ftpd.c revision 1.36
1 /* $NetBSD: ftpd.c,v 1.36 1997/10/12 13:18:56 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 46 #else 47 __RCSID("$NetBSD: ftpd.c,v 1.36 1997/10/12 13:18:56 mycroft Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/socket.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 64 #define FTP_NAMES 65 #include <arpa/ftp.h> 66 #include <arpa/inet.h> 67 #include <arpa/telnet.h> 68 69 #include <ctype.h> 70 #include <dirent.h> 71 #include <err.h> 72 #include <errno.h> 73 #include <fcntl.h> 74 #include <fnmatch.h> 75 #include <glob.h> 76 #include <limits.h> 77 #include <netdb.h> 78 #include <pwd.h> 79 #include <setjmp.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <syslog.h> 85 #include <time.h> 86 #include <unistd.h> 87 #ifdef SKEY 88 #include <skey.h> 89 #endif 90 91 #include "extern.h" 92 #include "pathnames.h" 93 94 #if __STDC__ 95 #include <stdarg.h> 96 #else 97 #include <varargs.h> 98 #endif 99 100 static char version[] = "Version 7.01"; 101 102 extern off_t restart_point; 103 extern char cbuf[]; 104 extern int yyparse __P((void)); 105 106 struct sockaddr_in ctrl_addr; 107 struct sockaddr_in data_source; 108 struct sockaddr_in data_dest; 109 struct sockaddr_in his_addr; 110 struct sockaddr_in pasv_addr; 111 112 int data; 113 jmp_buf errcatch, urgcatch; 114 int logged_in; 115 struct passwd *pw; 116 int debug; 117 int logging; 118 int guest; 119 int dochroot; 120 int type; 121 int form; 122 int stru; /* avoid C keyword */ 123 int mode; 124 int usedefault = 1; /* for data transfers */ 125 int pdata = -1; /* for passive mode */ 126 sig_atomic_t transflag; 127 off_t file_size; 128 off_t byte_count; 129 char tmpline[7]; 130 char hostname[MAXHOSTNAMELEN]; 131 char remotehost[MAXHOSTNAMELEN]; 132 static char ttyline[20]; 133 char *tty = ttyline; /* for klogin */ 134 static char *anondir = NULL; 135 static char confdir[MAXPATHLEN]; 136 137 extern struct ftpclass curclass; 138 139 #ifdef KERBEROS 140 int notickets = 1; 141 char *krbtkfile_env = NULL; 142 #endif 143 144 /* 145 * Timeout intervals for retrying connections 146 * to hosts that don't accept PORT cmds. This 147 * is a kludge, but given the problems with TCP... 148 */ 149 #define SWAITMAX 90 /* wait at most 90 seconds */ 150 #define SWAITINT 5 /* interval between retries */ 151 152 int swaitmax = SWAITMAX; 153 int swaitint = SWAITINT; 154 155 #ifdef HASSETPROCTITLE 156 char proctitle[BUFSIZ]; /* initial part of title */ 157 #endif /* HASSETPROCTITLE */ 158 159 #define LOGCMD(cmd, file) \ 160 if (logging > 1) \ 161 syslog(LOG_INFO,"%s %s%s", cmd, \ 162 *(file) == '/' ? "" : curdir(), file); 163 #define LOGCMD2(cmd, file1, file2) \ 164 if (logging > 1) \ 165 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 166 *(file1) == '/' ? "" : curdir(), file1, \ 167 *(file2) == '/' ? "" : curdir(), file2); 168 #define LOGBYTES(cmd, file, cnt) \ 169 if (logging > 1) { \ 170 if (cnt == (off_t)-1) \ 171 syslog(LOG_INFO,"%s %s%s", cmd, \ 172 *(file) == '/' ? "" : curdir(), file); \ 173 else \ 174 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 175 cmd, (*(file) == '/') ? "" : curdir(), file, \ 176 (long long)cnt); \ 177 } 178 179 static void ack __P((char *)); 180 static void myoob __P((int)); 181 static int checkuser __P((char *, char *)); 182 static int checkaccess __P((char *)); 183 static FILE *dataconn __P((char *, off_t, char *)); 184 static void dolog __P((struct sockaddr_in *)); 185 static char *curdir __P((void)); 186 static void end_login __P((void)); 187 static FILE *getdatasock __P((char *)); 188 static char *gunique __P((char *)); 189 static void lostconn __P((int)); 190 static int receive_data __P((FILE *, FILE *)); 191 static void replydirname __P((const char *, const char *)); 192 static void send_data __P((FILE *, FILE *, off_t)); 193 static struct passwd * 194 sgetpwnam __P((char *)); 195 static char *sgetsave __P((char *)); 196 197 int main __P((int, char *[], char **)); 198 199 #if defined (KERBEROS) 200 int klogin __P((struct passwd *, char *, char *, char *)); 201 #endif 202 203 static char * 204 curdir() 205 { 206 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 207 208 if (getcwd(path, sizeof(path)-2) == NULL) 209 return (""); 210 if (path[1] != '\0') /* special case for root dir. */ 211 strcat(path, "/"); 212 /* For guest account, skip / since it's chrooted */ 213 return (guest ? path+1 : path); 214 } 215 216 int 217 main(argc, argv, envp) 218 int argc; 219 char *argv[]; 220 char **envp; 221 { 222 int addrlen, ch, on = 1, tos; 223 char *cp, line[LINE_MAX]; 224 FILE *fd; 225 226 debug = 0; 227 logging = 0; 228 (void)strcpy(confdir, _DEFAULT_CONFDIR); 229 230 while ((ch = getopt(argc, argv, "a:c:C:dlt:T:u:v")) != -1) { 231 switch (ch) { 232 case 'a': 233 anondir = optarg; 234 break; 235 236 case 'c': 237 (void)strncpy(confdir, optarg, sizeof(confdir)); 238 confdir[sizeof(confdir)-1] = '\0'; 239 break; 240 241 case 'C': 242 exit(checkaccess(optarg)); 243 /* NOTREACHED */ 244 245 case 'd': 246 case 'v': /* deprecated */ 247 debug = 1; 248 break; 249 250 case 'l': 251 logging++; /* > 1 == extra logging */ 252 break; 253 254 case 't': 255 case 'T': 256 case 'u': 257 warnx("-%c has been deprecated in favour of ftpd.conf", 258 ch); 259 break; 260 261 default: 262 if (optopt == 'a' || optopt == 'C') 263 exit(1); 264 warnx("unknown flag -%c ignored", optopt); 265 break; 266 } 267 } 268 269 /* 270 * LOG_NDELAY sets up the logging connection immediately, 271 * necessary for anonymous ftp's that chroot and can't do it later. 272 */ 273 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 274 addrlen = sizeof(his_addr); 275 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 276 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 277 exit(1); 278 } 279 addrlen = sizeof(ctrl_addr); 280 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 281 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 282 exit(1); 283 } 284 #ifdef IP_TOS 285 tos = IPTOS_LOWDELAY; 286 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 287 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 288 #endif 289 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 290 291 /* set this here so klogin can use it... */ 292 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 293 294 (void) freopen(_PATH_DEVNULL, "w", stderr); 295 (void) signal(SIGPIPE, lostconn); 296 (void) signal(SIGCHLD, SIG_IGN); 297 if ((long)signal(SIGURG, myoob) < 0) 298 syslog(LOG_ERR, "signal: %m"); 299 300 /* Try to handle urgent data inline */ 301 #ifdef SO_OOBINLINE 302 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 303 syslog(LOG_ERR, "setsockopt: %m"); 304 #endif 305 306 #ifdef F_SETOWN 307 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 308 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 309 #endif 310 dolog(&his_addr); 311 /* 312 * Set up default state 313 */ 314 data = -1; 315 type = TYPE_A; 316 form = FORM_N; 317 stru = STRU_F; 318 mode = MODE_S; 319 tmpline[0] = '\0'; 320 321 /* If logins are disabled, print out the message. */ 322 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 323 while (fgets(line, sizeof(line), fd) != NULL) { 324 if ((cp = strchr(line, '\n')) != NULL) 325 *cp = '\0'; 326 lreply(530, "%s", line); 327 } 328 (void) fflush(stdout); 329 (void) fclose(fd); 330 reply(530, "System not available."); 331 exit(0); 332 } 333 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 334 while (fgets(line, sizeof(line), fd) != NULL) { 335 if ((cp = strchr(line, '\n')) != NULL) 336 *cp = '\0'; 337 lreply(220, "%s", line); 338 } 339 (void) fflush(stdout); 340 (void) fclose(fd); 341 /* reply(220,) must follow */ 342 } 343 (void) gethostname(hostname, sizeof(hostname)); 344 reply(220, "%s FTP server (%s) ready.", hostname, version); 345 (void) setjmp(errcatch); 346 for (;;) 347 (void) yyparse(); 348 /* NOTREACHED */ 349 } 350 351 static void 352 lostconn(signo) 353 int signo; 354 { 355 356 if (debug) 357 syslog(LOG_DEBUG, "lost connection"); 358 dologout(1); 359 } 360 361 /* 362 * Helper function for sgetpwnam(). 363 */ 364 static char * 365 sgetsave(s) 366 char *s; 367 { 368 char *new = malloc((unsigned) strlen(s) + 1); 369 370 if (new == NULL) { 371 perror_reply(421, "Local resource failure: malloc"); 372 dologout(1); 373 /* NOTREACHED */ 374 } 375 (void) strcpy(new, s); 376 return (new); 377 } 378 379 /* 380 * Save the result of a getpwnam. Used for USER command, since 381 * the data returned must not be clobbered by any other command 382 * (e.g., globbing). 383 */ 384 static struct passwd * 385 sgetpwnam(name) 386 char *name; 387 { 388 static struct passwd save; 389 struct passwd *p; 390 391 if ((p = getpwnam(name)) == NULL) 392 return (p); 393 if (save.pw_name) { 394 free(save.pw_name); 395 free(save.pw_passwd); 396 free(save.pw_gecos); 397 free(save.pw_dir); 398 free(save.pw_shell); 399 } 400 save = *p; 401 save.pw_name = sgetsave(p->pw_name); 402 save.pw_passwd = sgetsave(p->pw_passwd); 403 save.pw_gecos = sgetsave(p->pw_gecos); 404 save.pw_dir = sgetsave(p->pw_dir); 405 save.pw_shell = sgetsave(p->pw_shell); 406 return (&save); 407 } 408 409 static int login_attempts; /* number of failed login attempts */ 410 static int askpasswd; /* had user command, ask for passwd */ 411 static char curname[10]; /* current USER name */ 412 413 /* 414 * USER command. 415 * Sets global passwd pointer pw if named account exists and is acceptable; 416 * sets askpasswd if a PASS command is expected. If logged in previously, 417 * need to reset state. If name is "ftp" or "anonymous", the name is not in 418 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 419 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 420 * requesting login privileges. Disallow anyone who does not have a standard 421 * shell as returned by getusershell(). Disallow anyone mentioned in the file 422 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 423 */ 424 void 425 user(name) 426 char *name; 427 { 428 if (logged_in) { 429 if (guest) { 430 reply(530, "Can't change user from guest login."); 431 return; 432 } else if (dochroot) { 433 reply(530, "Can't change user from chroot user."); 434 return; 435 } 436 end_login(); 437 } 438 439 guest = 0; 440 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 441 if (checkaccess("ftp") || checkaccess("anonymous")) 442 reply(530, "User %s access denied.", name); 443 else if ((pw = sgetpwnam("ftp")) != NULL) { 444 guest = 1; 445 askpasswd = 1; 446 reply(331, 447 "Guest login ok, type your name as password."); 448 } else 449 reply(530, "User %s unknown.", name); 450 if (!askpasswd && logging) 451 syslog(LOG_NOTICE, 452 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 453 return; 454 } 455 456 pw = sgetpwnam(name); 457 if (logging) 458 strncpy(curname, name, sizeof(curname)-1); 459 460 #ifdef SKEY 461 if (skey_haskey(name) == 0) { 462 char *myskey; 463 464 myskey = skey_keyinfo(name); 465 reply(331, "Password [%s] required for %s.", 466 myskey ? myskey : "error getting challenge", name); 467 } else 468 #endif 469 reply(331, "Password required for %s.", name); 470 471 askpasswd = 1; 472 /* 473 * Delay before reading passwd after first failed 474 * attempt to slow down passwd-guessing programs. 475 */ 476 if (login_attempts) 477 sleep((unsigned) login_attempts); 478 } 479 480 /* 481 * Check if a user is in the file "fname" 482 */ 483 static int 484 checkuser(fname, name) 485 char *fname; 486 char *name; 487 { 488 FILE *fd; 489 int found = 0; 490 char *p, line[BUFSIZ]; 491 492 if ((fd = fopen(fname, "r")) != NULL) { 493 while (fgets(line, sizeof(line), fd) != NULL) 494 if ((p = strchr(line, '\n')) != NULL) { 495 *p = '\0'; 496 if (line[0] == '#') 497 continue; 498 if (strcmp(line, name) == 0) { 499 found = 1; 500 break; 501 } 502 } 503 (void) fclose(fd); 504 } 505 return (found); 506 } 507 508 /* 509 * Determine whether a user has access, based on information in 510 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 511 * `allow' or `deny' (with deny being the default if anything but 512 * `allow', or nothing at all, is specified). 513 * 514 * Each glob is matched against the username in turn, and the first 515 * match found is used. If no match is found, access is allowed. 516 * 517 * Any line starting with `#' is considered a comment and ignored. 518 * 519 * This is probably not the best way to do this, but it preserves 520 * the old semantics where if a user was listed in the file he was 521 * denied, otherwise he was allowed. 522 * 523 * There is one change in the semantics, however; ftpd will now `fail 524 * safe' and deny all access if there's no /etc/ftpusers file. 525 * 526 * Return 1 if the user is denied, or 0 if he is allowed. 527 */ 528 static int 529 checkaccess(name) 530 char *name; 531 { 532 #define ALLOWED 0 533 #define NOT_ALLOWED 1 534 FILE *fd; 535 int retval = ALLOWED; 536 char *glob, *perm, line[BUFSIZ]; 537 538 if ((fd = fopen(conffilename(_PATH_FTPUSERS), "r")) == NULL) 539 return NOT_ALLOWED; 540 541 while (fgets(line, sizeof(line), fd) != NULL) { 542 glob = strtok(line, " \t\n"); 543 if (glob[0] == '#') 544 continue; 545 perm = strtok(NULL, " \t\n"); 546 if (fnmatch(glob, name, 0) == 0) { 547 if (perm != NULL && strcmp(perm, "allow") == 0) 548 retval = ALLOWED; 549 else 550 retval = NOT_ALLOWED; 551 break; 552 } 553 } 554 (void) fclose(fd); 555 return (retval); 556 } 557 #undef ALLOWED 558 #undef NOT_ALLOWED 559 560 /* 561 * Terminate login as previous user, if any, resetting state; 562 * used when USER command is given or login fails. 563 */ 564 static void 565 end_login() 566 { 567 568 (void) seteuid((uid_t)0); 569 if (logged_in) 570 logwtmp(ttyline, "", ""); 571 pw = NULL; 572 logged_in = 0; 573 guest = 0; 574 dochroot = 0; 575 } 576 577 void 578 pass(passwd) 579 char *passwd; 580 { 581 int rval; 582 FILE *fd; 583 char *cp, *shell; 584 585 if (logged_in || askpasswd == 0) { 586 reply(503, "Login with USER first."); 587 return; 588 } 589 askpasswd = 0; 590 if (!guest) { /* "ftp" is only account allowed no password */ 591 if (pw == NULL) { 592 rval = 1; /* failure below */ 593 goto skip; 594 } 595 #ifdef SKEY 596 if (skey_haskey(pw->pw_name) == 0 && 597 skey_passcheck(pw->pw_name, passwd) != -1) { 598 rval = 0; 599 goto skip; 600 } 601 #endif 602 #ifdef KERBEROS 603 if (klogin(pw, "", hostname, passwd) == 0) { 604 rval = 0; 605 goto skip; 606 } 607 #endif 608 /* the strcmp does not catch null passwords! */ 609 if (pw == NULL || *pw->pw_passwd == '\0' || 610 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 611 rval = 1; /* failure */ 612 goto skip; 613 } 614 rval = 0; 615 616 skip: 617 /* 618 * If rval == 1, the user failed the authentication check 619 * above. If rval == 0, either Kerberos or local authentication 620 * succeeded. 621 */ 622 if (rval) { 623 reply(530, "Login incorrect."); 624 if (logging) { 625 syslog(LOG_NOTICE, 626 "FTP LOGIN FAILED FROM %s", remotehost); 627 syslog(LOG_AUTHPRIV | LOG_NOTICE, 628 "FTP LOGIN FAILED FROM %s, %s", 629 remotehost, curname); 630 } 631 pw = NULL; 632 if (login_attempts++ >= 5) { 633 syslog(LOG_NOTICE, 634 "repeated login failures from %s", 635 remotehost); 636 exit(0); 637 } 638 return; 639 } 640 } 641 642 /* password was ok; see if anything else prevents login */ 643 if (checkaccess(pw->pw_name)) { 644 reply(530, "User %s may not use FTP.", pw->pw_name); 645 if (logging) 646 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 647 remotehost, pw->pw_name); 648 pw = (struct passwd *) NULL; 649 return; 650 } 651 /* check for valid shell, if not guest user */ 652 if ((shell = pw->pw_shell) == NULL || *shell == 0) 653 shell = _PATH_BSHELL; 654 while ((cp = getusershell()) != NULL) 655 if (strcmp(cp, shell) == 0) 656 break; 657 endusershell(); 658 if (cp == NULL && guest == 0) { 659 reply(530, "User %s may not use FTP.", pw->pw_name); 660 if (logging) 661 syslog(LOG_NOTICE, 662 "FTP LOGIN REFUSED FROM %s, %s", 663 remotehost, pw->pw_name); 664 pw = (struct passwd *) NULL; 665 return; 666 } 667 668 login_attempts = 0; /* this time successful */ 669 if (setegid((gid_t)pw->pw_gid) < 0) { 670 reply(550, "Can't set gid."); 671 return; 672 } 673 (void) initgroups(pw->pw_name, pw->pw_gid); 674 675 /* open wtmp before chroot */ 676 logwtmp(ttyline, pw->pw_name, remotehost); 677 logged_in = 1; 678 679 dochroot = checkuser(conffilename(_PATH_FTPCHROOT), pw->pw_name); 680 681 /* parse ftpd.conf, setting up various parameters */ 682 if (guest) 683 parse_conf(CLASS_GUEST); 684 else if (dochroot) 685 parse_conf(CLASS_CHROOT); 686 else 687 parse_conf(CLASS_REAL); 688 689 if (guest) { 690 /* 691 * We MUST do a chdir() after the chroot. Otherwise 692 * the old current directory will be accessible as "." 693 * outside the new root! 694 */ 695 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 696 chdir("/") < 0) { 697 reply(550, "Can't set guest privileges."); 698 goto bad; 699 } 700 } else if (dochroot) { 701 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 702 reply(550, "Can't change root."); 703 goto bad; 704 } 705 } else if (chdir(pw->pw_dir) < 0) { 706 if (chdir("/") < 0) { 707 reply(530, "User %s: can't change directory to %s.", 708 pw->pw_name, pw->pw_dir); 709 goto bad; 710 } else 711 lreply(230, "No directory! Logging in with home=/"); 712 } 713 if (seteuid((uid_t)pw->pw_uid) < 0) { 714 reply(550, "Can't set uid."); 715 goto bad; 716 } 717 /* 718 * Display a login message, if it exists. 719 * N.B. reply(230,) must follow the message. 720 */ 721 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 722 char *cp, line[LINE_MAX]; 723 724 while (fgets(line, sizeof(line), fd) != NULL) { 725 if ((cp = strchr(line, '\n')) != NULL) 726 *cp = '\0'; 727 lreply(230, "%s", line); 728 } 729 (void) fflush(stdout); 730 (void) fclose(fd); 731 } 732 show_chdir_messages(230); 733 if (guest) { 734 reply(230, "Guest login ok, access restrictions apply."); 735 #ifdef HASSETPROCTITLE 736 snprintf(proctitle, sizeof(proctitle), 737 "%s: anonymous/%.*s", remotehost, 738 (int) (sizeof(proctitle) - sizeof(remotehost) - 739 sizeof(": anonymous/")), passwd); 740 setproctitle(proctitle); 741 #endif /* HASSETPROCTITLE */ 742 if (logging) 743 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 744 remotehost, passwd); 745 } else { 746 reply(230, "User %s logged in.", pw->pw_name); 747 #ifdef HASSETPROCTITLE 748 snprintf(proctitle, sizeof(proctitle), 749 "%s: %s", remotehost, pw->pw_name); 750 setproctitle(proctitle); 751 #endif /* HASSETPROCTITLE */ 752 if (logging) 753 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 754 remotehost, pw->pw_name); 755 } 756 (void) umask(curclass.umask); 757 return; 758 bad: 759 /* Forget all about it... */ 760 end_login(); 761 } 762 763 void 764 retrieve(cmd, name) 765 char *cmd, *name; 766 { 767 FILE *fin = NULL, *dout; 768 struct stat st; 769 int (*closefunc) __P((FILE *)) = NULL; 770 int log; 771 772 log = (cmd == 0); 773 if (cmd == 0) { 774 fin = fopen(name, "r"), closefunc = fclose; 775 if (fin == NULL) 776 cmd = do_conversion(name); 777 } 778 if (cmd) { 779 char line[BUFSIZ]; 780 781 (void)snprintf(line, sizeof(line), cmd, name), name = line; 782 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 783 st.st_size = -1; 784 st.st_blksize = BUFSIZ; 785 } 786 if (fin == NULL) { 787 if (errno != 0) { 788 perror_reply(550, name); 789 if (log) { 790 LOGCMD("get", name); 791 } 792 } 793 return; 794 } 795 byte_count = -1; 796 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 797 reply(550, "%s: not a plain file.", name); 798 goto done; 799 } 800 if (restart_point) { 801 if (type == TYPE_A) { 802 off_t i, n; 803 int c; 804 805 n = restart_point; 806 i = 0; 807 while (i++ < n) { 808 if ((c=getc(fin)) == EOF) { 809 perror_reply(550, name); 810 goto done; 811 } 812 if (c == '\n') 813 i++; 814 } 815 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 816 perror_reply(550, name); 817 goto done; 818 } 819 } 820 dout = dataconn(name, st.st_size, "w"); 821 if (dout == NULL) 822 goto done; 823 send_data(fin, dout, st.st_blksize); 824 (void) fclose(dout); 825 data = -1; 826 pdata = -1; 827 done: 828 if (log) 829 LOGBYTES("get", name, byte_count); 830 (*closefunc)(fin); 831 } 832 833 void 834 store(name, mode, unique) 835 char *name, *mode; 836 int unique; 837 { 838 FILE *fout, *din; 839 struct stat st; 840 int (*closefunc) __P((FILE *)); 841 842 if (unique && stat(name, &st) == 0 && 843 (name = gunique(name)) == NULL) { 844 LOGCMD(*mode == 'w' ? "put" : "append", name); 845 return; 846 } 847 848 if (restart_point) 849 mode = "r+"; 850 fout = fopen(name, mode); 851 closefunc = fclose; 852 if (fout == NULL) { 853 perror_reply(553, name); 854 LOGCMD(*mode == 'w' ? "put" : "append", name); 855 return; 856 } 857 byte_count = -1; 858 if (restart_point) { 859 if (type == TYPE_A) { 860 off_t i, n; 861 int c; 862 863 n = restart_point; 864 i = 0; 865 while (i++ < n) { 866 if ((c=getc(fout)) == EOF) { 867 perror_reply(550, name); 868 goto done; 869 } 870 if (c == '\n') 871 i++; 872 } 873 /* 874 * We must do this seek to "current" position 875 * because we are changing from reading to 876 * writing. 877 */ 878 if (fseek(fout, 0L, SEEK_CUR) < 0) { 879 perror_reply(550, name); 880 goto done; 881 } 882 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 883 perror_reply(550, name); 884 goto done; 885 } 886 } 887 din = dataconn(name, (off_t)-1, "r"); 888 if (din == NULL) 889 goto done; 890 if (receive_data(din, fout) == 0) { 891 if (unique) 892 reply(226, "Transfer complete (unique file name:%s).", 893 name); 894 else 895 reply(226, "Transfer complete."); 896 } 897 (void) fclose(din); 898 data = -1; 899 pdata = -1; 900 done: 901 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 902 (*closefunc)(fout); 903 } 904 905 static FILE * 906 getdatasock(mode) 907 char *mode; 908 { 909 int on = 1, s, t, tries; 910 911 if (data >= 0) 912 return (fdopen(data, mode)); 913 (void) seteuid((uid_t)0); 914 s = socket(AF_INET, SOCK_STREAM, 0); 915 if (s < 0) 916 goto bad; 917 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 918 (char *) &on, sizeof(on)) < 0) 919 goto bad; 920 /* anchor socket to avoid multi-homing problems */ 921 data_source.sin_len = sizeof(struct sockaddr_in); 922 data_source.sin_family = AF_INET; 923 data_source.sin_addr = ctrl_addr.sin_addr; 924 for (tries = 1; ; tries++) { 925 if (bind(s, (struct sockaddr *)&data_source, 926 sizeof(data_source)) >= 0) 927 break; 928 if (errno != EADDRINUSE || tries > 10) 929 goto bad; 930 sleep(tries); 931 } 932 (void) seteuid((uid_t)pw->pw_uid); 933 #ifdef IP_TOS 934 on = IPTOS_THROUGHPUT; 935 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 936 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 937 #endif 938 return (fdopen(s, mode)); 939 bad: 940 /* Return the real value of errno (close may change it) */ 941 t = errno; 942 (void) seteuid((uid_t)pw->pw_uid); 943 (void) close(s); 944 errno = t; 945 return (NULL); 946 } 947 948 static FILE * 949 dataconn(name, size, mode) 950 char *name; 951 off_t size; 952 char *mode; 953 { 954 char sizebuf[32]; 955 FILE *file; 956 int retry = 0, tos; 957 958 file_size = size; 959 byte_count = 0; 960 if (size != (off_t) -1) 961 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 962 (long long)size); 963 else 964 sizebuf[0] = '\0'; 965 if (pdata >= 0) { 966 struct sockaddr_in from; 967 int s, fromlen = sizeof(from); 968 969 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 970 if (s < 0) { 971 reply(425, "Can't open data connection."); 972 (void) close(pdata); 973 pdata = -1; 974 return (NULL); 975 } 976 (void) close(pdata); 977 pdata = s; 978 #ifdef IP_TOS 979 tos = IPTOS_THROUGHPUT; 980 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 981 sizeof(int)); 982 #endif 983 reply(150, "Opening %s mode data connection for '%s'%s.", 984 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 985 return (fdopen(pdata, mode)); 986 } 987 if (data >= 0) { 988 reply(125, "Using existing data connection for '%s'%s.", 989 name, sizebuf); 990 usedefault = 1; 991 return (fdopen(data, mode)); 992 } 993 if (usedefault) 994 data_dest = his_addr; 995 usedefault = 1; 996 file = getdatasock(mode); 997 if (file == NULL) { 998 reply(425, "Can't create data socket (%s,%d): %s.", 999 inet_ntoa(data_source.sin_addr), 1000 ntohs(data_source.sin_port), strerror(errno)); 1001 return (NULL); 1002 } 1003 data = fileno(file); 1004 while (connect(data, (struct sockaddr *)&data_dest, 1005 sizeof(data_dest)) < 0) { 1006 if (errno == EADDRINUSE && retry < swaitmax) { 1007 sleep((unsigned) swaitint); 1008 retry += swaitint; 1009 continue; 1010 } 1011 perror_reply(425, "Can't build data connection"); 1012 (void) fclose(file); 1013 data = -1; 1014 return (NULL); 1015 } 1016 reply(150, "Opening %s mode data connection for '%s'%s.", 1017 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1018 return (file); 1019 } 1020 1021 /* 1022 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1023 * encapsulation of the data subject * to Mode, Structure, and Type. 1024 * 1025 * NB: Form isn't handled. 1026 */ 1027 static void 1028 send_data(instr, outstr, blksize) 1029 FILE *instr, *outstr; 1030 off_t blksize; 1031 { 1032 int c, cnt, filefd, netfd; 1033 char *buf; 1034 1035 transflag++; 1036 if (setjmp(urgcatch)) { 1037 transflag = 0; 1038 return; 1039 } 1040 1041 switch (type) { 1042 1043 case TYPE_A: 1044 while ((c = getc(instr)) != EOF) { 1045 byte_count++; 1046 if (c == '\n') { 1047 if (ferror(outstr)) 1048 goto data_err; 1049 (void) putc('\r', outstr); 1050 } 1051 (void) putc(c, outstr); 1052 } 1053 fflush(outstr); 1054 transflag = 0; 1055 if (ferror(instr)) 1056 goto file_err; 1057 if (ferror(outstr)) 1058 goto data_err; 1059 reply(226, "Transfer complete."); 1060 return; 1061 1062 case TYPE_I: 1063 case TYPE_L: 1064 if ((buf = malloc((u_int)blksize)) == NULL) { 1065 transflag = 0; 1066 perror_reply(451, "Local resource failure: malloc"); 1067 return; 1068 } 1069 netfd = fileno(outstr); 1070 filefd = fileno(instr); 1071 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1072 write(netfd, buf, cnt) == cnt) 1073 byte_count += cnt; 1074 transflag = 0; 1075 (void)free(buf); 1076 if (cnt != 0) { 1077 if (cnt < 0) 1078 goto file_err; 1079 goto data_err; 1080 } 1081 reply(226, "Transfer complete."); 1082 return; 1083 default: 1084 transflag = 0; 1085 reply(550, "Unimplemented TYPE %d in send_data", type); 1086 return; 1087 } 1088 1089 data_err: 1090 transflag = 0; 1091 perror_reply(426, "Data connection"); 1092 return; 1093 1094 file_err: 1095 transflag = 0; 1096 perror_reply(551, "Error on input file"); 1097 } 1098 1099 /* 1100 * Transfer data from peer to "outstr" using the appropriate encapulation of 1101 * the data subject to Mode, Structure, and Type. 1102 * 1103 * N.B.: Form isn't handled. 1104 */ 1105 static int 1106 receive_data(instr, outstr) 1107 FILE *instr, *outstr; 1108 { 1109 int c, cnt, bare_lfs; 1110 char buf[BUFSIZ]; 1111 #ifdef __GNUC__ 1112 (void) &bare_lfs; 1113 #endif 1114 1115 bare_lfs = 0; 1116 transflag++; 1117 if (setjmp(urgcatch)) { 1118 transflag = 0; 1119 return (-1); 1120 } 1121 1122 switch (type) { 1123 1124 case TYPE_I: 1125 case TYPE_L: 1126 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1127 if (write(fileno(outstr), buf, cnt) != cnt) 1128 goto file_err; 1129 byte_count += cnt; 1130 } 1131 if (cnt < 0) 1132 goto data_err; 1133 transflag = 0; 1134 return (0); 1135 1136 case TYPE_E: 1137 reply(553, "TYPE E not implemented."); 1138 transflag = 0; 1139 return (-1); 1140 1141 case TYPE_A: 1142 while ((c = getc(instr)) != EOF) { 1143 byte_count++; 1144 if (c == '\n') 1145 bare_lfs++; 1146 while (c == '\r') { 1147 if (ferror(outstr)) 1148 goto data_err; 1149 if ((c = getc(instr)) != '\n') { 1150 (void) putc ('\r', outstr); 1151 if (c == '\0' || c == EOF) 1152 goto contin2; 1153 } 1154 } 1155 (void) putc(c, outstr); 1156 contin2: ; 1157 } 1158 fflush(outstr); 1159 if (ferror(instr)) 1160 goto data_err; 1161 if (ferror(outstr)) 1162 goto file_err; 1163 transflag = 0; 1164 if (bare_lfs) { 1165 lreply(226, 1166 "WARNING! %d bare linefeeds received in ASCII mode", 1167 bare_lfs); 1168 (void)printf(" File may not have transferred correctly.\r\n"); 1169 } 1170 return (0); 1171 default: 1172 reply(550, "Unimplemented TYPE %d in receive_data", type); 1173 transflag = 0; 1174 return (-1); 1175 } 1176 1177 data_err: 1178 transflag = 0; 1179 perror_reply(426, "Data Connection"); 1180 return (-1); 1181 1182 file_err: 1183 transflag = 0; 1184 perror_reply(452, "Error writing file"); 1185 return (-1); 1186 } 1187 1188 void 1189 statfilecmd(filename) 1190 char *filename; 1191 { 1192 FILE *fin; 1193 int c; 1194 char line[LINE_MAX]; 1195 1196 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1197 fin = ftpd_popen(line, "r", 0); 1198 lreply(211, "status of %s:", filename); 1199 while ((c = getc(fin)) != EOF) { 1200 if (c == '\n') { 1201 if (ferror(stdout)){ 1202 perror_reply(421, "control connection"); 1203 (void) ftpd_pclose(fin); 1204 dologout(1); 1205 /* NOTREACHED */ 1206 } 1207 if (ferror(fin)) { 1208 perror_reply(551, filename); 1209 (void) ftpd_pclose(fin); 1210 return; 1211 } 1212 (void) putc('\r', stdout); 1213 } 1214 (void) putc(c, stdout); 1215 } 1216 (void) ftpd_pclose(fin); 1217 reply(211, "End of Status"); 1218 } 1219 1220 void 1221 statcmd() 1222 { 1223 struct sockaddr_in *sin; 1224 u_char *a, *p; 1225 1226 lreply(211, "%s FTP server status:", hostname); 1227 lreply(211, "%s", version); 1228 if (isdigit(remotehost[0])) 1229 lreply(211, "Connected to %s", remotehost); 1230 else 1231 lreply(211, "Connected to %s (%s)", remotehost, 1232 inet_ntoa(his_addr.sin_addr)); 1233 if (logged_in) { 1234 if (guest) 1235 lreply(211, "Logged in anonymously"); 1236 else 1237 lreply(211, "Logged in as %s", pw->pw_name); 1238 } else if (askpasswd) 1239 lreply(211, "Waiting for password"); 1240 else 1241 lreply(211, "Waiting for user name"); 1242 printf("211- TYPE: %s", typenames[type]); 1243 if (type == TYPE_A || type == TYPE_E) 1244 printf(", FORM: %s", formnames[form]); 1245 if (type == TYPE_L) 1246 #if NBBY == 8 1247 printf(" %d", NBBY); 1248 #else 1249 printf(" %d", bytesize); /* need definition! */ 1250 #endif 1251 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1252 strunames[stru], modenames[mode]); 1253 if (data != -1) 1254 lreply(211, "Data connection open"); 1255 else if (pdata != -1) { 1256 printf("211- in Passive mode"); 1257 sin = &pasv_addr; 1258 goto printaddr; 1259 } else if (usedefault == 0) { 1260 printf("211- PORT"); 1261 sin = &data_dest; 1262 printaddr: 1263 a = (u_char *) &sin->sin_addr; 1264 p = (u_char *) &sin->sin_port; 1265 #define UC(b) (((int) b) & 0xff) 1266 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1267 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1268 #undef UC 1269 } else 1270 lreply(211, "No data connection"); 1271 1272 if (logged_in) { 1273 struct ftpconv *cp; 1274 1275 lreply(211, ""); 1276 lreply(211, "Class: %s", curclass.classname); 1277 if (curclass.display) 1278 lreply(211, "Display file: %s", curclass.display); 1279 if (curclass.notify) 1280 lreply(211, "Notify fileglob: %s", curclass.notify); 1281 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1282 curclass.timeout, curclass.maxtimeout); 1283 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1284 curclass.modify ? "en" : "dis"); 1285 lreply(211, "Umask: %.04o", curclass.umask); 1286 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1287 if (cp->suffix == NULL || cp->types == NULL || 1288 cp->command == NULL) 1289 continue; 1290 lreply(211, 1291 "Conversion: %s [%s] disable: %s, command: %s", 1292 cp->suffix, cp->types, cp->disable, cp->command); 1293 } 1294 } 1295 1296 reply(211, "End of status"); 1297 } 1298 1299 void 1300 fatal(s) 1301 char *s; 1302 { 1303 1304 reply(451, "Error in server: %s\n", s); 1305 reply(221, "Closing connection due to server error."); 1306 dologout(0); 1307 /* NOTREACHED */ 1308 } 1309 1310 void 1311 #if __STDC__ 1312 reply(int n, const char *fmt, ...) 1313 #else 1314 reply(n, fmt, va_alist) 1315 int n; 1316 char *fmt; 1317 va_dcl 1318 #endif 1319 { 1320 va_list ap; 1321 #if __STDC__ 1322 va_start(ap, fmt); 1323 #else 1324 va_start(ap); 1325 #endif 1326 (void)printf("%d ", n); 1327 (void)vprintf(fmt, ap); 1328 (void)printf("\r\n"); 1329 (void)fflush(stdout); 1330 if (debug) { 1331 syslog(LOG_DEBUG, "<--- %d ", n); 1332 vsyslog(LOG_DEBUG, fmt, ap); 1333 } 1334 } 1335 1336 void 1337 #if __STDC__ 1338 lreply(int n, const char *fmt, ...) 1339 #else 1340 lreply(n, fmt, va_alist) 1341 int n; 1342 char *fmt; 1343 va_dcl 1344 #endif 1345 { 1346 va_list ap; 1347 #if __STDC__ 1348 va_start(ap, fmt); 1349 #else 1350 va_start(ap); 1351 #endif 1352 (void)printf("%d- ", n); 1353 (void)vprintf(fmt, ap); 1354 (void)printf("\r\n"); 1355 (void)fflush(stdout); 1356 if (debug) { 1357 syslog(LOG_DEBUG, "<--- %d- ", n); 1358 vsyslog(LOG_DEBUG, fmt, ap); 1359 } 1360 } 1361 1362 static void 1363 ack(s) 1364 char *s; 1365 { 1366 1367 reply(250, "%s command successful.", s); 1368 } 1369 1370 void 1371 nack(s) 1372 char *s; 1373 { 1374 1375 reply(502, "%s command not implemented.", s); 1376 } 1377 1378 /* ARGSUSED */ 1379 void 1380 yyerror(s) 1381 char *s; 1382 { 1383 char *cp; 1384 1385 if ((cp = strchr(cbuf,'\n')) != NULL) 1386 *cp = '\0'; 1387 reply(500, "'%s': command not understood.", cbuf); 1388 } 1389 1390 void 1391 delete(name) 1392 char *name; 1393 { 1394 struct stat st; 1395 1396 LOGCMD("delete", name); 1397 if (stat(name, &st) < 0) { 1398 perror_reply(550, name); 1399 return; 1400 } 1401 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1402 if (rmdir(name) < 0) { 1403 perror_reply(550, name); 1404 return; 1405 } 1406 goto done; 1407 } 1408 if (unlink(name) < 0) { 1409 perror_reply(550, name); 1410 return; 1411 } 1412 done: 1413 ack("DELE"); 1414 } 1415 1416 void 1417 cwd(path) 1418 char *path; 1419 { 1420 1421 if (chdir(path) < 0) 1422 perror_reply(550, path); 1423 else { 1424 show_chdir_messages(250); 1425 ack("CWD"); 1426 } 1427 } 1428 1429 static void 1430 replydirname(name, message) 1431 const char *name, *message; 1432 { 1433 char npath[MAXPATHLEN + 1]; 1434 int i; 1435 1436 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1437 npath[i] = *name; 1438 if (*name == '"') 1439 npath[++i] = '"'; 1440 } 1441 npath[i] = '\0'; 1442 reply(257, "\"%s\" %s", npath, message); 1443 } 1444 1445 void 1446 makedir(name) 1447 char *name; 1448 { 1449 1450 LOGCMD("mkdir", name); 1451 if (mkdir(name, 0777) < 0) 1452 perror_reply(550, name); 1453 else 1454 replydirname(name, "directory created."); 1455 } 1456 1457 void 1458 removedir(name) 1459 char *name; 1460 { 1461 1462 LOGCMD("rmdir", name); 1463 if (rmdir(name) < 0) 1464 perror_reply(550, name); 1465 else 1466 ack("RMD"); 1467 } 1468 1469 void 1470 pwd() 1471 { 1472 char path[MAXPATHLEN + 1]; 1473 1474 if (getcwd(path, sizeof(path) - 1) == NULL) 1475 reply(550, "%s.", path); 1476 else 1477 replydirname(path, "is the current directory."); 1478 } 1479 1480 char * 1481 renamefrom(name) 1482 char *name; 1483 { 1484 struct stat st; 1485 1486 if (stat(name, &st) < 0) { 1487 perror_reply(550, name); 1488 return ((char *)0); 1489 } 1490 reply(350, "File exists, ready for destination name"); 1491 return (name); 1492 } 1493 1494 void 1495 renamecmd(from, to) 1496 char *from, *to; 1497 { 1498 1499 LOGCMD2("rename", from, to); 1500 if (rename(from, to) < 0) 1501 perror_reply(550, "rename"); 1502 else 1503 ack("RNTO"); 1504 } 1505 1506 static void 1507 dolog(sin) 1508 struct sockaddr_in *sin; 1509 { 1510 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1511 sizeof(struct in_addr), AF_INET); 1512 1513 if (hp) 1514 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1515 else 1516 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1517 sizeof(remotehost)); 1518 #ifdef HASSETPROCTITLE 1519 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1520 setproctitle(proctitle); 1521 #endif /* HASSETPROCTITLE */ 1522 1523 if (logging) 1524 syslog(LOG_INFO, "connection from %s", remotehost); 1525 } 1526 1527 /* 1528 * Record logout in wtmp file 1529 * and exit with supplied status. 1530 */ 1531 void 1532 dologout(status) 1533 int status; 1534 { 1535 /* 1536 * Prevent reception of SIGURG from resulting in a resumption 1537 * back to the main program loop. 1538 */ 1539 transflag = 0; 1540 1541 if (logged_in) { 1542 (void) seteuid((uid_t)0); 1543 logwtmp(ttyline, "", ""); 1544 #ifdef KERBEROS 1545 if (!notickets && krbtkfile_env) 1546 unlink(krbtkfile_env); 1547 #endif 1548 } 1549 /* beware of flushing buffers after a SIGPIPE */ 1550 _exit(status); 1551 } 1552 1553 static void 1554 myoob(signo) 1555 int signo; 1556 { 1557 char *cp; 1558 1559 /* only process if transfer occurring */ 1560 if (!transflag) 1561 return; 1562 cp = tmpline; 1563 if (getline(cp, 7, stdin) == NULL) { 1564 reply(221, "You could at least say goodbye."); 1565 dologout(0); 1566 } 1567 upper(cp); 1568 if (strcmp(cp, "ABOR\r\n") == 0) { 1569 tmpline[0] = '\0'; 1570 reply(426, "Transfer aborted. Data connection closed."); 1571 reply(226, "Abort successful"); 1572 longjmp(urgcatch, 1); 1573 } 1574 if (strcmp(cp, "STAT\r\n") == 0) { 1575 if (file_size != (off_t) -1) 1576 reply(213, "Status: %qd of %qd bytes transferred", 1577 byte_count, file_size); 1578 else 1579 reply(213, "Status: %qd bytes transferred", byte_count); 1580 } 1581 } 1582 1583 /* 1584 * Note: a response of 425 is not mentioned as a possible response to 1585 * the PASV command in RFC959. However, it has been blessed as 1586 * a legitimate response by Jon Postel in a telephone conversation 1587 * with Rick Adams on 25 Jan 89. 1588 */ 1589 void 1590 passive() 1591 { 1592 int len; 1593 char *p, *a; 1594 1595 pdata = socket(AF_INET, SOCK_STREAM, 0); 1596 if (pdata < 0 || !logged_in) { 1597 perror_reply(425, "Can't open passive connection"); 1598 return; 1599 } 1600 pasv_addr = ctrl_addr; 1601 pasv_addr.sin_port = 0; 1602 (void) seteuid((uid_t)0); 1603 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1604 (void) seteuid((uid_t)pw->pw_uid); 1605 goto pasv_error; 1606 } 1607 (void) seteuid((uid_t)pw->pw_uid); 1608 len = sizeof(pasv_addr); 1609 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1610 goto pasv_error; 1611 if (listen(pdata, 1) < 0) 1612 goto pasv_error; 1613 a = (char *) &pasv_addr.sin_addr; 1614 p = (char *) &pasv_addr.sin_port; 1615 1616 #define UC(b) (((int) b) & 0xff) 1617 1618 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1619 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1620 return; 1621 1622 pasv_error: 1623 (void) close(pdata); 1624 pdata = -1; 1625 perror_reply(425, "Can't open passive connection"); 1626 return; 1627 } 1628 1629 /* 1630 * Generate unique name for file with basename "local". 1631 * The file named "local" is already known to exist. 1632 * Generates failure reply on error. 1633 * 1634 * XXX this function should under go changes similar to 1635 * the mktemp(3)/mkstemp(3) changes. 1636 */ 1637 static char * 1638 gunique(local) 1639 char *local; 1640 { 1641 static char new[MAXPATHLEN]; 1642 struct stat st; 1643 int count, len; 1644 char *cp; 1645 1646 cp = strrchr(local, '/'); 1647 if (cp) 1648 *cp = '\0'; 1649 if (stat(cp ? local : ".", &st) < 0) { 1650 perror_reply(553, cp ? local : "."); 1651 return ((char *) 0); 1652 } 1653 if (cp) 1654 *cp = '/'; 1655 (void) strcpy(new, local); 1656 len = strlen(new); 1657 cp = new + len; 1658 *cp++ = '.'; 1659 for (count = 1; count < 100; count++) { 1660 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1661 if (stat(new, &st) < 0) 1662 return (new); 1663 } 1664 reply(452, "Unique file name cannot be created."); 1665 return (NULL); 1666 } 1667 1668 /* 1669 * Format and send reply containing system error number. 1670 */ 1671 void 1672 perror_reply(code, string) 1673 int code; 1674 char *string; 1675 { 1676 1677 reply(code, "%s: %s.", string, strerror(errno)); 1678 } 1679 1680 static char *onefile[] = { 1681 "", 1682 0 1683 }; 1684 1685 void 1686 send_file_list(whichf) 1687 char *whichf; 1688 { 1689 struct stat st; 1690 DIR *dirp = NULL; 1691 struct dirent *dir; 1692 FILE *dout = NULL; 1693 char **dirlist, *dirname; 1694 int simple = 0; 1695 int freeglob = 0; 1696 glob_t gl; 1697 #ifdef __GNUC__ 1698 (void) &dout; 1699 (void) &dirlist; 1700 (void) &simple; 1701 (void) &freeglob; 1702 #endif 1703 1704 if (strpbrk(whichf, "~{[*?") != NULL) { 1705 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1706 1707 memset(&gl, 0, sizeof(gl)); 1708 freeglob = 1; 1709 if (glob(whichf, flags, 0, &gl)) { 1710 reply(550, "not found"); 1711 goto out; 1712 } else if (gl.gl_pathc == 0) { 1713 errno = ENOENT; 1714 perror_reply(550, whichf); 1715 goto out; 1716 } 1717 dirlist = gl.gl_pathv; 1718 } else { 1719 onefile[0] = whichf; 1720 dirlist = onefile; 1721 simple = 1; 1722 } 1723 1724 if (setjmp(urgcatch)) { 1725 transflag = 0; 1726 goto out; 1727 } 1728 while ((dirname = *dirlist++) != NULL) { 1729 int trailingslash = 0; 1730 1731 if (stat(dirname, &st) < 0) { 1732 /* 1733 * If user typed "ls -l", etc, and the client 1734 * used NLST, do what the user meant. 1735 */ 1736 if (dirname[0] == '-' && *dirlist == NULL && 1737 transflag == 0) { 1738 retrieve("/bin/ls %s", dirname); 1739 goto out; 1740 } 1741 perror_reply(550, whichf); 1742 if (dout != NULL) { 1743 (void) fclose(dout); 1744 transflag = 0; 1745 data = -1; 1746 pdata = -1; 1747 } 1748 goto out; 1749 } 1750 1751 if (S_ISREG(st.st_mode)) { 1752 if (dout == NULL) { 1753 dout = dataconn("file list", (off_t)-1, "w"); 1754 if (dout == NULL) 1755 goto out; 1756 transflag++; 1757 } 1758 fprintf(dout, "%s%s\n", dirname, 1759 type == TYPE_A ? "\r" : ""); 1760 byte_count += strlen(dirname) + 1; 1761 continue; 1762 } else if (!S_ISDIR(st.st_mode)) 1763 continue; 1764 1765 if (dirname[strlen(dirname) - 1] == '/') 1766 trailingslash++; 1767 1768 if ((dirp = opendir(dirname)) == NULL) 1769 continue; 1770 1771 while ((dir = readdir(dirp)) != NULL) { 1772 char nbuf[MAXPATHLEN]; 1773 1774 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1775 continue; 1776 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1777 dir->d_namlen == 2) 1778 continue; 1779 1780 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1781 trailingslash ? "" : "/", dir->d_name); 1782 1783 /* 1784 * We have to do a stat to ensure it's 1785 * not a directory or special file. 1786 */ 1787 if (simple || (stat(nbuf, &st) == 0 && 1788 S_ISREG(st.st_mode))) { 1789 if (dout == NULL) { 1790 dout = dataconn("file list", (off_t)-1, 1791 "w"); 1792 if (dout == NULL) 1793 goto out; 1794 transflag++; 1795 } 1796 if (nbuf[0] == '.' && nbuf[1] == '/') 1797 fprintf(dout, "%s%s\n", &nbuf[2], 1798 type == TYPE_A ? "\r" : ""); 1799 else 1800 fprintf(dout, "%s%s\n", nbuf, 1801 type == TYPE_A ? "\r" : ""); 1802 byte_count += strlen(nbuf) + 1; 1803 } 1804 } 1805 (void) closedir(dirp); 1806 } 1807 1808 if (dout == NULL) 1809 reply(550, "No files found."); 1810 else if (ferror(dout) != 0) 1811 perror_reply(550, "Data connection"); 1812 else 1813 reply(226, "Transfer complete."); 1814 1815 transflag = 0; 1816 if (dout != NULL) 1817 (void) fclose(dout); 1818 data = -1; 1819 pdata = -1; 1820 out: 1821 if (freeglob) { 1822 freeglob = 0; 1823 globfree(&gl); 1824 } 1825 } 1826 1827 char * 1828 conffilename(s) 1829 const char *s; 1830 { 1831 static char filename[MAXPATHLEN]; 1832 1833 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1834 return filename; 1835 } 1836
Indexes created Mon Sep 22 05:09:51 GMT 2025