1 /* 2 * Copyright (c) 1985, 1988, 1990 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1985, 1988, 1990 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)ftpd.c 5.41 (Berkeley) 03/18/92"; 16 #endif /* not lint */ 17 18 /* 19 * FTP server. 20 */ 21 #include <sys/param.h> 22 #include <sys/stat.h> 23 #include <sys/ioctl.h> 24 #include <sys/socket.h> 25 #include <sys/wait.h> 26 27 #include <netinet/in.h> 28 #include <netinet/in_systm.h> 29 #include <netinet/ip.h> 30 31 #define FTP_NAMES 32 #include <arpa/ftp.h> 33 #include <arpa/inet.h> 34 #include <arpa/telnet.h> 35 36 #include <signal.h> 37 #include <dirent.h> 38 #include <fcntl.h> 39 #include <time.h> 40 #include <pwd.h> 41 #include <setjmp.h> 42 #include <netdb.h> 43 #include <errno.h> 44 #include <syslog.h> 45 #include <varargs.h> 46 #include <unistd.h> 47 #include <stdio.h> 48 #include <ctype.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include "pathnames.h" 52 53 /* 54 * File containing login names 55 * NOT to be used on this machine. 56 * Commonly used to disallow uucp. 57 */ 58 extern int errno; 59 extern char *crypt(); 60 extern char version[]; 61 extern char *home; /* pointer to home directory for glob */ 62 extern FILE *ftpd_popen(), *fopen(), *freopen(); 63 extern int ftpd_pclose(), fclose(); 64 extern char *getline(); 65 extern char cbuf[]; 66 extern off_t restart_point; 67 68 struct sockaddr_in ctrl_addr; 69 struct sockaddr_in data_source; 70 struct sockaddr_in data_dest; 71 struct sockaddr_in his_addr; 72 struct sockaddr_in pasv_addr; 73 74 int data; 75 jmp_buf errcatch, urgcatch; 76 int logged_in; 77 struct passwd *pw; 78 int debug; 79 int timeout = 900; /* timeout after 15 minutes of inactivity */ 80 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 81 int logging; 82 int guest; 83 int type; 84 int form; 85 int stru; /* avoid C keyword */ 86 int mode; 87 int usedefault = 1; /* for data transfers */ 88 int pdata = -1; /* for passive mode */ 89 int transflag; 90 off_t file_size; 91 off_t byte_count; 92 #if !defined(CMASK) || CMASK == 0 93 #undef CMASK 94 #define CMASK 027 95 #endif 96 int defumask = CMASK; /* default umask value */ 97 char tmpline[7]; 98 char hostname[MAXHOSTNAMELEN]; 99 char remotehost[MAXHOSTNAMELEN]; 100 101 /* 102 * Timeout intervals for retrying connections 103 * to hosts that don't accept PORT cmds. This 104 * is a kludge, but given the problems with TCP... 105 */ 106 #define SWAITMAX 90 /* wait at most 90 seconds */ 107 #define SWAITINT 5 /* interval between retries */ 108 109 int swaitmax = SWAITMAX; 110 int swaitint = SWAITINT; 111 112 void lostconn(), myoob(); 113 FILE *getdatasock(), *dataconn(); 114 115 #ifdef SETPROCTITLE 116 char **Argv = NULL; /* pointer to argument vector */ 117 char *LastArgv = NULL; /* end of argv */ 118 char proctitle[BUFSIZ]; /* initial part of title */ 119 #endif /* SETPROCTITLE */ 120 121 main(argc, argv, envp) 122 int argc; 123 char *argv[]; 124 char **envp; 125 { 126 int addrlen, on = 1, tos; 127 char *cp; 128 129 /* 130 * LOG_NDELAY sets up the logging connection immediately, 131 * necessary for anonymous ftp's that chroot and can't do it later. 132 */ 133 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_DAEMON); 134 addrlen = sizeof (his_addr); 135 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 136 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 137 exit(1); 138 } 139 addrlen = sizeof (ctrl_addr); 140 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 141 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 142 exit(1); 143 } 144 #ifdef IP_TOS 145 tos = IPTOS_LOWDELAY; 146 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 147 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 148 #endif 149 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 150 debug = 0; 151 #ifdef SETPROCTITLE 152 /* 153 * Save start and extent of argv for setproctitle. 154 */ 155 Argv = argv; 156 while (*envp) 157 envp++; 158 LastArgv = envp[-1] + strlen(envp[-1]); 159 #endif /* SETPROCTITLE */ 160 161 argc--, argv++; 162 while (argc > 0 && *argv[0] == '-') { 163 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 164 165 case 'v': 166 debug = 1; 167 break; 168 169 case 'd': 170 debug = 1; 171 break; 172 173 case 'l': 174 logging = 1; 175 break; 176 177 case 't': 178 timeout = atoi(++cp); 179 if (maxtimeout < timeout) 180 maxtimeout = timeout; 181 goto nextopt; 182 183 case 'T': 184 maxtimeout = atoi(++cp); 185 if (timeout > maxtimeout) 186 timeout = maxtimeout; 187 goto nextopt; 188 189 case 'u': 190 { 191 int val = 0; 192 193 while (*++cp && *cp >= '0' && *cp <= '9') 194 val = val*8 + *cp - '0'; 195 if (*cp) 196 fprintf(stderr, "ftpd: Bad value for -u\n"); 197 else 198 defumask = val; 199 goto nextopt; 200 } 201 202 default: 203 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 204 *cp); 205 break; 206 } 207 nextopt: 208 argc--, argv++; 209 } 210 (void) freopen(_PATH_DEVNULL, "w", stderr); 211 (void) signal(SIGPIPE, lostconn); 212 (void) signal(SIGCHLD, SIG_IGN); 213 if ((int)signal(SIGURG, myoob) < 0) 214 syslog(LOG_ERR, "signal: %m"); 215 216 /* Try to handle urgent data inline */ 217 #ifdef SO_OOBINLINE 218 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 219 syslog(LOG_ERR, "setsockopt: %m"); 220 #endif 221 222 #ifdef F_SETOWN 223 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 224 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 225 #endif 226 dolog(&his_addr); 227 /* 228 * Set up default state 229 */ 230 data = -1; 231 type = TYPE_A; 232 form = FORM_N; 233 stru = STRU_F; 234 mode = MODE_S; 235 tmpline[0] = '\0'; 236 (void) gethostname(hostname, sizeof (hostname)); 237 reply(220, "%s FTP server (%s) ready.", hostname, version); 238 (void) setjmp(errcatch); 239 for (;;) 240 (void) yyparse(); 241 /* NOTREACHED */ 242 } 243 244 void 245 lostconn() 246 { 247 if (debug) 248 syslog(LOG_DEBUG, "lost connection"); 249 dologout(-1); 250 } 251 252 static char ttyline[20]; 253 254 /* 255 * Helper function for sgetpwnam(). 256 */ 257 char * 258 sgetsave(s) 259 char *s; 260 { 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 and is acceptable; 309 * sets askpasswd if a PASS command is expected. If logged in previously, 310 * need to reset state. If name is "ftp" or "anonymous", the name is not in 311 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 312 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 313 * requesting login privileges. Disallow anyone who does not have a standard 314 * shell as returned by getusershell(). Disallow anyone mentioned in the file 315 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 316 */ 317 user(name) 318 char *name; 319 { 320 register char *cp; 321 char *shell; 322 char *getusershell(); 323 324 if (logged_in) { 325 if (guest) { 326 reply(530, "Can't change user from guest login."); 327 return; 328 } 329 end_login(); 330 } 331 332 guest = 0; 333 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 334 if (checkuser("ftp") || checkuser("anonymous")) 335 reply(530, "User %s access denied.", name); 336 else if ((pw = sgetpwnam("ftp")) != NULL) { 337 guest = 1; 338 askpasswd = 1; 339 reply(331, "Guest login ok, send ident as password."); 340 } else 341 reply(530, "User %s unknown.", name); 342 return; 343 } 344 if (pw = sgetpwnam(name)) { 345 if ((shell = pw->pw_shell) == NULL || *shell == 0) 346 shell = _PATH_BSHELL; 347 while ((cp = getusershell()) != NULL) 348 if (strcmp(cp, shell) == 0) 349 break; 350 endusershell(); 351 if (cp == NULL || checkuser(name)) { 352 reply(530, "User %s access denied.", name); 353 if (logging) 354 syslog(LOG_NOTICE, 355 "FTP LOGIN REFUSED FROM %s, %s", 356 remotehost, name); 357 pw = (struct passwd *) NULL; 358 return; 359 } 360 } 361 reply(331, "Password required for %s.", name); 362 askpasswd = 1; 363 /* 364 * Delay before reading passwd after first failed 365 * attempt to slow down passwd-guessing programs. 366 */ 367 if (login_attempts) 368 sleep((unsigned) login_attempts); 369 } 370 371 /* 372 * Check if a user is in the file _PATH_FTPUSERS 373 */ 374 checkuser(name) 375 char *name; 376 { 377 register FILE *fd; 378 register char *p; 379 char line[BUFSIZ]; 380 381 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 382 while (fgets(line, sizeof(line), fd) != NULL) 383 if ((p = index(line, '\n')) != NULL) { 384 *p = '\0'; 385 if (line[0] == '#') 386 continue; 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 home = "/"; /* guest home dir for globbing */ 483 } else { 484 reply(230, "User %s logged in.", pw->pw_name); 485 #ifdef SETPROCTITLE 486 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); 487 setproctitle(proctitle); 488 #endif /* SETPROCTITLE */ 489 if (logging) 490 syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", 491 remotehost, pw->pw_name); 492 home = pw->pw_dir; /* home dir for globbing */ 493 } 494 (void) umask(defumask); 495 return; 496 bad: 497 /* Forget all about it... */ 498 end_login(); 499 } 500 501 retrieve(cmd, name) 502 char *cmd, *name; 503 { 504 FILE *fin, *dout; 505 struct stat st; 506 int (*closefunc)(); 507 508 if (cmd == 0) { 509 fin = fopen(name, "r"), closefunc = fclose; 510 st.st_size = 0; 511 } else { 512 char line[BUFSIZ]; 513 514 (void) sprintf(line, cmd, name), name = line; 515 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 516 st.st_size = -1; 517 st.st_blksize = BUFSIZ; 518 } 519 if (fin == NULL) { 520 if (errno != 0) 521 perror_reply(550, name); 522 return; 523 } 524 if (cmd == 0 && 525 (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 526 reply(550, "%s: not a plain file.", name); 527 goto done; 528 } 529 if (restart_point) { 530 if (type == TYPE_A) { 531 register int i, n, c; 532 533 n = restart_point; 534 i = 0; 535 while (i++ < n) { 536 if ((c=getc(fin)) == EOF) { 537 perror_reply(550, name); 538 goto done; 539 } 540 if (c == '\n') 541 i++; 542 } 543 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 544 perror_reply(550, name); 545 goto done; 546 } 547 } 548 dout = dataconn(name, st.st_size, "w"); 549 if (dout == NULL) 550 goto done; 551 send_data(fin, dout, st.st_blksize); 552 (void) fclose(dout); 553 data = -1; 554 pdata = -1; 555 done: 556 (*closefunc)(fin); 557 } 558 559 store(name, mode, unique) 560 char *name, *mode; 561 int unique; 562 { 563 FILE *fout, *din; 564 struct stat st; 565 int (*closefunc)(); 566 char *gunique(); 567 568 if (unique && stat(name, &st) == 0 && 569 (name = gunique(name)) == NULL) 570 return; 571 572 if (restart_point) 573 mode = "r+w"; 574 fout = fopen(name, mode); 575 closefunc = fclose; 576 if (fout == NULL) { 577 perror_reply(553, name); 578 return; 579 } 580 if (restart_point) { 581 if (type == TYPE_A) { 582 register int i, n, c; 583 584 n = restart_point; 585 i = 0; 586 while (i++ < n) { 587 if ((c=getc(fout)) == EOF) { 588 perror_reply(550, name); 589 goto done; 590 } 591 if (c == '\n') 592 i++; 593 } 594 /* 595 * We must do this seek to "current" position 596 * because we are changing from reading to 597 * writing. 598 */ 599 if (fseek(fout, 0L, L_INCR) < 0) { 600 perror_reply(550, name); 601 goto done; 602 } 603 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 604 perror_reply(550, name); 605 goto done; 606 } 607 } 608 din = dataconn(name, (off_t)-1, "r"); 609 if (din == NULL) 610 goto done; 611 if (receive_data(din, fout) == 0) { 612 if (unique) 613 reply(226, "Transfer complete (unique file name:%s).", 614 name); 615 else 616 reply(226, "Transfer complete."); 617 } 618 (void) fclose(din); 619 data = -1; 620 pdata = -1; 621 done: 622 (*closefunc)(fout); 623 } 624 625 FILE * 626 getdatasock(mode) 627 char *mode; 628 { 629 int s, on = 1, tries; 630 631 if (data >= 0) 632 return (fdopen(data, mode)); 633 (void) seteuid((uid_t)0); 634 s = socket(AF_INET, SOCK_STREAM, 0); 635 if (s < 0) 636 goto bad; 637 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 638 (char *) &on, sizeof (on)) < 0) 639 goto bad; 640 /* anchor socket to avoid multi-homing problems */ 641 data_source.sin_family = AF_INET; 642 data_source.sin_addr = ctrl_addr.sin_addr; 643 for (tries = 1; ; tries++) { 644 if (bind(s, (struct sockaddr *)&data_source, 645 sizeof (data_source)) >= 0) 646 break; 647 if (errno != EADDRINUSE || tries > 10) 648 goto bad; 649 sleep(tries); 650 } 651 (void) seteuid((uid_t)pw->pw_uid); 652 #ifdef IP_TOS 653 on = IPTOS_THROUGHPUT; 654 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 655 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 656 #endif 657 return (fdopen(s, mode)); 658 bad: 659 (void) seteuid((uid_t)pw->pw_uid); 660 (void) close(s); 661 return (NULL); 662 } 663 664 FILE * 665 dataconn(name, size, mode) 666 char *name; 667 off_t size; 668 char *mode; 669 { 670 char sizebuf[32]; 671 FILE *file; 672 int retry = 0, tos; 673 674 file_size = size; 675 byte_count = 0; 676 if (size != (off_t) -1) 677 (void) sprintf (sizebuf, " (%ld bytes)", size); 678 else 679 (void) strcpy(sizebuf, ""); 680 if (pdata >= 0) { 681 struct sockaddr_in from; 682 int s, fromlen = sizeof(from); 683 684 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 685 if (s < 0) { 686 reply(425, "Can't open data connection."); 687 (void) close(pdata); 688 pdata = -1; 689 return(NULL); 690 } 691 (void) close(pdata); 692 pdata = s; 693 #ifdef IP_TOS 694 tos = IPTOS_LOWDELAY; 695 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 696 sizeof(int)); 697 #endif 698 reply(150, "Opening %s mode data connection for %s%s.", 699 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 700 return(fdopen(pdata, mode)); 701 } 702 if (data >= 0) { 703 reply(125, "Using existing data connection for %s%s.", 704 name, sizebuf); 705 usedefault = 1; 706 return (fdopen(data, mode)); 707 } 708 if (usedefault) 709 data_dest = his_addr; 710 usedefault = 1; 711 file = getdatasock(mode); 712 if (file == NULL) { 713 reply(425, "Can't create data socket (%s,%d): %s.", 714 inet_ntoa(data_source.sin_addr), 715 ntohs(data_source.sin_port), strerror(errno)); 716 return (NULL); 717 } 718 data = fileno(file); 719 while (connect(data, (struct sockaddr *)&data_dest, 720 sizeof (data_dest)) < 0) { 721 if (errno == EADDRINUSE && retry < swaitmax) { 722 sleep((unsigned) swaitint); 723 retry += swaitint; 724 continue; 725 } 726 perror_reply(425, "Can't build data connection"); 727 (void) fclose(file); 728 data = -1; 729 return (NULL); 730 } 731 reply(150, "Opening %s mode data connection for %s%s.", 732 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 733 return (file); 734 } 735 736 /* 737 * Tranfer the contents of "instr" to 738 * "outstr" peer using the appropriate 739 * encapsulation of the data subject 740 * to Mode, Structure, and Type. 741 * 742 * NB: Form isn't handled. 743 */ 744 send_data(instr, outstr, blksize) 745 FILE *instr, *outstr; 746 off_t blksize; 747 { 748 register int c, cnt; 749 register char *buf; 750 int netfd, filefd; 751 752 transflag++; 753 if (setjmp(urgcatch)) { 754 transflag = 0; 755 return; 756 } 757 switch (type) { 758 759 case TYPE_A: 760 while ((c = getc(instr)) != EOF) { 761 byte_count++; 762 if (c == '\n') { 763 if (ferror(outstr)) 764 goto data_err; 765 (void) putc('\r', outstr); 766 } 767 (void) putc(c, outstr); 768 } 769 fflush(outstr); 770 transflag = 0; 771 if (ferror(instr)) 772 goto file_err; 773 if (ferror(outstr)) 774 goto data_err; 775 reply(226, "Transfer complete."); 776 return; 777 778 case TYPE_I: 779 case TYPE_L: 780 if ((buf = malloc((u_int)blksize)) == NULL) { 781 transflag = 0; 782 perror_reply(451, "Local resource failure: malloc"); 783 return; 784 } 785 netfd = fileno(outstr); 786 filefd = fileno(instr); 787 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 788 write(netfd, buf, cnt) == cnt) 789 byte_count += cnt; 790 transflag = 0; 791 (void)free(buf); 792 if (cnt != 0) { 793 if (cnt < 0) 794 goto file_err; 795 goto data_err; 796 } 797 reply(226, "Transfer complete."); 798 return; 799 default: 800 transflag = 0; 801 reply(550, "Unimplemented TYPE %d in send_data", type); 802 return; 803 } 804 805 data_err: 806 transflag = 0; 807 perror_reply(426, "Data connection"); 808 return; 809 810 file_err: 811 transflag = 0; 812 perror_reply(551, "Error on input file"); 813 } 814 815 /* 816 * Transfer data from peer to 817 * "outstr" using the appropriate 818 * encapulation of the data subject 819 * to Mode, Structure, and Type. 820 * 821 * N.B.: Form isn't handled. 822 */ 823 receive_data(instr, outstr) 824 FILE *instr, *outstr; 825 { 826 register int c; 827 int cnt, bare_lfs = 0; 828 char buf[BUFSIZ]; 829 830 transflag++; 831 if (setjmp(urgcatch)) { 832 transflag = 0; 833 return (-1); 834 } 835 switch (type) { 836 837 case TYPE_I: 838 case TYPE_L: 839 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 840 if (write(fileno(outstr), buf, cnt) != cnt) 841 goto file_err; 842 byte_count += cnt; 843 } 844 if (cnt < 0) 845 goto data_err; 846 transflag = 0; 847 return (0); 848 849 case TYPE_E: 850 reply(553, "TYPE E not implemented."); 851 transflag = 0; 852 return (-1); 853 854 case TYPE_A: 855 while ((c = getc(instr)) != EOF) { 856 byte_count++; 857 if (c == '\n') 858 bare_lfs++; 859 while (c == '\r') { 860 if (ferror(outstr)) 861 goto data_err; 862 if ((c = getc(instr)) != '\n') { 863 (void) putc ('\r', outstr); 864 if (c == '\0' || c == EOF) 865 goto contin2; 866 } 867 } 868 (void) putc(c, outstr); 869 contin2: ; 870 } 871 fflush(outstr); 872 if (ferror(instr)) 873 goto data_err; 874 if (ferror(outstr)) 875 goto file_err; 876 transflag = 0; 877 if (bare_lfs) { 878 lreply(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 879 printf(" File may not have transferred correctly.\r\n"); 880 } 881 return (0); 882 default: 883 reply(550, "Unimplemented TYPE %d in receive_data", type); 884 transflag = 0; 885 return (-1); 886 } 887 888 data_err: 889 transflag = 0; 890 perror_reply(426, "Data Connection"); 891 return (-1); 892 893 file_err: 894 transflag = 0; 895 perror_reply(452, "Error writing file"); 896 return (-1); 897 } 898 899 statfilecmd(filename) 900 char *filename; 901 { 902 char line[BUFSIZ]; 903 FILE *fin; 904 int c; 905 906 (void) sprintf(line, "/bin/ls -lgA %s", filename); 907 fin = ftpd_popen(line, "r"); 908 lreply(211, "status of %s:", filename); 909 while ((c = getc(fin)) != EOF) { 910 if (c == '\n') { 911 if (ferror(stdout)){ 912 perror_reply(421, "control connection"); 913 (void) ftpd_pclose(fin); 914 dologout(1); 915 /* NOTREACHED */ 916 } 917 if (ferror(fin)) { 918 perror_reply(551, filename); 919 (void) ftpd_pclose(fin); 920 return; 921 } 922 (void) putc('\r', stdout); 923 } 924 (void) putc(c, stdout); 925 } 926 (void) ftpd_pclose(fin); 927 reply(211, "End of Status"); 928 } 929 930 statcmd() 931 { 932 struct sockaddr_in *sin; 933 u_char *a, *p; 934 935 lreply(211, "%s FTP server status:", hostname, version); 936 printf(" %s\r\n", version); 937 printf(" Connected to %s", remotehost); 938 if (!isdigit(remotehost[0])) 939 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 940 printf("\r\n"); 941 if (logged_in) { 942 if (guest) 943 printf(" Logged in anonymously\r\n"); 944 else 945 printf(" Logged in as %s\r\n", pw->pw_name); 946 } else if (askpasswd) 947 printf(" Waiting for password\r\n"); 948 else 949 printf(" Waiting for user name\r\n"); 950 printf(" TYPE: %s", typenames[type]); 951 if (type == TYPE_A || type == TYPE_E) 952 printf(", FORM: %s", formnames[form]); 953 if (type == TYPE_L) 954 #if NBBY == 8 955 printf(" %d", NBBY); 956 #else 957 printf(" %d", bytesize); /* need definition! */ 958 #endif 959 printf("; STRUcture: %s; transfer MODE: %s\r\n", 960 strunames[stru], modenames[mode]); 961 if (data != -1) 962 printf(" Data connection open\r\n"); 963 else if (pdata != -1) { 964 printf(" in Passive mode"); 965 sin = &pasv_addr; 966 goto printaddr; 967 } else if (usedefault == 0) { 968 printf(" PORT"); 969 sin = &data_dest; 970 printaddr: 971 a = (u_char *) &sin->sin_addr; 972 p = (u_char *) &sin->sin_port; 973 #define UC(b) (((int) b) & 0xff) 974 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 975 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 976 #undef UC 977 } else 978 printf(" No data connection\r\n"); 979 reply(211, "End of status"); 980 } 981 982 fatal(s) 983 char *s; 984 { 985 reply(451, "Error in server: %s\n", s); 986 reply(221, "Closing connection due to server error."); 987 dologout(0); 988 /* NOTREACHED */ 989 } 990 991 /* VARARGS2 */ 992 reply(n, fmt, p0, p1, p2, p3, p4, p5) 993 int n; 994 char *fmt; 995 { 996 printf("%d ", n); 997 printf(fmt, p0, p1, p2, p3, p4, p5); 998 printf("\r\n"); 999 (void)fflush(stdout); 1000 if (debug) { 1001 syslog(LOG_DEBUG, "<--- %d ", n); 1002 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 1003 } 1004 } 1005 1006 /* VARARGS2 */ 1007 lreply(n, fmt, p0, p1, p2, p3, p4, p5) 1008 int n; 1009 char *fmt; 1010 { 1011 printf("%d- ", n); 1012 printf(fmt, p0, p1, p2, p3, p4, p5); 1013 printf("\r\n"); 1014 (void)fflush(stdout); 1015 if (debug) { 1016 syslog(LOG_DEBUG, "<--- %d- ", n); 1017 syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); 1018 } 1019 } 1020 1021 ack(s) 1022 char *s; 1023 { 1024 reply(250, "%s command successful.", s); 1025 } 1026 1027 nack(s) 1028 char *s; 1029 { 1030 reply(502, "%s command not implemented.", s); 1031 } 1032 1033 /* ARGSUSED */ 1034 yyerror(s) 1035 char *s; 1036 { 1037 char *cp; 1038 1039 if (cp = index(cbuf,'\n')) 1040 *cp = '\0'; 1041 reply(500, "'%s': command not understood.", cbuf); 1042 } 1043 1044 delete(name) 1045 char *name; 1046 { 1047 struct stat st; 1048 1049 if (stat(name, &st) < 0) { 1050 perror_reply(550, name); 1051 return; 1052 } 1053 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1054 if (rmdir(name) < 0) { 1055 perror_reply(550, name); 1056 return; 1057 } 1058 goto done; 1059 } 1060 if (unlink(name) < 0) { 1061 perror_reply(550, name); 1062 return; 1063 } 1064 done: 1065 ack("DELE"); 1066 } 1067 1068 cwd(path) 1069 char *path; 1070 { 1071 if (chdir(path) < 0) 1072 perror_reply(550, path); 1073 else 1074 ack("CWD"); 1075 } 1076 1077 makedir(name) 1078 char *name; 1079 { 1080 if (mkdir(name, 0777) < 0) 1081 perror_reply(550, name); 1082 else 1083 reply(257, "MKD command successful."); 1084 } 1085 1086 removedir(name) 1087 char *name; 1088 { 1089 if (rmdir(name) < 0) 1090 perror_reply(550, name); 1091 else 1092 ack("RMD"); 1093 } 1094 1095 pwd() 1096 { 1097 char path[MAXPATHLEN + 1]; 1098 extern char *getwd(); 1099 1100 if (getwd(path) == (char *)NULL) 1101 reply(550, "%s.", path); 1102 else 1103 reply(257, "\"%s\" is current directory.", path); 1104 } 1105 1106 char * 1107 renamefrom(name) 1108 char *name; 1109 { 1110 struct stat st; 1111 1112 if (stat(name, &st) < 0) { 1113 perror_reply(550, name); 1114 return ((char *)0); 1115 } 1116 reply(350, "File exists, ready for destination name"); 1117 return (name); 1118 } 1119 1120 renamecmd(from, to) 1121 char *from, *to; 1122 { 1123 if (rename(from, to) < 0) 1124 perror_reply(550, "rename"); 1125 else 1126 ack("RNTO"); 1127 } 1128 1129 dolog(sin) 1130 struct sockaddr_in *sin; 1131 { 1132 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1133 sizeof (struct in_addr), AF_INET); 1134 1135 if (hp) 1136 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 1137 else 1138 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1139 sizeof (remotehost)); 1140 #ifdef SETPROCTITLE 1141 sprintf(proctitle, "%s: connected", remotehost); 1142 setproctitle(proctitle); 1143 #endif /* SETPROCTITLE */ 1144 1145 if (logging) 1146 syslog(LOG_INFO, "connection from %s", remotehost); 1147 } 1148 1149 /* 1150 * Record logout in wtmp file 1151 * and exit with supplied status. 1152 */ 1153 dologout(status) 1154 int status; 1155 { 1156 if (logged_in) { 1157 (void) seteuid((uid_t)0); 1158 logwtmp(ttyline, "", ""); 1159 } 1160 /* beware of flushing buffers after a SIGPIPE */ 1161 _exit(status); 1162 } 1163 1164 void 1165 myoob() 1166 { 1167 char *cp; 1168 1169 /* only process if transfer occurring */ 1170 if (!transflag) 1171 return; 1172 cp = tmpline; 1173 if (getline(cp, 7, stdin) == NULL) { 1174 reply(221, "You could at least say goodbye."); 1175 dologout(0); 1176 } 1177 upper(cp); 1178 if (strcmp(cp, "ABOR\r\n") == 0) { 1179 tmpline[0] = '\0'; 1180 reply(426, "Transfer aborted. Data connection closed."); 1181 reply(226, "Abort successful"); 1182 longjmp(urgcatch, 1); 1183 } 1184 if (strcmp(cp, "STAT\r\n") == 0) { 1185 if (file_size != (off_t) -1) 1186 reply(213, "Status: %lu of %lu bytes transferred", 1187 byte_count, file_size); 1188 else 1189 reply(213, "Status: %lu bytes transferred", byte_count); 1190 } 1191 } 1192 1193 /* 1194 * Note: a response of 425 is not mentioned as a possible response to 1195 * the PASV command in RFC959. However, it has been blessed as 1196 * a legitimate response by Jon Postel in a telephone conversation 1197 * with Rick Adams on 25 Jan 89. 1198 */ 1199 passive() 1200 { 1201 int len; 1202 register char *p, *a; 1203 1204 pdata = socket(AF_INET, SOCK_STREAM, 0); 1205 if (pdata < 0) { 1206 perror_reply(425, "Can't open passive connection"); 1207 return; 1208 } 1209 pasv_addr = ctrl_addr; 1210 pasv_addr.sin_port = 0; 1211 (void) seteuid((uid_t)0); 1212 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1213 (void) seteuid((uid_t)pw->pw_uid); 1214 goto pasv_error; 1215 } 1216 (void) seteuid((uid_t)pw->pw_uid); 1217 len = sizeof(pasv_addr); 1218 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1219 goto pasv_error; 1220 if (listen(pdata, 1) < 0) 1221 goto pasv_error; 1222 a = (char *) &pasv_addr.sin_addr; 1223 p = (char *) &pasv_addr.sin_port; 1224 1225 #define UC(b) (((int) b) & 0xff) 1226 1227 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1228 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1229 return; 1230 1231 pasv_error: 1232 (void) close(pdata); 1233 pdata = -1; 1234 perror_reply(425, "Can't open passive connection"); 1235 return; 1236 } 1237 1238 /* 1239 * Generate unique name for file with basename "local". 1240 * The file named "local" is already known to exist. 1241 * Generates failure reply on error. 1242 */ 1243 char * 1244 gunique(local) 1245 char *local; 1246 { 1247 static char new[MAXPATHLEN]; 1248 struct stat st; 1249 char *cp = rindex(local, '/'); 1250 int count = 0; 1251 1252 if (cp) 1253 *cp = '\0'; 1254 if (stat(cp ? local : ".", &st) < 0) { 1255 perror_reply(553, cp ? local : "."); 1256 return((char *) 0); 1257 } 1258 if (cp) 1259 *cp = '/'; 1260 (void) strcpy(new, local); 1261 cp = new + strlen(new); 1262 *cp++ = '.'; 1263 for (count = 1; count < 100; count++) { 1264 (void) sprintf(cp, "%d", count); 1265 if (stat(new, &st) < 0) 1266 return(new); 1267 } 1268 reply(452, "Unique file name cannot be created."); 1269 return((char *) 0); 1270 } 1271 1272 /* 1273 * Format and send reply containing system error number. 1274 */ 1275 perror_reply(code, string) 1276 int code; 1277 char *string; 1278 { 1279 reply(code, "%s: %s.", string, strerror(errno)); 1280 } 1281 1282 static char *onefile[] = { 1283 "", 1284 0 1285 }; 1286 1287 send_file_list(whichfiles) 1288 char *whichfiles; 1289 { 1290 struct stat st; 1291 DIR *dirp = NULL; 1292 struct dirent *dir; 1293 FILE *dout = NULL; 1294 register char **dirlist, *dirname; 1295 int simple = 0; 1296 char *strpbrk(); 1297 1298 if (strpbrk(whichfiles, "~{[*?") != NULL) { 1299 extern char **ftpglob(), *globerr; 1300 1301 globerr = NULL; 1302 dirlist = ftpglob(whichfiles); 1303 if (globerr != NULL) { 1304 reply(550, globerr); 1305 return; 1306 } else if (dirlist == NULL) { 1307 errno = ENOENT; 1308 perror_reply(550, whichfiles); 1309 return; 1310 } 1311 } else { 1312 onefile[0] = whichfiles; 1313 dirlist = onefile; 1314 simple = 1; 1315 } 1316 1317 if (setjmp(urgcatch)) { 1318 transflag = 0; 1319 return; 1320 } 1321 while (dirname = *dirlist++) { 1322 if (stat(dirname, &st) < 0) { 1323 /* 1324 * If user typed "ls -l", etc, and the client 1325 * used NLST, do what the user meant. 1326 */ 1327 if (dirname[0] == '-' && *dirlist == NULL && 1328 transflag == 0) { 1329 retrieve("/bin/ls %s", dirname); 1330 return; 1331 } 1332 perror_reply(550, whichfiles); 1333 if (dout != NULL) { 1334 (void) fclose(dout); 1335 transflag = 0; 1336 data = -1; 1337 pdata = -1; 1338 } 1339 return; 1340 } 1341 1342 if ((st.st_mode&S_IFMT) == S_IFREG) { 1343 if (dout == NULL) { 1344 dout = dataconn("file list", (off_t)-1, "w"); 1345 if (dout == NULL) 1346 return; 1347 transflag++; 1348 } 1349 fprintf(dout, "%s%s\n", dirname, 1350 type == TYPE_A ? "\r" : ""); 1351 byte_count += strlen(dirname) + 1; 1352 continue; 1353 } else if ((st.st_mode&S_IFMT) != S_IFDIR) 1354 continue; 1355 1356 if ((dirp = opendir(dirname)) == NULL) 1357 continue; 1358 1359 while ((dir = readdir(dirp)) != NULL) { 1360 char nbuf[MAXPATHLEN]; 1361 1362 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1363 continue; 1364 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1365 dir->d_namlen == 2) 1366 continue; 1367 1368 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1369 1370 /* 1371 * We have to do a stat to insure it's 1372 * not a directory or special file. 1373 */ 1374 if (simple || (stat(nbuf, &st) == 0 && 1375 (st.st_mode&S_IFMT) == S_IFREG)) { 1376 if (dout == NULL) { 1377 dout = dataconn("file list", (off_t)-1, 1378 "w"); 1379 if (dout == NULL) 1380 return; 1381 transflag++; 1382 } 1383 if (nbuf[0] == '.' && nbuf[1] == '/') 1384 fprintf(dout, "%s%s\n", &nbuf[2], 1385 type == TYPE_A ? "\r" : ""); 1386 else 1387 fprintf(dout, "%s%s\n", nbuf, 1388 type == TYPE_A ? "\r" : ""); 1389 byte_count += strlen(nbuf) + 1; 1390 } 1391 } 1392 (void) closedir(dirp); 1393 } 1394 1395 if (dout == NULL) 1396 reply(550, "No files found."); 1397 else if (ferror(dout) != 0) 1398 perror_reply(550, "Data connection"); 1399 else 1400 reply(226, "Transfer complete."); 1401 1402 transflag = 0; 1403 if (dout != NULL) 1404 (void) fclose(dout); 1405 data = -1; 1406 pdata = -1; 1407 } 1408 1409 #ifdef SETPROCTITLE 1410 /* 1411 * clobber argv so ps will show what we're doing. 1412 * (stolen from sendmail) 1413 * warning, since this is usually started from inetd.conf, it 1414 * often doesn't have much of an environment or arglist to overwrite. 1415 */ 1416 1417 /*VARARGS1*/ 1418 setproctitle(fmt, a, b, c) 1419 char *fmt; 1420 { 1421 register char *p, *bp, ch; 1422 register int i; 1423 char buf[BUFSIZ]; 1424 1425 (void) sprintf(buf, fmt, a, b, c); 1426 1427 /* make ps print our process name */ 1428 p = Argv[0]; 1429 *p++ = '-'; 1430 1431 i = strlen(buf); 1432 if (i > LastArgv - p - 2) { 1433 i = LastArgv - p - 2; 1434 buf[i] = '\0'; 1435 } 1436 bp = buf; 1437 while (ch = *bp++) 1438 if (ch != '\n' && ch != '\r') 1439 *p++ = ch; 1440 while (p < LastArgv) 1441 *p++ = ' '; 1442 } 1443 #endif /* SETPROCTITLE */ 1444