1 /* $NetBSD: ftpd.c,v 1.117 2000/11/30 08:33:33 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.117 2000/11/30 08:33:33 lukem Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdarg.h> 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <string.h> 151 #include <syslog.h> 152 #include <time.h> 153 #include <unistd.h> 154 #include <util.h> 155 #include <utmp.h> 156 #ifdef SKEY 157 #include <skey.h> 158 #endif 159 #ifdef KERBEROS5 160 #include <com_err.h> 161 #include <krb5/krb5.h> 162 #endif 163 164 #define GLOBAL 165 #include "extern.h" 166 #include "pathnames.h" 167 #include "version.h" 168 169 int data; 170 jmp_buf urgcatch; 171 struct passwd *pw; 172 int sflag; 173 int stru; /* avoid C keyword */ 174 int mode; 175 int dataport; /* use specific data port */ 176 int dopidfile; /* maintain pid file */ 177 int doutmp; /* update utmp file */ 178 int dowtmp; /* update wtmp file */ 179 int dropprivs; /* if privileges should or have been dropped */ 180 int mapped; /* IPv4 connection on AF_INET6 socket */ 181 off_t file_size; 182 off_t byte_count; 183 static char ttyline[20]; 184 static struct utmp utmp; /* for utmp */ 185 186 static const char *anondir = NULL; 187 static const char *confdir = _DEFAULT_CONFDIR; 188 189 #if defined(KERBEROS) || defined(KERBEROS5) 190 int has_ccache = 0; 191 int notickets = 1; 192 char *krbtkfile_env = NULL; 193 char *tty = ttyline; 194 int login_krb5_forwardable_tgt = 0; 195 #endif 196 197 int epsvall = 0; 198 199 /* 200 * Timeout intervals for retrying connections 201 * to hosts that don't accept PORT cmds. This 202 * is a kludge, but given the problems with TCP... 203 */ 204 #define SWAITMAX 90 /* wait at most 90 seconds */ 205 #define SWAITINT 5 /* interval between retries */ 206 207 int swaitmax = SWAITMAX; 208 int swaitint = SWAITINT; 209 210 static int bind_pasv_addr(void); 211 static int checkuser(const char *, const char *, int, int, char **); 212 static int checkaccess(const char *); 213 static int checkpassword(const struct passwd *, const char *); 214 static void dolog(struct sockinet *); 215 static void end_login(void); 216 static FILE *getdatasock(const char *); 217 static char *gunique(const char *); 218 static void lostconn(int); 219 static void myoob(int); 220 static int receive_data(FILE *, FILE *); 221 static int send_data(FILE *, FILE *, off_t, int); 222 static struct passwd *sgetpwnam(const char *); 223 224 int main(int, char *[]); 225 226 #if defined(KERBEROS) 227 int klogin(struct passwd *, char *, char *, char *); 228 void kdestroy(void); 229 #endif 230 #if defined(KERBEROS5) 231 int k5login(struct passwd *, char *, char *, char *); 232 void k5destroy(void); 233 #endif 234 235 int 236 main(int argc, char *argv[]) 237 { 238 int addrlen, ch, on = 1, tos, keepalive; 239 #ifdef KERBEROS5 240 krb5_error_code kerror; 241 #endif 242 char *p; 243 244 connections = 1; 245 debug = 0; 246 logging = 0; 247 pdata = -1; 248 sflag = 0; 249 dataport = 0; 250 dopidfile = 1; /* default: DO use a pid file to count users */ 251 doutmp = 0; /* default: don't log to utmp */ 252 dowtmp = 1; /* default: DO log to wtmp */ 253 dropprivs = 0; 254 mapped = 0; 255 usedefault = 1; 256 emailaddr = NULL; 257 hostname[0] = '\0'; 258 homedir[0] = '\0'; 259 gidcount = 0; 260 version = FTPD_VERSION; 261 262 /* 263 * LOG_NDELAY sets up the logging connection immediately, 264 * necessary for anonymous ftp's that chroot and can't do it later. 265 */ 266 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 267 268 while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wW")) 269 != -1) { 270 switch (ch) { 271 case 'a': 272 anondir = optarg; 273 break; 274 275 case 'c': 276 confdir = optarg; 277 break; 278 279 case 'C': 280 pw = sgetpwnam(optarg); 281 exit(checkaccess(optarg) ? 0 : 1); 282 /* NOTREACHED */ 283 284 case 'd': 285 case 'v': /* deprecated */ 286 debug = 1; 287 break; 288 289 case 'e': 290 emailaddr = optarg; 291 break; 292 293 case 'h': 294 strlcpy(hostname, optarg, sizeof(hostname)); 295 break; 296 297 case 'H': 298 if (gethostname(hostname, sizeof(hostname)) == -1) 299 hostname[0] = '\0'; 300 hostname[sizeof(hostname) - 1] = '\0'; 301 break; 302 303 case 'l': 304 logging++; /* > 1 == extra logging */ 305 break; 306 307 case 'P': 308 dataport = (int)strtol(optarg, &p, 10); 309 if (*p != '\0' || dataport < IPPORT_RESERVED || 310 dataport > IPPORT_ANONMAX) { 311 syslog(LOG_WARNING, "Invalid dataport %s", 312 optarg); 313 dataport = 0; 314 } 315 break; 316 317 case 'q': 318 dopidfile = 1; 319 break; 320 321 case 'Q': 322 dopidfile = 0; 323 break; 324 325 case 'r': 326 dropprivs = 1; 327 break; 328 329 case 's': 330 sflag = 1; 331 break; 332 333 case 't': 334 case 'T': 335 syslog(LOG_ERR, 336 "-%c has been deprecated in favour of ftpd.conf", 337 ch); 338 break; 339 340 case 'u': 341 doutmp = 1; 342 break; 343 344 case 'U': 345 doutmp = 0; 346 break; 347 348 case 'V': 349 if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0) 350 version = NULL; 351 else 352 version = xstrdup(optarg); 353 break; 354 355 case 'w': 356 dowtmp = 1; 357 break; 358 359 case 'W': 360 dowtmp = 0; 361 break; 362 363 default: 364 if (optopt == 'a' || optopt == 'C') 365 exit(1); 366 syslog(LOG_ERR, "unknown flag -%c ignored", optopt); 367 break; 368 } 369 } 370 if (EMPTYSTR(confdir)) 371 confdir = _DEFAULT_CONFDIR; 372 373 memset((char *)&his_addr, 0, sizeof (his_addr)); 374 addrlen = sizeof(his_addr.si_su); 375 if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) { 376 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 377 exit(1); 378 } 379 his_addr.su_len = addrlen; 380 memset((char *)&ctrl_addr, 0, sizeof (ctrl_addr)); 381 addrlen = sizeof(ctrl_addr.si_su); 382 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 383 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 384 exit(1); 385 } 386 ctrl_addr.su_len = addrlen; 387 #ifdef INET6 388 if (his_addr.su_family == AF_INET6 389 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) { 390 #if 1 391 /* 392 * IPv4 control connection arrived to AF_INET6 socket. 393 * I hate to do this, but this is the easiest solution. 394 * 395 * The assumption is untrue on SIIT environment. 396 */ 397 struct sockinet tmp_addr; 398 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 399 400 tmp_addr = his_addr; 401 memset(&his_addr, 0, sizeof(his_addr)); 402 his_addr.su_family = AF_INET; 403 his_addr.su_len = sizeof(his_addr.si_su.su_sin); 404 memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 405 sizeof(his_addr.su_addr)); 406 his_addr.su_port = tmp_addr.su_port; 407 408 tmp_addr = ctrl_addr; 409 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 410 ctrl_addr.su_family = AF_INET; 411 ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin); 412 memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off], 413 sizeof(ctrl_addr.su_addr)); 414 ctrl_addr.su_port = tmp_addr.su_port; 415 #else 416 while (fgets(line, sizeof(line), fd) != NULL) { 417 if ((cp = strchr(line, '\n')) != NULL) 418 *cp = '\0'; 419 reply(-530, "%s", line); 420 } 421 (void) fflush(stdout); 422 (void) fclose(fd); 423 reply(530, 424 "Connection from IPv4 mapped address is not supported."); 425 exit(0); 426 #endif 427 428 mapped = 1; 429 } else 430 #endif /* INET6 */ 431 mapped = 0; 432 #ifdef IP_TOS 433 if (!mapped && his_addr.su_family == AF_INET) { 434 tos = IPTOS_LOWDELAY; 435 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 436 sizeof(int)) < 0) 437 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 438 } 439 #endif 440 /* if the hostname hasn't been given, attempt to determine it */ 441 if (hostname[0] == '\0') { 442 if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su, 443 ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0) 444 != 0) 445 (void)gethostname(hostname, sizeof(hostname)); 446 hostname[sizeof(hostname) - 1] = '\0'; 447 } 448 449 /* set this here so klogin can use it... */ 450 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 451 452 (void) freopen(_PATH_DEVNULL, "w", stderr); 453 (void) signal(SIGPIPE, lostconn); 454 (void) signal(SIGCHLD, SIG_IGN); 455 if (signal(SIGURG, myoob) == SIG_ERR) 456 syslog(LOG_ERR, "signal: %m"); 457 458 /* Try to handle urgent data inline */ 459 #ifdef SO_OOBINLINE 460 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 461 syslog(LOG_ERR, "setsockopt: %m"); 462 #endif 463 /* Set keepalives on the socket to detect dropped connections. */ 464 #ifdef SO_KEEPALIVE 465 keepalive = 1; 466 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 467 sizeof(int)) < 0) 468 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 469 #endif 470 471 #ifdef F_SETOWN 472 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 473 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 474 #endif 475 dolog(&his_addr); 476 /* 477 * Set up default state 478 */ 479 data = -1; 480 type = TYPE_A; 481 form = FORM_N; 482 stru = STRU_F; 483 mode = MODE_S; 484 tmpline[0] = '\0'; 485 hasyyerrored = 0; 486 487 #ifdef KERBEROS5 488 kerror = krb5_init_context(&kcontext); 489 if (kerror) { 490 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 491 error_message(kerror)); 492 exit(0); 493 } 494 #endif /* KERBEROS5 */ 495 496 init_curclass(); 497 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 498 curclass.type = CLASS_REAL; 499 500 /* If logins are disabled, print out the message. */ 501 if (display_file(_PATH_NOLOGIN, 530)) { 502 reply(530, "System not available."); 503 exit(0); 504 } 505 (void)display_file(conffilename(_PATH_FTPWELCOME), 220); 506 /* reply(220,) must follow */ 507 if (EMPTYSTR(version)) 508 reply(220, "%s FTP server ready.", hostname); 509 else 510 reply(220, "%s FTP server (%s) ready.", hostname, version); 511 512 (void) setjmp(errcatch); 513 for (;;) 514 (void) yyparse(); 515 /* NOTREACHED */ 516 } 517 518 static void 519 lostconn(int signo) 520 { 521 522 if (debug) 523 syslog(LOG_DEBUG, "lost connection"); 524 dologout(1); 525 } 526 527 /* 528 * Save the result of a getpwnam. Used for USER command, since 529 * the data returned must not be clobbered by any other command 530 * (e.g., globbing). 531 */ 532 static struct passwd * 533 sgetpwnam(const char *name) 534 { 535 static struct passwd save; 536 struct passwd *p; 537 538 if ((p = getpwnam(name)) == NULL) 539 return (p); 540 if (save.pw_name) { 541 free((char *)save.pw_name); 542 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 543 free((char *)save.pw_passwd); 544 free((char *)save.pw_gecos); 545 free((char *)save.pw_dir); 546 free((char *)save.pw_shell); 547 } 548 save = *p; 549 save.pw_name = xstrdup(p->pw_name); 550 save.pw_passwd = xstrdup(p->pw_passwd); 551 save.pw_gecos = xstrdup(p->pw_gecos); 552 save.pw_dir = xstrdup(p->pw_dir); 553 save.pw_shell = xstrdup(p->pw_shell); 554 return (&save); 555 } 556 557 static int login_attempts; /* number of failed login attempts */ 558 static int askpasswd; /* had user command, ask for passwd */ 559 static char curname[10]; /* current USER name */ 560 561 /* 562 * USER command. 563 * Sets global passwd pointer pw if named account exists and is acceptable; 564 * sets askpasswd if a PASS command is expected. If logged in previously, 565 * need to reset state. If name is "ftp" or "anonymous", the name is not in 566 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 567 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 568 * requesting login privileges. Disallow anyone who does not have a standard 569 * shell as returned by getusershell(). Disallow anyone mentioned in the file 570 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 571 */ 572 void 573 user(const char *name) 574 { 575 if (logged_in) { 576 switch (curclass.type) { 577 case CLASS_GUEST: 578 reply(530, "Can't change user from guest login."); 579 return; 580 case CLASS_CHROOT: 581 reply(530, "Can't change user from chroot user."); 582 return; 583 case CLASS_REAL: 584 if (dropprivs) { 585 reply(530, "Can't change user."); 586 return; 587 } 588 end_login(); 589 break; 590 default: 591 abort(); 592 } 593 } 594 595 #if defined(KERBEROS) 596 kdestroy(); 597 #endif 598 #if defined(KERBEROS5) 599 k5destroy(); 600 #endif 601 602 curclass.type = CLASS_REAL; 603 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 604 /* need `pw' setup for checkaccess() and checkuser () */ 605 if ((pw = sgetpwnam("ftp")) == NULL) 606 reply(530, "User %s unknown.", name); 607 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 608 reply(530, "User %s access denied.", name); 609 else { 610 curclass.type = CLASS_GUEST; 611 askpasswd = 1; 612 reply(331, 613 "Guest login ok, type your name as password."); 614 } 615 if (!askpasswd && logging) 616 syslog(LOG_NOTICE, 617 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 618 return; 619 } 620 621 pw = sgetpwnam(name); 622 if (logging) 623 strlcpy(curname, name, sizeof(curname)); 624 625 #ifdef SKEY 626 if (skey_haskey(name) == 0) { 627 const char *myskey; 628 629 myskey = skey_keyinfo(name); 630 reply(331, "Password [%s] required for %s.", 631 myskey ? myskey : "error getting challenge", name); 632 } else 633 #endif 634 reply(331, "Password required for %s.", name); 635 636 askpasswd = 1; 637 /* 638 * Delay before reading passwd after first failed 639 * attempt to slow down passwd-guessing programs. 640 */ 641 if (login_attempts) 642 sleep((unsigned) login_attempts); 643 } 644 645 /* 646 * Determine whether something is to happen (allow access, chroot) 647 * for a user. Each line is a shell-style glob followed by 648 * `yes' or `no'. 649 * 650 * For backward compatability, `allow' and `deny' are synonymns 651 * for `yes' and `no', respectively. 652 * 653 * Each glob is matched against the username in turn, and the first 654 * match found is used. If no match is found, the result is the 655 * argument `def'. If a match is found but without and explicit 656 * `yes'/`no', the result is the opposite of def. 657 * 658 * If the file doesn't exist at all, the result is the argument 659 * `nofile' 660 * 661 * Any line starting with `#' is considered a comment and ignored. 662 * 663 * Returns 0 if the user is denied, or 1 if they are allowed. 664 * 665 * NOTE: needs struct passwd *pw setup before use. 666 */ 667 int 668 checkuser(const char *fname, const char *name, int def, int nofile, 669 char **retclass) 670 { 671 FILE *fd; 672 int retval; 673 char *glob, *perm, *class, *buf, *p; 674 size_t len, line; 675 676 retval = def; 677 if (retclass != NULL) 678 *retclass = NULL; 679 if ((fd = fopen(conffilename(fname), "r")) == NULL) 680 return nofile; 681 682 line = 0; 683 for (; 684 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 685 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 686 free(buf), buf = NULL) { 687 glob = perm = class = NULL; 688 p = buf; 689 if (len < 1) 690 continue; 691 if (p[len - 1] == '\n') 692 p[--len] = '\0'; 693 if (EMPTYSTR(p)) 694 continue; 695 696 NEXTWORD(p, glob); 697 NEXTWORD(p, perm); 698 NEXTWORD(p, class); 699 if (EMPTYSTR(glob)) 700 continue; 701 if (!EMPTYSTR(class)) { 702 if (strcasecmp(class, "all") == 0 || 703 strcasecmp(class, "none") == 0) { 704 syslog(LOG_WARNING, 705 "%s line %d: illegal user-defined class `%s' - skipping entry", 706 fname, (int)line, class); 707 continue; 708 } 709 } 710 711 /* have a host specifier */ 712 if ((p = strchr(glob, '@')) != NULL) { 713 unsigned long net, mask, addr; 714 int bits; 715 716 *p++ = '\0'; 717 /* check against network or CIDR */ 718 if (isdigit(*p) && 719 (bits = inet_net_pton(AF_INET, p, 720 &net, sizeof(net))) != -1) { 721 net = ntohl(net); 722 mask = 0xffffffffU << (32 - bits); 723 addr = ntohl(his_addr.su_addr.s_addr); 724 if ((addr & mask) != net) 725 continue; 726 727 /* check against hostname glob */ 728 } else if (fnmatch(p, remotehost, 0) != 0) 729 continue; 730 } 731 732 /* have a group specifier */ 733 if ((p = strchr(glob, ':')) != NULL) { 734 gid_t *groups, *ng; 735 int gsize, i, found; 736 737 *p++ = '\0'; 738 groups = NULL; 739 gsize = 16; 740 do { 741 ng = realloc(groups, gsize * sizeof(gid_t)); 742 if (ng == NULL) 743 fatal( 744 "Local resource failure: realloc"); 745 groups = ng; 746 } while (getgrouplist(pw->pw_name, pw->pw_gid, 747 groups, &gsize) == -1); 748 found = 0; 749 for (i = 0; i < gsize; i++) { 750 struct group *g; 751 752 if ((g = getgrgid(groups[i])) == NULL) 753 continue; 754 if (fnmatch(p, g->gr_name, 0) == 0) { 755 found = 1; 756 break; 757 } 758 } 759 free(groups); 760 if (!found) 761 continue; 762 } 763 764 /* check against username glob */ 765 if (fnmatch(glob, name, 0) != 0) 766 continue; 767 768 if (perm != NULL && 769 ((strcasecmp(perm, "allow") == 0) || 770 (strcasecmp(perm, "yes") == 0))) 771 retval = 1; 772 else if (perm != NULL && 773 ((strcasecmp(perm, "deny") == 0) || 774 (strcasecmp(perm, "no") == 0))) 775 retval = 0; 776 else 777 retval = !def; 778 if (!EMPTYSTR(class) && retclass != NULL) 779 *retclass = xstrdup(class); 780 free(buf); 781 break; 782 } 783 (void) fclose(fd); 784 return (retval); 785 } 786 787 /* 788 * Check if user is allowed by /etc/ftpusers 789 * returns 1 for yes, 0 for no 790 * 791 * NOTE: needs struct passwd *pw setup (for checkuser()) 792 */ 793 int 794 checkaccess(const char *name) 795 { 796 797 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 798 } 799 800 /* 801 * Terminate login as previous user, if any, resetting state; 802 * used when USER command is given or login fails. 803 */ 804 static void 805 end_login(void) 806 { 807 808 if (logged_in) { 809 if (dowtmp) 810 logwtmp(ttyline, "", ""); 811 if (doutmp) 812 logout(utmp.ut_line); 813 } 814 /* reset login state */ 815 (void) seteuid((uid_t)0); 816 pw = NULL; 817 logged_in = 0; 818 quietmessages = 0; 819 gidcount = 0; 820 curclass.type = CLASS_REAL; 821 } 822 823 void 824 pass(const char *passwd) 825 { 826 int rval; 827 const char *cp, *shell; 828 char *class, root[MAXPATHLEN]; 829 830 class = NULL; 831 if (logged_in || askpasswd == 0) { 832 reply(503, "Login with USER first."); 833 return; 834 } 835 askpasswd = 0; 836 if (curclass.type != CLASS_GUEST) { 837 /* "ftp" is the only account allowed with no password */ 838 if (pw == NULL) { 839 rval = 1; /* failure below */ 840 goto skip; 841 } 842 #if defined(KERBEROS) 843 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 844 rval = 0; 845 goto skip; 846 } 847 #endif 848 #if defined(KERBEROS5) 849 if (k5login(pw, "", hostname, (char *)passwd) == 0) { 850 rval = 0; 851 goto skip; 852 } 853 #endif 854 #ifdef SKEY 855 if (skey_haskey(pw->pw_name) == 0) { 856 char *p; 857 int r; 858 859 p = xstrdup(passwd); 860 r = skey_passcheck(pw->pw_name, p); 861 free(p); 862 if (r != -1) { 863 rval = 0; 864 goto skip; 865 } 866 } 867 #endif 868 if (!sflag) 869 rval = checkpassword(pw, passwd); 870 else 871 rval = 1; 872 873 skip: 874 875 /* 876 * If rval > 0, the user failed the authentication check 877 * above. If rval == 0, either Kerberos or local 878 * authentication succeeded. 879 */ 880 if (rval) { 881 reply(530, "%s", rval == 2 ? "Password expired." : 882 "Login incorrect."); 883 if (logging) { 884 syslog(LOG_NOTICE, 885 "FTP LOGIN FAILED FROM %s", remotehost); 886 syslog(LOG_AUTHPRIV | LOG_NOTICE, 887 "FTP LOGIN FAILED FROM %s, %s", 888 remotehost, curname); 889 } 890 pw = NULL; 891 if (login_attempts++ >= 5) { 892 syslog(LOG_NOTICE, 893 "repeated login failures from %s", 894 remotehost); 895 exit(0); 896 } 897 return; 898 } 899 } 900 901 /* password ok; see if anything else prevents login */ 902 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 903 reply(530, "User %s may not use FTP.", pw->pw_name); 904 if (logging) 905 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 906 remotehost, pw->pw_name); 907 goto bad; 908 } 909 /* if not guest user, check for valid shell */ 910 if ((shell = pw->pw_shell) == NULL || *shell == 0) 911 shell = _PATH_BSHELL; 912 while ((cp = getusershell()) != NULL) 913 if (strcmp(cp, shell) == 0) 914 break; 915 endusershell(); 916 if (cp == NULL && curclass.type != CLASS_GUEST) { 917 reply(530, "User %s may not use FTP.", pw->pw_name); 918 if (logging) 919 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 920 remotehost, pw->pw_name); 921 goto bad; 922 } 923 924 login_attempts = 0; /* this time successful */ 925 if (setegid((gid_t)pw->pw_gid) < 0) { 926 reply(550, "Can't set gid."); 927 goto bad; 928 } 929 (void) initgroups(pw->pw_name, pw->pw_gid); 930 /* cache groups for cmds.c::matchgroup() */ 931 gidcount = getgroups(sizeof(gidlist), gidlist); 932 933 /* open wtmp before chroot */ 934 if (dowtmp) 935 logwtmp(ttyline, pw->pw_name, remotehost); 936 937 /* open utmp before chroot */ 938 if (doutmp) { 939 memset((void *)&utmp, 0, sizeof(utmp)); 940 (void)time(&utmp.ut_time); 941 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 942 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 943 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 944 login(&utmp); 945 } 946 947 logged_in = 1; 948 949 /* check user in /etc/ftpchroot */ 950 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 951 if (curclass.type == CLASS_GUEST) { 952 syslog(LOG_NOTICE, 953 "Can't change guest user to chroot class; remove entry in %s", 954 _PATH_FTPCHROOT); 955 exit(1); 956 } 957 curclass.type = CLASS_CHROOT; 958 } 959 if (class == NULL) { 960 switch (curclass.type) { 961 case CLASS_GUEST: 962 class = xstrdup("guest"); 963 break; 964 case CLASS_CHROOT: 965 class = xstrdup("chroot"); 966 break; 967 case CLASS_REAL: 968 class = xstrdup("real"); 969 break; 970 default: 971 abort(); 972 } 973 } 974 975 /* parse ftpd.conf, setting up various parameters */ 976 parse_conf(class); 977 connections = 1; 978 if (dopidfile) 979 count_users(); 980 if (curclass.limit != -1 && connections > curclass.limit) { 981 if (! EMPTYSTR(curclass.limitfile)) 982 (void)display_file(conffilename(curclass.limitfile), 983 530); 984 reply(530, 985 "User %s access denied, connection limit of %d reached.", 986 pw->pw_name, curclass.limit); 987 syslog(LOG_NOTICE, 988 "Maximum connection limit of %d for class %s reached, login refused for %s", 989 curclass.limit, curclass.classname, pw->pw_name); 990 goto bad; 991 } 992 993 homedir[0] = '/'; 994 switch (curclass.type) { 995 case CLASS_GUEST: 996 /* 997 * We MUST do a chdir() after the chroot. Otherwise 998 * the old current directory will be accessible as "." 999 * outside the new root! 1000 */ 1001 format_path(root, 1002 curclass.chroot ? curclass.chroot : 1003 anondir ? anondir : 1004 pw->pw_dir); 1005 format_path(homedir, 1006 curclass.homedir ? curclass.homedir : 1007 "/"); 1008 if (EMPTYSTR(homedir)) 1009 homedir[0] = '/'; 1010 if (EMPTYSTR(root) || chroot(root) < 0) { 1011 syslog(LOG_NOTICE, 1012 "GUEST user %s: can't chroot to %s: %m", 1013 pw->pw_name, root); 1014 goto bad_guest; 1015 } 1016 if (chdir(homedir) < 0) { 1017 syslog(LOG_NOTICE, 1018 "GUEST user %s: can't chdir to %s: %m", 1019 pw->pw_name, homedir); 1020 bad_guest: 1021 reply(550, "Can't set guest privileges."); 1022 goto bad; 1023 } 1024 break; 1025 case CLASS_CHROOT: 1026 format_path(root, 1027 curclass.chroot ? curclass.chroot : 1028 pw->pw_dir); 1029 format_path(homedir, 1030 curclass.homedir ? curclass.homedir : 1031 "/"); 1032 if (EMPTYSTR(homedir)) 1033 homedir[0] = '/'; 1034 if (EMPTYSTR(root) || chroot(root) < 0) { 1035 syslog(LOG_NOTICE, 1036 "CHROOT user %s: can't chroot to %s: %m", 1037 pw->pw_name, root); 1038 goto bad_chroot; 1039 } 1040 if (chdir(homedir) < 0) { 1041 syslog(LOG_NOTICE, 1042 "CHROOT user %s: can't chdir to %s: %m", 1043 pw->pw_name, homedir); 1044 bad_chroot: 1045 reply(550, "Can't change root."); 1046 goto bad; 1047 } 1048 break; 1049 case CLASS_REAL: 1050 format_path(homedir, 1051 curclass.homedir ? curclass.homedir : 1052 pw->pw_dir); 1053 if (EMPTYSTR(homedir) || chdir(homedir) < 0) { 1054 if (chdir("/") < 0) { 1055 syslog(LOG_NOTICE, 1056 "REAL user %s: can't chdir to %s: %m", 1057 pw->pw_name, 1058 !EMPTYSTR(homedir) ? homedir : "/"); 1059 reply(530, 1060 "User %s: can't change directory to %s.", 1061 pw->pw_name, 1062 !EMPTYSTR(homedir) ? homedir : "/"); 1063 goto bad; 1064 } else { 1065 reply(-230, 1066 "No directory! Logging in with home=/"); 1067 homedir[0] = '/'; 1068 } 1069 } 1070 break; 1071 } 1072 setlogin(pw->pw_name); 1073 if (dropprivs || 1074 (curclass.type != CLASS_REAL && 1075 ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) { 1076 dropprivs++; 1077 if (setgid((gid_t)pw->pw_gid) < 0) { 1078 reply(550, "Can't set gid."); 1079 goto bad; 1080 } 1081 if (setuid((uid_t)pw->pw_uid) < 0) { 1082 reply(550, "Can't set uid."); 1083 goto bad; 1084 } 1085 } else { 1086 if (seteuid((uid_t)pw->pw_uid) < 0) { 1087 reply(550, "Can't set uid."); 1088 goto bad; 1089 } 1090 } 1091 setenv("HOME", homedir, 1); 1092 1093 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 1094 quietmessages = 1; 1095 1096 /* 1097 * Display a login message, if it exists. 1098 * N.B. reply(230,) must follow the message. 1099 */ 1100 (void)display_file(conffilename(curclass.motd), 230); 1101 show_chdir_messages(230); 1102 if (curclass.type == CLASS_GUEST) { 1103 reply(230, "Guest login ok, access restrictions apply."); 1104 #if HAVE_SETPROCTITLE 1105 snprintf(proctitle, sizeof(proctitle), 1106 "%s: anonymous/%.*s", remotehost, 1107 (int) (sizeof(proctitle) - sizeof(remotehost) - 1108 sizeof(": anonymous/")), passwd); 1109 setproctitle("%s", proctitle); 1110 #endif /* HAVE_SETPROCTITLE */ 1111 if (logging) 1112 syslog(LOG_INFO, 1113 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1114 remotehost, passwd, 1115 curclass.classname, CURCLASSTYPE); 1116 } else { 1117 reply(230, "User %s logged in.", pw->pw_name); 1118 #if HAVE_SETPROCTITLE 1119 snprintf(proctitle, sizeof(proctitle), 1120 "%s: %s", remotehost, pw->pw_name); 1121 setproctitle("%s", proctitle); 1122 #endif /* HAVE_SETPROCTITLE */ 1123 if (logging) 1124 syslog(LOG_INFO, 1125 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1126 remotehost, pw->pw_name, 1127 curclass.classname, CURCLASSTYPE); 1128 } 1129 (void) umask(curclass.umask); 1130 goto cleanuppass; 1131 1132 bad: 1133 /* Forget all about it... */ 1134 end_login(); 1135 1136 cleanuppass: 1137 if (class) 1138 free(class); 1139 } 1140 1141 void 1142 retrieve(char *argv[], const char *name) 1143 { 1144 FILE *fin, *dout; 1145 struct stat st; 1146 int (*closefunc)(FILE *) = NULL; 1147 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1148 struct timeval start, finish, td, *tdp; 1149 const char *dispname; 1150 1151 sendrv = closerv = stderrfd = -1; 1152 isconversion = isdata = isls = log = 0; 1153 tdp = NULL; 1154 dispname = name; 1155 fin = dout = NULL; 1156 if (argv == NULL) { 1157 log = 1; 1158 isdata = 1; 1159 fin = fopen(name, "r"); 1160 closefunc = fclose; 1161 if (fin == NULL) 1162 argv = do_conversion(name); 1163 if (argv != NULL) { 1164 isconversion++; 1165 syslog(LOG_INFO, "get command: '%s' on '%s'", 1166 argv[0], name); 1167 } 1168 } 1169 if (argv != NULL) { 1170 char temp[MAXPATHLEN]; 1171 1172 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1173 isls = 1; 1174 stderrfd = -1; 1175 } else { 1176 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1177 stderrfd = mkstemp(temp); 1178 if (stderrfd != -1) 1179 (void)unlink(temp); 1180 } 1181 dispname = argv[0]; 1182 fin = ftpd_popen(argv, "r", stderrfd); 1183 closefunc = ftpd_pclose; 1184 st.st_size = -1; 1185 st.st_blksize = BUFSIZ; 1186 } 1187 if (fin == NULL) { 1188 if (errno != 0) { 1189 perror_reply(550, dispname); 1190 if (log) 1191 logcmd("get", -1, name, NULL, NULL, 1192 strerror(errno)); 1193 } 1194 goto cleanupretrieve; 1195 } 1196 byte_count = -1; 1197 if (argv == NULL 1198 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1199 reply(550, "%s: not a plain file.", dispname); 1200 goto done; 1201 } 1202 if (restart_point) { 1203 if (type == TYPE_A) { 1204 off_t i; 1205 int c; 1206 1207 for (i = 0; i < restart_point; i++) { 1208 if ((c=getc(fin)) == EOF) { 1209 perror_reply(550, dispname); 1210 goto done; 1211 } 1212 if (c == '\n') 1213 i++; 1214 } 1215 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1216 perror_reply(550, dispname); 1217 goto done; 1218 } 1219 } 1220 dout = dataconn(dispname, st.st_size, "w"); 1221 if (dout == NULL) 1222 goto done; 1223 1224 (void)gettimeofday(&start, NULL); 1225 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1226 (void)gettimeofday(&finish, NULL); 1227 (void) fclose(dout); /* close now to affect timing stats */ 1228 dout = NULL; 1229 timersub(&finish, &start, &td); 1230 tdp = &td; 1231 done: 1232 if (log) 1233 logcmd("get", byte_count, name, NULL, tdp, NULL); 1234 closerv = (*closefunc)(fin); 1235 if (sendrv == 0) { 1236 FILE *err; 1237 struct stat sb; 1238 1239 if (!isls && argv != NULL && closerv != 0) { 1240 reply(-226, 1241 "Command returned an exit status of %d", 1242 closerv); 1243 if (isconversion) 1244 syslog(LOG_INFO, 1245 "retrieve command: '%s' returned %d", 1246 argv[0], closerv); 1247 } 1248 if (!isls && argv != NULL && stderrfd != -1 && 1249 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1250 ((err = fdopen(stderrfd, "r")) != NULL)) { 1251 char *cp, line[LINE_MAX]; 1252 1253 reply(-226, "Command error messages:"); 1254 rewind(err); 1255 while (fgets(line, sizeof(line), err) != NULL) { 1256 if ((cp = strchr(line, '\n')) != NULL) 1257 *cp = '\0'; 1258 reply(0, " %s", line); 1259 } 1260 (void) fflush(stdout); 1261 (void) fclose(err); 1262 /* a reply(226,) must follow */ 1263 } 1264 reply(226, "Transfer complete."); 1265 } 1266 cleanupretrieve: 1267 closedataconn(dout); 1268 if (stderrfd != -1) 1269 (void)close(stderrfd); 1270 if (isconversion) 1271 free(argv); 1272 } 1273 1274 void 1275 store(const char *name, const char *mode, int unique) 1276 { 1277 FILE *fout, *din; 1278 struct stat st; 1279 int (*closefunc)(FILE *); 1280 struct timeval start, finish, td, *tdp; 1281 char *desc; 1282 1283 din = NULL; 1284 desc = (*mode == 'w') ? "put" : "append"; 1285 if (unique && stat(name, &st) == 0 && 1286 (name = gunique(name)) == NULL) { 1287 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1288 goto cleanupstore; 1289 } 1290 1291 if (restart_point) 1292 mode = "r+"; 1293 fout = fopen(name, mode); 1294 closefunc = fclose; 1295 tdp = NULL; 1296 if (fout == NULL) { 1297 perror_reply(553, name); 1298 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1299 goto cleanupstore; 1300 } 1301 byte_count = -1; 1302 if (restart_point) { 1303 if (type == TYPE_A) { 1304 off_t i; 1305 int c; 1306 1307 for (i = 0; i < restart_point; i++) { 1308 if ((c=getc(fout)) == EOF) { 1309 perror_reply(550, name); 1310 goto done; 1311 } 1312 if (c == '\n') 1313 i++; 1314 } 1315 /* 1316 * We must do this seek to "current" position 1317 * because we are changing from reading to 1318 * writing. 1319 */ 1320 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1321 perror_reply(550, name); 1322 goto done; 1323 } 1324 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1325 perror_reply(550, name); 1326 goto done; 1327 } 1328 } 1329 din = dataconn(name, (off_t)-1, "r"); 1330 if (din == NULL) 1331 goto done; 1332 (void)gettimeofday(&start, NULL); 1333 if (receive_data(din, fout) == 0) { 1334 if (unique) 1335 reply(226, "Transfer complete (unique file name:%s).", 1336 name); 1337 else 1338 reply(226, "Transfer complete."); 1339 } 1340 (void)gettimeofday(&finish, NULL); 1341 (void) fclose(din); /* close now to affect timing stats */ 1342 din = NULL; 1343 timersub(&finish, &start, &td); 1344 tdp = &td; 1345 done: 1346 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1347 (*closefunc)(fout); 1348 cleanupstore: 1349 closedataconn(din); 1350 } 1351 1352 static FILE * 1353 getdatasock(const char *mode) 1354 { 1355 int on, s, t, tries; 1356 in_port_t port; 1357 1358 on = 1; 1359 if (data >= 0) 1360 return (fdopen(data, mode)); 1361 if (! dropprivs) 1362 (void) seteuid((uid_t)0); 1363 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1364 if (s < 0) 1365 goto bad; 1366 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1367 (char *) &on, sizeof(on)) < 0) 1368 goto bad; 1369 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1370 (char *) &on, sizeof(on)) < 0) 1371 goto bad; 1372 /* anchor socket to avoid multi-homing problems */ 1373 data_source = ctrl_addr; 1374 /* 1375 * By default source port for PORT connctions is 1376 * ctrlport-1 (see RFC959 section 5.2). 1377 * However, if privs have been dropped and that 1378 * would be < IPPORT_RESERVED, use a random port 1379 * instead. 1380 */ 1381 if (dataport) 1382 port = dataport; 1383 else 1384 port = ntohs(ctrl_addr.su_port) - 1; 1385 if (dropprivs && port < IPPORT_RESERVED) 1386 port = 0; /* use random port */ 1387 data_source.su_port = htons(port); 1388 1389 for (tries = 1; ; tries++) { 1390 if (bind(s, (struct sockaddr *)&data_source.si_su, 1391 data_source.su_len) >= 0) 1392 break; 1393 if (errno != EADDRINUSE || tries > 10) 1394 goto bad; 1395 sleep(tries); 1396 } 1397 if (! dropprivs) 1398 (void) seteuid((uid_t)pw->pw_uid); 1399 #ifdef IP_TOS 1400 if (!mapped && ctrl_addr.su_family == AF_INET) { 1401 on = IPTOS_THROUGHPUT; 1402 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1403 sizeof(int)) < 0) 1404 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1405 } 1406 #endif 1407 return (fdopen(s, mode)); 1408 bad: 1409 /* Return the real value of errno (close may change it) */ 1410 t = errno; 1411 if (! dropprivs) 1412 (void) seteuid((uid_t)pw->pw_uid); 1413 (void) close(s); 1414 errno = t; 1415 return (NULL); 1416 } 1417 1418 FILE * 1419 dataconn(const char *name, off_t size, const char *mode) 1420 { 1421 char sizebuf[32]; 1422 FILE *file; 1423 int retry = 0, tos, keepalive; 1424 1425 file_size = size; 1426 byte_count = 0; 1427 if (size != (off_t) -1) 1428 (void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)", 1429 (LLT)size, PLURAL(size)); 1430 else 1431 sizebuf[0] = '\0'; 1432 if (pdata >= 0) { 1433 struct sockinet from; 1434 int s, fromlen = sizeof(from.su_len); 1435 1436 (void) alarm(curclass.timeout); 1437 s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen); 1438 (void) alarm(0); 1439 if (s < 0) { 1440 reply(425, "Can't open data connection."); 1441 (void) close(pdata); 1442 pdata = -1; 1443 return (NULL); 1444 } 1445 (void) close(pdata); 1446 pdata = s; 1447 switch (from.su_family) { 1448 case AF_INET: 1449 #ifdef IP_TOS 1450 if (!mapped) { 1451 tos = IPTOS_THROUGHPUT; 1452 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1453 (char *)&tos, sizeof(int)); 1454 } 1455 break; 1456 #endif 1457 } 1458 /* Set keepalives on the socket to detect dropped conns. */ 1459 #ifdef SO_KEEPALIVE 1460 keepalive = 1; 1461 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1462 (char *)&keepalive, sizeof(int)); 1463 #endif 1464 reply(150, "Opening %s mode data connection for '%s'%s.", 1465 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1466 return (fdopen(pdata, mode)); 1467 } 1468 if (data >= 0) { 1469 reply(125, "Using existing data connection for '%s'%s.", 1470 name, sizebuf); 1471 usedefault = 1; 1472 return (fdopen(data, mode)); 1473 } 1474 if (usedefault) 1475 data_dest = his_addr; 1476 usedefault = 1; 1477 file = getdatasock(mode); 1478 if (file == NULL) { 1479 char hbuf[NI_MAXHOST]; 1480 char pbuf[NI_MAXSERV]; 1481 1482 if (getnameinfo((struct sockaddr *)&data_source.si_su, 1483 data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1484 NI_NUMERICHOST | NI_NUMERICSERV)) 1485 strlcpy(hbuf, "?", sizeof(hbuf)); 1486 reply(425, "Can't create data socket (%s,%s): %s.", 1487 hbuf, pbuf, strerror(errno)); 1488 return (NULL); 1489 } 1490 data = fileno(file); 1491 while (connect(data, (struct sockaddr *)&data_dest.si_su, 1492 data_dest.su_len) < 0) { 1493 if (errno == EADDRINUSE && retry < swaitmax) { 1494 sleep((unsigned) swaitint); 1495 retry += swaitint; 1496 continue; 1497 } 1498 perror_reply(425, "Can't build data connection"); 1499 (void) fclose(file); 1500 data = -1; 1501 return (NULL); 1502 } 1503 reply(150, "Opening %s mode data connection for '%s'%s.", 1504 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1505 return (file); 1506 } 1507 1508 void 1509 closedataconn(FILE *fd) 1510 { 1511 1512 if (fd != NULL) 1513 (void)fclose(fd); 1514 data = -1; 1515 if (pdata >= 0) 1516 (void)close(pdata); 1517 pdata = -1; 1518 } 1519 1520 /* 1521 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1522 * encapsulation of the data subject * to Mode, Structure, and Type. 1523 * 1524 * NB: Form isn't handled. 1525 */ 1526 static int 1527 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1528 { 1529 int c, filefd, netfd, rval; 1530 char *buf; 1531 1532 transflag = 1; 1533 rval = -1; 1534 buf = NULL; 1535 if (setjmp(urgcatch)) 1536 goto cleanup_send_data; 1537 1538 switch (type) { 1539 1540 case TYPE_A: 1541 /* XXXLUKEM: rate limit ascii send (get) */ 1542 (void) alarm(curclass.timeout); 1543 while ((c = getc(instr)) != EOF) { 1544 byte_count++; 1545 if (c == '\n') { 1546 if (ferror(outstr)) 1547 goto data_err; 1548 (void) putc('\r', outstr); 1549 if (isdata) { 1550 total_data_out++; 1551 total_data++; 1552 } 1553 total_bytes_out++; 1554 total_bytes++; 1555 } 1556 (void) putc(c, outstr); 1557 if (isdata) { 1558 total_data_out++; 1559 total_data++; 1560 } 1561 total_bytes_out++; 1562 total_bytes++; 1563 if ((byte_count % 4096) == 0) 1564 (void) alarm(curclass.timeout); 1565 } 1566 (void) alarm(0); 1567 fflush(outstr); 1568 if (ferror(instr)) 1569 goto file_err; 1570 if (ferror(outstr)) 1571 goto data_err; 1572 rval = 0; 1573 goto cleanup_send_data; 1574 1575 case TYPE_I: 1576 case TYPE_L: 1577 if ((buf = malloc((size_t)blksize)) == NULL) { 1578 perror_reply(451, "Local resource failure: malloc"); 1579 goto cleanup_send_data; 1580 } 1581 filefd = fileno(instr); 1582 netfd = fileno(outstr); 1583 (void) alarm(curclass.timeout); 1584 if (curclass.rateget) { 1585 while (1) { 1586 int d; 1587 struct timeval then, now, td; 1588 off_t bufrem; 1589 char *bufp; 1590 1591 (void)gettimeofday(&then, NULL); 1592 errno = c = d = 0; 1593 bufrem = curclass.rateget; 1594 while (bufrem > 0) { 1595 if ((c = read(filefd, buf, 1596 MIN(blksize, bufrem))) <= 0) 1597 goto senddone; 1598 (void) alarm(curclass.timeout); 1599 bufrem -= c; 1600 byte_count += c; 1601 if (isdata) { 1602 total_data_out += c; 1603 total_data += c; 1604 } 1605 total_bytes_out += c; 1606 total_bytes += c; 1607 for (bufp = buf; c > 0; 1608 c -= d, bufp += d) 1609 if ((d = 1610 write(netfd, bufp, c)) <= 0) 1611 break; 1612 if (d < 0) 1613 goto data_err; 1614 } 1615 (void)gettimeofday(&now, NULL); 1616 timersub(&now, &then, &td); 1617 if (td.tv_sec == 0) 1618 usleep(1000000 - td.tv_usec); 1619 } 1620 } else { 1621 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1622 if (write(netfd, buf, c) != c) 1623 goto data_err; 1624 (void) alarm(curclass.timeout); 1625 byte_count += c; 1626 if (isdata) { 1627 total_data_out += c; 1628 total_data += c; 1629 } 1630 total_bytes_out += c; 1631 total_bytes += c; 1632 } 1633 } 1634 senddone: 1635 if (c < 0) 1636 goto file_err; 1637 rval = 0; 1638 goto cleanup_send_data; 1639 1640 default: 1641 reply(550, "Unimplemented TYPE %d in send_data", type); 1642 goto cleanup_send_data; 1643 } 1644 1645 data_err: 1646 (void) alarm(0); 1647 perror_reply(426, "Data connection"); 1648 goto cleanup_send_data; 1649 1650 file_err: 1651 (void) alarm(0); 1652 perror_reply(551, "Error on input file"); 1653 /* FALLTHROUGH */ 1654 1655 cleanup_send_data: 1656 (void) alarm(0); 1657 transflag = 0; 1658 if (buf) 1659 free(buf); 1660 if (isdata) { 1661 total_files_out++; 1662 total_files++; 1663 } 1664 total_xfers_out++; 1665 total_xfers++; 1666 return (rval); 1667 } 1668 1669 /* 1670 * Transfer data from peer to "outstr" using the appropriate encapulation of 1671 * the data subject to Mode, Structure, and Type. 1672 * 1673 * N.B.: Form isn't handled. 1674 */ 1675 static int 1676 receive_data(FILE *instr, FILE *outstr) 1677 { 1678 int c, bare_lfs, netfd, filefd, rval; 1679 off_t byteswritten; 1680 char buf[BUFSIZ]; 1681 #ifdef __GNUC__ 1682 (void) &bare_lfs; 1683 #endif 1684 1685 bare_lfs = 0; 1686 transflag = 1; 1687 rval = -1; 1688 byteswritten = 0; 1689 if (setjmp(urgcatch)) 1690 goto cleanup_recv_data; 1691 1692 #define FILESIZECHECK(x) \ 1693 do { \ 1694 if (curclass.maxfilesize != -1 && \ 1695 (x) > curclass.maxfilesize) { \ 1696 errno = EFBIG; \ 1697 goto file_err; \ 1698 } \ 1699 } while (0) 1700 1701 switch (type) { 1702 1703 case TYPE_I: 1704 case TYPE_L: 1705 netfd = fileno(instr); 1706 filefd = fileno(outstr); 1707 (void) alarm(curclass.timeout); 1708 if (curclass.rateput) { 1709 while (1) { 1710 int d; 1711 struct timeval then, now, td; 1712 off_t bufrem; 1713 1714 (void)gettimeofday(&then, NULL); 1715 errno = c = d = 0; 1716 for (bufrem = curclass.rateput; bufrem > 0; ) { 1717 if ((c = read(netfd, buf, 1718 MIN(sizeof(buf), bufrem))) <= 0) 1719 goto recvdone; 1720 FILESIZECHECK(byte_count + c); 1721 if ((d = write(filefd, buf, c)) != c) 1722 goto file_err; 1723 (void) alarm(curclass.timeout); 1724 bufrem -= c; 1725 byte_count += c; 1726 total_data_in += c; 1727 total_data += c; 1728 total_bytes_in += c; 1729 total_bytes += c; 1730 } 1731 (void)gettimeofday(&now, NULL); 1732 timersub(&now, &then, &td); 1733 if (td.tv_sec == 0) 1734 usleep(1000000 - td.tv_usec); 1735 } 1736 } else { 1737 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1738 FILESIZECHECK(byte_count + c); 1739 if (write(filefd, buf, c) != c) 1740 goto file_err; 1741 (void) alarm(curclass.timeout); 1742 byte_count += c; 1743 total_data_in += c; 1744 total_data += c; 1745 total_bytes_in += c; 1746 total_bytes += c; 1747 } 1748 } 1749 recvdone: 1750 if (c < 0) 1751 goto data_err; 1752 rval = 0; 1753 goto cleanup_recv_data; 1754 1755 case TYPE_E: 1756 reply(553, "TYPE E not implemented."); 1757 goto cleanup_recv_data; 1758 1759 case TYPE_A: 1760 (void) alarm(curclass.timeout); 1761 /* XXXLUKEM: rate limit ascii receive (put) */ 1762 while ((c = getc(instr)) != EOF) { 1763 byte_count++; 1764 total_data_in++; 1765 total_data++; 1766 total_bytes_in++; 1767 total_bytes++; 1768 if ((byte_count % 4096) == 0) 1769 (void) alarm(curclass.timeout); 1770 if (c == '\n') 1771 bare_lfs++; 1772 while (c == '\r') { 1773 if (ferror(outstr)) 1774 goto data_err; 1775 if ((c = getc(instr)) != '\n') { 1776 byte_count++; 1777 total_data_in++; 1778 total_data++; 1779 total_bytes_in++; 1780 total_bytes++; 1781 if ((byte_count % 4096) == 0) 1782 (void) alarm(curclass.timeout); 1783 byteswritten++; 1784 FILESIZECHECK(byteswritten); 1785 (void) putc ('\r', outstr); 1786 if (c == '\0' || c == EOF) 1787 goto contin2; 1788 } 1789 } 1790 byteswritten++; 1791 FILESIZECHECK(byteswritten); 1792 (void) putc(c, outstr); 1793 contin2: ; 1794 } 1795 (void) alarm(0); 1796 fflush(outstr); 1797 if (ferror(instr)) 1798 goto data_err; 1799 if (ferror(outstr)) 1800 goto file_err; 1801 if (bare_lfs) { 1802 reply(-226, 1803 "WARNING! %d bare linefeeds received in ASCII mode", 1804 bare_lfs); 1805 reply(0, "File may not have transferred correctly."); 1806 } 1807 rval = 0; 1808 goto cleanup_recv_data; 1809 1810 default: 1811 reply(550, "Unimplemented TYPE %d in receive_data", type); 1812 goto cleanup_recv_data; 1813 } 1814 #undef FILESIZECHECK(x) 1815 1816 data_err: 1817 (void) alarm(0); 1818 perror_reply(426, "Data Connection"); 1819 goto cleanup_recv_data; 1820 1821 file_err: 1822 (void) alarm(0); 1823 perror_reply(452, "Error writing file"); 1824 goto cleanup_recv_data; 1825 1826 cleanup_recv_data: 1827 (void) alarm(0); 1828 transflag = 0; 1829 total_files_in++; 1830 total_files++; 1831 total_xfers_in++; 1832 total_xfers++; 1833 return (rval); 1834 } 1835 1836 void 1837 statcmd(void) 1838 { 1839 struct sockinet *su = NULL; 1840 static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 1841 u_char *a, *p; 1842 int ispassive, af; 1843 off_t otbi, otbo, otb; 1844 1845 a = p = (u_char *)NULL; 1846 1847 reply(-211, "%s FTP server status:", hostname); 1848 reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version); 1849 hbuf[0] = '\0'; 1850 if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len, 1851 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) 1852 && strcmp(remotehost, hbuf) != 0) 1853 reply(0, "Connected to %s (%s)", remotehost, hbuf); 1854 else 1855 reply(0, "Connected to %s", remotehost); 1856 1857 if (logged_in) { 1858 if (curclass.type == CLASS_GUEST) 1859 reply(0, "Logged in anonymously"); 1860 else 1861 reply(0, "Logged in as %s%s", pw->pw_name, 1862 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1863 } else if (askpasswd) 1864 reply(0, "Waiting for password"); 1865 else 1866 reply(0, "Waiting for user name"); 1867 cprintf(stdout, " TYPE: %s", typenames[type]); 1868 if (type == TYPE_A || type == TYPE_E) 1869 cprintf(stdout, ", FORM: %s", formnames[form]); 1870 if (type == TYPE_L) { 1871 #if NBBY == 8 1872 cprintf(stdout, " %d", NBBY); 1873 #else 1874 /* XXX: `bytesize' needs to be defined in this case */ 1875 cprintf(stdout, " %d", bytesize); 1876 #endif 1877 } 1878 cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n", 1879 strunames[stru], modenames[mode]); 1880 ispassive = 0; 1881 if (data != -1) { 1882 reply(0, "Data connection open"); 1883 su = NULL; 1884 } else if (pdata != -1) { 1885 reply(0, "in Passive mode"); 1886 su = (struct sockinet *)&pasv_addr; 1887 ispassive = 1; 1888 goto printaddr; 1889 } else if (usedefault == 0) { 1890 if (epsvall) { 1891 reply(0, "EPSV only mode (EPSV ALL)"); 1892 goto epsvonly; 1893 } 1894 su = (struct sockinet *)&data_dest; 1895 printaddr: 1896 /* PASV/PORT */ 1897 if (su->su_family == AF_INET) { 1898 a = (u_char *) &su->su_addr; 1899 p = (u_char *) &su->su_port; 1900 #define UC(b) (((int) b) & 0xff) 1901 reply(0, "%s (%d,%d,%d,%d,%d,%d)", 1902 ispassive ? "PASV" : "PORT" , 1903 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1904 UC(p[0]), UC(p[1])); 1905 } 1906 1907 /* LPSV/LPRT */ 1908 { 1909 int alen, af, i; 1910 1911 alen = 0; 1912 switch (su->su_family) { 1913 case AF_INET: 1914 a = (u_char *) &su->su_addr; 1915 p = (u_char *) &su->su_port; 1916 alen = sizeof(su->su_addr); 1917 af = 4; 1918 break; 1919 #ifdef INET6 1920 case AF_INET6: 1921 a = (u_char *) &su->su_6addr; 1922 p = (u_char *) &su->su_port; 1923 alen = sizeof(su->su_6addr); 1924 af = 6; 1925 break; 1926 #endif 1927 default: 1928 af = 0; 1929 break; 1930 } 1931 if (af) { 1932 cprintf(stdout, " %s (%d,%d", 1933 ispassive ? "LPSV" : "LPRT", af, alen); 1934 for (i = 0; i < alen; i++) 1935 cprintf(stdout, ",%d", UC(a[i])); 1936 cprintf(stdout, ",%d,%d,%d)\r\n", 1937 2, UC(p[0]), UC(p[1])); 1938 #undef UC 1939 } 1940 } 1941 1942 /* EPRT/EPSV */ 1943 epsvonly: 1944 af = af2epsvproto(su->su_family); 1945 hbuf[0] = '\0'; 1946 if (af > 0) { 1947 struct sockinet tmp; 1948 1949 tmp = *su; 1950 #ifdef INET6 1951 if (tmp.su_family == AF_INET6) 1952 tmp.su_scope_id = 0; 1953 #endif 1954 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1955 tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 1956 NI_NUMERICHOST | NI_NUMERICSERV) == 0) 1957 reply(0, "%s (|%d|%s|%s|)", 1958 ispassive ? "EPSV" : "EPRT", 1959 af, hbuf, sbuf); 1960 } 1961 } else 1962 reply(0, "No data connection"); 1963 1964 if (logged_in) { 1965 reply(0, 1966 "Data sent: " LLF " byte%s in " LLF " file%s", 1967 (LLT)total_data_out, PLURAL(total_data_out), 1968 (LLT)total_files_out, PLURAL(total_files_out)); 1969 reply(0, 1970 "Data received: " LLF " byte%s in " LLF " file%s", 1971 (LLT)total_data_in, PLURAL(total_data_in), 1972 (LLT)total_files_in, PLURAL(total_files_in)); 1973 reply(0, 1974 "Total data: " LLF " byte%s in " LLF " file%s", 1975 (LLT)total_data, PLURAL(total_data), 1976 (LLT)total_files, PLURAL(total_files)); 1977 } 1978 otbi = total_bytes_in; 1979 otbo = total_bytes_out; 1980 otb = total_bytes; 1981 reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s", 1982 (LLT)otbo, PLURAL(otbo), 1983 (LLT)total_xfers_out, PLURAL(total_xfers_out)); 1984 reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s", 1985 (LLT)otbi, PLURAL(otbi), 1986 (LLT)total_xfers_in, PLURAL(total_xfers_in)); 1987 reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s", 1988 (LLT)otb, PLURAL(otb), 1989 (LLT)total_xfers, PLURAL(total_xfers)); 1990 1991 if (logged_in) { 1992 struct ftpconv *cp; 1993 1994 reply(0, "%s", ""); 1995 reply(0, "Class: %s, type: %s", 1996 curclass.classname, CURCLASSTYPE); 1997 reply(0, "Check PORT/LPRT commands: %sabled", 1998 CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis"); 1999 if (! EMPTYSTR(curclass.display)) 2000 reply(0, "Display file: %s", curclass.display); 2001 if (! EMPTYSTR(curclass.notify)) 2002 reply(0, "Notify fileglob: %s", curclass.notify); 2003 reply(0, "Idle timeout: %d, maximum timeout: %d", 2004 curclass.timeout, curclass.maxtimeout); 2005 reply(0, "Current connections: %d", connections); 2006 if (curclass.limit == -1) 2007 reply(0, "Maximum connections: unlimited"); 2008 else 2009 reply(0, "Maximum connections: %d", curclass.limit); 2010 if (curclass.limitfile) 2011 reply(0, "Connection limit exceeded message file: %s", 2012 curclass.limitfile); 2013 if (! EMPTYSTR(curclass.chroot)) 2014 reply(0, "Chroot format: %s", curclass.chroot); 2015 if (! EMPTYSTR(curclass.homedir)) 2016 reply(0, "Homedir format: %s", curclass.homedir); 2017 if (curclass.maxfilesize == -1) 2018 reply(0, "Maximum file size: unlimited"); 2019 else 2020 reply(0, "Maximum file size: " LLF, 2021 (LLT)curclass.maxfilesize); 2022 if (! EMPTYSTR(curclass.motd)) 2023 reply(0, "MotD file: %s", curclass.motd); 2024 reply(0, 2025 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 2026 CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis"); 2027 reply(0, "Upload commands (APPE, STOR, STOU): %sabled", 2028 CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis"); 2029 reply(0, "Sanitize file names: %sabled", 2030 CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis"); 2031 reply(0, "PASV/LPSV/EPSV connections: %sabled", 2032 CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis"); 2033 if (curclass.portmin && curclass.portmax) 2034 reply(0, "PASV port range: %d - %d", 2035 curclass.portmin, curclass.portmax); 2036 if (curclass.rateget) 2037 reply(0, "Rate get limit: " LLF " bytes/sec", 2038 (LLT)curclass.rateget); 2039 else 2040 reply(0, "Rate get limit: disabled"); 2041 if (curclass.rateput) 2042 reply(0, "Rate put limit: " LLF " bytes/sec", 2043 (LLT)curclass.rateput); 2044 else 2045 reply(0, "Rate put limit: disabled"); 2046 reply(0, "Umask: %.04o", curclass.umask); 2047 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 2048 if (cp->suffix == NULL || cp->types == NULL || 2049 cp->command == NULL) 2050 continue; 2051 reply(0, "Conversion: %s [%s] disable: %s, command: %s", 2052 cp->suffix, cp->types, cp->disable, cp->command); 2053 } 2054 } 2055 2056 reply(211, "End of status"); 2057 } 2058 2059 void 2060 fatal(const char *s) 2061 { 2062 2063 reply(451, "Error in server: %s\n", s); 2064 reply(221, "Closing connection due to server error."); 2065 dologout(0); 2066 /* NOTREACHED */ 2067 } 2068 2069 /* 2070 * reply() -- 2071 * depending on the value of n, display fmt with a trailing CRLF and 2072 * prefix of: 2073 * n < -1 prefix the message with abs(n) + "-" (initial line) 2074 * n == 0 prefix the message with 4 spaces (middle lines) 2075 * n > 0 prefix the message with n + " " (final line) 2076 */ 2077 void 2078 reply(int n, const char *fmt, ...) 2079 { 2080 off_t b; 2081 va_list ap; 2082 2083 va_start(ap, fmt); 2084 b = 0; 2085 if (n == 0) 2086 cprintf(stdout, " "); 2087 else if (n < 0) 2088 cprintf(stdout, "%d-", -n); 2089 else 2090 cprintf(stdout, "%d ", n); 2091 b = vprintf(fmt, ap); 2092 total_bytes += b; 2093 total_bytes_out += b; 2094 cprintf(stdout, "\r\n"); 2095 (void)fflush(stdout); 2096 if (debug) { 2097 syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' '); 2098 vsyslog(LOG_DEBUG, fmt, ap); 2099 } 2100 } 2101 2102 static void 2103 dolog(struct sockinet *who) 2104 { 2105 2106 if (getnameinfo((struct sockaddr *)&who->si_su, 2107 who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0)) 2108 strlcpy(remotehost, "?", sizeof(remotehost)); 2109 2110 #if HAVE_SETPROCTITLE 2111 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2112 setproctitle("%s", proctitle); 2113 #endif /* HAVE_SETPROCTITLE */ 2114 if (logging) 2115 syslog(LOG_INFO, "connection from %s to %s", 2116 remotehost, hostname); 2117 } 2118 2119 /* 2120 * Record logout in wtmp file 2121 * and exit with supplied status. 2122 */ 2123 void 2124 dologout(int status) 2125 { 2126 /* 2127 * Prevent reception of SIGURG from resulting in a resumption 2128 * back to the main program loop. 2129 */ 2130 transflag = 0; 2131 2132 if (logged_in) { 2133 if (dowtmp) 2134 logwtmp(ttyline, "", ""); 2135 if (doutmp) 2136 logout(utmp.ut_line); 2137 #ifdef KERBEROS 2138 if (!notickets && krbtkfile_env) 2139 unlink(krbtkfile_env); 2140 #endif 2141 } 2142 /* beware of flushing buffers after a SIGPIPE */ 2143 _exit(status); 2144 } 2145 2146 static void 2147 myoob(int signo) 2148 { 2149 char *cp; 2150 2151 /* only process if transfer occurring */ 2152 if (!transflag) 2153 return; 2154 cp = tmpline; 2155 if (getline(cp, 7, stdin) == NULL) { 2156 reply(221, "You could at least say goodbye."); 2157 dologout(0); 2158 } 2159 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2160 tmpline[0] = '\0'; 2161 reply(426, "Transfer aborted. Data connection closed."); 2162 reply(226, "Abort successful"); 2163 longjmp(urgcatch, 1); 2164 } 2165 if (strcasecmp(cp, "STAT\r\n") == 0) { 2166 tmpline[0] = '\0'; 2167 if (file_size != (off_t) -1) 2168 reply(213, 2169 "Status: " LLF " of " LLF " byte%s transferred", 2170 (LLT)byte_count, (LLT)file_size, 2171 PLURAL(byte_count)); 2172 else 2173 reply(213, "Status: " LLF " byte%s transferred", 2174 (LLT)byte_count, PLURAL(byte_count)); 2175 } 2176 } 2177 2178 static int 2179 bind_pasv_addr(void) 2180 { 2181 static int passiveport; 2182 int port, len; 2183 2184 len = pasv_addr.su_len; 2185 if (curclass.portmin == 0 && curclass.portmax == 0) { 2186 pasv_addr.su_port = 0; 2187 return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len)); 2188 } 2189 2190 if (passiveport == 0) { 2191 srand(getpid()); 2192 passiveport = rand() % (curclass.portmax - curclass.portmin) 2193 + curclass.portmin; 2194 } 2195 2196 port = passiveport; 2197 while (1) { 2198 port++; 2199 if (port > curclass.portmax) 2200 port = curclass.portmin; 2201 else if (port == passiveport) { 2202 errno = EAGAIN; 2203 return (-1); 2204 } 2205 pasv_addr.su_port = htons(port); 2206 if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0) 2207 break; 2208 if (errno != EADDRINUSE) 2209 return (-1); 2210 } 2211 passiveport = port; 2212 return (0); 2213 } 2214 2215 /* 2216 * Note: a response of 425 is not mentioned as a possible response to 2217 * the PASV command in RFC959. However, it has been blessed as 2218 * a legitimate response by Jon Postel in a telephone conversation 2219 * with Rick Adams on 25 Jan 89. 2220 */ 2221 void 2222 passive(void) 2223 { 2224 int len; 2225 char *p, *a; 2226 2227 if (pdata >= 0) 2228 close(pdata); 2229 pdata = socket(AF_INET, SOCK_STREAM, 0); 2230 if (pdata < 0 || !logged_in) { 2231 perror_reply(425, "Can't open passive connection"); 2232 return; 2233 } 2234 pasv_addr = ctrl_addr; 2235 2236 if (bind_pasv_addr() < 0) 2237 goto pasv_error; 2238 len = pasv_addr.su_len; 2239 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2240 goto pasv_error; 2241 pasv_addr.su_len = len; 2242 if (listen(pdata, 1) < 0) 2243 goto pasv_error; 2244 a = (char *) &pasv_addr.su_addr; 2245 p = (char *) &pasv_addr.su_port; 2246 2247 #define UC(b) (((int) b) & 0xff) 2248 2249 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2250 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2251 return; 2252 2253 pasv_error: 2254 (void) close(pdata); 2255 pdata = -1; 2256 perror_reply(425, "Can't open passive connection"); 2257 return; 2258 } 2259 2260 /* 2261 * convert protocol identifier to/from AF 2262 */ 2263 int 2264 lpsvproto2af(int proto) 2265 { 2266 2267 switch (proto) { 2268 case 4: 2269 return AF_INET; 2270 #ifdef INET6 2271 case 6: 2272 return AF_INET6; 2273 #endif 2274 default: 2275 return -1; 2276 } 2277 } 2278 2279 int 2280 af2lpsvproto(int af) 2281 { 2282 2283 switch (af) { 2284 case AF_INET: 2285 return 4; 2286 #ifdef INET6 2287 case AF_INET6: 2288 return 6; 2289 #endif 2290 default: 2291 return -1; 2292 } 2293 } 2294 2295 int 2296 epsvproto2af(int proto) 2297 { 2298 2299 switch (proto) { 2300 case 1: 2301 return AF_INET; 2302 #ifdef INET6 2303 case 2: 2304 return AF_INET6; 2305 #endif 2306 default: 2307 return -1; 2308 } 2309 } 2310 2311 int 2312 af2epsvproto(int af) 2313 { 2314 2315 switch (af) { 2316 case AF_INET: 2317 return 1; 2318 #ifdef INET6 2319 case AF_INET6: 2320 return 2; 2321 #endif 2322 default: 2323 return -1; 2324 } 2325 } 2326 2327 /* 2328 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2329 * 229 Entering Extended Passive Mode (|||port|) 2330 */ 2331 void 2332 long_passive(char *cmd, int pf) 2333 { 2334 int len; 2335 char *p, *a; 2336 2337 if (!logged_in) { 2338 syslog(LOG_NOTICE, "long passive but not logged in"); 2339 reply(503, "Login with USER first."); 2340 return; 2341 } 2342 2343 if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) { 2344 /* 2345 * XXX: only EPRT/EPSV ready clients will understand this 2346 */ 2347 if (strcmp(cmd, "EPSV") != 0) 2348 reply(501, "Network protocol mismatch"); /*XXX*/ 2349 else 2350 epsv_protounsupp("Network protocol mismatch"); 2351 2352 return; 2353 } 2354 2355 if (pdata >= 0) 2356 close(pdata); 2357 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2358 if (pdata < 0) { 2359 perror_reply(425, "Can't open passive connection"); 2360 return; 2361 } 2362 pasv_addr = ctrl_addr; 2363 if (bind_pasv_addr() < 0) 2364 goto pasv_error; 2365 len = pasv_addr.su_len; 2366 if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0) 2367 goto pasv_error; 2368 pasv_addr.su_len = len; 2369 if (listen(pdata, 1) < 0) 2370 goto pasv_error; 2371 p = (char *) &pasv_addr.su_port; 2372 2373 #define UC(b) (((int) b) & 0xff) 2374 2375 if (strcmp(cmd, "LPSV") == 0) { 2376 switch (pasv_addr.su_family) { 2377 case AF_INET: 2378 a = (char *) &pasv_addr.su_addr; 2379 reply(228, 2380 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2381 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2382 2, UC(p[0]), UC(p[1])); 2383 return; 2384 #ifdef INET6 2385 case AF_INET6: 2386 a = (char *) &pasv_addr.su_6addr; 2387 reply(228, 2388 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2389 6, 16, 2390 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2391 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2392 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2393 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2394 2, UC(p[0]), UC(p[1])); 2395 return; 2396 #endif 2397 } 2398 #undef UC 2399 } else if (strcmp(cmd, "EPSV") == 0) { 2400 switch (pasv_addr.su_family) { 2401 case AF_INET: 2402 #ifdef INET6 2403 case AF_INET6: 2404 #endif 2405 reply(229, "Entering Extended Passive Mode (|||%d|)", 2406 ntohs(pasv_addr.su_port)); 2407 return; 2408 } 2409 } else { 2410 /* more proper error code? */ 2411 } 2412 2413 pasv_error: 2414 (void) close(pdata); 2415 pdata = -1; 2416 perror_reply(425, "Can't open passive connection"); 2417 return; 2418 } 2419 2420 int 2421 extended_port(const char *arg) 2422 { 2423 char *tmp = NULL; 2424 char *result[3]; 2425 char *p, *q; 2426 char delim; 2427 struct addrinfo hints; 2428 struct addrinfo *res = NULL; 2429 int i; 2430 unsigned long proto; 2431 2432 tmp = xstrdup(arg); 2433 p = tmp; 2434 delim = p[0]; 2435 p++; 2436 memset(result, 0, sizeof(result)); 2437 for (i = 0; i < 3; i++) { 2438 q = strchr(p, delim); 2439 if (!q || *q != delim) 2440 goto parsefail; 2441 *q++ = '\0'; 2442 result[i] = p; 2443 p = q; 2444 } 2445 2446 /* some more sanity checks */ 2447 p = NULL; 2448 (void)strtoul(result[2], &p, 10); 2449 if (!*result[2] || *p) 2450 goto parsefail; 2451 p = NULL; 2452 proto = strtoul(result[0], &p, 10); 2453 if (!*result[0] || *p) 2454 goto protounsupp; 2455 2456 memset(&hints, 0, sizeof(hints)); 2457 hints.ai_family = epsvproto2af((int)proto); 2458 if (hints.ai_family < 0) 2459 goto protounsupp; 2460 hints.ai_socktype = SOCK_STREAM; 2461 hints.ai_flags = AI_NUMERICHOST; 2462 if (getaddrinfo(result[1], result[2], &hints, &res)) 2463 goto parsefail; 2464 if (res->ai_next) 2465 goto parsefail; 2466 if (sizeof(data_dest) < res->ai_addrlen) 2467 goto parsefail; 2468 memcpy(&data_dest, res->ai_addr, res->ai_addrlen); 2469 #ifdef INET6 2470 if (his_addr.su_family == AF_INET6 && 2471 data_dest.su_family == AF_INET6) { 2472 /* XXX: more sanity checks! */ 2473 data_dest.su_scope_id = his_addr.su_scope_id; 2474 } 2475 #endif 2476 2477 if (tmp != NULL) 2478 free(tmp); 2479 if (res) 2480 freeaddrinfo(res); 2481 return 0; 2482 2483 parsefail: 2484 reply(500, "Invalid argument, rejected."); 2485 usedefault = 1; 2486 if (tmp != NULL) 2487 free(tmp); 2488 if (res) 2489 freeaddrinfo(res); 2490 return -1; 2491 2492 protounsupp: 2493 epsv_protounsupp("Protocol not supported"); 2494 usedefault = 1; 2495 if (tmp != NULL) 2496 free(tmp); 2497 if (res) 2498 freeaddrinfo(res); 2499 return -1; 2500 } 2501 2502 /* 2503 * 522 Protocol not supported (proto,...) 2504 * as we assume address family for control and data connections are the same, 2505 * we do not return the list of address families we support - instead, we 2506 * return the address family of the control connection. 2507 */ 2508 void 2509 epsv_protounsupp(const char *message) 2510 { 2511 int proto; 2512 2513 proto = af2epsvproto(ctrl_addr.su_family); 2514 if (proto < 0) 2515 reply(501, "%s", message); /* XXX */ 2516 else 2517 reply(522, "%s, use (%d)", message, proto); 2518 } 2519 2520 /* 2521 * Generate unique name for file with basename "local". 2522 * The file named "local" is already known to exist. 2523 * Generates failure reply on error. 2524 * 2525 * XXX: this function should under go changes similar to 2526 * the mktemp(3)/mkstemp(3) changes. 2527 */ 2528 static char * 2529 gunique(const char *local) 2530 { 2531 static char new[MAXPATHLEN]; 2532 struct stat st; 2533 char *cp; 2534 int count; 2535 2536 cp = strrchr(local, '/'); 2537 if (cp) 2538 *cp = '\0'; 2539 if (stat(cp ? local : ".", &st) < 0) { 2540 perror_reply(553, cp ? local : "."); 2541 return (NULL); 2542 } 2543 if (cp) 2544 *cp = '/'; 2545 for (count = 1; count < 100; count++) { 2546 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2547 if (stat(new, &st) < 0) 2548 return (new); 2549 } 2550 reply(452, "Unique file name cannot be created."); 2551 return (NULL); 2552 } 2553 2554 /* 2555 * Format and send reply containing system error number. 2556 */ 2557 void 2558 perror_reply(int code, const char *string) 2559 { 2560 int save_errno; 2561 2562 save_errno = errno; 2563 reply(code, "%s: %s.", string, strerror(errno)); 2564 errno = save_errno; 2565 } 2566 2567 static char *onefile[] = { 2568 "", 2569 0 2570 }; 2571 2572 void 2573 send_file_list(const char *whichf) 2574 { 2575 struct stat st; 2576 DIR *dirp = NULL; 2577 struct dirent *dir; 2578 FILE *dout = NULL; 2579 char **dirlist, *dirname, *p; 2580 int simple = 0; 2581 int freeglob = 0; 2582 glob_t gl; 2583 off_t b; 2584 2585 #ifdef __GNUC__ 2586 (void) &dout; 2587 (void) &dirlist; 2588 (void) &simple; 2589 (void) &freeglob; 2590 #endif 2591 2592 p = NULL; 2593 if (strpbrk(whichf, "~{[*?") != NULL) { 2594 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2595 2596 memset(&gl, 0, sizeof(gl)); 2597 freeglob = 1; 2598 if (glob(whichf, flags, 0, &gl)) { 2599 reply(550, "not found"); 2600 goto out; 2601 } else if (gl.gl_pathc == 0) { 2602 errno = ENOENT; 2603 perror_reply(550, whichf); 2604 goto out; 2605 } 2606 dirlist = gl.gl_pathv; 2607 } else { 2608 p = xstrdup(whichf); 2609 onefile[0] = p; 2610 dirlist = onefile; 2611 simple = 1; 2612 } 2613 /* XXX: } for vi sm */ 2614 2615 if (setjmp(urgcatch)) { 2616 transflag = 0; 2617 goto out; 2618 } 2619 while ((dirname = *dirlist++) != NULL) { 2620 int trailingslash = 0; 2621 2622 if (stat(dirname, &st) < 0) { 2623 /* 2624 * If user typed "ls -l", etc, and the client 2625 * used NLST, do what the user meant. 2626 */ 2627 /* XXX: nuke this support? */ 2628 if (dirname[0] == '-' && *dirlist == NULL && 2629 transflag == 0) { 2630 char *argv[] = { INTERNAL_LS, "", NULL }; 2631 2632 argv[1] = dirname; 2633 retrieve(argv, dirname); 2634 goto out; 2635 } 2636 perror_reply(550, whichf); 2637 goto cleanup_send_file_list; 2638 } 2639 2640 if (S_ISREG(st.st_mode)) { 2641 if (dout == NULL) { 2642 dout = dataconn("file list", (off_t)-1, "w"); 2643 if (dout == NULL) 2644 goto out; 2645 transflag++; 2646 } 2647 b = fprintf(dout, "%s%s\n", dirname, 2648 type == TYPE_A ? "\r" : ""); 2649 total_bytes += b; 2650 total_bytes_out += b; 2651 byte_count += strlen(dirname) + 1; 2652 continue; 2653 } else if (!S_ISDIR(st.st_mode)) 2654 continue; 2655 2656 if (dirname[strlen(dirname) - 1] == '/') 2657 trailingslash++; 2658 2659 if ((dirp = opendir(dirname)) == NULL) 2660 continue; 2661 2662 while ((dir = readdir(dirp)) != NULL) { 2663 char nbuf[MAXPATHLEN]; 2664 2665 if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name)) 2666 continue; 2667 2668 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2669 trailingslash ? "" : "/", dir->d_name); 2670 2671 /* 2672 * We have to do a stat to ensure it's 2673 * not a directory or special file. 2674 */ 2675 /* XXX: follow RFC959 and filter out non files ? */ 2676 if (simple || (stat(nbuf, &st) == 0 && 2677 S_ISREG(st.st_mode))) { 2678 char *p; 2679 2680 if (dout == NULL) { 2681 dout = dataconn("file list", (off_t)-1, 2682 "w"); 2683 if (dout == NULL) 2684 goto out; 2685 transflag++; 2686 } 2687 p = nbuf; 2688 if (nbuf[0] == '.' && nbuf[1] == '/') 2689 p = &nbuf[2]; 2690 b = fprintf(dout, "%s%s\n", p, 2691 type == TYPE_A ? "\r" : ""); 2692 total_bytes += b; 2693 total_bytes_out += b; 2694 byte_count += strlen(nbuf) + 1; 2695 } 2696 } 2697 (void) closedir(dirp); 2698 } 2699 2700 if (dout == NULL) 2701 reply(550, "No files found."); 2702 else if (ferror(dout) != 0) 2703 perror_reply(550, "Data connection"); 2704 else 2705 reply(226, "Transfer complete."); 2706 2707 cleanup_send_file_list: 2708 transflag = 0; 2709 closedataconn(dout); 2710 out: 2711 total_xfers++; 2712 total_xfers_out++; 2713 if (p) 2714 free(p); 2715 if (freeglob) 2716 globfree(&gl); 2717 } 2718 2719 char * 2720 conffilename(const char *s) 2721 { 2722 static char filename[MAXPATHLEN]; 2723 2724 if (*s == '/') 2725 strlcpy(filename, s, sizeof(filename)); 2726 else 2727 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2728 return (filename); 2729 } 2730 2731 /* 2732 * logcmd -- 2733 * based on the arguments, syslog a message: 2734 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2735 * else if file2 != NULL "<command> <file1> <file2>" 2736 * else "<command> <file1>" 2737 * if elapsed != NULL, append "in xxx.yyy seconds" 2738 * if error != NULL, append ": " + error 2739 */ 2740 void 2741 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2742 const struct timeval *elapsed, const char *error) 2743 { 2744 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2745 const char *p; 2746 size_t len; 2747 2748 if (logging <=1) 2749 return; 2750 2751 if ((p = realpath(file1, realfile)) == NULL) 2752 p = file1; 2753 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2754 2755 if (bytes != (off_t)-1) { 2756 len += snprintf(buf + len, sizeof(buf) - len, 2757 " = " LLF " byte%s", (LLT) bytes, PLURAL(bytes)); 2758 } else if (file2 != NULL) { 2759 if ((p = realpath(file2, realfile)) == NULL) 2760 p = file2; 2761 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2762 } 2763 2764 if (elapsed != NULL) { 2765 len += snprintf(buf + len, sizeof(buf) - len, 2766 " in %ld.%.03d seconds", elapsed->tv_sec, 2767 (int)(elapsed->tv_usec / 1000)); 2768 } 2769 2770 if (error != NULL) 2771 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2772 2773 syslog(LOG_INFO, "%s", buf); 2774 } 2775 2776 /* 2777 * Determine if `password' is valid for user given in `pw'. 2778 * Returns 2 if password expired, 1 if otherwise failed, 0 if ok 2779 */ 2780 int 2781 checkpassword(const struct passwd *pw, const char *password) 2782 { 2783 char *orig, *new; 2784 time_t expire; 2785 2786 expire = 0; 2787 if (pw == NULL) 2788 return 1; 2789 2790 orig = pw->pw_passwd; /* save existing password */ 2791 expire = pw->pw_expire; 2792 2793 if (orig[0] == '\0') /* don't allow empty passwords */ 2794 return 1; 2795 2796 new = crypt(password, orig); /* encrypt given password */ 2797 if (strcmp(new, orig) != 0) /* compare */ 2798 return 1; 2799 2800 if (expire && time(NULL) >= expire) 2801 return 2; /* check if expired */ 2802 2803 return 0; /* OK! */ 2804 } 2805 2806 char * 2807 xstrdup(const char *s) 2808 { 2809 char *new = strdup(s); 2810 2811 if (new == NULL) 2812 fatal("Local resource failure: malloc"); 2813 /* NOTREACHED */ 2814 return (new); 2815 } 2816 2817 /* 2818 * As per fprintf(), but increment total_bytes and total_bytes_out, 2819 * by the appropriate amount. 2820 */ 2821 void 2822 cprintf(FILE *fd, const char *fmt, ...) 2823 { 2824 off_t b; 2825 va_list ap; 2826 2827 va_start(ap, fmt); 2828 b = vfprintf(fd, fmt, ap); 2829 total_bytes += b; 2830 total_bytes_out += b; 2831 } 2832