ftpd.c revision 1.6
1/* $OpenBSD: ftpd.c,v 1.6 1996/07/28 23:32:16 downsj 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 65#define FTP_NAMES 66#include <arpa/ftp.h> 67#include <arpa/inet.h> 68#include <arpa/telnet.h> 69 70#include <ctype.h> 71#include <dirent.h> 72#include <err.h> 73#include <errno.h> 74#include <fcntl.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#include <utmp.h> 88 89#include "pathnames.h" 90#include "extern.h" 91 92#if __STDC__ 93#include <stdarg.h> 94#else 95#include <varargs.h> 96#endif 97 98static char version[] = "Version 6.1/OpenBSD"; 99 100extern off_t restart_point; 101extern char cbuf[]; 102 103struct sockaddr_in server_addr; 104struct sockaddr_in ctrl_addr; 105struct sockaddr_in data_source; 106struct sockaddr_in data_dest; 107struct sockaddr_in his_addr; 108struct sockaddr_in pasv_addr; 109 110int daemon_mode = 0; 111int data; 112jmp_buf errcatch, urgcatch; 113int logged_in; 114struct passwd *pw; 115int debug = 0; 116int timeout = 900; /* timeout after 15 minutes of inactivity */ 117int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 118int logging; 119int guest; 120#ifdef STATS 121int stats; 122int statfd = -1; 123#endif 124int dochroot; 125int type; 126int form; 127int stru; /* avoid C keyword */ 128int mode; 129int doutmp = 0; /* update utmp file */ 130int usedefault = 1; /* for data transfers */ 131int pdata = -1; /* for passive mode */ 132sig_atomic_t transflag; 133off_t file_size; 134off_t byte_count; 135#if !defined(CMASK) || CMASK == 0 136#undef CMASK 137#define CMASK 027 138#endif 139int defumask = CMASK; /* default umask value */ 140char tmpline[7]; 141char hostname[MAXHOSTNAMELEN]; 142char remotehost[MAXHOSTNAMELEN]; 143static char ttyline[20]; 144char *tty = ttyline; /* for klogin */ 145static struct utmp utmp; /* for utmp */ 146 147#if defined(KERBEROS) 148int notickets = 1; 149char *krbtkfile_env = NULL; 150#endif 151 152#ifdef STATS 153char *ident = NULL; 154#endif 155 156 157/* 158 * Timeout intervals for retrying connections 159 * to hosts that don't accept PORT cmds. This 160 * is a kludge, but given the problems with TCP... 161 */ 162#define SWAITMAX 90 /* wait at most 90 seconds */ 163#define SWAITINT 5 /* interval between retries */ 164 165int swaitmax = SWAITMAX; 166int swaitint = SWAITINT; 167 168#ifdef HASSETPROCTITLE 169char proctitle[BUFSIZ]; /* initial part of title */ 170#endif /* HASSETPROCTITLE */ 171 172#define LOGCMD(cmd, file) \ 173 if (logging > 1) \ 174 syslog(LOG_INFO,"%s %s%s", cmd, \ 175 *(file) == '/' ? "" : curdir(), file); 176#define LOGCMD2(cmd, file1, file2) \ 177 if (logging > 1) \ 178 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 179 *(file1) == '/' ? "" : curdir(), file1, \ 180 *(file2) == '/' ? "" : curdir(), file2); 181#define LOGBYTES(cmd, file, cnt) \ 182 if (logging > 1) { \ 183 if (cnt == (off_t)-1) \ 184 syslog(LOG_INFO,"%s %s%s", cmd, \ 185 *(file) == '/' ? "" : curdir(), file); \ 186 else \ 187 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 188 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 189 } 190 191static void ack __P((char *)); 192static void myoob __P((int)); 193static int checkuser __P((char *, char *)); 194static FILE *dataconn __P((char *, off_t, char *)); 195static void dolog __P((struct sockaddr_in *)); 196static char *curdir __P((void)); 197static void end_login __P((void)); 198static FILE *getdatasock __P((char *)); 199static char *gunique __P((char *)); 200static void lostconn __P((int)); 201static int receive_data __P((FILE *, FILE *)); 202static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 203static struct passwd * 204 sgetpwnam __P((char *)); 205static char *sgetsave __P((char *)); 206static void reapchild __P((int)); 207 208#ifdef STATS 209void logxfer __P((char *, off_t, time_t)); 210#endif 211 212static char * 213curdir() 214{ 215 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 216 217 if (getcwd(path, sizeof(path)-2) == NULL) 218 return (""); 219 if (path[1] != '\0') /* special case for root dir. */ 220 strcat(path, "/"); 221 /* For guest account, skip / since it's chrooted */ 222 return (guest ? path+1 : path); 223} 224 225int 226main(argc, argv, envp) 227 int argc; 228 char *argv[]; 229 char **envp; 230{ 231 int addrlen, ch, on = 1, tos; 232 char *cp, line[LINE_MAX]; 233 FILE *fd; 234#ifdef STATS 235 char *argstr = "dDlSt:T:u:Uv"; 236#else 237 char *argstr = "dDlt:T:u:Uv"; 238#endif 239 240 tzset(); /* in case no timezone database in ~ftp */ 241 242 /* set this here so klogin can use it... */ 243 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 244 245 while ((ch = getopt(argc, argv, argstr)) != EOF) { 246 switch (ch) { 247 case 'd': 248 debug = 1; 249 break; 250 251 case 'D': 252 daemon_mode = 1; 253 break; 254 255 case 'l': 256 logging++; /* > 1 == extra logging */ 257 break; 258 259#ifdef STATS 260 case 'S': 261 stats = 1; 262 break; 263#endif 264 265 case 't': 266 timeout = atoi(optarg); 267 if (maxtimeout < timeout) 268 maxtimeout = timeout; 269 break; 270 271 case 'T': 272 maxtimeout = atoi(optarg); 273 if (timeout > maxtimeout) 274 timeout = maxtimeout; 275 break; 276 277 case 'u': 278 { 279 long val = 0; 280 281 val = strtol(optarg, &optarg, 8); 282 if (*optarg != '\0' || val < 0) 283 warnx("bad value for -u"); 284 else 285 defumask = val; 286 break; 287 } 288 289 case 'U': 290 doutmp = 1; 291 break; 292 293 case 'v': 294 debug = 1; 295 break; 296 297 default: 298 warnx("unknown flag -%c ignored", optopt); 299 break; 300 } 301 } 302 303 /* 304 * LOG_NDELAY sets up the logging connection immediately, 305 * necessary for anonymous ftp's that chroot and can't do it later. 306 */ 307 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 308 309 if (daemon_mode) { 310 int ctl_sock, fd; 311 struct servent *sv; 312 313 /* 314 * Detach from parent. 315 */ 316 if (daemon(1, 1) < 0) { 317 syslog(LOG_ERR, "failed to become a daemon"); 318 exit(1); 319 } 320 (void) signal(SIGCHLD, reapchild); 321 /* 322 * Get port number for ftp/tcp. 323 */ 324 sv = getservbyname("ftp", "tcp"); 325 if (sv == NULL) { 326 syslog(LOG_ERR, "getservbyname for ftp failed"); 327 exit(1); 328 } 329 /* 330 * Open a socket, bind it to the FTP port, and start 331 * listening. 332 */ 333 ctl_sock = socket(AF_INET, SOCK_STREAM, 0); 334 if (ctl_sock < 0) { 335 syslog(LOG_ERR, "control socket: %m"); 336 exit(1); 337 } 338 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 339 (char *)&on, sizeof(on)) < 0) 340 syslog(LOG_ERR, "control setsockopt: %m");; 341 server_addr.sin_family = AF_INET; 342 server_addr.sin_addr.s_addr = INADDR_ANY; 343 server_addr.sin_port = sv->s_port; 344 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 345 sizeof(server_addr))) { 346 syslog(LOG_ERR, "control bind: %m"); 347 exit(1); 348 } 349 if (listen(ctl_sock, 32) < 0) { 350 syslog(LOG_ERR, "control listen: %m"); 351 exit(1); 352 } 353 /* 354 * Loop forever accepting connection requests and forking off 355 * children to handle them. 356 */ 357 while (1) { 358 addrlen = sizeof(his_addr); 359 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 360 &addrlen); 361 if (fork() == 0) { 362 /* child */ 363 (void) dup2(fd, 0); 364 (void) dup2(fd, 1); 365 close(ctl_sock); 366 break; 367 } 368 close(fd); 369 } 370 } else { 371 addrlen = sizeof(his_addr); 372 if (getpeername(0, (struct sockaddr *)&his_addr, 373 &addrlen) < 0) { 374 syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); 375 exit(1); 376 } 377 } 378 379 (void) freopen(_PATH_DEVNULL, "w", stderr); 380 (void) signal(SIGPIPE, lostconn); 381 (void) signal(SIGCHLD, SIG_IGN); 382 if ((long)signal(SIGURG, myoob) < 0) 383 syslog(LOG_ERR, "signal: %m"); 384 385 addrlen = sizeof(ctrl_addr); 386 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 387 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 388 exit(1); 389 } 390#ifdef IP_TOS 391 tos = IPTOS_LOWDELAY; 392 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 393 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 394#endif 395 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 396 397 /* Try to handle urgent data inline */ 398#ifdef SO_OOBINLINE 399 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 400 syslog(LOG_ERR, "setsockopt: %m"); 401#endif 402 403#ifdef F_SETOWN 404 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 405 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 406#endif 407 dolog(&his_addr); 408 /* 409 * Set up default state 410 */ 411 data = -1; 412 type = TYPE_A; 413 form = FORM_N; 414 stru = STRU_F; 415 mode = MODE_S; 416 tmpline[0] = '\0'; 417 418 /* If logins are disabled, print out the message. */ 419 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 420 while (fgets(line, sizeof(line), fd) != NULL) { 421 if ((cp = strchr(line, '\n')) != NULL) 422 *cp = '\0'; 423 lreply(530, "%s", line); 424 } 425 (void) fflush(stdout); 426 (void) fclose(fd); 427 reply(530, "System not available."); 428 exit(0); 429 } 430 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 431 while (fgets(line, sizeof(line), fd) != NULL) { 432 if ((cp = strchr(line, '\n')) != NULL) 433 *cp = '\0'; 434 lreply(220, "%s", line); 435 } 436 (void) fflush(stdout); 437 (void) fclose(fd); 438 /* reply(220,) must follow */ 439 } 440 (void) gethostname(hostname, sizeof(hostname)); 441 reply(220, "%s FTP server (%s) ready.", hostname, version); 442 (void) setjmp(errcatch); 443 for (;;) 444 (void) yyparse(); 445 /* NOTREACHED */ 446} 447 448static void 449lostconn(signo) 450 int signo; 451{ 452 453 if (debug) 454 syslog(LOG_DEBUG, "lost connection"); 455 dologout(-1); 456} 457 458/* 459 * Helper function for sgetpwnam(). 460 */ 461static char * 462sgetsave(s) 463 char *s; 464{ 465 char *new = malloc((unsigned) strlen(s) + 1); 466 467 if (new == NULL) { 468 perror_reply(421, "Local resource failure: malloc"); 469 dologout(1); 470 /* NOTREACHED */ 471 } 472 (void) strcpy(new, s); 473 return (new); 474} 475 476/* 477 * Save the result of a getpwnam. Used for USER command, since 478 * the data returned must not be clobbered by any other command 479 * (e.g., globbing). 480 */ 481static struct passwd * 482sgetpwnam(name) 483 char *name; 484{ 485 static struct passwd save; 486 struct passwd *p; 487 488 if ((p = getpwnam(name)) == NULL) 489 return (p); 490 if (save.pw_name) { 491 free(save.pw_name); 492 free(save.pw_passwd); 493 free(save.pw_gecos); 494 free(save.pw_dir); 495 free(save.pw_shell); 496 } 497 save = *p; 498 save.pw_name = sgetsave(p->pw_name); 499 save.pw_passwd = sgetsave(p->pw_passwd); 500 save.pw_gecos = sgetsave(p->pw_gecos); 501 save.pw_dir = sgetsave(p->pw_dir); 502 save.pw_shell = sgetsave(p->pw_shell); 503 return (&save); 504} 505 506static int login_attempts; /* number of failed login attempts */ 507static int askpasswd; /* had user command, ask for passwd */ 508static char curname[10]; /* current USER name */ 509 510/* 511 * USER command. 512 * Sets global passwd pointer pw if named account exists and is acceptable; 513 * sets askpasswd if a PASS command is expected. If logged in previously, 514 * need to reset state. If name is "ftp" or "anonymous", the name is not in 515 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 516 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 517 * requesting login privileges. Disallow anyone who does not have a standard 518 * shell as returned by getusershell(). Disallow anyone mentioned in the file 519 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 520 */ 521void 522user(name) 523 char *name; 524{ 525 char *cp, *shell; 526 527 if (logged_in) { 528 if (guest) { 529 reply(530, "Can't change user from guest login."); 530 return; 531 } else if (dochroot) { 532 reply(530, "Can't change user from chroot user."); 533 return; 534 } 535 end_login(); 536 } 537 538 guest = 0; 539 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 540 if (checkuser(_PATH_FTPUSERS, "ftp") || 541 checkuser(_PATH_FTPUSERS, "anonymous")) 542 reply(530, "User %s access denied.", name); 543 else if ((pw = sgetpwnam("ftp")) != NULL) { 544 guest = 1; 545 askpasswd = 1; 546 reply(331, 547 "Guest login ok, type your name as password."); 548 } else 549 reply(530, "User %s unknown.", name); 550 if (!askpasswd && logging) 551 syslog(LOG_NOTICE, 552 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 553 return; 554 } 555 if (pw = sgetpwnam(name)) { 556 if ((shell = pw->pw_shell) == NULL || *shell == 0) 557 shell = _PATH_BSHELL; 558 while ((cp = getusershell()) != NULL) 559 if (strcmp(cp, shell) == 0) 560 break; 561 endusershell(); 562 563 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 564 reply(530, "User %s access denied.", name); 565 if (logging) 566 syslog(LOG_NOTICE, 567 "FTP LOGIN REFUSED FROM %s, %s", 568 remotehost, name); 569 pw = (struct passwd *) NULL; 570 return; 571 } 572 } 573 if (logging) 574 strncpy(curname, name, sizeof(curname)-1); 575#ifdef SKEY 576 if (!skey_haskey(name)) { 577 char *myskey, *skey_keyinfo __P((char *name)); 578 579 myskey = skey_keyinfo(name); 580 reply(331, "Password [%s] for %s required.", 581 myskey ? myskey : "error getting challenge", name); 582 } else 583#endif 584 reply(331, "Password required for %s.", name); 585 586 askpasswd = 1; 587 /* 588 * Delay before reading passwd after first failed 589 * attempt to slow down passwd-guessing programs. 590 */ 591 if (login_attempts) 592 sleep((unsigned) login_attempts); 593} 594 595/* 596 * Check if a user is in the file "fname" 597 */ 598static int 599checkuser(fname, name) 600 char *fname; 601 char *name; 602{ 603 FILE *fd; 604 int found = 0; 605 char *p, line[BUFSIZ]; 606 607 if ((fd = fopen(fname, "r")) != NULL) { 608 while (fgets(line, sizeof(line), fd) != NULL) 609 if ((p = strchr(line, '\n')) != NULL) { 610 *p = '\0'; 611 if (line[0] == '#') 612 continue; 613 if (strcmp(line, name) == 0) { 614 found = 1; 615 break; 616 } 617 } 618 (void) fclose(fd); 619 } 620 return (found); 621} 622 623/* 624 * Terminate login as previous user, if any, resetting state; 625 * used when USER command is given or login fails. 626 */ 627static void 628end_login() 629{ 630 631 (void) seteuid((uid_t)0); 632 if (logged_in) { 633 logwtmp(ttyline, "", ""); 634 if (doutmp) 635 logout(utmp.ut_line); 636 } 637 pw = NULL; 638 logged_in = 0; 639 guest = 0; 640 dochroot = 0; 641} 642 643void 644pass(passwd) 645 char *passwd; 646{ 647 int rval; 648 FILE *fd; 649 650 if (logged_in || askpasswd == 0) { 651 reply(503, "Login with USER first."); 652 return; 653 } 654 askpasswd = 0; 655 if (!guest) { /* "ftp" is only account allowed no password */ 656 if (pw == NULL) { 657 rval = 1; /* failure below */ 658 goto skip; 659 } 660#if defined(KERBEROS) 661 rval = klogin(pw, "", hostname, passwd); 662 if (rval == 0) 663 goto skip; 664#endif 665#ifdef SKEY 666 if (skey_haskey(pw->pw_name) == 0 && 667 (skey_passcheck(pw->pw_name, passwd) != -1)) { 668 rval = 0; 669 goto skip; 670 } 671#endif 672 /* the strcmp does not catch null passwords! */ 673 if (pw == NULL || *pw->pw_passwd == '\0' || 674 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 675 rval = 1; /* failure */ 676 goto skip; 677 } 678 rval = 0; 679 680skip: 681 /* 682 * If rval == 1, the user failed the authentication check 683 * above. If rval == 0, either Kerberos or local authentication 684 * succeeded. 685 */ 686 if (rval) { 687 reply(530, "Login incorrect."); 688 if (logging) 689 syslog(LOG_NOTICE, 690 "FTP LOGIN FAILED FROM %s, %s", 691 remotehost, curname); 692 pw = NULL; 693 if (login_attempts++ >= 5) { 694 syslog(LOG_NOTICE, 695 "repeated login failures from %s", 696 remotehost); 697 exit(0); 698 } 699 return; 700 } 701 } 702 login_attempts = 0; /* this time successful */ 703 if (setegid((gid_t)pw->pw_gid) < 0) { 704 reply(550, "Can't set gid."); 705 return; 706 } 707 (void) initgroups(pw->pw_name, pw->pw_gid); 708 709 /* open wtmp before chroot */ 710 logwtmp(ttyline, pw->pw_name, remotehost); 711 712 /* open utmp before chroot */ 713 if (doutmp) { 714 memset((void *)&utmp, 0, sizeof(utmp)); 715 (void)time(&utmp.ut_time); 716 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 717 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 718 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 719 login(&utmp); 720 } 721 722#ifdef STATS 723 /* open stats file before chroot */ 724 if (guest && (stats == 1) && (statfd < 0)) 725 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 726 stats = 0; 727#endif 728 729 logged_in = 1; 730 731 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 732 if (guest) { 733 /* 734 * We MUST do a chdir() after the chroot. Otherwise 735 * the old current directory will be accessible as "." 736 * outside the new root! 737 */ 738 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 739 reply(550, "Can't set guest privileges."); 740 goto bad; 741 } 742 } else if (dochroot) { 743 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 744 reply(550, "Can't change root."); 745 goto bad; 746 } 747 } else if (chdir(pw->pw_dir) < 0) { 748 if (chdir("/") < 0) { 749 reply(530, "User %s: can't change directory to %s.", 750 pw->pw_name, pw->pw_dir); 751 goto bad; 752 } else 753 lreply(230, "No directory! Logging in with home=/"); 754 } 755 if (seteuid((uid_t)pw->pw_uid) < 0) { 756 reply(550, "Can't set uid."); 757 goto bad; 758 } 759 /* 760 * Display a login message, if it exists. 761 * N.B. reply(230,) must follow the message. 762 */ 763 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 764 char *cp, line[LINE_MAX]; 765 766 while (fgets(line, sizeof(line), fd) != NULL) { 767 if ((cp = strchr(line, '\n')) != NULL) 768 *cp = '\0'; 769 lreply(230, "%s", line); 770 } 771 (void) fflush(stdout); 772 (void) fclose(fd); 773 } 774 if (guest) { 775#ifdef STATS 776 if (ident != NULL) 777 free(ident); 778 ident = strdup(passwd); 779 if (ident == (char *)NULL) 780 fatal("Ran out of memory."); 781#endif 782 reply(230, "Guest login ok, access restrictions apply."); 783#ifdef HASSETPROCTITLE 784 snprintf(proctitle, sizeof(proctitle), 785 "%s: anonymous/%.*s", remotehost, 786 sizeof(proctitle) - sizeof(remotehost) - 787 sizeof(": anonymous/"), passwd); 788 setproctitle(proctitle); 789#endif /* HASSETPROCTITLE */ 790 if (logging) 791 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 792 remotehost, passwd); 793 } else { 794 reply(230, "User %s logged in.", pw->pw_name); 795#ifdef HASSETPROCTITLE 796 snprintf(proctitle, sizeof(proctitle), 797 "%s: %s", remotehost, pw->pw_name); 798 setproctitle(proctitle); 799#endif /* HASSETPROCTITLE */ 800 if (logging) 801 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 802 remotehost, pw->pw_name); 803 } 804 (void) umask(defumask); 805 return; 806bad: 807 /* Forget all about it... */ 808 end_login(); 809} 810 811void 812retrieve(cmd, name) 813 char *cmd, *name; 814{ 815 FILE *fin, *dout; 816 struct stat st; 817 int (*closefunc) __P((FILE *)); 818#ifdef STATS 819 time_t start; 820#endif 821 822 if (cmd == 0) { 823 fin = fopen(name, "r"), closefunc = fclose; 824 st.st_size = 0; 825 } else { 826 char line[BUFSIZ]; 827 828 (void) sprintf(line, cmd, name), name = line; 829 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 830 st.st_size = -1; 831 st.st_blksize = BUFSIZ; 832 } 833 if (fin == NULL) { 834 if (errno != 0) { 835 perror_reply(550, name); 836 if (cmd == 0) { 837 LOGCMD("get", name); 838 } 839 } 840 return; 841 } 842 byte_count = -1; 843 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 844 reply(550, "%s: not a plain file.", name); 845 goto done; 846 } 847 if (restart_point) { 848 if (type == TYPE_A) { 849 off_t i, n; 850 int c; 851 852 n = restart_point; 853 i = 0; 854 while (i++ < n) { 855 if ((c=getc(fin)) == EOF) { 856 perror_reply(550, name); 857 goto done; 858 } 859 if (c == '\n') 860 i++; 861 } 862 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 863 perror_reply(550, name); 864 goto done; 865 } 866 } 867 dout = dataconn(name, st.st_size, "w"); 868 if (dout == NULL) 869 goto done; 870#ifdef STATS 871 time(&start); 872#endif 873 send_data(fin, dout, st.st_blksize, st.st_size, 874 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 875#ifdef STATS 876 if ((cmd == 0) && guest && stats) 877 logxfer(name, st.st_size, start); 878#endif 879 (void) fclose(dout); 880 data = -1; 881 pdata = -1; 882done: 883 if (cmd == 0) 884 LOGBYTES("get", name, byte_count); 885 (*closefunc)(fin); 886} 887 888void 889store(name, mode, unique) 890 char *name, *mode; 891 int unique; 892{ 893 FILE *fout, *din; 894 struct stat st; 895 int (*closefunc) __P((FILE *)); 896 897 if (unique && stat(name, &st) == 0 && 898 (name = gunique(name)) == NULL) { 899 LOGCMD(*mode == 'w' ? "put" : "append", name); 900 return; 901 } 902 903 if (restart_point) 904 mode = "r+"; 905 fout = fopen(name, mode); 906 closefunc = fclose; 907 if (fout == NULL) { 908 perror_reply(553, name); 909 LOGCMD(*mode == 'w' ? "put" : "append", name); 910 return; 911 } 912 byte_count = -1; 913 if (restart_point) { 914 if (type == TYPE_A) { 915 off_t i, n; 916 int c; 917 918 n = restart_point; 919 i = 0; 920 while (i++ < n) { 921 if ((c=getc(fout)) == EOF) { 922 perror_reply(550, name); 923 goto done; 924 } 925 if (c == '\n') 926 i++; 927 } 928 /* 929 * We must do this seek to "current" position 930 * because we are changing from reading to 931 * writing. 932 */ 933 if (fseek(fout, 0L, L_INCR) < 0) { 934 perror_reply(550, name); 935 goto done; 936 } 937 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 938 perror_reply(550, name); 939 goto done; 940 } 941 } 942 din = dataconn(name, (off_t)-1, "r"); 943 if (din == NULL) 944 goto done; 945 if (receive_data(din, fout) == 0) { 946 if (unique) 947 reply(226, "Transfer complete (unique file name:%s).", 948 name); 949 else 950 reply(226, "Transfer complete."); 951 } 952 (void) fclose(din); 953 data = -1; 954 pdata = -1; 955done: 956 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 957 (*closefunc)(fout); 958} 959 960static FILE * 961getdatasock(mode) 962 char *mode; 963{ 964 int on = 1, s, t, tries; 965 966 if (data >= 0) 967 return (fdopen(data, mode)); 968 (void) seteuid((uid_t)0); 969 s = socket(AF_INET, SOCK_STREAM, 0); 970 if (s < 0) 971 goto bad; 972 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 973 (char *) &on, sizeof(on)) < 0) 974 goto bad; 975 /* anchor socket to avoid multi-homing problems */ 976 data_source.sin_len = sizeof(struct sockaddr_in); 977 data_source.sin_family = AF_INET; 978 data_source.sin_addr = ctrl_addr.sin_addr; 979 for (tries = 1; ; tries++) { 980 if (bind(s, (struct sockaddr *)&data_source, 981 sizeof(data_source)) >= 0) 982 break; 983 if (errno != EADDRINUSE || tries > 10) 984 goto bad; 985 sleep(tries); 986 } 987 (void) seteuid((uid_t)pw->pw_uid); 988#ifdef IP_TOS 989 on = IPTOS_THROUGHPUT; 990 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 991 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 992#endif 993 return (fdopen(s, mode)); 994bad: 995 /* Return the real value of errno (close may change it) */ 996 t = errno; 997 (void) seteuid((uid_t)pw->pw_uid); 998 (void) close(s); 999 errno = t; 1000 return (NULL); 1001} 1002 1003static FILE * 1004dataconn(name, size, mode) 1005 char *name; 1006 off_t size; 1007 char *mode; 1008{ 1009 char sizebuf[32]; 1010 FILE *file; 1011 int retry = 0, tos; 1012 1013 file_size = size; 1014 byte_count = 0; 1015 if (size != (off_t) -1) 1016 (void) sprintf(sizebuf, " (%qd bytes)", size); 1017 else 1018 (void) strcpy(sizebuf, ""); 1019 if (pdata >= 0) { 1020 struct sockaddr_in from; 1021 int s, fromlen = sizeof(from); 1022 1023 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1024 if (s < 0) { 1025 reply(425, "Can't open data connection."); 1026 (void) close(pdata); 1027 pdata = -1; 1028 return (NULL); 1029 } 1030 if (ntohs(from.sin_port) < IPPORT_RESERVED) { 1031 perror_reply(425, "Can't build data connection"); 1032 (void) close(pdata); 1033 (void) close(s); 1034 pdata = -1; 1035 return (NULL); 1036 } 1037 if (from.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1038 perror_reply(435, "Can't build data connection"); 1039 (void) close(pdata); 1040 (void) close(s); 1041 pdata = -1; 1042 return (NULL); 1043 } 1044 (void) close(pdata); 1045 pdata = s; 1046#ifdef IP_TOS 1047 tos = IPTOS_THROUGHPUT; 1048 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1049 sizeof(int)); 1050#endif 1051 reply(150, "Opening %s mode data connection for '%s'%s.", 1052 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1053 return (fdopen(pdata, mode)); 1054 } 1055 if (data >= 0) { 1056 reply(125, "Using existing data connection for '%s'%s.", 1057 name, sizebuf); 1058 usedefault = 1; 1059 return (fdopen(data, mode)); 1060 } 1061 if (usedefault) 1062 data_dest = his_addr; 1063 usedefault = 1; 1064 file = getdatasock(mode); 1065 if (file == NULL) { 1066 reply(425, "Can't create data socket (%s,%d): %s.", 1067 inet_ntoa(data_source.sin_addr), 1068 ntohs(data_source.sin_port), strerror(errno)); 1069 return (NULL); 1070 } 1071 data = fileno(file); 1072 1073 /* 1074 * attempt to connect to reserved port on client machine; 1075 * this looks like an attack 1076 */ 1077 if (ntohs(data_dest.sin_port) < IPPORT_RESERVED) { 1078 perror_reply(425, "Can't build data connection"); 1079 (void) fclose(file); 1080 data = -1; 1081 return NULL; 1082 } 1083 if (data_dest.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1084 perror_reply(435, "Can't build data connection"); 1085 (void) fclose(file); 1086 data = -1; 1087 return NULL; 1088 } 1089 while (connect(data, (struct sockaddr *)&data_dest, 1090 sizeof(data_dest)) < 0) { 1091 if (errno == EADDRINUSE && retry < swaitmax) { 1092 sleep((unsigned) swaitint); 1093 retry += swaitint; 1094 continue; 1095 } 1096 perror_reply(425, "Can't build data connection"); 1097 (void) fclose(file); 1098 data = -1; 1099 return (NULL); 1100 } 1101 reply(150, "Opening %s mode data connection for '%s'%s.", 1102 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1103 return (file); 1104} 1105 1106/* 1107 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1108 * encapsulation of the data subject to Mode, Structure, and Type. 1109 * 1110 * NB: Form isn't handled. 1111 */ 1112static void 1113send_data(instr, outstr, blksize, filesize, isreg) 1114 FILE *instr, *outstr; 1115 off_t blksize; 1116 off_t filesize; 1117 int isreg; 1118{ 1119 int c, cnt, filefd, netfd; 1120 char *buf, *bp; 1121 size_t len; 1122 1123 transflag++; 1124 if (setjmp(urgcatch)) { 1125 transflag = 0; 1126 return; 1127 } 1128 switch (type) { 1129 1130 case TYPE_A: 1131 while ((c = getc(instr)) != EOF) { 1132 byte_count++; 1133 if (c == '\n') { 1134 if (ferror(outstr)) 1135 goto data_err; 1136 (void) putc('\r', outstr); 1137 } 1138 (void) putc(c, outstr); 1139 } 1140 fflush(outstr); 1141 transflag = 0; 1142 if (ferror(instr)) 1143 goto file_err; 1144 if (ferror(outstr)) 1145 goto data_err; 1146 reply(226, "Transfer complete."); 1147 return; 1148 1149 case TYPE_I: 1150 case TYPE_L: 1151 /* 1152 * isreg is only set if we are not doing restart and we 1153 * are sending a regular file 1154 */ 1155 netfd = fileno(outstr); 1156 filefd = fileno(instr); 1157 1158 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1159 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1160 (off_t)0); 1161 if (!buf) { 1162 syslog(LOG_WARNING, "mmap(%lu): %m", 1163 (unsigned long)filesize); 1164 goto oldway; 1165 } 1166 bp = buf; 1167 len = filesize; 1168 do { 1169 cnt = write(netfd, bp, len); 1170 len -= cnt; 1171 bp += cnt; 1172 if (cnt > 0) byte_count += cnt; 1173 } while(cnt > 0 && len > 0); 1174 1175 transflag = 0; 1176 munmap(buf, (size_t)filesize); 1177 if (cnt < 0) 1178 goto data_err; 1179 reply(226, "Transfer complete."); 1180 return; 1181 } 1182 1183oldway: 1184 if ((buf = malloc((u_int)blksize)) == NULL) { 1185 transflag = 0; 1186 perror_reply(451, "Local resource failure: malloc"); 1187 return; 1188 } 1189 1190 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1191 write(netfd, buf, cnt) == cnt) 1192 byte_count += cnt; 1193 transflag = 0; 1194 (void)free(buf); 1195 if (cnt != 0) { 1196 if (cnt < 0) 1197 goto file_err; 1198 goto data_err; 1199 } 1200 reply(226, "Transfer complete."); 1201 return; 1202 default: 1203 transflag = 0; 1204 reply(550, "Unimplemented TYPE %d in send_data", type); 1205 return; 1206 } 1207 1208data_err: 1209 transflag = 0; 1210 perror_reply(426, "Data connection"); 1211 return; 1212 1213file_err: 1214 transflag = 0; 1215 perror_reply(551, "Error on input file"); 1216} 1217 1218/* 1219 * Transfer data from peer to "outstr" using the appropriate encapulation of 1220 * the data subject to Mode, Structure, and Type. 1221 * 1222 * N.B.: Form isn't handled. 1223 */ 1224static int 1225receive_data(instr, outstr) 1226 FILE *instr, *outstr; 1227{ 1228 int c; 1229 int cnt, bare_lfs = 0; 1230 char buf[BUFSIZ]; 1231 1232 transflag++; 1233 if (setjmp(urgcatch)) { 1234 transflag = 0; 1235 return (-1); 1236 } 1237 switch (type) { 1238 1239 case TYPE_I: 1240 case TYPE_L: 1241 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1242 if (write(fileno(outstr), buf, cnt) != cnt) 1243 goto file_err; 1244 byte_count += cnt; 1245 } 1246 if (cnt < 0) 1247 goto data_err; 1248 transflag = 0; 1249 return (0); 1250 1251 case TYPE_E: 1252 reply(553, "TYPE E not implemented."); 1253 transflag = 0; 1254 return (-1); 1255 1256 case TYPE_A: 1257 while ((c = getc(instr)) != EOF) { 1258 byte_count++; 1259 if (c == '\n') 1260 bare_lfs++; 1261 while (c == '\r') { 1262 if (ferror(outstr)) 1263 goto data_err; 1264 if ((c = getc(instr)) != '\n') { 1265 (void) putc ('\r', outstr); 1266 if (c == '\0' || c == EOF) 1267 goto contin2; 1268 } 1269 } 1270 (void) putc(c, outstr); 1271 contin2: ; 1272 } 1273 fflush(outstr); 1274 if (ferror(instr)) 1275 goto data_err; 1276 if (ferror(outstr)) 1277 goto file_err; 1278 transflag = 0; 1279 if (bare_lfs) { 1280 lreply(226, 1281 "WARNING! %d bare linefeeds received in ASCII mode", 1282 bare_lfs); 1283 (void)printf(" File may not have transferred correctly.\r\n"); 1284 } 1285 return (0); 1286 default: 1287 reply(550, "Unimplemented TYPE %d in receive_data", type); 1288 transflag = 0; 1289 return (-1); 1290 } 1291 1292data_err: 1293 transflag = 0; 1294 perror_reply(426, "Data Connection"); 1295 return (-1); 1296 1297file_err: 1298 transflag = 0; 1299 perror_reply(452, "Error writing file"); 1300 return (-1); 1301} 1302 1303void 1304statfilecmd(filename) 1305 char *filename; 1306{ 1307 FILE *fin; 1308 int c; 1309 char line[LINE_MAX]; 1310 1311 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1312 fin = ftpd_popen(line, "r"); 1313 lreply(211, "status of %s:", filename); 1314 while ((c = getc(fin)) != EOF) { 1315 if (c == '\n') { 1316 if (ferror(stdout)){ 1317 perror_reply(421, "control connection"); 1318 (void) ftpd_pclose(fin); 1319 dologout(1); 1320 /* NOTREACHED */ 1321 } 1322 if (ferror(fin)) { 1323 perror_reply(551, filename); 1324 (void) ftpd_pclose(fin); 1325 return; 1326 } 1327 (void) putc('\r', stdout); 1328 } 1329 (void) putc(c, stdout); 1330 } 1331 (void) ftpd_pclose(fin); 1332 reply(211, "End of Status"); 1333} 1334 1335void 1336statcmd() 1337{ 1338 struct sockaddr_in *sin; 1339 u_char *a, *p; 1340 1341 lreply(211, "%s FTP server status:", hostname, version); 1342 printf(" %s\r\n", version); 1343 printf(" Connected to %s", remotehost); 1344 if (!isdigit(remotehost[0])) 1345 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1346 printf("\r\n"); 1347 if (logged_in) { 1348 if (guest) 1349 printf(" Logged in anonymously\r\n"); 1350 else 1351 printf(" Logged in as %s\r\n", pw->pw_name); 1352 } else if (askpasswd) 1353 printf(" Waiting for password\r\n"); 1354 else 1355 printf(" Waiting for user name\r\n"); 1356 printf(" TYPE: %s", typenames[type]); 1357 if (type == TYPE_A || type == TYPE_E) 1358 printf(", FORM: %s", formnames[form]); 1359 if (type == TYPE_L) 1360#if NBBY == 8 1361 printf(" %d", NBBY); 1362#else 1363 printf(" %d", bytesize); /* need definition! */ 1364#endif 1365 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1366 strunames[stru], modenames[mode]); 1367 if (data != -1) 1368 printf(" Data connection open\r\n"); 1369 else if (pdata != -1) { 1370 printf(" in Passive mode"); 1371 sin = &pasv_addr; 1372 goto printaddr; 1373 } else if (usedefault == 0) { 1374 printf(" PORT"); 1375 sin = &data_dest; 1376printaddr: 1377 a = (u_char *) &sin->sin_addr; 1378 p = (u_char *) &sin->sin_port; 1379#define UC(b) (((int) b) & 0xff) 1380 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1381 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1382#undef UC 1383 } else 1384 printf(" No data connection\r\n"); 1385 reply(211, "End of status"); 1386} 1387 1388void 1389fatal(s) 1390 char *s; 1391{ 1392 1393 reply(451, "Error in server: %s\n", s); 1394 reply(221, "Closing connection due to server error."); 1395 dologout(0); 1396 /* NOTREACHED */ 1397} 1398 1399void 1400#if __STDC__ 1401reply(int n, const char *fmt, ...) 1402#else 1403reply(n, fmt, va_alist) 1404 int n; 1405 char *fmt; 1406 va_dcl 1407#endif 1408{ 1409 va_list ap; 1410#if __STDC__ 1411 va_start(ap, fmt); 1412#else 1413 va_start(ap); 1414#endif 1415 (void)printf("%d ", n); 1416 (void)vprintf(fmt, ap); 1417 (void)printf("\r\n"); 1418 (void)fflush(stdout); 1419 if (debug) { 1420 syslog(LOG_DEBUG, "<--- %d ", n); 1421 vsyslog(LOG_DEBUG, fmt, ap); 1422 } 1423} 1424 1425void 1426#if __STDC__ 1427lreply(int n, const char *fmt, ...) 1428#else 1429lreply(n, fmt, va_alist) 1430 int n; 1431 char *fmt; 1432 va_dcl 1433#endif 1434{ 1435 va_list ap; 1436#if __STDC__ 1437 va_start(ap, fmt); 1438#else 1439 va_start(ap); 1440#endif 1441 (void)printf("%d- ", n); 1442 (void)vprintf(fmt, ap); 1443 (void)printf("\r\n"); 1444 (void)fflush(stdout); 1445 if (debug) { 1446 syslog(LOG_DEBUG, "<--- %d- ", n); 1447 vsyslog(LOG_DEBUG, fmt, ap); 1448 } 1449} 1450 1451static void 1452ack(s) 1453 char *s; 1454{ 1455 1456 reply(250, "%s command successful.", s); 1457} 1458 1459void 1460nack(s) 1461 char *s; 1462{ 1463 1464 reply(502, "%s command not implemented.", s); 1465} 1466 1467/* ARGSUSED */ 1468void 1469yyerror(s) 1470 char *s; 1471{ 1472 char *cp; 1473 1474 if (cp = strchr(cbuf,'\n')) 1475 *cp = '\0'; 1476 reply(500, "'%s': command not understood.", cbuf); 1477} 1478 1479void 1480delete(name) 1481 char *name; 1482{ 1483 struct stat st; 1484 1485 LOGCMD("delete", name); 1486 if (stat(name, &st) < 0) { 1487 perror_reply(550, name); 1488 return; 1489 } 1490 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1491 if (rmdir(name) < 0) { 1492 perror_reply(550, name); 1493 return; 1494 } 1495 goto done; 1496 } 1497 if (unlink(name) < 0) { 1498 perror_reply(550, name); 1499 return; 1500 } 1501done: 1502 ack("DELE"); 1503} 1504 1505void 1506cwd(path) 1507 char *path; 1508{ 1509 1510 if (chdir(path) < 0) 1511 perror_reply(550, path); 1512 else 1513 ack("CWD"); 1514} 1515 1516void 1517makedir(name) 1518 char *name; 1519{ 1520 1521 LOGCMD("mkdir", name); 1522 if (mkdir(name, 0777) < 0) 1523 perror_reply(550, name); 1524 else 1525 reply(257, "MKD command successful."); 1526} 1527 1528void 1529removedir(name) 1530 char *name; 1531{ 1532 1533 LOGCMD("rmdir", name); 1534 if (rmdir(name) < 0) 1535 perror_reply(550, name); 1536 else 1537 ack("RMD"); 1538} 1539 1540void 1541pwd() 1542{ 1543 char path[MAXPATHLEN + 1]; 1544 1545 if (getwd(path) == (char *)NULL) 1546 reply(550, "%s.", path); 1547 else 1548 reply(257, "\"%s\" is current directory.", path); 1549} 1550 1551char * 1552renamefrom(name) 1553 char *name; 1554{ 1555 struct stat st; 1556 1557 if (stat(name, &st) < 0) { 1558 perror_reply(550, name); 1559 return ((char *)0); 1560 } 1561 reply(350, "File exists, ready for destination name"); 1562 return (name); 1563} 1564 1565void 1566renamecmd(from, to) 1567 char *from, *to; 1568{ 1569 1570 LOGCMD2("rename", from, to); 1571 if (rename(from, to) < 0) 1572 perror_reply(550, "rename"); 1573 else 1574 ack("RNTO"); 1575} 1576 1577static void 1578dolog(sin) 1579 struct sockaddr_in *sin; 1580{ 1581 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1582 sizeof(struct in_addr), AF_INET); 1583 1584 if (hp) 1585 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1586 else 1587 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1588 sizeof(remotehost)); 1589#ifdef HASSETPROCTITLE 1590 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1591 setproctitle(proctitle); 1592#endif /* HASSETPROCTITLE */ 1593 1594 if (logging) 1595 syslog(LOG_INFO, "connection from %s", remotehost); 1596} 1597 1598/* 1599 * Record logout in wtmp file 1600 * and exit with supplied status. 1601 */ 1602void 1603dologout(status) 1604 int status; 1605{ 1606 1607 if (logged_in) { 1608 (void) seteuid((uid_t)0); 1609 logwtmp(ttyline, "", ""); 1610 if (doutmp) 1611 logout(utmp.ut_line); 1612#if defined(KERBEROS) 1613 if (!notickets && krbtkfile_env) 1614 unlink(krbtkfile_env); 1615#endif 1616 } 1617 /* beware of flushing buffers after a SIGPIPE */ 1618 _exit(status); 1619} 1620 1621static void 1622myoob(signo) 1623 int signo; 1624{ 1625 char *cp; 1626 1627 /* only process if transfer occurring */ 1628 if (!transflag) 1629 return; 1630 cp = tmpline; 1631 if (getline(cp, 7, stdin) == NULL) { 1632 reply(221, "You could at least say goodbye."); 1633 dologout(0); 1634 } 1635 upper(cp); 1636 if (strcmp(cp, "ABOR\r\n") == 0) { 1637 tmpline[0] = '\0'; 1638 reply(426, "Transfer aborted. Data connection closed."); 1639 reply(226, "Abort successful"); 1640 longjmp(urgcatch, 1); 1641 } 1642 if (strcmp(cp, "STAT\r\n") == 0) { 1643 if (file_size != (off_t) -1) 1644 reply(213, "Status: %qd of %qd bytes transferred", 1645 byte_count, file_size); 1646 else 1647 reply(213, "Status: %qd bytes transferred", byte_count); 1648 } 1649} 1650 1651/* 1652 * Note: a response of 425 is not mentioned as a possible response to 1653 * the PASV command in RFC959. However, it has been blessed as 1654 * a legitimate response by Jon Postel in a telephone conversation 1655 * with Rick Adams on 25 Jan 89. 1656 */ 1657void 1658passive() 1659{ 1660 int len; 1661 char *p, *a; 1662 1663 pdata = socket(AF_INET, SOCK_STREAM, 0); 1664 if (pdata < 0) { 1665 perror_reply(425, "Can't open passive connection"); 1666 return; 1667 } 1668 pasv_addr = ctrl_addr; 1669 pasv_addr.sin_port = 0; 1670 (void) seteuid((uid_t)0); 1671 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1672 (void) seteuid((uid_t)pw->pw_uid); 1673 goto pasv_error; 1674 } 1675 (void) seteuid((uid_t)pw->pw_uid); 1676 len = sizeof(pasv_addr); 1677 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1678 goto pasv_error; 1679 if (listen(pdata, 1) < 0) 1680 goto pasv_error; 1681 a = (char *) &pasv_addr.sin_addr; 1682 p = (char *) &pasv_addr.sin_port; 1683 1684#define UC(b) (((int) b) & 0xff) 1685 1686 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1687 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1688 return; 1689 1690pasv_error: 1691 (void) close(pdata); 1692 pdata = -1; 1693 perror_reply(425, "Can't open passive connection"); 1694 return; 1695} 1696 1697/* 1698 * Generate unique name for file with basename "local". 1699 * The file named "local" is already known to exist. 1700 * Generates failure reply on error. 1701 */ 1702static char * 1703gunique(local) 1704 char *local; 1705{ 1706 static char new[MAXPATHLEN]; 1707 struct stat st; 1708 int count; 1709 char *cp; 1710 1711 cp = strrchr(local, '/'); 1712 if (cp) 1713 *cp = '\0'; 1714 if (stat(cp ? local : ".", &st) < 0) { 1715 perror_reply(553, cp ? local : "."); 1716 return ((char *) 0); 1717 } 1718 if (cp) 1719 *cp = '/'; 1720 (void) strcpy(new, local); 1721 cp = new + strlen(new); 1722 *cp++ = '.'; 1723 for (count = 1; count < 100; count++) { 1724 (void)sprintf(cp, "%d", count); 1725 if (stat(new, &st) < 0) 1726 return (new); 1727 } 1728 reply(452, "Unique file name cannot be created."); 1729 return (NULL); 1730} 1731 1732/* 1733 * Format and send reply containing system error number. 1734 */ 1735void 1736perror_reply(code, string) 1737 int code; 1738 char *string; 1739{ 1740 1741 reply(code, "%s: %s.", string, strerror(errno)); 1742} 1743 1744static char *onefile[] = { 1745 "", 1746 0 1747}; 1748 1749void 1750send_file_list(whichf) 1751 char *whichf; 1752{ 1753 struct stat st; 1754 DIR *dirp = NULL; 1755 struct dirent *dir; 1756 FILE *dout = NULL; 1757 char **dirlist, *dirname; 1758 int simple = 0; 1759 int freeglob = 0; 1760 glob_t gl; 1761 1762 if (strpbrk(whichf, "~{[*?") != NULL) { 1763 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1764 1765 memset(&gl, 0, sizeof(gl)); 1766 freeglob = 1; 1767 if (glob(whichf, flags, 0, &gl)) { 1768 reply(550, "not found"); 1769 goto out; 1770 } else if (gl.gl_pathc == 0) { 1771 errno = ENOENT; 1772 perror_reply(550, whichf); 1773 goto out; 1774 } 1775 dirlist = gl.gl_pathv; 1776 } else { 1777 onefile[0] = whichf; 1778 dirlist = onefile; 1779 simple = 1; 1780 } 1781 1782 if (setjmp(urgcatch)) { 1783 transflag = 0; 1784 goto out; 1785 } 1786 while (dirname = *dirlist++) { 1787 if (stat(dirname, &st) < 0) { 1788 /* 1789 * If user typed "ls -l", etc, and the client 1790 * used NLST, do what the user meant. 1791 */ 1792 if (dirname[0] == '-' && *dirlist == NULL && 1793 transflag == 0) { 1794 retrieve("/bin/ls %s", dirname); 1795 goto out; 1796 } 1797 perror_reply(550, whichf); 1798 if (dout != NULL) { 1799 (void) fclose(dout); 1800 transflag = 0; 1801 data = -1; 1802 pdata = -1; 1803 } 1804 goto out; 1805 } 1806 1807 if (S_ISREG(st.st_mode)) { 1808 if (dout == NULL) { 1809 dout = dataconn("file list", (off_t)-1, "w"); 1810 if (dout == NULL) 1811 goto out; 1812 transflag++; 1813 } 1814 fprintf(dout, "%s%s\n", dirname, 1815 type == TYPE_A ? "\r" : ""); 1816 byte_count += strlen(dirname) + 1; 1817 continue; 1818 } else if (!S_ISDIR(st.st_mode)) 1819 continue; 1820 1821 if ((dirp = opendir(dirname)) == NULL) 1822 continue; 1823 1824 while ((dir = readdir(dirp)) != NULL) { 1825 char nbuf[MAXPATHLEN]; 1826 1827 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1828 continue; 1829 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1830 dir->d_namlen == 2) 1831 continue; 1832 1833 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1834 1835 /* 1836 * We have to do a stat to insure it's 1837 * not a directory or special file. 1838 */ 1839 if (simple || (stat(nbuf, &st) == 0 && 1840 S_ISREG(st.st_mode))) { 1841 if (dout == NULL) { 1842 dout = dataconn("file list", (off_t)-1, 1843 "w"); 1844 if (dout == NULL) 1845 goto out; 1846 transflag++; 1847 } 1848 if (nbuf[0] == '.' && nbuf[1] == '/') 1849 fprintf(dout, "%s%s\n", &nbuf[2], 1850 type == TYPE_A ? "\r" : ""); 1851 else 1852 fprintf(dout, "%s%s\n", nbuf, 1853 type == TYPE_A ? "\r" : ""); 1854 byte_count += strlen(nbuf) + 1; 1855 } 1856 } 1857 (void) closedir(dirp); 1858 } 1859 1860 if (dout == NULL) 1861 reply(550, "No files found."); 1862 else if (ferror(dout) != 0) 1863 perror_reply(550, "Data connection"); 1864 else 1865 reply(226, "Transfer complete."); 1866 1867 transflag = 0; 1868 if (dout != NULL) 1869 (void) fclose(dout); 1870 data = -1; 1871 pdata = -1; 1872out: 1873 if (freeglob) { 1874 freeglob = 0; 1875 globfree(&gl); 1876 } 1877} 1878 1879static void 1880reapchild(signo) 1881 int signo; 1882{ 1883 while (wait3(NULL, WNOHANG, NULL) > 0); 1884} 1885 1886#ifdef STATS 1887void 1888logxfer(name, size, start) 1889 char *name; 1890 off_t size; 1891 time_t start; 1892{ 1893 char buf[1024]; 1894 char path[MAXPATHLEN + 1]; 1895 time_t now; 1896 1897 if ((statfd >= 0) && (getwd(path) != NULL)) { 1898 time(&now); 1899 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 1900 ctime(&now)+4, ident, remotehost, 1901 path, name, size, now - start + (now == start)); 1902 write(statfd, buf, strlen(buf)); 1903 } 1904} 1905#endif 1906