ftpd.c revision 1.73
1 /* $NetBSD: ftpd.c,v 1.73 1999/12/12 14:05:54 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-1999 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 1.73 1999/12/12 14:05:54 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 <limits.h> 142 #include <netdb.h> 143 #include <pwd.h> 144 #include <setjmp.h> 145 #include <signal.h> 146 #include <stdio.h> 147 #include <stdlib.h> 148 #include <string.h> 149 #include <syslog.h> 150 #include <time.h> 151 #include <unistd.h> 152 #include <util.h> 153 #ifdef SKEY 154 #include <skey.h> 155 #endif 156 #ifdef KERBEROS5 157 #include <kerberosIV/com_err.h> 158 #include <krb5/krb5.h> 159 #endif 160 161 #include "extern.h" 162 #include "pathnames.h" 163 164 #if __STDC__ 165 #include <stdarg.h> 166 #else 167 #include <varargs.h> 168 #endif 169 170 const char version[] = "NetBSD-ftpd 19991213"; 171 172 union sockunion ctrl_addr; 173 union sockunion data_source; 174 union sockunion data_dest; 175 union sockunion his_addr; 176 union sockunion pasv_addr; 177 178 int data; 179 jmp_buf errcatch, urgcatch; 180 int logged_in; 181 struct passwd *pw; 182 int debug; 183 int sflag; 184 int logging; 185 int type; 186 int form; 187 int stru; /* avoid C keyword */ 188 int mode; 189 int usedefault = 1; /* for data transfers */ 190 int pdata = -1; /* for passive mode */ 191 int family = AF_INET; 192 sig_atomic_t transflag; 193 off_t file_size; 194 off_t byte_count; 195 char tmpline[7]; 196 char hostname[MAXHOSTNAMELEN+1]; 197 char remotehost[MAXHOSTNAMELEN+1]; 198 static char ttyline[20]; 199 char *tty = ttyline; /* for klogin */ 200 201 off_t total_data_in; /* total file data bytes received */ 202 off_t total_data_out; /* total file data bytes sent data */ 203 off_t total_data; /* total file data bytes transferred data */ 204 off_t total_files_in; /* total number of data files received */ 205 off_t total_files_out; /* total number of data files sent */ 206 off_t total_files; /* total number of data files transferred */ 207 off_t total_bytes_in; /* total bytes received */ 208 off_t total_bytes_out; /* total bytes sent */ 209 off_t total_bytes; /* total bytes transferred */ 210 off_t total_xfers_in; /* total number of xfers incoming */ 211 off_t total_xfers_out; /* total number of xfers outgoing */ 212 off_t total_xfers; /* total number of xfers */ 213 214 static char *anondir = NULL; 215 static char confdir[MAXPATHLEN]; 216 217 #if defined(KERBEROS) || defined(KERBEROS5) 218 int notickets = 1; 219 char *krbtkfile_env = NULL; 220 #endif 221 222 int epsvall = 0; 223 224 /* 225 * Timeout intervals for retrying connections 226 * to hosts that don't accept PORT cmds. This 227 * is a kludge, but given the problems with TCP... 228 */ 229 #define SWAITMAX 90 /* wait at most 90 seconds */ 230 #define SWAITINT 5 /* interval between retries */ 231 232 int swaitmax = SWAITMAX; 233 int swaitint = SWAITINT; 234 235 #ifdef HASSETPROCTITLE 236 char proctitle[BUFSIZ]; /* initial part of title */ 237 #endif /* HASSETPROCTITLE */ 238 239 static void ack __P((const char *)); 240 static void myoob __P((int)); 241 static int checkuser __P((const char *, const char *, int, int, char **)); 242 static int checkaccess __P((const char *)); 243 static FILE *dataconn __P((const char *, off_t, const char *)); 244 static void dolog __P((struct sockaddr *)); 245 static void end_login __P((void)); 246 static FILE *getdatasock __P((const char *)); 247 static char *gunique __P((const char *)); 248 static void lostconn __P((int)); 249 static int receive_data __P((FILE *, FILE *)); 250 static void replydirname __P((const char *, const char *)); 251 static int send_data __P((FILE *, FILE *, off_t, int)); 252 static struct passwd * 253 sgetpwnam __P((const char *)); 254 255 int main __P((int, char *[])); 256 257 #if defined(KERBEROS) || defined(KERBEROS5) 258 int klogin __P((struct passwd *, char *, char *, char *)); 259 void kdestroy __P((void)); 260 #endif 261 262 int 263 main(argc, argv) 264 int argc; 265 char *argv[]; 266 { 267 int addrlen, ch, on = 1, tos, keepalive; 268 #ifdef KERBEROS5 269 krb5_error_code kerror; 270 #endif 271 272 debug = 0; 273 logging = 0; 274 sflag = 0; 275 (void)strcpy(confdir, _DEFAULT_CONFDIR); 276 277 while ((ch = getopt(argc, argv, "a:c:C:dlst:T:u:v46")) != -1) { 278 switch (ch) { 279 case 'a': 280 anondir = optarg; 281 break; 282 283 case 'c': 284 (void)strlcpy(confdir, optarg, sizeof(confdir)); 285 break; 286 287 case 'C': 288 exit(checkaccess(optarg) ? 0 : 1); 289 /* NOTREACHED */ 290 291 case 'd': 292 case 'v': /* deprecated */ 293 debug = 1; 294 break; 295 296 case 'l': 297 logging++; /* > 1 == extra logging */ 298 break; 299 300 case 's': 301 sflag = 1; 302 break; 303 304 case 't': 305 case 'T': 306 case 'u': 307 warnx("-%c has been deprecated in favour of ftpd.conf", 308 ch); 309 break; 310 311 case '4': 312 family = AF_INET; 313 break; 314 315 case '6': 316 family = AF_INET6; 317 break; 318 319 default: 320 if (optopt == 'a' || optopt == 'C') 321 exit(1); 322 warnx("unknown flag -%c ignored", optopt); 323 break; 324 } 325 } 326 327 /* 328 * LOG_NDELAY sets up the logging connection immediately, 329 * necessary for anonymous ftp's that chroot and can't do it later. 330 */ 331 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 332 addrlen = sizeof(his_addr); /* xxx */ 333 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 334 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 335 exit(1); 336 } 337 addrlen = sizeof(ctrl_addr); 338 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 339 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 340 exit(1); 341 } 342 if (his_addr.su_family == AF_INET6 343 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 344 #if 1 345 /* 346 * IPv4 control connection arrived to AF_INET6 socket. 347 * I hate to do this, but this is the easiest solution. 348 */ 349 union sockunion tmp_addr; 350 351 tmp_addr = his_addr; 352 memset(&his_addr, 0, sizeof(his_addr)); 353 his_addr.su_sin.sin_family = AF_INET; 354 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 355 memcpy(&his_addr.su_sin.sin_addr, 356 &tmp_addr.su_sin6.sin6_addr.s6_addr32[3], 357 sizeof(his_addr.su_sin.sin_addr)); 358 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 359 360 tmp_addr = ctrl_addr; 361 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 362 ctrl_addr.su_sin.sin_family = AF_INET; 363 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 364 memcpy(&ctrl_addr.su_sin.sin_addr, 365 &tmp_addr.su_sin6.sin6_addr.s6_addr32[3], 366 sizeof(ctrl_addr.su_sin.sin_addr)); 367 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 368 #else 369 while (fgets(line, sizeof(line), fd) != NULL) { 370 if ((cp = strchr(line, '\n')) != NULL) 371 *cp = '\0'; 372 lreply(530, "%s", line); 373 } 374 (void) fflush(stdout); 375 (void) fclose(fd); 376 reply(530, 377 "Connection from IPv4 mapped address is not supported."); 378 exit(0); 379 #endif 380 } 381 #ifdef IP_TOS 382 if (family == AF_INET) { 383 tos = IPTOS_LOWDELAY; 384 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 385 sizeof(int)) < 0) 386 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 387 } 388 #endif 389 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 390 391 /* set this here so klogin can use it... */ 392 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 393 394 (void) freopen(_PATH_DEVNULL, "w", stderr); 395 (void) signal(SIGPIPE, lostconn); 396 (void) signal(SIGCHLD, SIG_IGN); 397 if ((long)signal(SIGURG, myoob) < 0) 398 syslog(LOG_ERR, "signal: %m"); 399 400 /* Try to handle urgent data inline */ 401 #ifdef SO_OOBINLINE 402 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 403 syslog(LOG_ERR, "setsockopt: %m"); 404 #endif 405 /* Set keepalives on the socket to detect dropped connections. */ 406 #ifdef SO_KEEPALIVE 407 keepalive = 1; 408 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 409 sizeof(int)) < 0) 410 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 411 #endif 412 413 #ifdef F_SETOWN 414 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 415 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 416 #endif 417 dolog((struct sockaddr *)&his_addr); 418 /* 419 * Set up default state 420 */ 421 data = -1; 422 type = TYPE_A; 423 form = FORM_N; 424 stru = STRU_F; 425 mode = MODE_S; 426 tmpline[0] = '\0'; 427 hasyyerrored = 0; 428 429 #ifdef KERBEROS5 430 kerror = krb5_init_context(&kcontext); 431 if (kerror) { 432 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 433 error_message(kerror)); 434 exit(0); 435 } 436 #endif /* KERBEROS5 */ 437 438 /* If logins are disabled, print out the message. */ 439 if (format_file(_PATH_NOLOGIN, 530)) { 440 reply(530, "System not available."); 441 exit(0); 442 } 443 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 444 /* reply(220,) must follow */ 445 (void)gethostname(hostname, sizeof(hostname)); 446 hostname[sizeof(hostname) - 1] = '\0'; 447 reply(220, "%s FTP server (%s) ready.", hostname, version); 448 449 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 450 curclass.type = CLASS_REAL; 451 452 (void) setjmp(errcatch); 453 for (;;) 454 (void) yyparse(); 455 /* NOTREACHED */ 456 } 457 458 static void 459 lostconn(signo) 460 int signo; 461 { 462 463 if (debug) 464 syslog(LOG_DEBUG, "lost connection"); 465 dologout(1); 466 } 467 468 /* 469 * Save the result of a getpwnam. Used for USER command, since 470 * the data returned must not be clobbered by any other command 471 * (e.g., globbing). 472 */ 473 static struct passwd * 474 sgetpwnam(name) 475 const char *name; 476 { 477 static struct passwd save; 478 struct passwd *p; 479 480 if ((p = getpwnam(name)) == NULL) 481 return (p); 482 if (save.pw_name) { 483 free((char *)save.pw_name); 484 free((char *)save.pw_passwd); 485 free((char *)save.pw_gecos); 486 free((char *)save.pw_dir); 487 free((char *)save.pw_shell); 488 } 489 save = *p; 490 save.pw_name = xstrdup(p->pw_name); 491 save.pw_passwd = xstrdup(p->pw_passwd); 492 save.pw_gecos = xstrdup(p->pw_gecos); 493 save.pw_dir = xstrdup(p->pw_dir); 494 save.pw_shell = xstrdup(p->pw_shell); 495 return (&save); 496 } 497 498 static int login_attempts; /* number of failed login attempts */ 499 static int askpasswd; /* had user command, ask for passwd */ 500 static char curname[10]; /* current USER name */ 501 502 /* 503 * USER command. 504 * Sets global passwd pointer pw if named account exists and is acceptable; 505 * sets askpasswd if a PASS command is expected. If logged in previously, 506 * need to reset state. If name is "ftp" or "anonymous", the name is not in 507 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 508 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 509 * requesting login privileges. Disallow anyone who does not have a standard 510 * shell as returned by getusershell(). Disallow anyone mentioned in the file 511 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 512 */ 513 void 514 user(name) 515 const char *name; 516 { 517 if (logged_in) { 518 switch (curclass.type) { 519 case CLASS_GUEST: 520 reply(530, "Can't change user from guest login."); 521 return; 522 case CLASS_CHROOT: 523 reply(530, "Can't change user from chroot user."); 524 return; 525 case CLASS_REAL: 526 end_login(); 527 break; 528 default: 529 abort(); 530 } 531 } 532 533 #if defined(KERBEROS) || defined(KERBEROS5) 534 kdestroy(); 535 #endif 536 537 curclass.type = CLASS_REAL; 538 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 539 if (! checkaccess("ftp") && ! checkaccess("anonymous")) 540 reply(530, "User %s access denied.", name); 541 else if ((pw = sgetpwnam("ftp")) != NULL) { 542 curclass.type = CLASS_GUEST; 543 askpasswd = 1; 544 reply(331, 545 "Guest login ok, type your name as password."); 546 } else 547 reply(530, "User %s unknown.", name); 548 if (!askpasswd && logging) 549 syslog(LOG_NOTICE, 550 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 551 return; 552 } 553 554 pw = sgetpwnam(name); 555 if (logging) 556 strlcpy(curname, name, sizeof(curname)); 557 558 #ifdef SKEY 559 if (skey_haskey(name) == 0) { 560 char *myskey; 561 562 myskey = skey_keyinfo(name); 563 reply(331, "Password [%s] required for %s.", 564 myskey ? myskey : "error getting challenge", name); 565 } else 566 #endif 567 reply(331, "Password required for %s.", name); 568 569 askpasswd = 1; 570 /* 571 * Delay before reading passwd after first failed 572 * attempt to slow down passwd-guessing programs. 573 */ 574 if (login_attempts) 575 sleep((unsigned) login_attempts); 576 } 577 578 /* 579 * Determine whether something is to happen (allow access, chroot) 580 * for a user. Each line is a shell-style glob followed by 581 * `yes' or `no'. 582 * 583 * For backward compatability, `allow' and `deny' are synonymns 584 * for `yes' and `no', respectively. 585 * 586 * Each glob is matched against the username in turn, and the first 587 * match found is used. If no match is found, the result is the 588 * argument `def'. If a match is found but without and explicit 589 * `yes'/`no', the result is the opposite of def. 590 * 591 * If the file doesn't exist at all, the result is the argument 592 * `nofile' 593 * 594 * Any line starting with `#' is considered a comment and ignored. 595 * 596 * Returns 0 if the user is denied, or 1 if they are allowed. 597 */ 598 int 599 checkuser(fname, name, def, nofile, retclass) 600 const char *fname, *name; 601 int def, nofile; 602 char **retclass; 603 { 604 FILE *fd; 605 int retval; 606 char *glob, *perm, *class, *buf, *p; 607 size_t len; 608 609 retval = def; 610 if (retclass != NULL) 611 *retclass = NULL; 612 if ((fd = fopen(conffilename(fname), "r")) == NULL) 613 return nofile; 614 615 for (; 616 (buf = fparseln(fd, &len, NULL, NULL, FPARSELN_UNESCCOMM | 617 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 618 free(buf), buf = NULL) { 619 glob = perm = class = NULL; 620 p = buf; 621 if (len < 1) 622 continue; 623 if (p[len - 1] == '\n') 624 p[--len] = '\0'; 625 if (EMPTYSTR(p)) 626 continue; 627 628 NEXTWORD(p, glob); 629 NEXTWORD(p, perm); 630 NEXTWORD(p, class); 631 if (EMPTYSTR(glob)) 632 continue; 633 634 /* have a host specifier */ 635 if ((p = strchr(glob, '@')) != NULL) { 636 u_int32_t net, mask, addr; 637 int bits; 638 639 *p++ = '\0'; 640 /* check against network or CIDR */ 641 if (isdigit(*p) && 642 (bits = inet_net_pton(AF_INET, p, 643 &net, sizeof(net))) != -1) { 644 net = ntohl(net); 645 mask = 0xffffffffU << (32 - bits); 646 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 647 if ((addr & mask) != net) 648 continue; 649 650 /* check against hostname glob */ 651 } else if (fnmatch(p, remotehost, 0) != 0) 652 continue; 653 } 654 655 /* check against username glob */ 656 if (fnmatch(glob, name, 0) != 0) 657 continue; 658 659 if (perm != NULL && 660 ((strcasecmp(perm, "allow") == 0) || 661 (strcasecmp(perm, "yes") == 0))) 662 retval = 1; 663 else if (perm != NULL && 664 ((strcasecmp(perm, "deny") == 0) || 665 (strcasecmp(perm, "no") == 0))) 666 retval = 0; 667 else 668 retval = !def; 669 if (!EMPTYSTR(class) && retclass != NULL) 670 *retclass = xstrdup(class); 671 free(buf); 672 break; 673 } 674 (void) fclose(fd); 675 return (retval); 676 } 677 678 /* 679 * Check if user is allowed by /etc/ftpusers 680 * returns 1 for yes, 0 for no 681 */ 682 int 683 checkaccess(name) 684 const char *name; 685 { 686 687 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 688 } 689 690 /* 691 * Terminate login as previous user, if any, resetting state; 692 * used when USER command is given or login fails. 693 */ 694 static void 695 end_login() 696 { 697 698 (void) seteuid((uid_t)0); 699 if (logged_in) 700 logwtmp(ttyline, "", ""); 701 pw = NULL; 702 logged_in = 0; 703 curclass.type = CLASS_REAL; 704 } 705 706 void 707 pass(passwd) 708 const char *passwd; 709 { 710 int rval; 711 const char *cp, *shell, *home; 712 char *class; 713 714 class = NULL; 715 if (logged_in || askpasswd == 0) { 716 reply(503, "Login with USER first."); 717 return; 718 } 719 askpasswd = 0; 720 if (curclass.type != CLASS_GUEST) { 721 /* "ftp" is only account allowed no password */ 722 if (pw == NULL) { 723 rval = 1; /* failure below */ 724 goto skip; 725 } 726 #if defined(KERBEROS) || defined(KERBEROS5) 727 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 728 rval = 0; 729 goto skip; 730 } 731 #endif 732 #ifdef SKEY 733 if (skey_haskey(pw->pw_name) == 0) { 734 char *p; 735 int r; 736 737 p = xstrdup(passwd); 738 r = skey_passcheck(pw->pw_name, p); 739 free(p); 740 if (r != -1) { 741 rval = 0; 742 goto skip; 743 } 744 } 745 #endif 746 if (!sflag && *pw->pw_passwd != '\0' && 747 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 748 rval = 0; 749 goto skip; 750 } 751 rval = 1; 752 753 skip: 754 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 755 rval = 2; 756 /* 757 * If rval > 0, the user failed the authentication check 758 * above. If rval == 0, either Kerberos or local authentication 759 * succeeded. 760 */ 761 if (rval) { 762 reply(530, rval == 2 ? "Password expired." : 763 "Login incorrect."); 764 if (logging) { 765 syslog(LOG_NOTICE, 766 "FTP LOGIN FAILED FROM %s", remotehost); 767 syslog(LOG_AUTHPRIV | LOG_NOTICE, 768 "FTP LOGIN FAILED FROM %s, %s", 769 remotehost, curname); 770 } 771 pw = NULL; 772 if (login_attempts++ >= 5) { 773 syslog(LOG_NOTICE, 774 "repeated login failures from %s", 775 remotehost); 776 exit(0); 777 } 778 return; 779 } 780 } 781 782 /* password was ok; see if anything else prevents login */ 783 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 784 reply(530, "User %s may not use FTP.", pw->pw_name); 785 if (logging) 786 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 787 remotehost, pw->pw_name); 788 pw = (struct passwd *) NULL; 789 goto cleanuppass; 790 } 791 /* check for valid shell, if not guest user */ 792 if ((shell = pw->pw_shell) == NULL || *shell == 0) 793 shell = _PATH_BSHELL; 794 while ((cp = getusershell()) != NULL) 795 if (strcmp(cp, shell) == 0) 796 break; 797 endusershell(); 798 if (cp == NULL && curclass.type != CLASS_GUEST) { 799 reply(530, "User %s may not use FTP.", pw->pw_name); 800 if (logging) 801 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 802 remotehost, pw->pw_name); 803 pw = (struct passwd *) NULL; 804 goto cleanuppass; 805 } 806 807 login_attempts = 0; /* this time successful */ 808 if (setegid((gid_t)pw->pw_gid) < 0) { 809 reply(550, "Can't set gid."); 810 goto cleanuppass; 811 } 812 (void) initgroups(pw->pw_name, pw->pw_gid); 813 814 /* open wtmp before chroot */ 815 logwtmp(ttyline, pw->pw_name, remotehost); 816 logged_in = 1; 817 818 /* check user in /etc/ftpchroot */ 819 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 820 if (curclass.type == CLASS_GUEST) { 821 syslog(LOG_NOTICE, 822 "Can't change guest user to chroot class; remove entry in %s", 823 _PATH_FTPCHROOT); 824 exit(1); 825 } 826 curclass.type = CLASS_CHROOT; 827 } 828 if (class == NULL) { 829 switch (curclass.type) { 830 case CLASS_GUEST: 831 class = xstrdup("guest"); 832 break; 833 case CLASS_CHROOT: 834 class = xstrdup("chroot"); 835 break; 836 case CLASS_REAL: 837 class = xstrdup("real"); 838 break; 839 default: 840 abort(); 841 } 842 } 843 844 /* parse ftpd.conf, setting up various parameters */ 845 parse_conf(class); 846 847 home = "/"; 848 switch (curclass.type) { 849 case CLASS_GUEST: 850 /* 851 * We MUST do a chdir() after the chroot. Otherwise 852 * the old current directory will be accessible as "." 853 * outside the new root! 854 */ 855 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 856 chdir("/") < 0) { 857 reply(550, "Can't set guest privileges."); 858 goto bad; 859 } 860 break; 861 case CLASS_CHROOT: 862 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 863 reply(550, "Can't change root."); 864 goto bad; 865 } 866 break; 867 case CLASS_REAL: 868 if (chdir(pw->pw_dir) < 0) { 869 if (chdir("/") < 0) { 870 reply(530, 871 "User %s: can't change directory to %s.", 872 pw->pw_name, pw->pw_dir); 873 goto bad; 874 } else 875 lreply(230, 876 "No directory! Logging in with home=/"); 877 } else 878 home = pw->pw_dir; 879 break; 880 } 881 if (seteuid((uid_t)pw->pw_uid) < 0) { 882 reply(550, "Can't set uid."); 883 goto bad; 884 } 885 setenv("HOME", home, 1); 886 887 /* 888 * Display a login message, if it exists. 889 * N.B. reply(230,) must follow the message. 890 */ 891 (void)format_file(conffilename(curclass.motd), 230); 892 show_chdir_messages(230); 893 if (curclass.type == CLASS_GUEST) { 894 reply(230, "Guest login ok, access restrictions apply."); 895 #ifdef HASSETPROCTITLE 896 snprintf(proctitle, sizeof(proctitle), 897 "%s: anonymous/%.*s", remotehost, 898 (int) (sizeof(proctitle) - sizeof(remotehost) - 899 sizeof(": anonymous/")), passwd); 900 setproctitle(proctitle); 901 #endif /* HASSETPROCTITLE */ 902 if (logging) 903 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 904 remotehost, passwd); 905 } else { 906 reply(230, "User %s logged in.", pw->pw_name); 907 #ifdef HASSETPROCTITLE 908 snprintf(proctitle, sizeof(proctitle), 909 "%s: %s", remotehost, pw->pw_name); 910 setproctitle(proctitle); 911 #endif /* HASSETPROCTITLE */ 912 if (logging) 913 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 914 remotehost, pw->pw_name); 915 } 916 (void) umask(curclass.umask); 917 goto cleanuppass; 918 bad: 919 /* Forget all about it... */ 920 end_login(); 921 cleanuppass: 922 if (class) 923 free(class); 924 } 925 926 void 927 retrieve(argv, name) 928 char *argv[]; 929 const char *name; 930 { 931 FILE *fin = NULL, *dout; 932 struct stat st; 933 int (*closefunc) __P((FILE *)) = NULL; 934 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 935 struct timeval start, finish, td, *tdp; 936 const char *dispname; 937 938 sendrv = closerv = stderrfd = -1; 939 isconversion = isdata = isls = log = 0; 940 tdp = NULL; 941 dispname = name; 942 if (argv == NULL) { 943 log = 1; 944 isdata = 1; 945 fin = fopen(name, "r"); 946 closefunc = fclose; 947 if (fin == NULL) 948 argv = do_conversion(name); 949 if (argv != NULL) { 950 isconversion++; 951 syslog(LOG_INFO, "get command: '%s' on '%s'", 952 argv[0], name); 953 } 954 } 955 if (argv != NULL) { 956 char temp[MAXPATHLEN + 1]; 957 958 if (strcmp(argv[0], INTERNAL_LS) == 0) { 959 isls = 1; 960 stderrfd = -1; 961 } else { 962 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 963 stderrfd = mkstemp(temp); 964 if (stderrfd != -1) 965 (void)unlink(temp); 966 } 967 dispname = argv[0]; 968 fin = ftpd_popen(argv, "r", stderrfd); 969 closefunc = ftpd_pclose; 970 st.st_size = -1; 971 st.st_blksize = BUFSIZ; 972 } 973 if (fin == NULL) { 974 if (errno != 0) { 975 perror_reply(550, dispname); 976 if (log) 977 logcmd("get", -1, name, NULL, NULL, 978 strerror(errno)); 979 } 980 goto cleanupretrieve; 981 } 982 byte_count = -1; 983 if (argv == NULL 984 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 985 reply(550, "%s: not a plain file.", dispname); 986 goto done; 987 } 988 if (restart_point) { 989 if (type == TYPE_A) { 990 off_t i; 991 int c; 992 993 for (i = 0; i < restart_point; i++) { 994 if ((c=getc(fin)) == EOF) { 995 perror_reply(550, dispname); 996 goto done; 997 } 998 if (c == '\n') 999 i++; 1000 } 1001 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1002 perror_reply(550, dispname); 1003 goto done; 1004 } 1005 } 1006 dout = dataconn(dispname, st.st_size, "w"); 1007 if (dout == NULL) 1008 goto done; 1009 1010 (void)gettimeofday(&start, NULL); 1011 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1012 (void)gettimeofday(&finish, NULL); 1013 (void) fclose(dout); 1014 timersub(&finish, &start, &td); 1015 tdp = &td; 1016 data = -1; 1017 pdata = -1; 1018 done: 1019 if (log) 1020 logcmd("get", byte_count, name, NULL, tdp, NULL); 1021 closerv = (*closefunc)(fin); 1022 if (sendrv == 0) { 1023 FILE *err; 1024 struct stat sb; 1025 1026 if (!isls && argv != NULL && closerv != 0) { 1027 lreply(226, 1028 "Command returned an exit status of %d", 1029 closerv); 1030 if (isconversion) 1031 syslog(LOG_INFO, 1032 "retrieve command: '%s' returned %d", 1033 argv[0], closerv); 1034 } 1035 if (!isls && argv != NULL && stderrfd != -1 && 1036 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1037 ((err = fdopen(stderrfd, "r")) != NULL)) { 1038 char *cp, line[LINE_MAX]; 1039 1040 lreply(226, "Command error messages:"); 1041 rewind(err); 1042 while (fgets(line, sizeof(line), err) != NULL) { 1043 if ((cp = strchr(line, '\n')) != NULL) 1044 *cp = '\0'; 1045 lreply(0, " %s", line); 1046 } 1047 (void) fflush(stdout); 1048 (void) fclose(err); 1049 /* a reply(226,) must follow */ 1050 } 1051 reply(226, "Transfer complete."); 1052 } 1053 cleanupretrieve: 1054 if (stderrfd != -1) 1055 (void)close(stderrfd); 1056 if (isconversion) 1057 free(argv); 1058 } 1059 1060 void 1061 store(name, mode, unique) 1062 const char *name, *mode; 1063 int unique; 1064 { 1065 FILE *fout, *din; 1066 struct stat st; 1067 int (*closefunc) __P((FILE *)); 1068 struct timeval start, finish, td, *tdp; 1069 char *desc; 1070 1071 desc = (*mode == 'w') ? "put" : "append"; 1072 if (unique && stat(name, &st) == 0 && 1073 (name = gunique(name)) == NULL) { 1074 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1075 return; 1076 } 1077 1078 if (restart_point) 1079 mode = "r+"; 1080 fout = fopen(name, mode); 1081 closefunc = fclose; 1082 tdp = NULL; 1083 if (fout == NULL) { 1084 perror_reply(553, name); 1085 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1086 return; 1087 } 1088 byte_count = -1; 1089 if (restart_point) { 1090 if (type == TYPE_A) { 1091 off_t i; 1092 int c; 1093 1094 for (i = 0; i < restart_point; i++) { 1095 if ((c=getc(fout)) == EOF) { 1096 perror_reply(550, name); 1097 goto done; 1098 } 1099 if (c == '\n') 1100 i++; 1101 } 1102 /* 1103 * We must do this seek to "current" position 1104 * because we are changing from reading to 1105 * writing. 1106 */ 1107 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1108 perror_reply(550, name); 1109 goto done; 1110 } 1111 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1112 perror_reply(550, name); 1113 goto done; 1114 } 1115 } 1116 din = dataconn(name, (off_t)-1, "r"); 1117 if (din == NULL) 1118 goto done; 1119 (void)gettimeofday(&start, NULL); 1120 if (receive_data(din, fout) == 0) { 1121 if (unique) 1122 reply(226, "Transfer complete (unique file name:%s).", 1123 name); 1124 else 1125 reply(226, "Transfer complete."); 1126 } 1127 (void)gettimeofday(&finish, NULL); 1128 (void) fclose(din); 1129 timersub(&finish, &start, &td); 1130 tdp = &td; 1131 data = -1; 1132 pdata = -1; 1133 done: 1134 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1135 (*closefunc)(fout); 1136 } 1137 1138 static FILE * 1139 getdatasock(mode) 1140 const char *mode; 1141 { 1142 int on = 1, s, t, tries; 1143 1144 if (data >= 0) 1145 return (fdopen(data, mode)); 1146 (void) seteuid((uid_t)0); 1147 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1148 if (s < 0) 1149 goto bad; 1150 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1151 (char *) &on, sizeof(on)) < 0) 1152 goto bad; 1153 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1154 (char *) &on, sizeof(on)) < 0) 1155 goto bad; 1156 /* anchor socket to avoid multi-homing problems */ 1157 data_source = ctrl_addr; 1158 data_source.su_port = htons(20); /* ftp-data port */ 1159 for (tries = 1; ; tries++) { 1160 if (bind(s, (struct sockaddr *)&data_source, 1161 data_source.su_len) >= 0) 1162 break; 1163 if (errno != EADDRINUSE || tries > 10) 1164 goto bad; 1165 sleep(tries); 1166 } 1167 (void) seteuid((uid_t)pw->pw_uid); 1168 #ifdef IP_TOS 1169 if (ctrl_addr.su_family == AF_INET) { 1170 on = IPTOS_THROUGHPUT; 1171 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1172 sizeof(int)) < 0) 1173 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1174 } 1175 #endif 1176 return (fdopen(s, mode)); 1177 bad: 1178 /* Return the real value of errno (close may change it) */ 1179 t = errno; 1180 (void) seteuid((uid_t)pw->pw_uid); 1181 (void) close(s); 1182 errno = t; 1183 return (NULL); 1184 } 1185 1186 static FILE * 1187 dataconn(name, size, mode) 1188 const char *name; 1189 off_t size; 1190 const char *mode; 1191 { 1192 char sizebuf[32]; 1193 FILE *file; 1194 int retry = 0, tos, keepalive; 1195 1196 file_size = size; 1197 byte_count = 0; 1198 if (size != (off_t) -1) 1199 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1200 (qdfmt_t)size, PLURAL(size)); 1201 else 1202 sizebuf[0] = '\0'; 1203 if (pdata >= 0) { 1204 union sockunion from; 1205 int s, fromlen = sizeof(from); 1206 1207 (void) alarm(curclass.timeout); 1208 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1209 (void) alarm(0); 1210 if (s < 0) { 1211 reply(425, "Can't open data connection."); 1212 (void) close(pdata); 1213 pdata = -1; 1214 return (NULL); 1215 } 1216 (void) close(pdata); 1217 pdata = s; 1218 switch (from.su_family) { 1219 case AF_INET: 1220 #ifdef IP_TOS 1221 tos = IPTOS_THROUGHPUT; 1222 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1223 sizeof(int)); 1224 break; 1225 #endif 1226 } 1227 /* Set keepalives on the socket to detect dropped conns. */ 1228 #ifdef SO_KEEPALIVE 1229 keepalive = 1; 1230 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1231 (char *)&keepalive, sizeof(int)); 1232 #endif 1233 reply(150, "Opening %s mode data connection for '%s'%s.", 1234 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1235 return (fdopen(pdata, mode)); 1236 } 1237 if (data >= 0) { 1238 reply(125, "Using existing data connection for '%s'%s.", 1239 name, sizebuf); 1240 usedefault = 1; 1241 return (fdopen(data, mode)); 1242 } 1243 if (usedefault) 1244 data_dest = his_addr; 1245 usedefault = 1; 1246 file = getdatasock(mode); 1247 if (file == NULL) { 1248 char hbuf[INET6_ADDRSTRLEN]; 1249 char pbuf[10]; 1250 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1251 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1252 NI_NUMERICHOST | NI_NUMERICSERV); 1253 reply(425, "Can't create data socket (%s,%s): %s.", 1254 hbuf, pbuf, strerror(errno)); 1255 return (NULL); 1256 } 1257 data = fileno(file); 1258 while (connect(data, (struct sockaddr *)&data_dest, 1259 data_dest.su_len) < 0) { 1260 if (errno == EADDRINUSE && retry < swaitmax) { 1261 sleep((unsigned) swaitint); 1262 retry += swaitint; 1263 continue; 1264 } 1265 perror_reply(425, "Can't build data connection"); 1266 (void) fclose(file); 1267 data = -1; 1268 return (NULL); 1269 } 1270 reply(150, "Opening %s mode data connection for '%s'%s.", 1271 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1272 return (file); 1273 } 1274 1275 /* 1276 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1277 * encapsulation of the data subject * to Mode, Structure, and Type. 1278 * 1279 * NB: Form isn't handled. 1280 */ 1281 static int 1282 send_data(instr, outstr, blksize, isdata) 1283 FILE *instr, *outstr; 1284 off_t blksize; 1285 int isdata; 1286 { 1287 int c, filefd, netfd, rval; 1288 char *buf; 1289 1290 transflag = 1; 1291 rval = -1; 1292 buf = NULL; 1293 if (setjmp(urgcatch)) 1294 goto cleanup_send_data; 1295 1296 switch (type) { 1297 1298 case TYPE_A: 1299 /* XXXX: rate limit ascii send (get) */ 1300 (void) alarm(curclass.timeout); 1301 while ((c = getc(instr)) != EOF) { 1302 byte_count++; 1303 if (c == '\n') { 1304 if (ferror(outstr)) 1305 goto data_err; 1306 (void) putc('\r', outstr); 1307 if (isdata) { 1308 total_data_out++; 1309 total_data++; 1310 } 1311 total_bytes_out++; 1312 total_bytes++; 1313 } 1314 (void) putc(c, outstr); 1315 if (isdata) { 1316 total_data_out++; 1317 total_data++; 1318 } 1319 total_bytes_out++; 1320 total_bytes++; 1321 if ((byte_count % 4096) == 0) 1322 (void) alarm(curclass.timeout); 1323 } 1324 (void) alarm(0); 1325 fflush(outstr); 1326 if (ferror(instr)) 1327 goto file_err; 1328 if (ferror(outstr)) 1329 goto data_err; 1330 rval = 0; 1331 goto cleanup_send_data; 1332 1333 case TYPE_I: 1334 case TYPE_L: 1335 if ((buf = malloc((size_t)blksize)) == NULL) { 1336 perror_reply(451, "Local resource failure: malloc"); 1337 goto cleanup_send_data; 1338 } 1339 filefd = fileno(instr); 1340 netfd = fileno(outstr); 1341 (void) alarm(curclass.timeout); 1342 if (curclass.rateget) { 1343 while (1) { 1344 int d; 1345 struct timeval then, now, td; 1346 off_t bufrem; 1347 char *bufp; 1348 1349 (void)gettimeofday(&then, NULL); 1350 errno = c = d = 0; 1351 bufrem = curclass.rateget; 1352 while (bufrem > 0) { 1353 if ((c = read(filefd, buf, 1354 MIN(blksize, bufrem))) <= 0) 1355 goto senddone; 1356 (void) alarm(curclass.timeout); 1357 bufrem -= c; 1358 byte_count += c; 1359 if (isdata) { 1360 total_data_out += c; 1361 total_data += c; 1362 } 1363 total_bytes_out += c; 1364 total_bytes += c; 1365 for (bufp = buf; c > 0; 1366 c -= d, bufp += d) 1367 if ((d = 1368 write(netfd, bufp, c)) <= 0) 1369 break; 1370 if (d < 0) 1371 goto data_err; 1372 } 1373 (void)gettimeofday(&now, NULL); 1374 timersub(&now, &then, &td); 1375 if (td.tv_sec > 0) 1376 break; 1377 usleep(1000000 - td.tv_usec); 1378 } 1379 } else { 1380 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1381 if (write(netfd, buf, c) != c) 1382 goto data_err; 1383 (void) alarm(curclass.timeout); 1384 byte_count += c; 1385 if (isdata) { 1386 total_data_out += c; 1387 total_data += c; 1388 } 1389 total_bytes_out += c; 1390 total_bytes += c; 1391 } 1392 } 1393 senddone: 1394 if (c < 0) 1395 goto file_err; 1396 rval = 0; 1397 goto cleanup_send_data; 1398 1399 default: 1400 reply(550, "Unimplemented TYPE %d in send_data", type); 1401 goto cleanup_send_data; 1402 } 1403 1404 data_err: 1405 (void) alarm(0); 1406 perror_reply(426, "Data connection"); 1407 goto cleanup_send_data; 1408 1409 file_err: 1410 (void) alarm(0); 1411 perror_reply(551, "Error on input file"); 1412 /* FALLTHROUGH */ 1413 1414 cleanup_send_data: 1415 (void) alarm(0); 1416 transflag = 0; 1417 if (buf) 1418 free(buf); 1419 if (isdata) { 1420 total_files_out++; 1421 total_files++; 1422 } 1423 total_xfers_out++; 1424 total_xfers++; 1425 return (rval); 1426 } 1427 1428 /* 1429 * Transfer data from peer to "outstr" using the appropriate encapulation of 1430 * the data subject to Mode, Structure, and Type. 1431 * 1432 * N.B.: Form isn't handled. 1433 */ 1434 static int 1435 receive_data(instr, outstr) 1436 FILE *instr, *outstr; 1437 { 1438 int c, bare_lfs, netfd, filefd, rval; 1439 char buf[BUFSIZ]; 1440 #ifdef __GNUC__ 1441 (void) &bare_lfs; 1442 #endif 1443 1444 bare_lfs = 0; 1445 transflag = 1; 1446 rval = -1; 1447 if (setjmp(urgcatch)) 1448 goto cleanup_recv_data; 1449 1450 switch (type) { 1451 1452 case TYPE_I: 1453 case TYPE_L: 1454 netfd = fileno(instr); 1455 filefd = fileno(outstr); 1456 (void) alarm(curclass.timeout); 1457 if (curclass.rateput) { 1458 while (1) { 1459 int d; 1460 struct timeval then, now, td; 1461 off_t bufrem; 1462 1463 (void)gettimeofday(&then, NULL); 1464 errno = c = d = 0; 1465 for (bufrem = curclass.rateput; bufrem > 0; ) { 1466 if ((c = read(netfd, buf, 1467 MIN(sizeof(buf), bufrem))) <= 0) 1468 goto recvdone; 1469 if ((d = write(filefd, buf, c)) != c) 1470 goto recvdone; 1471 (void) alarm(curclass.timeout); 1472 bufrem -= c; 1473 byte_count += c; 1474 total_data_in += c; 1475 total_data += c; 1476 total_bytes_in += c; 1477 total_bytes += c; 1478 } 1479 (void)gettimeofday(&now, NULL); 1480 timersub(&now, &then, &td); 1481 if (td.tv_sec > 0) 1482 break; 1483 usleep(1000000 - td.tv_usec); 1484 } 1485 } else { 1486 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1487 if (write(filefd, buf, c) != c) 1488 goto file_err; 1489 (void) alarm(curclass.timeout); 1490 byte_count += c; 1491 total_data_in += c; 1492 total_data += c; 1493 total_bytes_in += c; 1494 total_bytes += c; 1495 } 1496 } 1497 recvdone: 1498 if (c < 0) 1499 goto data_err; 1500 rval = 0; 1501 goto cleanup_recv_data; 1502 1503 case TYPE_E: 1504 reply(553, "TYPE E not implemented."); 1505 goto cleanup_recv_data; 1506 1507 case TYPE_A: 1508 (void) alarm(curclass.timeout); 1509 /* XXXX: rate limit ascii receive (put) */ 1510 while ((c = getc(instr)) != EOF) { 1511 byte_count++; 1512 total_data_in++; 1513 total_data++; 1514 total_bytes_in++; 1515 total_bytes++; 1516 if ((byte_count % 4096) == 0) 1517 (void) alarm(curclass.timeout); 1518 if (c == '\n') 1519 bare_lfs++; 1520 while (c == '\r') { 1521 if (ferror(outstr)) 1522 goto data_err; 1523 if ((c = getc(instr)) != '\n') { 1524 byte_count++; 1525 total_data_in++; 1526 total_data++; 1527 total_bytes_in++; 1528 total_bytes++; 1529 if ((byte_count % 4096) == 0) 1530 (void) alarm(curclass.timeout); 1531 (void) putc ('\r', outstr); 1532 if (c == '\0' || c == EOF) 1533 goto contin2; 1534 } 1535 } 1536 (void) putc(c, outstr); 1537 contin2: ; 1538 } 1539 (void) alarm(0); 1540 fflush(outstr); 1541 if (ferror(instr)) 1542 goto data_err; 1543 if (ferror(outstr)) 1544 goto file_err; 1545 if (bare_lfs) { 1546 lreply(226, 1547 "WARNING! %d bare linefeeds received in ASCII mode", 1548 bare_lfs); 1549 lreply(0, "File may not have transferred correctly."); 1550 } 1551 rval = 0; 1552 goto cleanup_recv_data; 1553 1554 default: 1555 reply(550, "Unimplemented TYPE %d in receive_data", type); 1556 goto cleanup_recv_data; 1557 } 1558 1559 data_err: 1560 (void) alarm(0); 1561 perror_reply(426, "Data Connection"); 1562 goto cleanup_recv_data; 1563 1564 file_err: 1565 (void) alarm(0); 1566 perror_reply(452, "Error writing file"); 1567 goto cleanup_recv_data; 1568 1569 cleanup_recv_data: 1570 (void) alarm(0); 1571 transflag = 0; 1572 total_files_in++; 1573 total_files++; 1574 total_xfers_in++; 1575 total_xfers++; 1576 return (rval); 1577 } 1578 1579 void 1580 statfilecmd(filename) 1581 const char *filename; 1582 { 1583 FILE *fin; 1584 int c; 1585 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1586 1587 argv[2] = (char *)filename; 1588 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1589 lreply(211, "status of %s:", filename); 1590 while ((c = getc(fin)) != EOF) { 1591 if (c == '\n') { 1592 if (ferror(stdout)){ 1593 perror_reply(421, "control connection"); 1594 (void) ftpd_pclose(fin); 1595 dologout(1); 1596 /* NOTREACHED */ 1597 } 1598 if (ferror(fin)) { 1599 perror_reply(551, filename); 1600 (void) ftpd_pclose(fin); 1601 return; 1602 } 1603 (void) putchar('\r'); 1604 total_bytes++; 1605 total_bytes_out++; 1606 } 1607 (void) putchar(c); 1608 total_bytes++; 1609 total_bytes_out++; 1610 } 1611 (void) ftpd_pclose(fin); 1612 reply(211, "End of Status"); 1613 } 1614 1615 void 1616 statcmd() 1617 { 1618 union sockunion *su = NULL; 1619 static char ntop_buf[INET6_ADDRSTRLEN]; 1620 u_char *a, *p; 1621 int ispassive; 1622 off_t b, otbi, otbo, otb; 1623 1624 a = p = (u_char *)NULL; 1625 1626 lreply(211, "%s FTP server status:", hostname); 1627 lreply(0, "%s", version); 1628 ntop_buf[0] = '\0'; 1629 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1630 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1631 && strcmp(remotehost, ntop_buf) != 0) { 1632 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1633 } else 1634 lreply(0, "Connected to %s", remotehost); 1635 if (logged_in) { 1636 if (curclass.type == CLASS_GUEST) 1637 lreply(0, "Logged in anonymously"); 1638 else 1639 lreply(0, "Logged in as %s%s", pw->pw_name, 1640 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1641 } else if (askpasswd) 1642 lreply(0, "Waiting for password"); 1643 else 1644 lreply(0, "Waiting for user name"); 1645 b = printf(" TYPE: %s", typenames[type]); 1646 total_bytes += b; 1647 total_bytes_out += b; 1648 if (type == TYPE_A || type == TYPE_E) { 1649 b = printf(", FORM: %s", formnames[form]); 1650 total_bytes += b; 1651 total_bytes_out += b; 1652 } 1653 if (type == TYPE_L) { 1654 #if NBBY == 8 1655 b = printf(" %d", NBBY); 1656 #else 1657 /* XXX: `bytesize' needs to be defined in this case */ 1658 b = printf(" %d", bytesize); 1659 #endif 1660 total_bytes += b; 1661 total_bytes_out += b; 1662 } 1663 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1664 strunames[stru], modenames[mode]); 1665 total_bytes += b; 1666 total_bytes_out += b; 1667 ispassive = 0; 1668 if (data != -1) { 1669 lreply(0, "Data connection open"); 1670 su = NULL; 1671 } else if (pdata != -1) { 1672 b = printf(" in Passive mode"); 1673 total_bytes += b; 1674 total_bytes_out += b; 1675 su = (union sockunion *)&pasv_addr; 1676 ispassive = 1; 1677 goto printaddr; 1678 } else if (usedefault == 0) { 1679 if (epsvall) { 1680 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1681 total_bytes += b; 1682 total_bytes_out += b; 1683 goto epsvonly; 1684 } 1685 b = printf("211- %s", 1686 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1687 total_bytes += b; 1688 total_bytes_out += b; 1689 su = (union sockunion *)&data_dest; 1690 printaddr: 1691 /* PASV/PORT */ 1692 if (su->su_family == AF_INET) { 1693 if (ispassive) 1694 b = printf("211- PASV "); 1695 else 1696 b = printf("211- PORT "); 1697 a = (u_char *) &su->su_sin.sin_addr; 1698 p = (u_char *) &su->su_sin.sin_port; 1699 #define UC(b) (((int) b) & 0xff) 1700 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1701 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1702 UC(p[0]), UC(p[1])); 1703 total_bytes += b; 1704 total_bytes_out += b; 1705 } 1706 1707 /* LPSV/LPRT */ 1708 { 1709 int alen, af, i; 1710 1711 alen = 0; 1712 switch (su->su_family) { 1713 case AF_INET: 1714 a = (u_char *) &su->su_sin.sin_addr; 1715 p = (u_char *) &su->su_sin.sin_port; 1716 alen = sizeof(su->su_sin.sin_addr); 1717 af = 4; 1718 break; 1719 case AF_INET6: 1720 a = (u_char *) &su->su_sin6.sin6_addr; 1721 p = (u_char *) &su->su_sin6.sin6_port; 1722 alen = sizeof(su->su_sin6.sin6_addr); 1723 af = 6; 1724 break; 1725 default: 1726 af = 0; 1727 break; 1728 } 1729 if (af) { 1730 if (ispassive) 1731 b = printf("211- LPSV "); 1732 else 1733 b = printf("211- LPRT "); 1734 printf("(%d,%d", af, alen); 1735 for (i = 0; i < alen; i++) 1736 b += printf("%d,", UC(a[alen])); 1737 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1738 total_bytes += b; 1739 total_bytes_out += b; 1740 #undef UC 1741 } 1742 } 1743 1744 /* EPRT/EPSV */ 1745 epsvonly:; 1746 { 1747 int af; 1748 1749 switch (su->su_family) { 1750 case AF_INET: 1751 af = 1; 1752 break; 1753 case AF_INET6: 1754 af = 2; 1755 break; 1756 default: 1757 af = 0; 1758 break; 1759 } 1760 if (af) { 1761 if (getnameinfo((struct sockaddr *)su, su->su_len, 1762 ntop_buf, sizeof(ntop_buf), NULL, 0, 1763 NI_NUMERICHOST) == 0) { 1764 if (ispassive) 1765 b = printf("211 - EPSV "); 1766 else 1767 b = printf("211 - EPRT "); 1768 b += printf("(|%d|%s|%d|)\r\n", 1769 af, ntop_buf, ntohs(su->su_port)); 1770 total_bytes += b; 1771 total_bytes_out += b; 1772 } 1773 } 1774 } 1775 } else 1776 lreply(0, "No data connection"); 1777 1778 if (logged_in) { 1779 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1780 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1781 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1782 lreply(0, "Data received: %qd byte%s in %qd file%s", 1783 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1784 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1785 lreply(0, "Total data: %qd byte%s in %qd file%s", 1786 (qdfmt_t)total_data, PLURAL(total_data), 1787 (qdfmt_t)total_files, PLURAL(total_files)); 1788 } 1789 otbi = total_bytes_in; 1790 otbo = total_bytes_out; 1791 otb = total_bytes; 1792 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1793 (qdfmt_t)otbo, PLURAL(otbo), 1794 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1795 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1796 (qdfmt_t)otbi, PLURAL(otbi), 1797 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1798 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1799 (qdfmt_t)otb, PLURAL(otb), 1800 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1801 1802 if (logged_in) { 1803 struct ftpconv *cp; 1804 1805 lreply(0, ""); 1806 lreply(0, "Class: %s, class type: %s", curclass.classname, 1807 curclass.type == CLASS_GUEST ? "GUEST" : 1808 curclass.type == CLASS_CHROOT ? "CHROOT" : 1809 curclass.type == CLASS_REAL ? "REAL" : "<unknown>"); 1810 lreply(0, "Check PORT/LPRT commands: %sabled", 1811 curclass.checkportcmd ? "en" : "dis"); 1812 if (curclass.display != NULL) 1813 lreply(0, "Display file: %s", curclass.display); 1814 if (curclass.notify != NULL) 1815 lreply(0, "Notify fileglob: %s", curclass.notify); 1816 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1817 curclass.timeout, curclass.maxtimeout); 1818 if (curclass.motd != NULL) 1819 lreply(0, "MotD file: %s", curclass.motd); 1820 lreply(0, 1821 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1822 curclass.modify ? "en" : "dis"); 1823 lreply(0, 1824 "Upload commands (APPE, STOR, STOU): %sabled", 1825 curclass.upload ? "en" : "dis"); 1826 if (curclass.rateget) 1827 lreply(0, "Rate get limit: %d bytes/sec", 1828 curclass.rateget); 1829 else 1830 lreply(0, "Rate get limit: disabled"); 1831 if (curclass.rateput) 1832 lreply(0, "Rate put limit: %d bytes/sec", 1833 curclass.rateput); 1834 else 1835 lreply(0, "Rate put limit: disabled"); 1836 lreply(0, "Umask: %.04o", curclass.umask); 1837 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1838 if (cp->suffix == NULL || cp->types == NULL || 1839 cp->command == NULL) 1840 continue; 1841 lreply(0, 1842 "Conversion: %s [%s] disable: %s, command: %s", 1843 cp->suffix, cp->types, cp->disable, cp->command); 1844 } 1845 } 1846 1847 reply(211, "End of status"); 1848 } 1849 1850 void 1851 fatal(s) 1852 const char *s; 1853 { 1854 1855 reply(451, "Error in server: %s\n", s); 1856 reply(221, "Closing connection due to server error."); 1857 dologout(0); 1858 /* NOTREACHED */ 1859 } 1860 1861 void 1862 #ifdef __STDC__ 1863 reply(int n, const char *fmt, ...) 1864 #else 1865 reply(n, fmt, va_alist) 1866 int n; 1867 char *fmt; 1868 va_dcl 1869 #endif 1870 { 1871 off_t b; 1872 va_list ap; 1873 #ifdef __STDC__ 1874 va_start(ap, fmt); 1875 #else 1876 va_start(ap); 1877 #endif 1878 b = 0; 1879 b += printf("%d ", n); 1880 b += vprintf(fmt, ap); 1881 b += printf("\r\n"); 1882 total_bytes += b; 1883 total_bytes_out += b; 1884 (void)fflush(stdout); 1885 if (debug) { 1886 syslog(LOG_DEBUG, "<--- %d ", n); 1887 vsyslog(LOG_DEBUG, fmt, ap); 1888 } 1889 } 1890 1891 void 1892 #ifdef __STDC__ 1893 lreply(int n, const char *fmt, ...) 1894 #else 1895 lreply(n, fmt, va_alist) 1896 int n; 1897 char *fmt; 1898 va_dcl 1899 #endif 1900 { 1901 off_t b; 1902 va_list ap; 1903 #ifdef __STDC__ 1904 va_start(ap, fmt); 1905 #else 1906 va_start(ap); 1907 #endif 1908 b = 0; 1909 switch (n) { 1910 case 0: 1911 b += printf(" "); 1912 case -1: 1913 break; 1914 default: 1915 b += printf("%d-", n); 1916 break; 1917 } 1918 b += vprintf(fmt, ap); 1919 b += printf("\r\n"); 1920 total_bytes += b; 1921 total_bytes_out += b; 1922 (void)fflush(stdout); 1923 if (debug) { 1924 syslog(LOG_DEBUG, "<--- %d- ", n); 1925 vsyslog(LOG_DEBUG, fmt, ap); 1926 } 1927 } 1928 1929 static void 1930 ack(s) 1931 const char *s; 1932 { 1933 1934 reply(250, "%s command successful.", s); 1935 } 1936 1937 void 1938 delete(name) 1939 const char *name; 1940 { 1941 char *p = NULL; 1942 1943 if (remove(name) < 0) { 1944 p = strerror(errno); 1945 perror_reply(550, name); 1946 } else 1947 ack("DELE"); 1948 logcmd("delete", -1, name, NULL, NULL, p); 1949 } 1950 1951 void 1952 cwd(path) 1953 const char *path; 1954 { 1955 1956 if (chdir(path) < 0) 1957 perror_reply(550, path); 1958 else { 1959 show_chdir_messages(250); 1960 ack("CWD"); 1961 } 1962 } 1963 1964 static void 1965 replydirname(name, message) 1966 const char *name, *message; 1967 { 1968 char npath[MAXPATHLEN + 1]; 1969 int i; 1970 1971 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1972 npath[i] = *name; 1973 if (*name == '"') 1974 npath[++i] = '"'; 1975 } 1976 npath[i] = '\0'; 1977 reply(257, "\"%s\" %s", npath, message); 1978 } 1979 1980 void 1981 makedir(name) 1982 const char *name; 1983 { 1984 char *p = NULL; 1985 1986 if (mkdir(name, 0777) < 0) { 1987 p = strerror(errno); 1988 perror_reply(550, name); 1989 } else 1990 replydirname(name, "directory created."); 1991 logcmd("mkdir", -1, name, NULL, NULL, p); 1992 } 1993 1994 void 1995 removedir(name) 1996 const char *name; 1997 { 1998 char *p = NULL; 1999 2000 if (rmdir(name) < 0) { 2001 p = strerror(errno); 2002 perror_reply(550, name); 2003 } else 2004 ack("RMD"); 2005 logcmd("rmdir", -1, name, NULL, NULL, p); 2006 } 2007 2008 void 2009 pwd() 2010 { 2011 char path[MAXPATHLEN + 1]; 2012 2013 if (getcwd(path, sizeof(path) - 1) == NULL) 2014 reply(550, "Can't get the current directory: %s.", 2015 strerror(errno)); 2016 else 2017 replydirname(path, "is the current directory."); 2018 } 2019 2020 char * 2021 renamefrom(name) 2022 char *name; 2023 { 2024 struct stat st; 2025 2026 if (stat(name, &st) < 0) { 2027 perror_reply(550, name); 2028 return (NULL); 2029 } 2030 reply(350, "File exists, ready for destination name"); 2031 return (name); 2032 } 2033 2034 void 2035 renamecmd(from, to) 2036 const char *from, *to; 2037 { 2038 char *p = NULL; 2039 2040 if (rename(from, to) < 0) { 2041 p = strerror(errno); 2042 perror_reply(550, "rename"); 2043 } else 2044 ack("RNTO"); 2045 logcmd("rename", -1, from, to, NULL, p); 2046 } 2047 2048 static void 2049 dolog(who) 2050 struct sockaddr *who; 2051 { 2052 int error; 2053 error = getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), 2054 NULL, 0, 0); 2055 #ifdef HASSETPROCTITLE 2056 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2057 setproctitle(proctitle); 2058 #endif /* HASSETPROCTITLE */ 2059 2060 if (logging) 2061 syslog(LOG_INFO, "connection from %s", remotehost); 2062 } 2063 2064 /* 2065 * Record logout in wtmp file 2066 * and exit with supplied status. 2067 */ 2068 void 2069 dologout(status) 2070 int status; 2071 { 2072 /* 2073 * Prevent reception of SIGURG from resulting in a resumption 2074 * back to the main program loop. 2075 */ 2076 transflag = 0; 2077 2078 if (logged_in) { 2079 (void) seteuid((uid_t)0); 2080 logwtmp(ttyline, "", ""); 2081 #ifdef KERBEROS 2082 if (!notickets && krbtkfile_env) 2083 unlink(krbtkfile_env); 2084 #endif 2085 } 2086 /* beware of flushing buffers after a SIGPIPE */ 2087 _exit(status); 2088 } 2089 2090 static void 2091 myoob(signo) 2092 int signo; 2093 { 2094 char *cp; 2095 2096 /* only process if transfer occurring */ 2097 if (!transflag) 2098 return; 2099 cp = tmpline; 2100 if (getline(cp, 7, stdin) == NULL) { 2101 reply(221, "You could at least say goodbye."); 2102 dologout(0); 2103 } 2104 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2105 tmpline[0] = '\0'; 2106 reply(426, "Transfer aborted. Data connection closed."); 2107 reply(226, "Abort successful"); 2108 longjmp(urgcatch, 1); 2109 } 2110 if (strcasecmp(cp, "STAT\r\n") == 0) { 2111 if (file_size != (off_t) -1) 2112 reply(213, "Status: %qd of %qd byte%s transferred", 2113 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2114 PLURAL(byte_count)); 2115 else 2116 reply(213, "Status: %qd byte%s transferred", 2117 (qdfmt_t)byte_count, PLURAL(byte_count)); 2118 } 2119 } 2120 2121 /* 2122 * Note: a response of 425 is not mentioned as a possible response to 2123 * the PASV command in RFC959. However, it has been blessed as 2124 * a legitimate response by Jon Postel in a telephone conversation 2125 * with Rick Adams on 25 Jan 89. 2126 */ 2127 void 2128 passive() 2129 { 2130 int len; 2131 char *p, *a; 2132 2133 if (pdata >= 0) 2134 close(pdata); 2135 pdata = socket(AF_INET, SOCK_STREAM, 0); 2136 if (pdata < 0 || !logged_in) { 2137 perror_reply(425, "Can't open passive connection"); 2138 return; 2139 } 2140 pasv_addr = ctrl_addr; 2141 pasv_addr.su_port = 0; 2142 len = pasv_addr.su_len; 2143 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) { 2144 goto pasv_error; 2145 } 2146 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2147 goto pasv_error; 2148 if (listen(pdata, 1) < 0) 2149 goto pasv_error; 2150 a = (char *) &pasv_addr.su_sin.sin_addr; 2151 p = (char *) &pasv_addr.su_port; 2152 2153 #define UC(b) (((int) b) & 0xff) 2154 2155 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2156 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2157 return; 2158 2159 pasv_error: 2160 (void) close(pdata); 2161 pdata = -1; 2162 perror_reply(425, "Can't open passive connection"); 2163 return; 2164 } 2165 2166 /* 2167 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2168 * 229 Entering Extended Passive Mode (|||port|) 2169 */ 2170 void 2171 long_passive(char *cmd, int pf) 2172 { 2173 int len; 2174 register char *p, *a; 2175 2176 if (!logged_in) { 2177 syslog(LOG_NOTICE, "long passive but not logged in"); 2178 reply(503, "Login with USER first."); 2179 return; 2180 } 2181 2182 if (pf != PF_UNSPEC) { 2183 if (ctrl_addr.su_family != pf) { 2184 switch (ctrl_addr.su_family) { 2185 case AF_INET: 2186 pf = 1; 2187 break; 2188 case AF_INET6: 2189 pf = 2; 2190 break; 2191 default: 2192 pf = 0; 2193 break; 2194 } 2195 /* 2196 * XXX 2197 * only EPRT/EPSV ready clients will understand this 2198 */ 2199 if (strcmp(cmd, "EPSV") == 0 && pf) { 2200 reply(522, "Network protocol mismatch, " 2201 "use (%d)", pf); 2202 } else 2203 reply(501, "Network protocol mismatch"); /*XXX*/ 2204 2205 return; 2206 } 2207 } 2208 2209 if (pdata >= 0) 2210 close(pdata); 2211 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2212 if (pdata < 0) { 2213 perror_reply(425, "Can't open passive connection"); 2214 return; 2215 } 2216 pasv_addr = ctrl_addr; 2217 pasv_addr.su_port = 0; 2218 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2219 goto pasv_error; 2220 } 2221 len = pasv_addr.su_len; 2222 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2223 goto pasv_error; 2224 if (listen(pdata, 1) < 0) 2225 goto pasv_error; 2226 p = (char *) &pasv_addr.su_port; 2227 2228 #define UC(b) (((int) b) & 0xff) 2229 2230 if (strcmp(cmd, "LPSV") == 0) { 2231 switch (pasv_addr.su_family) { 2232 case AF_INET: 2233 a = (char *) &pasv_addr.su_sin.sin_addr; 2234 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2235 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2236 2, UC(p[0]), UC(p[1])); 2237 return; 2238 case AF_INET6: 2239 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2240 reply(228, "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)", 2241 6, 16, 2242 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2243 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2244 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2245 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2246 2, UC(p[0]), UC(p[1])); 2247 return; 2248 } 2249 #undef UC 2250 } else if (strcmp(cmd, "EPSV") == 0) { 2251 switch (pasv_addr.su_family) { 2252 case AF_INET: 2253 case AF_INET6: 2254 reply(229, "Entering Extended Passive Mode (|||%d|)", 2255 ntohs(pasv_addr.su_port)); 2256 return; 2257 } 2258 } else { 2259 /* more proper error code? */ 2260 } 2261 2262 pasv_error: 2263 (void) close(pdata); 2264 pdata = -1; 2265 perror_reply(425, "Can't open passive connection"); 2266 return; 2267 } 2268 2269 /* 2270 * Generate unique name for file with basename "local". 2271 * The file named "local" is already known to exist. 2272 * Generates failure reply on error. 2273 * 2274 * XXX this function should under go changes similar to 2275 * the mktemp(3)/mkstemp(3) changes. 2276 */ 2277 static char * 2278 gunique(local) 2279 const char *local; 2280 { 2281 static char new[MAXPATHLEN + 1]; 2282 struct stat st; 2283 char *cp; 2284 int count; 2285 2286 cp = strrchr(local, '/'); 2287 if (cp) 2288 *cp = '\0'; 2289 if (stat(cp ? local : ".", &st) < 0) { 2290 perror_reply(553, cp ? local : "."); 2291 return (NULL); 2292 } 2293 if (cp) 2294 *cp = '/'; 2295 for (count = 1; count < 100; count++) { 2296 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2297 if (stat(new, &st) < 0) 2298 return (new); 2299 } 2300 reply(452, "Unique file name cannot be created."); 2301 return (NULL); 2302 } 2303 2304 /* 2305 * Format and send reply containing system error number. 2306 */ 2307 void 2308 perror_reply(code, string) 2309 int code; 2310 const char *string; 2311 { 2312 int save_errno; 2313 2314 save_errno = errno; 2315 reply(code, "%s: %s.", string, strerror(errno)); 2316 errno = save_errno; 2317 } 2318 2319 static char *onefile[] = { 2320 "", 2321 0 2322 }; 2323 2324 void 2325 send_file_list(whichf) 2326 const char *whichf; 2327 { 2328 struct stat st; 2329 DIR *dirp = NULL; 2330 struct dirent *dir; 2331 FILE *dout = NULL; 2332 char **dirlist, *dirname, *p; 2333 int simple = 0; 2334 int freeglob = 0; 2335 glob_t gl; 2336 off_t b; 2337 2338 #ifdef __GNUC__ 2339 (void) &dout; 2340 (void) &dirlist; 2341 (void) &simple; 2342 (void) &freeglob; 2343 #endif 2344 2345 p = NULL; 2346 if (strpbrk(whichf, "~{[*?") != NULL) { 2347 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2348 2349 memset(&gl, 0, sizeof(gl)); 2350 freeglob = 1; 2351 if (glob(whichf, flags, 0, &gl)) { 2352 reply(550, "not found"); 2353 goto out; 2354 } else if (gl.gl_pathc == 0) { 2355 errno = ENOENT; 2356 perror_reply(550, whichf); 2357 goto out; 2358 } 2359 dirlist = gl.gl_pathv; 2360 } else { 2361 p = xstrdup(whichf); 2362 onefile[0] = p; 2363 dirlist = onefile; 2364 simple = 1; 2365 } 2366 /* XXX: } for vi sm */ 2367 2368 if (setjmp(urgcatch)) { 2369 transflag = 0; 2370 goto out; 2371 } 2372 while ((dirname = *dirlist++) != NULL) { 2373 int trailingslash = 0; 2374 2375 if (stat(dirname, &st) < 0) { 2376 /* 2377 * If user typed "ls -l", etc, and the client 2378 * used NLST, do what the user meant. 2379 */ 2380 /* XXX: nuke this support? */ 2381 if (dirname[0] == '-' && *dirlist == NULL && 2382 transflag == 0) { 2383 char *argv[] = { INTERNAL_LS, "", NULL }; 2384 2385 argv[1] = dirname; 2386 retrieve(argv, dirname); 2387 goto out; 2388 } 2389 perror_reply(550, whichf); 2390 if (dout != NULL) { 2391 (void) fclose(dout); 2392 transflag = 0; 2393 data = -1; 2394 pdata = -1; 2395 } 2396 goto out; 2397 } 2398 2399 if (S_ISREG(st.st_mode)) { 2400 if (dout == NULL) { 2401 dout = dataconn("file list", (off_t)-1, "w"); 2402 if (dout == NULL) 2403 goto out; 2404 transflag++; 2405 } 2406 b = fprintf(dout, "%s%s\n", dirname, 2407 type == TYPE_A ? "\r" : ""); 2408 total_bytes += b; 2409 total_bytes_out += b; 2410 byte_count += strlen(dirname) + 1; 2411 continue; 2412 } else if (!S_ISDIR(st.st_mode)) 2413 continue; 2414 2415 if (dirname[strlen(dirname) - 1] == '/') 2416 trailingslash++; 2417 2418 if ((dirp = opendir(dirname)) == NULL) 2419 continue; 2420 2421 while ((dir = readdir(dirp)) != NULL) { 2422 char nbuf[MAXPATHLEN + 1]; 2423 2424 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2425 continue; 2426 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2427 dir->d_namlen == 2) 2428 continue; 2429 2430 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2431 trailingslash ? "" : "/", dir->d_name); 2432 2433 /* 2434 * We have to do a stat to ensure it's 2435 * not a directory or special file. 2436 */ 2437 /* XXX: follow RFC959 and filter out non files ? */ 2438 if (simple || (stat(nbuf, &st) == 0 && 2439 S_ISREG(st.st_mode))) { 2440 char *p; 2441 2442 if (dout == NULL) { 2443 dout = dataconn("file list", (off_t)-1, 2444 "w"); 2445 if (dout == NULL) 2446 goto out; 2447 transflag++; 2448 } 2449 p = nbuf; 2450 if (nbuf[0] == '.' && nbuf[1] == '/') 2451 p = &nbuf[2]; 2452 b = fprintf(dout, "%s%s\n", p, 2453 type == TYPE_A ? "\r" : ""); 2454 total_bytes += b; 2455 total_bytes_out += b; 2456 byte_count += strlen(nbuf) + 1; 2457 } 2458 } 2459 (void) closedir(dirp); 2460 } 2461 2462 if (dout == NULL) 2463 reply(550, "No files found."); 2464 else if (ferror(dout) != 0) 2465 perror_reply(550, "Data connection"); 2466 else 2467 reply(226, "Transfer complete."); 2468 2469 transflag = 0; 2470 if (dout != NULL) 2471 (void) fclose(dout); 2472 data = -1; 2473 pdata = -1; 2474 out: 2475 total_xfers++; 2476 total_xfers_out++; 2477 if (p) 2478 free(p); 2479 if (freeglob) 2480 globfree(&gl); 2481 } 2482 2483 char * 2484 conffilename(s) 2485 const char *s; 2486 { 2487 static char filename[MAXPATHLEN + 1]; 2488 2489 if (*s == '/') 2490 strlcpy(filename, s, sizeof(filename)); 2491 else 2492 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2493 return (filename); 2494 } 2495 2496 /* 2497 * logcmd -- 2498 * based on the arguments, syslog a message: 2499 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2500 * else if file2 != NULL "<command> <file1> <file2>" 2501 * else "<command> <file1>" 2502 * if elapsed != NULL, append "in xxx.yyy seconds" 2503 * if error != NULL, append ": " + error 2504 */ 2505 2506 void 2507 logcmd(command, bytes, file1, file2, elapsed, error) 2508 const char *command; 2509 off_t bytes; 2510 const char *file1; 2511 const char *file2; 2512 const struct timeval *elapsed; 2513 const char *error; 2514 { 2515 char buf[MAXPATHLEN + 100], realfile[MAXPATHLEN + 1]; 2516 const char *p; 2517 size_t len; 2518 2519 if (logging <=1) 2520 return; 2521 2522 if ((p = realpath(file1, realfile)) == NULL) { 2523 #if 0 /* XXX: too noisy */ 2524 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2525 realfile, strerror(errno)); 2526 #endif 2527 p = file1; 2528 } 2529 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2530 2531 if (bytes != (off_t)-1) { 2532 len += snprintf(buf + len, sizeof(buf) - len, 2533 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2534 } else if (file2 != NULL) { 2535 if ((p = realpath(file2, realfile)) == NULL) { 2536 #if 0 /* XXX: too noisy */ 2537 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2538 realfile, strerror(errno)); 2539 #endif 2540 p = file2; 2541 } 2542 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2543 } 2544 2545 if (elapsed != NULL) { 2546 len += snprintf(buf + len, sizeof(buf) - len, 2547 " in %ld.%.03d seconds", elapsed->tv_sec, 2548 (int)(elapsed->tv_usec / 1000)); 2549 } 2550 2551 if (error != NULL) 2552 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2553 2554 syslog(LOG_INFO, "%s", buf); 2555 } 2556 2557 char * 2558 xstrdup(s) 2559 const char *s; 2560 { 2561 char *new = strdup(s); 2562 2563 if (new == NULL) 2564 fatal("Local resource failure: malloc"); 2565 /* NOTREACHED */ 2566 return (new); 2567 } 2568
Indexes created Wed Sep 24 15:09:51 GMT 2025