ftpd.c revision 1.32
1/* $OpenBSD: ftpd.c,v 1.32 1997/01/23 06:49:11 deraadt Exp $ */ 2/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ 3 4/* 5 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static char 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 45static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 46#else 47static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 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#include <sys/mman.h> 60 61#include <netinet/in.h> 62#include <netinet/in_systm.h> 63#include <netinet/ip.h> 64#include <netinet/tcp.h> 65 66#define FTP_NAMES 67#include <arpa/ftp.h> 68#include <arpa/inet.h> 69#include <arpa/telnet.h> 70 71#include <ctype.h> 72#include <dirent.h> 73#include <err.h> 74#include <errno.h> 75#include <fcntl.h> 76#include <glob.h> 77#include <limits.h> 78#include <netdb.h> 79#include <pwd.h> 80#include <setjmp.h> 81#include <signal.h> 82#include <stdio.h> 83#include <stdlib.h> 84#include <string.h> 85#include <syslog.h> 86#include <time.h> 87#include <vis.h> 88#include <unistd.h> 89#include <utmp.h> 90 91#include "pathnames.h" 92#include "extern.h" 93 94#if __STDC__ 95#include <stdarg.h> 96#else 97#include <varargs.h> 98#endif 99 100static char version[] = "Version 6.2/OpenBSD"; 101 102extern off_t restart_point; 103extern char cbuf[]; 104 105struct sockaddr_in server_addr; 106struct sockaddr_in ctrl_addr; 107struct sockaddr_in data_source; 108struct sockaddr_in data_dest; 109struct sockaddr_in his_addr; 110struct sockaddr_in pasv_addr; 111 112int daemon_mode = 0; 113int data; 114jmp_buf errcatch, urgcatch; 115int logged_in; 116struct passwd *pw; 117int debug = 0; 118int timeout = 900; /* timeout after 15 minutes of inactivity */ 119int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 120int logging; 121int high_data_ports = 0; 122int anon_only = 0; 123int multihome = 0; 124int guest; 125int stats; 126int statfd = -1; 127int dochroot; 128int type; 129int form; 130int stru; /* avoid C keyword */ 131int mode; 132int doutmp = 0; /* update utmp file */ 133int usedefault = 1; /* for data transfers */ 134int pdata = -1; /* for passive mode */ 135sig_atomic_t transflag; 136off_t file_size; 137off_t byte_count; 138#if !defined(CMASK) || CMASK == 0 139#undef CMASK 140#define CMASK 027 141#endif 142int defumask = CMASK; /* default umask value */ 143char tmpline[7]; 144char hostname[MAXHOSTNAMELEN]; 145char remotehost[MAXHOSTNAMELEN]; 146char dhostname[MAXHOSTNAMELEN]; 147char *guestpw; 148static char ttyline[20]; 149char *tty = ttyline; /* for klogin */ 150static struct utmp utmp; /* for utmp */ 151 152#if defined(KERBEROS) 153int notickets = 1; 154char *krbtkfile_env = NULL; 155#endif 156 157char *ident = NULL; 158 159 160/* 161 * Timeout intervals for retrying connections 162 * to hosts that don't accept PORT cmds. This 163 * is a kludge, but given the problems with TCP... 164 */ 165#define SWAITMAX 90 /* wait at most 90 seconds */ 166#define SWAITINT 5 /* interval between retries */ 167 168int swaitmax = SWAITMAX; 169int swaitint = SWAITINT; 170 171#ifdef HASSETPROCTITLE 172char proctitle[BUFSIZ]; /* initial part of title */ 173#endif /* HASSETPROCTITLE */ 174 175#define LOGCMD(cmd, file) \ 176 if (logging > 1) \ 177 syslog(LOG_INFO,"%s %s%s", cmd, \ 178 *(file) == '/' ? "" : curdir(), file); 179#define LOGCMD2(cmd, file1, file2) \ 180 if (logging > 1) \ 181 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 182 *(file1) == '/' ? "" : curdir(), file1, \ 183 *(file2) == '/' ? "" : curdir(), file2); 184#define LOGBYTES(cmd, file, cnt) \ 185 if (logging > 1) { \ 186 if (cnt == (off_t)-1) \ 187 syslog(LOG_INFO,"%s %s%s", cmd, \ 188 *(file) == '/' ? "" : curdir(), file); \ 189 else \ 190 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 191 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 192 } 193 194static void ack __P((char *)); 195static void myoob __P((int)); 196static int checkuser __P((char *, char *)); 197static FILE *dataconn __P((char *, off_t, char *)); 198static void dolog __P((struct sockaddr_in *)); 199static char *curdir __P((void)); 200static void end_login __P((void)); 201static FILE *getdatasock __P((char *)); 202static int guniquefd __P((char *, char **)); 203static void lostconn __P((int)); 204static void sigquit __P((int)); 205static int receive_data __P((FILE *, FILE *)); 206static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 207static struct passwd * 208 sgetpwnam __P((char *)); 209static char *sgetsave __P((char *)); 210static void reapchild __P((int)); 211 212void logxfer __P((char *, off_t, time_t)); 213 214static char * 215curdir() 216{ 217 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 218 219 if (getcwd(path, sizeof(path)-2) == NULL) 220 return (""); 221 if (path[1] != '\0') /* special case for root dir. */ 222 strcat(path, "/"); 223 /* For guest account, skip / since it's chrooted */ 224 return (guest ? path+1 : path); 225} 226 227int 228main(argc, argv, envp) 229 int argc; 230 char *argv[]; 231 char **envp; 232{ 233 int addrlen, ch, on = 1, tos; 234 char *cp, line[LINE_MAX]; 235 FILE *fd; 236 char *argstr = "AdDhlMSt:T:u:Uv"; 237 struct hostent *hp; 238 239 tzset(); /* in case no timezone database in ~ftp */ 240 241 /* set this here so klogin can use it... */ 242 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 243 244 while ((ch = getopt(argc, argv, argstr)) != -1) { 245 switch (ch) { 246 case 'A': 247 anon_only = 1; 248 break; 249 250 case 'd': 251 debug = 1; 252 break; 253 254 case 'D': 255 daemon_mode = 1; 256 break; 257 258 case 'h': 259 high_data_ports = 1; 260 break; 261 262 case 'l': 263 logging++; /* > 1 == extra logging */ 264 break; 265 266 case 'M': 267 multihome = 1; 268 break; 269 270 case 'S': 271 stats = 1; 272 break; 273 274 case 't': 275 timeout = atoi(optarg); 276 if (maxtimeout < timeout) 277 maxtimeout = timeout; 278 break; 279 280 case 'T': 281 maxtimeout = atoi(optarg); 282 if (timeout > maxtimeout) 283 timeout = maxtimeout; 284 break; 285 286 case 'u': 287 { 288 long val = 0; 289 290 val = strtol(optarg, &optarg, 8); 291 if (*optarg != '\0' || val < 0) 292 warnx("bad value for -u"); 293 else 294 defumask = val; 295 break; 296 } 297 298 case 'U': 299 doutmp = 1; 300 break; 301 302 case 'v': 303 debug = 1; 304 break; 305 306 default: 307 warnx("unknown flag -%c ignored", optopt); 308 break; 309 } 310 } 311 312 (void) freopen(_PATH_DEVNULL, "w", stderr); 313 314 /* 315 * LOG_NDELAY sets up the logging connection immediately, 316 * necessary for anonymous ftp's that chroot and can't do it later. 317 */ 318 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 319 320 if (daemon_mode) { 321 int ctl_sock, fd; 322 struct servent *sv; 323 324 /* 325 * Detach from parent. 326 */ 327 if (daemon(1, 1) < 0) { 328 syslog(LOG_ERR, "failed to become a daemon"); 329 exit(1); 330 } 331 (void) signal(SIGCHLD, reapchild); 332 /* 333 * Get port number for ftp/tcp. 334 */ 335 sv = getservbyname("ftp", "tcp"); 336 if (sv == NULL) { 337 syslog(LOG_ERR, "getservbyname for ftp failed"); 338 exit(1); 339 } 340 /* 341 * Open a socket, bind it to the FTP port, and start 342 * listening. 343 */ 344 ctl_sock = socket(AF_INET, SOCK_STREAM, 0); 345 if (ctl_sock < 0) { 346 syslog(LOG_ERR, "control socket: %m"); 347 exit(1); 348 } 349 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 350 (char *)&on, sizeof(on)) < 0) 351 syslog(LOG_ERR, "control setsockopt: %m");; 352 server_addr.sin_family = AF_INET; 353 server_addr.sin_addr.s_addr = INADDR_ANY; 354 server_addr.sin_port = sv->s_port; 355 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 356 sizeof(server_addr))) { 357 syslog(LOG_ERR, "control bind: %m"); 358 exit(1); 359 } 360 if (listen(ctl_sock, 32) < 0) { 361 syslog(LOG_ERR, "control listen: %m"); 362 exit(1); 363 } 364 /* 365 * Loop forever accepting connection requests and forking off 366 * children to handle them. 367 */ 368 while (1) { 369 addrlen = sizeof(his_addr); 370 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 371 &addrlen); 372 if (fork() == 0) { 373 /* child */ 374 (void) dup2(fd, 0); 375 (void) dup2(fd, 1); 376 close(ctl_sock); 377 break; 378 } 379 close(fd); 380 } 381 } else { 382 addrlen = sizeof(his_addr); 383 if (getpeername(0, (struct sockaddr *)&his_addr, 384 &addrlen) < 0) { 385 syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); 386 exit(1); 387 } 388 } 389 390 (void) signal(SIGHUP, sigquit); 391 (void) signal(SIGINT, sigquit); 392 (void) signal(SIGQUIT, sigquit); 393 (void) signal(SIGTERM, sigquit); 394 (void) signal(SIGPIPE, lostconn); 395 (void) signal(SIGCHLD, SIG_IGN); 396 if ((long)signal(SIGURG, myoob) < 0) 397 syslog(LOG_ERR, "signal: %m"); 398 399 addrlen = sizeof(ctrl_addr); 400 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 401 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 402 exit(1); 403 } 404#ifdef IP_TOS 405 tos = IPTOS_LOWDELAY; 406 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 407 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 408#endif 409 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 410 411 /* Try to handle urgent data inline */ 412#ifdef SO_OOBINLINE 413 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 414 syslog(LOG_ERR, "setsockopt: %m"); 415#endif 416 417#ifdef F_SETOWN 418 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 419 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 420#endif 421 dolog(&his_addr); 422 /* 423 * Set up default state 424 */ 425 data = -1; 426 type = TYPE_A; 427 form = FORM_N; 428 stru = STRU_F; 429 mode = MODE_S; 430 tmpline[0] = '\0'; 431 432 /* If logins are disabled, print out the message. */ 433 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 434 while (fgets(line, sizeof(line), fd) != NULL) { 435 if ((cp = strchr(line, '\n')) != NULL) 436 *cp = '\0'; 437 lreply(530, "%s", line); 438 } 439 (void) fflush(stdout); 440 (void) fclose(fd); 441 reply(530, "System not available."); 442 exit(0); 443 } 444 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 445 while (fgets(line, sizeof(line), fd) != NULL) { 446 if ((cp = strchr(line, '\n')) != NULL) 447 *cp = '\0'; 448 lreply(220, "%s", line); 449 } 450 (void) fflush(stdout); 451 (void) fclose(fd); 452 /* reply(220,) must follow */ 453 } 454 (void) gethostname(hostname, sizeof(hostname)); 455 456 /* Make sure hostname is fully qualified. */ 457 hp = gethostbyname(hostname); 458 if (hp != NULL) 459 strcpy (hostname, hp->h_name); 460 461 if (multihome) { 462 hp = gethostbyaddr((char *) &ctrl_addr.sin_addr, 463 sizeof (struct in_addr), AF_INET); 464 if (hp != NULL) { 465 strcpy (dhostname, hp->h_name); 466 } else { 467 /* Default. */ 468 strcpy (dhostname, inet_ntoa(ctrl_addr.sin_addr)); 469 } 470 } 471 472 reply(220, "%s FTP server (%s) ready.", 473 (multihome ? dhostname : hostname), version); 474 (void) setjmp(errcatch); 475 for (;;) 476 (void) yyparse(); 477 /* NOTREACHED */ 478} 479 480/* 481 * Signal handlers. 482 */ 483 484static void 485lostconn(signo) 486 int signo; 487{ 488 489 if (debug) 490 syslog(LOG_DEBUG, "lost connection"); 491 dologout(-1); 492} 493 494static void 495sigquit(signo) 496 int signo; 497{ 498 syslog(LOG_ERR, "got signal %s", strsignal(signo)); 499 500 dologout(-1); 501} 502 503/* 504 * Helper function for sgetpwnam(). 505 */ 506static char * 507sgetsave(s) 508 char *s; 509{ 510 char *new = malloc((unsigned) strlen(s) + 1); 511 512 if (new == NULL) { 513 perror_reply(421, "Local resource failure: malloc"); 514 dologout(1); 515 /* NOTREACHED */ 516 } 517 (void) strcpy(new, s); 518 return (new); 519} 520 521/* 522 * Save the result of a getpwnam. Used for USER command, since 523 * the data returned must not be clobbered by any other command 524 * (e.g., globbing). 525 */ 526static struct passwd * 527sgetpwnam(name) 528 char *name; 529{ 530 static struct passwd save; 531 struct passwd *p; 532 533 if ((p = getpwnam(name)) == NULL) 534 return (p); 535 if (save.pw_name) { 536 free(save.pw_name); 537 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 538 free(save.pw_passwd); 539 free(save.pw_gecos); 540 free(save.pw_dir); 541 free(save.pw_shell); 542 } 543 save = *p; 544 save.pw_name = sgetsave(p->pw_name); 545 save.pw_passwd = sgetsave(p->pw_passwd); 546 save.pw_gecos = sgetsave(p->pw_gecos); 547 save.pw_dir = sgetsave(p->pw_dir); 548 save.pw_shell = sgetsave(p->pw_shell); 549 return (&save); 550} 551 552static int login_attempts; /* number of failed login attempts */ 553static int askpasswd; /* had user command, ask for passwd */ 554static char curname[16]; /* current USER name */ 555 556/* 557 * USER command. 558 * Sets global passwd pointer pw if named account exists and is acceptable; 559 * sets askpasswd if a PASS command is expected. If logged in previously, 560 * need to reset state. If name is "ftp" or "anonymous", the name is not in 561 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 562 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 563 * requesting login privileges. Disallow anyone who does not have a standard 564 * shell as returned by getusershell(). Disallow anyone mentioned in the file 565 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 566 */ 567void 568user(name) 569 char *name; 570{ 571 char *cp, *shell; 572 573 if (logged_in) { 574 if (guest) { 575 reply(530, "Can't change user from guest login."); 576 return; 577 } else if (dochroot) { 578 reply(530, "Can't change user from chroot user."); 579 return; 580 } 581 end_login(); 582 } 583 584 guest = 0; 585 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 586 if (checkuser(_PATH_FTPUSERS, "ftp") || 587 checkuser(_PATH_FTPUSERS, "anonymous")) 588 reply(530, "User %s access denied.", name); 589 else if ((pw = sgetpwnam("ftp")) != NULL) { 590 guest = 1; 591 askpasswd = 1; 592 reply(331, 593 "Guest login ok, type your name as password."); 594 } else 595 reply(530, "User %s unknown.", name); 596 if (!askpasswd && logging) 597 syslog(LOG_NOTICE, 598 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 599 return; 600 } 601 if (anon_only != 0) { 602 reply(530, "Sorry, only anonymous ftp allowed."); 603 return; 604 } 605 606 if (pw = sgetpwnam(name)) { 607 if ((shell = pw->pw_shell) == NULL || *shell == 0) 608 shell = _PATH_BSHELL; 609 while ((cp = getusershell()) != NULL) 610 if (strcmp(cp, shell) == 0) 611 break; 612 endusershell(); 613 614 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 615 reply(530, "User %s access denied.", name); 616 if (logging) 617 syslog(LOG_NOTICE, 618 "FTP LOGIN REFUSED FROM %s, %s", 619 remotehost, name); 620 pw = (struct passwd *) NULL; 621 return; 622 } 623 } 624 if (logging) { 625 strncpy(curname, name, sizeof(curname)-1); 626 curname[sizeof(curname)-1] = '\0'; 627 } 628#ifdef SKEY 629 if (!skey_haskey(name)) { 630 char *myskey, *skey_keyinfo __P((char *name)); 631 632 myskey = skey_keyinfo(name); 633 reply(331, "Password [ %s ] for %s required.", 634 myskey ? myskey : "error getting challenge", name); 635 } else 636#endif 637 reply(331, "Password required for %s.", name); 638 639 askpasswd = 1; 640 /* 641 * Delay before reading passwd after first failed 642 * attempt to slow down passwd-guessing programs. 643 */ 644 if (login_attempts) 645 sleep((unsigned) login_attempts); 646} 647 648/* 649 * Check if a user is in the file "fname" 650 */ 651static int 652checkuser(fname, name) 653 char *fname; 654 char *name; 655{ 656 FILE *fd; 657 int found = 0; 658 char *p, line[BUFSIZ]; 659 660 if ((fd = fopen(fname, "r")) != NULL) { 661 while (fgets(line, sizeof(line), fd) != NULL) 662 if ((p = strchr(line, '\n')) != NULL) { 663 *p = '\0'; 664 if (line[0] == '#') 665 continue; 666 if (strcmp(line, name) == 0) { 667 found = 1; 668 break; 669 } 670 } 671 (void) fclose(fd); 672 } 673 return (found); 674} 675 676/* 677 * Terminate login as previous user, if any, resetting state; 678 * used when USER command is given or login fails. 679 */ 680static void 681end_login() 682{ 683 sigset_t allsigs; 684 sigfillset (&allsigs); 685 sigprocmask (SIG_BLOCK, &allsigs, NULL); 686 (void) seteuid((uid_t)0); 687 if (logged_in) { 688 logwtmp(ttyline, "", ""); 689 if (doutmp) 690 logout(utmp.ut_line); 691 } 692 pw = NULL; 693 logged_in = 0; 694 guest = 0; 695 dochroot = 0; 696} 697 698void 699pass(passwd) 700 char *passwd; 701{ 702 int rval; 703 FILE *fd; 704 static char homedir[MAXPATHLEN]; 705 char rootdir[MAXPATHLEN]; 706 sigset_t allsigs; 707 708 if (logged_in || askpasswd == 0) { 709 reply(503, "Login with USER first."); 710 return; 711 } 712 askpasswd = 0; 713 if (!guest) { /* "ftp" is only account allowed no password */ 714 if (pw == NULL) { 715 rval = 1; /* failure below */ 716 goto skip; 717 } 718#if defined(KERBEROS) 719 rval = klogin(pw, "", hostname, passwd); 720 if (rval == 0) 721 goto skip; 722#endif 723#ifdef SKEY 724 if (skey_haskey(pw->pw_name) == 0 && 725 (skey_passcheck(pw->pw_name, passwd) != -1)) { 726 rval = 0; 727 goto skip; 728 } 729#endif 730 /* the strcmp does not catch null passwords! */ 731 if (pw == NULL || *pw->pw_passwd == '\0' || 732 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 733 rval = 1; /* failure */ 734 goto skip; 735 } 736 rval = 0; 737 738skip: 739 /* 740 * If rval == 1, the user failed the authentication check 741 * above. If rval == 0, either Kerberos or local authentication 742 * succeeded. 743 */ 744 if (rval) { 745 reply(530, "Login incorrect."); 746 if (logging) 747 syslog(LOG_NOTICE, 748 "FTP LOGIN FAILED FROM %s, %s", 749 remotehost, curname); 750 pw = NULL; 751 if (login_attempts++ >= 5) { 752 syslog(LOG_NOTICE, 753 "repeated login failures from %s", 754 remotehost); 755 exit(0); 756 } 757 return; 758 } 759 } else { 760 /* Save anonymous' password. */ 761 guestpw = strdup(passwd); 762 if (guestpw == (char *)NULL) 763 fatal("Out of memory"); 764 } 765 login_attempts = 0; /* this time successful */ 766 if (setegid((gid_t)pw->pw_gid) < 0) { 767 reply(550, "Can't set gid."); 768 return; 769 } 770 (void) initgroups(pw->pw_name, pw->pw_gid); 771 772 /* open wtmp before chroot */ 773 logwtmp(ttyline, pw->pw_name, remotehost); 774 775 /* open utmp before chroot */ 776 if (doutmp) { 777 memset((void *)&utmp, 0, sizeof(utmp)); 778 (void)time(&utmp.ut_time); 779 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 780 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 781 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 782 login(&utmp); 783 } 784 785 /* open stats file before chroot */ 786 if (guest && (stats == 1) && (statfd < 0)) 787 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 788 stats = 0; 789 790 logged_in = 1; 791 792 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 793 if (guest || dochroot) { 794 if (multihome) { 795 struct stat ts; 796 797 /* Compute root directory. */ 798 snprintf (rootdir, sizeof(rootdir), "%s/%s", 799 pw->pw_dir, dhostname); 800 if (stat(rootdir, &ts) < 0) { 801 snprintf (rootdir, sizeof(rootdir), "%s/%s", 802 pw->pw_dir, hostname); 803 } 804 } else 805 strcpy (rootdir, pw->pw_dir); 806 } 807 if (guest) { 808 /* 809 * We MUST do a chdir() after the chroot. Otherwise 810 * the old current directory will be accessible as "." 811 * outside the new root! 812 */ 813 if (chroot(rootdir) < 0 || chdir("/") < 0) { 814 reply(550, "Can't set guest privileges."); 815 goto bad; 816 } 817 strcpy(pw->pw_dir, "/"); 818 setenv("HOME", "/", 1); 819 } else if (dochroot) { 820 if (chroot(rootdir) < 0 || chdir("/") < 0) { 821 reply(550, "Can't change root."); 822 goto bad; 823 } 824 strcpy(pw->pw_dir, "/"); 825 setenv("HOME", "/", 1); 826 } else if (chdir(pw->pw_dir) < 0) { 827 if (chdir("/") < 0) { 828 reply(530, "User %s: can't change directory to %s.", 829 pw->pw_name, pw->pw_dir); 830 goto bad; 831 } else 832 lreply(230, "No directory! Logging in with home=/"); 833 } 834 if (seteuid((uid_t)pw->pw_uid) < 0) { 835 reply(550, "Can't set uid."); 836 goto bad; 837 } 838 sigfillset(&allsigs); 839 sigprocmask(SIG_UNBLOCK,&allsigs,NULL); 840 841 /* 842 * Set home directory so that use of ~ (tilde) works correctly. 843 */ 844 if (getcwd(homedir, MAXPATHLEN) != NULL) 845 setenv("HOME", homedir, 1); 846 847 /* 848 * Display a login message, if it exists. 849 * N.B. reply(230,) must follow the message. 850 */ 851 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 852 char *cp, line[LINE_MAX]; 853 854 while (fgets(line, sizeof(line), fd) != NULL) { 855 if ((cp = strchr(line, '\n')) != NULL) 856 *cp = '\0'; 857 lreply(230, "%s", line); 858 } 859 (void) fflush(stdout); 860 (void) fclose(fd); 861 } 862 if (guest) { 863 if (ident != NULL) 864 free(ident); 865 ident = strdup(passwd); 866 if (ident == (char *)NULL) 867 fatal("Ran out of memory."); 868 reply(230, "Guest login ok, access restrictions apply."); 869#ifdef HASSETPROCTITLE 870 snprintf(proctitle, sizeof(proctitle), 871 "%s: anonymous/%.*s", remotehost, 872 sizeof(proctitle) - sizeof(remotehost) - 873 sizeof(": anonymous/"), passwd); 874 setproctitle(proctitle); 875#endif /* HASSETPROCTITLE */ 876 if (logging) 877 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 878 remotehost, passwd); 879 } else { 880 reply(230, "User %s logged in.", pw->pw_name); 881#ifdef HASSETPROCTITLE 882 snprintf(proctitle, sizeof(proctitle), 883 "%s: %s", remotehost, pw->pw_name); 884 setproctitle(proctitle); 885#endif /* HASSETPROCTITLE */ 886 if (logging) 887 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 888 remotehost, pw->pw_name); 889 } 890 (void) umask(defumask); 891 return; 892bad: 893 /* Forget all about it... */ 894 end_login(); 895} 896 897void 898retrieve(cmd, name) 899 char *cmd, *name; 900{ 901 FILE *fin, *dout; 902 struct stat st; 903 int (*closefunc) __P((FILE *)); 904 time_t start; 905 906 if (cmd == 0) { 907 fin = fopen(name, "r"), closefunc = fclose; 908 st.st_size = 0; 909 } else { 910 char line[BUFSIZ]; 911 912 (void) snprintf(line, sizeof(line), cmd, name); 913 name = line; 914 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 915 st.st_size = -1; 916 st.st_blksize = BUFSIZ; 917 } 918 if (fin == NULL) { 919 if (errno != 0) { 920 perror_reply(550, name); 921 if (cmd == 0) { 922 LOGCMD("get", name); 923 } 924 } 925 return; 926 } 927 byte_count = -1; 928 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 929 reply(550, "%s: not a plain file.", name); 930 goto done; 931 } 932 if (restart_point) { 933 if (type == TYPE_A) { 934 off_t i, n; 935 int c; 936 937 n = restart_point; 938 i = 0; 939 while (i++ < n) { 940 if ((c=getc(fin)) == EOF) { 941 perror_reply(550, name); 942 goto done; 943 } 944 if (c == '\n') 945 i++; 946 } 947 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 948 perror_reply(550, name); 949 goto done; 950 } 951 } 952 dout = dataconn(name, st.st_size, "w"); 953 if (dout == NULL) 954 goto done; 955 time(&start); 956 send_data(fin, dout, st.st_blksize, st.st_size, 957 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 958 if ((cmd == 0) && stats) 959 logxfer(name, st.st_size, start); 960 (void) fclose(dout); 961 data = -1; 962 pdata = -1; 963done: 964 if (cmd == 0) 965 LOGBYTES("get", name, byte_count); 966 (*closefunc)(fin); 967} 968 969void 970store(name, mode, unique) 971 char *name, *mode; 972 int unique; 973{ 974 FILE *fout, *din; 975 int (*closefunc) __P((FILE *)); 976 struct stat st; 977 int fd; 978 979 if (unique && stat(name, &st) == 0) { 980 char *nam; 981 982 fd = guniquefd(name, &nam); 983 if (fd == -1) { 984 LOGCMD(*mode == 'w' ? "put" : "append", name); 985 return; 986 } 987 name = nam; 988 if (restart_point) 989 mode = "r+"; 990 fout = fdopen(fd, mode); 991 } else 992 fout = fopen(name, mode); 993 994 closefunc = fclose; 995 if (fout == NULL) { 996 perror_reply(553, name); 997 LOGCMD(*mode == 'w' ? "put" : "append", name); 998 return; 999 } 1000 byte_count = -1; 1001 if (restart_point) { 1002 if (type == TYPE_A) { 1003 off_t i, n; 1004 int c; 1005 1006 n = restart_point; 1007 i = 0; 1008 while (i++ < n) { 1009 if ((c=getc(fout)) == EOF) { 1010 perror_reply(550, name); 1011 goto done; 1012 } 1013 if (c == '\n') 1014 i++; 1015 } 1016 /* 1017 * We must do this seek to "current" position 1018 * because we are changing from reading to 1019 * writing. 1020 */ 1021 if (fseek(fout, 0L, L_INCR) < 0) { 1022 perror_reply(550, name); 1023 goto done; 1024 } 1025 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1026 perror_reply(550, name); 1027 goto done; 1028 } 1029 } 1030 din = dataconn(name, (off_t)-1, "r"); 1031 if (din == NULL) 1032 goto done; 1033 if (receive_data(din, fout) == 0) { 1034 if (unique) 1035 reply(226, "Transfer complete (unique file name:%s).", 1036 name); 1037 else 1038 reply(226, "Transfer complete."); 1039 } 1040 (void) fclose(din); 1041 data = -1; 1042 pdata = -1; 1043done: 1044 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1045 (*closefunc)(fout); 1046} 1047 1048static FILE * 1049getdatasock(mode) 1050 char *mode; 1051{ 1052 int on = 1, s, t, tries; 1053 sigset_t allsigs; 1054 1055 if (data >= 0) 1056 return (fdopen(data, mode)); 1057 sigfillset(&allsigs); 1058 sigprocmask (SIG_BLOCK, &allsigs, NULL); 1059 (void) seteuid((uid_t)0); 1060 s = socket(AF_INET, SOCK_STREAM, 0); 1061 if (s < 0) 1062 goto bad; 1063 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1064 (char *) &on, sizeof(on)) < 0) 1065 goto bad; 1066 /* anchor socket to avoid multi-homing problems */ 1067 data_source.sin_len = sizeof(struct sockaddr_in); 1068 data_source.sin_family = AF_INET; 1069 data_source.sin_addr = ctrl_addr.sin_addr; 1070 for (tries = 1; ; tries++) { 1071 if (bind(s, (struct sockaddr *)&data_source, 1072 sizeof(data_source)) >= 0) 1073 break; 1074 if (errno != EADDRINUSE || tries > 10) 1075 goto bad; 1076 sleep(tries); 1077 } 1078 (void) seteuid((uid_t)pw->pw_uid); 1079 sigfillset(&allsigs); 1080 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1081 1082#ifdef IP_TOS 1083 on = IPTOS_THROUGHPUT; 1084 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1085 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1086#endif 1087#ifdef TCP_NOPUSH 1088 /* 1089 * Turn off push flag to keep sender TCP from sending short packets 1090 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1091 * to set the send buffer size as well, but that may not be desirable 1092 * in heavy-load situations. 1093 */ 1094 on = 1; 1095 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1096 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1097#endif 1098#ifdef SO_SNDBUF 1099 on = 65536; 1100 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1101 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1102#endif 1103 1104 return (fdopen(s, mode)); 1105bad: 1106 /* Return the real value of errno (close may change it) */ 1107 t = errno; 1108 (void) seteuid((uid_t)pw->pw_uid); 1109 sigfillset (&allsigs); 1110 sigprocmask (SIG_UNBLOCK, &allsigs, NULL); 1111 (void) close(s); 1112 errno = t; 1113 return (NULL); 1114} 1115 1116static FILE * 1117dataconn(name, size, mode) 1118 char *name; 1119 off_t size; 1120 char *mode; 1121{ 1122 char sizebuf[32]; 1123 FILE *file; 1124 int retry = 0, tos; 1125 1126 file_size = size; 1127 byte_count = 0; 1128 if (size != (off_t) -1) { 1129 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1130 size); 1131 } else 1132 sizebuf[0] = '\0'; 1133 if (pdata >= 0) { 1134 struct sockaddr_in from; 1135 int s, fromlen = sizeof(from); 1136 1137 signal (SIGALRM, toolong); 1138 (void) alarm ((unsigned) timeout); 1139 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1140 (void) alarm (0); 1141 if (s < 0) { 1142 reply(425, "Can't open data connection."); 1143 (void) close(pdata); 1144 pdata = -1; 1145 return (NULL); 1146 } 1147 if (ntohs(from.sin_port) < IPPORT_RESERVED) { 1148 perror_reply(425, "Can't build data connection"); 1149 (void) close(pdata); 1150 (void) close(s); 1151 pdata = -1; 1152 return (NULL); 1153 } 1154 if (from.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1155 perror_reply(435, "Can't build data connection"); 1156 (void) close(pdata); 1157 (void) close(s); 1158 pdata = -1; 1159 return (NULL); 1160 } 1161 (void) close(pdata); 1162 pdata = s; 1163#ifdef IP_TOS 1164 tos = IPTOS_THROUGHPUT; 1165 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1166 sizeof(int)); 1167#endif 1168 reply(150, "Opening %s mode data connection for '%s'%s.", 1169 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1170 return (fdopen(pdata, mode)); 1171 } 1172 if (data >= 0) { 1173 reply(125, "Using existing data connection for '%s'%s.", 1174 name, sizebuf); 1175 usedefault = 1; 1176 return (fdopen(data, mode)); 1177 } 1178 if (usedefault) 1179 data_dest = his_addr; 1180 usedefault = 1; 1181 file = getdatasock(mode); 1182 if (file == NULL) { 1183 reply(425, "Can't create data socket (%s,%d): %s.", 1184 inet_ntoa(data_source.sin_addr), 1185 ntohs(data_source.sin_port), strerror(errno)); 1186 return (NULL); 1187 } 1188 data = fileno(file); 1189 1190 /* 1191 * attempt to connect to reserved port on client machine; 1192 * this looks like an attack 1193 */ 1194 if (ntohs(data_dest.sin_port) < IPPORT_RESERVED) { 1195 perror_reply(425, "Can't build data connection"); 1196 (void) fclose(file); 1197 data = -1; 1198 return NULL; 1199 } 1200 if (data_dest.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1201 perror_reply(435, "Can't build data connection"); 1202 (void) fclose(file); 1203 data = -1; 1204 return NULL; 1205 } 1206 while (connect(data, (struct sockaddr *)&data_dest, 1207 sizeof(data_dest)) < 0) { 1208 if (errno == EADDRINUSE && retry < swaitmax) { 1209 sleep((unsigned) swaitint); 1210 retry += swaitint; 1211 continue; 1212 } 1213 perror_reply(425, "Can't build data connection"); 1214 (void) fclose(file); 1215 data = -1; 1216 return (NULL); 1217 } 1218 reply(150, "Opening %s mode data connection for '%s'%s.", 1219 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1220 return (file); 1221} 1222 1223/* 1224 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1225 * encapsulation of the data subject to Mode, Structure, and Type. 1226 * 1227 * NB: Form isn't handled. 1228 */ 1229static void 1230send_data(instr, outstr, blksize, filesize, isreg) 1231 FILE *instr, *outstr; 1232 off_t blksize; 1233 off_t filesize; 1234 int isreg; 1235{ 1236 int c, cnt, filefd, netfd; 1237 char *buf, *bp; 1238 size_t len; 1239 1240 transflag++; 1241 if (setjmp(urgcatch)) { 1242 transflag = 0; 1243 return; 1244 } 1245 switch (type) { 1246 1247 case TYPE_A: 1248 while ((c = getc(instr)) != EOF) { 1249 byte_count++; 1250 if (c == '\n') { 1251 if (ferror(outstr)) 1252 goto data_err; 1253 (void) putc('\r', outstr); 1254 } 1255 (void) putc(c, outstr); 1256 } 1257 fflush(outstr); 1258 transflag = 0; 1259 if (ferror(instr)) 1260 goto file_err; 1261 if (ferror(outstr)) 1262 goto data_err; 1263 reply(226, "Transfer complete."); 1264 return; 1265 1266 case TYPE_I: 1267 case TYPE_L: 1268 /* 1269 * isreg is only set if we are not doing restart and we 1270 * are sending a regular file 1271 */ 1272 netfd = fileno(outstr); 1273 filefd = fileno(instr); 1274 1275 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1276 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1277 (off_t)0); 1278 if (!buf) { 1279 syslog(LOG_WARNING, "mmap(%lu): %m", 1280 (unsigned long)filesize); 1281 goto oldway; 1282 } 1283 bp = buf; 1284 len = filesize; 1285 do { 1286 cnt = write(netfd, bp, len); 1287 len -= cnt; 1288 bp += cnt; 1289 if (cnt > 0) byte_count += cnt; 1290 } while(cnt > 0 && len > 0); 1291 1292 transflag = 0; 1293 munmap(buf, (size_t)filesize); 1294 if (cnt < 0) 1295 goto data_err; 1296 reply(226, "Transfer complete."); 1297 return; 1298 } 1299 1300oldway: 1301 if ((buf = malloc((u_int)blksize)) == NULL) { 1302 transflag = 0; 1303 perror_reply(451, "Local resource failure: malloc"); 1304 return; 1305 } 1306 1307 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1308 write(netfd, buf, cnt) == cnt) 1309 byte_count += cnt; 1310 transflag = 0; 1311 (void)free(buf); 1312 if (cnt != 0) { 1313 if (cnt < 0) 1314 goto file_err; 1315 goto data_err; 1316 } 1317 reply(226, "Transfer complete."); 1318 return; 1319 default: 1320 transflag = 0; 1321 reply(550, "Unimplemented TYPE %d in send_data", type); 1322 return; 1323 } 1324 1325data_err: 1326 transflag = 0; 1327 perror_reply(426, "Data connection"); 1328 return; 1329 1330file_err: 1331 transflag = 0; 1332 perror_reply(551, "Error on input file"); 1333} 1334 1335/* 1336 * Transfer data from peer to "outstr" using the appropriate encapulation of 1337 * the data subject to Mode, Structure, and Type. 1338 * 1339 * N.B.: Form isn't handled. 1340 */ 1341static int 1342receive_data(instr, outstr) 1343 FILE *instr, *outstr; 1344{ 1345 int c; 1346 int cnt, bare_lfs = 0; 1347 char buf[BUFSIZ]; 1348 1349 transflag++; 1350 if (setjmp(urgcatch)) { 1351 transflag = 0; 1352 return (-1); 1353 } 1354 switch (type) { 1355 1356 case TYPE_I: 1357 case TYPE_L: 1358 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1359 if (write(fileno(outstr), buf, cnt) != cnt) 1360 goto file_err; 1361 byte_count += cnt; 1362 } 1363 if (cnt < 0) 1364 goto data_err; 1365 transflag = 0; 1366 return (0); 1367 1368 case TYPE_E: 1369 reply(553, "TYPE E not implemented."); 1370 transflag = 0; 1371 return (-1); 1372 1373 case TYPE_A: 1374 while ((c = getc(instr)) != EOF) { 1375 byte_count++; 1376 if (c == '\n') 1377 bare_lfs++; 1378 while (c == '\r') { 1379 if (ferror(outstr)) 1380 goto data_err; 1381 if ((c = getc(instr)) != '\n') { 1382 (void) putc ('\r', outstr); 1383 if (c == '\0' || c == EOF) 1384 goto contin2; 1385 } 1386 } 1387 (void) putc(c, outstr); 1388 contin2: ; 1389 } 1390 fflush(outstr); 1391 if (ferror(instr)) 1392 goto data_err; 1393 if (ferror(outstr)) 1394 goto file_err; 1395 transflag = 0; 1396 if (bare_lfs) { 1397 lreply(226, 1398 "WARNING! %d bare linefeeds received in ASCII mode", 1399 bare_lfs); 1400 (void)printf(" File may not have transferred correctly.\r\n"); 1401 } 1402 return (0); 1403 default: 1404 reply(550, "Unimplemented TYPE %d in receive_data", type); 1405 transflag = 0; 1406 return (-1); 1407 } 1408 1409data_err: 1410 transflag = 0; 1411 perror_reply(426, "Data Connection"); 1412 return (-1); 1413 1414file_err: 1415 transflag = 0; 1416 perror_reply(452, "Error writing file"); 1417 return (-1); 1418} 1419 1420void 1421statfilecmd(filename) 1422 char *filename; 1423{ 1424 FILE *fin; 1425 int c; 1426 char line[LINE_MAX]; 1427 1428 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1429 fin = ftpd_popen(line, "r"); 1430 lreply(211, "status of %s:", filename); 1431 while ((c = getc(fin)) != EOF) { 1432 if (c == '\n') { 1433 if (ferror(stdout)){ 1434 perror_reply(421, "control connection"); 1435 (void) ftpd_pclose(fin); 1436 dologout(1); 1437 /* NOTREACHED */ 1438 } 1439 if (ferror(fin)) { 1440 perror_reply(551, filename); 1441 (void) ftpd_pclose(fin); 1442 return; 1443 } 1444 (void) putc('\r', stdout); 1445 } 1446 (void) putc(c, stdout); 1447 } 1448 (void) ftpd_pclose(fin); 1449 reply(211, "End of Status"); 1450} 1451 1452void 1453statcmd() 1454{ 1455 struct sockaddr_in *sin; 1456 u_char *a, *p; 1457 1458 lreply(211, "%s FTP server status:", hostname, version); 1459 printf(" %s\r\n", version); 1460 printf(" Connected to %s", remotehost); 1461 if (!isdigit(remotehost[0])) 1462 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1463 printf("\r\n"); 1464 if (logged_in) { 1465 if (guest) 1466 printf(" Logged in anonymously\r\n"); 1467 else 1468 printf(" Logged in as %s\r\n", pw->pw_name); 1469 } else if (askpasswd) 1470 printf(" Waiting for password\r\n"); 1471 else 1472 printf(" Waiting for user name\r\n"); 1473 printf(" TYPE: %s", typenames[type]); 1474 if (type == TYPE_A || type == TYPE_E) 1475 printf(", FORM: %s", formnames[form]); 1476 if (type == TYPE_L) 1477#if NBBY == 8 1478 printf(" %d", NBBY); 1479#else 1480 printf(" %d", bytesize); /* need definition! */ 1481#endif 1482 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1483 strunames[stru], modenames[mode]); 1484 if (data != -1) 1485 printf(" Data connection open\r\n"); 1486 else if (pdata != -1) { 1487 printf(" in Passive mode"); 1488 sin = &pasv_addr; 1489 goto printaddr; 1490 } else if (usedefault == 0) { 1491 printf(" PORT"); 1492 sin = &data_dest; 1493printaddr: 1494 a = (u_char *) &sin->sin_addr; 1495 p = (u_char *) &sin->sin_port; 1496#define UC(b) (((int) b) & 0xff) 1497 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1498 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1499#undef UC 1500 } else 1501 printf(" No data connection\r\n"); 1502 reply(211, "End of status"); 1503} 1504 1505void 1506fatal(s) 1507 char *s; 1508{ 1509 1510 reply(451, "Error in server: %s\n", s); 1511 reply(221, "Closing connection due to server error."); 1512 dologout(0); 1513 /* NOTREACHED */ 1514} 1515 1516void 1517#if __STDC__ 1518reply(int n, const char *fmt, ...) 1519#else 1520reply(n, fmt, va_alist) 1521 int n; 1522 char *fmt; 1523 va_dcl 1524#endif 1525{ 1526 va_list ap; 1527#if __STDC__ 1528 va_start(ap, fmt); 1529#else 1530 va_start(ap); 1531#endif 1532 (void)printf("%d ", n); 1533 (void)vprintf(fmt, ap); 1534 (void)printf("\r\n"); 1535 (void)fflush(stdout); 1536 if (debug) { 1537 syslog(LOG_DEBUG, "<--- %d ", n); 1538 vsyslog(LOG_DEBUG, fmt, ap); 1539 } 1540} 1541 1542void 1543#if __STDC__ 1544lreply(int n, const char *fmt, ...) 1545#else 1546lreply(n, fmt, va_alist) 1547 int n; 1548 char *fmt; 1549 va_dcl 1550#endif 1551{ 1552 va_list ap; 1553#if __STDC__ 1554 va_start(ap, fmt); 1555#else 1556 va_start(ap); 1557#endif 1558 (void)printf("%d- ", n); 1559 (void)vprintf(fmt, ap); 1560 (void)printf("\r\n"); 1561 (void)fflush(stdout); 1562 if (debug) { 1563 syslog(LOG_DEBUG, "<--- %d- ", n); 1564 vsyslog(LOG_DEBUG, fmt, ap); 1565 } 1566} 1567 1568static void 1569ack(s) 1570 char *s; 1571{ 1572 1573 reply(250, "%s command successful.", s); 1574} 1575 1576void 1577nack(s) 1578 char *s; 1579{ 1580 1581 reply(502, "%s command not implemented.", s); 1582} 1583 1584/* ARGSUSED */ 1585void 1586yyerror(s) 1587 char *s; 1588{ 1589 char *cp; 1590 1591 if (cp = strchr(cbuf,'\n')) 1592 *cp = '\0'; 1593 reply(500, "'%s': command not understood.", cbuf); 1594} 1595 1596void 1597delete(name) 1598 char *name; 1599{ 1600 struct stat st; 1601 1602 LOGCMD("delete", name); 1603 if (stat(name, &st) < 0) { 1604 perror_reply(550, name); 1605 return; 1606 } 1607 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1608 if (rmdir(name) < 0) { 1609 perror_reply(550, name); 1610 return; 1611 } 1612 goto done; 1613 } 1614 if (unlink(name) < 0) { 1615 perror_reply(550, name); 1616 return; 1617 } 1618done: 1619 ack("DELE"); 1620} 1621 1622void 1623cwd(path) 1624 char *path; 1625{ 1626 1627 if (chdir(path) < 0) 1628 perror_reply(550, path); 1629 else 1630 ack("CWD"); 1631} 1632 1633void 1634makedir(name) 1635 char *name; 1636{ 1637 1638 LOGCMD("mkdir", name); 1639 if (mkdir(name, 0777) < 0) 1640 perror_reply(550, name); 1641 else 1642 reply(257, "MKD command successful."); 1643} 1644 1645void 1646removedir(name) 1647 char *name; 1648{ 1649 1650 LOGCMD("rmdir", name); 1651 if (rmdir(name) < 0) 1652 perror_reply(550, name); 1653 else 1654 ack("RMD"); 1655} 1656 1657void 1658pwd() 1659{ 1660 char path[MAXPATHLEN + 1]; 1661 1662 if (getwd(path) == (char *)NULL) 1663 reply(550, "%s.", path); 1664 else 1665 reply(257, "\"%s\" is current directory.", path); 1666} 1667 1668char * 1669renamefrom(name) 1670 char *name; 1671{ 1672 struct stat st; 1673 1674 if (stat(name, &st) < 0) { 1675 perror_reply(550, name); 1676 return ((char *)0); 1677 } 1678 reply(350, "File exists, ready for destination name"); 1679 return (name); 1680} 1681 1682void 1683renamecmd(from, to) 1684 char *from, *to; 1685{ 1686 1687 LOGCMD2("rename", from, to); 1688 if (rename(from, to) < 0) 1689 perror_reply(550, "rename"); 1690 else 1691 ack("RNTO"); 1692} 1693 1694static void 1695dolog(sin) 1696 struct sockaddr_in *sin; 1697{ 1698 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1699 sizeof(struct in_addr), AF_INET); 1700 1701 if (hp) 1702 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)-1); 1703 else 1704 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1705 sizeof(remotehost)-1); 1706 remotehost[sizeof(remotehost)-1] = '\0'; 1707#ifdef HASSETPROCTITLE 1708 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1709 setproctitle(proctitle); 1710#endif /* HASSETPROCTITLE */ 1711 1712 if (logging) 1713 syslog(LOG_INFO, "connection from %s", remotehost); 1714} 1715 1716/* 1717 * Record logout in wtmp file 1718 * and exit with supplied status. 1719 */ 1720void 1721dologout(status) 1722 int status; 1723{ 1724 sigset_t allsigs; 1725 1726 transflag = 0; 1727 1728 if (logged_in) { 1729 sigfillset(&allsigs); 1730 sigprocmask(SIG_BLOCK, &allsigs, NULL); 1731 (void) seteuid((uid_t)0); 1732 logwtmp(ttyline, "", ""); 1733 if (doutmp) 1734 logout(utmp.ut_line); 1735#if defined(KERBEROS) 1736 if (!notickets && krbtkfile_env) 1737 unlink(krbtkfile_env); 1738#endif 1739 } 1740 /* beware of flushing buffers after a SIGPIPE */ 1741 _exit(status); 1742} 1743 1744static void 1745myoob(signo) 1746 int signo; 1747{ 1748 char *cp; 1749 1750 /* only process if transfer occurring */ 1751 if (!transflag) 1752 return; 1753 cp = tmpline; 1754 if (getline(cp, 7, stdin) == NULL) { 1755 reply(221, "You could at least say goodbye."); 1756 dologout(0); 1757 } 1758 upper(cp); 1759 if (strcmp(cp, "ABOR\r\n") == 0) { 1760 tmpline[0] = '\0'; 1761 reply(426, "Transfer aborted. Data connection closed."); 1762 reply(226, "Abort successful"); 1763 longjmp(urgcatch, 1); 1764 } 1765 if (strcmp(cp, "STAT\r\n") == 0) { 1766 if (file_size != (off_t) -1) 1767 reply(213, "Status: %qd of %qd bytes transferred", 1768 byte_count, file_size); 1769 else 1770 reply(213, "Status: %qd bytes transferred", byte_count); 1771 } 1772} 1773 1774/* 1775 * Note: a response of 425 is not mentioned as a possible response to 1776 * the PASV command in RFC959. However, it has been blessed as 1777 * a legitimate response by Jon Postel in a telephone conversation 1778 * with Rick Adams on 25 Jan 89. 1779 */ 1780void 1781passive() 1782{ 1783 int len, on; 1784 u_short port; 1785 char *p, *a; 1786 1787 if (pw == NULL) { 1788 reply(530, "Please login with USER and PASS"); 1789 return; 1790 } 1791 if (pdata >= 0) 1792 close(pdata); 1793 pdata = socket(AF_INET, SOCK_STREAM, 0); 1794 if (pdata < 0) { 1795 perror_reply(425, "Can't open passive connection"); 1796 return; 1797 } 1798 1799#ifdef IP_PORTRANGE 1800 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 1801 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 1802 (char *)&on, sizeof(on)) < 0) 1803 goto pasv_error; 1804#endif 1805 1806 pasv_addr = ctrl_addr; 1807 pasv_addr.sin_port = 0; 1808 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1809 sizeof(pasv_addr)) < 0) 1810 goto pasv_error; 1811 1812 len = sizeof(pasv_addr); 1813 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1814 goto pasv_error; 1815 if (listen(pdata, 1) < 0) 1816 goto pasv_error; 1817 a = (char *) &pasv_addr.sin_addr; 1818 p = (char *) &pasv_addr.sin_port; 1819 1820#define UC(b) (((int) b) & 0xff) 1821 1822 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1823 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1824 return; 1825 1826pasv_error: 1827 (void) close(pdata); 1828 pdata = -1; 1829 perror_reply(425, "Can't open passive connection"); 1830 return; 1831} 1832 1833/* 1834 * Generate unique name for file with basename "local". 1835 * The file named "local" is already known to exist. 1836 * Generates failure reply on error. 1837 */ 1838static int 1839guniquefd(local, nam) 1840 char *local; 1841 char **nam; 1842{ 1843 static char new[MAXPATHLEN]; 1844 struct stat st; 1845 int count, len, fd; 1846 char *cp; 1847 1848 cp = strrchr(local, '/'); 1849 if (cp) 1850 *cp = '\0'; 1851 if (stat(cp ? local : ".", &st) < 0) { 1852 perror_reply(553, cp ? local : "."); 1853 return (-1); 1854 } 1855 if (cp) 1856 *cp = '/'; 1857 (void) strncpy(new, local, sizeof(new)-1); 1858 new[sizeof(new)-1] = '\0'; 1859 len = strlen(new); 1860 if (len+2+1 >= sizeof(new)-1) 1861 return (-1); 1862 cp = new + len; 1863 *cp++ = '.'; 1864 for (count = 1; count < 100; count++) { 1865 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 1866 fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666); 1867 if (fd == -1) 1868 continue; 1869 if (nam) 1870 *nam = new; 1871 return (fd); 1872 } 1873 reply(452, "Unique file name cannot be created."); 1874 return (-1); 1875} 1876 1877/* 1878 * Format and send reply containing system error number. 1879 */ 1880void 1881perror_reply(code, string) 1882 int code; 1883 char *string; 1884{ 1885 1886 reply(code, "%s: %s.", string, strerror(errno)); 1887} 1888 1889static char *onefile[] = { 1890 "", 1891 0 1892}; 1893 1894void 1895send_file_list(whichf) 1896 char *whichf; 1897{ 1898 struct stat st; 1899 DIR *dirp = NULL; 1900 struct dirent *dir; 1901 FILE *dout = NULL; 1902 char **dirlist, *dirname; 1903 int simple = 0; 1904 int freeglob = 0; 1905 glob_t gl; 1906 1907 if (strpbrk(whichf, "~{[*?") != NULL) { 1908 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1909 1910 memset(&gl, 0, sizeof(gl)); 1911 freeglob = 1; 1912 if (glob(whichf, flags, 0, &gl)) { 1913 reply(550, "not found"); 1914 goto out; 1915 } else if (gl.gl_pathc == 0) { 1916 errno = ENOENT; 1917 perror_reply(550, whichf); 1918 goto out; 1919 } 1920 dirlist = gl.gl_pathv; 1921 } else { 1922 onefile[0] = whichf; 1923 dirlist = onefile; 1924 simple = 1; 1925 } 1926 1927 if (setjmp(urgcatch)) { 1928 transflag = 0; 1929 goto out; 1930 } 1931 while (dirname = *dirlist++) { 1932 if (stat(dirname, &st) < 0) { 1933 /* 1934 * If user typed "ls -l", etc, and the client 1935 * used NLST, do what the user meant. 1936 */ 1937 if (dirname[0] == '-' && *dirlist == NULL && 1938 transflag == 0) { 1939 retrieve("/bin/ls %s", dirname); 1940 goto out; 1941 } 1942 perror_reply(550, whichf); 1943 if (dout != NULL) { 1944 (void) fclose(dout); 1945 transflag = 0; 1946 data = -1; 1947 pdata = -1; 1948 } 1949 goto out; 1950 } 1951 1952 if (S_ISREG(st.st_mode)) { 1953 if (dout == NULL) { 1954 dout = dataconn("file list", (off_t)-1, "w"); 1955 if (dout == NULL) 1956 goto out; 1957 transflag++; 1958 } 1959 fprintf(dout, "%s%s\n", dirname, 1960 type == TYPE_A ? "\r" : ""); 1961 byte_count += strlen(dirname) + 1; 1962 continue; 1963 } else if (!S_ISDIR(st.st_mode)) 1964 continue; 1965 1966 if ((dirp = opendir(dirname)) == NULL) 1967 continue; 1968 1969 while ((dir = readdir(dirp)) != NULL) { 1970 char nbuf[MAXPATHLEN]; 1971 1972 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1973 continue; 1974 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1975 dir->d_namlen == 2) 1976 continue; 1977 1978 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 1979 dir->d_name); 1980 1981 /* 1982 * We have to do a stat to insure it's 1983 * not a directory or special file. 1984 */ 1985 if (simple || (stat(nbuf, &st) == 0 && 1986 S_ISREG(st.st_mode))) { 1987 if (dout == NULL) { 1988 dout = dataconn("file list", (off_t)-1, 1989 "w"); 1990 if (dout == NULL) 1991 goto out; 1992 transflag++; 1993 } 1994 if (nbuf[0] == '.' && nbuf[1] == '/') 1995 fprintf(dout, "%s%s\n", &nbuf[2], 1996 type == TYPE_A ? "\r" : ""); 1997 else 1998 fprintf(dout, "%s%s\n", nbuf, 1999 type == TYPE_A ? "\r" : ""); 2000 byte_count += strlen(nbuf) + 1; 2001 } 2002 } 2003 (void) closedir(dirp); 2004 } 2005 2006 if (dout == NULL) 2007 reply(550, "No files found."); 2008 else if (ferror(dout) != 0) 2009 perror_reply(550, "Data connection"); 2010 else 2011 reply(226, "Transfer complete."); 2012 2013 transflag = 0; 2014 if (dout != NULL) 2015 (void) fclose(dout); 2016 data = -1; 2017 pdata = -1; 2018out: 2019 if (freeglob) { 2020 freeglob = 0; 2021 globfree(&gl); 2022 } 2023} 2024 2025static void 2026reapchild(signo) 2027 int signo; 2028{ 2029 while (wait3(NULL, WNOHANG, NULL) > 0); 2030} 2031 2032void 2033logxfer(name, size, start) 2034 char *name; 2035 off_t size; 2036 time_t start; 2037{ 2038 char buf[2048]; 2039 char path[MAXPATHLEN]; 2040 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 2041 char *vname, *vpw; 2042 time_t now; 2043 2044 if ((statfd >= 0) && (getcwd(path, sizeof(path)) != NULL)) { 2045 time(&now); 2046 2047 vname = (char *)malloc(strlen(name)*4+1); 2048 if (vname == NULL) 2049 return; 2050 vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); 2051 if (vpw == NULL) { 2052 free(vname); 2053 return; 2054 } 2055 2056 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2057 strvis(vpath, path, VIS_SAFE|VIS_NOSLASH); 2058 strvis(vname, name, VIS_SAFE|VIS_NOSLASH); 2059 strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2060 2061 snprintf(buf, sizeof(buf), 2062 "%.24s %d %s %qd %s/%s %c %s %c %c %s ftp %d %s %s\n", 2063 ctime(&now), now - start + (now == start), 2064 vremotehost, size, vpath, vname, 2065 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2066 'o', ((guest) ? 'a' : 'r'), 2067 vpw, 0 /* none yet */, 2068 ((guest) ? "*" : pw->pw_name), dhostname); 2069 write(statfd, buf, strlen(buf)); 2070 free(vname); 2071 free(vpw); 2072 } 2073} 2074