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 5.32 (Berkeley) 02/20/90"; 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 char *shell; 325 char *getusershell(); 326 327 if (logged_in) { 328 if (guest) { 329 reply(530, "Can't change user from guest login."); 330 return; 331 } 332 end_login(); 333 } 334 335 guest = 0; 336 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 337 if (checkuser("ftp") || checkuser("anonymous")) 338 reply(530, "User %s access denied.", name); 339 else if ((pw = sgetpwnam("ftp")) != NULL) { 340 guest = 1; 341 askpasswd = 1; 342 reply(331, "Guest login ok, send ident as password."); 343 } else 344 reply(530, "User %s unknown.", name); 345 return; 346 } 347 if (pw = sgetpwnam(name)) { 348 if ((shell = pw->pw_shell) == NULL || *shell == 0) 349 shell = _PATH_BSHELL; 350 while ((cp = getusershell()) != NULL) 351 if (strcmp(cp, shell) == 0) 352 break; 353 endusershell(); 354 if (cp == NULL || checkuser(name)) { 355 reply(530, "User %s access denied.", name); 356 if (logging) 357 syslog(LOG_NOTICE, 358 "FTP LOGIN REFUSED FROM %s, %s", 359 remotehost, name); 360 pw = (struct passwd *) NULL; 361 return; 362 } 363 } 364 reply(331, "Password required for %s.", name); 365 askpasswd = 1; 366 /* 367 * Delay before reading passwd after first failed 368 * attempt to slow down passwd-guessing programs. 369 */ 370 if (login_attempts) 371 sleep((unsigned) login_attempts); 372 } 373 374 /* 375 * Check if a user is in the file _PATH_FTPUSERS 376 */ 377 checkuser(name) 378 char *name; 379 { 380 FILE *fd; 381 char line[BUFSIZ], *cp; 382 383 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 384 while (fgets(line, sizeof (line), fd) != NULL) { 385 if ((cp = index(line, '\n')) != NULL) 386 *cp = '\0'; 387 if (strcmp(line, name) == 0) 388 return (1); 389 } 390 (void) fclose(fd); 391 } 392 return (0); 393 } 394 395 /* 396 * Terminate login as previous user, if any, resetting state; 397 * used when USER command is given or login fails. 398 */ 399 end_login() 400 { 401 402 (void) seteuid((uid_t)0); 403 if (logged_in) 404 logwtmp(ttyline, "", ""); 405 pw = NULL; 406 logged_in = 0; 407 guest = 0; 408 } 409 410 pass(passwd) 411 char *passwd; 412 { 413 char *xpasswd, *salt; 414 415 if (logged_in || askpasswd == 0) { 416 reply(503, "Login with USER first."); 417 return; 418 } 419 askpasswd = 0; 420 if (!guest) { /* "ftp" is only account allowed no password */ 421 if (pw == NULL) 422 salt = "xx"; 423 else 424 salt = pw->pw_passwd; 425 xpasswd = crypt(passwd, salt); 426 /* The strcmp does not catch null passwords! */ 427 if (pw == NULL || *pw->pw_passwd == '\0' || 428 strcmp(xpasswd, pw->pw_passwd)) { 429 reply(530, "Login incorrect."); 430 pw = NULL; 431 if (login_attempts++ >= 5) { 432 syslog(LOG_NOTICE, 433 "repeated login failures from %s", 434 remotehost); 435 exit(0); 436 } 437 return; 438 } 439 } 440 login_attempts = 0; /* this time successful */ 441 (void) setegid((gid_t)pw->pw_gid); 442 (void) initgroups(pw->pw_name, pw->pw_gid); 443 444 /* open wtmp before chroot */ 445 (void)sprintf(ttyline, "ftp%d", getpid()); 446 logwtmp(ttyline, pw->pw_name, remotehost); 447 logged_in = 1; 448 449 if (guest) { 450 /* 451 * We MUST do a chdir() after the chroot. Otherwise 452 * the old current directory will be accessible as "." 453 * outside the new root! 454 */ 455 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 456 reply(550, "Can't set guest privileges."); 457 goto bad; 458 } 459 } else if (chdir(pw->pw_dir) < 0) { 460 if (chdir("/") < 0) { 461 reply(530, "User %s: can't change directory to %s.", 462 pw->pw_name, pw->pw_dir); 463 goto bad; 464 } else 465 lreply(230, "No directory! Logging in with home=/"); 466 } 467 if (seteuid((uid_t)pw->pw_uid) < 0) { 468 reply(550, "Can't set uid."); 469 goto bad; 470 } 471 if (guest) { 472 reply(230, "Guest login ok, access restrictions apply."); 473 #ifdef SETPROCTITLE 474 sprintf(proctitle, "%s: anonymous/%.*s", remotehost, 475 sizeof(proctitle) - sizeof(remotehost) - 476 sizeof(": anonymous/"), passwd); 477 setproctitle(proctitle); 478 #endif /* SETPROCTITLE */ 479 if (logging) 480 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 481 remotehost, passwd); 482 } else { 483 reply(230, "User %s logged in.", pw->pw_name); 484 #ifdef SETPROCTITLE 485 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 486 setproctitle(proctitle); 487 #endif /* SETPROCTITLE */ 488 if (logging) 489 syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", 490 remotehost, pw->pw_name); 491 } 492 home = pw->pw_dir; /* home dir for globbing */ 493 (void) umask(defumask); 494 return; 495 bad: 496 /* Forget all about it... */ 497 end_login(); 498 } 499 500 retrieve(cmd, name) 501 char *cmd, *name; 502 { 503 FILE *fin, *dout; 504 struct stat st; 505 int (*closefunc)(); 506 507 if (cmd == 0) { 508 fin = fopen(name, "r"), closefunc = fclose; 509 st.st_size = 0; 510 } else { 511 char line[BUFSIZ]; 512 513 (void) sprintf(line, cmd, name), name = line; 514 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 515 st.st_size = -1; 516 st.st_blksize = BUFSIZ; 517 } 518 if (fin == NULL) { 519 if (errno != 0) 520 perror_reply(550, name); 521 return; 522 } 523 if (cmd == 0 && 524 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 525 reply(550, "%s: not a plain file.", name); 526 goto done; 527 } 528 if (restart_point) { 529 if (type == TYPE_A) { 530 register int i, n, c; 531 532 n = restart_point; 533 i = 0; 534 while (i++ < n) { 535 if ((c=getc(fin)) == EOF) { 536 perror_reply(550, name); 537 goto done; 538 } 539 if (c == '\n') 540 i++; 541 } 542 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 543 perror_reply(550, name); 544 goto done; 545 } 546 } 547 dout = dataconn(name, st.st_size, "w"); 548 if (dout == NULL) 549 goto done; 550 send_data(fin, dout, st.st_blksize); 551 (void) fclose(dout); 552 data = -1; 553 pdata = -1; 554 done: 555 (*closefunc)(fin); 556 } 557 558 store(name, mode, unique) 559 char *name, *mode; 560 int unique; 561 { 562 FILE *fout, *din; 563 struct stat st; 564 int (*closefunc)(); 565 char *gunique(); 566 567 if (unique && stat(name, &st) == 0 && 568 (name = gunique(name)) == NULL) 569 return; 570 571 if (restart_point) 572 mode = "r+w"; 573 fout = fopen(name, mode); 574 closefunc = fclose; 575 if (fout == NULL) { 576 perror_reply(553, name); 577 return; 578 } 579 if (restart_point) { 580 if (type == TYPE_A) { 581 register int i, n, c; 582 583 n = restart_point; 584 i = 0; 585 while (i++ < n) { 586 if ((c=getc(fout)) == EOF) { 587 perror_reply(550, name); 588 goto done; 589 } 590 if (c == '\n') 591 i++; 592 } 593 /* 594 * We must do this seek to "current" position 595 * because we are changing from reading to 596 * writing. 597 */ 598 if (fseek(fout, 0L, L_INCR) < 0) { 599 perror_reply(550, name); 600 goto done; 601 } 602 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 603 perror_reply(550, name); 604 goto done; 605 } 606 } 607 din = dataconn(name, (off_t)-1, "r"); 608 if (din == NULL) 609 goto done; 610 if (receive_data(din, fout) == 0) { 611 if (unique) 612 reply(226, "Transfer complete (unique file name:%s).", 613 name); 614 else 615 reply(226, "Transfer complete."); 616 } 617 (void) fclose(din); 618 data = -1; 619 pdata = -1; 620 done: 621 (*closefunc)(fout); 622 } 623 624 FILE * 625 getdatasock(mode) 626 char *mode; 627 { 628 int s, on = 1, tries; 629 630 if (data >= 0) 631 return (fdopen(data, mode)); 632 s = socket(AF_INET, SOCK_STREAM, 0); 633 if (s < 0) 634 return (NULL); 635 (void) seteuid((uid_t)0); 636 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 637 (char *) &on, sizeof (on)) < 0) 638 goto bad; 639 /* anchor socket to avoid multi-homing problems */ 640 data_source.sin_family = AF_INET; 641 data_source.sin_addr = ctrl_addr.sin_addr; 642 for (tries = 1; ; tries++) { 643 if (bind(s, (struct sockaddr *)&data_source, 644 sizeof (data_source)) >= 0) 645 break; 646 if (errno != EADDRINUSE || tries > 10) 647 goto bad; 648 sleep(tries); 649 } 650 (void) seteuid((uid_t)pw->pw_uid); 651 return (fdopen(s, mode)); 652 bad: 653 (void) seteuid((uid_t)pw->pw_uid); 654 (void) close(s); 655 return (NULL); 656 } 657 658 FILE * 659 dataconn(name, size, mode) 660 char *name; 661 off_t size; 662 char *mode; 663 { 664 char sizebuf[32]; 665 FILE *file; 666 int retry = 0; 667 668 file_size = size; 669 byte_count = 0; 670 if (size != (off_t) -1) 671 (void) sprintf (sizebuf, " (%ld bytes)", size); 672 else 673 (void) strcpy(sizebuf, ""); 674 if (pdata >= 0) { 675 struct sockaddr_in from; 676 int s, fromlen = sizeof(from); 677 678 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 679 if (s < 0) { 680 reply(425, "Can't open data connection."); 681 (void) close(pdata); 682 pdata = -1; 683 return(NULL); 684 } 685 (void) close(pdata); 686 pdata = s; 687 reply(150, "Opening %s mode data connection for %s%s.", 688 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 689 return(fdopen(pdata, mode)); 690 } 691 if (data >= 0) { 692 reply(125, "Using existing data connection for %s%s.", 693 name, sizebuf); 694 usedefault = 1; 695 return (fdopen(data, mode)); 696 } 697 if (usedefault) 698 data_dest = his_addr; 699 usedefault = 1; 700 file = getdatasock(mode); 701 if (file == NULL) { 702 reply(425, "Can't create data socket (%s,%d): %s.", 703 inet_ntoa(data_source.sin_addr), 704 ntohs(data_source.sin_port), 705 errno < sys_nerr ? sys_errlist[errno] : "unknown error"); 706 return (NULL); 707 } 708 data = fileno(file); 709 while (connect(data, (struct sockaddr *)&data_dest, 710 sizeof (data_dest)) < 0) { 711 if (errno == EADDRINUSE && retry < swaitmax) { 712 sleep((unsigned) swaitint); 713 retry += swaitint; 714 continue; 715 } 716 perror_reply(425, "Can't build data connection"); 717 (void) fclose(file); 718 data = -1; 719 return (NULL); 720 } 721 reply(150, "Opening %s mode data connection for %s%s.", 722 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 723 return (file); 724 } 725 726 /* 727 * Tranfer the contents of "instr" to 728 * "outstr" peer using the appropriate 729 * encapsulation of the data subject 730 * to Mode, Structure, and Type. 731 * 732 * NB: Form isn't handled. 733 */ 734 send_data(instr, outstr, blksize) 735 FILE *instr, *outstr; 736 off_t blksize; 737 { 738 register int c, cnt; 739 register char *buf; 740 int netfd, filefd; 741 742 transflag++; 743 if (setjmp(urgcatch)) { 744 transflag = 0; 745 return; 746 } 747 switch (type) { 748 749 case TYPE_A: 750 while ((c = getc(instr)) != EOF) { 751 byte_count++; 752 if (c == '\n') { 753 if (ferror(outstr)) 754 goto data_err; 755 (void) putc('\r', outstr); 756 } 757 (void) putc(c, outstr); 758 } 759 fflush(outstr); 760 transflag = 0; 761 if (ferror(instr)) 762 goto file_err; 763 if (ferror(outstr)) 764 goto data_err; 765 reply(226, "Transfer complete."); 766 return; 767 768 case TYPE_I: 769 case TYPE_L: 770 if ((buf = malloc((u_int)blksize)) == NULL) { 771 transflag = 0; 772 perror_reply(451, "Local resource failure: malloc"); 773 return; 774 } 775 netfd = fileno(outstr); 776 filefd = fileno(instr); 777 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 778 write(netfd, buf, cnt) == cnt) 779 byte_count += cnt; 780 transflag = 0; 781 (void)free(buf); 782 if (cnt != 0) { 783 if (cnt < 0) 784 goto file_err; 785 goto data_err; 786 } 787 reply(226, "Transfer complete."); 788 return; 789 default: 790 transflag = 0; 791 reply(550, "Unimplemented TYPE %d in send_data", type); 792 return; 793 } 794 795 data_err: 796 transflag = 0; 797 perror_reply(426, "Data connection"); 798 return; 799 800 file_err: 801 transflag = 0; 802 perror_reply(551, "Error on input file"); 803 } 804 805 /* 806 * Transfer data from peer to 807 * "outstr" using the appropriate 808 * encapulation of the data subject 809 * to Mode, Structure, and Type. 810 * 811 * N.B.: Form isn't handled. 812 */ 813 receive_data(instr, outstr) 814 FILE *instr, *outstr; 815 { 816 register int c; 817 int cnt, bare_lfs = 0; 818 char buf[BUFSIZ]; 819 820 transflag++; 821 if (setjmp(urgcatch)) { 822 transflag = 0; 823 return (-1); 824 } 825 switch (type) { 826 827 case TYPE_I: 828 case TYPE_L: 829 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 830 if (write(fileno(outstr), buf, cnt) != cnt) 831 goto file_err; 832 byte_count += cnt; 833 } 834 if (cnt < 0) 835 goto data_err; 836 transflag = 0; 837 return (0); 838 839 case TYPE_E: 840 reply(553, "TYPE E not implemented."); 841 transflag = 0; 842 return (-1); 843 844 case TYPE_A: 845 while ((c = getc(instr)) != EOF) { 846 byte_count++; 847 if (c == '\n') 848 bare_lfs++; 849 while (c == '\r') { 850 if (ferror(outstr)) 851 goto data_err; 852 if ((c = getc(instr)) != '\n') { 853 (void) putc ('\r', outstr); 854 if (c == '\0' || c == EOF) 855 goto contin2; 856 } 857 } 858 (void) putc(c, outstr); 859 contin2: ; 860 } 861 fflush(outstr); 862 if (ferror(instr)) 863 goto data_err; 864 if (ferror(outstr)) 865 goto file_err; 866 transflag = 0; 867 if (bare_lfs) { 868 lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 869 printf(" File may not have transferred correctly.\r\n"); 870 } 871 return (0); 872 default: 873 reply(550, "Unimplemented TYPE %d in receive_data", type); 874 transflag = 0; 875 return (-1); 876 } 877 878 data_err: 879 transflag = 0; 880 perror_reply(426, "Data Connection"); 881 return (-1); 882 883 file_err: 884 transflag = 0; 885 perror_reply(452, "Error writing file"); 886 return (-1); 887 } 888 889 statfilecmd(filename) 890 char *filename; 891 { 892 char line[BUFSIZ]; 893 FILE *fin; 894 int c; 895 896 (void) sprintf(line, "/bin/ls -lgA %s", filename); 897 fin = ftpd_popen(line, "r"); 898 lreply(211, "status of %s:", filename); 899 while ((c = getc(fin)) != EOF) { 900 if (c == '\n') { 901 if (ferror(stdout)){ 902 perror_reply(421, "control connection"); 903 (void) ftpd_pclose(fin); 904 dologout(1); 905 /* NOTREACHED */ 906 } 907 if (ferror(fin)) { 908 perror_reply(551, filename); 909 (void) ftpd_pclose(fin); 910 return; 911 } 912 (void) putc('\r', stdout); 913 } 914 (void) putc(c, stdout); 915 } 916 (void) ftpd_pclose(fin); 917 reply(211, "End of Status"); 918 } 919 920 statcmd() 921 { 922 struct sockaddr_in *sin; 923 u_char *a, *p; 924 925 lreply(211, "%s FTP server status:", hostname, version); 926 printf(" %s\r\n", version); 927 printf(" Connected to %s", remotehost); 928 if (!isdigit(remotehost[0])) 929 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 930 printf("\r\n"); 931 if (logged_in) { 932 if (guest) 933 printf(" Logged in anonymously\r\n"); 934 else 935 printf(" Logged in as %s\r\n", pw->pw_name); 936 } else if (askpasswd) 937 printf(" Waiting for password\r\n"); 938 else 939 printf(" Waiting for user name\r\n"); 940 printf(" TYPE: %s", typenames[type]); 941 if (type == TYPE_A || type == TYPE_E) 942 printf(", FORM: %s", formnames[form]); 943 if (type == TYPE_L) 944 #if NBBY == 8 945 printf(" %d", NBBY); 946 #else 947 printf(" %d", bytesize); /* need definition! */ 948 #endif 949 printf("; STRUcture: %s; transfer MODE: %s\r\n", 950 strunames[stru], modenames[mode]); 951 if (data != -1) 952 printf(" Data connection open\r\n"); 953 else if (pdata != -1) { 954 printf(" in Passive mode"); 955 sin = &pasv_addr; 956 goto printaddr; 957 } else if (usedefault == 0) { 958 printf(" PORT"); 959 sin = &data_dest; 960 printaddr: 961 a = (u_char *) &sin->sin_addr; 962 p = (u_char *) &sin->sin_port; 963 #define UC(b) (((int) b) & 0xff) 964 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 965 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 966 #undef UC 967 } else 968 printf(" No data connection\r\n"); 969 reply(211, "End of status"); 970 } 971 972 fatal(s) 973 char *s; 974 { 975 reply(451, "Error in server: %s\n", s); 976 reply(221, "Closing connection due to server error."); 977 dologout(0); 978 /* NOTREACHED */ 979 } 980 981 /* VARARGS2 */ 982 reply(n, fmt, p0, p1, p2, p3, p4, p5) 983 int n; 984 char *fmt; 985 { 986 printf("%d ", n); 987 printf(fmt, p0, p1, p2, p3, p4, p5); 988 printf("\r\n"); 989 (void)fflush(stdout); 990 if (debug) { 991 syslog(LOG_DEBUG, "<--- %d ", n); 992 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 993 } 994 } 995 996 /* VARARGS2 */ 997 lreply(n, fmt, p0, p1, p2, p3, p4, p5) 998 int n; 999 char *fmt; 1000 { 1001 printf("%d- ", n); 1002 printf(fmt, p0, p1, p2, p3, p4, p5); 1003 printf("\r\n"); 1004 (void)fflush(stdout); 1005 if (debug) { 1006 syslog(LOG_DEBUG, "<--- %d- ", n); 1007 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 1008 } 1009 } 1010 1011 ack(s) 1012 char *s; 1013 { 1014 reply(250, "%s command successful.", s); 1015 } 1016 1017 nack(s) 1018 char *s; 1019 { 1020 reply(502, "%s command not implemented.", s); 1021 } 1022 1023 /* ARGSUSED */ 1024 yyerror(s) 1025 char *s; 1026 { 1027 char *cp; 1028 1029 if (cp = index(cbuf,'\n')) 1030 *cp = '\0'; 1031 reply(500, "'%s': command not understood.", cbuf); 1032 } 1033 1034 delete(name) 1035 char *name; 1036 { 1037 struct stat st; 1038 1039 if (stat(name, &st) < 0) { 1040 perror_reply(550, name); 1041 return; 1042 } 1043 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1044 if (rmdir(name) < 0) { 1045 perror_reply(550, name); 1046 return; 1047 } 1048 goto done; 1049 } 1050 if (unlink(name) < 0) { 1051 perror_reply(550, name); 1052 return; 1053 } 1054 done: 1055 ack("DELE"); 1056 } 1057 1058 cwd(path) 1059 char *path; 1060 { 1061 if (chdir(path) < 0) 1062 perror_reply(550, path); 1063 else 1064 ack("CWD"); 1065 } 1066 1067 makedir(name) 1068 char *name; 1069 { 1070 if (mkdir(name, 0777) < 0) 1071 perror_reply(550, name); 1072 else 1073 reply(257, "MKD command successful."); 1074 } 1075 1076 removedir(name) 1077 char *name; 1078 { 1079 if (rmdir(name) < 0) 1080 perror_reply(550, name); 1081 else 1082 ack("RMD"); 1083 } 1084 1085 pwd() 1086 { 1087 char path[MAXPATHLEN + 1]; 1088 extern char *getwd(); 1089 1090 if (getwd(path) == (char *)NULL) 1091 reply(550, "%s.", path); 1092 else 1093 reply(257, "\"%s\" is current directory.", path); 1094 } 1095 1096 char * 1097 renamefrom(name) 1098 char *name; 1099 { 1100 struct stat st; 1101 1102 if (stat(name, &st) < 0) { 1103 perror_reply(550, name); 1104 return ((char *)0); 1105 } 1106 reply(350, "File exists, ready for destination name"); 1107 return (name); 1108 } 1109 1110 renamecmd(from, to) 1111 char *from, *to; 1112 { 1113 if (rename(from, to) < 0) 1114 perror_reply(550, "rename"); 1115 else 1116 ack("RNTO"); 1117 } 1118 1119 dolog(sin) 1120 struct sockaddr_in *sin; 1121 { 1122 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1123 sizeof (struct in_addr), AF_INET); 1124 time_t t, time(); 1125 extern char *ctime(); 1126 1127 if (hp) 1128 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 1129 else 1130 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1131 sizeof (remotehost)); 1132 #ifdef SETPROCTITLE 1133 sprintf(proctitle, "%s: connected", remotehost); 1134 setproctitle(proctitle); 1135 #endif /* SETPROCTITLE */ 1136 1137 if (logging) { 1138 t = time((time_t *) 0); 1139 syslog(LOG_INFO, "connection from %s at %s", 1140 remotehost, ctime(&t)); 1141 } 1142 } 1143 1144 /* 1145 * Record logout in wtmp file 1146 * and exit with supplied status. 1147 */ 1148 dologout(status) 1149 int status; 1150 { 1151 if (logged_in) { 1152 (void) seteuid((uid_t)0); 1153 logwtmp(ttyline, "", ""); 1154 } 1155 /* beware of flushing buffers after a SIGPIPE */ 1156 _exit(status); 1157 } 1158 1159 myoob() 1160 { 1161 char *cp; 1162 1163 /* only process if transfer occurring */ 1164 if (!transflag) 1165 return; 1166 cp = tmpline; 1167 if (getline(cp, 7, stdin) == NULL) { 1168 reply(221, "You could at least say goodbye."); 1169 dologout(0); 1170 } 1171 upper(cp); 1172 if (strcmp(cp, "ABOR\r\n") == 0) { 1173 tmpline[0] = '\0'; 1174 reply(426, "Transfer aborted. Data connection closed."); 1175 reply(226, "Abort successful"); 1176 longjmp(urgcatch, 1); 1177 } 1178 if (strcmp(cp, "STAT\r\n") == 0) { 1179 if (file_size != (off_t) -1) 1180 reply(213, "Status: %lu of %lu bytes transferred", 1181 byte_count, file_size); 1182 else 1183 reply(213, "Status: %lu bytes transferred", byte_count); 1184 } 1185 } 1186 1187 /* 1188 * Note: a response of 425 is not mentioned as a possible response to 1189 * the PASV command in RFC959. However, it has been blessed as 1190 * a legitimate response by Jon Postel in a telephone conversation 1191 * with Rick Adams on 25 Jan 89. 1192 */ 1193 passive() 1194 { 1195 int len; 1196 register char *p, *a; 1197 1198 pdata = socket(AF_INET, SOCK_STREAM, 0); 1199 if (pdata < 0) { 1200 perror_reply(425, "Can't open passive connection"); 1201 return; 1202 } 1203 pasv_addr = ctrl_addr; 1204 pasv_addr.sin_port = 0; 1205 (void) seteuid((uid_t)0); 1206 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1207 (void) seteuid((uid_t)pw->pw_uid); 1208 goto pasv_error; 1209 } 1210 (void) seteuid((uid_t)pw->pw_uid); 1211 len = sizeof(pasv_addr); 1212 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1213 goto pasv_error; 1214 if (listen(pdata, 1) < 0) 1215 goto pasv_error; 1216 a = (char *) &pasv_addr.sin_addr; 1217 p = (char *) &pasv_addr.sin_port; 1218 1219 #define UC(b) (((int) b) & 0xff) 1220 1221 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1222 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1223 return; 1224 1225 pasv_error: 1226 (void) close(pdata); 1227 pdata = -1; 1228 perror_reply(425, "Can't open passive connection"); 1229 return; 1230 } 1231 1232 /* 1233 * Generate unique name for file with basename "local". 1234 * The file named "local" is already known to exist. 1235 * Generates failure reply on error. 1236 */ 1237 char * 1238 gunique(local) 1239 char *local; 1240 { 1241 static char new[MAXPATHLEN]; 1242 struct stat st; 1243 char *cp = rindex(local, '/'); 1244 int count = 0; 1245 1246 if (cp) 1247 *cp = '\0'; 1248 if (stat(cp ? local : ".", &st) < 0) { 1249 perror_reply(553, cp ? local : "."); 1250 return((char *) 0); 1251 } 1252 if (cp) 1253 *cp = '/'; 1254 (void) strcpy(new, local); 1255 cp = new + strlen(new); 1256 *cp++ = '.'; 1257 for (count = 1; count < 100; count++) { 1258 (void) sprintf(cp, "%d", count); 1259 if (stat(new, &st) < 0) 1260 return(new); 1261 } 1262 reply(452, "Unique file name cannot be created."); 1263 return((char *) 0); 1264 } 1265 1266 /* 1267 * Format and send reply containing system error number. 1268 */ 1269 perror_reply(code, string) 1270 int code; 1271 char *string; 1272 { 1273 if (errno < sys_nerr) 1274 reply(code, "%s: %s.", string, sys_errlist[errno]); 1275 else 1276 reply(code, "%s: unknown error %d.", string, errno); 1277 } 1278 1279 static char *onefile[] = { 1280 "", 1281 0 1282 }; 1283 1284 send_file_list(whichfiles) 1285 char *whichfiles; 1286 { 1287 struct stat st; 1288 DIR *dirp = NULL; 1289 struct direct *dir; 1290 FILE *dout = NULL; 1291 register char **dirlist, *dirname; 1292 int simple = 0; 1293 char *strpbrk(); 1294 1295 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1296 extern char **glob(), *globerr; 1297 1298 globerr = NULL; 1299 dirlist = glob(whichfiles); 1300 if (globerr != NULL) { 1301 reply(550, globerr); 1302 return; 1303 } else if (dirlist == NULL) { 1304 errno = ENOENT; 1305 perror_reply(550, whichfiles); 1306 return; 1307 } 1308 } else { 1309 onefile[0] = whichfiles; 1310 dirlist = onefile; 1311 simple = 1; 1312 } 1313 1314 if (setjmp(urgcatch)) { 1315 transflag = 0; 1316 return; 1317 } 1318 while (dirname = *dirlist++) { 1319 if (stat(dirname, &st) < 0) { 1320 /* 1321 * If user typed "ls -l", etc, and the client 1322 * used NLST, do what the user meant. 1323 */ 1324 if (dirname[0] == '-' && *dirlist == NULL && 1325 transflag == 0) { 1326 retrieve("/bin/ls %s", dirname); 1327 return; 1328 } 1329 perror_reply(550, whichfiles); 1330 if (dout != NULL) { 1331 (void) fclose(dout); 1332 transflag = 0; 1333 data = -1; 1334 pdata = -1; 1335 } 1336 return; 1337 } 1338 1339 if ((st.st_mode&S_IFMT) == S_IFREG) { 1340 if (dout == NULL) { 1341 dout = dataconn("file list", (off_t)-1, "w"); 1342 if (dout == NULL) 1343 return; 1344 transflag++; 1345 } 1346 fprintf(dout, "%s%s\n", dirname, 1347 type == TYPE_A ? "\r" : ""); 1348 byte_count += strlen(dirname) + 1; 1349 continue; 1350 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1351 continue; 1352 1353 if ((dirp = opendir(dirname)) == NULL) 1354 continue; 1355 1356 while ((dir = readdir(dirp)) != NULL) { 1357 char nbuf[MAXPATHLEN]; 1358 1359 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1360 continue; 1361 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1362 dir->d_namlen == 2) 1363 continue; 1364 1365 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1366 1367 /* 1368 * We have to do a stat to insure it's 1369 * not a directory or special file. 1370 */ 1371 if (simple || (stat(nbuf, &st) == 0 && 1372 (st.st_mode&S_IFMT) == S_IFREG)) { 1373 if (dout == NULL) { 1374 dout = dataconn("file list", (off_t)-1, 1375 "w"); 1376 if (dout == NULL) 1377 return; 1378 transflag++; 1379 } 1380 if (nbuf[0] == '.' && nbuf[1] == '/') 1381 fprintf(dout, "%s%s\n", &nbuf[2], 1382 type == TYPE_A ? "\r" : ""); 1383 else 1384 fprintf(dout, "%s%s\n", nbuf, 1385 type == TYPE_A ? "\r" : ""); 1386 byte_count += strlen(nbuf) + 1; 1387 } 1388 } 1389 (void) closedir(dirp); 1390 } 1391 1392 if (dout == NULL) 1393 reply(550, "No files found."); 1394 else if (ferror(dout) != 0) 1395 perror_reply(550, "Data connection"); 1396 else 1397 reply(226, "Transfer complete."); 1398 1399 transflag = 0; 1400 if (dout != NULL) 1401 (void) fclose(dout); 1402 data = -1; 1403 pdata = -1; 1404 } 1405 1406 #ifdef SETPROCTITLE 1407 /* 1408 * clobber argv so ps will show what we're doing. 1409 * (stolen from sendmail) 1410 * warning, since this is usually started from inetd.conf, it 1411 * often doesn't have much of an environment or arglist to overwrite. 1412 */ 1413 1414 /*VARARGS1*/ 1415 setproctitle(fmt, a, b, c) 1416 char *fmt; 1417 { 1418 register char *p, *bp, ch; 1419 register int i; 1420 char buf[BUFSIZ]; 1421 1422 (void) sprintf(buf, fmt, a, b, c); 1423 1424 /* make ps print our process name */ 1425 p = Argv[0]; 1426 *p++ = '-'; 1427 1428 i = strlen(buf); 1429 if (i > LastArgv - p - 2) { 1430 i = LastArgv - p - 2; 1431 buf[i] = '\0'; 1432 } 1433 bp = buf; 1434 while (ch = *bp++) 1435 if (ch != '\n' && ch != '\r') 1436 *p++ = ch; 1437 while (p < LastArgv) 1438 *p++ = ' '; 1439 } 1440 #endif /* SETPROCTITLE */ 1441