1 /* 2 * Copyright (c) 1985, 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1985, 1988 Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)ftpd.c 5.31 (Berkeley) 02/19/90"; 26 #endif /* not lint */ 27 28 /* 29 * FTP server. 30 */ 31 #include <sys/param.h> 32 #include <sys/stat.h> 33 #include <sys/ioctl.h> 34 #include <sys/socket.h> 35 #include <sys/file.h> 36 #include <sys/wait.h> 37 #include <sys/dir.h> 38 39 #include <netinet/in.h> 40 41 #define FTP_NAMES 42 #include <arpa/ftp.h> 43 #include <arpa/inet.h> 44 #include <arpa/telnet.h> 45 46 #include <ctype.h> 47 #include <stdio.h> 48 #include <signal.h> 49 #include <pwd.h> 50 #include <setjmp.h> 51 #include <netdb.h> 52 #include <errno.h> 53 #include <strings.h> 54 #include <syslog.h> 55 #include <varargs.h> 56 #include "pathnames.h" 57 58 /* 59 * File containing login names 60 * NOT to be used on this machine. 61 * Commonly used to disallow uucp. 62 */ 63 extern int errno; 64 extern char *sys_errlist[]; 65 extern int sys_nerr; 66 extern char *crypt(); 67 extern char version[]; 68 extern char *home; /* pointer to home directory for glob */ 69 extern FILE *ftpd_popen(), *fopen(), *freopen(); 70 extern int ftpd_pclose(), fclose(); 71 extern char *getline(); 72 extern char cbuf[]; 73 extern off_t restart_point; 74 75 struct sockaddr_in ctrl_addr; 76 struct sockaddr_in data_source; 77 struct sockaddr_in data_dest; 78 struct sockaddr_in his_addr; 79 struct sockaddr_in pasv_addr; 80 81 int data; 82 jmp_buf errcatch, urgcatch; 83 int logged_in; 84 struct passwd *pw; 85 int debug; 86 int timeout = 900; /* timeout after 15 minutes of inactivity */ 87 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 88 int logging; 89 int guest; 90 int type; 91 int form; 92 int stru; /* avoid C keyword */ 93 int mode; 94 int usedefault = 1; /* for data transfers */ 95 int pdata = -1; /* for passive mode */ 96 int transflag; 97 off_t file_size; 98 off_t byte_count; 99 #if !defined(CMASK) || CMASK == 0 100 #undef CMASK 101 #define CMASK 027 102 #endif 103 int defumask = CMASK; /* default umask value */ 104 char tmpline[7]; 105 char hostname[MAXHOSTNAMELEN]; 106 char remotehost[MAXHOSTNAMELEN]; 107 108 /* 109 * Timeout intervals for retrying connections 110 * to hosts that don't accept PORT cmds. This 111 * is a kludge, but given the problems with TCP... 112 */ 113 #define SWAITMAX 90 /* wait at most 90 seconds */ 114 #define SWAITINT 5 /* interval between retries */ 115 116 int swaitmax = SWAITMAX; 117 int swaitint = SWAITINT; 118 119 int lostconn(); 120 int myoob(); 121 FILE *getdatasock(), *dataconn(); 122 123 #ifdef SETPROCTITLE 124 char **Argv = NULL; /* pointer to argument vector */ 125 char *LastArgv = NULL; /* end of argv */ 126 char proctitle[BUFSIZ]; /* initial part of title */ 127 #endif /* SETPROCTITLE */ 128 129 main(argc, argv, envp) 130 int argc; 131 char *argv[]; 132 char **envp; 133 { 134 int addrlen, on = 1; 135 char *cp; 136 137 addrlen = sizeof (his_addr); 138 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 139 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 140 exit(1); 141 } 142 addrlen = sizeof (ctrl_addr); 143 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 144 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 145 exit(1); 146 } 147 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 148 debug = 0; 149 openlog("ftpd", LOG_PID, LOG_DAEMON); 150 #ifdef SETPROCTITLE 151 /* 152 * Save start and extent of argv for setproctitle. 153 */ 154 Argv = argv; 155 while (*envp) 156 envp++; 157 LastArgv = envp[-1] + strlen(envp[-1]); 158 #endif /* SETPROCTITLE */ 159 160 argc--, argv++; 161 while (argc > 0 && *argv[0] == '-') { 162 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 163 164 case 'v': 165 debug = 1; 166 break; 167 168 case 'd': 169 debug = 1; 170 break; 171 172 case 'l': 173 logging = 1; 174 break; 175 176 case 't': 177 timeout = atoi(++cp); 178 if (maxtimeout < timeout) 179 maxtimeout = timeout; 180 goto nextopt; 181 182 case 'T': 183 maxtimeout = atoi(++cp); 184 if (timeout > maxtimeout) 185 timeout = maxtimeout; 186 goto nextopt; 187 188 case 'u': 189 { 190 int val = 0; 191 192 while (*++cp && *cp >= '0' && *cp <= '9') 193 val = val*8 + *cp - '0'; 194 if (*cp) 195 fprintf(stderr, "ftpd: Bad value for -u\n"); 196 else 197 defumask = val; 198 goto nextopt; 199 } 200 201 default: 202 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 203 *cp); 204 break; 205 } 206 nextopt: 207 argc--, argv++; 208 } 209 (void) freopen(_PATH_DEVNULL, "w", stderr); 210 (void) signal(SIGPIPE, lostconn); 211 (void) signal(SIGCHLD, SIG_IGN); 212 if ((int)signal(SIGURG, myoob) < 0) 213 syslog(LOG_ERR, "signal: %m"); 214 215 /* Try to handle urgent data inline */ 216 #ifdef SO_OOBINLINE 217 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 218 syslog(LOG_ERR, "setsockopt: %m"); 219 #endif 220 221 #ifdef F_SETOWN 222 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 223 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 224 #endif 225 dolog(&his_addr); 226 /* 227 * Set up default state 228 */ 229 data = -1; 230 type = TYPE_A; 231 form = FORM_N; 232 stru = STRU_F; 233 mode = MODE_S; 234 tmpline[0] = '\0'; 235 (void) gethostname(hostname, sizeof (hostname)); 236 reply(220, "%s FTP server (%s) ready.", hostname, version); 237 (void) setjmp(errcatch); 238 for (;;) 239 (void) yyparse(); 240 /* NOTREACHED */ 241 } 242 243 lostconn() 244 { 245 246 if (debug) 247 syslog(LOG_DEBUG, "lost connection"); 248 dologout(-1); 249 } 250 251 static char ttyline[20]; 252 253 /* 254 * Helper function for sgetpwnam(). 255 */ 256 char * 257 sgetsave(s) 258 char *s; 259 { 260 char *malloc(); 261 char *new = malloc((unsigned) strlen(s) + 1); 262 263 if (new == NULL) { 264 perror_reply(421, "Local resource failure: malloc"); 265 dologout(1); 266 /* NOTREACHED */ 267 } 268 (void) strcpy(new, s); 269 return (new); 270 } 271 272 /* 273 * Save the result of a getpwnam. Used for USER command, since 274 * the data returned must not be clobbered by any other command 275 * (e.g., globbing). 276 */ 277 struct passwd * 278 sgetpwnam(name) 279 char *name; 280 { 281 static struct passwd save; 282 register struct passwd *p; 283 char *sgetsave(); 284 285 if ((p = getpwnam(name)) == NULL) 286 return (p); 287 if (save.pw_name) { 288 free(save.pw_name); 289 free(save.pw_passwd); 290 free(save.pw_gecos); 291 free(save.pw_dir); 292 free(save.pw_shell); 293 } 294 save = *p; 295 save.pw_name = sgetsave(p->pw_name); 296 save.pw_passwd = sgetsave(p->pw_passwd); 297 save.pw_gecos = sgetsave(p->pw_gecos); 298 save.pw_dir = sgetsave(p->pw_dir); 299 save.pw_shell = sgetsave(p->pw_shell); 300 return (&save); 301 } 302 303 int login_attempts; /* number of failed login attempts */ 304 int askpasswd; /* had user command, ask for passwd */ 305 306 /* 307 * USER command. 308 * Sets global passwd pointer pw if named account exists 309 * and is acceptable; sets askpasswd if a PASS command is 310 * expected. If logged in previously, need to reset state. 311 * If name is "ftp" or "anonymous", the name is not in /etc/ftpusers, 312 * and ftp account exists, set guest and pw, then just return. 313 * If account doesn't exist, ask for passwd anyway. 314 * Otherwise, check user requesting login privileges. 315 * Disallow anyone who does not have a standard 316 * shell as returned by getusershell(). 317 * Disallow anyone mentioned in the file _PATH_FTPUSERS 318 * to allow people such as root and uucp to be avoided. 319 */ 320 user(name) 321 char *name; 322 { 323 register char *cp; 324 FILE *fd; 325 char *shell; 326 char line[BUFSIZ], *getusershell(); 327 328 if (logged_in) { 329 if (guest) { 330 reply(530, "Can't change user from guest login."); 331 return; 332 } 333 end_login(); 334 } 335 336 guest = 0; 337 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 338 if (!checkuser("ftp") || !checkuser("anonymous")) 339 reply(530, "User %s access denied.", name); 340 else if ((pw = sgetpwnam("ftp")) != NULL) { 341 guest = 1; 342 askpasswd = 1; 343 reply(331, "Guest login ok, send ident as password."); 344 } else 345 reply(530, "User %s unknown.", name); 346 return; 347 } 348 if (pw = sgetpwnam(name)) { 349 if ((shell = pw->pw_shell) == NULL || *shell == 0) 350 shell = _PATH_BSHELL; 351 while ((cp = getusershell()) != NULL) 352 if (strcmp(cp, shell) == 0) 353 break; 354 endusershell(); 355 if (cp == NULL) { 356 reply(530, "User %s access denied.", name); 357 if (logging) 358 syslog(LOG_NOTICE, 359 "FTP LOGIN REFUSED FROM %s, %s", 360 remotehost, name); 361 pw = (struct passwd *) NULL; 362 return; 363 } 364 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 365 while (fgets(line, sizeof (line), fd) != NULL) { 366 if ((cp = index(line, '\n')) != NULL) 367 *cp = '\0'; 368 if (strcmp(line, name) == 0) { 369 reply(530, "User %s access denied.", name); 370 if (logging) 371 syslog(LOG_NOTICE, 372 "FTP LOGIN REFUSED FROM %s, %s", 373 remotehost, name); 374 pw = (struct passwd *) NULL; 375 (void) fclose(fd); 376 return; 377 } 378 } 379 (void) fclose(fd); 380 } 381 } 382 reply(331, "Password required for %s.", name); 383 askpasswd = 1; 384 /* 385 * Delay before reading passwd after first failed 386 * attempt to slow down passwd-guessing programs. 387 */ 388 if (login_attempts) 389 sleep((unsigned) login_attempts); 390 } 391 392 /* 393 * Terminate login as previous user, if any, resetting state; 394 * used when USER command is given or login fails. 395 */ 396 end_login() 397 { 398 399 (void) seteuid((uid_t)0); 400 if (logged_in) 401 logwtmp(ttyline, "", ""); 402 pw = NULL; 403 logged_in = 0; 404 guest = 0; 405 } 406 407 pass(passwd) 408 char *passwd; 409 { 410 char *xpasswd, *salt; 411 412 if (logged_in || askpasswd == 0) { 413 reply(503, "Login with USER first."); 414 return; 415 } 416 askpasswd = 0; 417 if (!guest) { /* "ftp" is only account allowed no password */ 418 if (pw == NULL) 419 salt = "xx"; 420 else 421 salt = pw->pw_passwd; 422 xpasswd = crypt(passwd, salt); 423 /* The strcmp does not catch null passwords! */ 424 if (pw == NULL || *pw->pw_passwd == '\0' || 425 strcmp(xpasswd, pw->pw_passwd)) { 426 reply(530, "Login incorrect."); 427 pw = NULL; 428 if (login_attempts++ >= 5) { 429 syslog(LOG_NOTICE, 430 "repeated login failures from %s", 431 remotehost); 432 exit(0); 433 } 434 return; 435 } 436 } 437 login_attempts = 0; /* this time successful */ 438 (void) setegid((gid_t)pw->pw_gid); 439 (void) initgroups(pw->pw_name, pw->pw_gid); 440 441 /* open wtmp before chroot */ 442 (void)sprintf(ttyline, "ftp%d", getpid()); 443 logwtmp(ttyline, pw->pw_name, remotehost); 444 logged_in = 1; 445 446 if (guest) { 447 /* 448 * We MUST do a chdir() after the chroot. Otherwise 449 * the old current directory will be accessible as "." 450 * outside the new root! 451 */ 452 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 453 reply(550, "Can't set guest privileges."); 454 goto bad; 455 } 456 } else if (chdir(pw->pw_dir) < 0) { 457 if (chdir("/") < 0) { 458 reply(530, "User %s: can't change directory to %s.", 459 pw->pw_name, pw->pw_dir); 460 goto bad; 461 } else 462 lreply(230, "No directory! Logging in with home=/"); 463 } 464 if (seteuid((uid_t)pw->pw_uid) < 0) { 465 reply(550, "Can't set uid."); 466 goto bad; 467 } 468 if (guest) { 469 reply(230, "Guest login ok, access restrictions apply."); 470 #ifdef SETPROCTITLE 471 sprintf(proctitle, "%s: anonymous/%.*s", remotehost, 472 sizeof(proctitle) - sizeof(remotehost) - 473 sizeof(": anonymous/"), passwd); 474 setproctitle(proctitle); 475 #endif /* SETPROCTITLE */ 476 if (logging) 477 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 478 remotehost, passwd); 479 } else { 480 reply(230, "User %s logged in.", pw->pw_name); 481 #ifdef SETPROCTITLE 482 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 483 setproctitle(proctitle); 484 #endif /* SETPROCTITLE */ 485 if (logging) 486 syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", 487 remotehost, pw->pw_name); 488 } 489 home = pw->pw_dir; /* home dir for globbing */ 490 (void) umask(defumask); 491 return; 492 bad: 493 /* Forget all about it... */ 494 end_login(); 495 } 496 497 retrieve(cmd, name) 498 char *cmd, *name; 499 { 500 FILE *fin, *dout; 501 struct stat st; 502 int (*closefunc)(); 503 504 if (cmd == 0) { 505 fin = fopen(name, "r"), closefunc = fclose; 506 st.st_size = 0; 507 } else { 508 char line[BUFSIZ]; 509 510 (void) sprintf(line, cmd, name), name = line; 511 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 512 st.st_size = -1; 513 st.st_blksize = BUFSIZ; 514 } 515 if (fin == NULL) { 516 if (errno != 0) 517 perror_reply(550, name); 518 return; 519 } 520 if (cmd == 0 && 521 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 522 reply(550, "%s: not a plain file.", name); 523 goto done; 524 } 525 if (restart_point) { 526 if (type == TYPE_A) { 527 register int i, n, c; 528 529 n = restart_point; 530 i = 0; 531 while (i++ < n) { 532 if ((c=getc(fin)) == EOF) { 533 perror_reply(550, name); 534 goto done; 535 } 536 if (c == '\n') 537 i++; 538 } 539 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 540 perror_reply(550, name); 541 goto done; 542 } 543 } 544 dout = dataconn(name, st.st_size, "w"); 545 if (dout == NULL) 546 goto done; 547 send_data(fin, dout, st.st_blksize); 548 (void) fclose(dout); 549 data = -1; 550 pdata = -1; 551 done: 552 (*closefunc)(fin); 553 } 554 555 store(name, mode, unique) 556 char *name, *mode; 557 int unique; 558 { 559 FILE *fout, *din; 560 struct stat st; 561 int (*closefunc)(); 562 char *gunique(); 563 564 if (unique && stat(name, &st) == 0 && 565 (name = gunique(name)) == NULL) 566 return; 567 568 if (restart_point) 569 mode = "r+w"; 570 fout = fopen(name, mode); 571 closefunc = fclose; 572 if (fout == NULL) { 573 perror_reply(553, name); 574 return; 575 } 576 if (restart_point) { 577 if (type == TYPE_A) { 578 register int i, n, c; 579 580 n = restart_point; 581 i = 0; 582 while (i++ < n) { 583 if ((c=getc(fout)) == EOF) { 584 perror_reply(550, name); 585 goto done; 586 } 587 if (c == '\n') 588 i++; 589 } 590 /* 591 * We must do this seek to "current" position 592 * because we are changing from reading to 593 * writing. 594 */ 595 if (fseek(fout, 0L, L_INCR) < 0) { 596 perror_reply(550, name); 597 goto done; 598 } 599 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 600 perror_reply(550, name); 601 goto done; 602 } 603 } 604 din = dataconn(name, (off_t)-1, "r"); 605 if (din == NULL) 606 goto done; 607 if (receive_data(din, fout) == 0) { 608 if (unique) 609 reply(226, "Transfer complete (unique file name:%s).", 610 name); 611 else 612 reply(226, "Transfer complete."); 613 } 614 (void) fclose(din); 615 data = -1; 616 pdata = -1; 617 done: 618 (*closefunc)(fout); 619 } 620 621 FILE * 622 getdatasock(mode) 623 char *mode; 624 { 625 int s, on = 1, tries; 626 627 if (data >= 0) 628 return (fdopen(data, mode)); 629 s = socket(AF_INET, SOCK_STREAM, 0); 630 if (s < 0) 631 return (NULL); 632 (void) seteuid((uid_t)0); 633 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 634 (char *) &on, sizeof (on)) < 0) 635 goto bad; 636 /* anchor socket to avoid multi-homing problems */ 637 data_source.sin_family = AF_INET; 638 data_source.sin_addr = ctrl_addr.sin_addr; 639 for (tries = 1; ; tries++) { 640 if (bind(s, (struct sockaddr *)&data_source, 641 sizeof (data_source)) >= 0) 642 break; 643 if (errno != EADDRINUSE || tries > 10) 644 goto bad; 645 sleep(tries); 646 } 647 (void) seteuid((uid_t)pw->pw_uid); 648 return (fdopen(s, mode)); 649 bad: 650 (void) seteuid((uid_t)pw->pw_uid); 651 (void) close(s); 652 return (NULL); 653 } 654 655 FILE * 656 dataconn(name, size, mode) 657 char *name; 658 off_t size; 659 char *mode; 660 { 661 char sizebuf[32]; 662 FILE *file; 663 int retry = 0; 664 665 file_size = size; 666 byte_count = 0; 667 if (size != (off_t) -1) 668 (void) sprintf (sizebuf, " (%ld bytes)", size); 669 else 670 (void) strcpy(sizebuf, ""); 671 if (pdata >= 0) { 672 struct sockaddr_in from; 673 int s, fromlen = sizeof(from); 674 675 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 676 if (s < 0) { 677 reply(425, "Can't open data connection."); 678 (void) close(pdata); 679 pdata = -1; 680 return(NULL); 681 } 682 (void) close(pdata); 683 pdata = s; 684 reply(150, "Opening %s mode data connection for %s%s.", 685 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 686 return(fdopen(pdata, mode)); 687 } 688 if (data >= 0) { 689 reply(125, "Using existing data connection for %s%s.", 690 name, sizebuf); 691 usedefault = 1; 692 return (fdopen(data, mode)); 693 } 694 if (usedefault) 695 data_dest = his_addr; 696 usedefault = 1; 697 file = getdatasock(mode); 698 if (file == NULL) { 699 reply(425, "Can't create data socket (%s,%d): %s.", 700 inet_ntoa(data_source.sin_addr), 701 ntohs(data_source.sin_port), 702 errno < sys_nerr ? sys_errlist[errno] : "unknown error"); 703 return (NULL); 704 } 705 data = fileno(file); 706 while (connect(data, (struct sockaddr *)&data_dest, 707 sizeof (data_dest)) < 0) { 708 if (errno == EADDRINUSE && retry < swaitmax) { 709 sleep((unsigned) swaitint); 710 retry += swaitint; 711 continue; 712 } 713 perror_reply(425, "Can't build data connection"); 714 (void) fclose(file); 715 data = -1; 716 return (NULL); 717 } 718 reply(150, "Opening %s mode data connection for %s%s.", 719 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 720 return (file); 721 } 722 723 /* 724 * Tranfer the contents of "instr" to 725 * "outstr" peer using the appropriate 726 * encapsulation of the data subject 727 * to Mode, Structure, and Type. 728 * 729 * NB: Form isn't handled. 730 */ 731 send_data(instr, outstr, blksize) 732 FILE *instr, *outstr; 733 off_t blksize; 734 { 735 register int c, cnt; 736 register char *buf; 737 int netfd, filefd; 738 739 transflag++; 740 if (setjmp(urgcatch)) { 741 transflag = 0; 742 return; 743 } 744 switch (type) { 745 746 case TYPE_A: 747 while ((c = getc(instr)) != EOF) { 748 byte_count++; 749 if (c == '\n') { 750 if (ferror(outstr)) 751 goto data_err; 752 (void) putc('\r', outstr); 753 } 754 (void) putc(c, outstr); 755 } 756 fflush(outstr); 757 transflag = 0; 758 if (ferror(instr)) 759 goto file_err; 760 if (ferror(outstr)) 761 goto data_err; 762 reply(226, "Transfer complete."); 763 return; 764 765 case TYPE_I: 766 case TYPE_L: 767 if ((buf = malloc((u_int)blksize)) == NULL) { 768 transflag = 0; 769 perror_reply(451, "Local resource failure: malloc"); 770 return; 771 } 772 netfd = fileno(outstr); 773 filefd = fileno(instr); 774 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 775 write(netfd, buf, cnt) == cnt) 776 byte_count += cnt; 777 transflag = 0; 778 (void)free(buf); 779 if (cnt != 0) { 780 if (cnt < 0) 781 goto file_err; 782 goto data_err; 783 } 784 reply(226, "Transfer complete."); 785 return; 786 default: 787 transflag = 0; 788 reply(550, "Unimplemented TYPE %d in send_data", type); 789 return; 790 } 791 792 data_err: 793 transflag = 0; 794 perror_reply(426, "Data connection"); 795 return; 796 797 file_err: 798 transflag = 0; 799 perror_reply(551, "Error on input file"); 800 } 801 802 /* 803 * Transfer data from peer to 804 * "outstr" using the appropriate 805 * encapulation of the data subject 806 * to Mode, Structure, and Type. 807 * 808 * N.B.: Form isn't handled. 809 */ 810 receive_data(instr, outstr) 811 FILE *instr, *outstr; 812 { 813 register int c; 814 int cnt, bare_lfs = 0; 815 char buf[BUFSIZ]; 816 817 transflag++; 818 if (setjmp(urgcatch)) { 819 transflag = 0; 820 return (-1); 821 } 822 switch (type) { 823 824 case TYPE_I: 825 case TYPE_L: 826 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 827 if (write(fileno(outstr), buf, cnt) != cnt) 828 goto file_err; 829 byte_count += cnt; 830 } 831 if (cnt < 0) 832 goto data_err; 833 transflag = 0; 834 return (0); 835 836 case TYPE_E: 837 reply(553, "TYPE E not implemented."); 838 transflag = 0; 839 return (-1); 840 841 case TYPE_A: 842 while ((c = getc(instr)) != EOF) { 843 byte_count++; 844 if (c == '\n') 845 bare_lfs++; 846 while (c == '\r') { 847 if (ferror(outstr)) 848 goto data_err; 849 if ((c = getc(instr)) != '\n') { 850 (void) putc ('\r', outstr); 851 if (c == '\0' || c == EOF) 852 goto contin2; 853 } 854 } 855 (void) putc(c, outstr); 856 contin2: ; 857 } 858 fflush(outstr); 859 if (ferror(instr)) 860 goto data_err; 861 if (ferror(outstr)) 862 goto file_err; 863 transflag = 0; 864 if (bare_lfs) { 865 lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 866 printf(" File may not have transferred correctly.\r\n"); 867 } 868 return (0); 869 default: 870 reply(550, "Unimplemented TYPE %d in receive_data", type); 871 transflag = 0; 872 return (-1); 873 } 874 875 data_err: 876 transflag = 0; 877 perror_reply(426, "Data Connection"); 878 return (-1); 879 880 file_err: 881 transflag = 0; 882 perror_reply(452, "Error writing file"); 883 return (-1); 884 } 885 886 statfilecmd(filename) 887 char *filename; 888 { 889 char line[BUFSIZ]; 890 FILE *fin; 891 int c; 892 893 (void) sprintf(line, "/bin/ls -lgA %s", filename); 894 fin = ftpd_popen(line, "r"); 895 lreply(211, "status of %s:", filename); 896 while ((c = getc(fin)) != EOF) { 897 if (c == '\n') { 898 if (ferror(stdout)){ 899 perror_reply(421, "control connection"); 900 (void) ftpd_pclose(fin); 901 dologout(1); 902 /* NOTREACHED */ 903 } 904 if (ferror(fin)) { 905 perror_reply(551, filename); 906 (void) ftpd_pclose(fin); 907 return; 908 } 909 (void) putc('\r', stdout); 910 } 911 (void) putc(c, stdout); 912 } 913 (void) ftpd_pclose(fin); 914 reply(211, "End of Status"); 915 } 916 917 statcmd() 918 { 919 struct sockaddr_in *sin; 920 u_char *a, *p; 921 922 lreply(211, "%s FTP server status:", hostname, version); 923 printf(" %s\r\n", version); 924 printf(" Connected to %s", remotehost); 925 if (!isdigit(remotehost[0])) 926 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 927 printf("\r\n"); 928 if (logged_in) { 929 if (guest) 930 printf(" Logged in anonymously\r\n"); 931 else 932 printf(" Logged in as %s\r\n", pw->pw_name); 933 } else if (askpasswd) 934 printf(" Waiting for password\r\n"); 935 else 936 printf(" Waiting for user name\r\n"); 937 printf(" TYPE: %s", typenames[type]); 938 if (type == TYPE_A || type == TYPE_E) 939 printf(", FORM: %s", formnames[form]); 940 if (type == TYPE_L) 941 #if NBBY == 8 942 printf(" %d", NBBY); 943 #else 944 printf(" %d", bytesize); /* need definition! */ 945 #endif 946 printf("; STRUcture: %s; transfer MODE: %s\r\n", 947 strunames[stru], modenames[mode]); 948 if (data != -1) 949 printf(" Data connection open\r\n"); 950 else if (pdata != -1) { 951 printf(" in Passive mode"); 952 sin = &pasv_addr; 953 goto printaddr; 954 } else if (usedefault == 0) { 955 printf(" PORT"); 956 sin = &data_dest; 957 printaddr: 958 a = (u_char *) &sin->sin_addr; 959 p = (u_char *) &sin->sin_port; 960 #define UC(b) (((int) b) & 0xff) 961 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 962 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 963 #undef UC 964 } else 965 printf(" No data connection\r\n"); 966 reply(211, "End of status"); 967 } 968 969 fatal(s) 970 char *s; 971 { 972 reply(451, "Error in server: %s\n", s); 973 reply(221, "Closing connection due to server error."); 974 dologout(0); 975 /* NOTREACHED */ 976 } 977 978 /* VARARGS2 */ 979 reply(n, fmt, p0, p1, p2, p3, p4, p5) 980 int n; 981 char *fmt; 982 { 983 printf("%d ", n); 984 printf(fmt, p0, p1, p2, p3, p4, p5); 985 printf("\r\n"); 986 (void)fflush(stdout); 987 if (debug) { 988 syslog(LOG_DEBUG, "<--- %d ", n); 989 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 990 } 991 } 992 993 /* VARARGS2 */ 994 lreply(n, fmt, p0, p1, p2, p3, p4, p5) 995 int n; 996 char *fmt; 997 { 998 printf("%d- ", n); 999 printf(fmt, p0, p1, p2, p3, p4, p5); 1000 printf("\r\n"); 1001 (void)fflush(stdout); 1002 if (debug) { 1003 syslog(LOG_DEBUG, "<--- %d- ", n); 1004 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 1005 } 1006 } 1007 1008 ack(s) 1009 char *s; 1010 { 1011 reply(250, "%s command successful.", s); 1012 } 1013 1014 nack(s) 1015 char *s; 1016 { 1017 reply(502, "%s command not implemented.", s); 1018 } 1019 1020 /* ARGSUSED */ 1021 yyerror(s) 1022 char *s; 1023 { 1024 char *cp; 1025 1026 if (cp = index(cbuf,'\n')) 1027 *cp = '\0'; 1028 reply(500, "'%s': command not understood.", cbuf); 1029 } 1030 1031 delete(name) 1032 char *name; 1033 { 1034 struct stat st; 1035 1036 if (stat(name, &st) < 0) { 1037 perror_reply(550, name); 1038 return; 1039 } 1040 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1041 if (rmdir(name) < 0) { 1042 perror_reply(550, name); 1043 return; 1044 } 1045 goto done; 1046 } 1047 if (unlink(name) < 0) { 1048 perror_reply(550, name); 1049 return; 1050 } 1051 done: 1052 ack("DELE"); 1053 } 1054 1055 cwd(path) 1056 char *path; 1057 { 1058 if (chdir(path) < 0) 1059 perror_reply(550, path); 1060 else 1061 ack("CWD"); 1062 } 1063 1064 makedir(name) 1065 char *name; 1066 { 1067 if (mkdir(name, 0777) < 0) 1068 perror_reply(550, name); 1069 else 1070 reply(257, "MKD command successful."); 1071 } 1072 1073 removedir(name) 1074 char *name; 1075 { 1076 if (rmdir(name) < 0) 1077 perror_reply(550, name); 1078 else 1079 ack("RMD"); 1080 } 1081 1082 pwd() 1083 { 1084 char path[MAXPATHLEN + 1]; 1085 extern char *getwd(); 1086 1087 if (getwd(path) == (char *)NULL) 1088 reply(550, "%s.", path); 1089 else 1090 reply(257, "\"%s\" is current directory.", path); 1091 } 1092 1093 char * 1094 renamefrom(name) 1095 char *name; 1096 { 1097 struct stat st; 1098 1099 if (stat(name, &st) < 0) { 1100 perror_reply(550, name); 1101 return ((char *)0); 1102 } 1103 reply(350, "File exists, ready for destination name"); 1104 return (name); 1105 } 1106 1107 renamecmd(from, to) 1108 char *from, *to; 1109 { 1110 if (rename(from, to) < 0) 1111 perror_reply(550, "rename"); 1112 else 1113 ack("RNTO"); 1114 } 1115 1116 dolog(sin) 1117 struct sockaddr_in *sin; 1118 { 1119 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1120 sizeof (struct in_addr), AF_INET); 1121 time_t t, time(); 1122 extern char *ctime(); 1123 1124 if (hp) 1125 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 1126 else 1127 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1128 sizeof (remotehost)); 1129 #ifdef SETPROCTITLE 1130 sprintf(proctitle, "%s: connected", remotehost); 1131 setproctitle(proctitle); 1132 #endif /* SETPROCTITLE */ 1133 1134 if (logging) { 1135 t = time((time_t *) 0); 1136 syslog(LOG_INFO, "connection from %s at %s", 1137 remotehost, ctime(&t)); 1138 } 1139 } 1140 1141 /* 1142 * Record logout in wtmp file 1143 * and exit with supplied status. 1144 */ 1145 dologout(status) 1146 int status; 1147 { 1148 if (logged_in) { 1149 (void) seteuid((uid_t)0); 1150 logwtmp(ttyline, "", ""); 1151 } 1152 /* beware of flushing buffers after a SIGPIPE */ 1153 _exit(status); 1154 } 1155 1156 myoob() 1157 { 1158 char *cp; 1159 1160 /* only process if transfer occurring */ 1161 if (!transflag) 1162 return; 1163 cp = tmpline; 1164 if (getline(cp, 7, stdin) == NULL) { 1165 reply(221, "You could at least say goodbye."); 1166 dologout(0); 1167 } 1168 upper(cp); 1169 if (strcmp(cp, "ABOR\r\n") == 0) { 1170 tmpline[0] = '\0'; 1171 reply(426, "Transfer aborted. Data connection closed."); 1172 reply(226, "Abort successful"); 1173 longjmp(urgcatch, 1); 1174 } 1175 if (strcmp(cp, "STAT\r\n") == 0) { 1176 if (file_size != (off_t) -1) 1177 reply(213, "Status: %lu of %lu bytes transferred", 1178 byte_count, file_size); 1179 else 1180 reply(213, "Status: %lu bytes transferred", byte_count); 1181 } 1182 } 1183 1184 /* 1185 * Note: a response of 425 is not mentioned as a possible response to 1186 * the PASV command in RFC959. However, it has been blessed as 1187 * a legitimate response by Jon Postel in a telephone conversation 1188 * with Rick Adams on 25 Jan 89. 1189 */ 1190 passive() 1191 { 1192 int len; 1193 register char *p, *a; 1194 1195 pdata = socket(AF_INET, SOCK_STREAM, 0); 1196 if (pdata < 0) { 1197 perror_reply(425, "Can't open passive connection"); 1198 return; 1199 } 1200 pasv_addr = ctrl_addr; 1201 pasv_addr.sin_port = 0; 1202 (void) seteuid((uid_t)0); 1203 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1204 (void) seteuid((uid_t)pw->pw_uid); 1205 goto pasv_error; 1206 } 1207 (void) seteuid((uid_t)pw->pw_uid); 1208 len = sizeof(pasv_addr); 1209 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1210 goto pasv_error; 1211 if (listen(pdata, 1) < 0) 1212 goto pasv_error; 1213 a = (char *) &pasv_addr.sin_addr; 1214 p = (char *) &pasv_addr.sin_port; 1215 1216 #define UC(b) (((int) b) & 0xff) 1217 1218 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1219 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1220 return; 1221 1222 pasv_error: 1223 (void) close(pdata); 1224 pdata = -1; 1225 perror_reply(425, "Can't open passive connection"); 1226 return; 1227 } 1228 1229 /* 1230 * Generate unique name for file with basename "local". 1231 * The file named "local" is already known to exist. 1232 * Generates failure reply on error. 1233 */ 1234 char * 1235 gunique(local) 1236 char *local; 1237 { 1238 static char new[MAXPATHLEN]; 1239 struct stat st; 1240 char *cp = rindex(local, '/'); 1241 int count = 0; 1242 1243 if (cp) 1244 *cp = '\0'; 1245 if (stat(cp ? local : ".", &st) < 0) { 1246 perror_reply(553, cp ? local : "."); 1247 return((char *) 0); 1248 } 1249 if (cp) 1250 *cp = '/'; 1251 (void) strcpy(new, local); 1252 cp = new + strlen(new); 1253 *cp++ = '.'; 1254 for (count = 1; count < 100; count++) { 1255 (void) sprintf(cp, "%d", count); 1256 if (stat(new, &st) < 0) 1257 return(new); 1258 } 1259 reply(452, "Unique file name cannot be created."); 1260 return((char *) 0); 1261 } 1262 1263 /* 1264 * Format and send reply containing system error number. 1265 */ 1266 perror_reply(code, string) 1267 int code; 1268 char *string; 1269 { 1270 if (errno < sys_nerr) 1271 reply(code, "%s: %s.", string, sys_errlist[errno]); 1272 else 1273 reply(code, "%s: unknown error %d.", string, errno); 1274 } 1275 1276 static char *onefile[] = { 1277 "", 1278 0 1279 }; 1280 1281 send_file_list(whichfiles) 1282 char *whichfiles; 1283 { 1284 struct stat st; 1285 DIR *dirp = NULL; 1286 struct direct *dir; 1287 FILE *dout = NULL; 1288 register char **dirlist, *dirname; 1289 int simple = 0; 1290 char *strpbrk(); 1291 1292 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1293 extern char **glob(), *globerr; 1294 1295 globerr = NULL; 1296 dirlist = glob(whichfiles); 1297 if (globerr != NULL) { 1298 reply(550, globerr); 1299 return; 1300 } else if (dirlist == NULL) { 1301 errno = ENOENT; 1302 perror_reply(550, whichfiles); 1303 return; 1304 } 1305 } else { 1306 onefile[0] = whichfiles; 1307 dirlist = onefile; 1308 simple = 1; 1309 } 1310 1311 if (setjmp(urgcatch)) { 1312 transflag = 0; 1313 return; 1314 } 1315 while (dirname = *dirlist++) { 1316 if (stat(dirname, &st) < 0) { 1317 /* 1318 * If user typed "ls -l", etc, and the client 1319 * used NLST, do what the user meant. 1320 */ 1321 if (dirname[0] == '-' && *dirlist == NULL && 1322 transflag == 0) { 1323 retrieve("/bin/ls %s", dirname); 1324 return; 1325 } 1326 perror_reply(550, whichfiles); 1327 if (dout != NULL) { 1328 (void) fclose(dout); 1329 transflag = 0; 1330 data = -1; 1331 pdata = -1; 1332 } 1333 return; 1334 } 1335 1336 if ((st.st_mode&S_IFMT) == S_IFREG) { 1337 if (dout == NULL) { 1338 dout = dataconn("file list", (off_t)-1, "w"); 1339 if (dout == NULL) 1340 return; 1341 transflag++; 1342 } 1343 fprintf(dout, "%s%s\n", dirname, 1344 type == TYPE_A ? "\r" : ""); 1345 byte_count += strlen(dirname) + 1; 1346 continue; 1347 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1348 continue; 1349 1350 if ((dirp = opendir(dirname)) == NULL) 1351 continue; 1352 1353 while ((dir = readdir(dirp)) != NULL) { 1354 char nbuf[MAXPATHLEN]; 1355 1356 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1357 continue; 1358 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1359 dir->d_namlen == 2) 1360 continue; 1361 1362 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1363 1364 /* 1365 * We have to do a stat to insure it's 1366 * not a directory or special file. 1367 */ 1368 if (simple || (stat(nbuf, &st) == 0 && 1369 (st.st_mode&S_IFMT) == S_IFREG)) { 1370 if (dout == NULL) { 1371 dout = dataconn("file list", (off_t)-1, 1372 "w"); 1373 if (dout == NULL) 1374 return; 1375 transflag++; 1376 } 1377 if (nbuf[0] == '.' && nbuf[1] == '/') 1378 fprintf(dout, "%s%s\n", &nbuf[2], 1379 type == TYPE_A ? "\r" : ""); 1380 else 1381 fprintf(dout, "%s%s\n", nbuf, 1382 type == TYPE_A ? "\r" : ""); 1383 byte_count += strlen(nbuf) + 1; 1384 } 1385 } 1386 (void) closedir(dirp); 1387 } 1388 1389 if (dout == NULL) 1390 reply(550, "No files found."); 1391 else if (ferror(dout) != 0) 1392 perror_reply(550, "Data connection"); 1393 else 1394 reply(226, "Transfer complete."); 1395 1396 transflag = 0; 1397 if (dout != NULL) 1398 (void) fclose(dout); 1399 data = -1; 1400 pdata = -1; 1401 } 1402 1403 #ifdef SETPROCTITLE 1404 /* 1405 * clobber argv so ps will show what we're doing. 1406 * (stolen from sendmail) 1407 * warning, since this is usually started from inetd.conf, it 1408 * often doesn't have much of an environment or arglist to overwrite. 1409 */ 1410 1411 /*VARARGS1*/ 1412 setproctitle(fmt, a, b, c) 1413 char *fmt; 1414 { 1415 register char *p, *bp, ch; 1416 register int i; 1417 char buf[BUFSIZ]; 1418 1419 (void) sprintf(buf, fmt, a, b, c); 1420 1421 /* make ps print our process name */ 1422 p = Argv[0]; 1423 *p++ = '-'; 1424 1425 i = strlen(buf); 1426 if (i > LastArgv - p - 2) { 1427 i = LastArgv - p - 2; 1428 buf[i] = '\0'; 1429 } 1430 bp = buf; 1431 while (ch = *bp++) 1432 if (ch != '\n' && ch != '\r') 1433 *p++ = ch; 1434 while (p < LastArgv) 1435 *p++ = ' '; 1436 } 1437 #endif /* SETPROCTITLE */ 1438