ftpd.c revision 1.58
1 /* $NetBSD: ftpd.c,v 1.58 1998/09/07 08:11:20 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 46 #else 47 __RCSID("$NetBSD: ftpd.c,v 1.58 1998/09/07 08:11:20 lukem Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/socket.h> 58 #include <sys/wait.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 64 #define FTP_NAMES 65 #include <arpa/ftp.h> 66 #include <arpa/inet.h> 67 #include <arpa/telnet.h> 68 69 #include <ctype.h> 70 #include <dirent.h> 71 #include <err.h> 72 #include <errno.h> 73 #include <fcntl.h> 74 #include <fnmatch.h> 75 #include <glob.h> 76 #include <limits.h> 77 #include <netdb.h> 78 #include <pwd.h> 79 #include <setjmp.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <syslog.h> 85 #include <time.h> 86 #include <unistd.h> 87 #ifdef SKEY 88 #include <skey.h> 89 #endif 90 #ifdef KERBEROS5 91 #include <krb5.h> 92 #endif 93 94 #include "extern.h" 95 #include "pathnames.h" 96 97 #if __STDC__ 98 #include <stdarg.h> 99 #else 100 #include <varargs.h> 101 #endif 102 103 #ifndef TRUE 104 #define TRUE 1 105 #define FALSE 0 106 #endif 107 108 const char version[] = "Version: 7.03"; 109 110 struct sockaddr_in ctrl_addr; 111 struct sockaddr_in data_source; 112 struct sockaddr_in data_dest; 113 struct sockaddr_in his_addr; 114 struct sockaddr_in pasv_addr; 115 116 int data; 117 jmp_buf errcatch, urgcatch; 118 int logged_in; 119 struct passwd *pw; 120 int debug; 121 int sflag; 122 int logging; 123 int guest; 124 int dochroot; 125 int type; 126 int form; 127 int stru; /* avoid C keyword */ 128 int mode; 129 int usedefault = 1; /* for data transfers */ 130 int pdata = -1; /* for passive mode */ 131 sig_atomic_t transflag; 132 off_t file_size; 133 off_t byte_count; 134 char tmpline[7]; 135 char hostname[MAXHOSTNAMELEN+1]; 136 char remotehost[MAXHOSTNAMELEN+1]; 137 static char ttyline[20]; 138 char *tty = ttyline; /* for klogin */ 139 140 static char *anondir = NULL; 141 static char confdir[MAXPATHLEN]; 142 143 #if defined(KERBEROS) || defined(KERBEROS5) 144 int notickets = 1; 145 char *krbtkfile_env = NULL; 146 #endif 147 148 /* 149 * Timeout intervals for retrying connections 150 * to hosts that don't accept PORT cmds. This 151 * is a kludge, but given the problems with TCP... 152 */ 153 #define SWAITMAX 90 /* wait at most 90 seconds */ 154 #define SWAITINT 5 /* interval between retries */ 155 156 int swaitmax = SWAITMAX; 157 int swaitint = SWAITINT; 158 159 #ifdef HASSETPROCTITLE 160 char proctitle[BUFSIZ]; /* initial part of title */ 161 #endif /* HASSETPROCTITLE */ 162 163 #define LOGCMD(cmd, file) \ 164 if (logging > 1) \ 165 syslog(LOG_INFO,"%s %s%s", cmd, \ 166 *(file) == '/' ? "" : curdir(), file); 167 #define LOGCMD2(cmd, file1, file2) \ 168 if (logging > 1) \ 169 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 170 *(file1) == '/' ? "" : curdir(), file1, \ 171 *(file2) == '/' ? "" : curdir(), file2); 172 #define LOGBYTES(cmd, file, cnt) \ 173 if (logging > 1) { \ 174 if (cnt == (off_t)-1) \ 175 syslog(LOG_INFO,"%s %s%s", cmd, \ 176 *(file) == '/' ? "" : curdir(), file); \ 177 else \ 178 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 179 cmd, (*(file) == '/') ? "" : curdir(), file, \ 180 (long long)cnt); \ 181 } 182 183 static void ack __P((char *)); 184 static void myoob __P((int)); 185 static int checkuser __P((const char *, const char *, int, int)); 186 static int checkaccess __P((const char *)); 187 static FILE *dataconn __P((char *, off_t, char *)); 188 static void dolog __P((struct sockaddr_in *)); 189 static char *curdir __P((void)); 190 static void end_login __P((void)); 191 static FILE *getdatasock __P((char *)); 192 static char *gunique __P((char *)); 193 static void lostconn __P((int)); 194 static int receive_data __P((FILE *, FILE *)); 195 static void replydirname __P((const char *, const char *)); 196 static int send_data __P((FILE *, FILE *, off_t)); 197 static struct passwd * 198 sgetpwnam __P((const char *)); 199 200 int main __P((int, char *[])); 201 202 #if defined(KERBEROS) || defined(KERBEROS5) 203 int klogin __P((struct passwd *, char *, char *, char *)); 204 void kdestroy __P((void)); 205 #endif 206 207 static char * 208 curdir() 209 { 210 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 211 212 if (getcwd(path, sizeof(path)-2) == NULL) 213 return (""); 214 if (path[1] != '\0') /* special case for root dir. */ 215 strcat(path, "/"); 216 /* For guest account, skip / since it's chrooted */ 217 return (guest ? path+1 : path); 218 } 219 220 int 221 main(argc, argv) 222 int argc; 223 char *argv[]; 224 { 225 int addrlen, ch, on = 1, tos; 226 char *cp, line[LINE_MAX]; 227 FILE *fd; 228 #ifdef KERBEROS5 229 krb5_error_code kerror; 230 #endif 231 232 debug = 0; 233 logging = 0; 234 sflag = 0; 235 (void)strcpy(confdir, _DEFAULT_CONFDIR); 236 237 while ((ch = getopt(argc, argv, "a:c:C:dlst:T:u:v")) != -1) { 238 switch (ch) { 239 case 'a': 240 anondir = optarg; 241 break; 242 243 case 'c': 244 (void)strncpy(confdir, optarg, sizeof(confdir)); 245 confdir[sizeof(confdir)-1] = '\0'; 246 break; 247 248 case 'C': 249 exit(checkaccess(optarg)); 250 /* NOTREACHED */ 251 252 case 'd': 253 case 'v': /* deprecated */ 254 debug = 1; 255 break; 256 257 case 'l': 258 logging++; /* > 1 == extra logging */ 259 break; 260 261 case 's': 262 sflag = 1; 263 break; 264 265 case 't': 266 case 'T': 267 case 'u': 268 warnx("-%c has been deprecated in favour of ftpd.conf", 269 ch); 270 break; 271 272 default: 273 if (optopt == 'a' || optopt == 'C') 274 exit(1); 275 warnx("unknown flag -%c ignored", optopt); 276 break; 277 } 278 } 279 280 /* 281 * LOG_NDELAY sets up the logging connection immediately, 282 * necessary for anonymous ftp's that chroot and can't do it later. 283 */ 284 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 285 addrlen = sizeof(his_addr); 286 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 287 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 288 exit(1); 289 } 290 addrlen = sizeof(ctrl_addr); 291 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 292 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 293 exit(1); 294 } 295 #ifdef IP_TOS 296 tos = IPTOS_LOWDELAY; 297 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 298 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 299 #endif 300 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 301 302 /* set this here so klogin can use it... */ 303 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 304 305 (void) freopen(_PATH_DEVNULL, "w", stderr); 306 (void) signal(SIGPIPE, lostconn); 307 (void) signal(SIGCHLD, SIG_IGN); 308 if ((long)signal(SIGURG, myoob) < 0) 309 syslog(LOG_ERR, "signal: %m"); 310 311 /* Try to handle urgent data inline */ 312 #ifdef SO_OOBINLINE 313 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 314 syslog(LOG_ERR, "setsockopt: %m"); 315 #endif 316 317 #ifdef F_SETOWN 318 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 319 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 320 #endif 321 dolog(&his_addr); 322 /* 323 * Set up default state 324 */ 325 data = -1; 326 type = TYPE_A; 327 form = FORM_N; 328 stru = STRU_F; 329 mode = MODE_S; 330 tmpline[0] = '\0'; 331 hasyyerrored = 0; 332 333 #ifdef KERBEROS5 334 kerror = krb5_init_context(&kcontext); 335 if (kerror) { 336 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 337 error_message(kerror)); 338 exit(0); 339 } 340 #endif /* KERBEROS5 */ 341 342 /* If logins are disabled, print out the message. */ 343 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 344 while (fgets(line, sizeof(line), fd) != NULL) { 345 if ((cp = strchr(line, '\n')) != NULL) 346 *cp = '\0'; 347 lreply(530, "%s", line); 348 } 349 (void) fflush(stdout); 350 (void) fclose(fd); 351 reply(530, "System not available."); 352 exit(0); 353 } 354 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 355 while (fgets(line, sizeof(line), fd) != NULL) { 356 if ((cp = strchr(line, '\n')) != NULL) 357 *cp = '\0'; 358 lreply(220, "%s", line); 359 } 360 (void) fflush(stdout); 361 (void) fclose(fd); 362 /* reply(220,) must follow */ 363 } 364 (void)gethostname(hostname, sizeof(hostname)); 365 hostname[sizeof(hostname) - 1] = '\0'; 366 reply(220, "%s FTP server (%s) ready.", hostname, version); 367 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 368 (void) setjmp(errcatch); 369 for (;;) 370 (void) yyparse(); 371 /* NOTREACHED */ 372 } 373 374 static void 375 lostconn(signo) 376 int signo; 377 { 378 379 if (debug) 380 syslog(LOG_DEBUG, "lost connection"); 381 dologout(1); 382 } 383 384 /* 385 * Save the result of a getpwnam. Used for USER command, since 386 * the data returned must not be clobbered by any other command 387 * (e.g., globbing). 388 */ 389 static struct passwd * 390 sgetpwnam(name) 391 const char *name; 392 { 393 static struct passwd save; 394 struct passwd *p; 395 396 if ((p = getpwnam(name)) == NULL) 397 return (p); 398 if (save.pw_name) { 399 free((char *)save.pw_name); 400 free((char *)save.pw_passwd); 401 free((char *)save.pw_gecos); 402 free((char *)save.pw_dir); 403 free((char *)save.pw_shell); 404 } 405 save = *p; 406 save.pw_name = xstrdup(p->pw_name); 407 save.pw_passwd = xstrdup(p->pw_passwd); 408 save.pw_gecos = xstrdup(p->pw_gecos); 409 save.pw_dir = xstrdup(p->pw_dir); 410 save.pw_shell = xstrdup(p->pw_shell); 411 return (&save); 412 } 413 414 static int login_attempts; /* number of failed login attempts */ 415 static int askpasswd; /* had user command, ask for passwd */ 416 static char curname[10]; /* current USER name */ 417 418 /* 419 * USER command. 420 * Sets global passwd pointer pw if named account exists and is acceptable; 421 * sets askpasswd if a PASS command is expected. If logged in previously, 422 * need to reset state. If name is "ftp" or "anonymous", the name is not in 423 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 424 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 425 * requesting login privileges. Disallow anyone who does not have a standard 426 * shell as returned by getusershell(). Disallow anyone mentioned in the file 427 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 428 */ 429 void 430 user(name) 431 char *name; 432 { 433 if (logged_in) { 434 if (guest) { 435 reply(530, "Can't change user from guest login."); 436 return; 437 } else if (dochroot) { 438 reply(530, "Can't change user from chroot user."); 439 return; 440 } 441 end_login(); 442 } 443 444 #if defined(KERBEROS) || defined(KERBEROS5) 445 kdestroy(); 446 #endif 447 448 guest = 0; 449 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 450 if (checkaccess("ftp") || checkaccess("anonymous")) 451 reply(530, "User %s access denied.", name); 452 else if ((pw = sgetpwnam("ftp")) != NULL) { 453 guest = 1; 454 askpasswd = 1; 455 reply(331, 456 "Guest login ok, type your name as password."); 457 } else 458 reply(530, "User %s unknown.", name); 459 if (!askpasswd && logging) 460 syslog(LOG_NOTICE, 461 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 462 return; 463 } 464 465 pw = sgetpwnam(name); 466 if (logging) 467 strncpy(curname, name, sizeof(curname)-1); 468 469 #ifdef SKEY 470 if (skey_haskey(name) == 0) { 471 char *myskey; 472 473 myskey = skey_keyinfo(name); 474 reply(331, "Password [%s] required for %s.", 475 myskey ? myskey : "error getting challenge", name); 476 } else 477 #endif 478 reply(331, "Password required for %s.", name); 479 480 askpasswd = 1; 481 /* 482 * Delay before reading passwd after first failed 483 * attempt to slow down passwd-guessing programs. 484 */ 485 if (login_attempts) 486 sleep((unsigned) login_attempts); 487 } 488 489 /* 490 * Determine whether something is to happen (allow access, chroot) 491 * for a user. Each line is a shell-style glob followed by 492 * `yes' or `no'. 493 * 494 * For backward compatability, `allow' and `deny' are synonymns 495 * for `yes' and `no', respectively. 496 * 497 * Each glob is matched against the username in turn, and the first 498 * match found is used. If no match is found, the result is the 499 * argument `def'. If a match is found but without and explicit 500 * `yes'/`no', the result is the opposite of def. 501 * 502 * If the file doesn't exist at all, the result is the argument 503 * `nofile' 504 * 505 * Any line starting with `#' is considered a comment and ignored. 506 * 507 * Returns FALSE if the user is denied, or TRUE if they are allowed. 508 */ 509 int 510 checkuser(fname, name, def, nofile) 511 const char *fname, *name; 512 int def, nofile; 513 { 514 FILE *fd; 515 int retval; 516 char *glob, *perm, line[BUFSIZ]; 517 518 retval = def; 519 if ((fd = fopen(conffilename(fname), "r")) == NULL) 520 return nofile; 521 522 while (fgets(line, sizeof(line), fd) != NULL) { 523 glob = strtok(line, " \t\n"); 524 if (glob[0] == '#') 525 continue; 526 perm = strtok(NULL, " \t\n"); 527 if (fnmatch(glob, name, 0) == 0) { 528 if (perm != NULL && 529 ((strcasecmp(perm, "allow") == 0) || 530 (strcasecmp(perm, "yes") == 0))) 531 retval = TRUE; 532 else if (perm != NULL && 533 ((strcasecmp(perm, "deny") == 0) || 534 (strcasecmp(perm, "no") == 0))) 535 retval = FALSE; 536 else 537 retval = !def; 538 break; 539 } 540 } 541 (void) fclose(fd); 542 return (retval); 543 } 544 545 /* 546 * Check if user is allowed by /etc/ftpusers 547 * returns 0 for yes, 1 for no 548 */ 549 int 550 checkaccess(name) 551 const char *name; 552 { 553 554 return (! checkuser(_PATH_FTPUSERS, name, TRUE, FALSE)); 555 } 556 557 /* 558 * Terminate login as previous user, if any, resetting state; 559 * used when USER command is given or login fails. 560 */ 561 static void 562 end_login() 563 { 564 565 (void) seteuid((uid_t)0); 566 if (logged_in) 567 logwtmp(ttyline, "", ""); 568 pw = NULL; 569 logged_in = 0; 570 guest = 0; 571 dochroot = 0; 572 } 573 574 void 575 pass(passwd) 576 char *passwd; 577 { 578 int rval; 579 FILE *fd; 580 char const *cp, *shell, *home; 581 582 if (logged_in || askpasswd == 0) { 583 reply(503, "Login with USER first."); 584 return; 585 } 586 askpasswd = 0; 587 if (!guest) { /* "ftp" is only account allowed no password */ 588 if (pw == NULL) { 589 rval = 1; /* failure below */ 590 goto skip; 591 } 592 #ifdef KERBEROS 593 if (klogin(pw, "", hostname, passwd) == 0) { 594 rval = 0; 595 goto skip; 596 } 597 #endif 598 #ifdef KERBEROS5 599 if (klogin(pw, "", hostname, passwd) == 0) { 600 rval = 0; 601 goto skip; 602 } 603 #endif 604 #ifdef SKEY 605 if (skey_haskey(pw->pw_name) == 0 && 606 skey_passcheck(pw->pw_name, passwd) != -1) { 607 rval = 0; 608 goto skip; 609 } 610 #endif 611 if (!sflag && *pw->pw_passwd != '\0' && 612 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 613 rval = 0; 614 goto skip; 615 } 616 rval = 1; 617 618 skip: 619 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 620 rval = 2; 621 /* 622 * If rval > 0, the user failed the authentication check 623 * above. If rval == 0, either Kerberos or local authentication 624 * succeeded. 625 */ 626 if (rval) { 627 reply(530, rval == 2 ? "Password expired." : 628 "Login incorrect."); 629 if (logging) { 630 syslog(LOG_NOTICE, 631 "FTP LOGIN FAILED FROM %s", remotehost); 632 syslog(LOG_AUTHPRIV | LOG_NOTICE, 633 "FTP LOGIN FAILED FROM %s, %s", 634 remotehost, curname); 635 } 636 pw = NULL; 637 if (login_attempts++ >= 5) { 638 syslog(LOG_NOTICE, 639 "repeated login failures from %s", 640 remotehost); 641 exit(0); 642 } 643 return; 644 } 645 } 646 647 /* password was ok; see if anything else prevents login */ 648 if (checkaccess(pw->pw_name)) { 649 reply(530, "User %s may not use FTP.", pw->pw_name); 650 if (logging) 651 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 652 remotehost, pw->pw_name); 653 pw = (struct passwd *) NULL; 654 return; 655 } 656 /* check for valid shell, if not guest user */ 657 if ((shell = pw->pw_shell) == NULL || *shell == 0) 658 shell = _PATH_BSHELL; 659 while ((cp = getusershell()) != NULL) 660 if (strcmp(cp, shell) == 0) 661 break; 662 endusershell(); 663 if (cp == NULL && guest == 0) { 664 reply(530, "User %s may not use FTP.", pw->pw_name); 665 if (logging) 666 syslog(LOG_NOTICE, 667 "FTP LOGIN REFUSED FROM %s, %s", 668 remotehost, pw->pw_name); 669 pw = (struct passwd *) NULL; 670 return; 671 } 672 673 login_attempts = 0; /* this time successful */ 674 if (setegid((gid_t)pw->pw_gid) < 0) { 675 reply(550, "Can't set gid."); 676 return; 677 } 678 (void) initgroups(pw->pw_name, pw->pw_gid); 679 680 /* open wtmp before chroot */ 681 logwtmp(ttyline, pw->pw_name, remotehost); 682 logged_in = 1; 683 684 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name, FALSE, FALSE); 685 686 /* parse ftpd.conf, setting up various parameters */ 687 if (guest) 688 parse_conf(CLASS_GUEST); 689 else if (dochroot) 690 parse_conf(CLASS_CHROOT); 691 else 692 parse_conf(CLASS_REAL); 693 694 home = "/"; 695 if (guest) { 696 /* 697 * We MUST do a chdir() after the chroot. Otherwise 698 * the old current directory will be accessible as "." 699 * outside the new root! 700 */ 701 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 702 chdir("/") < 0) { 703 reply(550, "Can't set guest privileges."); 704 goto bad; 705 } 706 } else if (dochroot) { 707 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 708 reply(550, "Can't change root."); 709 goto bad; 710 } 711 } else if (chdir(pw->pw_dir) < 0) { 712 if (chdir("/") < 0) { 713 reply(530, "User %s: can't change directory to %s.", 714 pw->pw_name, pw->pw_dir); 715 goto bad; 716 } else 717 lreply(230, "No directory! Logging in with home=/"); 718 } else 719 home = pw->pw_dir; 720 if (seteuid((uid_t)pw->pw_uid) < 0) { 721 reply(550, "Can't set uid."); 722 goto bad; 723 } 724 setenv("HOME", home, 1); 725 726 727 /* 728 * Display a login message, if it exists. 729 * N.B. reply(230,) must follow the message. 730 */ 731 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 732 char *cp, line[LINE_MAX]; 733 734 while (fgets(line, sizeof(line), fd) != NULL) { 735 if ((cp = strchr(line, '\n')) != NULL) 736 *cp = '\0'; 737 lreply(230, "%s", line); 738 } 739 (void) fflush(stdout); 740 (void) fclose(fd); 741 } 742 show_chdir_messages(230); 743 if (guest) { 744 reply(230, "Guest login ok, access restrictions apply."); 745 #ifdef HASSETPROCTITLE 746 snprintf(proctitle, sizeof(proctitle), 747 "%s: anonymous/%.*s", remotehost, 748 (int) (sizeof(proctitle) - sizeof(remotehost) - 749 sizeof(": anonymous/")), passwd); 750 setproctitle(proctitle); 751 #endif /* HASSETPROCTITLE */ 752 if (logging) 753 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 754 remotehost, passwd); 755 } else { 756 reply(230, "User %s logged in.", pw->pw_name); 757 #ifdef HASSETPROCTITLE 758 snprintf(proctitle, sizeof(proctitle), 759 "%s: %s", remotehost, pw->pw_name); 760 setproctitle(proctitle); 761 #endif /* HASSETPROCTITLE */ 762 if (logging) 763 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 764 remotehost, pw->pw_name); 765 } 766 (void) umask(curclass.umask); 767 return; 768 bad: 769 /* Forget all about it... */ 770 end_login(); 771 } 772 773 void 774 retrieve(cmd, name) 775 char *cmd, *name; 776 { 777 FILE *fin = NULL, *dout; 778 struct stat st; 779 int (*closefunc) __P((FILE *)) = NULL; 780 int log, sendrv, closerv, stderrfd, isconversion; 781 782 sendrv = closerv = stderrfd = -1; 783 isconversion = 0; 784 log = (cmd == 0); 785 if (cmd == NULL) { 786 fin = fopen(name, "r"), closefunc = fclose; 787 if (fin == NULL) 788 cmd = do_conversion(name); 789 if (cmd != NULL) { 790 isconversion++; 791 syslog(LOG_INFO, "get command: '%s'", cmd); 792 } 793 } 794 if (cmd != NULL) { 795 char line[BUFSIZ]; 796 char temp[MAXPATHLEN]; 797 798 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 799 stderrfd = mkstemp(temp); 800 if (stderrfd != -1) 801 (void)unlink(temp); 802 (void)snprintf(line, sizeof(line), cmd, name), name = line; 803 fin = ftpd_popen(line, "r", stderrfd), closefunc = ftpd_pclose; 804 st.st_size = -1; 805 st.st_blksize = BUFSIZ; 806 } 807 if (fin == NULL) { 808 if (errno != 0) { 809 perror_reply(550, name); 810 if (log) { 811 LOGCMD("get", name); 812 } 813 } 814 if (stderrfd != -1) 815 (void)close(stderrfd); 816 return; 817 } 818 byte_count = -1; 819 if (cmd == NULL 820 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 821 reply(550, "%s: not a plain file.", name); 822 goto done; 823 } 824 if (restart_point) { 825 if (type == TYPE_A) { 826 off_t i; 827 int c; 828 829 for (i = 0; i < restart_point; i++) { 830 if ((c=getc(fin)) == EOF) { 831 perror_reply(550, name); 832 goto done; 833 } 834 if (c == '\n') 835 i++; 836 } 837 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 838 perror_reply(550, name); 839 goto done; 840 } 841 } 842 dout = dataconn(name, st.st_size, "w"); 843 if (dout == NULL) 844 goto done; 845 sendrv = send_data(fin, dout, st.st_blksize); 846 (void) fclose(dout); 847 data = -1; 848 pdata = -1; 849 done: 850 if (log) 851 LOGBYTES("get", name, byte_count); 852 closerv = (*closefunc)(fin); 853 if (sendrv == 0) { 854 FILE *err; 855 struct stat sb; 856 857 if (cmd != NULL && closerv != 0) { 858 lreply(226, 859 "Command returned an exit status of %d", 860 closerv); 861 if (isconversion) 862 syslog(LOG_INFO, 863 "get command: '%s' returned %d", 864 cmd, closerv); 865 } 866 if (cmd != NULL && stderrfd != -1 && 867 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 868 ((err = fdopen(stderrfd, "r")) != NULL)) { 869 char *cp, line[LINE_MAX]; 870 871 lreply(226, "Command error messages:"); 872 rewind(err); 873 while (fgets(line, sizeof(line), err) != NULL) { 874 if ((cp = strchr(line, '\n')) != NULL) 875 *cp = '\0'; 876 lreply(226, " %s", line); 877 } 878 (void) fflush(stdout); 879 (void) fclose(err); 880 lreply(226, "End of command error messages."); 881 /* a reply(226,) must follow */ 882 } 883 reply(226, "Transfer complete."); 884 } 885 if (stderrfd != -1) 886 (void)close(stderrfd); 887 } 888 889 void 890 store(name, mode, unique) 891 char *name, *mode; 892 int unique; 893 { 894 FILE *fout, *din; 895 struct stat st; 896 int (*closefunc) __P((FILE *)); 897 898 if (unique && stat(name, &st) == 0 && 899 (name = gunique(name)) == NULL) { 900 LOGCMD(*mode == 'w' ? "put" : "append", name); 901 return; 902 } 903 904 if (restart_point) 905 mode = "r+"; 906 fout = fopen(name, mode); 907 closefunc = fclose; 908 if (fout == NULL) { 909 perror_reply(553, name); 910 LOGCMD(*mode == 'w' ? "put" : "append", name); 911 return; 912 } 913 byte_count = -1; 914 if (restart_point) { 915 if (type == TYPE_A) { 916 off_t i; 917 int c; 918 919 for (i = 0; i < restart_point; i++) { 920 if ((c=getc(fout)) == EOF) { 921 perror_reply(550, name); 922 goto done; 923 } 924 if (c == '\n') 925 i++; 926 } 927 /* 928 * We must do this seek to "current" position 929 * because we are changing from reading to 930 * writing. 931 */ 932 if (fseek(fout, 0L, SEEK_CUR) < 0) { 933 perror_reply(550, name); 934 goto done; 935 } 936 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 937 perror_reply(550, name); 938 goto done; 939 } 940 } 941 din = dataconn(name, (off_t)-1, "r"); 942 if (din == NULL) 943 goto done; 944 if (receive_data(din, fout) == 0) { 945 if (unique) 946 reply(226, "Transfer complete (unique file name:%s).", 947 name); 948 else 949 reply(226, "Transfer complete."); 950 } 951 (void) fclose(din); 952 data = -1; 953 pdata = -1; 954 done: 955 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 956 (*closefunc)(fout); 957 } 958 959 static FILE * 960 getdatasock(mode) 961 char *mode; 962 { 963 int on = 1, s, t, tries; 964 965 if (data >= 0) 966 return (fdopen(data, mode)); 967 (void) seteuid((uid_t)0); 968 s = socket(AF_INET, SOCK_STREAM, 0); 969 if (s < 0) 970 goto bad; 971 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 972 (char *) &on, sizeof(on)) < 0) 973 goto bad; 974 /* anchor socket to avoid multi-homing problems */ 975 data_source.sin_len = sizeof(struct sockaddr_in); 976 data_source.sin_family = AF_INET; 977 data_source.sin_addr = ctrl_addr.sin_addr; 978 for (tries = 1; ; tries++) { 979 if (bind(s, (struct sockaddr *)&data_source, 980 sizeof(data_source)) >= 0) 981 break; 982 if (errno != EADDRINUSE || tries > 10) 983 goto bad; 984 sleep(tries); 985 } 986 (void) seteuid((uid_t)pw->pw_uid); 987 #ifdef IP_TOS 988 on = IPTOS_THROUGHPUT; 989 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 990 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 991 #endif 992 return (fdopen(s, mode)); 993 bad: 994 /* Return the real value of errno (close may change it) */ 995 t = errno; 996 (void) seteuid((uid_t)pw->pw_uid); 997 (void) close(s); 998 errno = t; 999 return (NULL); 1000 } 1001 1002 static FILE * 1003 dataconn(name, size, mode) 1004 char *name; 1005 off_t size; 1006 char *mode; 1007 { 1008 char sizebuf[32]; 1009 FILE *file; 1010 int retry = 0, tos; 1011 1012 file_size = size; 1013 byte_count = 0; 1014 if (size != (off_t) -1) 1015 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 1016 (long long)size); 1017 else 1018 sizebuf[0] = '\0'; 1019 if (pdata >= 0) { 1020 struct sockaddr_in from; 1021 int s, fromlen = sizeof(from); 1022 1023 (void) alarm(curclass.timeout); 1024 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1025 (void) alarm(0); 1026 if (s < 0) { 1027 reply(425, "Can't open data connection."); 1028 (void) close(pdata); 1029 pdata = -1; 1030 return (NULL); 1031 } 1032 (void) close(pdata); 1033 pdata = s; 1034 #ifdef IP_TOS 1035 tos = IPTOS_THROUGHPUT; 1036 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1037 sizeof(int)); 1038 #endif 1039 reply(150, "Opening %s mode data connection for '%s'%s.", 1040 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1041 return (fdopen(pdata, mode)); 1042 } 1043 if (data >= 0) { 1044 reply(125, "Using existing data connection for '%s'%s.", 1045 name, sizebuf); 1046 usedefault = 1; 1047 return (fdopen(data, mode)); 1048 } 1049 if (usedefault) 1050 data_dest = his_addr; 1051 usedefault = 1; 1052 file = getdatasock(mode); 1053 if (file == NULL) { 1054 reply(425, "Can't create data socket (%s,%d): %s.", 1055 inet_ntoa(data_source.sin_addr), 1056 ntohs(data_source.sin_port), strerror(errno)); 1057 return (NULL); 1058 } 1059 data = fileno(file); 1060 while (connect(data, (struct sockaddr *)&data_dest, 1061 sizeof(data_dest)) < 0) { 1062 if (errno == EADDRINUSE && retry < swaitmax) { 1063 sleep((unsigned) swaitint); 1064 retry += swaitint; 1065 continue; 1066 } 1067 perror_reply(425, "Can't build data connection"); 1068 (void) fclose(file); 1069 data = -1; 1070 return (NULL); 1071 } 1072 reply(150, "Opening %s mode data connection for '%s'%s.", 1073 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1074 return (file); 1075 } 1076 1077 /* 1078 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1079 * encapsulation of the data subject * to Mode, Structure, and Type. 1080 * 1081 * NB: Form isn't handled. 1082 */ 1083 static int 1084 send_data(instr, outstr, blksize) 1085 FILE *instr, *outstr; 1086 off_t blksize; 1087 { 1088 int c, cnt, filefd, netfd; 1089 char *buf; 1090 1091 transflag++; 1092 if (setjmp(urgcatch)) { 1093 transflag = 0; 1094 return (-1); 1095 } 1096 1097 switch (type) { 1098 1099 case TYPE_A: 1100 while ((c = getc(instr)) != EOF) { 1101 byte_count++; 1102 if (c == '\n') { 1103 if (ferror(outstr)) 1104 goto data_err; 1105 (void) putc('\r', outstr); 1106 } 1107 (void) putc(c, outstr); 1108 } 1109 fflush(outstr); 1110 transflag = 0; 1111 if (ferror(instr)) 1112 goto file_err; 1113 if (ferror(outstr)) 1114 goto data_err; 1115 return (0); 1116 1117 case TYPE_I: 1118 case TYPE_L: 1119 if ((buf = malloc((u_int)blksize)) == NULL) { 1120 transflag = 0; 1121 perror_reply(451, "Local resource failure: malloc"); 1122 return (-1); 1123 } 1124 netfd = fileno(outstr); 1125 filefd = fileno(instr); 1126 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1127 write(netfd, buf, cnt) == cnt) 1128 byte_count += cnt; 1129 transflag = 0; 1130 (void)free(buf); 1131 if (cnt != 0) { 1132 if (cnt < 0) 1133 goto file_err; 1134 goto data_err; 1135 } 1136 return (0); 1137 default: 1138 transflag = 0; 1139 reply(550, "Unimplemented TYPE %d in send_data", type); 1140 return (-1); 1141 } 1142 1143 data_err: 1144 transflag = 0; 1145 perror_reply(426, "Data connection"); 1146 return (-1); 1147 1148 file_err: 1149 transflag = 0; 1150 perror_reply(551, "Error on input file"); 1151 return (-1); 1152 } 1153 1154 /* 1155 * Transfer data from peer to "outstr" using the appropriate encapulation of 1156 * the data subject to Mode, Structure, and Type. 1157 * 1158 * N.B.: Form isn't handled. 1159 */ 1160 static int 1161 receive_data(instr, outstr) 1162 FILE *instr, *outstr; 1163 { 1164 int c, cnt, bare_lfs; 1165 char buf[BUFSIZ]; 1166 #ifdef __GNUC__ 1167 (void) &bare_lfs; 1168 #endif 1169 1170 bare_lfs = 0; 1171 transflag++; 1172 if (setjmp(urgcatch)) { 1173 transflag = 0; 1174 return (-1); 1175 } 1176 1177 switch (type) { 1178 1179 case TYPE_I: 1180 case TYPE_L: 1181 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1182 if (write(fileno(outstr), buf, cnt) != cnt) 1183 goto file_err; 1184 byte_count += cnt; 1185 } 1186 if (cnt < 0) 1187 goto data_err; 1188 transflag = 0; 1189 return (0); 1190 1191 case TYPE_E: 1192 reply(553, "TYPE E not implemented."); 1193 transflag = 0; 1194 return (-1); 1195 1196 case TYPE_A: 1197 while ((c = getc(instr)) != EOF) { 1198 byte_count++; 1199 if (c == '\n') 1200 bare_lfs++; 1201 while (c == '\r') { 1202 if (ferror(outstr)) 1203 goto data_err; 1204 if ((c = getc(instr)) != '\n') { 1205 (void) putc ('\r', outstr); 1206 if (c == '\0' || c == EOF) 1207 goto contin2; 1208 } 1209 } 1210 (void) putc(c, outstr); 1211 contin2: ; 1212 } 1213 fflush(outstr); 1214 if (ferror(instr)) 1215 goto data_err; 1216 if (ferror(outstr)) 1217 goto file_err; 1218 transflag = 0; 1219 if (bare_lfs) { 1220 lreply(226, 1221 "WARNING! %d bare linefeeds received in ASCII mode", 1222 bare_lfs); 1223 (void)printf(" File may not have transferred correctly.\r\n"); 1224 } 1225 return (0); 1226 default: 1227 reply(550, "Unimplemented TYPE %d in receive_data", type); 1228 transflag = 0; 1229 return (-1); 1230 } 1231 1232 data_err: 1233 transflag = 0; 1234 perror_reply(426, "Data Connection"); 1235 return (-1); 1236 1237 file_err: 1238 transflag = 0; 1239 perror_reply(452, "Error writing file"); 1240 return (-1); 1241 } 1242 1243 void 1244 statfilecmd(filename) 1245 char *filename; 1246 { 1247 FILE *fin; 1248 int c; 1249 char line[LINE_MAX]; 1250 1251 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1252 fin = ftpd_popen(line, "r", STDOUT_FILENO); 1253 lreply(211, "status of %s:", filename); 1254 while ((c = getc(fin)) != EOF) { 1255 if (c == '\n') { 1256 if (ferror(stdout)){ 1257 perror_reply(421, "control connection"); 1258 (void) ftpd_pclose(fin); 1259 dologout(1); 1260 /* NOTREACHED */ 1261 } 1262 if (ferror(fin)) { 1263 perror_reply(551, filename); 1264 (void) ftpd_pclose(fin); 1265 return; 1266 } 1267 (void) putc('\r', stdout); 1268 } 1269 (void) putc(c, stdout); 1270 } 1271 (void) ftpd_pclose(fin); 1272 reply(211, "End of Status"); 1273 } 1274 1275 void 1276 statcmd() 1277 { 1278 struct sockaddr_in *sin; 1279 u_char *a, *p; 1280 1281 lreply(211, "%s FTP server status:", hostname); 1282 lreply(211, "%s", version); 1283 if (isdigit(remotehost[0])) 1284 lreply(211, "Connected to %s", remotehost); 1285 else 1286 lreply(211, "Connected to %s (%s)", remotehost, 1287 inet_ntoa(his_addr.sin_addr)); 1288 if (logged_in) { 1289 if (guest) 1290 lreply(211, "Logged in anonymously"); 1291 else 1292 lreply(211, "Logged in as %s", pw->pw_name); 1293 } else if (askpasswd) 1294 lreply(211, "Waiting for password"); 1295 else 1296 lreply(211, "Waiting for user name"); 1297 printf("211- TYPE: %s", typenames[type]); 1298 if (type == TYPE_A || type == TYPE_E) 1299 printf(", FORM: %s", formnames[form]); 1300 if (type == TYPE_L) 1301 #if NBBY == 8 1302 printf(" %d", NBBY); 1303 #else 1304 printf(" %d", bytesize); /* need definition! */ 1305 #endif 1306 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1307 strunames[stru], modenames[mode]); 1308 if (data != -1) 1309 lreply(211, "Data connection open"); 1310 else if (pdata != -1) { 1311 printf("211- in Passive mode"); 1312 sin = &pasv_addr; 1313 goto printaddr; 1314 } else if (usedefault == 0) { 1315 printf("211- PORT"); 1316 sin = &data_dest; 1317 printaddr: 1318 a = (u_char *) &sin->sin_addr; 1319 p = (u_char *) &sin->sin_port; 1320 #define UC(b) (((int) b) & 0xff) 1321 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1322 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1323 #undef UC 1324 } else 1325 lreply(211, "No data connection"); 1326 1327 if (logged_in) { 1328 struct ftpconv *cp; 1329 1330 lreply(211, ""); 1331 lreply(211, "Class: %s", curclass.classname); 1332 lreply(211, "Check PORT commands: %sabled", 1333 curclass.checkportcmd ? "en" : "dis"); 1334 if (curclass.display) 1335 lreply(211, "Display file: %s", curclass.display); 1336 if (curclass.notify) 1337 lreply(211, "Notify fileglob: %s", curclass.notify); 1338 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1339 curclass.timeout, curclass.maxtimeout); 1340 lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled", 1341 curclass.modify ? "en" : "dis"); 1342 lreply(211, "Umask: %.04o", curclass.umask); 1343 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1344 if (cp->suffix == NULL || cp->types == NULL || 1345 cp->command == NULL) 1346 continue; 1347 lreply(211, 1348 "Conversion: %s [%s] disable: %s, command: %s", 1349 cp->suffix, cp->types, cp->disable, cp->command); 1350 } 1351 } 1352 1353 reply(211, "End of status"); 1354 } 1355 1356 void 1357 fatal(s) 1358 char *s; 1359 { 1360 1361 reply(451, "Error in server: %s\n", s); 1362 reply(221, "Closing connection due to server error."); 1363 dologout(0); 1364 /* NOTREACHED */ 1365 } 1366 1367 void 1368 #ifdef __STDC__ 1369 reply(int n, const char *fmt, ...) 1370 #else 1371 reply(n, fmt, va_alist) 1372 int n; 1373 char *fmt; 1374 va_dcl 1375 #endif 1376 { 1377 va_list ap; 1378 #ifdef __STDC__ 1379 va_start(ap, fmt); 1380 #else 1381 va_start(ap); 1382 #endif 1383 (void)printf("%d ", n); 1384 (void)vprintf(fmt, ap); 1385 (void)printf("\r\n"); 1386 (void)fflush(stdout); 1387 if (debug) { 1388 syslog(LOG_DEBUG, "<--- %d ", n); 1389 vsyslog(LOG_DEBUG, fmt, ap); 1390 } 1391 } 1392 1393 void 1394 #ifdef __STDC__ 1395 lreply(int n, const char *fmt, ...) 1396 #else 1397 lreply(n, fmt, va_alist) 1398 int n; 1399 char *fmt; 1400 va_dcl 1401 #endif 1402 { 1403 va_list ap; 1404 #ifdef __STDC__ 1405 va_start(ap, fmt); 1406 #else 1407 va_start(ap); 1408 #endif 1409 (void)printf("%d- ", n); 1410 (void)vprintf(fmt, ap); 1411 (void)printf("\r\n"); 1412 (void)fflush(stdout); 1413 if (debug) { 1414 syslog(LOG_DEBUG, "<--- %d- ", n); 1415 vsyslog(LOG_DEBUG, fmt, ap); 1416 } 1417 } 1418 1419 static void 1420 ack(s) 1421 char *s; 1422 { 1423 1424 reply(250, "%s command successful.", s); 1425 } 1426 1427 void 1428 nack(s) 1429 char *s; 1430 { 1431 1432 reply(502, "%s command not implemented.", s); 1433 } 1434 1435 void 1436 delete(name) 1437 char *name; 1438 { 1439 1440 LOGCMD("delete", name); 1441 if (remove(name) < 0) 1442 perror_reply(550, name); 1443 else 1444 ack("DELE"); 1445 } 1446 1447 void 1448 cwd(path) 1449 const char *path; 1450 { 1451 1452 if (chdir(path) < 0) 1453 perror_reply(550, path); 1454 else { 1455 show_chdir_messages(250); 1456 ack("CWD"); 1457 } 1458 } 1459 1460 static void 1461 replydirname(name, message) 1462 const char *name, *message; 1463 { 1464 char npath[MAXPATHLEN + 1]; 1465 int i; 1466 1467 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1468 npath[i] = *name; 1469 if (*name == '"') 1470 npath[++i] = '"'; 1471 } 1472 npath[i] = '\0'; 1473 reply(257, "\"%s\" %s", npath, message); 1474 } 1475 1476 void 1477 makedir(name) 1478 char *name; 1479 { 1480 1481 LOGCMD("mkdir", name); 1482 if (mkdir(name, 0777) < 0) 1483 perror_reply(550, name); 1484 else 1485 replydirname(name, "directory created."); 1486 } 1487 1488 void 1489 removedir(name) 1490 char *name; 1491 { 1492 1493 LOGCMD("rmdir", name); 1494 if (rmdir(name) < 0) 1495 perror_reply(550, name); 1496 else 1497 ack("RMD"); 1498 } 1499 1500 void 1501 pwd() 1502 { 1503 char path[MAXPATHLEN + 1]; 1504 1505 if (getcwd(path, sizeof(path) - 1) == NULL) 1506 reply(550, "Can't get the current directory: %s.", 1507 strerror(errno)); 1508 else 1509 replydirname(path, "is the current directory."); 1510 } 1511 1512 char * 1513 renamefrom(name) 1514 char *name; 1515 { 1516 struct stat st; 1517 1518 if (stat(name, &st) < 0) { 1519 perror_reply(550, name); 1520 return (NULL); 1521 } 1522 reply(350, "File exists, ready for destination name"); 1523 return (name); 1524 } 1525 1526 void 1527 renamecmd(from, to) 1528 char *from, *to; 1529 { 1530 1531 LOGCMD2("rename", from, to); 1532 if (rename(from, to) < 0) 1533 perror_reply(550, "rename"); 1534 else 1535 ack("RNTO"); 1536 } 1537 1538 static void 1539 dolog(sin) 1540 struct sockaddr_in *sin; 1541 { 1542 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1543 sizeof(struct in_addr), AF_INET); 1544 1545 if (hp) 1546 (void)strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1547 else 1548 (void)strncpy(remotehost, inet_ntoa(sin->sin_addr), 1549 sizeof(remotehost)); 1550 remotehost[sizeof(remotehost) - 1] = '\0'; 1551 #ifdef HASSETPROCTITLE 1552 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1553 setproctitle(proctitle); 1554 #endif /* HASSETPROCTITLE */ 1555 1556 if (logging) 1557 syslog(LOG_INFO, "connection from %s", remotehost); 1558 } 1559 1560 /* 1561 * Record logout in wtmp file 1562 * and exit with supplied status. 1563 */ 1564 void 1565 dologout(status) 1566 int status; 1567 { 1568 /* 1569 * Prevent reception of SIGURG from resulting in a resumption 1570 * back to the main program loop. 1571 */ 1572 transflag = 0; 1573 1574 if (logged_in) { 1575 (void) seteuid((uid_t)0); 1576 logwtmp(ttyline, "", ""); 1577 #ifdef KERBEROS 1578 if (!notickets && krbtkfile_env) 1579 unlink(krbtkfile_env); 1580 #endif 1581 } 1582 /* beware of flushing buffers after a SIGPIPE */ 1583 _exit(status); 1584 } 1585 1586 static void 1587 myoob(signo) 1588 int signo; 1589 { 1590 char *cp; 1591 1592 /* only process if transfer occurring */ 1593 if (!transflag) 1594 return; 1595 cp = tmpline; 1596 if (getline(cp, 7, stdin) == NULL) { 1597 reply(221, "You could at least say goodbye."); 1598 dologout(0); 1599 } 1600 if (strcasecmp(cp, "ABOR\r\n") == 0) { 1601 tmpline[0] = '\0'; 1602 reply(426, "Transfer aborted. Data connection closed."); 1603 reply(226, "Abort successful"); 1604 longjmp(urgcatch, 1); 1605 } 1606 if (strcasecmp(cp, "STAT\r\n") == 0) { 1607 if (file_size != (off_t) -1) 1608 reply(213, "Status: %qd of %qd bytes transferred", 1609 byte_count, file_size); 1610 else 1611 reply(213, "Status: %qd bytes transferred", byte_count); 1612 } 1613 } 1614 1615 /* 1616 * Note: a response of 425 is not mentioned as a possible response to 1617 * the PASV command in RFC959. However, it has been blessed as 1618 * a legitimate response by Jon Postel in a telephone conversation 1619 * with Rick Adams on 25 Jan 89. 1620 */ 1621 void 1622 passive() 1623 { 1624 int len; 1625 char *p, *a; 1626 1627 pdata = socket(AF_INET, SOCK_STREAM, 0); 1628 if (pdata < 0 || !logged_in) { 1629 perror_reply(425, "Can't open passive connection"); 1630 return; 1631 } 1632 pasv_addr = ctrl_addr; 1633 pasv_addr.sin_port = 0; 1634 (void) seteuid((uid_t)0); 1635 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1636 (void) seteuid((uid_t)pw->pw_uid); 1637 goto pasv_error; 1638 } 1639 (void) seteuid((uid_t)pw->pw_uid); 1640 len = sizeof(pasv_addr); 1641 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1642 goto pasv_error; 1643 if (listen(pdata, 1) < 0) 1644 goto pasv_error; 1645 a = (char *) &pasv_addr.sin_addr; 1646 p = (char *) &pasv_addr.sin_port; 1647 1648 #define UC(b) (((int) b) & 0xff) 1649 1650 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1651 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1652 return; 1653 1654 pasv_error: 1655 (void) close(pdata); 1656 pdata = -1; 1657 perror_reply(425, "Can't open passive connection"); 1658 return; 1659 } 1660 1661 /* 1662 * Generate unique name for file with basename "local". 1663 * The file named "local" is already known to exist. 1664 * Generates failure reply on error. 1665 * 1666 * XXX this function should under go changes similar to 1667 * the mktemp(3)/mkstemp(3) changes. 1668 */ 1669 static char * 1670 gunique(local) 1671 char *local; 1672 { 1673 static char new[MAXPATHLEN]; 1674 struct stat st; 1675 int count, len; 1676 char *cp; 1677 1678 cp = strrchr(local, '/'); 1679 if (cp) 1680 *cp = '\0'; 1681 if (stat(cp ? local : ".", &st) < 0) { 1682 perror_reply(553, cp ? local : "."); 1683 return (NULL); 1684 } 1685 if (cp) 1686 *cp = '/'; 1687 (void) strcpy(new, local); 1688 len = strlen(new); 1689 cp = new + len; 1690 *cp++ = '.'; 1691 for (count = 1; count < 100; count++) { 1692 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1693 if (stat(new, &st) < 0) 1694 return (new); 1695 } 1696 reply(452, "Unique file name cannot be created."); 1697 return (NULL); 1698 } 1699 1700 /* 1701 * Format and send reply containing system error number. 1702 */ 1703 void 1704 perror_reply(code, string) 1705 int code; 1706 const char *string; 1707 { 1708 1709 reply(code, "%s: %s.", string, strerror(errno)); 1710 } 1711 1712 static char *onefile[] = { 1713 "", 1714 0 1715 }; 1716 1717 void 1718 send_file_list(whichf) 1719 char *whichf; 1720 { 1721 struct stat st; 1722 DIR *dirp = NULL; 1723 struct dirent *dir; 1724 FILE *dout = NULL; 1725 char **dirlist, *dirname; 1726 int simple = 0; 1727 int freeglob = 0; 1728 glob_t gl; 1729 #ifdef __GNUC__ 1730 (void) &dout; 1731 (void) &dirlist; 1732 (void) &simple; 1733 (void) &freeglob; 1734 #endif 1735 1736 if (strpbrk(whichf, "~{[*?") != NULL) { 1737 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 1738 1739 memset(&gl, 0, sizeof(gl)); 1740 freeglob = 1; 1741 if (glob(whichf, flags, 0, &gl)) { 1742 reply(550, "not found"); 1743 goto out; 1744 } else if (gl.gl_pathc == 0) { 1745 errno = ENOENT; 1746 perror_reply(550, whichf); 1747 goto out; 1748 } 1749 dirlist = gl.gl_pathv; 1750 } else { 1751 onefile[0] = whichf; 1752 dirlist = onefile; 1753 simple = 1; 1754 } 1755 1756 if (setjmp(urgcatch)) { 1757 transflag = 0; 1758 goto out; 1759 } 1760 while ((dirname = *dirlist++) != NULL) { 1761 int trailingslash = 0; 1762 1763 if (stat(dirname, &st) < 0) { 1764 /* 1765 * If user typed "ls -l", etc, and the client 1766 * used NLST, do what the user meant. 1767 */ 1768 if (dirname[0] == '-' && *dirlist == NULL && 1769 transflag == 0) { 1770 retrieve("/bin/ls %s", dirname); 1771 goto out; 1772 } 1773 perror_reply(550, whichf); 1774 if (dout != NULL) { 1775 (void) fclose(dout); 1776 transflag = 0; 1777 data = -1; 1778 pdata = -1; 1779 } 1780 goto out; 1781 } 1782 1783 if (S_ISREG(st.st_mode)) { 1784 if (dout == NULL) { 1785 dout = dataconn("file list", (off_t)-1, "w"); 1786 if (dout == NULL) 1787 goto out; 1788 transflag++; 1789 } 1790 fprintf(dout, "%s%s\n", dirname, 1791 type == TYPE_A ? "\r" : ""); 1792 byte_count += strlen(dirname) + 1; 1793 continue; 1794 } else if (!S_ISDIR(st.st_mode)) 1795 continue; 1796 1797 if (dirname[strlen(dirname) - 1] == '/') 1798 trailingslash++; 1799 1800 if ((dirp = opendir(dirname)) == NULL) 1801 continue; 1802 1803 while ((dir = readdir(dirp)) != NULL) { 1804 char nbuf[MAXPATHLEN]; 1805 1806 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1807 continue; 1808 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1809 dir->d_namlen == 2) 1810 continue; 1811 1812 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1813 trailingslash ? "" : "/", dir->d_name); 1814 1815 /* 1816 * We have to do a stat to ensure it's 1817 * not a directory or special file. 1818 */ 1819 if (simple || (stat(nbuf, &st) == 0 && 1820 S_ISREG(st.st_mode))) { 1821 if (dout == NULL) { 1822 dout = dataconn("file list", (off_t)-1, 1823 "w"); 1824 if (dout == NULL) 1825 goto out; 1826 transflag++; 1827 } 1828 if (nbuf[0] == '.' && nbuf[1] == '/') 1829 fprintf(dout, "%s%s\n", &nbuf[2], 1830 type == TYPE_A ? "\r" : ""); 1831 else 1832 fprintf(dout, "%s%s\n", nbuf, 1833 type == TYPE_A ? "\r" : ""); 1834 byte_count += strlen(nbuf) + 1; 1835 } 1836 } 1837 (void) closedir(dirp); 1838 } 1839 1840 if (dout == NULL) 1841 reply(550, "No files found."); 1842 else if (ferror(dout) != 0) 1843 perror_reply(550, "Data connection"); 1844 else 1845 reply(226, "Transfer complete."); 1846 1847 transflag = 0; 1848 if (dout != NULL) 1849 (void) fclose(dout); 1850 data = -1; 1851 pdata = -1; 1852 out: 1853 if (freeglob) { 1854 freeglob = 0; 1855 globfree(&gl); 1856 } 1857 } 1858 1859 char * 1860 conffilename(s) 1861 const char *s; 1862 { 1863 static char filename[MAXPATHLEN]; 1864 1865 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1866 return filename; 1867 } 1868 1869 char * 1870 xstrdup(s) 1871 const char *s; 1872 { 1873 char *new = strdup(s); 1874 1875 if (new == NULL) 1876 fatal("Local resource failure: malloc"); 1877 /* NOTREACHED */ 1878 return (new); 1879 } 1880
Indexes created Thu Sep 25 16:09:42 GMT 2025