1 /* 2 * Copyright (c) 1985 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 char copyright[] = 9 "@(#) Copyright (c) 1985 Regents of the University of California.\n\ 10 All rights reserved.\n"; 11 #endif not lint 12 13 #ifndef lint 14 static char sccsid[] = "@(#)ftpd.c 5.9 (Berkeley) 04/23/87"; 15 #endif not lint 16 17 /* 18 * FTP server. 19 */ 20 #include <sys/param.h> 21 #include <sys/stat.h> 22 #include <sys/ioctl.h> 23 #include <sys/socket.h> 24 #include <sys/file.h> 25 #include <sys/wait.h> 26 27 #include <netinet/in.h> 28 29 #include <arpa/ftp.h> 30 #include <arpa/inet.h> 31 #include <arpa/telnet.h> 32 33 #include <stdio.h> 34 #include <signal.h> 35 #include <pwd.h> 36 #include <setjmp.h> 37 #include <netdb.h> 38 #include <errno.h> 39 #include <strings.h> 40 #include <syslog.h> 41 42 /* 43 * File containing login names 44 * NOT to be used on this machine. 45 * Commonly used to disallow uucp. 46 */ 47 #define FTPUSERS "/etc/ftpusers" 48 49 extern int errno; 50 extern char *sys_errlist[]; 51 extern char *crypt(); 52 extern char version[]; 53 extern char *home; /* pointer to home directory for glob */ 54 extern FILE *popen(), *fopen(), *freopen(); 55 extern int pclose(), fclose(); 56 extern char *getline(); 57 extern char cbuf[]; 58 59 struct sockaddr_in ctrl_addr; 60 struct sockaddr_in data_source; 61 struct sockaddr_in data_dest; 62 struct sockaddr_in his_addr; 63 64 int data; 65 jmp_buf errcatch, urgcatch; 66 int logged_in; 67 struct passwd *pw; 68 int debug; 69 int timeout = 900; /* timeout after 15 minutes of inactivity */ 70 int logging; 71 int guest; 72 int wtmp; 73 int type; 74 int form; 75 int stru; /* avoid C keyword */ 76 int mode; 77 int usedefault = 1; /* for data transfers */ 78 int pdata; /* for passive mode */ 79 int unique; 80 int transflag; 81 char tmpline[7]; 82 char hostname[32]; 83 char remotehost[32]; 84 85 /* 86 * Timeout intervals for retrying connections 87 * to hosts that don't accept PORT cmds. This 88 * is a kludge, but given the problems with TCP... 89 */ 90 #define SWAITMAX 90 /* wait at most 90 seconds */ 91 #define SWAITINT 5 /* interval between retries */ 92 93 int swaitmax = SWAITMAX; 94 int swaitint = SWAITINT; 95 96 int lostconn(); 97 int myoob(); 98 FILE *getdatasock(), *dataconn(); 99 100 main(argc, argv) 101 int argc; 102 char *argv[]; 103 { 104 int addrlen, on = 1; 105 long pgid; 106 char *cp; 107 108 addrlen = sizeof (his_addr); 109 if (getpeername(0, &his_addr, &addrlen) < 0) { 110 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 111 exit(1); 112 } 113 addrlen = sizeof (ctrl_addr); 114 if (getsockname(0, (char *) &ctrl_addr, &addrlen) < 0) { 115 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 116 exit(1); 117 } 118 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 119 debug = 0; 120 openlog("ftpd", LOG_PID, LOG_DAEMON); 121 argc--, argv++; 122 while (argc > 0 && *argv[0] == '-') { 123 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 124 125 case 'v': 126 debug = 1; 127 break; 128 129 case 'd': 130 debug = 1; 131 break; 132 133 case 'l': 134 logging = 1; 135 break; 136 137 case 't': 138 timeout = atoi(++cp); 139 goto nextopt; 140 break; 141 142 default: 143 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 144 *cp); 145 break; 146 } 147 nextopt: 148 argc--, argv++; 149 } 150 (void) freopen("/dev/null", "w", stderr); 151 (void) signal(SIGPIPE, lostconn); 152 (void) signal(SIGCHLD, SIG_IGN); 153 if (signal(SIGURG, myoob) < 0) { 154 syslog(LOG_ERR, "signal: %m"); 155 } 156 /* handle urgent data inline */ 157 #ifdef SO_OOBINLINE 158 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) { 159 syslog(LOG_ERR, "setsockopt: %m"); 160 } 161 #endif SO_OOBINLINE 162 pgid = getpid(); 163 if (ioctl(fileno(stdin), SIOCSPGRP, (char *) &pgid) < 0) { 164 syslog(LOG_ERR, "ioctl: %m"); 165 } 166 dolog(&his_addr); 167 /* do telnet option negotiation here */ 168 /* 169 * Set up default state 170 */ 171 logged_in = 0; 172 data = -1; 173 type = TYPE_A; 174 form = FORM_N; 175 stru = STRU_F; 176 mode = MODE_S; 177 tmpline[0] = '\0'; 178 (void) gethostname(hostname, sizeof (hostname)); 179 reply(220, "%s FTP server (%s) ready.", 180 hostname, version); 181 for (;;) { 182 (void) setjmp(errcatch); 183 (void) yyparse(); 184 } 185 } 186 187 lostconn() 188 { 189 190 if (debug) 191 syslog(LOG_DEBUG, "lost connection"); 192 dologout(-1); 193 } 194 195 pass(passwd) 196 char *passwd; 197 { 198 char *xpasswd, *savestr(); 199 static struct passwd save; 200 201 if (logged_in || pw == NULL) { 202 reply(503, "Login with USER first."); 203 return; 204 } 205 if (!guest) { /* "ftp" is only account allowed no password */ 206 xpasswd = crypt(passwd, pw->pw_passwd); 207 /* The strcmp does not catch null passwords! */ 208 if (*pw->pw_passwd == '\0' || strcmp(xpasswd, pw->pw_passwd)) { 209 reply(530, "Login incorrect."); 210 pw = NULL; 211 return; 212 } 213 } 214 setegid(pw->pw_gid); 215 initgroups(pw->pw_name, pw->pw_gid); 216 if (chdir(pw->pw_dir)) { 217 reply(530, "User %s: can't change directory to %s.", 218 pw->pw_name, pw->pw_dir); 219 goto bad; 220 } 221 222 /* grab wtmp before chroot */ 223 wtmp = open("/usr/adm/wtmp", O_WRONLY|O_APPEND); 224 if (guest && chroot(pw->pw_dir) < 0) { 225 reply(550, "Can't set guest privileges."); 226 if (wtmp >= 0) { 227 (void) close(wtmp); 228 wtmp = -1; 229 } 230 goto bad; 231 } 232 if (!guest) 233 reply(230, "User %s logged in.", pw->pw_name); 234 else 235 reply(230, "Guest login ok, access restrictions apply."); 236 logged_in = 1; 237 dologin(pw); 238 seteuid(pw->pw_uid); 239 /* 240 * Save everything so globbing doesn't 241 * clobber the fields. 242 */ 243 save = *pw; 244 save.pw_name = savestr(pw->pw_name); 245 save.pw_passwd = savestr(pw->pw_passwd); 246 save.pw_comment = savestr(pw->pw_comment); 247 save.pw_gecos = savestr(pw->pw_gecos); 248 save.pw_dir = savestr(pw->pw_dir); 249 save.pw_shell = savestr(pw->pw_shell); 250 pw = &save; 251 home = pw->pw_dir; /* home dir for globbing */ 252 return; 253 bad: 254 seteuid(0); 255 pw = NULL; 256 } 257 258 char * 259 savestr(s) 260 char *s; 261 { 262 char *malloc(); 263 char *new = malloc((unsigned) strlen(s) + 1); 264 265 if (new != NULL) 266 (void) strcpy(new, s); 267 return (new); 268 } 269 270 retrieve(cmd, name) 271 char *cmd, *name; 272 { 273 FILE *fin, *dout; 274 struct stat st; 275 int (*closefunc)(), tmp; 276 277 if (cmd == 0) { 278 #ifdef notdef 279 /* no remote command execution -- it's a security hole */ 280 if (*name == '|') 281 fin = popen(name + 1, "r"), closefunc = pclose; 282 else 283 #endif 284 fin = fopen(name, "r"), closefunc = fclose; 285 } else { 286 char line[BUFSIZ]; 287 288 (void) sprintf(line, cmd, name), name = line; 289 fin = popen(line, "r"), closefunc = pclose; 290 } 291 if (fin == NULL) { 292 if (errno != 0) 293 reply(550, "%s: %s.", name, sys_errlist[errno]); 294 return; 295 } 296 st.st_size = 0; 297 if (cmd == 0 && 298 (stat(name, &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 299 reply(550, "%s: not a plain file.", name); 300 goto done; 301 } 302 dout = dataconn(name, st.st_size, "w"); 303 if (dout == NULL) 304 goto done; 305 if ((tmp = send_data(fin, dout)) > 0 || ferror(dout) > 0) { 306 reply(550, "%s: %s.", name, sys_errlist[errno]); 307 } 308 else if (tmp == 0) { 309 reply(226, "Transfer complete."); 310 } 311 (void) fclose(dout); 312 data = -1; 313 pdata = -1; 314 done: 315 (*closefunc)(fin); 316 } 317 318 store(name, mode) 319 char *name, *mode; 320 { 321 FILE *fout, *din; 322 int (*closefunc)(), dochown = 0, tmp; 323 char *gunique(), *local; 324 325 #ifdef notdef 326 /* no remote command execution -- it's a security hole */ 327 if (name[0] == '|') 328 fout = popen(&name[1], "w"), closefunc = pclose; 329 else 330 #endif 331 { 332 struct stat st; 333 334 local = name; 335 if (stat(name, &st) < 0) { 336 dochown++; 337 } 338 else if (unique) { 339 if ((local = gunique(name)) == NULL) { 340 return; 341 } 342 dochown++; 343 } 344 fout = fopen(local, mode), closefunc = fclose; 345 } 346 if (fout == NULL) { 347 reply(553, "%s: %s.", local, sys_errlist[errno]); 348 return; 349 } 350 din = dataconn(local, (off_t)-1, "r"); 351 if (din == NULL) 352 goto done; 353 if ((tmp = receive_data(din, fout)) > 0 || ferror(fout) > 0) { 354 reply(552, "%s: %s.", local, sys_errlist[errno]); 355 } 356 else if (tmp == 0 && !unique) { 357 reply(226, "Transfer complete."); 358 } 359 else if (tmp == 0 && unique) { 360 reply(226, "Transfer complete (unique file name:%s).", local); 361 } 362 (void) fclose(din); 363 data = -1; 364 pdata = -1; 365 done: 366 if (dochown) 367 (void) chown(local, pw->pw_uid, -1); 368 (*closefunc)(fout); 369 } 370 371 FILE * 372 getdatasock(mode) 373 char *mode; 374 { 375 int s, on = 1; 376 377 if (data >= 0) 378 return (fdopen(data, mode)); 379 s = socket(AF_INET, SOCK_STREAM, 0); 380 if (s < 0) 381 return (NULL); 382 seteuid(0); 383 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof (on)) < 0) 384 goto bad; 385 /* anchor socket to avoid multi-homing problems */ 386 data_source.sin_family = AF_INET; 387 data_source.sin_addr = ctrl_addr.sin_addr; 388 if (bind(s, &data_source, sizeof (data_source)) < 0) 389 goto bad; 390 seteuid(pw->pw_uid); 391 return (fdopen(s, mode)); 392 bad: 393 seteuid(pw->pw_uid); 394 (void) close(s); 395 return (NULL); 396 } 397 398 FILE * 399 dataconn(name, size, mode) 400 char *name; 401 off_t size; 402 char *mode; 403 { 404 char sizebuf[32]; 405 FILE *file; 406 int retry = 0; 407 408 if (size >= 0) 409 (void) sprintf (sizebuf, " (%ld bytes)", size); 410 else 411 (void) strcpy(sizebuf, ""); 412 if (pdata > 0) { 413 struct sockaddr_in from; 414 int s, fromlen = sizeof(from); 415 416 s = accept(pdata, &from, &fromlen); 417 if (s < 0) { 418 reply(425, "Can't open data connection."); 419 (void) close(pdata); 420 pdata = -1; 421 return(NULL); 422 } 423 (void) close(pdata); 424 pdata = s; 425 reply(150, "Openning data connection for %s (%s,%d)%s.", 426 name, inet_ntoa(from.sin_addr), 427 ntohs(from.sin_port), sizebuf); 428 return(fdopen(pdata, mode)); 429 } 430 if (data >= 0) { 431 reply(125, "Using existing data connection for %s%s.", 432 name, sizebuf); 433 usedefault = 1; 434 return (fdopen(data, mode)); 435 } 436 if (usedefault) 437 data_dest = his_addr; 438 usedefault = 1; 439 file = getdatasock(mode); 440 if (file == NULL) { 441 reply(425, "Can't create data socket (%s,%d): %s.", 442 inet_ntoa(data_source.sin_addr), 443 ntohs(data_source.sin_port), 444 sys_errlist[errno]); 445 return (NULL); 446 } 447 data = fileno(file); 448 while (connect(data, &data_dest, sizeof (data_dest)) < 0) { 449 if (errno == EADDRINUSE && retry < swaitmax) { 450 sleep((unsigned) swaitint); 451 retry += swaitint; 452 continue; 453 } 454 reply(425, "Can't build data connection: %s.", 455 sys_errlist[errno]); 456 (void) fclose(file); 457 data = -1; 458 return (NULL); 459 } 460 reply(150, "Opening data connection for %s (%s,%d)%s.", 461 name, inet_ntoa(data_dest.sin_addr), 462 ntohs(data_dest.sin_port), sizebuf); 463 return (file); 464 } 465 466 /* 467 * Tranfer the contents of "instr" to 468 * "outstr" peer using the appropriate 469 * encapulation of the date subject 470 * to Mode, Structure, and Type. 471 * 472 * NB: Form isn't handled. 473 */ 474 send_data(instr, outstr) 475 FILE *instr, *outstr; 476 { 477 register int c; 478 int netfd, filefd, cnt; 479 char buf[BUFSIZ]; 480 481 transflag++; 482 if (setjmp(urgcatch)) { 483 transflag = 0; 484 return(-1); 485 } 486 switch (type) { 487 488 case TYPE_A: 489 while ((c = getc(instr)) != EOF) { 490 if (c == '\n') { 491 if (ferror (outstr)) { 492 transflag = 0; 493 return (1); 494 } 495 (void) putc('\r', outstr); 496 } 497 (void) putc(c, outstr); 498 /* if (c == '\r') */ 499 /* putc ('\0', outstr); */ 500 } 501 transflag = 0; 502 if (ferror (instr) || ferror (outstr)) { 503 return (1); 504 } 505 return (0); 506 507 case TYPE_I: 508 case TYPE_L: 509 netfd = fileno(outstr); 510 filefd = fileno(instr); 511 512 while ((cnt = read(filefd, buf, sizeof (buf))) > 0) { 513 if (write(netfd, buf, cnt) < 0) { 514 transflag = 0; 515 return (1); 516 } 517 } 518 transflag = 0; 519 return (cnt < 0); 520 } 521 reply(550, "Unimplemented TYPE %d in send_data", type); 522 transflag = 0; 523 return (-1); 524 } 525 526 /* 527 * Transfer data from peer to 528 * "outstr" using the appropriate 529 * encapulation of the data subject 530 * to Mode, Structure, and Type. 531 * 532 * N.B.: Form isn't handled. 533 */ 534 receive_data(instr, outstr) 535 FILE *instr, *outstr; 536 { 537 register int c; 538 int cnt; 539 char buf[BUFSIZ]; 540 541 542 transflag++; 543 if (setjmp(urgcatch)) { 544 transflag = 0; 545 return(-1); 546 } 547 switch (type) { 548 549 case TYPE_I: 550 case TYPE_L: 551 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 552 if (write(fileno(outstr), buf, cnt) < 0) { 553 transflag = 0; 554 return (1); 555 } 556 } 557 transflag = 0; 558 return (cnt < 0); 559 560 case TYPE_E: 561 reply(553, "TYPE E not implemented."); 562 transflag = 0; 563 return (-1); 564 565 case TYPE_A: 566 while ((c = getc(instr)) != EOF) { 567 while (c == '\r') { 568 if (ferror (outstr)) { 569 transflag = 0; 570 return (1); 571 } 572 if ((c = getc(instr)) != '\n') 573 (void) putc ('\r', outstr); 574 /* if (c == '\0') */ 575 /* continue; */ 576 } 577 (void) putc (c, outstr); 578 } 579 transflag = 0; 580 if (ferror (instr) || ferror (outstr)) 581 return (1); 582 return (0); 583 } 584 transflag = 0; 585 fatal("Unknown type in receive_data."); 586 /*NOTREACHED*/ 587 } 588 589 fatal(s) 590 char *s; 591 { 592 reply(451, "Error in server: %s\n", s); 593 reply(221, "Closing connection due to server error."); 594 dologout(0); 595 } 596 597 /*VARARGS2*/ 598 reply(n, s, args) 599 int n; 600 char *s; 601 { 602 603 printf("%d ", n); 604 _doprnt(s, &args, stdout); 605 printf("\r\n"); 606 (void) fflush(stdout); 607 if (debug) { 608 syslog(LOG_DEBUG, "<--- %d ", n); 609 syslog(LOG_DEBUG, s, &args); 610 } 611 } 612 613 /*VARARGS2*/ 614 lreply(n, s, args) 615 int n; 616 char *s; 617 { 618 printf("%d-", n); 619 _doprnt(s, &args, stdout); 620 printf("\r\n"); 621 (void) fflush(stdout); 622 if (debug) { 623 syslog(LOG_DEBUG, "<--- %d- ", n); 624 syslog(LOG_DEBUG, s, &args); 625 } 626 } 627 628 ack(s) 629 char *s; 630 { 631 reply(250, "%s command successful.", s); 632 } 633 634 nack(s) 635 char *s; 636 { 637 reply(502, "%s command not implemented.", s); 638 } 639 640 yyerror(s) 641 char *s; 642 { 643 char *cp; 644 645 cp = index(cbuf,'\n'); 646 *cp = '\0'; 647 reply(500, "'%s': command not understood.",cbuf); 648 } 649 650 delete(name) 651 char *name; 652 { 653 struct stat st; 654 655 if (stat(name, &st) < 0) { 656 reply(550, "%s: %s.", name, sys_errlist[errno]); 657 return; 658 } 659 if ((st.st_mode&S_IFMT) == S_IFDIR) { 660 if (rmdir(name) < 0) { 661 reply(550, "%s: %s.", name, sys_errlist[errno]); 662 return; 663 } 664 goto done; 665 } 666 if (unlink(name) < 0) { 667 reply(550, "%s: %s.", name, sys_errlist[errno]); 668 return; 669 } 670 done: 671 ack("DELE"); 672 } 673 674 cwd(path) 675 char *path; 676 { 677 678 if (chdir(path) < 0) { 679 reply(550, "%s: %s.", path, sys_errlist[errno]); 680 return; 681 } 682 ack("CWD"); 683 } 684 685 makedir(name) 686 char *name; 687 { 688 struct stat st; 689 int dochown = stat(name, &st) < 0; 690 691 if (mkdir(name, 0777) < 0) { 692 reply(550, "%s: %s.", name, sys_errlist[errno]); 693 return; 694 } 695 if (dochown) 696 (void) chown(name, pw->pw_uid, -1); 697 reply(257, "MKD command successful."); 698 } 699 700 removedir(name) 701 char *name; 702 { 703 704 if (rmdir(name) < 0) { 705 reply(550, "%s: %s.", name, sys_errlist[errno]); 706 return; 707 } 708 ack("RMD"); 709 } 710 711 pwd() 712 { 713 char path[MAXPATHLEN + 1]; 714 715 if (getwd(path) == NULL) { 716 reply(550, "%s.", path); 717 return; 718 } 719 reply(257, "\"%s\" is current directory.", path); 720 } 721 722 char * 723 renamefrom(name) 724 char *name; 725 { 726 struct stat st; 727 728 if (stat(name, &st) < 0) { 729 reply(550, "%s: %s.", name, sys_errlist[errno]); 730 return ((char *)0); 731 } 732 reply(350, "File exists, ready for destination name"); 733 return (name); 734 } 735 736 renamecmd(from, to) 737 char *from, *to; 738 { 739 740 if (rename(from, to) < 0) { 741 reply(550, "rename: %s.", sys_errlist[errno]); 742 return; 743 } 744 ack("RNTO"); 745 } 746 747 dolog(sin) 748 struct sockaddr_in *sin; 749 { 750 struct hostent *hp = gethostbyaddr(&sin->sin_addr, 751 sizeof (struct in_addr), AF_INET); 752 time_t t; 753 extern char *ctime(); 754 755 if (hp) { 756 (void) strncpy(remotehost, hp->h_name, sizeof (remotehost)); 757 endhostent(); 758 } else 759 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 760 sizeof (remotehost)); 761 if (!logging) 762 return; 763 t = time((time_t *) 0); 764 syslog(LOG_INFO,"FTPD: connection from %s at %s", remotehost, ctime(&t)); 765 } 766 767 #include <utmp.h> 768 769 #define SCPYN(a, b) (void) strncpy(a, b, sizeof (a)) 770 struct utmp utmp; 771 772 /* 773 * Record login in wtmp file. 774 */ 775 dologin(pw) 776 struct passwd *pw; 777 { 778 char line[32]; 779 780 if (wtmp >= 0) { 781 /* hack, but must be unique and no tty line */ 782 (void) sprintf(line, "ftp%d", getpid()); 783 SCPYN(utmp.ut_line, line); 784 SCPYN(utmp.ut_name, pw->pw_name); 785 SCPYN(utmp.ut_host, remotehost); 786 utmp.ut_time = (long) time((time_t *) 0); 787 (void) write(wtmp, (char *)&utmp, sizeof (utmp)); 788 if (!guest) { /* anon must hang on */ 789 (void) close(wtmp); 790 wtmp = -1; 791 } 792 } 793 } 794 795 /* 796 * Record logout in wtmp file 797 * and exit with supplied status. 798 */ 799 dologout(status) 800 int status; 801 { 802 803 if (logged_in) { 804 (void) seteuid(0); 805 if (wtmp < 0) 806 wtmp = open("/usr/adm/wtmp", O_WRONLY|O_APPEND); 807 if (wtmp >= 0) { 808 SCPYN(utmp.ut_name, ""); 809 SCPYN(utmp.ut_host, ""); 810 utmp.ut_time = (long) time((time_t *) 0); 811 (void) write(wtmp, (char *)&utmp, sizeof (utmp)); 812 (void) close(wtmp); 813 } 814 } 815 /* beware of flushing buffers after a SIGPIPE */ 816 _exit(status); 817 } 818 819 /* 820 * Special version of popen which avoids 821 * call to shell. This insures noone may 822 * create a pipe to a hidden program as a side 823 * effect of a list or dir command. 824 */ 825 #define tst(a,b) (*mode == 'r'? (b) : (a)) 826 #define RDR 0 827 #define WTR 1 828 static int popen_pid[5]; 829 830 static char * 831 nextarg(cpp) 832 char *cpp; 833 { 834 register char *cp = cpp; 835 836 if (cp == 0) 837 return (cp); 838 while (*cp && *cp != ' ' && *cp != '\t') 839 cp++; 840 if (*cp == ' ' || *cp == '\t') { 841 *cp++ = '\0'; 842 while (*cp == ' ' || *cp == '\t') 843 cp++; 844 } 845 if (cp == cpp) 846 return ((char *)0); 847 return (cp); 848 } 849 850 FILE * 851 popen(cmd, mode) 852 char *cmd, *mode; 853 { 854 int p[2], ac, gac; 855 register myside, hisside, pid; 856 char *av[20], *gav[512]; 857 register char *cp; 858 859 if (pipe(p) < 0) 860 return (NULL); 861 cp = cmd, ac = 0; 862 /* break up string into pieces */ 863 do { 864 av[ac++] = cp; 865 cp = nextarg(cp); 866 } while (cp && *cp && ac < 20); 867 av[ac] = (char *)0; 868 gav[0] = av[0]; 869 /* glob each piece */ 870 for (gac = ac = 1; av[ac] != NULL; ac++) { 871 char **pop; 872 extern char **glob(), **copyblk(); 873 874 pop = glob(av[ac]); 875 if (pop == (char **)NULL) { /* globbing failed */ 876 char *vv[2]; 877 878 vv[0] = av[ac]; 879 vv[1] = 0; 880 pop = copyblk(vv); 881 } 882 av[ac] = (char *)pop; /* save to free later */ 883 while (*pop && gac < 512) 884 gav[gac++] = *pop++; 885 } 886 gav[gac] = (char *)0; 887 myside = tst(p[WTR], p[RDR]); 888 hisside = tst(p[RDR], p[WTR]); 889 if ((pid = fork()) == 0) { 890 /* myside and hisside reverse roles in child */ 891 (void) close(myside); 892 (void) dup2(hisside, tst(0, 1)); 893 (void) close(hisside); 894 execv(gav[0], gav); 895 _exit(1); 896 } 897 for (ac = 1; av[ac] != NULL; ac++) 898 blkfree((char **)av[ac]); 899 if (pid == -1) 900 return (NULL); 901 popen_pid[myside] = pid; 902 (void) close(hisside); 903 return (fdopen(myside, mode)); 904 } 905 906 pclose(ptr) 907 FILE *ptr; 908 { 909 register f, r, (*hstat)(), (*istat)(), (*qstat)(); 910 int status; 911 912 f = fileno(ptr); 913 (void) fclose(ptr); 914 istat = signal(SIGINT, SIG_IGN); 915 qstat = signal(SIGQUIT, SIG_IGN); 916 hstat = signal(SIGHUP, SIG_IGN); 917 while ((r = wait(&status)) != popen_pid[f] && r != -1) 918 ; 919 if (r == -1) 920 status = -1; 921 (void) signal(SIGINT, istat); 922 (void) signal(SIGQUIT, qstat); 923 (void) signal(SIGHUP, hstat); 924 return (status); 925 } 926 927 /* 928 * Check user requesting login priviledges. 929 * Disallow anyone who does not have a standard 930 * shell returned by getusershell() (/etc/shells). 931 * Disallow anyone mentioned in the file FTPUSERS 932 * to allow people such as uucp to be avoided. 933 */ 934 checkuser(name) 935 register char *name; 936 { 937 register char *cp; 938 char line[BUFSIZ], *index(), *getusershell(); 939 FILE *fd; 940 struct passwd *pw; 941 int found = 0; 942 943 pw = getpwnam(name); 944 if (pw == NULL) 945 return (0); 946 if (pw ->pw_shell == NULL || pw->pw_shell[0] == NULL) 947 pw->pw_shell = "/bin/sh"; 948 while ((cp = getusershell()) != NULL) 949 if (strcmp(cp, pw->pw_shell) == 0) 950 break; 951 endusershell(); 952 if (cp == NULL) 953 return (0); 954 fd = fopen(FTPUSERS, "r"); 955 if (fd == NULL) 956 return (1); 957 while (fgets(line, sizeof (line), fd) != NULL) { 958 cp = index(line, '\n'); 959 if (cp) 960 *cp = '\0'; 961 if (strcmp(line, name) == 0) { 962 found++; 963 break; 964 } 965 } 966 (void) fclose(fd); 967 return (!found); 968 } 969 970 myoob() 971 { 972 char *cp; 973 974 /* only process if transfer occurring */ 975 if (!transflag) { 976 return; 977 } 978 cp = tmpline; 979 if (getline(cp, 7, stdin) == NULL) { 980 reply(221, "You could at least say goodby."); 981 dologout(0); 982 } 983 upper(cp); 984 if (strcmp(cp, "ABOR\r\n")) 985 return; 986 tmpline[0] = '\0'; 987 reply(426,"Transfer aborted. Data connection closed."); 988 reply(226,"Abort successful"); 989 longjmp(urgcatch, 1); 990 } 991 992 /* 993 * Note: The 530 reply codes could be 4xx codes, except nothing is 994 * given in the state tables except 421 which implies an exit. (RFC959) 995 */ 996 passive() 997 { 998 int len; 999 struct sockaddr_in tmp; 1000 register char *p, *a; 1001 1002 pdata = socket(AF_INET, SOCK_STREAM, 0); 1003 if (pdata < 0) { 1004 reply(530, "Can't open passive connection"); 1005 return; 1006 } 1007 tmp = ctrl_addr; 1008 tmp.sin_port = 0; 1009 seteuid(0); 1010 if (bind(pdata, (struct sockaddr *) &tmp, sizeof(tmp)) < 0) { 1011 seteuid(pw->pw_uid); 1012 (void) close(pdata); 1013 pdata = -1; 1014 reply(530, "Can't open passive connection"); 1015 return; 1016 } 1017 seteuid(pw->pw_uid); 1018 len = sizeof(tmp); 1019 if (getsockname(pdata, (char *) &tmp, &len) < 0) { 1020 (void) close(pdata); 1021 pdata = -1; 1022 reply(530, "Can't open passive connection"); 1023 return; 1024 } 1025 if (listen(pdata, 1) < 0) { 1026 (void) close(pdata); 1027 pdata = -1; 1028 reply(530, "Can't open passive connection"); 1029 return; 1030 } 1031 a = (char *) &tmp.sin_addr; 1032 p = (char *) &tmp.sin_port; 1033 1034 #define UC(b) (((int) b) & 0xff) 1035 1036 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1037 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1038 } 1039 1040 char * 1041 gunique(local) 1042 char *local; 1043 { 1044 static char new[MAXPATHLEN]; 1045 char *cp = rindex(local, '/'); 1046 int d, count=0; 1047 char ext = '1'; 1048 1049 if (cp) { 1050 *cp = '\0'; 1051 } 1052 d = access(cp ? local : ".", 2); 1053 if (cp) { 1054 *cp = '/'; 1055 } 1056 if (d < 0) { 1057 syslog(LOG_ERR, "%s: %m", local); 1058 return((char *) 0); 1059 } 1060 (void) strcpy(new, local); 1061 cp = new + strlen(new); 1062 *cp++ = '.'; 1063 while (!d) { 1064 if (++count == 100) { 1065 reply(452, "Unique file name not cannot be created."); 1066 return((char *) 0); 1067 } 1068 *cp++ = ext; 1069 *cp = '\0'; 1070 if (ext == '9') { 1071 ext = '0'; 1072 } 1073 else { 1074 ext++; 1075 } 1076 if ((d = access(new, 0)) < 0) { 1077 break; 1078 } 1079 if (ext != '0') { 1080 cp--; 1081 } 1082 else if (*(cp - 2) == '.') { 1083 *(cp - 1) = '1'; 1084 } 1085 else { 1086 *(cp - 2) = *(cp - 2) + 1; 1087 cp--; 1088 } 1089 } 1090 return(new); 1091 } 1092