a[1] = $3.i; a[2] = $5.i; a[3] = $7.i; 825 } 826 ; 827 828 host_long_port 829 : NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 830 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 831 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 832 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 833 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 834 NUMBER 835 { 836 char *a, *p; 837 838 memset(&data_dest, 0, sizeof(data_dest)); 839 data_dest.su_len = sizeof(struct sockaddr_in6); 840 data_dest.su_family = AF_INET6; 841 p = (char *)&data_dest.su_port; 842 p[0] = $39.i; p[1] = $41.i; 843 a = (char *)&data_dest.su_sin6.sin6_addr; 844 a[0] = $5.i; a[1] = $7.i; a[2] = $9.i; a[3] = $11.i; 845 a[4] = $13.i; a[5] = $15.i; a[6] = $17.i; a[7] = $19.i; 846 a[8] = $21.i; a[9] = $23.i; a[10] = $25.i; a[11] = $27.i; 847 a[12] = $29.i; a[13] = $31.i; a[14] = $33.i; a[15] = $35.i; 848 if (his_addr.su_family == AF_INET6) { 849 /* XXX more sanity checks! */ 850 data_dest.su_sin6.sin6_scope_id = 851 his_addr.su_sin6.sin6_scope_id; 852 } 853 if ($1.i != 6 || $3.i != 16 || $37.i != 2) 854 memset(&data_dest, 0, sizeof(data_dest)); 855 } 856 | NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 857 NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA 858 NUMBER 859 { 860 char *a, *p; 861 862 memset(&data_dest, 0, sizeof(data_dest)); 863 data_dest.su_sin.sin_len = sizeof(struct sockaddr_in); 864 data_dest.su_family = AF_INET; 865 p = (char *)&data_dest.su_port; 866 p[0] = $15.i; p[1] = $17.i; 867 a = (char *)&data_dest.su_sin.sin_addr; 868 a[0] = $5.i; a[1] = $7.i; a[2] = $9.i; a[3] = $11.i; 869 if ($1.i != 4 || $3.i != 4 || $13.i != 2) 870 memset(&data_dest, 0, sizeof(data_dest)); 871 } 872 ; 873 874 form_code 875 : N 876 { 877 $$ = FORM_N; 878 } 879 | T 880 { 881 $$ = FORM_T; 882 } 883 | C 884 { 885 $$ = FORM_C; 886 } 887 ; 888 889 type_code 890 : A 891 { 892 cmd_type = TYPE_A; 893 cmd_form = FORM_N; 894 } 895 | A SP form_code 896 { 897 cmd_type = TYPE_A; 898 cmd_form = $3; 899 } 900 | E 901 { 902 cmd_type = TYPE_E; 903 cmd_form = FORM_N; 904 } 905 | E SP form_code 906 { 907 cmd_type = TYPE_E; 908 cmd_form = $3; 909 } 910 | I 911 { 912 cmd_type = TYPE_I; 913 } 914 | L 915 { 916 cmd_type = TYPE_L; 917 cmd_bytesz = CHAR_BIT; 918 } 919 | L SP byte_size 920 { 921 cmd_type = TYPE_L; 922 cmd_bytesz = $3; 923 } 924 /* this is for a bug in the BBN ftp */ 925 | L byte_size 926 { 927 cmd_type = TYPE_L; 928 cmd_bytesz = $2; 929 } 930 ; 931 932 struct_code 933 : F 934 { 935 $$ = STRU_F; 936 } 937 | R 938 { 939 $$ = STRU_R; 940 } 941 | P 942 { 943 $$ = STRU_P; 944 } 945 ; 946 947 mode_code 948 : S 949 { 950 $$ = MODE_S; 951 } 952 | B 953 { 954 $$ = MODE_B; 955 } 956 | C 957 { 958 $$ = MODE_C; 959 } 960 ; 961 962 pathname 963 : pathstring 964 { 965 if (logged_in && $1) { 966 char *p; 967 968 /* 969 * Expand ~user manually since glob(3) 970 * will return the unexpanded pathname 971 * if the corresponding file/directory 972 * doesn't exist yet. Using sole glob(3) 973 * would break natural commands like 974 * MKD ~user/newdir 975 * or 976 * RNTO ~/newfile 977 */ 978 if ((p = exptilde($1)) != NULL) { 979 $$ = expglob(p); 980 free(p); 981 } else 982 $$ = NULL; 983 free($1); 984 } else 985 $$ = $1; 986 } 987 ; 988 989 pathstring 990 : STRING 991 ; 992 993 octal_number 994 : NUMBER 995 { 996 int ret, dec, multby, digit; 997 998 /* 999 * Convert a number that was read as decimal number 1000 * to what it would be if it had been read as octal. 1001 */ 1002 dec = $1.i; 1003 multby = 1; 1004 ret = 0; 1005 while (dec) { 1006 digit = dec%10; 1007 if (digit > 7) { 1008 ret = -1; 1009 break; 1010 } 1011 ret += digit * multby; 1012 multby *= 8; 1013 dec /= 10; 1014 } 1015 $$ = ret; 1016 } 1017 ; 1018 1019 1020 check_login 1021 : /* empty */ 1022 { 1023 $$ = check_login1(); 1024 } 1025 ; 1026 1027 check_login_epsv 1028 : /* empty */ 1029 { 1030 if (noepsv) { 1031 reply(500, "EPSV command disabled"); 1032 $$ = 0; 1033 } 1034 else 1035 $$ = check_login1(); 1036 } 1037 ; 1038 1039 check_login_ro 1040 : /* empty */ 1041 { 1042 if (readonly) { 1043 reply(550, "Permission denied."); 1044 $$ = 0; 1045 } 1046 else 1047 $$ = check_login1(); 1048 } 1049 ; 1050 1051 %% 1052 1053 #define CMD 0 /* beginning of command */ 1054 #define ARGS 1 /* expect miscellaneous arguments */ 1055 #define STR1 2 /* expect SP followed by STRING */ 1056 #define STR2 3 /* expect STRING */ 1057 #define OSTR 4 /* optional SP then STRING */ 1058 #define ZSTR1 5 /* optional SP then optional STRING */ 1059 #define ZSTR2 6 /* optional STRING after SP */ 1060 #define SITECMD 7 /* SITE command */ 1061 #define NSTR 8 /* Number followed by a string */ 1062 1063 #define MAXGLOBARGS 1000 1064 1065 #define MAXASIZE 10240 /* Deny ASCII SIZE on files larger than that */ 1066 1067 struct tab { 1068 char *name; 1069 short token; 1070 short state; 1071 short implemented; /* 1 if command is implemented */ 1072 char *help; 1073 }; 1074 1075 struct tab cmdtab[] = { /* In order defined in RFC 765 */ 1076 { "USER", USER, STR1, 1, "<sp> username" }, 1077 { "PASS", PASS, ZSTR1, 1, "[<sp> [password]]" }, 1078 { "ACCT", ACCT, STR1, 0, "(specify account)" }, 1079 { "SMNT", SMNT, ARGS, 0, "(structure mount)" }, 1080 { "REIN", REIN, ARGS, 0, "(reinitialize server state)" }, 1081 { "QUIT", QUIT, ARGS, 1, "(terminate service)", }, 1082 { "PORT", PORT, ARGS, 1, "<sp> b0, b1, b2, b3, b4, b5" }, 1083 { "LPRT", LPRT, ARGS, 1, "<sp> af, hal, h1, h2, h3,..., pal, p1, p2..." }, 1084 { "EPRT", EPRT, STR1, 1, "<sp> |af|addr|port|" }, 1085 { "PASV", PASV, ARGS, 1, "(set server in passive mode)" }, 1086 { "LPSV", LPSV, ARGS, 1, "(set server in passive mode)" }, 1087 { "EPSV", EPSV, ARGS, 1, "[<sp> af|ALL]" }, 1088 { "TYPE", TYPE, ARGS, 1, "<sp> { A | E | I | L }" }, 1089 { "STRU", STRU, ARGS, 1, "(specify file structure)" }, 1090 { "MODE", MODE, ARGS, 1, "(specify transfer mode)" }, 1091 { "RETR", RETR, STR1, 1, "<sp> file-name" }, 1092 { "STOR", STOR, STR1, 1, "<sp> file-name" }, 1093 { "APPE", APPE, STR1, 1, "<sp> file-name" }, 1094 { "MLFL", MLFL, OSTR, 0, "(mail file)" }, 1095 { "MAIL", MAIL, OSTR, 0, "(mail to user)" }, 1096 { "MSND", MSND, OSTR, 0, "(mail send to terminal)" }, 1097 { "MSOM", MSOM, OSTR, 0, "(mail send to terminal or mailbox)" }, 1098 { "MSAM", MSAM, OSTR, 0, "(mail send to terminal and mailbox)" }, 1099 { "MRSQ", MRSQ, OSTR, 0, "(mail recipient scheme question)" }, 1100 { "MRCP", MRCP, STR1, 0, "(mail recipient)" }, 1101 { "ALLO", ALLO, ARGS, 1, "allocate storage (vacuously)" }, 1102 { "REST", REST, ARGS, 1, "<sp> offset (restart command)" }, 1103 { "RNFR", RNFR, STR1, 1, "<sp> file-name" }, 1104 { "RNTO", RNTO, STR1, 1, "<sp> file-name" }, 1105 { "ABOR", ABOR, ARGS, 1, "(abort operation)" }, 1106 { "DELE", DELE, STR1, 1, "<sp> file-name" }, 1107 { "CWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1108 { "XCWD", CWD, OSTR, 1, "[ <sp> directory-name ]" }, 1109 { "LIST", LIST, OSTR, 1, "[ <sp> path-name ]" }, 1110 { "NLST", NLST, OSTR, 1, "[ <sp> path-name ]" }, 1111 { "SITE", SITE, SITECMD, 1, "site-cmd [ <sp> arguments ]" }, 1112 { "SYST", SYST, ARGS, 1, "(get type of operating system)" }, 1113 { "STAT", STAT, OSTR, 1, "[ <sp> path-name ]" }, 1114 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1115 { "NOOP", NOOP, ARGS, 1, "" }, 1116 { "MKD", MKD, STR1, 1, "<sp> path-name" }, 1117 { "XMKD", MKD, STR1, 1, "<sp> path-name" }, 1118 { "RMD", RMD, STR1, 1, "<sp> path-name" }, 1119 { "XRMD", RMD, STR1, 1, "<sp> path-name" }, 1120 { "PWD", PWD, ARGS, 1, "(return current directory)" }, 1121 { "XPWD", PWD, ARGS, 1, "(return current directory)" }, 1122 { "CDUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1123 { "XCUP", CDUP, ARGS, 1, "(change to parent directory)" }, 1124 { "STOU", STOU, STR1, 1, "<sp> file-name" }, 1125 { "SIZE", SIZE, OSTR, 1, "<sp> path-name" }, 1126 { "MDTM", MDTM, OSTR, 1, "<sp> path-name" }, 1127 { NULL, 0, 0, 0, 0 } 1128 }; 1129 1130 struct tab sitetab[] = { 1131 { "MD5", MDFIVE, STR1, 1, "[ <sp> file-name ]" }, 1132 { "UMASK", UMASK, ARGS, 1, "[ <sp> umask ]" }, 1133 { "IDLE", IDLE, ARGS, 1, "[ <sp> maximum-idle-time ]" }, 1134 { "CHMOD", CHMOD, NSTR, 1, "<sp> mode <sp> file-name" }, 1135 { "HELP", HELP, OSTR, 1, "[ <sp> <string> ]" }, 1136 { NULL, 0, 0, 0, 0 } 1137 }; 1138 1139 static char *copy(char *); 1140 static char *expglob(char *); 1141 static char *exptilde(char *); 1142 static void help(struct tab *, char *); 1143 static struct tab * 1144 lookup(struct tab *, char *); 1145 static int port_check(const char *); 1146 static int port_check_v6(const char *); 1147 static void sizecmd(char *); 1148 static void toolong(int); 1149 static void v4map_data_dest(void); 1150 static int yylex(void); 1151 1152 static struct tab * 1153 lookup(struct tab *p, char *cmd) 1154 { 1155 1156 for (; p->name != NULL; p++) 1157 if (strcmp(cmd, p->name) == 0) 1158 return (p); 1159 return (0); 1160 } 1161 1162 #include <arpa/telnet.h> 1163 1164 /* 1165 * getline - a hacked up version of fgets to ignore TELNET escape codes. 1166 */ 1167 char * 1168 getline(char *s, int n, FILE *iop) 1169 { 1170 int c; 1171 register char *cs; 1172 1173 cs = s; 1174 /* tmpline may contain saved command from urgent mode interruption */ 1175 for (c = 0; tmpline[c] != '\0' && --n > 0; ++c) { 1176 *cs++ = tmpline[c]; 1177 if (tmpline[c] == '\n') { 1178 *cs++ = '\0'; 1179 if (ftpdebug) 1180 syslog(LOG_DEBUG, "command: %s", s); 1181 tmpline[0] = '\0'; 1182 return(s); 1183 } 1184 if (c == 0) 1185 tmpline[0] = '\0'; 1186 } 1187 while ((c = getc(iop)) != EOF) { 1188 c &= 0377; 1189 if (c == IAC) { 1190 if ((c = getc(iop)) != EOF) { 1191 c &= 0377; 1192 switch (c) { 1193 case WILL: 1194 case WONT: 1195 c = getc(iop); 1196 printf("%c%c%c", IAC, DONT, 0377&c); 1197 (void) fflush(stdout); 1198 continue; 1199 case DO: 1200 case DONT: 1201 c = getc(iop); 1202 printf("%c%c%c", IAC, WONT, 0377&c); 1203 (void) fflush(stdout); 1204 continue; 1205 case IAC: 1206 break; 1207 default: 1208 continue; /* ignore command */ 1209 } 1210 } 1211 } 1212 *cs++ = c; 1213 if (--n <= 0 || c == '\n') 1214 break; 1215 } 1216 if (c == EOF && cs == s) 1217 return (NULL); 1218 *cs++ = '\0'; 1219 if (ftpdebug) { 1220 if (!guest && strncasecmp("pass ", s, 5) == 0) { 1221 /* Don't syslog passwords */ 1222 syslog(LOG_DEBUG, "command: %.5s ???", s); 1223 } else { 1224 register char *cp; 1225 register int len; 1226 1227 /* Don't syslog trailing CR-LF */ 1228 len = strlen(s); 1229 cp = s + len - 1; 1230 while (cp >= s && (*cp == '\n' || *cp == '\r')) { 1231 --cp; 1232 --len; 1233 } 1234 syslog(LOG_DEBUG, "command: %.*s", len, s); 1235 } 1236 } 1237 return (s); 1238 } 1239 1240 static void 1241 toolong(int signo) 1242 { 1243 1244 reply(421, 1245 "Timeout (%d seconds): closing control connection.", timeout); 1246 if (logging) 1247 syslog(LOG_INFO, "User %s timed out after %d seconds", 1248 (pw ? pw -> pw_name : "unknown"), timeout); 1249 dologout(1); 1250 } 1251 1252 static int 1253 yylex(void) 1254 { 1255 static int cpos; 1256 char *cp, *cp2; 1257 struct tab *p; 1258 int n; 1259 char c; 1260 1261 for (;;) { 1262 switch (state) { 1263 1264 case CMD: 1265 (void) signal(SIGALRM, toolong); 1266 (void) alarm((unsigned) timeout); 1267 if (getline(cbuf, sizeof(cbuf)-1, stdin) == NULL) { 1268 reply(221, "You could at least say goodbye."); 1269 dologout(0); 1270 } 1271 (void) alarm(0); 1272 #ifdef SETPROCTITLE 1273 if (strncasecmp(cbuf, "PASS", 4) != 0) 1274 setproctitle("%s: %s", proctitle, cbuf); 1275 #endif /* SETPROCTITLE */ 1276 if ((cp = strchr(cbuf, '\r'))) { 1277 *cp++ = '\n'; 1278 *cp = '\0'; 1279 } 1280 if ((cp = strpbrk(cbuf, " \n"))) 1281 cpos = cp - cbuf; 1282 if (cpos == 0) 1283 cpos = 4; 1284 c = cbuf[cpos]; 1285 cbuf[cpos] = '\0'; 1286 upper(cbuf); 1287 p = lookup(cmdtab, cbuf); 1288 cbuf[cpos] = c; 1289 if (p != 0) { 1290 yylval.s = p->name; 1291 if (!p->implemented) 1292 return (NOTIMPL); /* state remains CMD */ 1293 state = p->state; 1294 return (p->token); 1295 } 1296 break; 1297 1298 case SITECMD: 1299 if (cbuf[cpos] == ' ') { 1300 cpos++; 1301 return (SP); 1302 } 1303 cp = &cbuf[cpos]; 1304 if ((cp2 = strpbrk(cp, " \n"))) 1305 cpos = cp2 - cbuf; 1306 c = cbuf[cpos]; 1307 cbuf[cpos] = '\0'; 1308 upper(cp); 1309 p = lookup(sitetab, cp); 1310 cbuf[cpos] = c; 1311 if (guest == 0 && p != 0) { 1312 yylval.s = p->name; 1313 if (!p->implemented) { 1314 state = CMD; 1315 return (NOTIMPL); 1316 } 1317 state = p->state; 1318 return (p->token); 1319 } 1320 state = CMD; 1321 break; 1322 1323 case ZSTR1: 1324 case OSTR: 1325 if (cbuf[cpos] == '\n') { 1326 state = CMD; 1327 return (CRLF); 1328 } 1329 /* FALLTHROUGH */ 1330 1331 case STR1: 1332 dostr1: 1333 if (cbuf[cpos] == ' ') { 1334 cpos++; 1335 state = state == OSTR ? STR2 : state+1; 1336 return (SP); 1337 } 1338 break; 1339 1340 case ZSTR2: 1341 if (cbuf[cpos] == '\n') { 1342 state = CMD; 1343 return (CRLF); 1344 } 1345 /* FALLTHROUGH */ 1346 1347 case STR2: 1348 cp = &cbuf[cpos]; 1349 n = strlen(cp); 1350 cpos += n - 1; 1351 /* 1352 * Make sure the string is nonempty and \n terminated. 1353 */ 1354 if (n > 1 && cbuf[cpos] == '\n') { 1355 cbuf[cpos] = '\0'; 1356 yylval.s = copy(cp); 1357 cbuf[cpos] = '\n'; 1358 state = ARGS; 1359 return (STRING); 1360 } 1361 break; 1362 1363 case NSTR: 1364 if (cbuf[cpos] == ' ') { 1365 cpos++; 1366 return (SP); 1367 } 1368 if (isdigit(cbuf[cpos])) { 1369 cp = &cbuf[cpos]; 1370 while (isdigit(cbuf[++cpos])) 1371 ; 1372 c = cbuf[cpos]; 1373 cbuf[cpos] = '\0'; 1374 yylval.u.i = atoi(cp); 1375 cbuf[cpos] = c; 1376 state = STR1; 1377 return (NUMBER); 1378 } 1379 state = STR1; 1380 goto dostr1; 1381 1382 case ARGS: 1383 if (isdigit(cbuf[cpos])) { 1384 cp = &cbuf[cpos]; 1385 while (isdigit(cbuf[++cpos])) 1386 ; 1387 c = cbuf[cpos]; 1388 cbuf[cpos] = '\0'; 1389 yylval.u.i = atoi(cp); 1390 yylval.u.o = strtoull(cp, (char **)NULL, 10); 1391 cbuf[cpos] = c; 1392 return (NUMBER); 1393 } 1394 if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 1395 && !isalnum(cbuf[cpos + 3])) { 1396 cpos += 3; 1397 return ALL; 1398 } 1399 switch (cbuf[cpos++]) { 1400 1401 case '\n': 1402 state = CMD; 1403 return (CRLF); 1404 1405 case ' ': 1406 return (SP); 1407 1408 case ',': 1409 return (COMMA); 1410 1411 case 'A': 1412 case 'a': 1413 return (A); 1414 1415 case 'B': 1416 case 'b': 1417 return (B); 1418 1419 case 'C': 1420 case 'c': 1421 return (C); 1422 1423 case 'E': 1424 case 'e': 1425 return (E); 1426 1427 case 'F': 1428 case 'f': 1429 return (F); 1430 1431 case 'I': 1432 case 'i': 1433 return (I); 1434 1435 case 'L': 1436 case 'l': 1437 return (L); 1438 1439 case 'N': 1440 case 'n': 1441 return (N); 1442 1443 case 'P': 1444 case 'p': 1445 return (P); 1446 1447 case 'R': 1448 case 'r': 1449 return (R); 1450 1451 case 'S': 1452 case 's': 1453 return (S); 1454 1455 case 'T': 1456 case 't': 1457 return (T); 1458 1459 } 1460 break; 1461 1462 default: 1463 fatalerror("Unknown state in scanner."); 1464 } 1465 state = CMD; 1466 return (LEXERR); 1467 } 1468 } 1469 1470 void 1471 upper(char *s) 1472 { 1473 while (*s != '\0') { 1474 if (islower(*s)) 1475 *s = toupper(*s); 1476 s++; 1477 } 1478 } 1479 1480 static char * 1481 copy(char *s) 1482 { 1483 char *p; 1484 1485 p = malloc((unsigned) strlen(s) + 1); 1486 if (p == NULL) 1487 fatalerror("Ran out of memory."); 1488 (void) strcpy(p, s); 1489 return (p); 1490 } 1491 1492 static void 1493 help(struct tab *ctab, char *s) 1494 { 1495 struct tab *c; 1496 int width, NCMDS; 1497 char *type; 1498 1499 if (ctab == sitetab) 1500 type = "SITE "; 1501 else 1502 type = ""; 1503 width = 0, NCMDS = 0; 1504 for (c = ctab; c->name != NULL; c++) { 1505 int len = strlen(c->name); 1506 1507 if (len > width) 1508 width = len; 1509 NCMDS++; 1510 } 1511 width = (width + 8) &~ 7; 1512 if (s == 0) { 1513 int i, j, w; 1514 int columns, lines; 1515 1516 lreply(214, "The following %scommands are recognized %s.", 1517 type, "(* =>'s unimplemented)"); 1518 columns = 76 / width; 1519 if (columns == 0) 1520 columns = 1; 1521 lines = (NCMDS + columns - 1) / columns; 1522 for (i = 0; i < lines; i++) { 1523 printf(" "); 1524 for (j = 0; j < columns; j++) { 1525 c = ctab + j * lines + i; 1526 printf("%s%c", c->name, 1527 c->implemented ? ' ' : '*'); 1528 if (c + lines >= &ctab[NCMDS]) 1529 break; 1530 w = strlen(c->name) + 1; 1531 while (w < width) { 1532 putchar(' '); 1533 w++; 1534 } 1535 } 1536 printf("\r\n"); 1537 } 1538 (void) fflush(stdout); 1539 if (hostinfo) 1540 reply(214, "Direct comments to ftp-bugs@%s.", hostname); 1541 else 1542 reply(214, "End."); 1543 return; 1544 } 1545 upper(s); 1546 c = lookup(ctab, s); 1547 if (c == (struct tab *)0) { 1548 reply(502, "Unknown command %s.", s); 1549 return; 1550 } 1551 if (c->implemented) 1552 reply(214, "Syntax: %s%s %s", type, c->name, c->help); 1553 else 1554 reply(214, "%s%-*s\t%s; unimplemented.", type, width, 1555 c->name, c->help); 1556 } 1557 1558 static void 1559 sizecmd(char *filename) 1560 { 1561 switch (type) { 1562 case TYPE_L: 1563 case TYPE_I: { 1564 struct stat stbuf; 1565 if (stat(filename, &stbuf) < 0) 1566 perror_reply(550, filename); 1567 else if (!S_ISREG(stbuf.st_mode)) 1568 reply(550, "%s: not a plain file.", filename); 1569 else 1570 reply(213, "%qu", stbuf.st_size); 1571 break; } 1572 case TYPE_A: { 1573 FILE *fin; 1574 int c; 1575 off_t count; 1576 struct stat stbuf; 1577 fin = fopen(filename, "r"); 1578 if (fin == NULL) { 1579 perror_reply(550, filename); 1580 return; 1581 } 1582 if (fstat(fileno(fin), &stbuf) < 0) { 1583 perror_reply(550, filename); 1584 (void) fclose(fin); 1585 return; 1586 } else if (!S_ISREG(stbuf.st_mode)) { 1587 reply(550, "%s: not a plain file.", filename); 1588 (void) fclose(fin); 1589 return; 1590 } else if (stbuf.st_size > MAXASIZE) { 1591 reply(550, "%s: too large for type A SIZE.", filename); 1592 (void) fclose(fin); 1593 return; 1594 } 1595 1596 count = 0; 1597 while((c=getc(fin)) != EOF) { 1598 if (c == '\n') /* will get expanded to \r\n */ 1599 count++; 1600 count++; 1601 } 1602 (void) fclose(fin); 1603 1604 reply(213, "%qd", count); 1605 break; } 1606 default: 1607 reply(504, "SIZE not implemented for type %s.", 1608 typenames[type]); 1609 } 1610 } 1611 1612 /* Return 1, if port check is done. Return 0, if not yet. */ 1613 static int 1614 port_check(const char *pcmd) 1615 { 1616 if (his_addr.su_family == AF_INET) { 1617 if (data_dest.su_family != AF_INET) { 1618 usedefault = 1; 1619 reply(500, "Invalid address rejected."); 1620 return 1; 1621 } 1622 if (paranoid && 1623 ((ntohs(data_dest.su_port) < IPPORT_RESERVED) || 1624 memcmp(&data_dest.su_sin.sin_addr, 1625 &his_addr.su_sin.sin_addr, 1626 sizeof(data_dest.su_sin.sin_addr)))) { 1627 usedefault = 1; 1628 reply(500, "Illegal PORT range rejected."); 1629 } else { 1630 usedefault = 0; 1631 if (pdata >= 0) { 1632 (void) close(pdata); 1633 pdata = -1; 1634 } 1635 reply(200, "%s command successful.", pcmd); 1636 } 1637 return 1; 1638 } 1639 return 0; 1640 } 1641 1642 static int 1643 check_login1(void) 1644 { 1645 if (logged_in) 1646 return 1; 1647 else { 1648 reply(530, "Please login with USER and PASS."); 1649 return 0; 1650 } 1651 } 1652 1653 /* 1654 * Replace leading "~user" in a pathname by the user's login directory. 1655 * Returned string will be in a freshly malloced buffer unless it's NULL. 1656 */ 1657 static char * 1658 exptilde(char *s) 1659 { 1660 char *p, *q; 1661 char *path, *user; 1662 struct passwd *ppw; 1663 1664 if ((p = strdup(s)) == NULL) 1665 return (NULL); 1666 if (*p != '~') 1667 return (p); 1668 1669 user = p + 1; /* skip tilde */ 1670 if ((path = strchr(p, '/')) != NULL) 1671 *(path++) = '\0'; /* separate ~user from the rest of path */ 1672 if (*user == '\0') /* no user specified, use the current user */ 1673 user = pw->pw_name; 1674 /* read passwd even for the current user since we may be chrooted */ 1675 if ((ppw = getpwnam(user)) != NULL) { 1676 /* user found, substitute login directory for ~user */ 1677 if (path) 1678 asprintf(&q, "%s/%s", ppw->pw_dir, path); 1679 else 1680 q = strdup(ppw->pw_dir); 1681 free(p); 1682 p = q; 1683 } else { 1684 /* user not found, undo the damage */ 1685 if (path) 1686 path[-1] = '/'; 1687 } 1688 return (p); 1689 } 1690 1691 /* 1692 * Expand glob(3) patterns possibly present in a pathname. 1693 * Avoid expanding to a pathname including '\r' or '\n' in order to 1694 * not disrupt the FTP protocol. 1695 * The expansion found must be unique. 1696 * Return the result as a malloced string, or NULL if an error occured. 1697 * 1698 * Problem: this production is used for all pathname 1699 * processing, but only gives a 550 error reply. 1700 * This is a valid reply in some cases but not in others. 1701 */ 1702 static char * 1703 expglob(char *s) 1704 { 1705 char *p, **pp, *rval; 1706 int flags = GLOB_BRACE | GLOB_NOCHECK; 1707 int n; 1708 glob_t gl; 1709 1710 memset(&gl, 0, sizeof(gl)); 1711 flags |= GLOB_LIMIT; 1712 gl.gl_matchc = MAXGLOBARGS; 1713 if (glob(s, flags, NULL, &gl) == 0 && gl.gl_pathc != 0) { 1714 for (pp = gl.gl_pathv, p = NULL, n = 0; *pp; pp++) 1715 if (*(*pp + strcspn(*pp, "\r\n")) == '\0') { 1716 p = *pp; 1717 n++; 1718 } 1719 if (n == 0) 1720 rval = strdup(s); 1721 else if (n == 1) 1722 rval = strdup(p); 1723 else { 1724 reply(550, "ambiguous"); 1725 rval = NULL; 1726 } 1727 } else { 1728 reply(550, "wildcard expansion error"); 1729 rval = NULL; 1730 } 1731 globfree(&gl); 1732 return (rval); 1733 } 1734 1735 #ifdef INET6 1736 /* Return 1, if port check is done. Return 0, if not yet. */ 1737 static int 1738 port_check_v6(const char *pcmd) 1739 { 1740 if (his_addr.su_family == AF_INET6) { 1741 if (IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 1742 /* Convert data_dest into v4 mapped sockaddr.*/ 1743 v4map_data_dest(); 1744 if (data_dest.su_family != AF_INET6) { 1745 usedefault = 1; 1746 reply(500, "Invalid address rejected."); 1747 return 1; 1748 } 1749 if (paranoid && 1750 ((ntohs(data_dest.su_port) < IPPORT_RESERVED) || 1751 memcmp(&data_dest.su_sin6.sin6_addr, 1752 &his_addr.su_sin6.sin6_addr, 1753 sizeof(data_dest.su_sin6.sin6_addr)))) { 1754 usedefault = 1; 1755 reply(500, "Illegal PORT range rejected."); 1756 } else { 1757 usedefault = 0; 1758 if (pdata >= 0) { 1759 (void) close(pdata); 1760 pdata = -1; 1761 } 1762 reply(200, "%s command successful.", pcmd); 1763 } 1764 return 1; 1765 } 1766 return 0; 1767 } 1768 1769 static void 1770 v4map_data_dest(void) 1771 { 1772 struct in_addr savedaddr; 1773 int savedport; 1774 1775 if (data_dest.su_family != AF_INET) { 1776 usedefault = 1; 1777 reply(500, "Invalid address rejected."); 1778 return; 1779 } 1780 1781 savedaddr = data_dest.su_sin.sin_addr; 1782 savedport = data_dest.su_port; 1783 1784 memset(&data_dest, 0, sizeof(data_dest)); 1785 data_dest.su_sin6.sin6_len = sizeof(struct sockaddr_in6); 1786 data_dest.su_sin6.sin6_family = AF_INET6; 1787 data_dest.su_sin6.sin6_port = savedport; 1788 memset((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[10], 0xff, 2); 1789 memcpy((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[12], 1790 (caddr_t)&savedaddr, sizeof(savedaddr)); 1791 } 1792 #endif 1793