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 5.2 (Berkeley) 02/03/86"; 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 41 /* 42 * File containing login names 43 * NOT to be used on this machine. 44 * Commonly used to disallow uucp. 45 */ 46 #define FTPUSERS "/etc/ftpusers" 47 48 extern int errno; 49 extern char *sys_errlist[]; 50 extern char *crypt(); 51 extern char version[]; 52 extern char *home; /* pointer to home directory for glob */ 53 extern FILE *popen(), *fopen(), *freopen(); 54 extern int pclose(), fclose(); 55 extern char *getline(); 56 extern char cbuf[]; 57 58 struct sockaddr_in ctrl_addr; 59 struct sockaddr_in data_source; 60 struct sockaddr_in data_dest; 61 struct sockaddr_in his_addr; 62 63 struct hostent *hp; 64 65 int data; 66 jmp_buf errcatch, urgcatch; 67 int logged_in; 68 struct passwd *pw; 69 int debug; 70 int timeout; 71 int logging; 72 int guest; 73 int wtmp; 74 int type; 75 int form; 76 int stru; /* avoid C keyword */ 77 int mode; 78 int usedefault = 1; /* for data transfers */ 79 int pdata; /* for passive mode */ 80 int unique; 81 int transflag; 82 char tmpline[7]; 83 char hostname[32]; 84 char remotehost[32]; 85 86 /* 87 * Timeout intervals for retrying connections 88 * to hosts that don't accept PORT cmds. This 89 * is a kludge, but given the problems with TCP... 90 */ 91 #define SWAITMAX 90 /* wait at most 90 seconds */ 92 #define SWAITINT 5 /* interval between retries */ 93 94 int swaitmax = SWAITMAX; 95 int swaitint = SWAITINT; 96 97 int lostconn(); 98 int reapchild(); 99 int myoob(); 100 FILE *getdatasock(), *dataconn(); 101 102 main(argc, argv) 103 int argc; 104 char *argv[]; 105 { 106 int options = 0, addrlen; 107 long pgid; 108 char *cp; 109 110 addrlen = sizeof (his_addr); 111 if (getpeername(0, &his_addr, &addrlen) < 0) { 112 fprintf(stderr, "%s: ", argv[0]); 113 perror("getpeername"); 114 exit(1); 115 } 116 addrlen = sizeof (ctrl_addr); 117 if (getsockname(0, &ctrl_addr, &addrlen) < 0) { 118 fprintf(stderr, "%s: ", argv[0]); 119 perror("getsockname"); 120 exit(1); 121 } 122 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 123 debug = 0; 124 argc--, argv++; 125 while (argc > 0 && *argv[0] == '-') { 126 for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { 127 128 case 'v': 129 debug = 1; 130 break; 131 132 case 'd': 133 debug = 1; 134 options |= SO_DEBUG; 135 break; 136 137 case 'l': 138 logging = 1; 139 (void) freopen("/tmp/ftplog", "a", stderr); 140 break; 141 142 case 't': 143 timeout = atoi(++cp); 144 goto nextopt; 145 break; 146 147 default: 148 fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", 149 *cp); 150 break; 151 } 152 nextopt: 153 argc--, argv++; 154 } 155 signal(SIGPIPE, lostconn); 156 signal(SIGCHLD, SIG_IGN); 157 if (signal(SIGURG, myoob) < 0) { 158 perror("signal"); 159 } 160 pgid = getpid(); 161 if (ioctl(fileno(stdin), SIOCSPGRP, (char *) &pgid) < 0) { 162 perror("ioctl"); 163 } 164 dolog(&his_addr); 165 /* do telnet option negotiation here */ 166 /* 167 * Set up default state 168 */ 169 logged_in = 0; 170 data = -1; 171 type = TYPE_A; 172 form = FORM_N; 173 stru = STRU_F; 174 mode = MODE_S; 175 tmpline[0] = '\0'; 176 gethostname(hostname, sizeof (hostname)); 177 reply(220, "%s FTP server (%s) ready.", 178 hostname, version); 179 for (;;) { 180 setjmp(errcatch); 181 yyparse(); 182 } 183 } 184 185 reapchild() 186 { 187 union wait status; 188 189 while (wait3(&status, WNOHANG, 0) > 0) 190 ; 191 } 192 193 lostconn() 194 { 195 196 if (debug) 197 fprintf(stderr, "Lost connection.\n"); 198 dologout(-1); 199 } 200 201 pass(passwd) 202 char *passwd; 203 { 204 char *xpasswd, *savestr(); 205 static struct passwd save; 206 207 if (logged_in || pw == NULL) { 208 reply(503, "Login with USER first."); 209 return; 210 } 211 if (!guest) { /* "ftp" is only account allowed no password */ 212 xpasswd = crypt(passwd, pw->pw_passwd); 213 /* The strcmp does not catch null passwords! */ 214 if (*pw->pw_passwd == '\0' || strcmp(xpasswd, pw->pw_passwd)) { 215 reply(530, "Login incorrect."); 216 pw = NULL; 217 return; 218 } 219 } 220 setegid(pw->pw_gid); 221 initgroups(pw->pw_name, pw->pw_gid); 222 if (chdir(pw->pw_dir)) { 223 reply(550, "User %s: can't change directory to %s.", 224 pw->pw_name, pw->pw_dir); 225 goto bad; 226 } 227 228 /* grab wtmp before chroot */ 229 wtmp = open("/usr/adm/wtmp", O_WRONLY|O_APPEND); 230 if (guest && chroot(pw->pw_dir) < 0) { 231 reply(550, "Can't set guest privileges."); 232 if (wtmp >= 0) { 233 (void) close(wtmp); 234 wtmp = -1; 235 } 236 goto bad; 237 } 238 if (!guest) 239 reply(230, "User %s logged in.", pw->pw_name); 240 else 241 reply(230, "Guest login ok, access restrictions apply."); 242 logged_in = 1; 243 dologin(pw); 244 seteuid(pw->pw_uid); 245 /* 246 * Save everything so globbing doesn't 247 * clobber the fields. 248 */ 249 save = *pw; 250 save.pw_name = savestr(pw->pw_name); 251 save.pw_passwd = savestr(pw->pw_passwd); 252 save.pw_comment = savestr(pw->pw_comment); 253 save.pw_gecos = savestr(pw->pw_gecos, &save.pw_gecos); 254 save.pw_dir = savestr(pw->pw_dir); 255 save.pw_shell = savestr(pw->pw_shell); 256 pw = &save; 257 home = pw->pw_dir; /* home dir for globbing */ 258 return; 259 bad: 260 seteuid(0); 261 pw = NULL; 262 } 263 264 char * 265 savestr(s) 266 char *s; 267 { 268 char *malloc(); 269 char *new = malloc(strlen(s) + 1); 270 271 if (new != NULL) 272 strcpy(new, s); 273 return (new); 274 } 275 276 retrieve(cmd, name) 277 char *cmd, *name; 278 { 279 FILE *fin, *dout; 280 struct stat st; 281 int (*closefunc)(), tmp; 282 283 if (cmd == 0) { 284 #ifdef notdef 285 /* no remote command execution -- it's a security hole */ 286 if (*name == '|') 287 fin = popen(name + 1, "r"), closefunc = pclose; 288 else 289 #endif 290 fin = fopen(name, "r"), closefunc = fclose; 291 } else { 292 char line[BUFSIZ]; 293 294 sprintf(line, cmd, name), name = line; 295 fin = popen(line, "r"), closefunc = pclose; 296 } 297 if (fin == NULL) { 298 if (errno != 0) 299 reply(550, "%s: %s.", name, sys_errlist[errno]); 300 return; 301 } 302 st.st_size = 0; 303 if (cmd == 0 && 304 (stat(name, &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { 305 reply(550, "%s: not a plain file.", name); 306 goto done; 307 } 308 dout = dataconn(name, st.st_size, "w"); 309 if (dout == NULL) 310 goto done; 311 if ((tmp = send_data(fin, dout)) > 0 || ferror(dout) > 0) { 312 reply(550, "%s: %s.", name, sys_errlist[errno]); 313 } 314 else if (tmp == 0) { 315 reply(226, "Transfer complete."); 316 } 317 fclose(dout); 318 data = -1; 319 pdata = -1; 320 done: 321 (*closefunc)(fin); 322 } 323 324 store(name, mode) 325 char *name, *mode; 326 { 327 FILE *fout, *din; 328 int (*closefunc)(), dochown = 0, tmp; 329 char *gunique(), *local; 330 331 #ifdef notdef 332 /* no remote command execution -- it's a security hole */ 333 if (name[0] == '|') 334 fout = popen(&name[1], "w"), closefunc = pclose; 335 else 336 #endif 337 { 338 struct stat st; 339 340 local = name; 341 if (stat(name, &st) < 0) { 342 dochown++; 343 } 344 else if (unique) { 345 if ((local = gunique(name)) == NULL) { 346 return; 347 } 348 dochown++; 349 } 350 fout = fopen(local, mode), closefunc = fclose; 351 } 352 if (fout == NULL) { 353 reply(550, "%s: %s.", local, sys_errlist[errno]); 354 return; 355 } 356 din = dataconn(local, (off_t)-1, "r"); 357 if (din == NULL) 358 goto done; 359 if ((tmp = receive_data(din, fout)) > 0 || ferror(fout) > 0) { 360 reply(550, "%s: %s.", local, sys_errlist[errno]); 361 } 362 else if (tmp == 0 && !unique) { 363 reply(226, "Transfer complete."); 364 } 365 else if (tmp == 0 && unique) { 366 reply(226, "Transfer complete (unique file name:%s).", local); 367 } 368 fclose(din); 369 data = -1; 370 pdata = -1; 371 done: 372 if (dochown) 373 (void) chown(local, pw->pw_uid, -1); 374 (*closefunc)(fout); 375 } 376 377 FILE * 378 getdatasock(mode) 379 char *mode; 380 { 381 int s, on = 1; 382 383 if (data >= 0) 384 return (fdopen(data, mode)); 385 s = socket(AF_INET, SOCK_STREAM, 0); 386 if (s < 0) 387 return (NULL); 388 seteuid(0); 389 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0) 390 goto bad; 391 /* anchor socket to avoid multi-homing problems */ 392 data_source.sin_family = AF_INET; 393 data_source.sin_addr = ctrl_addr.sin_addr; 394 if (bind(s, &data_source, sizeof (data_source), 0) < 0) 395 goto bad; 396 seteuid(pw->pw_uid); 397 return (fdopen(s, mode)); 398 bad: 399 seteuid(pw->pw_uid); 400 close(s); 401 return (NULL); 402 } 403 404 FILE * 405 dataconn(name, size, mode) 406 char *name; 407 off_t size; 408 char *mode; 409 { 410 char sizebuf[32]; 411 FILE *file; 412 int retry = 0; 413 414 if (size >= 0) 415 sprintf (sizebuf, " (%ld bytes)", size); 416 else 417 (void) strcpy(sizebuf, ""); 418 if (pdata > 0) { 419 struct sockaddr_in from; 420 int s, fromlen = sizeof(from); 421 422 s = accept(pdata, &from, &fromlen, 0); 423 if (s < 0) { 424 reply(425, "Can't open data connection."); 425 (void) close(pdata); 426 pdata = -1; 427 return(NULL); 428 } 429 (void) close(pdata); 430 pdata = s; 431 reply(150, "Openning data connection for %s (%s,%d)%s.", 432 name, inet_ntoa(from.sin_addr.s_addr), 433 ntohs(from.sin_port), sizebuf); 434 return(fdopen(pdata, mode)); 435 } 436 if (data >= 0) { 437 reply(125, "Using existing data connection for %s%s.", 438 name, sizebuf); 439 usedefault = 1; 440 return (fdopen(data, mode)); 441 } 442 if (usedefault) 443 data_dest = his_addr; 444 usedefault = 1; 445 file = getdatasock(mode); 446 if (file == NULL) { 447 reply(425, "Can't create data socket (%s,%d): %s.", 448 inet_ntoa(data_source.sin_addr), 449 ntohs(data_source.sin_port), 450 sys_errlist[errno]); 451 return (NULL); 452 } 453 reply(150, "Opening data connection for %s (%s,%d)%s.", 454 name, inet_ntoa(data_dest.sin_addr.s_addr), 455 ntohs(data_dest.sin_port), sizebuf); 456 data = fileno(file); 457 while (connect(data, &data_dest, sizeof (data_dest)) < 0) { 458 if (errno == EADDRINUSE && retry < swaitmax) { 459 sleep(swaitint); 460 retry += swaitint; 461 continue; 462 } 463 reply(425, "Can't build data connection: %s.", 464 sys_errlist[errno]); 465 (void) fclose(file); 466 data = -1; 467 return (NULL); 468 } 469 return (file); 470 } 471 472 /* 473 * Tranfer the contents of "instr" to 474 * "outstr" peer using the appropriate 475 * encapulation of the date subject 476 * to Mode, Structure, and Type. 477 * 478 * NB: Form isn't handled. 479 */ 480 send_data(instr, outstr) 481 FILE *instr, *outstr; 482 { 483 register int c; 484 int netfd, filefd, cnt; 485 char buf[BUFSIZ]; 486 487 transflag++; 488 if (setjmp(urgcatch)) { 489 transflag = 0; 490 return(-1); 491 } 492 switch (type) { 493 494 case TYPE_A: 495 while ((c = getc(instr)) != EOF) { 496 if (c == '\n') { 497 if (ferror (outstr)) { 498 transflag = 0; 499 return (1); 500 } 501 putc('\r', outstr); 502 } 503 putc(c, outstr); 504 /* if (c == '\r') */ 505 /* putc ('\0', outstr); */ 506 } 507 transflag = 0; 508 if (ferror (instr) || ferror (outstr)) { 509 return (1); 510 } 511 return (0); 512 513 case TYPE_I: 514 case TYPE_L: 515 netfd = fileno(outstr); 516 filefd = fileno(instr); 517 518 while ((cnt = read(filefd, buf, sizeof (buf))) > 0) { 519 if (write(netfd, buf, cnt) < 0) { 520 transflag = 0; 521 return (1); 522 } 523 } 524 transflag = 0; 525 return (cnt < 0); 526 } 527 reply(504,"Unimplemented TYPE %d in send_data", type); 528 transflag = 0; 529 return (1); 530 } 531 532 /* 533 * Transfer data from peer to 534 * "outstr" using the appropriate 535 * encapulation of the data subject 536 * to Mode, Structure, and Type. 537 * 538 * N.B.: Form isn't handled. 539 */ 540 receive_data(instr, outstr) 541 FILE *instr, *outstr; 542 { 543 register int c; 544 int cnt; 545 char buf[BUFSIZ]; 546 547 548 transflag++; 549 if (setjmp(urgcatch)) { 550 transflag = 0; 551 return(-1); 552 } 553 switch (type) { 554 555 case TYPE_I: 556 case TYPE_L: 557 while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) { 558 if (write(fileno(outstr), buf, cnt) < 0) { 559 transflag = 0; 560 return (1); 561 } 562 } 563 transflag = 0; 564 return (cnt < 0); 565 566 case TYPE_E: 567 reply(504, "TYPE E not implemented."); 568 transflag = 0; 569 return (1); 570 571 case TYPE_A: 572 while ((c = getc(instr)) != EOF) { 573 if (c == '\r') { 574 if (ferror (outstr)) { 575 transflag = 0; 576 return (1); 577 } 578 if ((c = getc(instr)) != '\n') 579 putc ('\r', outstr); 580 /* if (c == '\0') */ 581 /* continue; */ 582 } 583 putc (c, outstr); 584 } 585 transflag = 0; 586 if (ferror (instr) || ferror (outstr)) 587 return (1); 588 return (0); 589 } 590 transflag = 0; 591 fatal("Unknown type in receive_data."); 592 /*NOTREACHED*/ 593 } 594 595 fatal(s) 596 char *s; 597 { 598 reply(451, "Error in server: %s\n", s); 599 reply(221, "Closing connection due to server error."); 600 dologout(0); 601 } 602 603 reply(n, s, args) 604 int n; 605 char *s; 606 { 607 608 printf("%d ", n); 609 _doprnt(s, &args, stdout); 610 printf("\r\n"); 611 fflush(stdout); 612 if (debug) { 613 fprintf(stderr, "<--- %d ", n); 614 _doprnt(s, &args, stderr); 615 fprintf(stderr, "\n"); 616 fflush(stderr); 617 } 618 } 619 620 lreply(n, s, args) 621 int n; 622 char *s; 623 { 624 printf("%d-", n); 625 _doprnt(s, &args, stdout); 626 printf("\r\n"); 627 fflush(stdout); 628 if (debug) { 629 fprintf(stderr, "<--- %d-", n); 630 _doprnt(s, &args, stderr); 631 fprintf(stderr, "\n"); 632 } 633 } 634 635 replystr(s) 636 char *s; 637 { 638 printf("%s\r\n", s); 639 fflush(stdout); 640 if (debug) 641 fprintf(stderr, "<--- %s\n", s); 642 } 643 644 ack(s) 645 char *s; 646 { 647 reply(200, "%s command successful.", s); 648 } 649 650 nack(s) 651 char *s; 652 { 653 reply(502, "%s command not implemented.", s); 654 } 655 656 yyerror() 657 { 658 char *cp; 659 660 cp = index(cbuf,'\n'); 661 *cp = '\0'; 662 reply(500, "'%s': command not understood.",cbuf); 663 } 664 665 delete(name) 666 char *name; 667 { 668 struct stat st; 669 670 if (stat(name, &st) < 0) { 671 reply(550, "%s: %s.", name, sys_errlist[errno]); 672 return; 673 } 674 if ((st.st_mode&S_IFMT) == S_IFDIR) { 675 if (rmdir(name) < 0) { 676 reply(550, "%s: %s.", name, sys_errlist[errno]); 677 return; 678 } 679 goto done; 680 } 681 if (unlink(name) < 0) { 682 reply(550, "%s: %s.", name, sys_errlist[errno]); 683 return; 684 } 685 done: 686 ack("DELE"); 687 } 688 689 cwd(path) 690 char *path; 691 { 692 693 if (chdir(path) < 0) { 694 reply(550, "%s: %s.", path, sys_errlist[errno]); 695 return; 696 } 697 ack("CWD"); 698 } 699 700 makedir(name) 701 char *name; 702 { 703 struct stat st; 704 int dochown = stat(name, &st) < 0; 705 706 if (mkdir(name, 0777) < 0) { 707 reply(550, "%s: %s.", name, sys_errlist[errno]); 708 return; 709 } 710 if (dochown) 711 (void) chown(name, pw->pw_uid, -1); 712 ack("MKDIR"); 713 } 714 715 removedir(name) 716 char *name; 717 { 718 719 if (rmdir(name) < 0) { 720 reply(550, "%s: %s.", name, sys_errlist[errno]); 721 return; 722 } 723 ack("RMDIR"); 724 } 725 726 pwd() 727 { 728 char path[MAXPATHLEN + 1]; 729 730 if (getwd(path) == NULL) { 731 reply(451, "%s.", path); 732 return; 733 } 734 reply(251, "\"%s\" is current directory.", path); 735 } 736 737 char * 738 renamefrom(name) 739 char *name; 740 { 741 struct stat st; 742 743 if (stat(name, &st) < 0) { 744 reply(550, "%s: %s.", name, sys_errlist[errno]); 745 return ((char *)0); 746 } 747 reply(350, "File exists, ready for destination name"); 748 return (name); 749 } 750 751 renamecmd(from, to) 752 char *from, *to; 753 { 754 755 if (rename(from, to) < 0) { 756 reply(550, "rename: %s.", sys_errlist[errno]); 757 return; 758 } 759 ack("RNTO"); 760 } 761 762 dolog(sin) 763 struct sockaddr_in *sin; 764 { 765 struct hostent *hp = gethostbyaddr(&sin->sin_addr, 766 sizeof (struct in_addr), AF_INET); 767 time_t t; 768 769 if (hp) { 770 strncpy(remotehost, hp->h_name, sizeof (remotehost)); 771 endhostent(); 772 } else 773 strncpy(remotehost, inet_ntoa(sin->sin_addr), 774 sizeof (remotehost)); 775 if (!logging) 776 return; 777 t = time(0); 778 fprintf(stderr,"FTPD: connection from %s at %s", remotehost, ctime(&t)); 779 fflush(stderr); 780 } 781 782 #include <utmp.h> 783 784 #define SCPYN(a, b) strncpy(a, b, sizeof (a)) 785 struct utmp utmp; 786 787 /* 788 * Record login in wtmp file. 789 */ 790 dologin(pw) 791 struct passwd *pw; 792 { 793 char line[32]; 794 795 if (wtmp >= 0) { 796 /* hack, but must be unique and no tty line */ 797 sprintf(line, "ftp%d", getpid()); 798 SCPYN(utmp.ut_line, line); 799 SCPYN(utmp.ut_name, pw->pw_name); 800 SCPYN(utmp.ut_host, remotehost); 801 utmp.ut_time = time(0); 802 (void) write(wtmp, (char *)&utmp, sizeof (utmp)); 803 if (!guest) { /* anon must hang on */ 804 (void) close(wtmp); 805 wtmp = -1; 806 } 807 } 808 } 809 810 /* 811 * Record logout in wtmp file 812 * and exit with supplied status. 813 */ 814 dologout(status) 815 int status; 816 { 817 818 if (logged_in) { 819 (void) seteuid(0); 820 if (wtmp < 0) 821 wtmp = open("/usr/adm/wtmp", O_WRONLY|O_APPEND); 822 if (wtmp >= 0) { 823 SCPYN(utmp.ut_name, ""); 824 SCPYN(utmp.ut_host, ""); 825 utmp.ut_time = time(0); 826 (void) write(wtmp, (char *)&utmp, sizeof (utmp)); 827 (void) close(wtmp); 828 } 829 } 830 /* beware of flushing buffers after a SIGPIPE */ 831 _exit(status); 832 } 833 834 /* 835 * Special version of popen which avoids 836 * call to shell. This insures noone may 837 * create a pipe to a hidden program as a side 838 * effect of a list or dir command. 839 */ 840 #define tst(a,b) (*mode == 'r'? (b) : (a)) 841 #define RDR 0 842 #define WTR 1 843 static int popen_pid[5]; 844 845 static char * 846 nextarg(cpp) 847 char *cpp; 848 { 849 register char *cp = cpp; 850 851 if (cp == 0) 852 return (cp); 853 while (*cp && *cp != ' ' && *cp != '\t') 854 cp++; 855 if (*cp == ' ' || *cp == '\t') { 856 *cp++ = '\0'; 857 while (*cp == ' ' || *cp == '\t') 858 cp++; 859 } 860 if (cp == cpp) 861 return ((char *)0); 862 return (cp); 863 } 864 865 FILE * 866 popen(cmd, mode) 867 char *cmd, *mode; 868 { 869 int p[2], ac, gac; 870 register myside, hisside, pid; 871 char *av[20], *gav[512]; 872 register char *cp; 873 874 if (pipe(p) < 0) 875 return (NULL); 876 cp = cmd, ac = 0; 877 /* break up string into pieces */ 878 do { 879 av[ac++] = cp; 880 cp = nextarg(cp); 881 } while (cp && *cp && ac < 20); 882 av[ac] = (char *)0; 883 gav[0] = av[0]; 884 /* glob each piece */ 885 for (gac = ac = 1; av[ac] != NULL; ac++) { 886 char **pop; 887 extern char **glob(), **copyblk(); 888 889 pop = glob(av[ac]); 890 if (pop == (char **)NULL) { /* globbing failed */ 891 char *vv[2]; 892 893 vv[0] = av[ac]; 894 vv[1] = 0; 895 pop = copyblk(vv); 896 } 897 av[ac] = (char *)pop; /* save to free later */ 898 while (*pop && gac < 512) 899 gav[gac++] = *pop++; 900 } 901 gav[gac] = (char *)0; 902 myside = tst(p[WTR], p[RDR]); 903 hisside = tst(p[RDR], p[WTR]); 904 if ((pid = fork()) == 0) { 905 /* myside and hisside reverse roles in child */ 906 close(myside); 907 dup2(hisside, tst(0, 1)); 908 close(hisside); 909 execv(gav[0], gav); 910 _exit(1); 911 } 912 for (ac = 1; av[ac] != NULL; ac++) 913 blkfree((char **)av[ac]); 914 if (pid == -1) 915 return (NULL); 916 popen_pid[myside] = pid; 917 close(hisside); 918 return (fdopen(myside, mode)); 919 } 920 921 pclose(ptr) 922 FILE *ptr; 923 { 924 register f, r, (*hstat)(), (*istat)(), (*qstat)(); 925 int status; 926 927 f = fileno(ptr); 928 fclose(ptr); 929 istat = signal(SIGINT, SIG_IGN); 930 qstat = signal(SIGQUIT, SIG_IGN); 931 hstat = signal(SIGHUP, SIG_IGN); 932 while ((r = wait(&status)) != popen_pid[f] && r != -1) 933 ; 934 if (r == -1) 935 status = -1; 936 signal(SIGINT, istat); 937 signal(SIGQUIT, qstat); 938 signal(SIGHUP, hstat); 939 return (status); 940 } 941 942 /* 943 * Check user requesting login priviledges. 944 * Disallow anyone mentioned in the file FTPUSERS 945 * to allow people such as uucp to be avoided. 946 */ 947 checkuser(name) 948 register char *name; 949 { 950 char line[BUFSIZ], *index(); 951 FILE *fd; 952 int found = 0; 953 954 fd = fopen(FTPUSERS, "r"); 955 if (fd == NULL) 956 return (1); 957 while (fgets(line, sizeof (line), fd) != NULL) { 958 register char *cp = index(line, '\n'); 959 960 if (cp) 961 *cp = '\0'; 962 if (strcmp(line, name) == 0) { 963 found++; 964 break; 965 } 966 } 967 fclose(fd); 968 return (!found); 969 } 970 971 myoob() 972 { 973 char mark, *cp; 974 int aflag = 0, count = 0, iacflag = 0, c; 975 976 if (!transflag) { 977 for (;;) { 978 if (ioctl(fileno(stdin), SIOCATMARK, &mark) < 0) { 979 perror("ioctl"); 980 break; 981 } 982 if (mark) { 983 break; 984 } 985 read(fileno(stdin), &mark, 1); 986 c = 0377 & mark; 987 } 988 recv(fileno(stdin), &mark, 1, MSG_OOB); 989 c = 0377 & mark; 990 read(fileno(stdin), &mark, 1); 991 return; 992 } 993 for (;;) { 994 if (ioctl(fileno(stdin), SIOCATMARK, &mark) < 0) { 995 perror("ioctl"); 996 break; 997 } 998 if (mark) { 999 break; 1000 } 1001 read(fileno(stdin), &mark, 1); 1002 c = 0377 & mark; 1003 if (c == IAC) { 1004 aflag++; 1005 } 1006 else if (c == IP) { 1007 aflag++; 1008 } 1009 } 1010 recv(fileno(stdin), &mark, 1, MSG_OOB); 1011 c = 0377 & mark; 1012 if (c == IAC) { 1013 aflag++; 1014 } 1015 read(fileno(stdin), &mark, 1); 1016 c = 0377 & mark; 1017 if (c == DM) { 1018 aflag++; 1019 } 1020 if (aflag != 4) { 1021 return; 1022 } 1023 cp = tmpline; 1024 (void) getline(cp, 7, stdin); 1025 upper(cp); 1026 if (strcmp(cp, "ABOR\r\n")) { 1027 return; 1028 } 1029 tmpline[0] = '\0'; 1030 reply(426,"Transfer aborted. Data connection closed."); 1031 reply(226,"Abort successful"); 1032 longjmp(urgcatch, 1); 1033 } 1034 1035 passive() 1036 { 1037 int len; 1038 struct sockaddr_in tmp; 1039 register char *p, *a; 1040 1041 pdata = socket(AF_INET, SOCK_STREAM, 0); 1042 if (pdata < 0) { 1043 reply(451, "Can't open passive connection"); 1044 return; 1045 } 1046 tmp = ctrl_addr; 1047 tmp.sin_port = 0; 1048 seteuid(0); 1049 if (bind(pdata, (char *) &tmp, sizeof(tmp), 0) < 0) { 1050 seteuid(pw->pw_uid); 1051 (void) close(pdata); 1052 pdata = -1; 1053 reply(451, "Can't open passive connection"); 1054 return; 1055 } 1056 seteuid(pw->pw_uid); 1057 len = sizeof(tmp); 1058 if (getsockname(pdata, (char *) &tmp, &len) < 0) { 1059 (void) close(pdata); 1060 pdata = -1; 1061 reply(451, "Can't open passive connection"); 1062 return; 1063 } 1064 if (listen(pdata, 1) < 0) { 1065 (void) close(pdata); 1066 pdata = -1; 1067 reply(451, "Can't open passive connection"); 1068 return; 1069 } 1070 a = (char *) &tmp.sin_addr; 1071 p = (char *) &tmp.sin_port; 1072 1073 #define UC(b) (((int) b) & 0xff) 1074 1075 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1076 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1077 } 1078 1079 char * 1080 gunique(local) 1081 char *local; 1082 { 1083 static char new[MAXPATHLEN]; 1084 char *cp = rindex(local, '/'); 1085 int d, count=0; 1086 char ext = '1'; 1087 1088 if (cp) { 1089 *cp = '\0'; 1090 } 1091 d = access(cp ? local : ".", 2); 1092 if (cp) { 1093 *cp = '/'; 1094 } 1095 if (d < 0) { 1096 perror(local); 1097 return((char *) 0); 1098 } 1099 (void) strcpy(new, local); 1100 cp = new + strlen(new); 1101 *cp++ = '.'; 1102 while (!d) { 1103 if (++count == 100) { 1104 reply(451, "Unique file name not cannot be created."); 1105 return((char *) 0); 1106 } 1107 *cp++ = ext; 1108 *cp = '\0'; 1109 if (ext == '9') { 1110 ext = '0'; 1111 } 1112 else { 1113 ext++; 1114 } 1115 if ((d = access(new, 0)) < 0) { 1116 break; 1117 } 1118 if (ext != '0') { 1119 cp--; 1120 } 1121 else if (*(cp - 2) == '.') { 1122 *(cp - 1) = '1'; 1123 } 1124 else { 1125 *(cp - 2) = *(cp - 2) + 1; 1126 cp--; 1127 } 1128 } 1129 return(new); 1130 } 1131