ftpd.c revision 1.42
1 /* $NetBSD: ftpd.c,v 1.42 1997/11/28 23:32:30 lukem 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 1.42 1997/11/28 23:32:30 lukem 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 #ifdef KERBEROS5 91 #include <krb5.h> 92 #endif 93 94 #include "extern.h" 95 #include "pathnames.h" 96 97 #if __STDC__ 98 #include <stdarg.h> 99 #else 100 #include <varargs.h> 101 #endif 102 103 static char version[] = "Version 7.02"; 104 105 extern off_t restart_point; 106 extern char cbuf[]; 107 extern int yyparse __P((void)); 108 109 struct sockaddr_in ctrl_addr; 110 struct sockaddr_in data_source; 111 struct sockaddr_in data_dest; 112 struct sockaddr_in his_addr; 113 struct sockaddr_in pasv_addr; 114 115 int data; 116 jmp_buf errcatch, urgcatch; 117 int logged_in; 118 struct passwd *pw; 119 int debug; 120 int logging; 121 int guest; 122 int dochroot; 123 int type; 124 int form; 125 int stru; /* avoid C keyword */ 126 int mode; 127 int usedefault = 1; /* for data transfers */ 128 int pdata = -1; /* for passive mode */ 129 sig_atomic_t transflag; 130 off_t file_size; 131 off_t byte_count; 132 char tmpline[7]; 133 char hostname[MAXHOSTNAMELEN]; 134 char remotehost[MAXHOSTNAMELEN]; 135 static char ttyline[20]; 136 char *tty = ttyline; /* for klogin */ 137 static char *anondir = NULL; 138 static char confdir[MAXPATHLEN]; 139 140 extern struct ftpclass curclass; 141 142 #if defined(KERBEROS) || defined(KERBEROS5) 143 int notickets = 1; 144 char *krbtkfile_env = NULL; 145 #endif 146 #ifdef KERBEROS5 147 extern krb5_context kcontext; 148 #endif 149 150 /* 151 * Timeout intervals for retrying connections 152 * to hosts that don't accept PORT cmds. This 153 * is a kludge, but given the problems with TCP... 154 */ 155 #define SWAITMAX 90 /* wait at most 90 seconds */ 156 #define SWAITINT 5 /* interval between retries */ 157 158 int swaitmax = SWAITMAX; 159 int swaitint = SWAITINT; 160 161 #ifdef HASSETPROCTITLE 162 char proctitle[BUFSIZ]; /* initial part of title */ 163 #endif /* HASSETPROCTITLE */ 164 165 #define LOGCMD(cmd, file) \ 166 if (logging > 1) \ 167 syslog(LOG_INFO,"%s %s%s", cmd, \ 168 *(file) == '/' ? "" : curdir(), file); 169 #define LOGCMD2(cmd, file1, file2) \ 170 if (logging > 1) \ 171 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 172 *(file1) == '/' ? "" : curdir(), file1, \ 173 *(file2) == '/' ? "" : curdir(), file2); 174 #define LOGBYTES(cmd, file, cnt) \ 175 if (logging > 1) { \ 176 if (cnt == (off_t)-1) \ 177 syslog(LOG_INFO,"%s %s%s", cmd, \ 178 *(file) == '/' ? "" : curdir(), file); \ 179 else \ 180 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 181 cmd, (*(file) == '/') ? "" : curdir(), file, \ 182 (long long)cnt); \ 183 } 184 185 static void ack __P((char *)); 186 static void myoob __P((int)); 187 static int checkuser __P((char *, char *)); 188 static int checkaccess __P((char *)); 189 static FILE *dataconn __P((char *, off_t, char *)); 190 static void dolog __P((struct sockaddr_in *)); 191 static char *curdir __P((void)); 192 static void end_login __P((void)); 193 static FILE *getdatasock __P((char *)); 194 static char *gunique __P((char *)); 195 static void lostconn __P((int)); 196 static int receive_data __P((FILE *, FILE *)); 197 static void replydirname __P((const char *, const char *)); 198 static void send_data __P((FILE *, FILE *, off_t)); 199 static struct passwd * 200 sgetpwnam __P((char *)); 201 static char *sgetsave __P((char *)); 202 203 int main __P((int, char *[])); 204 205 #if defined(KERBEROS) || defined(KERBEROS5) 206 int klogin __P((struct passwd *, char *, char *, char *)); 207 void kdestroy __P((void)); 208 #endif 209 210 static char * 211 curdir() 212 { 213 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 214 215 if (getcwd(path, sizeof(path)-2) == NULL) 216 return (""); 217 if (path[1] != '\0') /* special case for root dir. */ 218 strcat(path, "/"); 219 /* For guest account, skip / since it's chrooted */ 220 return (guest ? path+1 : path); 221 } 222 223 int 224 main(argc, argv) 225 int argc; 226 char *argv[]; 227 { 228 int addrlen, ch, on = 1, tos; 229 char *cp, line[LINE_MAX]; 230 FILE *fd; 231 #ifdef KERBEROS5 232 krb5_error_code kerror; 233 #endif 234 235 debug = 0; 236 logging = 0; 237 (void)strcpy(confdir, _DEFAULT_CONFDIR); 238 239 while ((ch = getopt(argc, argv, "a:c:C:dlt:T:u:v")) != -1) { 240 switch (ch) { 241 case 'a': 242 anondir = optarg; 243 break; 244 245 case 'c': 246 (void)strncpy(confdir, optarg, sizeof(confdir)); 247 confdir[sizeof(confdir)-1] = '\0'; 248 break; 249 250 case 'C': 251 exit(checkaccess(optarg)); 252 /* NOTREACHED */ 253 254 case 'd': 255 case 'v': /* deprecated */ 256 debug = 1; 257 break; 258 259 case 'l': 260 logging++; /* > 1 == extra logging */ 261 break; 262 263 case 't': 264 case 'T': 265 case 'u': 266 warnx("-%c has been deprecated in favour of ftpd.conf", 267 ch); 268 break; 269 270 default: 271 if (optopt == 'a' || optopt == 'C') 272 exit(1); 273 warnx("unknown flag -%c ignored", optopt); 274 break; 275 } 276 } 277 278 /* 279 * LOG_NDELAY sets up the logging connection immediately, 280 * necessary for anonymous ftp's that chroot and can't do it later. 281 */ 282 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 283 addrlen = sizeof(his_addr); 284 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 285 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 286 exit(1); 287 } 288 addrlen = sizeof(ctrl_addr); 289 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 290 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 291 exit(1); 292 } 293 #ifdef IP_TOS 294 tos = IPTOS_LOWDELAY; 295 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 296 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 297 #endif 298 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 299 300 /* set this here so klogin can use it... */ 301 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 302 303 (void) freopen(_PATH_DEVNULL, "w", stderr); 304 (void) signal(SIGPIPE, lostconn); 305 (void) signal(SIGCHLD, SIG_IGN); 306 if ((long)signal(SIGURG, myoob) < 0) 307 syslog(LOG_ERR, "signal: %m"); 308 309 /* Try to handle urgent data inline */ 310 #ifdef SO_OOBINLINE 311 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 312 syslog(LOG_ERR, "setsockopt: %m"); 313 #endif 314 315 #ifdef F_SETOWN 316 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 317 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 318 #endif 319 dolog(&his_addr); 320 /* 321 * Set up default state 322 */ 323 data = -1; 324 type = TYPE_A; 325 form = FORM_N; 326 stru = STRU_F; 327 mode = MODE_S; 328 tmpline[0] = '\0'; 329 330 #ifdef KERBEROS5 331 kerror = krb5_init_context(&kcontext); 332 if (kerror) { 333 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 334 error_message(kerror)); 335 exit(0); 336 } 337 #endif KERBEROS5 338 339 /* If logins are disabled, print out the message. */ 340 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 341 while (fgets(line, sizeof(line), fd) != NULL) { 342 if ((cp = strchr(line, '\n')) != NULL) 343 *cp = '\0'; 344 lreply(530, "%s", line); 345 } 346 (void) fflush(stdout); 347 (void) fclose(fd); 348 reply(530, "System not available."); 349 exit(0); 350 } 351 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 352 while (fgets(line, sizeof(line), fd) != NULL) { 353 if ((cp = strchr(line, '\n')) != NULL) 354 *cp = '\0'; 355 lreply(220, "%s", line); 356 } 357 (void) fflush(stdout); 358 (void) fclose(fd); 359 /* reply(220,) must follow */ 360 } 361 (void) gethostname(hostname, sizeof(hostname)); 362 reply(220, "%s FTP server (%s) ready.", hostname, version); 363 (void) setjmp(errcatch); 364 curclass.timeout = 900; /* 15 minutes. XXXLUKEM this is ugly */ 365 for (;;) 366 (void) yyparse(); 367 /* NOTREACHED */ 368 } 369 370 static void 371 lostconn(signo) 372 int signo; 373 { 374 375 if (debug) 376 syslog(LOG_DEBUG, "lost connection"); 377 dologout(1); 378 } 379 380 /* 381 * Helper function for sgetpwnam(). 382 */ 383 static char * 384 sgetsave(s) 385 char *s; 386 { 387 char *new = malloc((unsigned) strlen(s) + 1); 388 389 if (new == NULL) { 390 perror_reply(421, "Local resource failure: malloc"); 391 dologout(1); 392 /* NOTREACHED */ 393 } 394 (void) strcpy(new, s); 395 return (new); 396 } 397 398 /* 399 * Save the result of a getpwnam. Used for USER command, since 400 * the data returned must not be clobbered by any other command 401 * (e.g., globbing). 402 */ 403 static struct passwd * 404 sgetpwnam(name) 405 char *name; 406 { 407 static struct passwd save; 408 struct passwd *p; 409 410 if ((p = getpwnam(name)) == NULL) 411 return (p); 412 if (save.pw_name) { 413 free(save.pw_name); 414 free(save.pw_passwd); 415 free(save.pw_gecos); 416 free(save.pw_dir); 417 free(save.pw_shell); 418 } 419 save = *p; 420 save.pw_name = sgetsave(p->pw_name); 421 save.pw_passwd = sgetsave(p->pw_passwd); 422 save.pw_gecos = sgetsave(p->pw_gecos); 423 save.pw_dir = sgetsave(p->pw_dir); 424 save.pw_shell = sgetsave(p->pw_shell); 425 return (&save); 426 } 427 428 static int login_attempts; /* number of failed login attempts */ 429 static int askpasswd; /* had user command, ask for passwd */ 430 static char curname[10]; /* current USER name */ 431 432 /* 433 * USER command. 434 * Sets global passwd pointer pw if named account exists and is acceptable; 435 * sets askpasswd if a PASS command is expected. If logged in previously, 436 * need to reset state. If name is "ftp" or "anonymous", the name is not in 437 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 438 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 439 * requesting login privileges. Disallow anyone who does not have a standard 440 * shell as returned by getusershell(). Disallow anyone mentioned in the file 441 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 442 */ 443 void 444 user(name) 445 char *name; 446 { 447 if (logged_in) { 448 if (guest) { 449 reply(530, "Can't change user from guest login."); 450 return; 451 } else if (dochroot) { 452 reply(530, "Can't change user from chroot user."); 453 return; 454 } 455 end_login(); 456 } 457 458 #if defined(KERBEROS) || defined(KERBEROS5) 459 kdestroy(); 460 #endif 461 462 guest = 0; 463 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 464 if (checkaccess("ftp") || checkaccess("anonymous")) 465 reply(530, "User %s access denied.", name); 466 else if ((pw = sgetpwnam("ftp")) != NULL) { 467 guest = 1; 468 askpasswd = 1; 469 reply(331, 470 "Guest login ok, type your name as password."); 471 } else 472 reply(530, "User %s unknown.", name); 473 if (!askpasswd && logging) 474 syslog(LOG_NOTICE, 475 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 476 return; 477 } 478 479 pw = sgetpwnam(name); 480 if (logging) 481 strncpy(curname, name, sizeof(curname)-1); 482 483 #ifdef SKEY 484 if (skey_haskey(name) == 0) { 485 char *myskey; 486 487 myskey = skey_keyinfo(name); 488 reply(331, "Password [%s] required for %s.", 489 myskey ? myskey : "error getting challenge", name); 490 } else 491 #endif 492 reply(331, "Password required for %s.", name); 493 494 askpasswd = 1; 495 /* 496 * Delay before reading passwd after first failed 497 * attempt to slow down passwd-guessing programs. 498 */ 499 if (login_attempts) 500 sleep((unsigned) login_attempts); 501 } 502 503 /* 504 * Check if a user is in the file "fname" 505 */ 506 static int 507 checkuser(fname, name) 508 char *fname; 509 char *name; 510 { 511 FILE *fd; 512 int found = 0; 513 char *p, line[BUFSIZ]; 514 515 if ((fd = fopen(fname, "r")) != NULL) { 516 while (fgets(line, sizeof(line), fd) != NULL) 517 if ((p = strchr(line, '\n')) != NULL) { 518 *p = '\0'; 519 if (line[0] == '#') 520 continue; 521 if (strcmp(line, name) == 0) { 522 found = 1; 523 break; 524 } 525 } 526 (void) fclose(fd); 527 } 528 return (found); 529 } 530 531 /* 532 * Determine whether a user has access, based on information in 533 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 534 * `allow' or `deny' (with deny being the default if anything but 535 * `allow', or nothing at all, is specified). 536 * 537 * Each glob is matched against the username in turn, and the first 538 * match found is used. If no match is found, access is allowed. 539 * 540 * Any line starting with `#' is considered a comment and ignored. 541 * 542 * This is probably not the best way to do this, but it preserves 543 * the old semantics where if a user was listed in the file he was 544 * denied, otherwise he was allowed. 545 * 546 * There is one change in the semantics, however; ftpd will now `fail 547 * safe' and deny all access if there's no /etc/ftpusers file. 548 * 549 * Return 1 if the user is denied, or 0 if he is allowed. 550 */ 551 static int 552 checkaccess(name) 553 char *name; 554 { 555 #define ALLOWED 0 556 #define NOT_ALLOWED 1 557 FILE *fd; 558 int retval = ALLOWED; 559 char *glob, *perm, line[BUFSIZ]; 560 561 if ((fd = fopen(conffilename(_PATH_FTPUSERS), "r")) == NULL) 562 return NOT_ALLOWED; 563 564 while (fgets(line, sizeof(line), fd) != NULL) { 565 glob = strtok(line, " \t\n"); 566 if (glob[0] == '#') 567 continue; 568 perm = strtok(NULL, " \t\n"); 569 if (fnmatch(glob, name, 0) == 0) { 570 if (perm != NULL && strcmp(perm, "allow") == 0) 571 retval = ALLOWED; 572 else 573 retval = NOT_ALLOWED; 574 break; 575 } 576 } 577 (void) fclose(fd); 578 return (retval); 579 } 580 #undef ALLOWED 581 #undef NOT_ALLOWED 582 583 /* 584 * Terminate login as previous user, if any, resetting state; 585 * used when USER command is given or login fails. 586 */ 587 static void 588 end_login() 589 { 590 591 (void) seteuid((uid_t)0); 592 if (logged_in) 593 logwtmp(ttyline, "", ""); 594 pw = NULL; 595 logged_in = 0; 596 guest = 0; 597 dochroot = 0; 598 } 599 600 void 601 pass(passwd) 602 char *passwd; 603 { 604 int rval; 605 FILE *fd; 606 char *cp, *shell; 607 608 if (logged_in || askpasswd == 0) { 609 reply(503, "Login with USER first."); 610 return; 611 } 612 askpasswd = 0; 613 if (!guest) { /* "ftp" is only account allowed no password */ 614 if (pw == NULL) { 615 rval = 1; /* failure below */ 616 goto skip; 617 } 618 #ifdef KERBEROS 619 if (klogin(pw, "", hostname, passwd) == 0) { 620 rval = 0; 621 goto skip; 622 } 623 #endif 624 #ifdef KERBEROS5 625 if (klogin(pw, "", hostname, passwd) == 0) { 626 rval = 0; 627 goto skip; 628 } 629 #endif 630 #ifdef SKEY 631 if (skey_haskey(pw->pw_name) == 0 && 632 skey_passcheck(pw->pw_name, passwd) != -1) { 633 rval = 0; 634 goto skip; 635 } 636 #endif 637 if (*pw->pw_passwd != '\0' && 638 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 639 rval = 0; 640 goto skip; 641 } 642 rval = 1; 643 644 skip: 645 /* 646 * If rval == 1, the user failed the authentication check 647 * above. If rval == 0, either Kerberos or local authentication 648 * succeeded. 649 */ 650 if (rval) { 651 reply(530, "Login incorrect."); 652 if (logging) { 653 syslog(LOG_NOTICE, 654 "FTP LOGIN FAILED FROM %s", remotehost); 655 syslog(LOG_AUTHPRIV | LOG_NOTICE, 656 "FTP LOGIN FAILED FROM %s, %s", 657 remotehost, curname); 658 } 659 pw = NULL; 660 if (login_attempts++ >= 5) { 661 syslog(LOG_NOTICE, 662 "repeated login failures from %s", 663 remotehost); 664 exit(0); 665 } 666 return; 667 } 668 } 669 670 /* password was ok; see if anything else prevents login */ 671 if (checkaccess(pw->pw_name)) { 672 reply(530, "User %s may not use FTP.", pw->pw_name); 673 if (logging) 674 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 675 remotehost, pw->pw_name); 676 pw = (struct passwd *) NULL; 677 return; 678 } 679 /* check for valid shell, if not guest user */ 680 if ((shell = pw->pw_shell) == NULL || *shell == 0) 681 shell = _PATH_BSHELL; 682 while ((cp = getusershell()) != NULL) 683 if (strcmp(cp, shell) == 0) 684 break; 685 endusershell(); 686 if (cp == NULL && guest == 0) { 687 reply(530, "User %s may not use FTP.", pw->pw_name); 688 if (logging) 689 syslog(LOG_NOTICE, 690 "FTP LOGIN REFUSED FROM %s, %s", 691 remotehost, pw->pw_name); 692 pw = (struct passwd *) NULL; 693 return; 694 } 695 696 login_attempts = 0; /* this time successful */ 697 if (setegid((gid_t)pw->pw_gid) < 0) { 698 reply(550, "Can't set gid."); 699 return; 700 } 701 (void) initgroups(pw->pw_name, pw->pw_gid); 702 703 /* open wtmp before chroot */ 704 logwtmp(ttyline, pw->pw_name, remotehost); 705 logged_in = 1; 706 707 dochroot = checkuser(conffilename(_PATH_FTPCHROOT), pw->pw_name); 708 709 /* parse ftpd.conf, setting up various parameters */ 710 if (guest) 711 parse_conf(CLASS_GUEST); 712 else if (dochroot) 713 parse_conf(CLASS_CHROOT); 714 else 715 parse_conf(CLASS_REAL); 716 717 if (guest) { 718 /* 719 * We MUST do a chdir() after the chroot. Otherwise 720 * the old current directory will be accessible as "." 721 * outside the new root! 722 */ 723 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 724 chdir("/") < 0) { 725 reply(550, "Can't set guest privileges."); 726 goto bad; 727 } 728 } else if (dochroot) { 729 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 730 reply(550, "Can't change root."); 731 goto bad; 732 } 733 } else if (chdir(pw->pw_dir) < 0) { 734 if (chdir("/") < 0) { 735 reply(530, "User %s: can't change directory to %s.", 736 pw->pw_name, pw->pw_dir); 737 goto bad; 738 } else 739 lreply(230, "No directory! Logging in with home=/"); 740 } 741 if (seteuid((uid_t)pw->pw_uid) < 0) { 742 reply(550, "Can't set uid."); 743 goto bad; 744 } 745 /* 746 * Display a login message, if it exists. 747 * N.B. reply(230,) must follow the message. 748 */ 749 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 750 char *cp, line[LINE_MAX]; 751 752 while (fgets(line, sizeof(line), fd) != NULL) { 753 if ((cp = strchr(line, '\n')) != NULL) 754 *cp = '\0'; 755 lreply(230, "%s", line); 756 } 757 (void) fflush(stdout); 758 (void) fclose(fd); 759 } 760 show_chdir_messages(230); 761 if (guest) { 762 reply(230, "Guest login ok, access restrictions apply."); 763 #ifdef HASSETPROCTITLE 764 snprintf(proctitle, sizeof(proctitle), 765 "%s: anonymous/%.*s", remotehost, 766 (int) (sizeof(proctitle) - sizeof(remotehost) - 767 sizeof(": anonymous/")), passwd); 768 setproctitle(proctitle); 769 #endif /* HASSETPROCTITLE */ 770 if (logging) 771 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 772 remotehost, passwd); 773 } else { 774 reply(230, "User %s logged in.", pw->pw_name); 775 #ifdef HASSETPROCTITLE 776 snprintf(proctitle, sizeof(proctitle), 777 "%s: %s", remotehost, pw->pw_name); 778 setproctitle(proctitle); 779 #endif /* HASSETPROCTITLE */ 780 if (logging) 781 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 782 remotehost, pw->pw_name); 783 } 784 (void) umask(curclass.umask); 785 return; 786 bad: 787 /* Forget all about it... */ 788 end_login(); 789 } 790 791 void 792 retrieve(cmd, name) 793 char *cmd, *name; 794 { 795 FILE *fin = NULL, *dout; 796 struct stat st; 797 int (*closefunc) __P((FILE *)) = NULL; 798 int log; 799 800 log = (cmd == 0); 801 if (cmd == 0) { 802 fin = fopen(name, "r"), closefunc = fclose; 803 if (fin == NULL) 804 cmd = do_conversion(name); 805 } 806 if (cmd) { 807 char line[BUFSIZ]; 808 809 (void)snprintf(line, sizeof(line), cmd, name), name = line; 810 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 811 st.st_size = -1; 812 st.st_blksize = BUFSIZ; 813 } 814 if (fin == NULL) { 815 if (errno != 0) { 816 perror_reply(550, name); 817 if (log) { 818 LOGCMD("get", name); 819 } 820 } 821 return; 822 } 823 byte_count = -1; 824 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 825 reply(550, "%s: not a plain file.", name); 826 goto done; 827 } 828 if (restart_point) { 829 if (type == TYPE_A) { 830 off_t i, n; 831 int c; 832 833 n = restart_point; 834 i = 0; 835 while (i++ < n) { 836 if ((c=getc(fin)) == EOF) { 837 perror_reply(550, name); 838 goto done; 839 } 840 if (c == '\n') 841 i++; 842 } 843 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 844 perror_reply(550, name); 845 goto done; 846 } 847 } 848 dout = dataconn(name, st.st_size, "w"); 849 if (dout == NULL) 850 goto done; 851 send_data(fin, dout, st.st_blksize); 852 (void) fclose(dout); 853 data = -1; 854 pdata = -1; 855 done: 856 if (log) 857 LOGBYTES("get", name, byte_count); 858 (*closefunc)(fin); 859 } 860 861 void 862 store(name, mode, unique) 863 char *name, *mode; 864 int unique; 865 { 866 FILE *fout, *din; 867 struct stat st; 868 int (*closefunc) __P((FILE *)); 869 870 if (unique && stat(name, &st) == 0 && 871 (name = gunique(name)) == NULL) { 872 LOGCMD(*mode == 'w' ? "put" : "append", name); 873 return; 874 } 875 876 if (restart_point) 877 mode = "r+"; 878 fout = fopen(name, mode); 879 closefunc = fclose; 880 if (fout == NULL) { 881 perror_reply(553, name); 882 LOGCMD(*mode == 'w' ? "put" : "append", name); 883 return; 884 } 885 byte_count = -1; 886 if (restart_point) { 887 if (type == TYPE_A) { 888 off_t i, n; 889 int c; 890 891 n = restart_point; 892 i = 0; 893 while (i++ < n) { 894 if ((c=getc(fout)) == EOF) { 895 perror_reply(550, name); 896 goto done; 897 } 898 if (c == '\n') 899 i++; 900 } 901 /* 902 * We must do this seek to "current" position 903 * because we are changing from reading to 904 * writing. 905 */ 906 if (fseek(fout, 0L, SEEK_CUR) < 0) { 907 perror_reply(550, name); 908 goto done; 909 } 910 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 911 perror_reply(550, name); 912 goto done; 913 } 914 } 915 din = dataconn(name, (off_t)-1, "r"); 916 if (din == NULL) 917 goto done; 918 if (receive_data(din, fout) == 0) { 919 if (unique) 920 reply(226, "Transfer complete (unique file name:%s).", 921 name); 922 else 923 reply(226, "Transfer complete."); 924 } 925 (void) fclose(din); 926 data = -1; 927 pdata = -1; 928 done: 929 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 930 (*closefunc)(fout); 931 } 932 933 static FILE * 934 getdatasock(mode) 935 char *mode; 936 { 937 int on = 1, s, t, tries; 938 939 if (data >= 0) 940 return (fdopen(data, mode)); 941 (void) seteuid((uid_t)0); 942 s = socket(AF_INET, SOCK_STREAM, 0); 943 if (s < 0) 944 goto bad; 945 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 946 (char *) &on, sizeof(on)) < 0) 947 goto bad; 948 /* anchor socket to avoid multi-homing problems */ 949 data_source.sin_len = sizeof(struct sockaddr_in); 950 data_source.sin_family = AF_INET; 951 data_source.sin_addr = ctrl_addr.sin_addr; 952 for (tries = 1; ; tries++) { 953 if (bind(s, (struct sockaddr *)&data_source, 954 sizeof(data_source)) >= 0) 955 break; 956 if (errno != EADDRINUSE || tries > 10) 957 goto bad; 958 sleep(tries); 959 } 960 (void) seteuid((uid_t)pw->pw_uid); 961 #ifdef IP_TOS 962 on = IPTOS_THROUGHPUT; 963 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 964 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 965 #endif 966 return (fdopen(s, mode)); 967 bad: 968 /* Return the real value of errno (close may change it) */ 969 t = errno; 970 (void) seteuid((uid_t)pw->pw_uid); 971 (void) close(s); 972 errno = t; 973 return (NULL); 974 } 975 976 static FILE * 977 dataconn(name, size, mode) 978 char *name; 979 off_t size; 980 char *mode; 981 { 982 char sizebuf[32]; 983 FILE *file; 984 int retry = 0, tos; 985 986 file_size = size; 987 byte_count = 0; 988 if (size != (off_t) -1) 989 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 990 (long long)size); 991 else 992 sizebuf[0] = '\0'; 993 if (pdata >= 0) { 994 struct sockaddr_in from; 995 int s, fromlen = sizeof(from); 996 997 (void) alarm(curclass.timeout); 998 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 999 (void) alarm(0); 1000 if (s < 0) { 1001 reply(425, "Can't open data connection."); 1002 (void) close(pdata); 1003 pdata = -1; 1004 return (NULL); 1005 } 1006 (void) close(pdata); 1007 pdata = s; 1008 #ifdef IP_TOS 1009 tos = IPTOS_THROUGHPUT; 1010 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1011 sizeof(int)); 1012 #endif 1013 reply(150, "Opening %s mode data connection for '%s'%s.", 1014 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1015 return (fdopen(pdata, mode)); 1016 } 1017 if (data >= 0) { 1018 reply(125, "Using existing data connection for '%s'%s.", 1019 name, sizebuf); 1020 usedefault = 1; 1021 return (fdopen(data, mode)); 1022 } 1023 if (usedefault) 1024 data_dest = his_addr; 1025 usedefault = 1; 1026 file = getdatasock(mode); 1027 if (file == NULL) { 1028 reply(425, "Can't create data socket (%s,%d): %s.", 1029 inet_ntoa(data_source.sin_addr), 1030 ntohs(data_source.sin_port), strerror(errno)); 1031 return (NULL); 1032 } 1033 data = fileno(file); 1034 while (connect(data, (struct sockaddr *)&data_dest, 1035 sizeof(data_dest)) < 0) { 1036 if (errno == EADDRINUSE && retry < swaitmax) { 1037 sleep((unsigned) swaitint); 1038 retry += swaitint; 1039 continue; 1040 } 1041 perror_reply(425, "Can't build data connection"); 1042 (void) fclose(file); 1043 data = -1; 1044 return (NULL); 1045 } 1046 reply(150, "Opening %s mode data connection for '%s'%s.", 1047 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1048 return (file); 1049 } 1050 1051 /* 1052 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1053 * encapsulation of the data subject * to Mode, Structure, and Type. 1054 * 1055 * NB: Form isn't handled. 1056 */ 1057 static void 1058 send_data(instr, outstr, blksize) 1059 FILE *instr, *outstr; 1060 off_t blksize; 1061 { 1062 int c, cnt, filefd, netfd; 1063 char *buf; 1064 1065 transflag++; 1066 if (setjmp(urgcatch)) { 1067 transflag = 0; 1068 return; 1069 } 1070 1071 switch (type) { 1072 1073 case TYPE_A: 1074 while ((c = getc(instr)) != EOF) { 1075 byte_count++; 1076 if (c == '\n') { 1077 if (ferror(outstr)) 1078 goto data_err; 1079 (void) putc('\r', outstr); 1080 } 1081 (void) putc(c, outstr); 1082 } 1083 fflush(outstr); 1084 transflag = 0; 1085 if (ferror(instr)) 1086 goto file_err; 1087 if (ferror(outstr)) 1088 goto data_err; 1089 reply(226, "Transfer complete."); 1090 return; 1091 1092 case TYPE_I: 1093 case TYPE_L: 1094 if ((buf = malloc((u_int)blksize)) == NULL) { 1095 transflag = 0; 1096 perror_reply(451, "Local resource failure: malloc"); 1097 return; 1098 } 1099 netfd = fileno(outstr); 1100 filefd = fileno(instr); 1101 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1102 write(netfd, buf, cnt) == cnt) 1103 byte_count += cnt; 1104 transflag = 0; 1105 (void)free(buf); 1106 if (cnt != 0) { 1107 if (cnt < 0) 1108 goto file_err; 1109 goto data_err; 1110 } 1111 reply(226, "Transfer complete."); 1112 return; 1113 default: 1114 transflag = 0; 1115 reply(550, "Unimplemented TYPE %d in send_data", type); 1116 return; 1117 } 1118 1119 data_err: 1120 transflag = 0; 1121 perror_reply(426, "Data connection"); 1122 return; 1123 1124 file_err: 1125 transflag = 0; 1126 perror_reply(551, "Error on input file"); 1127 } 1128 1129 /* 1130 * Transfer data from peer to "outstr" using the appropriate encapulation of 1131 * the data subject to Mode, Structure, and Type. 1132 * 1133 * N.B.: Form isn't handled. 1134 */ 1135 static int 1136 receive_data(instr, outstr) 1137 FILE *instr, *outstr; 1138 { 1139 int c, cnt, bare_lfs; 1140 char buf[BUFSIZ]; 1141 #ifdef __GNUC__ 1142 (void) &bare_lfs; 1143 #endif 1144 1145 bare_lfs = 0; 1146 transflag++; 1147 if (setjmp(urgcatch)) { 1148 transflag = 0; 1149 return (-1); 1150 } 1151 1152 switch (type) { 1153 1154 case TYPE_I: 1155 case TYPE_L: 1156 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1157 if (write(fileno(outstr), buf, cnt) != cnt) 1158 goto file_err; 1159 byte_count += cnt; 1160 } 1161 if (cnt < 0) 1162 goto data_err; 1163 transflag = 0; 1164 return (0); 1165 1166 case TYPE_E: 1167 reply(553, "TYPE E not implemented."); 1168 transflag = 0; 1169 return (-1); 1170 1171 case TYPE_A: 1172 while ((c = getc(instr)) != EOF) { 1173 byte_count++; 1174 if (c == '\n') 1175 bare_lfs++; 1176 while (c == '\r') { 1177 if (ferror(outstr)) 1178 goto data_err; 1179 if ((c = getc(instr)) != '\n') { 1180 (void) putc ('\r', outstr); 1181 if (c == '\0' || c == EOF) 1182 goto contin2; 1183 } 1184 } 1185 (void) putc(c, outstr); 1186 contin2: ; 1187 } 1188 fflush(outstr); 1189 if (ferror(instr)) 1190 goto data_err; 1191 if (ferror(outstr)) 1192 goto file_err; 1193 transflag = 0; 1194 if (bare_lfs) { 1195 lreply(226, 1196 "WARNING! %d bare linefeeds received in ASCII mode", 1197 bare_lfs); 1198 (void)printf(" File may not have transferred correctly.\r\n"); 1199 } 1200 return (0); 1201 default: 1202 reply(550, "Unimplemented TYPE %d in receive_data", type); 1203 transflag = 0; 1204 return (-1); 1205 } 1206 1207 data_err: 1208 transflag = 0; 1209 perror_reply(426, "Data Connection"); 1210 return (-1); 1211 1212 file_err: 1213 transflag = 0; 1214 perror_reply(452, "Error writing file"); 1215 return (-1); 1216 } 1217 1218 void 1219 statfilecmd(filename) 1220 char *filename; 1221 { 1222 FILE *fin; 1223 int c; 1224 char line[LINE_MAX]; 1225 1226 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1227 fin = ftpd_popen(line, "r", 0); 1228 lreply(211, "status of %s:", filename); 1229 while ((c = getc(fin)) != EOF) { 1230 if (c == '\n') { 1231 if (ferror(stdout)){ 1232 perror_reply(421, "control connection"); 1233 (void) ftpd_pclose(fin); 1234 dologout(1); 1235 /* NOTREACHED */ 1236 } 1237 if (ferror(fin)) { 1238 perror_reply(551, filename); 1239 (void) ftpd_pclose(fin); 1240 return; 1241 } 1242 (void) putc('\r', stdout); 1243 } 1244 (void) putc(c, stdout); 1245 } 1246 (void) ftpd_pclose(fin); 1247 reply(211, "End of Status"); 1248 } 1249 1250 void 1251 statcmd() 1252 { 1253 struct sockaddr_in *sin; 1254 u_char *a, *p; 1255 1256 lreply(211, "%s FTP server status:", hostname); 1257 lreply(211, "%s", version); 1258 if (isdigit(remotehost[0])) 1259 lreply(211, "Connected to %s", remotehost); 1260 else 1261 lreply(211, "Connected to %s (%s)", remotehost, 1262 inet_ntoa(his_addr.sin_addr)); 1263 if (logged_in) { 1264 if (guest) 1265 lreply(211, "Logged in anonymously"); 1266 else 1267 lreply(211, "Logged in as %s", pw->pw_name); 1268 } else if (askpasswd) 1269 lreply(211, "Waiting for password"); 1270 else 1271 lreply(211, "Waiting for user name"); 1272 printf("211- TYPE: %s", typenames[type]); 1273 if (type == TYPE_A || type == TYPE_E) 1274 printf(", FORM: %s", formnames[form]); 1275 if (type == TYPE_L) 1276 #if NBBY == 8 1277 printf(" %d", NBBY); 1278 #else 1279 printf(" %d", bytesize); /* need definition! */ 1280 #endif 1281 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1282 strunames[stru], modenames[mode]); 1283 if (data != -1) 1284 lreply(211, "Data connection open"); 1285 else if (pdata != -1) { 1286 printf("211- in Passive mode"); 1287 sin = &pasv_addr; 1288 goto printaddr; 1289 } else if (usedefault == 0) { 1290 printf("211- PORT"); 1291 sin = &data_dest; 1292 printaddr: 1293 a = (u_char *) &sin->sin_addr; 1294 p = (u_char *) &sin->sin_port; 1295 #define UC(b) (((int) b) & 0xff) 1296 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1297 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1298 #undef UC 1299 } else 1300 lreply(211, "No data connection"); 1301 1302 if (logged_in) { 1303 struct ftpconv *cp; 1304 1305 lreply(211, ""); 1306 lreply(211, "Class: %s", curclass.classname); 1307 lreply(211, "Check PORT commands: %sabled", 1308 curclass.checkportcmd ? "en" : "dis"); 1309 if (curclass.display) 1310 lreply(211, "Display file: %s", curclass.display); 1311 if (curclass.notify) 1312 lreply(211, "Notify fileglob: %s", curclass.notify); 1313 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1314 curclass.timeout, curclass.maxtimeout); 1315 lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1316 curclass.modify ? "en" : "dis"); 1317 lreply(211, "Umask: %.04o", curclass.umask); 1318 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1319 if (cp->suffix == NULL || cp->types == NULL || 1320 cp->command == NULL) 1321 continue; 1322 lreply(211, 1323 "Conversion: %s [%s] disable: %s, command: %s", 1324 cp->suffix, cp->types, cp->disable, cp->command); 1325 } 1326 } 1327 1328 reply(211, "End of status"); 1329 } 1330 1331 void 1332 fatal(s) 1333 char *s; 1334 { 1335 1336 reply(451, "Error in server: %s\n", s); 1337 reply(221, "Closing connection due to server error."); 1338 dologout(0); 1339 /* NOTREACHED */ 1340 } 1341 1342 void 1343 #if __STDC__ 1344 reply(int n, const char *fmt, ...) 1345 #else 1346 reply(n, fmt, va_alist) 1347 int n; 1348 char *fmt; 1349 va_dcl 1350 #endif 1351 { 1352 va_list ap; 1353 #if __STDC__ 1354 va_start(ap, fmt); 1355 #else 1356 va_start(ap); 1357 #endif 1358 (void)printf("%d ", n); 1359 (void)vprintf(fmt, ap); 1360 (void)printf("\r\n"); 1361 (void)fflush(stdout); 1362 if (debug) { 1363 syslog(LOG_DEBUG, "<--- %d ", n); 1364 vsyslog(LOG_DEBUG, fmt, ap); 1365 } 1366 } 1367 1368 void 1369 #if __STDC__ 1370 lreply(int n, const char *fmt, ...) 1371 #else 1372 lreply(n, fmt, va_alist) 1373 int n; 1374 char *fmt; 1375 va_dcl 1376 #endif 1377 { 1378 va_list ap; 1379 #if __STDC__ 1380 va_start(ap, fmt); 1381 #else 1382 va_start(ap); 1383 #endif 1384 (void)printf("%d- ", n); 1385 (void)vprintf(fmt, ap); 1386 (void)printf("\r\n"); 1387 (void)fflush(stdout); 1388 if (debug) { 1389 syslog(LOG_DEBUG, "<--- %d- ", n); 1390 vsyslog(LOG_DEBUG, fmt, ap); 1391 } 1392 } 1393 1394 static void 1395 ack(s) 1396 char *s; 1397 { 1398 1399 reply(250, "%s command successful.", s); 1400 } 1401 1402 void 1403 nack(s) 1404 char *s; 1405 { 1406 1407 reply(502, "%s command not implemented.", s); 1408 } 1409 1410 /* ARGSUSED */ 1411 void 1412 yyerror(s) 1413 char *s; 1414 { 1415 char *cp; 1416 1417 if ((cp = strchr(cbuf,'\n')) != NULL) 1418 *cp = '\0'; 1419 reply(500, "'%s': command not understood.", cbuf); 1420 } 1421 1422 void 1423 delete(name) 1424 char *name; 1425 { 1426 1427 LOGCMD("delete", name); 1428 if (remove(name) < 0) 1429 perror_reply(550, name); 1430 else 1431 ack("DELE"); 1432 } 1433 1434 void 1435 cwd(path) 1436 char *path; 1437 { 1438 1439 if (chdir(path) < 0) 1440 perror_reply(550, path); 1441 else { 1442 show_chdir_messages(250); 1443 ack("CWD"); 1444 } 1445 } 1446 1447 static void 1448 replydirname(name, message) 1449 const char *name, *message; 1450 { 1451 char npath[MAXPATHLEN + 1]; 1452 int i; 1453 1454 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1455 npath[i] = *name; 1456 if (*name == '"') 1457 npath[++i] = '"'; 1458 } 1459 npath[i] = '\0'; 1460 reply(257, "\"%s\" %s", npath, message); 1461 } 1462 1463 void 1464 makedir(name) 1465 char *name; 1466 { 1467 1468 LOGCMD("mkdir", name); 1469 if (mkdir(name, 0777) < 0) 1470 perror_reply(550, name); 1471 else 1472 replydirname(name, "directory created."); 1473 } 1474 1475 void 1476 removedir(name) 1477 char *name; 1478 { 1479 1480 LOGCMD("rmdir", name); 1481 if (rmdir(name) < 0) 1482 perror_reply(550, name); 1483 else 1484 ack("RMD"); 1485 } 1486 1487 void 1488 pwd() 1489 { 1490 char path[MAXPATHLEN + 1]; 1491 1492 if (getcwd(path, sizeof(path) - 1) == NULL) 1493 reply(550, "%s.", path); 1494 else 1495 replydirname(path, "is the current directory."); 1496 } 1497 1498 char * 1499 renamefrom(name) 1500 char *name; 1501 { 1502 struct stat st; 1503 1504 if (stat(name, &st) < 0) { 1505 perror_reply(550, name); 1506 return ((char *)0); 1507 } 1508 reply(350, "File exists, ready for destination name"); 1509 return (name); 1510 } 1511 1512 void 1513 renamecmd(from, to) 1514 char *from, *to; 1515 { 1516 1517 LOGCMD2("rename", from, to); 1518 if (rename(from, to) < 0) 1519 perror_reply(550, "rename"); 1520 else 1521 ack("RNTO"); 1522 } 1523 1524 static void 1525 dolog(sin) 1526 struct sockaddr_in *sin; 1527 { 1528 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1529 sizeof(struct in_addr), AF_INET); 1530 1531 if (hp) 1532 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1533 else 1534 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1535 sizeof(remotehost)); 1536 #ifdef HASSETPROCTITLE 1537 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1538 setproctitle(proctitle); 1539 #endif /* HASSETPROCTITLE */ 1540 1541 if (logging) 1542 syslog(LOG_INFO, "connection from %s", remotehost); 1543 } 1544 1545 /* 1546 * Record logout in wtmp file 1547 * and exit with supplied status. 1548 */ 1549 void 1550 dologout(status) 1551 int status; 1552 { 1553 /* 1554 * Prevent reception of SIGURG from resulting in a resumption 1555 * back to the main program loop. 1556 */ 1557 transflag = 0; 1558 1559 if (logged_in) { 1560 (void) seteuid((uid_t)0); 1561 logwtmp(ttyline, "", ""); 1562 #ifdef KERBEROS 1563 if (!notickets && krbtkfile_env) 1564 unlink(krbtkfile_env); 1565 #endif 1566 } 1567 /* beware of flushing buffers after a SIGPIPE */ 1568 _exit(status); 1569 } 1570 1571 static void 1572 myoob(signo) 1573 int signo; 1574 { 1575 char *cp; 1576 1577 /* only process if transfer occurring */ 1578 if (!transflag) 1579 return; 1580 cp = tmpline; 1581 if (getline(cp, 7, stdin) == NULL) { 1582 reply(221, "You could at least say goodbye."); 1583 dologout(0); 1584 } 1585 upper(cp); 1586 if (strcmp(cp, "ABOR\r\n") == 0) { 1587 tmpline[0] = '\0'; 1588 reply(426, "Transfer aborted. Data connection closed."); 1589 reply(226, "Abort successful"); 1590 longjmp(urgcatch, 1); 1591 } 1592 if (strcmp(cp, "STAT\r\n") == 0) { 1593 if (file_size != (off_t) -1) 1594 reply(213, "Status: %qd of %qd bytes transferred", 1595 byte_count, file_size); 1596 else 1597 reply(213, "Status: %qd bytes transferred", byte_count); 1598 } 1599 } 1600 1601 /* 1602 * Note: a response of 425 is not mentioned as a possible response to 1603 * the PASV command in RFC959. However, it has been blessed as 1604 * a legitimate response by Jon Postel in a telephone conversation 1605 * with Rick Adams on 25 Jan 89. 1606 */ 1607 void 1608 passive() 1609 { 1610 int len; 1611 char *p, *a; 1612 1613 pdata = socket(AF_INET, SOCK_STREAM, 0); 1614 if (pdata < 0 || !logged_in) { 1615 perror_reply(425, "Can't open passive connection"); 1616 return; 1617 } 1618 pasv_addr = ctrl_addr; 1619 pasv_addr.sin_port = 0; 1620 (void) seteuid((uid_t)0); 1621 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1622 (void) seteuid((uid_t)pw->pw_uid); 1623 goto pasv_error; 1624 } 1625 (void) seteuid((uid_t)pw->pw_uid); 1626 len = sizeof(pasv_addr); 1627 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1628 goto pasv_error; 1629 if (listen(pdata, 1) < 0) 1630 goto pasv_error; 1631 a = (char *) &pasv_addr.sin_addr; 1632 p = (char *) &pasv_addr.sin_port; 1633 1634 #define UC(b) (((int) b) & 0xff) 1635 1636 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1637 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1638 return; 1639 1640 pasv_error: 1641 (void) close(pdata); 1642 pdata = -1; 1643 perror_reply(425, "Can't open passive connection"); 1644 return; 1645 } 1646 1647 /* 1648 * Generate unique name for file with basename "local". 1649 * The file named "local" is already known to exist. 1650 * Generates failure reply on error. 1651 * 1652 * XXX this function should under go changes similar to 1653 * the mktemp(3)/mkstemp(3) changes. 1654 */ 1655 static char * 1656 gunique(local) 1657 char *local; 1658 { 1659 static char new[MAXPATHLEN]; 1660 struct stat st; 1661 int count, len; 1662 char *cp; 1663 1664 cp = strrchr(local, '/'); 1665 if (cp) 1666 *cp = '\0'; 1667 if (stat(cp ? local : ".", &st) < 0) { 1668 perror_reply(553, cp ? local : "."); 1669 return ((char *) 0); 1670 } 1671 if (cp) 1672 *cp = '/'; 1673 (void) strcpy(new, local); 1674 len = strlen(new); 1675 cp = new + len; 1676 *cp++ = '.'; 1677 for (count = 1; count < 100; count++) { 1678 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1679 if (stat(new, &st) < 0) 1680 return (new); 1681 } 1682 reply(452, "Unique file name cannot be created."); 1683 return (NULL); 1684 } 1685 1686 /* 1687 * Format and send reply containing system error number. 1688 */ 1689 void 1690 perror_reply(code, string) 1691 int code; 1692 char *string; 1693 { 1694 1695 reply(code, "%s: %s.", string, strerror(errno)); 1696 } 1697 1698 static char *onefile[] = { 1699 "", 1700 0 1701 }; 1702 1703 void 1704 send_file_list(whichf) 1705 char *whichf; 1706 { 1707 struct stat st; 1708 DIR *dirp = NULL; 1709 struct dirent *dir; 1710 FILE *dout = NULL; 1711 char **dirlist, *dirname; 1712 int simple = 0; 1713 int freeglob = 0; 1714 glob_t gl; 1715 #ifdef __GNUC__ 1716 (void) &dout; 1717 (void) &dirlist; 1718 (void) &simple; 1719 (void) &freeglob; 1720 #endif 1721 1722 if (strpbrk(whichf, "~{[*?") != NULL) { 1723 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1724 1725 memset(&gl, 0, sizeof(gl)); 1726 freeglob = 1; 1727 if (glob(whichf, flags, 0, &gl)) { 1728 reply(550, "not found"); 1729 goto out; 1730 } else if (gl.gl_pathc == 0) { 1731 errno = ENOENT; 1732 perror_reply(550, whichf); 1733 goto out; 1734 } 1735 dirlist = gl.gl_pathv; 1736 } else { 1737 onefile[0] = whichf; 1738 dirlist = onefile; 1739 simple = 1; 1740 } 1741 1742 if (setjmp(urgcatch)) { 1743 transflag = 0; 1744 goto out; 1745 } 1746 while ((dirname = *dirlist++) != NULL) { 1747 int trailingslash = 0; 1748 1749 if (stat(dirname, &st) < 0) { 1750 /* 1751 * If user typed "ls -l", etc, and the client 1752 * used NLST, do what the user meant. 1753 */ 1754 if (dirname[0] == '-' && *dirlist == NULL && 1755 transflag == 0) { 1756 retrieve("/bin/ls %s", dirname); 1757 goto out; 1758 } 1759 perror_reply(550, whichf); 1760 if (dout != NULL) { 1761 (void) fclose(dout); 1762 transflag = 0; 1763 data = -1; 1764 pdata = -1; 1765 } 1766 goto out; 1767 } 1768 1769 if (S_ISREG(st.st_mode)) { 1770 if (dout == NULL) { 1771 dout = dataconn("file list", (off_t)-1, "w"); 1772 if (dout == NULL) 1773 goto out; 1774 transflag++; 1775 } 1776 fprintf(dout, "%s%s\n", dirname, 1777 type == TYPE_A ? "\r" : ""); 1778 byte_count += strlen(dirname) + 1; 1779 continue; 1780 } else if (!S_ISDIR(st.st_mode)) 1781 continue; 1782 1783 if (dirname[strlen(dirname) - 1] == '/') 1784 trailingslash++; 1785 1786 if ((dirp = opendir(dirname)) == NULL) 1787 continue; 1788 1789 while ((dir = readdir(dirp)) != NULL) { 1790 char nbuf[MAXPATHLEN]; 1791 1792 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1793 continue; 1794 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1795 dir->d_namlen == 2) 1796 continue; 1797 1798 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1799 trailingslash ? "" : "/", dir->d_name); 1800 1801 /* 1802 * We have to do a stat to ensure it's 1803 * not a directory or special file. 1804 */ 1805 if (simple || (stat(nbuf, &st) == 0 && 1806 S_ISREG(st.st_mode))) { 1807 if (dout == NULL) { 1808 dout = dataconn("file list", (off_t)-1, 1809 "w"); 1810 if (dout == NULL) 1811 goto out; 1812 transflag++; 1813 } 1814 if (nbuf[0] == '.' && nbuf[1] == '/') 1815 fprintf(dout, "%s%s\n", &nbuf[2], 1816 type == TYPE_A ? "\r" : ""); 1817 else 1818 fprintf(dout, "%s%s\n", nbuf, 1819 type == TYPE_A ? "\r" : ""); 1820 byte_count += strlen(nbuf) + 1; 1821 } 1822 } 1823 (void) closedir(dirp); 1824 } 1825 1826 if (dout == NULL) 1827 reply(550, "No files found."); 1828 else if (ferror(dout) != 0) 1829 perror_reply(550, "Data connection"); 1830 else 1831 reply(226, "Transfer complete."); 1832 1833 transflag = 0; 1834 if (dout != NULL) 1835 (void) fclose(dout); 1836 data = -1; 1837 pdata = -1; 1838 out: 1839 if (freeglob) { 1840 freeglob = 0; 1841 globfree(&gl); 1842 } 1843 } 1844 1845 char * 1846 conffilename(s) 1847 const char *s; 1848 { 1849 static char filename[MAXPATHLEN]; 1850 1851 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1852 return filename; 1853 } 1854
Indexes created Wed Sep 24 05:09:52 GMT 2025