ftpd.c revision 1.21
1/* $OpenBSD: ftpd.c,v 1.21 1996/09/29 22:11:50 millert 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 6.1/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 multihome = 0; 123int guest; 124int stats; 125int statfd = -1; 126int dochroot; 127int type; 128int form; 129int stru; /* avoid C keyword */ 130int mode; 131int doutmp = 0; /* update utmp file */ 132int usedefault = 1; /* for data transfers */ 133int pdata = -1; /* for passive mode */ 134sig_atomic_t transflag; 135off_t file_size; 136off_t byte_count; 137#if !defined(CMASK) || CMASK == 0 138#undef CMASK 139#define CMASK 027 140#endif 141int defumask = CMASK; /* default umask value */ 142char tmpline[7]; 143char hostname[MAXHOSTNAMELEN]; 144char remotehost[MAXHOSTNAMELEN]; 145char dhostname[MAXHOSTNAMELEN]; 146char *guestpw; 147static char ttyline[20]; 148char *tty = ttyline; /* for klogin */ 149static struct utmp utmp; /* for utmp */ 150 151#if defined(KERBEROS) 152int notickets = 1; 153char *krbtkfile_env = NULL; 154#endif 155 156char *ident = NULL; 157 158 159/* 160 * Timeout intervals for retrying connections 161 * to hosts that don't accept PORT cmds. This 162 * is a kludge, but given the problems with TCP... 163 */ 164#define SWAITMAX 90 /* wait at most 90 seconds */ 165#define SWAITINT 5 /* interval between retries */ 166 167int swaitmax = SWAITMAX; 168int swaitint = SWAITINT; 169 170#ifdef HASSETPROCTITLE 171char proctitle[BUFSIZ]; /* initial part of title */ 172#endif /* HASSETPROCTITLE */ 173 174#define LOGCMD(cmd, file) \ 175 if (logging > 1) \ 176 syslog(LOG_INFO,"%s %s%s", cmd, \ 177 *(file) == '/' ? "" : curdir(), file); 178#define LOGCMD2(cmd, file1, file2) \ 179 if (logging > 1) \ 180 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 181 *(file1) == '/' ? "" : curdir(), file1, \ 182 *(file2) == '/' ? "" : curdir(), file2); 183#define LOGBYTES(cmd, file, cnt) \ 184 if (logging > 1) { \ 185 if (cnt == (off_t)-1) \ 186 syslog(LOG_INFO,"%s %s%s", cmd, \ 187 *(file) == '/' ? "" : curdir(), file); \ 188 else \ 189 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 190 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 191 } 192 193static void ack __P((char *)); 194static void myoob __P((int)); 195static int checkuser __P((char *, char *)); 196static FILE *dataconn __P((char *, off_t, char *)); 197static void dolog __P((struct sockaddr_in *)); 198static char *curdir __P((void)); 199static void end_login __P((void)); 200static FILE *getdatasock __P((char *)); 201static char *gunique __P((char *)); 202static void lostconn __P((int)); 203static void sigquit __P((int)); 204static int receive_data __P((FILE *, FILE *)); 205static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 206static struct passwd * 207 sgetpwnam __P((char *)); 208static char *sgetsave __P((char *)); 209static void reapchild __P((int)); 210 211void logxfer __P((char *, off_t, time_t)); 212 213static char * 214curdir() 215{ 216 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 217 218 if (getcwd(path, sizeof(path)-2) == NULL) 219 return (""); 220 if (path[1] != '\0') /* special case for root dir. */ 221 strcat(path, "/"); 222 /* For guest account, skip / since it's chrooted */ 223 return (guest ? path+1 : path); 224} 225 226int 227main(argc, argv, envp) 228 int argc; 229 char *argv[]; 230 char **envp; 231{ 232 int addrlen, ch, on = 1, tos; 233 char *cp, line[LINE_MAX]; 234 FILE *fd; 235 char *argstr = "dDhlMSt:T:u:Uv"; 236 struct hostent *hp; 237 238 tzset(); /* in case no timezone database in ~ftp */ 239 240 /* set this here so klogin can use it... */ 241 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 242 243 while ((ch = getopt(argc, argv, argstr)) != EOF) { 244 switch (ch) { 245 case 'd': 246 debug = 1; 247 break; 248 249 case 'D': 250 daemon_mode = 1; 251 break; 252 253 case 'h': 254 high_data_ports = 1; 255 break; 256 257 case 'l': 258 logging++; /* > 1 == extra logging */ 259 break; 260 261 case 'M': 262 multihome = 1; 263 break; 264 265 case 'S': 266 stats = 1; 267 break; 268 269 case 't': 270 timeout = atoi(optarg); 271 if (maxtimeout < timeout) 272 maxtimeout = timeout; 273 break; 274 275 case 'T': 276 maxtimeout = atoi(optarg); 277 if (timeout > maxtimeout) 278 timeout = maxtimeout; 279 break; 280 281 case 'u': 282 { 283 long val = 0; 284 285 val = strtol(optarg, &optarg, 8); 286 if (*optarg != '\0' || val < 0) 287 warnx("bad value for -u"); 288 else 289 defumask = val; 290 break; 291 } 292 293 case 'U': 294 doutmp = 1; 295 break; 296 297 case 'v': 298 debug = 1; 299 break; 300 301 default: 302 warnx("unknown flag -%c ignored", optopt); 303 break; 304 } 305 } 306 307 (void) freopen(_PATH_DEVNULL, "w", stderr); 308 309 /* 310 * LOG_NDELAY sets up the logging connection immediately, 311 * necessary for anonymous ftp's that chroot and can't do it later. 312 */ 313 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 314 315 if (daemon_mode) { 316 int ctl_sock, fd; 317 struct servent *sv; 318 319 /* 320 * Detach from parent. 321 */ 322 if (daemon(1, 1) < 0) { 323 syslog(LOG_ERR, "failed to become a daemon"); 324 exit(1); 325 } 326 (void) signal(SIGCHLD, reapchild); 327 /* 328 * Get port number for ftp/tcp. 329 */ 330 sv = getservbyname("ftp", "tcp"); 331 if (sv == NULL) { 332 syslog(LOG_ERR, "getservbyname for ftp failed"); 333 exit(1); 334 } 335 /* 336 * Open a socket, bind it to the FTP port, and start 337 * listening. 338 */ 339 ctl_sock = socket(AF_INET, SOCK_STREAM, 0); 340 if (ctl_sock < 0) { 341 syslog(LOG_ERR, "control socket: %m"); 342 exit(1); 343 } 344 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 345 (char *)&on, sizeof(on)) < 0) 346 syslog(LOG_ERR, "control setsockopt: %m");; 347 server_addr.sin_family = AF_INET; 348 server_addr.sin_addr.s_addr = INADDR_ANY; 349 server_addr.sin_port = sv->s_port; 350 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 351 sizeof(server_addr))) { 352 syslog(LOG_ERR, "control bind: %m"); 353 exit(1); 354 } 355 if (listen(ctl_sock, 32) < 0) { 356 syslog(LOG_ERR, "control listen: %m"); 357 exit(1); 358 } 359 /* 360 * Loop forever accepting connection requests and forking off 361 * children to handle them. 362 */ 363 while (1) { 364 addrlen = sizeof(his_addr); 365 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, 366 &addrlen); 367 if (fork() == 0) { 368 /* child */ 369 (void) dup2(fd, 0); 370 (void) dup2(fd, 1); 371 close(ctl_sock); 372 break; 373 } 374 close(fd); 375 } 376 } else { 377 addrlen = sizeof(his_addr); 378 if (getpeername(0, (struct sockaddr *)&his_addr, 379 &addrlen) < 0) { 380 syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); 381 exit(1); 382 } 383 } 384 385 (void) signal(SIGHUP, sigquit); 386 (void) signal(SIGINT, sigquit); 387 (void) signal(SIGQUIT, sigquit); 388 (void) signal(SIGTERM, sigquit); 389 (void) signal(SIGPIPE, lostconn); 390 (void) signal(SIGCHLD, SIG_IGN); 391 if ((long)signal(SIGURG, myoob) < 0) 392 syslog(LOG_ERR, "signal: %m"); 393 394 addrlen = sizeof(ctrl_addr); 395 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 396 syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); 397 exit(1); 398 } 399#ifdef IP_TOS 400 tos = IPTOS_LOWDELAY; 401 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 402 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 403#endif 404 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 405 406 /* Try to handle urgent data inline */ 407#ifdef SO_OOBINLINE 408 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 409 syslog(LOG_ERR, "setsockopt: %m"); 410#endif 411 412#ifdef F_SETOWN 413 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 414 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 415#endif 416 dolog(&his_addr); 417 /* 418 * Set up default state 419 */ 420 data = -1; 421 type = TYPE_A; 422 form = FORM_N; 423 stru = STRU_F; 424 mode = MODE_S; 425 tmpline[0] = '\0'; 426 427 /* If logins are disabled, print out the message. */ 428 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 429 while (fgets(line, sizeof(line), fd) != NULL) { 430 if ((cp = strchr(line, '\n')) != NULL) 431 *cp = '\0'; 432 lreply(530, "%s", line); 433 } 434 (void) fflush(stdout); 435 (void) fclose(fd); 436 reply(530, "System not available."); 437 exit(0); 438 } 439 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 440 while (fgets(line, sizeof(line), fd) != NULL) { 441 if ((cp = strchr(line, '\n')) != NULL) 442 *cp = '\0'; 443 lreply(220, "%s", line); 444 } 445 (void) fflush(stdout); 446 (void) fclose(fd); 447 /* reply(220,) must follow */ 448 } 449 (void) gethostname(hostname, sizeof(hostname)); 450 451 /* Make sure hostname is fully qualified. */ 452 hp = gethostbyname(hostname); 453 if (hp != NULL) 454 strcpy (hostname, hp->h_name); 455 456 if (multihome) { 457 hp = gethostbyaddr((char *) &ctrl_addr.sin_addr, 458 sizeof (struct in_addr), AF_INET); 459 if (hp != NULL) { 460 strcpy (dhostname, hp->h_name); 461 } else { 462 /* Default. */ 463 strcpy (dhostname, inet_ntoa(ctrl_addr.sin_addr)); 464 } 465 } 466 467 reply(220, "%s FTP server (%s) ready.", 468 (multihome ? dhostname : hostname), version); 469 (void) setjmp(errcatch); 470 for (;;) 471 (void) yyparse(); 472 /* NOTREACHED */ 473} 474 475/* 476 * Signal handlers. 477 */ 478 479static void 480lostconn(signo) 481 int signo; 482{ 483 484 if (debug) 485 syslog(LOG_DEBUG, "lost connection"); 486 dologout(-1); 487} 488 489static void 490sigquit(signo) 491 int signo; 492{ 493 syslog(LOG_ERR, "got signal %s", strsignal(signo)); 494 495 dologout(-1); 496} 497 498/* 499 * Helper function for sgetpwnam(). 500 */ 501static char * 502sgetsave(s) 503 char *s; 504{ 505 char *new = malloc((unsigned) strlen(s) + 1); 506 507 if (new == NULL) { 508 perror_reply(421, "Local resource failure: malloc"); 509 dologout(1); 510 /* NOTREACHED */ 511 } 512 (void) strcpy(new, s); 513 return (new); 514} 515 516/* 517 * Save the result of a getpwnam. Used for USER command, since 518 * the data returned must not be clobbered by any other command 519 * (e.g., globbing). 520 */ 521static struct passwd * 522sgetpwnam(name) 523 char *name; 524{ 525 static struct passwd save; 526 struct passwd *p; 527 528 if ((p = getpwnam(name)) == NULL) 529 return (p); 530 if (save.pw_name) { 531 free(save.pw_name); 532 free(save.pw_passwd); 533 free(save.pw_gecos); 534 free(save.pw_dir); 535 free(save.pw_shell); 536 } 537 save = *p; 538 save.pw_name = sgetsave(p->pw_name); 539 save.pw_passwd = sgetsave(p->pw_passwd); 540 save.pw_gecos = sgetsave(p->pw_gecos); 541 save.pw_dir = sgetsave(p->pw_dir); 542 save.pw_shell = sgetsave(p->pw_shell); 543 return (&save); 544} 545 546static int login_attempts; /* number of failed login attempts */ 547static int askpasswd; /* had user command, ask for passwd */ 548static char curname[16]; /* current USER name */ 549 550/* 551 * USER command. 552 * Sets global passwd pointer pw if named account exists and is acceptable; 553 * sets askpasswd if a PASS command is expected. If logged in previously, 554 * need to reset state. If name is "ftp" or "anonymous", the name is not in 555 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 556 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 557 * requesting login privileges. Disallow anyone who does not have a standard 558 * shell as returned by getusershell(). Disallow anyone mentioned in the file 559 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 560 */ 561void 562user(name) 563 char *name; 564{ 565 char *cp, *shell; 566 567 if (logged_in) { 568 if (guest) { 569 reply(530, "Can't change user from guest login."); 570 return; 571 } else if (dochroot) { 572 reply(530, "Can't change user from chroot user."); 573 return; 574 } 575 end_login(); 576 } 577 578 guest = 0; 579 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 580 if (checkuser(_PATH_FTPUSERS, "ftp") || 581 checkuser(_PATH_FTPUSERS, "anonymous")) 582 reply(530, "User %s access denied.", name); 583 else if ((pw = sgetpwnam("ftp")) != NULL) { 584 guest = 1; 585 askpasswd = 1; 586 reply(331, 587 "Guest login ok, type your name as password."); 588 } else 589 reply(530, "User %s unknown.", name); 590 if (!askpasswd && logging) 591 syslog(LOG_NOTICE, 592 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 593 return; 594 } 595 if (pw = sgetpwnam(name)) { 596 if ((shell = pw->pw_shell) == NULL || *shell == 0) 597 shell = _PATH_BSHELL; 598 while ((cp = getusershell()) != NULL) 599 if (strcmp(cp, shell) == 0) 600 break; 601 endusershell(); 602 603 if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { 604 reply(530, "User %s access denied.", name); 605 if (logging) 606 syslog(LOG_NOTICE, 607 "FTP LOGIN REFUSED FROM %s, %s", 608 remotehost, name); 609 pw = (struct passwd *) NULL; 610 return; 611 } 612 } 613 if (logging) { 614 strncpy(curname, name, sizeof(curname)-1); 615 curname[sizeof(curname)-1] = '\0'; 616 } 617#ifdef SKEY 618 if (!skey_haskey(name)) { 619 char *myskey, *skey_keyinfo __P((char *name)); 620 621 myskey = skey_keyinfo(name); 622 reply(331, "Password [ %s ] for %s required.", 623 myskey ? myskey : "error getting challenge", name); 624 } else 625#endif 626 reply(331, "Password required for %s.", name); 627 628 askpasswd = 1; 629 /* 630 * Delay before reading passwd after first failed 631 * attempt to slow down passwd-guessing programs. 632 */ 633 if (login_attempts) 634 sleep((unsigned) login_attempts); 635} 636 637/* 638 * Check if a user is in the file "fname" 639 */ 640static int 641checkuser(fname, name) 642 char *fname; 643 char *name; 644{ 645 FILE *fd; 646 int found = 0; 647 char *p, line[BUFSIZ]; 648 649 if ((fd = fopen(fname, "r")) != NULL) { 650 while (fgets(line, sizeof(line), fd) != NULL) 651 if ((p = strchr(line, '\n')) != NULL) { 652 *p = '\0'; 653 if (line[0] == '#') 654 continue; 655 if (strcmp(line, name) == 0) { 656 found = 1; 657 break; 658 } 659 } 660 (void) fclose(fd); 661 } 662 return (found); 663} 664 665/* 666 * Terminate login as previous user, if any, resetting state; 667 * used when USER command is given or login fails. 668 */ 669static void 670end_login() 671{ 672 673 (void) seteuid((uid_t)0); 674 if (logged_in) { 675 logwtmp(ttyline, "", ""); 676 if (doutmp) 677 logout(utmp.ut_line); 678 } 679 pw = NULL; 680 logged_in = 0; 681 guest = 0; 682 dochroot = 0; 683} 684 685void 686pass(passwd) 687 char *passwd; 688{ 689 int rval; 690 FILE *fd; 691 static char homedir[MAXPATHLEN]; 692 char rootdir[MAXPATHLEN]; 693 694 if (logged_in || askpasswd == 0) { 695 reply(503, "Login with USER first."); 696 return; 697 } 698 askpasswd = 0; 699 if (!guest) { /* "ftp" is only account allowed no password */ 700 if (pw == NULL) { 701 rval = 1; /* failure below */ 702 goto skip; 703 } 704#if defined(KERBEROS) 705 rval = klogin(pw, "", hostname, passwd); 706 if (rval == 0) 707 goto skip; 708#endif 709#ifdef SKEY 710 if (skey_haskey(pw->pw_name) == 0 && 711 (skey_passcheck(pw->pw_name, passwd) != -1)) { 712 rval = 0; 713 goto skip; 714 } 715#endif 716 /* the strcmp does not catch null passwords! */ 717 if (pw == NULL || *pw->pw_passwd == '\0' || 718 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 719 rval = 1; /* failure */ 720 goto skip; 721 } 722 rval = 0; 723 724skip: 725 /* 726 * If rval == 1, the user failed the authentication check 727 * above. If rval == 0, either Kerberos or local authentication 728 * succeeded. 729 */ 730 if (rval) { 731 reply(530, "Login incorrect."); 732 if (logging) 733 syslog(LOG_NOTICE, 734 "FTP LOGIN FAILED FROM %s, %s", 735 remotehost, curname); 736 pw = NULL; 737 if (login_attempts++ >= 5) { 738 syslog(LOG_NOTICE, 739 "repeated login failures from %s", 740 remotehost); 741 exit(0); 742 } 743 return; 744 } 745 } else { 746 /* Save anonymous' password. */ 747 guestpw = strdup(passwd); 748 if (guestpw == (char *)NULL) 749 fatal("Out of memory"); 750 } 751 login_attempts = 0; /* this time successful */ 752 if (setegid((gid_t)pw->pw_gid) < 0) { 753 reply(550, "Can't set gid."); 754 return; 755 } 756 (void) initgroups(pw->pw_name, pw->pw_gid); 757 758 /* open wtmp before chroot */ 759 logwtmp(ttyline, pw->pw_name, remotehost); 760 761 /* open utmp before chroot */ 762 if (doutmp) { 763 memset((void *)&utmp, 0, sizeof(utmp)); 764 (void)time(&utmp.ut_time); 765 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 766 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 767 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 768 login(&utmp); 769 } 770 771 /* open stats file before chroot */ 772 if (guest && (stats == 1) && (statfd < 0)) 773 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 774 stats = 0; 775 776 logged_in = 1; 777 778 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 779 if (guest || dochroot) { 780 if (multihome) { 781 struct stat ts; 782 783 /* Compute root directory. */ 784 snprintf (rootdir, sizeof(rootdir), "%s/%s", 785 pw->pw_dir, dhostname); 786 if (stat(rootdir, &ts) < 0) { 787 snprintf (rootdir, sizeof(rootdir), "%s/%s", 788 pw->pw_dir, hostname); 789 } 790 } else 791 strcpy (rootdir, pw->pw_dir); 792 } 793 if (guest) { 794 /* 795 * We MUST do a chdir() after the chroot. Otherwise 796 * the old current directory will be accessible as "." 797 * outside the new root! 798 */ 799 if (chroot(rootdir) < 0 || chdir("/") < 0) { 800 reply(550, "Can't set guest privileges."); 801 goto bad; 802 } 803 strcpy(pw->pw_dir, "/"); 804 setenv("HOME", "/", 1); 805 } else if (dochroot) { 806 if (chroot(rootdir) < 0 || chdir("/") < 0) { 807 reply(550, "Can't change root."); 808 goto bad; 809 } 810 strcpy(pw->pw_dir, "/"); 811 setenv("HOME", "/", 1); 812 } else if (chdir(pw->pw_dir) < 0) { 813 if (chdir("/") < 0) { 814 reply(530, "User %s: can't change directory to %s.", 815 pw->pw_name, pw->pw_dir); 816 goto bad; 817 } else 818 lreply(230, "No directory! Logging in with home=/"); 819 } 820 if (seteuid((uid_t)pw->pw_uid) < 0) { 821 reply(550, "Can't set uid."); 822 goto bad; 823 } 824 825 /* 826 * Set home directory so that use of ~ (tilde) works correctly. 827 */ 828 if (getcwd(homedir, MAXPATHLEN) != NULL) 829 setenv("HOME", homedir, 1); 830 831 /* 832 * Display a login message, if it exists. 833 * N.B. reply(230,) must follow the message. 834 */ 835 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 836 char *cp, line[LINE_MAX]; 837 838 while (fgets(line, sizeof(line), fd) != NULL) { 839 if ((cp = strchr(line, '\n')) != NULL) 840 *cp = '\0'; 841 lreply(230, "%s", line); 842 } 843 (void) fflush(stdout); 844 (void) fclose(fd); 845 } 846 if (guest) { 847 if (ident != NULL) 848 free(ident); 849 ident = strdup(passwd); 850 if (ident == (char *)NULL) 851 fatal("Ran out of memory."); 852 reply(230, "Guest login ok, access restrictions apply."); 853#ifdef HASSETPROCTITLE 854 snprintf(proctitle, sizeof(proctitle), 855 "%s: anonymous/%.*s", remotehost, 856 sizeof(proctitle) - sizeof(remotehost) - 857 sizeof(": anonymous/"), passwd); 858 setproctitle(proctitle); 859#endif /* HASSETPROCTITLE */ 860 if (logging) 861 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 862 remotehost, passwd); 863 } else { 864 reply(230, "User %s logged in.", pw->pw_name); 865#ifdef HASSETPROCTITLE 866 snprintf(proctitle, sizeof(proctitle), 867 "%s: %s", remotehost, pw->pw_name); 868 setproctitle(proctitle); 869#endif /* HASSETPROCTITLE */ 870 if (logging) 871 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 872 remotehost, pw->pw_name); 873 } 874 (void) umask(defumask); 875 return; 876bad: 877 /* Forget all about it... */ 878 end_login(); 879} 880 881void 882retrieve(cmd, name) 883 char *cmd, *name; 884{ 885 FILE *fin, *dout; 886 struct stat st; 887 int (*closefunc) __P((FILE *)); 888 time_t start; 889 890 if (cmd == 0) { 891 fin = fopen(name, "r"), closefunc = fclose; 892 st.st_size = 0; 893 } else { 894 char line[BUFSIZ]; 895 896 (void) snprintf(line, sizeof(line), cmd, name); 897 name = line; 898 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 899 st.st_size = -1; 900 st.st_blksize = BUFSIZ; 901 } 902 if (fin == NULL) { 903 if (errno != 0) { 904 perror_reply(550, name); 905 if (cmd == 0) { 906 LOGCMD("get", name); 907 } 908 } 909 return; 910 } 911 byte_count = -1; 912 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 913 reply(550, "%s: not a plain file.", name); 914 goto done; 915 } 916 if (restart_point) { 917 if (type == TYPE_A) { 918 off_t i, n; 919 int c; 920 921 n = restart_point; 922 i = 0; 923 while (i++ < n) { 924 if ((c=getc(fin)) == EOF) { 925 perror_reply(550, name); 926 goto done; 927 } 928 if (c == '\n') 929 i++; 930 } 931 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 932 perror_reply(550, name); 933 goto done; 934 } 935 } 936 dout = dataconn(name, st.st_size, "w"); 937 if (dout == NULL) 938 goto done; 939 time(&start); 940 send_data(fin, dout, st.st_blksize, st.st_size, 941 (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); 942 if ((cmd == 0) && stats) 943 logxfer(name, st.st_size, start); 944 (void) fclose(dout); 945 data = -1; 946 pdata = -1; 947done: 948 if (cmd == 0) 949 LOGBYTES("get", name, byte_count); 950 (*closefunc)(fin); 951} 952 953void 954store(name, mode, unique) 955 char *name, *mode; 956 int unique; 957{ 958 FILE *fout, *din; 959 struct stat st; 960 int (*closefunc) __P((FILE *)); 961 962 if (unique && stat(name, &st) == 0 && 963 (name = gunique(name)) == NULL) { 964 LOGCMD(*mode == 'w' ? "put" : "append", name); 965 return; 966 } 967 968 if (restart_point) 969 mode = "r+"; 970 fout = fopen(name, mode); 971 closefunc = fclose; 972 if (fout == NULL) { 973 perror_reply(553, name); 974 LOGCMD(*mode == 'w' ? "put" : "append", name); 975 return; 976 } 977 byte_count = -1; 978 if (restart_point) { 979 if (type == TYPE_A) { 980 off_t i, n; 981 int c; 982 983 n = restart_point; 984 i = 0; 985 while (i++ < n) { 986 if ((c=getc(fout)) == EOF) { 987 perror_reply(550, name); 988 goto done; 989 } 990 if (c == '\n') 991 i++; 992 } 993 /* 994 * We must do this seek to "current" position 995 * because we are changing from reading to 996 * writing. 997 */ 998 if (fseek(fout, 0L, L_INCR) < 0) { 999 perror_reply(550, name); 1000 goto done; 1001 } 1002 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1003 perror_reply(550, name); 1004 goto done; 1005 } 1006 } 1007 din = dataconn(name, (off_t)-1, "r"); 1008 if (din == NULL) 1009 goto done; 1010 if (receive_data(din, fout) == 0) { 1011 if (unique) 1012 reply(226, "Transfer complete (unique file name:%s).", 1013 name); 1014 else 1015 reply(226, "Transfer complete."); 1016 } 1017 (void) fclose(din); 1018 data = -1; 1019 pdata = -1; 1020done: 1021 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 1022 (*closefunc)(fout); 1023} 1024 1025static FILE * 1026getdatasock(mode) 1027 char *mode; 1028{ 1029 int on = 1, s, t, tries; 1030 1031 if (data >= 0) 1032 return (fdopen(data, mode)); 1033 (void) seteuid((uid_t)0); 1034 s = socket(AF_INET, SOCK_STREAM, 0); 1035 if (s < 0) 1036 goto bad; 1037 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1038 (char *) &on, sizeof(on)) < 0) 1039 goto bad; 1040 /* anchor socket to avoid multi-homing problems */ 1041 data_source.sin_len = sizeof(struct sockaddr_in); 1042 data_source.sin_family = AF_INET; 1043 data_source.sin_addr = ctrl_addr.sin_addr; 1044 for (tries = 1; ; tries++) { 1045 if (bind(s, (struct sockaddr *)&data_source, 1046 sizeof(data_source)) >= 0) 1047 break; 1048 if (errno != EADDRINUSE || tries > 10) 1049 goto bad; 1050 sleep(tries); 1051 } 1052 (void) seteuid((uid_t)pw->pw_uid); 1053#ifdef IP_TOS 1054 on = IPTOS_THROUGHPUT; 1055 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1056 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1057#endif 1058#ifdef TCP_NOPUSH 1059 /* 1060 * Turn off push flag to keep sender TCP from sending short packets 1061 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1062 * to set the send buffer size as well, but that may not be desirable 1063 * in heavy-load situations. 1064 */ 1065 on = 1; 1066 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 1067 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 1068#endif 1069#ifdef SO_SNDBUF 1070 on = 65536; 1071 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 1072 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 1073#endif 1074 1075 return (fdopen(s, mode)); 1076bad: 1077 /* Return the real value of errno (close may change it) */ 1078 t = errno; 1079 (void) seteuid((uid_t)pw->pw_uid); 1080 (void) close(s); 1081 errno = t; 1082 return (NULL); 1083} 1084 1085static FILE * 1086dataconn(name, size, mode) 1087 char *name; 1088 off_t size; 1089 char *mode; 1090{ 1091 char sizebuf[32]; 1092 FILE *file; 1093 int retry = 0, tos; 1094 1095 file_size = size; 1096 byte_count = 0; 1097 if (size != (off_t) -1) { 1098 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1099 size); 1100 } else 1101 sizebuf[0] = '\0'; 1102 if (pdata >= 0) { 1103 struct sockaddr_in from; 1104 int s, fromlen = sizeof(from); 1105 1106 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1107 if (s < 0) { 1108 reply(425, "Can't open data connection."); 1109 (void) close(pdata); 1110 pdata = -1; 1111 return (NULL); 1112 } 1113 if (ntohs(from.sin_port) < IPPORT_RESERVED) { 1114 perror_reply(425, "Can't build data connection"); 1115 (void) close(pdata); 1116 (void) close(s); 1117 pdata = -1; 1118 return (NULL); 1119 } 1120 if (from.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1121 perror_reply(435, "Can't build data connection"); 1122 (void) close(pdata); 1123 (void) close(s); 1124 pdata = -1; 1125 return (NULL); 1126 } 1127 (void) close(pdata); 1128 pdata = s; 1129#ifdef IP_TOS 1130 tos = IPTOS_THROUGHPUT; 1131 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1132 sizeof(int)); 1133#endif 1134 reply(150, "Opening %s mode data connection for '%s'%s.", 1135 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1136 return (fdopen(pdata, mode)); 1137 } 1138 if (data >= 0) { 1139 reply(125, "Using existing data connection for '%s'%s.", 1140 name, sizebuf); 1141 usedefault = 1; 1142 return (fdopen(data, mode)); 1143 } 1144 if (usedefault) 1145 data_dest = his_addr; 1146 usedefault = 1; 1147 file = getdatasock(mode); 1148 if (file == NULL) { 1149 reply(425, "Can't create data socket (%s,%d): %s.", 1150 inet_ntoa(data_source.sin_addr), 1151 ntohs(data_source.sin_port), strerror(errno)); 1152 return (NULL); 1153 } 1154 data = fileno(file); 1155 1156 /* 1157 * attempt to connect to reserved port on client machine; 1158 * this looks like an attack 1159 */ 1160 if (ntohs(data_dest.sin_port) < IPPORT_RESERVED) { 1161 perror_reply(425, "Can't build data connection"); 1162 (void) fclose(file); 1163 data = -1; 1164 return NULL; 1165 } 1166 if (data_dest.sin_addr.s_addr != his_addr.sin_addr.s_addr) { 1167 perror_reply(435, "Can't build data connection"); 1168 (void) fclose(file); 1169 data = -1; 1170 return NULL; 1171 } 1172 while (connect(data, (struct sockaddr *)&data_dest, 1173 sizeof(data_dest)) < 0) { 1174 if (errno == EADDRINUSE && retry < swaitmax) { 1175 sleep((unsigned) swaitint); 1176 retry += swaitint; 1177 continue; 1178 } 1179 perror_reply(425, "Can't build data connection"); 1180 (void) fclose(file); 1181 data = -1; 1182 return (NULL); 1183 } 1184 reply(150, "Opening %s mode data connection for '%s'%s.", 1185 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1186 return (file); 1187} 1188 1189/* 1190 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1191 * encapsulation of the data subject to Mode, Structure, and Type. 1192 * 1193 * NB: Form isn't handled. 1194 */ 1195static void 1196send_data(instr, outstr, blksize, filesize, isreg) 1197 FILE *instr, *outstr; 1198 off_t blksize; 1199 off_t filesize; 1200 int isreg; 1201{ 1202 int c, cnt, filefd, netfd; 1203 char *buf, *bp; 1204 size_t len; 1205 1206 transflag++; 1207 if (setjmp(urgcatch)) { 1208 transflag = 0; 1209 return; 1210 } 1211 switch (type) { 1212 1213 case TYPE_A: 1214 while ((c = getc(instr)) != EOF) { 1215 byte_count++; 1216 if (c == '\n') { 1217 if (ferror(outstr)) 1218 goto data_err; 1219 (void) putc('\r', outstr); 1220 } 1221 (void) putc(c, outstr); 1222 } 1223 fflush(outstr); 1224 transflag = 0; 1225 if (ferror(instr)) 1226 goto file_err; 1227 if (ferror(outstr)) 1228 goto data_err; 1229 reply(226, "Transfer complete."); 1230 return; 1231 1232 case TYPE_I: 1233 case TYPE_L: 1234 /* 1235 * isreg is only set if we are not doing restart and we 1236 * are sending a regular file 1237 */ 1238 netfd = fileno(outstr); 1239 filefd = fileno(instr); 1240 1241 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1242 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1243 (off_t)0); 1244 if (!buf) { 1245 syslog(LOG_WARNING, "mmap(%lu): %m", 1246 (unsigned long)filesize); 1247 goto oldway; 1248 } 1249 bp = buf; 1250 len = filesize; 1251 do { 1252 cnt = write(netfd, bp, len); 1253 len -= cnt; 1254 bp += cnt; 1255 if (cnt > 0) byte_count += cnt; 1256 } while(cnt > 0 && len > 0); 1257 1258 transflag = 0; 1259 munmap(buf, (size_t)filesize); 1260 if (cnt < 0) 1261 goto data_err; 1262 reply(226, "Transfer complete."); 1263 return; 1264 } 1265 1266oldway: 1267 if ((buf = malloc((u_int)blksize)) == NULL) { 1268 transflag = 0; 1269 perror_reply(451, "Local resource failure: malloc"); 1270 return; 1271 } 1272 1273 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1274 write(netfd, buf, cnt) == cnt) 1275 byte_count += cnt; 1276 transflag = 0; 1277 (void)free(buf); 1278 if (cnt != 0) { 1279 if (cnt < 0) 1280 goto file_err; 1281 goto data_err; 1282 } 1283 reply(226, "Transfer complete."); 1284 return; 1285 default: 1286 transflag = 0; 1287 reply(550, "Unimplemented TYPE %d in send_data", type); 1288 return; 1289 } 1290 1291data_err: 1292 transflag = 0; 1293 perror_reply(426, "Data connection"); 1294 return; 1295 1296file_err: 1297 transflag = 0; 1298 perror_reply(551, "Error on input file"); 1299} 1300 1301/* 1302 * Transfer data from peer to "outstr" using the appropriate encapulation of 1303 * the data subject to Mode, Structure, and Type. 1304 * 1305 * N.B.: Form isn't handled. 1306 */ 1307static int 1308receive_data(instr, outstr) 1309 FILE *instr, *outstr; 1310{ 1311 int c; 1312 int cnt, bare_lfs = 0; 1313 char buf[BUFSIZ]; 1314 1315 transflag++; 1316 if (setjmp(urgcatch)) { 1317 transflag = 0; 1318 return (-1); 1319 } 1320 switch (type) { 1321 1322 case TYPE_I: 1323 case TYPE_L: 1324 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1325 if (write(fileno(outstr), buf, cnt) != cnt) 1326 goto file_err; 1327 byte_count += cnt; 1328 } 1329 if (cnt < 0) 1330 goto data_err; 1331 transflag = 0; 1332 return (0); 1333 1334 case TYPE_E: 1335 reply(553, "TYPE E not implemented."); 1336 transflag = 0; 1337 return (-1); 1338 1339 case TYPE_A: 1340 while ((c = getc(instr)) != EOF) { 1341 byte_count++; 1342 if (c == '\n') 1343 bare_lfs++; 1344 while (c == '\r') { 1345 if (ferror(outstr)) 1346 goto data_err; 1347 if ((c = getc(instr)) != '\n') { 1348 (void) putc ('\r', outstr); 1349 if (c == '\0' || c == EOF) 1350 goto contin2; 1351 } 1352 } 1353 (void) putc(c, outstr); 1354 contin2: ; 1355 } 1356 fflush(outstr); 1357 if (ferror(instr)) 1358 goto data_err; 1359 if (ferror(outstr)) 1360 goto file_err; 1361 transflag = 0; 1362 if (bare_lfs) { 1363 lreply(226, 1364 "WARNING! %d bare linefeeds received in ASCII mode", 1365 bare_lfs); 1366 (void)printf(" File may not have transferred correctly.\r\n"); 1367 } 1368 return (0); 1369 default: 1370 reply(550, "Unimplemented TYPE %d in receive_data", type); 1371 transflag = 0; 1372 return (-1); 1373 } 1374 1375data_err: 1376 transflag = 0; 1377 perror_reply(426, "Data Connection"); 1378 return (-1); 1379 1380file_err: 1381 transflag = 0; 1382 perror_reply(452, "Error writing file"); 1383 return (-1); 1384} 1385 1386void 1387statfilecmd(filename) 1388 char *filename; 1389{ 1390 FILE *fin; 1391 int c; 1392 char line[LINE_MAX]; 1393 1394 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1395 fin = ftpd_popen(line, "r"); 1396 lreply(211, "status of %s:", filename); 1397 while ((c = getc(fin)) != EOF) { 1398 if (c == '\n') { 1399 if (ferror(stdout)){ 1400 perror_reply(421, "control connection"); 1401 (void) ftpd_pclose(fin); 1402 dologout(1); 1403 /* NOTREACHED */ 1404 } 1405 if (ferror(fin)) { 1406 perror_reply(551, filename); 1407 (void) ftpd_pclose(fin); 1408 return; 1409 } 1410 (void) putc('\r', stdout); 1411 } 1412 (void) putc(c, stdout); 1413 } 1414 (void) ftpd_pclose(fin); 1415 reply(211, "End of Status"); 1416} 1417 1418void 1419statcmd() 1420{ 1421 struct sockaddr_in *sin; 1422 u_char *a, *p; 1423 1424 lreply(211, "%s FTP server status:", hostname, version); 1425 printf(" %s\r\n", version); 1426 printf(" Connected to %s", remotehost); 1427 if (!isdigit(remotehost[0])) 1428 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1429 printf("\r\n"); 1430 if (logged_in) { 1431 if (guest) 1432 printf(" Logged in anonymously\r\n"); 1433 else 1434 printf(" Logged in as %s\r\n", pw->pw_name); 1435 } else if (askpasswd) 1436 printf(" Waiting for password\r\n"); 1437 else 1438 printf(" Waiting for user name\r\n"); 1439 printf(" TYPE: %s", typenames[type]); 1440 if (type == TYPE_A || type == TYPE_E) 1441 printf(", FORM: %s", formnames[form]); 1442 if (type == TYPE_L) 1443#if NBBY == 8 1444 printf(" %d", NBBY); 1445#else 1446 printf(" %d", bytesize); /* need definition! */ 1447#endif 1448 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1449 strunames[stru], modenames[mode]); 1450 if (data != -1) 1451 printf(" Data connection open\r\n"); 1452 else if (pdata != -1) { 1453 printf(" in Passive mode"); 1454 sin = &pasv_addr; 1455 goto printaddr; 1456 } else if (usedefault == 0) { 1457 printf(" PORT"); 1458 sin = &data_dest; 1459printaddr: 1460 a = (u_char *) &sin->sin_addr; 1461 p = (u_char *) &sin->sin_port; 1462#define UC(b) (((int) b) & 0xff) 1463 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1464 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1465#undef UC 1466 } else 1467 printf(" No data connection\r\n"); 1468 reply(211, "End of status"); 1469} 1470 1471void 1472fatal(s) 1473 char *s; 1474{ 1475 1476 reply(451, "Error in server: %s\n", s); 1477 reply(221, "Closing connection due to server error."); 1478 dologout(0); 1479 /* NOTREACHED */ 1480} 1481 1482void 1483#if __STDC__ 1484reply(int n, const char *fmt, ...) 1485#else 1486reply(n, fmt, va_alist) 1487 int n; 1488 char *fmt; 1489 va_dcl 1490#endif 1491{ 1492 va_list ap; 1493#if __STDC__ 1494 va_start(ap, fmt); 1495#else 1496 va_start(ap); 1497#endif 1498 (void)printf("%d ", n); 1499 (void)vprintf(fmt, ap); 1500 (void)printf("\r\n"); 1501 (void)fflush(stdout); 1502 if (debug) { 1503 syslog(LOG_DEBUG, "<--- %d ", n); 1504 vsyslog(LOG_DEBUG, fmt, ap); 1505 } 1506} 1507 1508void 1509#if __STDC__ 1510lreply(int n, const char *fmt, ...) 1511#else 1512lreply(n, fmt, va_alist) 1513 int n; 1514 char *fmt; 1515 va_dcl 1516#endif 1517{ 1518 va_list ap; 1519#if __STDC__ 1520 va_start(ap, fmt); 1521#else 1522 va_start(ap); 1523#endif 1524 (void)printf("%d- ", n); 1525 (void)vprintf(fmt, ap); 1526 (void)printf("\r\n"); 1527 (void)fflush(stdout); 1528 if (debug) { 1529 syslog(LOG_DEBUG, "<--- %d- ", n); 1530 vsyslog(LOG_DEBUG, fmt, ap); 1531 } 1532} 1533 1534static void 1535ack(s) 1536 char *s; 1537{ 1538 1539 reply(250, "%s command successful.", s); 1540} 1541 1542void 1543nack(s) 1544 char *s; 1545{ 1546 1547 reply(502, "%s command not implemented.", s); 1548} 1549 1550/* ARGSUSED */ 1551void 1552yyerror(s) 1553 char *s; 1554{ 1555 char *cp; 1556 1557 if (cp = strchr(cbuf,'\n')) 1558 *cp = '\0'; 1559 reply(500, "'%s': command not understood.", cbuf); 1560} 1561 1562void 1563delete(name) 1564 char *name; 1565{ 1566 struct stat st; 1567 1568 LOGCMD("delete", name); 1569 if (stat(name, &st) < 0) { 1570 perror_reply(550, name); 1571 return; 1572 } 1573 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1574 if (rmdir(name) < 0) { 1575 perror_reply(550, name); 1576 return; 1577 } 1578 goto done; 1579 } 1580 if (unlink(name) < 0) { 1581 perror_reply(550, name); 1582 return; 1583 } 1584done: 1585 ack("DELE"); 1586} 1587 1588void 1589cwd(path) 1590 char *path; 1591{ 1592 1593 if (chdir(path) < 0) 1594 perror_reply(550, path); 1595 else 1596 ack("CWD"); 1597} 1598 1599void 1600makedir(name) 1601 char *name; 1602{ 1603 1604 LOGCMD("mkdir", name); 1605 if (mkdir(name, 0777) < 0) 1606 perror_reply(550, name); 1607 else 1608 reply(257, "MKD command successful."); 1609} 1610 1611void 1612removedir(name) 1613 char *name; 1614{ 1615 1616 LOGCMD("rmdir", name); 1617 if (rmdir(name) < 0) 1618 perror_reply(550, name); 1619 else 1620 ack("RMD"); 1621} 1622 1623void 1624pwd() 1625{ 1626 char path[MAXPATHLEN + 1]; 1627 1628 if (getwd(path) == (char *)NULL) 1629 reply(550, "%s.", path); 1630 else 1631 reply(257, "\"%s\" is current directory.", path); 1632} 1633 1634char * 1635renamefrom(name) 1636 char *name; 1637{ 1638 struct stat st; 1639 1640 if (stat(name, &st) < 0) { 1641 perror_reply(550, name); 1642 return ((char *)0); 1643 } 1644 reply(350, "File exists, ready for destination name"); 1645 return (name); 1646} 1647 1648void 1649renamecmd(from, to) 1650 char *from, *to; 1651{ 1652 1653 LOGCMD2("rename", from, to); 1654 if (rename(from, to) < 0) 1655 perror_reply(550, "rename"); 1656 else 1657 ack("RNTO"); 1658} 1659 1660static void 1661dolog(sin) 1662 struct sockaddr_in *sin; 1663{ 1664 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1665 sizeof(struct in_addr), AF_INET); 1666 1667 if (hp) 1668 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)-1); 1669 else 1670 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1671 sizeof(remotehost)-1); 1672 remotehost[sizeof(remotehost)-1] = '\0'; 1673#ifdef HASSETPROCTITLE 1674 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1675 setproctitle(proctitle); 1676#endif /* HASSETPROCTITLE */ 1677 1678 if (logging) 1679 syslog(LOG_INFO, "connection from %s", remotehost); 1680} 1681 1682/* 1683 * Record logout in wtmp file 1684 * and exit with supplied status. 1685 */ 1686void 1687dologout(status) 1688 int status; 1689{ 1690 1691 if (logged_in) { 1692 (void) seteuid((uid_t)0); 1693 logwtmp(ttyline, "", ""); 1694 if (doutmp) 1695 logout(utmp.ut_line); 1696#if defined(KERBEROS) 1697 if (!notickets && krbtkfile_env) 1698 unlink(krbtkfile_env); 1699#endif 1700 } 1701 /* beware of flushing buffers after a SIGPIPE */ 1702 _exit(status); 1703} 1704 1705static void 1706myoob(signo) 1707 int signo; 1708{ 1709 char *cp; 1710 1711 /* only process if transfer occurring */ 1712 if (!transflag) 1713 return; 1714 cp = tmpline; 1715 if (getline(cp, 7, stdin) == NULL) { 1716 reply(221, "You could at least say goodbye."); 1717 dologout(0); 1718 } 1719 upper(cp); 1720 if (strcmp(cp, "ABOR\r\n") == 0) { 1721 tmpline[0] = '\0'; 1722 reply(426, "Transfer aborted. Data connection closed."); 1723 reply(226, "Abort successful"); 1724 longjmp(urgcatch, 1); 1725 } 1726 if (strcmp(cp, "STAT\r\n") == 0) { 1727 if (file_size != (off_t) -1) 1728 reply(213, "Status: %qd of %qd bytes transferred", 1729 byte_count, file_size); 1730 else 1731 reply(213, "Status: %qd bytes transferred", byte_count); 1732 } 1733} 1734 1735/* 1736 * Note: a response of 425 is not mentioned as a possible response to 1737 * the PASV command in RFC959. However, it has been blessed as 1738 * a legitimate response by Jon Postel in a telephone conversation 1739 * with Rick Adams on 25 Jan 89. 1740 */ 1741void 1742passive() 1743{ 1744 int len, on; 1745 u_short port; 1746 char *p, *a; 1747 1748 if (pw == NULL) { 1749 reply(530, "Please login with USER and PASS"); 1750 return; 1751 } 1752 pdata = socket(AF_INET, SOCK_STREAM, 0); 1753 if (pdata < 0) { 1754 perror_reply(425, "Can't open passive connection"); 1755 return; 1756 } 1757 1758#ifdef IP_PORTRANGE 1759 on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; 1760 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 1761 (char *)&on, sizeof(on)) < 0) 1762 goto pasv_error; 1763#endif 1764 1765 pasv_addr = ctrl_addr; 1766 pasv_addr.sin_port = 0; 1767 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1768 sizeof(pasv_addr)) < 0) 1769 goto pasv_error; 1770 1771 len = sizeof(pasv_addr); 1772 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1773 goto pasv_error; 1774 if (listen(pdata, 1) < 0) 1775 goto pasv_error; 1776 a = (char *) &pasv_addr.sin_addr; 1777 p = (char *) &pasv_addr.sin_port; 1778 1779#define UC(b) (((int) b) & 0xff) 1780 1781 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1782 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1783 return; 1784 1785pasv_error: 1786 (void) close(pdata); 1787 pdata = -1; 1788 perror_reply(425, "Can't open passive connection"); 1789 return; 1790} 1791 1792/* 1793 * Generate unique name for file with basename "local". 1794 * The file named "local" is already known to exist. 1795 * Generates failure reply on error. 1796 */ 1797static char * 1798gunique(local) 1799 char *local; 1800{ 1801 static char new[MAXPATHLEN]; 1802 struct stat st; 1803 int count, len; 1804 char *cp; 1805 1806 cp = strrchr(local, '/'); 1807 if (cp) 1808 *cp = '\0'; 1809 if (stat(cp ? local : ".", &st) < 0) { 1810 perror_reply(553, cp ? local : "."); 1811 return ((char *) 0); 1812 } 1813 if (cp) 1814 *cp = '/'; 1815 (void) strncpy(new, local, sizeof(new)-1); 1816 new[sizeof(new)-1] = '\0'; 1817 len = strlen(new); 1818 if (len+2+1 >= sizeof(new)-1) 1819 return (NULL); 1820 cp = new + len; 1821 *cp++ = '.'; 1822 for (count = 1; count < 100; count++) { 1823 (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); 1824 if (stat(new, &st) < 0) 1825 return (new); 1826 } 1827 reply(452, "Unique file name cannot be created."); 1828 return (NULL); 1829} 1830 1831/* 1832 * Format and send reply containing system error number. 1833 */ 1834void 1835perror_reply(code, string) 1836 int code; 1837 char *string; 1838{ 1839 1840 reply(code, "%s: %s.", string, strerror(errno)); 1841} 1842 1843static char *onefile[] = { 1844 "", 1845 0 1846}; 1847 1848void 1849send_file_list(whichf) 1850 char *whichf; 1851{ 1852 struct stat st; 1853 DIR *dirp = NULL; 1854 struct dirent *dir; 1855 FILE *dout = NULL; 1856 char **dirlist, *dirname; 1857 int simple = 0; 1858 int freeglob = 0; 1859 glob_t gl; 1860 1861 if (strpbrk(whichf, "~{[*?") != NULL) { 1862 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1863 1864 memset(&gl, 0, sizeof(gl)); 1865 freeglob = 1; 1866 if (glob(whichf, flags, 0, &gl)) { 1867 reply(550, "not found"); 1868 goto out; 1869 } else if (gl.gl_pathc == 0) { 1870 errno = ENOENT; 1871 perror_reply(550, whichf); 1872 goto out; 1873 } 1874 dirlist = gl.gl_pathv; 1875 } else { 1876 onefile[0] = whichf; 1877 dirlist = onefile; 1878 simple = 1; 1879 } 1880 1881 if (setjmp(urgcatch)) { 1882 transflag = 0; 1883 goto out; 1884 } 1885 while (dirname = *dirlist++) { 1886 if (stat(dirname, &st) < 0) { 1887 /* 1888 * If user typed "ls -l", etc, and the client 1889 * used NLST, do what the user meant. 1890 */ 1891 if (dirname[0] == '-' && *dirlist == NULL && 1892 transflag == 0) { 1893 retrieve("/bin/ls %s", dirname); 1894 goto out; 1895 } 1896 perror_reply(550, whichf); 1897 if (dout != NULL) { 1898 (void) fclose(dout); 1899 transflag = 0; 1900 data = -1; 1901 pdata = -1; 1902 } 1903 goto out; 1904 } 1905 1906 if (S_ISREG(st.st_mode)) { 1907 if (dout == NULL) { 1908 dout = dataconn("file list", (off_t)-1, "w"); 1909 if (dout == NULL) 1910 goto out; 1911 transflag++; 1912 } 1913 fprintf(dout, "%s%s\n", dirname, 1914 type == TYPE_A ? "\r" : ""); 1915 byte_count += strlen(dirname) + 1; 1916 continue; 1917 } else if (!S_ISDIR(st.st_mode)) 1918 continue; 1919 1920 if ((dirp = opendir(dirname)) == NULL) 1921 continue; 1922 1923 while ((dir = readdir(dirp)) != NULL) { 1924 char nbuf[MAXPATHLEN]; 1925 1926 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1927 continue; 1928 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1929 dir->d_namlen == 2) 1930 continue; 1931 1932 snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, 1933 dir->d_name); 1934 1935 /* 1936 * We have to do a stat to insure it's 1937 * not a directory or special file. 1938 */ 1939 if (simple || (stat(nbuf, &st) == 0 && 1940 S_ISREG(st.st_mode))) { 1941 if (dout == NULL) { 1942 dout = dataconn("file list", (off_t)-1, 1943 "w"); 1944 if (dout == NULL) 1945 goto out; 1946 transflag++; 1947 } 1948 if (nbuf[0] == '.' && nbuf[1] == '/') 1949 fprintf(dout, "%s%s\n", &nbuf[2], 1950 type == TYPE_A ? "\r" : ""); 1951 else 1952 fprintf(dout, "%s%s\n", nbuf, 1953 type == TYPE_A ? "\r" : ""); 1954 byte_count += strlen(nbuf) + 1; 1955 } 1956 } 1957 (void) closedir(dirp); 1958 } 1959 1960 if (dout == NULL) 1961 reply(550, "No files found."); 1962 else if (ferror(dout) != 0) 1963 perror_reply(550, "Data connection"); 1964 else 1965 reply(226, "Transfer complete."); 1966 1967 transflag = 0; 1968 if (dout != NULL) 1969 (void) fclose(dout); 1970 data = -1; 1971 pdata = -1; 1972out: 1973 if (freeglob) { 1974 freeglob = 0; 1975 globfree(&gl); 1976 } 1977} 1978 1979static void 1980reapchild(signo) 1981 int signo; 1982{ 1983 while (wait3(NULL, WNOHANG, NULL) > 0); 1984} 1985 1986void 1987logxfer(name, size, start) 1988 char *name; 1989 off_t size; 1990 time_t start; 1991{ 1992 char buf[2048]; 1993 char path[MAXPATHLEN]; 1994 char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; 1995 char *vname, *vpw; 1996 time_t now; 1997 1998 if ((statfd >= 0) && (getcwd(path, sizeof(path)) != NULL)) { 1999 time(&now); 2000 2001 vname = (char *)malloc(strlen(name)*4+1); 2002 if (vname == NULL) 2003 return; 2004 vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); 2005 if (vpw == NULL) { 2006 free(vname); 2007 return; 2008 } 2009 2010 strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); 2011 strvis(vpath, path, VIS_SAFE|VIS_NOSLASH); 2012 strvis(vname, name, VIS_SAFE|VIS_NOSLASH); 2013 strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); 2014 2015 snprintf(buf, sizeof(buf), 2016 "%.24s %d %s %qd %s/%s %c %s %c %c %s ftp %d %s %s\n", 2017 ctime(&now), now - start + (now == start), 2018 vremotehost, size, vpath, vname, 2019 ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 2020 'o', ((guest) ? 'a' : 'r'), 2021 vpw, 0 /* none yet */, 2022 ((guest) ? "*" : pw->pw_name), dhostname); 2023 write(statfd, buf, strlen(buf)); 2024 free(vname); 2025 free(vpw); 2026 } 2027} 2028