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 5.35 (Berkeley) 05/28/90"; 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 <string.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 *crypt(); 65 extern char version[]; 66 extern char *home; /* pointer to home directory for glob */ 67 extern FILE *ftpd_popen(), *fopen(), *freopen(); 68 extern int ftpd_pclose(), fclose(); 69 extern char *getline(); 70 extern char cbuf[]; 71 extern off_t restart_point; 72 73 struct sockaddr_in ctrl_addr; 74 struct sockaddr_in data_source; 75 struct sockaddr_in data_dest; 76 struct sockaddr_in his_addr; 77 struct sockaddr_in pasv_addr; 78 79 int data; 80 jmp_buf errcatch, urgcatch; 81 int logged_in; 82 struct passwd *pw; 83 int debug; 84 int timeout = 900; /* timeout after 15 minutes of inactivity */ 85 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 86 int logging; 87 int guest; 88 int type; 89 int form; 90 int stru; /* avoid C keyword */ 91 int mode; 92 int usedefault = 1; /* for data transfers */ 93 int pdata = -1; /* for passive mode */ 94 int transflag; 95 off_t file_size; 96 off_t byte_count; 97 #if !defined(CMASK) || CMASK == 0 98 #undef CMASK 99 #define CMASK 027 100 #endif 101 int defumask = CMASK; /* default umask value */ 102 char tmpline[7]; 103 char hostname[MAXHOSTNAMELEN]; 104 char remotehost[MAXHOSTNAMELEN]; 105 106 /* 107 * Timeout intervals for retrying connections 108 * to hosts that don't accept PORT cmds. This 109 * is a kludge, but given the problems with TCP... 110 */ 111 #define SWAITMAX 90 /* wait at most 90 seconds */ 112 #define SWAITINT 5 /* interval between retries */ 113 114 int swaitmax = SWAITMAX; 115 int swaitint = SWAITINT; 116 117 int lostconn(); 118 int myoob(); 119 FILE *getdatasock(), *dataconn(); 120 121 #ifdef SETPROCTITLE 122 char **Argv = NULL; /* pointer to argument vector */ 123 char *LastArgv = NULL; /* end of argv */ 124 char proctitle[BUFSIZ]; /* initial part of title */ 125 #endif /* SETPROCTITLE */ 126 127 main(argc, argv, envp) 128 int argc; 129 char *argv[]; 130 char **envp; 131 { 132 int addrlen, on = 1; 133 char *cp; 134 135 addrlen = sizeof (his_addr); 136 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 137 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 138 exit(1); 139 } 140 addrlen = sizeof (ctrl_addr); 141 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 142 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 143 exit(1); 144 } 145 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 146 debug = 0; 147 openlog("ftpd", LOG_PID, LOG_DAEMON); 148 #ifdef SETPROCTITLE 149 /* 150 * Save start and extent of argv for setproctitle. 151 */ 152 Argv = argv; 153 while (*envp) 154 envp++; 155 LastArgv = envp[-1] + strlen(envp[-1]); 156 #endif /* SETPROCTITLE */ 157 158 argc--, argv++; 159 while (argc > 0 && *argv[0] == '-') { 160 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 161 162 case 'v': 163 debug = 1; 164 break; 165 166 case 'd': 167 debug = 1; 168 break; 169 170 case 'l': 171 logging = 1; 172 break; 173 174 case 't': 175 timeout = atoi(++cp); 176 if (maxtimeout < timeout) 177 maxtimeout = timeout; 178 goto nextopt; 179 180 case 'T': 181 maxtimeout = atoi(++cp); 182 if (timeout > maxtimeout) 183 timeout = maxtimeout; 184 goto nextopt; 185 186 case 'u': 187 { 188 int val = 0; 189 190 while (*++cp && *cp >= '0' && *cp <= '9') 191 val = val*8 + *cp - '0'; 192 if (*cp) 193 fprintf(stderr, "ftpd: Bad value for -u\n"); 194 else 195 defumask = val; 196 goto nextopt; 197 } 198 199 default: 200 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 201 *cp); 202 break; 203 } 204 nextopt: 205 argc--, argv++; 206 } 207 (void) freopen(_PATH_DEVNULL, "w", stderr); 208 (void) signal(SIGPIPE, lostconn); 209 (void) signal(SIGCHLD, SIG_IGN); 210 if ((int)signal(SIGURG, myoob) < 0) 211 syslog(LOG_ERR, "signal: %m"); 212 213 /* Try to handle urgent data inline */ 214 #ifdef SO_OOBINLINE 215 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 216 syslog(LOG_ERR, "setsockopt: %m"); 217 #endif 218 219 #ifdef F_SETOWN 220 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 221 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 222 #endif 223 dolog(&his_addr); 224 /* 225 * Set up default state 226 */ 227 data = -1; 228 type = TYPE_A; 229 form = FORM_N; 230 stru = STRU_F; 231 mode = MODE_S; 232 tmpline[0] = '\0'; 233 (void) gethostname(hostname, sizeof (hostname)); 234 reply(220, "%s FTP server (%s) ready.", hostname, version); 235 (void) setjmp(errcatch); 236 for (;;) 237 (void) yyparse(); 238 /* NOTREACHED */ 239 } 240 241 lostconn() 242 { 243 244 if (debug) 245 syslog(LOG_DEBUG, "lost connection"); 246 dologout(-1); 247 } 248 249 static char ttyline[20]; 250 251 /* 252 * Helper function for sgetpwnam(). 253 */ 254 char * 255 sgetsave(s) 256 char *s; 257 { 258 char *malloc(); 259 char *new = malloc((unsigned) strlen(s) + 1); 260 261 if (new == NULL) { 262 perror_reply(421, "Local resource failure: malloc"); 263 dologout(1); 264 /* NOTREACHED */ 265 } 266 (void) strcpy(new, s); 267 return (new); 268 } 269 270 /* 271 * Save the result of a getpwnam. Used for USER command, since 272 * the data returned must not be clobbered by any other command 273 * (e.g., globbing). 274 */ 275 struct passwd * 276 sgetpwnam(name) 277 char *name; 278 { 279 static struct passwd save; 280 register struct passwd *p; 281 char *sgetsave(); 282 283 if ((p = getpwnam(name)) == NULL) 284 return (p); 285 if (save.pw_name) { 286 free(save.pw_name); 287 free(save.pw_passwd); 288 free(save.pw_gecos); 289 free(save.pw_dir); 290 free(save.pw_shell); 291 } 292 save = *p; 293 save.pw_name = sgetsave(p->pw_name); 294 save.pw_passwd = sgetsave(p->pw_passwd); 295 save.pw_gecos = sgetsave(p->pw_gecos); 296 save.pw_dir = sgetsave(p->pw_dir); 297 save.pw_shell = sgetsave(p->pw_shell); 298 return (&save); 299 } 300 301 int login_attempts; /* number of failed login attempts */ 302 int askpasswd; /* had user command, ask for passwd */ 303 304 /* 305 * USER command. 306 * Sets global passwd pointer pw if named account exists and is acceptable; 307 * sets askpasswd if a PASS command is expected. If logged in previously, 308 * need to reset state. If name is "ftp" or "anonymous", the name is not in 309 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 310 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 311 * requesting login privileges. Disallow anyone who does not have a standard 312 * shell as returned by getusershell(). Disallow anyone mentioned in the file 313 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 314 */ 315 user(name) 316 char *name; 317 { 318 register char *cp; 319 char *shell; 320 char *getusershell(); 321 322 if (logged_in) { 323 if (guest) { 324 reply(530, "Can't change user from guest login."); 325 return; 326 } 327 end_login(); 328 } 329 330 guest = 0; 331 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 332 if (checkuser("ftp") || checkuser("anonymous")) 333 reply(530, "User %s access denied.", name); 334 else if ((pw = sgetpwnam("ftp")) != NULL) { 335 guest = 1; 336 askpasswd = 1; 337 reply(331, "Guest login ok, send ident as password."); 338 } else 339 reply(530, "User %s unknown.", name); 340 return; 341 } 342 if (pw = sgetpwnam(name)) { 343 if ((shell = pw->pw_shell) == NULL || *shell == 0) 344 shell = _PATH_BSHELL; 345 while ((cp = getusershell()) != NULL) 346 if (strcmp(cp, shell) == 0) 347 break; 348 endusershell(); 349 if (cp == NULL || checkuser(name)) { 350 reply(530, "User %s access denied.", name); 351 if (logging) 352 syslog(LOG_NOTICE, 353 "FTP LOGIN REFUSED FROM %s, %s", 354 remotehost, name); 355 pw = (struct passwd *) NULL; 356 return; 357 } 358 } 359 reply(331, "Password required for %s.", name); 360 askpasswd = 1; 361 /* 362 * Delay before reading passwd after first failed 363 * attempt to slow down passwd-guessing programs. 364 */ 365 if (login_attempts) 366 sleep((unsigned) login_attempts); 367 } 368 369 /* 370 * Check if a user is in the file _PATH_FTPUSERS 371 */ 372 checkuser(name) 373 char *name; 374 { 375 register FILE *fd; 376 register char *p; 377 char line[BUFSIZ]; 378 379 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 380 while (fgets(line, sizeof(line), fd) != NULL) 381 if ((p = index(line, '\n')) != NULL) { 382 *p = '\0'; 383 if (line[0] == '#') 384 continue; 385 if (strcmp(line, name) == 0) 386 return (1); 387 } 388 (void) fclose(fd); 389 } 390 return (0); 391 } 392 393 /* 394 * Terminate login as previous user, if any, resetting state; 395 * used when USER command is given or login fails. 396 */ 397 end_login() 398 { 399 400 (void) seteuid((uid_t)0); 401 if (logged_in) 402 logwtmp(ttyline, "", ""); 403 pw = NULL; 404 logged_in = 0; 405 guest = 0; 406 } 407 408 pass(passwd) 409 char *passwd; 410 { 411 char *xpasswd, *salt; 412 413 if (logged_in || askpasswd == 0) { 414 reply(503, "Login with USER first."); 415 return; 416 } 417 askpasswd = 0; 418 if (!guest) { /* "ftp" is only account allowed no password */ 419 if (pw == NULL) 420 salt = "xx"; 421 else 422 salt = pw->pw_passwd; 423 xpasswd = crypt(passwd, salt); 424 /* The strcmp does not catch null passwords! */ 425 if (pw == NULL || *pw->pw_passwd == '\0' || 426 strcmp(xpasswd, pw->pw_passwd)) { 427 reply(530, "Login incorrect."); 428 pw = NULL; 429 if (login_attempts++ >= 5) { 430 syslog(LOG_NOTICE, 431 "repeated login failures from %s", 432 remotehost); 433 exit(0); 434 } 435 return; 436 } 437 } 438 login_attempts = 0; /* this time successful */ 439 (void) setegid((gid_t)pw->pw_gid); 440 (void) initgroups(pw->pw_name, pw->pw_gid); 441 442 /* open wtmp before chroot */ 443 (void)sprintf(ttyline, "ftp%d", getpid()); 444 logwtmp(ttyline, pw->pw_name, remotehost); 445 logged_in = 1; 446 447 if (guest) { 448 /* 449 * We MUST do a chdir() after the chroot. Otherwise 450 * the old current directory will be accessible as "." 451 * outside the new root! 452 */ 453 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 454 reply(550, "Can't set guest privileges."); 455 goto bad; 456 } 457 } else if (chdir(pw->pw_dir) < 0) { 458 if (chdir("/") < 0) { 459 reply(530, "User %s: can't change directory to %s.", 460 pw->pw_name, pw->pw_dir); 461 goto bad; 462 } else 463 lreply(230, "No directory! Logging in with home=/"); 464 } 465 if (seteuid((uid_t)pw->pw_uid) < 0) { 466 reply(550, "Can't set uid."); 467 goto bad; 468 } 469 if (guest) { 470 reply(230, "Guest login ok, access restrictions apply."); 471 #ifdef SETPROCTITLE 472 sprintf(proctitle, "%s: anonymous/%.*s", remotehost, 473 sizeof(proctitle) - sizeof(remotehost) - 474 sizeof(": anonymous/"), passwd); 475 setproctitle(proctitle); 476 #endif /* SETPROCTITLE */ 477 if (logging) 478 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 479 remotehost, passwd); 480 } else { 481 reply(230, "User %s logged in.", pw->pw_name); 482 #ifdef SETPROCTITLE 483 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 484 setproctitle(proctitle); 485 #endif /* SETPROCTITLE */ 486 if (logging) 487 syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", 488 remotehost, pw->pw_name); 489 } 490 home = pw->pw_dir; /* home dir for globbing */ 491 (void) umask(defumask); 492 return; 493 bad: 494 /* Forget all about it... */ 495 end_login(); 496 } 497 498 retrieve(cmd, name) 499 char *cmd, *name; 500 { 501 FILE *fin, *dout; 502 struct stat st; 503 int (*closefunc)(); 504 505 if (cmd == 0) { 506 fin = fopen(name, "r"), closefunc = fclose; 507 st.st_size = 0; 508 } else { 509 char line[BUFSIZ]; 510 511 (void) sprintf(line, cmd, name), name = line; 512 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 513 st.st_size = -1; 514 st.st_blksize = BUFSIZ; 515 } 516 if (fin == NULL) { 517 if (errno != 0) 518 perror_reply(550, name); 519 return; 520 } 521 if (cmd == 0 && 522 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 523 reply(550, "%s: not a plain file.", name); 524 goto done; 525 } 526 if (restart_point) { 527 if (type == TYPE_A) { 528 register int i, n, c; 529 530 n = restart_point; 531 i = 0; 532 while (i++ < n) { 533 if ((c=getc(fin)) == EOF) { 534 perror_reply(550, name); 535 goto done; 536 } 537 if (c == '\n') 538 i++; 539 } 540 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 541 perror_reply(550, name); 542 goto done; 543 } 544 } 545 dout = dataconn(name, st.st_size, "w"); 546 if (dout == NULL) 547 goto done; 548 send_data(fin, dout, st.st_blksize); 549 (void) fclose(dout); 550 data = -1; 551 pdata = -1; 552 done: 553 (*closefunc)(fin); 554 } 555 556 store(name, mode, unique) 557 char *name, *mode; 558 int unique; 559 { 560 FILE *fout, *din; 561 struct stat st; 562 int (*closefunc)(); 563 char *gunique(); 564 565 if (unique && stat(name, &st) == 0 && 566 (name = gunique(name)) == NULL) 567 return; 568 569 if (restart_point) 570 mode = "r+w"; 571 fout = fopen(name, mode); 572 closefunc = fclose; 573 if (fout == NULL) { 574 perror_reply(553, name); 575 return; 576 } 577 if (restart_point) { 578 if (type == TYPE_A) { 579 register int i, n, c; 580 581 n = restart_point; 582 i = 0; 583 while (i++ < n) { 584 if ((c=getc(fout)) == EOF) { 585 perror_reply(550, name); 586 goto done; 587 } 588 if (c == '\n') 589 i++; 590 } 591 /* 592 * We must do this seek to "current" position 593 * because we are changing from reading to 594 * writing. 595 */ 596 if (fseek(fout, 0L, L_INCR) < 0) { 597 perror_reply(550, name); 598 goto done; 599 } 600 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 601 perror_reply(550, name); 602 goto done; 603 } 604 } 605 din = dataconn(name, (off_t)-1, "r"); 606 if (din == NULL) 607 goto done; 608 if (receive_data(din, fout) == 0) { 609 if (unique) 610 reply(226, "Transfer complete (unique file name:%s).", 611 name); 612 else 613 reply(226, "Transfer complete."); 614 } 615 (void) fclose(din); 616 data = -1; 617 pdata = -1; 618 done: 619 (*closefunc)(fout); 620 } 621 622 FILE * 623 getdatasock(mode) 624 char *mode; 625 { 626 int s, on = 1, tries; 627 628 if (data >= 0) 629 return (fdopen(data, mode)); 630 s = socket(AF_INET, SOCK_STREAM, 0); 631 if (s < 0) 632 return (NULL); 633 (void) seteuid((uid_t)0); 634 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 635 (char *) &on, sizeof (on)) < 0) 636 goto bad; 637 /* anchor socket to avoid multi-homing problems */ 638 data_source.sin_family = AF_INET; 639 data_source.sin_addr = ctrl_addr.sin_addr; 640 for (tries = 1; ; tries++) { 641 if (bind(s, (struct sockaddr *)&data_source, 642 sizeof (data_source)) >= 0) 643 break; 644 if (errno != EADDRINUSE || tries > 10) 645 goto bad; 646 sleep(tries); 647 } 648 (void) seteuid((uid_t)pw->pw_uid); 649 return (fdopen(s, mode)); 650 bad: 651 (void) seteuid((uid_t)pw->pw_uid); 652 (void) close(s); 653 return (NULL); 654 } 655 656 FILE * 657 dataconn(name, size, mode) 658 char *name; 659 off_t size; 660 char *mode; 661 { 662 char sizebuf[32]; 663 FILE *file; 664 int retry = 0; 665 666 file_size = size; 667 byte_count = 0; 668 if (size != (off_t) -1) 669 (void) sprintf (sizebuf, " (%ld bytes)", size); 670 else 671 (void) strcpy(sizebuf, ""); 672 if (pdata >= 0) { 673 struct sockaddr_in from; 674 int s, fromlen = sizeof(from); 675 676 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 677 if (s < 0) { 678 reply(425, "Can't open data connection."); 679 (void) close(pdata); 680 pdata = -1; 681 return(NULL); 682 } 683 (void) close(pdata); 684 pdata = s; 685 reply(150, "Opening %s mode data connection for %s%s.", 686 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 687 return(fdopen(pdata, mode)); 688 } 689 if (data >= 0) { 690 reply(125, "Using existing data connection for %s%s.", 691 name, sizebuf); 692 usedefault = 1; 693 return (fdopen(data, mode)); 694 } 695 if (usedefault) 696 data_dest = his_addr; 697 usedefault = 1; 698 file = getdatasock(mode); 699 if (file == NULL) { 700 reply(425, "Can't create data socket (%s,%d): %s.", 701 inet_ntoa(data_source.sin_addr), 702 ntohs(data_source.sin_port), strerror(errno)); 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 reply(code, "%s: %s.", string, strerror(errno)); 1271 } 1272 1273 static char *onefile[] = { 1274 "", 1275 0 1276 }; 1277 1278 send_file_list(whichfiles) 1279 char *whichfiles; 1280 { 1281 struct stat st; 1282 DIR *dirp = NULL; 1283 struct direct *dir; 1284 FILE *dout = NULL; 1285 register char **dirlist, *dirname; 1286 int simple = 0; 1287 char *strpbrk(); 1288 1289 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1290 extern char **glob(), *globerr; 1291 1292 globerr = NULL; 1293 dirlist = glob(whichfiles); 1294 if (globerr != NULL) { 1295 reply(550, globerr); 1296 return; 1297 } else if (dirlist == NULL) { 1298 errno = ENOENT; 1299 perror_reply(550, whichfiles); 1300 return; 1301 } 1302 } else { 1303 onefile[0] = whichfiles; 1304 dirlist = onefile; 1305 simple = 1; 1306 } 1307 1308 if (setjmp(urgcatch)) { 1309 transflag = 0; 1310 return; 1311 } 1312 while (dirname = *dirlist++) { 1313 if (stat(dirname, &st) < 0) { 1314 /* 1315 * If user typed "ls -l", etc, and the client 1316 * used NLST, do what the user meant. 1317 */ 1318 if (dirname[0] == '-' && *dirlist == NULL && 1319 transflag == 0) { 1320 retrieve("/bin/ls %s", dirname); 1321 return; 1322 } 1323 perror_reply(550, whichfiles); 1324 if (dout != NULL) { 1325 (void) fclose(dout); 1326 transflag = 0; 1327 data = -1; 1328 pdata = -1; 1329 } 1330 return; 1331 } 1332 1333 if ((st.st_mode&S_IFMT) == S_IFREG) { 1334 if (dout == NULL) { 1335 dout = dataconn("file list", (off_t)-1, "w"); 1336 if (dout == NULL) 1337 return; 1338 transflag++; 1339 } 1340 fprintf(dout, "%s%s\n", dirname, 1341 type == TYPE_A ? "\r" : ""); 1342 byte_count += strlen(dirname) + 1; 1343 continue; 1344 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1345 continue; 1346 1347 if ((dirp = opendir(dirname)) == NULL) 1348 continue; 1349 1350 while ((dir = readdir(dirp)) != NULL) { 1351 char nbuf[MAXPATHLEN]; 1352 1353 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1354 continue; 1355 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1356 dir->d_namlen == 2) 1357 continue; 1358 1359 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1360 1361 /* 1362 * We have to do a stat to insure it's 1363 * not a directory or special file. 1364 */ 1365 if (simple || (stat(nbuf, &st) == 0 && 1366 (st.st_mode&S_IFMT) == S_IFREG)) { 1367 if (dout == NULL) { 1368 dout = dataconn("file list", (off_t)-1, 1369 "w"); 1370 if (dout == NULL) 1371 return; 1372 transflag++; 1373 } 1374 if (nbuf[0] == '.' && nbuf[1] == '/') 1375 fprintf(dout, "%s%s\n", &nbuf[2], 1376 type == TYPE_A ? "\r" : ""); 1377 else 1378 fprintf(dout, "%s%s\n", nbuf, 1379 type == TYPE_A ? "\r" : ""); 1380 byte_count += strlen(nbuf) + 1; 1381 } 1382 } 1383 (void) closedir(dirp); 1384 } 1385 1386 if (dout == NULL) 1387 reply(550, "No files found."); 1388 else if (ferror(dout) != 0) 1389 perror_reply(550, "Data connection"); 1390 else 1391 reply(226, "Transfer complete."); 1392 1393 transflag = 0; 1394 if (dout != NULL) 1395 (void) fclose(dout); 1396 data = -1; 1397 pdata = -1; 1398 } 1399 1400 #ifdef SETPROCTITLE 1401 /* 1402 * clobber argv so ps will show what we're doing. 1403 * (stolen from sendmail) 1404 * warning, since this is usually started from inetd.conf, it 1405 * often doesn't have much of an environment or arglist to overwrite. 1406 */ 1407 1408 /*VARARGS1*/ 1409 setproctitle(fmt, a, b, c) 1410 char *fmt; 1411 { 1412 register char *p, *bp, ch; 1413 register int i; 1414 char buf[BUFSIZ]; 1415 1416 (void) sprintf(buf, fmt, a, b, c); 1417 1418 /* make ps print our process name */ 1419 p = Argv[0]; 1420 *p++ = '-'; 1421 1422 i = strlen(buf); 1423 if (i > LastArgv - p - 2) { 1424 i = LastArgv - p - 2; 1425 buf[i] = '\0'; 1426 } 1427 bp = buf; 1428 while (ch = *bp++) 1429 if (ch != '\n' && ch != '\r') 1430 *p++ = ch; 1431 while (p < LastArgv) 1432 *p++ = ' '; 1433 } 1434 #endif /* SETPROCTITLE */ 1435