ftpcmd.y revision 117351
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 45static char sccsid[] = "@(#)ftpcmd.y 8.3 (Berkeley) 4/6/94"; 46#endif 47static const char rcsid[] = 48 "$FreeBSD: head/libexec/ftpd/ftpcmd.y 117351 2003-07-09 13:15:32Z yar $"; 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 77extern union sockunion data_dest, his_addr; 78extern int hostinfo; 79extern int logged_in; 80extern struct passwd *pw; 81extern int guest; 82extern char *homedir; 83extern int paranoid; 84extern int logging; 85extern int type; 86extern int form; 87extern int ftpdebug; 88extern int timeout; 89extern int maxtimeout; 90extern int pdata; 91extern char *hostname; 92extern char proctitle[]; 93extern int usedefault; 94extern char tmpline[]; 95extern int readonly; 96extern int noepsv; 97extern int noretr; 98extern int noguestretr; 99extern char *typenames[]; /* defined in <arpa/ftp.h> included from ftpd.c */ 100 101off_t restart_point; 102 103static int cmd_type; 104static int cmd_form; 105static int cmd_bytesz; 106static int state; 107char cbuf[512]; 108char *fromname = (char *) 0; 109 110extern 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 155cmd_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 167cmd 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 ; 764rcmd 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 794username 795 : STRING 796 ; 797 798password 799 : /* empty */ 800 { 801 $$ = (char *)calloc(1, sizeof(char)); 802 } 803 | STRING 804 ; 805 806byte_size 807 : NUMBER 808 { 809 $$ = $1.i; 810 } 811 ; 812 813host_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 828host_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 874form_code 875 : N 876 { 877 $$ = FORM_N; 878 } 879 | T 880 { 881 $$ = FORM_T; 882 } 883 | C 884 { 885 $$ = FORM_C; 886 } 887 ; 888 889type_code 890 : A 891 { 892 cmd_type = TYPE_A; 893 cmd_form = FORM_N; 894 } 895 | A SP form_code 896 { 897 cmd_type = TYPE_A; 898 cmd_form = $3; 899 } 900 | E 901 { 902 cmd_type = TYPE_E; 903 cmd_form = FORM_N; 904 } 905 | E SP form_code 906 { 907 cmd_type = TYPE_E; 908 cmd_form = $3; 909 } 910 | I 911 { 912 cmd_type = TYPE_I; 913 } 914 | L 915 { 916 cmd_type = TYPE_L; 917 cmd_bytesz = CHAR_BIT; 918 } 919 | L SP byte_size 920 { 921 cmd_type = TYPE_L; 922 cmd_bytesz = $3; 923 } 924 /* this is for a bug in the BBN ftp */ 925 | L byte_size 926 { 927 cmd_type = TYPE_L; 928 cmd_bytesz = $2; 929 } 930 ; 931 932struct_code 933 : F 934 { 935 $$ = STRU_F; 936 } 937 | R 938 { 939 $$ = STRU_R; 940 } 941 | P 942 { 943 $$ = STRU_P; 944 } 945 ; 946 947mode_code 948 : S 949 { 950 $$ = MODE_S; 951 } 952 | B 953 { 954 $$ = MODE_B; 955 } 956 | C 957 { 958 $$ = MODE_C; 959 } 960 ; 961 962pathname 963 : pathstring 964 { 965 if (logged_in && $1) { 966 char *p; 967 968 /* 969 * Expand ~user manually since glob(3) 970 * will return the unexpanded pathname 971 * if the corresponding file/directory 972 * doesn't exist yet. Using sole glob(3) 973 * would break natural commands like 974 * MKD ~user/newdir 975 * or 976 * RNTO ~/newfile 977 */ 978 if ((p = exptilde($1)) != NULL) { 979 $$ = expglob(p); 980 free(p); 981 } else 982 $$ = NULL; 983 free($1); 984 } else 985 $$ = $1; 986 } 987 ; 988 989pathstring 990 : STRING 991 ; 992 993octal_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 $$ = ret; 1016 } 1017 ; 1018 1019 1020check_login 1021 : /* empty */ 1022 { 1023 $$ = check_login1(); 1024 } 1025 ; 1026 1027check_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 1039check_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 1067struct tab { 1068 char *name; 1069 short token; 1070 short state; 1071 short implemented; /* 1 if command is implemented */ 1072 char *help; 1073}; 1074 1075struct 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 1130struct 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 1139static char *copy(char *); 1140static char *expglob(char *); 1141static char *exptilde(char *); 1142static void help(struct tab *, char *); 1143static struct tab * 1144 lookup(struct tab *, char *); 1145static int port_check(const char *); 1146static int port_check_v6(const char *); 1147static void sizecmd(char *); 1148static void toolong(int); 1149static void v4map_data_dest(void); 1150static int yylex(void); 1151 1152static struct tab * 1153lookup(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 */ 1167char * 1168getline(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 goto got_eof; 1192 c &= 0377; 1193 switch (c) { 1194 case WILL: 1195 case WONT: 1196 if ((c = getc(iop)) == EOF) 1197 goto got_eof; 1198 printf("%c%c%c", IAC, DONT, 0377&c); 1199 (void) fflush(stdout); 1200 continue; 1201 case DO: 1202 case DONT: 1203 if ((c = getc(iop)) == EOF) 1204 goto got_eof; 1205 printf("%c%c%c", IAC, WONT, 0377&c); 1206 (void) fflush(stdout); 1207 continue; 1208 case IAC: 1209 break; 1210 default: 1211 continue; /* ignore command */ 1212 } 1213 } 1214 *cs++ = c; 1215 if (--n <= 0 || c == '\n') 1216 break; 1217 } 1218got_eof: 1219 if (c == EOF && cs == s) 1220 return (NULL); 1221 *cs++ = '\0'; 1222 if (ftpdebug) { 1223 if (!guest && strncasecmp("pass ", s, 5) == 0) { 1224 /* Don't syslog passwords */ 1225 syslog(LOG_DEBUG, "command: %.5s ???", s); 1226 } else { 1227 register char *cp; 1228 register int len; 1229 1230 /* Don't syslog trailing CR-LF */ 1231 len = strlen(s); 1232 cp = s + len - 1; 1233 while (cp >= s && (*cp == '\n' || *cp == '\r')) { 1234 --cp; 1235 --len; 1236 } 1237 syslog(LOG_DEBUG, "command: %.*s", len, s); 1238 } 1239 } 1240 return (s); 1241} 1242 1243static void 1244toolong(int signo) 1245{ 1246 1247 reply(421, 1248 "Timeout (%d seconds): closing control connection.", timeout); 1249 if (logging) 1250 syslog(LOG_INFO, "User %s timed out after %d seconds", 1251 (pw ? pw -> pw_name : "unknown"), timeout); 1252 dologout(1); 1253} 1254 1255static int 1256yylex(void) 1257{ 1258 static int cpos; 1259 char *cp, *cp2; 1260 struct tab *p; 1261 int n; 1262 char c; 1263 1264 for (;;) { 1265 switch (state) { 1266 1267 case CMD: 1268 (void) signal(SIGALRM, toolong); 1269 (void) alarm((unsigned) timeout); 1270 if (getline(cbuf, sizeof(cbuf)-1, stdin) == NULL) { 1271 reply(221, "You could at least say goodbye."); 1272 dologout(0); 1273 } 1274 (void) alarm(0); 1275#ifdef SETPROCTITLE 1276 if (strncasecmp(cbuf, "PASS", 4) != 0) 1277 setproctitle("%s: %s", proctitle, cbuf); 1278#endif /* SETPROCTITLE */ 1279 if ((cp = strchr(cbuf, '\r'))) { 1280 *cp++ = '\n'; 1281 *cp = '\0'; 1282 } 1283 if ((cp = strpbrk(cbuf, " \n"))) 1284 cpos = cp - cbuf; 1285 if (cpos == 0) 1286 cpos = 4; 1287 c = cbuf[cpos]; 1288 cbuf[cpos] = '\0'; 1289 upper(cbuf); 1290 p = lookup(cmdtab, cbuf); 1291 cbuf[cpos] = c; 1292 if (p != 0) { 1293 yylval.s = p->name; 1294 if (!p->implemented) 1295 return (NOTIMPL); /* state remains CMD */ 1296 state = p->state; 1297 return (p->token); 1298 } 1299 break; 1300 1301 case SITECMD: 1302 if (cbuf[cpos] == ' ') { 1303 cpos++; 1304 return (SP); 1305 } 1306 cp = &cbuf[cpos]; 1307 if ((cp2 = strpbrk(cp, " \n"))) 1308 cpos = cp2 - cbuf; 1309 c = cbuf[cpos]; 1310 cbuf[cpos] = '\0'; 1311 upper(cp); 1312 p = lookup(sitetab, cp); 1313 cbuf[cpos] = c; 1314 if (guest == 0 && p != 0) { 1315 yylval.s = p->name; 1316 if (!p->implemented) { 1317 state = CMD; 1318 return (NOTIMPL); 1319 } 1320 state = p->state; 1321 return (p->token); 1322 } 1323 state = CMD; 1324 break; 1325 1326 case ZSTR1: 1327 case OSTR: 1328 if (cbuf[cpos] == '\n') { 1329 state = CMD; 1330 return (CRLF); 1331 } 1332 /* FALLTHROUGH */ 1333 1334 case STR1: 1335 dostr1: 1336 if (cbuf[cpos] == ' ') { 1337 cpos++; 1338 state = state == OSTR ? STR2 : state+1; 1339 return (SP); 1340 } 1341 break; 1342 1343 case ZSTR2: 1344 if (cbuf[cpos] == '\n') { 1345 state = CMD; 1346 return (CRLF); 1347 } 1348 /* FALLTHROUGH */ 1349 1350 case STR2: 1351 cp = &cbuf[cpos]; 1352 n = strlen(cp); 1353 cpos += n - 1; 1354 /* 1355 * Make sure the string is nonempty and \n terminated. 1356 */ 1357 if (n > 1 && cbuf[cpos] == '\n') { 1358 cbuf[cpos] = '\0'; 1359 yylval.s = copy(cp); 1360 cbuf[cpos] = '\n'; 1361 state = ARGS; 1362 return (STRING); 1363 } 1364 break; 1365 1366 case NSTR: 1367 if (cbuf[cpos] == ' ') { 1368 cpos++; 1369 return (SP); 1370 } 1371 if (isdigit(cbuf[cpos])) { 1372 cp = &cbuf[cpos]; 1373 while (isdigit(cbuf[++cpos])) 1374 ; 1375 c = cbuf[cpos]; 1376 cbuf[cpos] = '\0'; 1377 yylval.u.i = atoi(cp); 1378 cbuf[cpos] = c; 1379 state = STR1; 1380 return (NUMBER); 1381 } 1382 state = STR1; 1383 goto dostr1; 1384 1385 case ARGS: 1386 if (isdigit(cbuf[cpos])) { 1387 cp = &cbuf[cpos]; 1388 while (isdigit(cbuf[++cpos])) 1389 ; 1390 c = cbuf[cpos]; 1391 cbuf[cpos] = '\0'; 1392 yylval.u.i = atoi(cp); 1393 yylval.u.o = strtoull(cp, (char **)NULL, 10); 1394 cbuf[cpos] = c; 1395 return (NUMBER); 1396 } 1397 if (strncasecmp(&cbuf[cpos], "ALL", 3) == 0 1398 && !isalnum(cbuf[cpos + 3])) { 1399 cpos += 3; 1400 return ALL; 1401 } 1402 switch (cbuf[cpos++]) { 1403 1404 case '\n': 1405 state = CMD; 1406 return (CRLF); 1407 1408 case ' ': 1409 return (SP); 1410 1411 case ',': 1412 return (COMMA); 1413 1414 case 'A': 1415 case 'a': 1416 return (A); 1417 1418 case 'B': 1419 case 'b': 1420 return (B); 1421 1422 case 'C': 1423 case 'c': 1424 return (C); 1425 1426 case 'E': 1427 case 'e': 1428 return (E); 1429 1430 case 'F': 1431 case 'f': 1432 return (F); 1433 1434 case 'I': 1435 case 'i': 1436 return (I); 1437 1438 case 'L': 1439 case 'l': 1440 return (L); 1441 1442 case 'N': 1443 case 'n': 1444 return (N); 1445 1446 case 'P': 1447 case 'p': 1448 return (P); 1449 1450 case 'R': 1451 case 'r': 1452 return (R); 1453 1454 case 'S': 1455 case 's': 1456 return (S); 1457 1458 case 'T': 1459 case 't': 1460 return (T); 1461 1462 } 1463 break; 1464 1465 default: 1466 fatalerror("Unknown state in scanner."); 1467 } 1468 state = CMD; 1469 return (LEXERR); 1470 } 1471} 1472 1473void 1474upper(char *s) 1475{ 1476 while (*s != '\0') { 1477 if (islower(*s)) 1478 *s = toupper(*s); 1479 s++; 1480 } 1481} 1482 1483static char * 1484copy(char *s) 1485{ 1486 char *p; 1487 1488 p = malloc((unsigned) strlen(s) + 1); 1489 if (p == NULL) 1490 fatalerror("Ran out of memory."); 1491 (void) strcpy(p, s); 1492 return (p); 1493} 1494 1495static void 1496help(struct tab *ctab, char *s) 1497{ 1498 struct tab *c; 1499 int width, NCMDS; 1500 char *type; 1501 1502 if (ctab == sitetab) 1503 type = "SITE "; 1504 else 1505 type = ""; 1506 width = 0, NCMDS = 0; 1507 for (c = ctab; c->name != NULL; c++) { 1508 int len = strlen(c->name); 1509 1510 if (len > width) 1511 width = len; 1512 NCMDS++; 1513 } 1514 width = (width + 8) &~ 7; 1515 if (s == 0) { 1516 int i, j, w; 1517 int columns, lines; 1518 1519 lreply(214, "The following %scommands are recognized %s.", 1520 type, "(* =>'s unimplemented)"); 1521 columns = 76 / width; 1522 if (columns == 0) 1523 columns = 1; 1524 lines = (NCMDS + columns - 1) / columns; 1525 for (i = 0; i < lines; i++) { 1526 printf(" "); 1527 for (j = 0; j < columns; j++) { 1528 c = ctab + j * lines + i; 1529 printf("%s%c", c->name, 1530 c->implemented ? ' ' : '*'); 1531 if (c + lines >= &ctab[NCMDS]) 1532 break; 1533 w = strlen(c->name) + 1; 1534 while (w < width) { 1535 putchar(' '); 1536 w++; 1537 } 1538 } 1539 printf("\r\n"); 1540 } 1541 (void) fflush(stdout); 1542 if (hostinfo) 1543 reply(214, "Direct comments to ftp-bugs@%s.", hostname); 1544 else 1545 reply(214, "End."); 1546 return; 1547 } 1548 upper(s); 1549 c = lookup(ctab, s); 1550 if (c == (struct tab *)0) { 1551 reply(502, "Unknown command %s.", s); 1552 return; 1553 } 1554 if (c->implemented) 1555 reply(214, "Syntax: %s%s %s", type, c->name, c->help); 1556 else 1557 reply(214, "%s%-*s\t%s; unimplemented.", type, width, 1558 c->name, c->help); 1559} 1560 1561static void 1562sizecmd(char *filename) 1563{ 1564 switch (type) { 1565 case TYPE_L: 1566 case TYPE_I: { 1567 struct stat stbuf; 1568 if (stat(filename, &stbuf) < 0) 1569 perror_reply(550, filename); 1570 else if (!S_ISREG(stbuf.st_mode)) 1571 reply(550, "%s: not a plain file.", filename); 1572 else 1573 reply(213, "%qu", stbuf.st_size); 1574 break; } 1575 case TYPE_A: { 1576 FILE *fin; 1577 int c; 1578 off_t count; 1579 struct stat stbuf; 1580 fin = fopen(filename, "r"); 1581 if (fin == NULL) { 1582 perror_reply(550, filename); 1583 return; 1584 } 1585 if (fstat(fileno(fin), &stbuf) < 0) { 1586 perror_reply(550, filename); 1587 (void) fclose(fin); 1588 return; 1589 } else if (!S_ISREG(stbuf.st_mode)) { 1590 reply(550, "%s: not a plain file.", filename); 1591 (void) fclose(fin); 1592 return; 1593 } else if (stbuf.st_size > MAXASIZE) { 1594 reply(550, "%s: too large for type A SIZE.", filename); 1595 (void) fclose(fin); 1596 return; 1597 } 1598 1599 count = 0; 1600 while((c=getc(fin)) != EOF) { 1601 if (c == '\n') /* will get expanded to \r\n */ 1602 count++; 1603 count++; 1604 } 1605 (void) fclose(fin); 1606 1607 reply(213, "%qd", count); 1608 break; } 1609 default: 1610 reply(504, "SIZE not implemented for type %s.", 1611 typenames[type]); 1612 } 1613} 1614 1615/* Return 1, if port check is done. Return 0, if not yet. */ 1616static int 1617port_check(const char *pcmd) 1618{ 1619 if (his_addr.su_family == AF_INET) { 1620 if (data_dest.su_family != AF_INET) { 1621 usedefault = 1; 1622 reply(500, "Invalid address rejected."); 1623 return 1; 1624 } 1625 if (paranoid && 1626 ((ntohs(data_dest.su_port) < IPPORT_RESERVED) || 1627 memcmp(&data_dest.su_sin.sin_addr, 1628 &his_addr.su_sin.sin_addr, 1629 sizeof(data_dest.su_sin.sin_addr)))) { 1630 usedefault = 1; 1631 reply(500, "Illegal PORT range rejected."); 1632 } else { 1633 usedefault = 0; 1634 if (pdata >= 0) { 1635 (void) close(pdata); 1636 pdata = -1; 1637 } 1638 reply(200, "%s command successful.", pcmd); 1639 } 1640 return 1; 1641 } 1642 return 0; 1643} 1644 1645static int 1646check_login1(void) 1647{ 1648 if (logged_in) 1649 return 1; 1650 else { 1651 reply(530, "Please login with USER and PASS."); 1652 return 0; 1653 } 1654} 1655 1656/* 1657 * Replace leading "~user" in a pathname by the user's login directory. 1658 * Returned string will be in a freshly malloced buffer unless it's NULL. 1659 */ 1660static char * 1661exptilde(char *s) 1662{ 1663 char *p, *q; 1664 char *path, *user; 1665 struct passwd *ppw; 1666 1667 if ((p = strdup(s)) == NULL) 1668 return (NULL); 1669 if (*p != '~') 1670 return (p); 1671 1672 user = p + 1; /* skip tilde */ 1673 if ((path = strchr(p, '/')) != NULL) 1674 *(path++) = '\0'; /* separate ~user from the rest of path */ 1675 if (*user == '\0') /* no user specified, use the current user */ 1676 user = pw->pw_name; 1677 /* read passwd even for the current user since we may be chrooted */ 1678 if ((ppw = getpwnam(user)) != NULL) { 1679 /* user found, substitute login directory for ~user */ 1680 if (path) 1681 asprintf(&q, "%s/%s", ppw->pw_dir, path); 1682 else 1683 q = strdup(ppw->pw_dir); 1684 free(p); 1685 p = q; 1686 } else { 1687 /* user not found, undo the damage */ 1688 if (path) 1689 path[-1] = '/'; 1690 } 1691 return (p); 1692} 1693 1694/* 1695 * Expand glob(3) patterns possibly present in a pathname. 1696 * Avoid expanding to a pathname including '\r' or '\n' in order to 1697 * not disrupt the FTP protocol. 1698 * The expansion found must be unique. 1699 * Return the result as a malloced string, or NULL if an error occured. 1700 * 1701 * Problem: this production is used for all pathname 1702 * processing, but only gives a 550 error reply. 1703 * This is a valid reply in some cases but not in others. 1704 */ 1705static char * 1706expglob(char *s) 1707{ 1708 char *p, **pp, *rval; 1709 int flags = GLOB_BRACE | GLOB_NOCHECK; 1710 int n; 1711 glob_t gl; 1712 1713 memset(&gl, 0, sizeof(gl)); 1714 flags |= GLOB_LIMIT; 1715 gl.gl_matchc = MAXGLOBARGS; 1716 if (glob(s, flags, NULL, &gl) == 0 && gl.gl_pathc != 0) { 1717 for (pp = gl.gl_pathv, p = NULL, n = 0; *pp; pp++) 1718 if (*(*pp + strcspn(*pp, "\r\n")) == '\0') { 1719 p = *pp; 1720 n++; 1721 } 1722 if (n == 0) 1723 rval = strdup(s); 1724 else if (n == 1) 1725 rval = strdup(p); 1726 else { 1727 reply(550, "ambiguous"); 1728 rval = NULL; 1729 } 1730 } else { 1731 reply(550, "wildcard expansion error"); 1732 rval = NULL; 1733 } 1734 globfree(&gl); 1735 return (rval); 1736} 1737 1738#ifdef INET6 1739/* Return 1, if port check is done. Return 0, if not yet. */ 1740static int 1741port_check_v6(const char *pcmd) 1742{ 1743 if (his_addr.su_family == AF_INET6) { 1744 if (IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 1745 /* Convert data_dest into v4 mapped sockaddr.*/ 1746 v4map_data_dest(); 1747 if (data_dest.su_family != AF_INET6) { 1748 usedefault = 1; 1749 reply(500, "Invalid address rejected."); 1750 return 1; 1751 } 1752 if (paranoid && 1753 ((ntohs(data_dest.su_port) < IPPORT_RESERVED) || 1754 memcmp(&data_dest.su_sin6.sin6_addr, 1755 &his_addr.su_sin6.sin6_addr, 1756 sizeof(data_dest.su_sin6.sin6_addr)))) { 1757 usedefault = 1; 1758 reply(500, "Illegal PORT range rejected."); 1759 } else { 1760 usedefault = 0; 1761 if (pdata >= 0) { 1762 (void) close(pdata); 1763 pdata = -1; 1764 } 1765 reply(200, "%s command successful.", pcmd); 1766 } 1767 return 1; 1768 } 1769 return 0; 1770} 1771 1772static void 1773v4map_data_dest(void) 1774{ 1775 struct in_addr savedaddr; 1776 int savedport; 1777 1778 if (data_dest.su_family != AF_INET) { 1779 usedefault = 1; 1780 reply(500, "Invalid address rejected."); 1781 return; 1782 } 1783 1784 savedaddr = data_dest.su_sin.sin_addr; 1785 savedport = data_dest.su_port; 1786 1787 memset(&data_dest, 0, sizeof(data_dest)); 1788 data_dest.su_sin6.sin6_len = sizeof(struct sockaddr_in6); 1789 data_dest.su_sin6.sin6_family = AF_INET6; 1790 data_dest.su_sin6.sin6_port = savedport; 1791 memset((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[10], 0xff, 2); 1792 memcpy((caddr_t)&data_dest.su_sin6.sin6_addr.s6_addr[12], 1793 (caddr_t)&savedaddr, sizeof(savedaddr)); 1794} 1795#endif 1796