ftpd.c revision 1.37
1 /* $NetBSD: ftpd.c,v 1.37 1997/10/12 13:52:51 mycroft 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 1.37 1997/10/12 13:52:51 mycroft Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 /* 52 * FTP server. 53 */ 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 #include <sys/ioctl.h> 57 #include <sys/socket.h> 58 #include <sys/wait.h> 59 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 91 #include "extern.h" 92 #include "pathnames.h" 93 94 #if __STDC__ 95 #include <stdarg.h> 96 #else 97 #include <varargs.h> 98 #endif 99 100 static char version[] = "Version 7.01"; 101 102 extern off_t restart_point; 103 extern char cbuf[]; 104 extern int yyparse __P((void)); 105 106 struct sockaddr_in ctrl_addr; 107 struct sockaddr_in data_source; 108 struct sockaddr_in data_dest; 109 struct sockaddr_in his_addr; 110 struct sockaddr_in pasv_addr; 111 112 int data; 113 jmp_buf errcatch, urgcatch; 114 int logged_in; 115 struct passwd *pw; 116 int debug; 117 int logging; 118 int guest; 119 int dochroot; 120 int type; 121 int form; 122 int stru; /* avoid C keyword */ 123 int mode; 124 int usedefault = 1; /* for data transfers */ 125 int pdata = -1; /* for passive mode */ 126 sig_atomic_t transflag; 127 off_t file_size; 128 off_t byte_count; 129 char tmpline[7]; 130 char hostname[MAXHOSTNAMELEN]; 131 char remotehost[MAXHOSTNAMELEN]; 132 static char ttyline[20]; 133 char *tty = ttyline; /* for klogin */ 134 static char *anondir = NULL; 135 static char confdir[MAXPATHLEN]; 136 137 extern struct ftpclass curclass; 138 139 #ifdef KERBEROS 140 int notickets = 1; 141 char *krbtkfile_env = NULL; 142 #endif 143 144 /* 145 * Timeout intervals for retrying connections 146 * to hosts that don't accept PORT cmds. This 147 * is a kludge, but given the problems with TCP... 148 */ 149 #define SWAITMAX 90 /* wait at most 90 seconds */ 150 #define SWAITINT 5 /* interval between retries */ 151 152 int swaitmax = SWAITMAX; 153 int swaitint = SWAITINT; 154 155 #ifdef HASSETPROCTITLE 156 char proctitle[BUFSIZ]; /* initial part of title */ 157 #endif /* HASSETPROCTITLE */ 158 159 #define LOGCMD(cmd, file) \ 160 if (logging > 1) \ 161 syslog(LOG_INFO,"%s %s%s", cmd, \ 162 *(file) == '/' ? "" : curdir(), file); 163 #define LOGCMD2(cmd, file1, file2) \ 164 if (logging > 1) \ 165 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 166 *(file1) == '/' ? "" : curdir(), file1, \ 167 *(file2) == '/' ? "" : curdir(), file2); 168 #define LOGBYTES(cmd, file, cnt) \ 169 if (logging > 1) { \ 170 if (cnt == (off_t)-1) \ 171 syslog(LOG_INFO,"%s %s%s", cmd, \ 172 *(file) == '/' ? "" : curdir(), file); \ 173 else \ 174 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 175 cmd, (*(file) == '/') ? "" : curdir(), file, \ 176 (long long)cnt); \ 177 } 178 179 static void ack __P((char *)); 180 static void myoob __P((int)); 181 static int checkuser __P((char *, char *)); 182 static int checkaccess __P((char *)); 183 static FILE *dataconn __P((char *, off_t, char *)); 184 static void dolog __P((struct sockaddr_in *)); 185 static char *curdir __P((void)); 186 static void end_login __P((void)); 187 static FILE *getdatasock __P((char *)); 188 static char *gunique __P((char *)); 189 static void lostconn __P((int)); 190 static int receive_data __P((FILE *, FILE *)); 191 static void replydirname __P((const char *, const char *)); 192 static void send_data __P((FILE *, FILE *, off_t)); 193 static struct passwd * 194 sgetpwnam __P((char *)); 195 static char *sgetsave __P((char *)); 196 197 int main __P((int, char *[], char **)); 198 199 #if defined (KERBEROS) 200 int klogin __P((struct passwd *, char *, char *, char *)); 201 #endif 202 203 static char * 204 curdir() 205 { 206 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 207 208 if (getcwd(path, sizeof(path)-2) == NULL) 209 return (""); 210 if (path[1] != '\0') /* special case for root dir. */ 211 strcat(path, "/"); 212 /* For guest account, skip / since it's chrooted */ 213 return (guest ? path+1 : path); 214 } 215 216 int 217 main(argc, argv, envp) 218 int argc; 219 char *argv[]; 220 char **envp; 221 { 222 int addrlen, ch, on = 1, tos; 223 char *cp, line[LINE_MAX]; 224 FILE *fd; 225 226 debug = 0; 227 logging = 0; 228 (void)strcpy(confdir, _DEFAULT_CONFDIR); 229 230 while ((ch = getopt(argc, argv, "a:c:C:dlt:T:u:v")) != -1) { 231 switch (ch) { 232 case 'a': 233 anondir = optarg; 234 break; 235 236 case 'c': 237 (void)strncpy(confdir, optarg, sizeof(confdir)); 238 confdir[sizeof(confdir)-1] = '\0'; 239 break; 240 241 case 'C': 242 exit(checkaccess(optarg)); 243 /* NOTREACHED */ 244 245 case 'd': 246 case 'v': /* deprecated */ 247 debug = 1; 248 break; 249 250 case 'l': 251 logging++; /* > 1 == extra logging */ 252 break; 253 254 case 't': 255 case 'T': 256 case 'u': 257 warnx("-%c has been deprecated in favour of ftpd.conf", 258 ch); 259 break; 260 261 default: 262 if (optopt == 'a' || optopt == 'C') 263 exit(1); 264 warnx("unknown flag -%c ignored", optopt); 265 break; 266 } 267 } 268 269 /* 270 * LOG_NDELAY sets up the logging connection immediately, 271 * necessary for anonymous ftp's that chroot and can't do it later. 272 */ 273 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 274 addrlen = sizeof(his_addr); 275 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 276 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 277 exit(1); 278 } 279 addrlen = sizeof(ctrl_addr); 280 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 281 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 282 exit(1); 283 } 284 #ifdef IP_TOS 285 tos = IPTOS_LOWDELAY; 286 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 287 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 288 #endif 289 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 290 291 /* set this here so klogin can use it... */ 292 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 293 294 (void) freopen(_PATH_DEVNULL, "w", stderr); 295 (void) signal(SIGPIPE, lostconn); 296 (void) signal(SIGCHLD, SIG_IGN); 297 if ((long)signal(SIGURG, myoob) < 0) 298 syslog(LOG_ERR, "signal: %m"); 299 300 /* Try to handle urgent data inline */ 301 #ifdef SO_OOBINLINE 302 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 303 syslog(LOG_ERR, "setsockopt: %m"); 304 #endif 305 306 #ifdef F_SETOWN 307 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 308 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 309 #endif 310 dolog(&his_addr); 311 /* 312 * Set up default state 313 */ 314 data = -1; 315 type = TYPE_A; 316 form = FORM_N; 317 stru = STRU_F; 318 mode = MODE_S; 319 tmpline[0] = '\0'; 320 321 /* If logins are disabled, print out the message. */ 322 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 323 while (fgets(line, sizeof(line), fd) != NULL) { 324 if ((cp = strchr(line, '\n')) != NULL) 325 *cp = '\0'; 326 lreply(530, "%s", line); 327 } 328 (void) fflush(stdout); 329 (void) fclose(fd); 330 reply(530, "System not available."); 331 exit(0); 332 } 333 if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) { 334 while (fgets(line, sizeof(line), fd) != NULL) { 335 if ((cp = strchr(line, '\n')) != NULL) 336 *cp = '\0'; 337 lreply(220, "%s", line); 338 } 339 (void) fflush(stdout); 340 (void) fclose(fd); 341 /* reply(220,) must follow */ 342 } 343 (void) gethostname(hostname, sizeof(hostname)); 344 reply(220, "%s FTP server (%s) ready.", hostname, version); 345 (void) setjmp(errcatch); 346 for (;;) 347 (void) yyparse(); 348 /* NOTREACHED */ 349 } 350 351 static void 352 lostconn(signo) 353 int signo; 354 { 355 356 if (debug) 357 syslog(LOG_DEBUG, "lost connection"); 358 dologout(1); 359 } 360 361 /* 362 * Helper function for sgetpwnam(). 363 */ 364 static char * 365 sgetsave(s) 366 char *s; 367 { 368 char *new = malloc((unsigned) strlen(s) + 1); 369 370 if (new == NULL) { 371 perror_reply(421, "Local resource failure: malloc"); 372 dologout(1); 373 /* NOTREACHED */ 374 } 375 (void) strcpy(new, s); 376 return (new); 377 } 378 379 /* 380 * Save the result of a getpwnam. Used for USER command, since 381 * the data returned must not be clobbered by any other command 382 * (e.g., globbing). 383 */ 384 static struct passwd * 385 sgetpwnam(name) 386 char *name; 387 { 388 static struct passwd save; 389 struct passwd *p; 390 391 if ((p = getpwnam(name)) == NULL) 392 return (p); 393 if (save.pw_name) { 394 free(save.pw_name); 395 free(save.pw_passwd); 396 free(save.pw_gecos); 397 free(save.pw_dir); 398 free(save.pw_shell); 399 } 400 save = *p; 401 save.pw_name = sgetsave(p->pw_name); 402 save.pw_passwd = sgetsave(p->pw_passwd); 403 save.pw_gecos = sgetsave(p->pw_gecos); 404 save.pw_dir = sgetsave(p->pw_dir); 405 save.pw_shell = sgetsave(p->pw_shell); 406 return (&save); 407 } 408 409 static int login_attempts; /* number of failed login attempts */ 410 static int askpasswd; /* had user command, ask for passwd */ 411 static char curname[10]; /* current USER name */ 412 413 /* 414 * USER command. 415 * Sets global passwd pointer pw if named account exists and is acceptable; 416 * sets askpasswd if a PASS command is expected. If logged in previously, 417 * need to reset state. If name is "ftp" or "anonymous", the name is not in 418 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 419 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 420 * requesting login privileges. Disallow anyone who does not have a standard 421 * shell as returned by getusershell(). Disallow anyone mentioned in the file 422 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 423 */ 424 void 425 user(name) 426 char *name; 427 { 428 if (logged_in) { 429 if (guest) { 430 reply(530, "Can't change user from guest login."); 431 return; 432 } else if (dochroot) { 433 reply(530, "Can't change user from chroot user."); 434 return; 435 } 436 end_login(); 437 } 438 439 guest = 0; 440 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 441 if (checkaccess("ftp") || checkaccess("anonymous")) 442 reply(530, "User %s access denied.", name); 443 else if ((pw = sgetpwnam("ftp")) != NULL) { 444 guest = 1; 445 askpasswd = 1; 446 reply(331, 447 "Guest login ok, type your name as password."); 448 } else 449 reply(530, "User %s unknown.", name); 450 if (!askpasswd && logging) 451 syslog(LOG_NOTICE, 452 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 453 return; 454 } 455 456 pw = sgetpwnam(name); 457 if (logging) 458 strncpy(curname, name, sizeof(curname)-1); 459 460 #ifdef SKEY 461 if (skey_haskey(name) == 0) { 462 char *myskey; 463 464 myskey = skey_keyinfo(name); 465 reply(331, "Password [%s] required for %s.", 466 myskey ? myskey : "error getting challenge", name); 467 } else 468 #endif 469 reply(331, "Password required for %s.", name); 470 471 askpasswd = 1; 472 /* 473 * Delay before reading passwd after first failed 474 * attempt to slow down passwd-guessing programs. 475 */ 476 if (login_attempts) 477 sleep((unsigned) login_attempts); 478 } 479 480 /* 481 * Check if a user is in the file "fname" 482 */ 483 static int 484 checkuser(fname, name) 485 char *fname; 486 char *name; 487 { 488 FILE *fd; 489 int found = 0; 490 char *p, line[BUFSIZ]; 491 492 if ((fd = fopen(fname, "r")) != NULL) { 493 while (fgets(line, sizeof(line), fd) != NULL) 494 if ((p = strchr(line, '\n')) != NULL) { 495 *p = '\0'; 496 if (line[0] == '#') 497 continue; 498 if (strcmp(line, name) == 0) { 499 found = 1; 500 break; 501 } 502 } 503 (void) fclose(fd); 504 } 505 return (found); 506 } 507 508 /* 509 * Determine whether a user has access, based on information in 510 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 511 * `allow' or `deny' (with deny being the default if anything but 512 * `allow', or nothing at all, is specified). 513 * 514 * Each glob is matched against the username in turn, and the first 515 * match found is used. If no match is found, access is allowed. 516 * 517 * Any line starting with `#' is considered a comment and ignored. 518 * 519 * This is probably not the best way to do this, but it preserves 520 * the old semantics where if a user was listed in the file he was 521 * denied, otherwise he was allowed. 522 * 523 * There is one change in the semantics, however; ftpd will now `fail 524 * safe' and deny all access if there's no /etc/ftpusers file. 525 * 526 * Return 1 if the user is denied, or 0 if he is allowed. 527 */ 528 static int 529 checkaccess(name) 530 char *name; 531 { 532 #define ALLOWED 0 533 #define NOT_ALLOWED 1 534 FILE *fd; 535 int retval = ALLOWED; 536 char *glob, *perm, line[BUFSIZ]; 537 538 if ((fd = fopen(conffilename(_PATH_FTPUSERS), "r")) == NULL) 539 return NOT_ALLOWED; 540 541 while (fgets(line, sizeof(line), fd) != NULL) { 542 glob = strtok(line, " \t\n"); 543 if (glob[0] == '#') 544 continue; 545 perm = strtok(NULL, " \t\n"); 546 if (fnmatch(glob, name, 0) == 0) { 547 if (perm != NULL && strcmp(perm, "allow") == 0) 548 retval = ALLOWED; 549 else 550 retval = NOT_ALLOWED; 551 break; 552 } 553 } 554 (void) fclose(fd); 555 return (retval); 556 } 557 #undef ALLOWED 558 #undef NOT_ALLOWED 559 560 /* 561 * Terminate login as previous user, if any, resetting state; 562 * used when USER command is given or login fails. 563 */ 564 static void 565 end_login() 566 { 567 568 (void) seteuid((uid_t)0); 569 if (logged_in) 570 logwtmp(ttyline, "", ""); 571 pw = NULL; 572 logged_in = 0; 573 guest = 0; 574 dochroot = 0; 575 } 576 577 void 578 pass(passwd) 579 char *passwd; 580 { 581 int rval; 582 FILE *fd; 583 char *cp, *shell; 584 585 if (logged_in || askpasswd == 0) { 586 reply(503, "Login with USER first."); 587 return; 588 } 589 askpasswd = 0; 590 if (!guest) { /* "ftp" is only account allowed no password */ 591 if (pw == NULL) { 592 rval = 1; /* failure below */ 593 goto skip; 594 } 595 #ifdef KERBEROS 596 if (klogin(pw, "", hostname, passwd) == 0) { 597 rval = 0; 598 goto skip; 599 } 600 #endif 601 #ifdef SKEY 602 if (skey_haskey(pw->pw_name) == 0 && 603 skey_passcheck(pw->pw_name, passwd) != -1) { 604 rval = 0; 605 goto skip; 606 } 607 #endif 608 if (*pw->pw_passwd != '\0' && 609 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 610 rval = 0; 611 goto skip; 612 } 613 rval = 1; 614 615 skip: 616 /* 617 * If rval == 1, the user failed the authentication check 618 * above. If rval == 0, either Kerberos or local authentication 619 * succeeded. 620 */ 621 if (rval) { 622 reply(530, "Login incorrect."); 623 if (logging) { 624 syslog(LOG_NOTICE, 625 "FTP LOGIN FAILED FROM %s", remotehost); 626 syslog(LOG_AUTHPRIV | LOG_NOTICE, 627 "FTP LOGIN FAILED FROM %s, %s", 628 remotehost, curname); 629 } 630 pw = NULL; 631 if (login_attempts++ >= 5) { 632 syslog(LOG_NOTICE, 633 "repeated login failures from %s", 634 remotehost); 635 exit(0); 636 } 637 return; 638 } 639 } 640 641 /* password was ok; see if anything else prevents login */ 642 if (checkaccess(pw->pw_name)) { 643 reply(530, "User %s may not use FTP.", pw->pw_name); 644 if (logging) 645 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 646 remotehost, pw->pw_name); 647 pw = (struct passwd *) NULL; 648 return; 649 } 650 /* check for valid shell, if not guest user */ 651 if ((shell = pw->pw_shell) == NULL || *shell == 0) 652 shell = _PATH_BSHELL; 653 while ((cp = getusershell()) != NULL) 654 if (strcmp(cp, shell) == 0) 655 break; 656 endusershell(); 657 if (cp == NULL && guest == 0) { 658 reply(530, "User %s may not use FTP.", pw->pw_name); 659 if (logging) 660 syslog(LOG_NOTICE, 661 "FTP LOGIN REFUSED FROM %s, %s", 662 remotehost, pw->pw_name); 663 pw = (struct passwd *) NULL; 664 return; 665 } 666 667 login_attempts = 0; /* this time successful */ 668 if (setegid((gid_t)pw->pw_gid) < 0) { 669 reply(550, "Can't set gid."); 670 return; 671 } 672 (void) initgroups(pw->pw_name, pw->pw_gid); 673 674 /* open wtmp before chroot */ 675 logwtmp(ttyline, pw->pw_name, remotehost); 676 logged_in = 1; 677 678 dochroot = checkuser(conffilename(_PATH_FTPCHROOT), pw->pw_name); 679 680 /* parse ftpd.conf, setting up various parameters */ 681 if (guest) 682 parse_conf(CLASS_GUEST); 683 else if (dochroot) 684 parse_conf(CLASS_CHROOT); 685 else 686 parse_conf(CLASS_REAL); 687 688 if (guest) { 689 /* 690 * We MUST do a chdir() after the chroot. Otherwise 691 * the old current directory will be accessible as "." 692 * outside the new root! 693 */ 694 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 695 chdir("/") < 0) { 696 reply(550, "Can't set guest privileges."); 697 goto bad; 698 } 699 } else if (dochroot) { 700 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 701 reply(550, "Can't change root."); 702 goto bad; 703 } 704 } else if (chdir(pw->pw_dir) < 0) { 705 if (chdir("/") < 0) { 706 reply(530, "User %s: can't change directory to %s.", 707 pw->pw_name, pw->pw_dir); 708 goto bad; 709 } else 710 lreply(230, "No directory! Logging in with home=/"); 711 } 712 if (seteuid((uid_t)pw->pw_uid) < 0) { 713 reply(550, "Can't set uid."); 714 goto bad; 715 } 716 /* 717 * Display a login message, if it exists. 718 * N.B. reply(230,) must follow the message. 719 */ 720 if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) { 721 char *cp, line[LINE_MAX]; 722 723 while (fgets(line, sizeof(line), fd) != NULL) { 724 if ((cp = strchr(line, '\n')) != NULL) 725 *cp = '\0'; 726 lreply(230, "%s", line); 727 } 728 (void) fflush(stdout); 729 (void) fclose(fd); 730 } 731 show_chdir_messages(230); 732 if (guest) { 733 reply(230, "Guest login ok, access restrictions apply."); 734 #ifdef HASSETPROCTITLE 735 snprintf(proctitle, sizeof(proctitle), 736 "%s: anonymous/%.*s", remotehost, 737 (int) (sizeof(proctitle) - sizeof(remotehost) - 738 sizeof(": anonymous/")), passwd); 739 setproctitle(proctitle); 740 #endif /* HASSETPROCTITLE */ 741 if (logging) 742 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 743 remotehost, passwd); 744 } else { 745 reply(230, "User %s logged in.", pw->pw_name); 746 #ifdef HASSETPROCTITLE 747 snprintf(proctitle, sizeof(proctitle), 748 "%s: %s", remotehost, pw->pw_name); 749 setproctitle(proctitle); 750 #endif /* HASSETPROCTITLE */ 751 if (logging) 752 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 753 remotehost, pw->pw_name); 754 } 755 (void) umask(curclass.umask); 756 return; 757 bad: 758 /* Forget all about it... */ 759 end_login(); 760 } 761 762 void 763 retrieve(cmd, name) 764 char *cmd, *name; 765 { 766 FILE *fin = NULL, *dout; 767 struct stat st; 768 int (*closefunc) __P((FILE *)) = NULL; 769 int log; 770 771 log = (cmd == 0); 772 if (cmd == 0) { 773 fin = fopen(name, "r"), closefunc = fclose; 774 if (fin == NULL) 775 cmd = do_conversion(name); 776 } 777 if (cmd) { 778 char line[BUFSIZ]; 779 780 (void)snprintf(line, sizeof(line), cmd, name), name = line; 781 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 782 st.st_size = -1; 783 st.st_blksize = BUFSIZ; 784 } 785 if (fin == NULL) { 786 if (errno != 0) { 787 perror_reply(550, name); 788 if (log) { 789 LOGCMD("get", name); 790 } 791 } 792 return; 793 } 794 byte_count = -1; 795 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 796 reply(550, "%s: not a plain file.", name); 797 goto done; 798 } 799 if (restart_point) { 800 if (type == TYPE_A) { 801 off_t i, n; 802 int c; 803 804 n = restart_point; 805 i = 0; 806 while (i++ < n) { 807 if ((c=getc(fin)) == EOF) { 808 perror_reply(550, name); 809 goto done; 810 } 811 if (c == '\n') 812 i++; 813 } 814 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 815 perror_reply(550, name); 816 goto done; 817 } 818 } 819 dout = dataconn(name, st.st_size, "w"); 820 if (dout == NULL) 821 goto done; 822 send_data(fin, dout, st.st_blksize); 823 (void) fclose(dout); 824 data = -1; 825 pdata = -1; 826 done: 827 if (log) 828 LOGBYTES("get", name, byte_count); 829 (*closefunc)(fin); 830 } 831 832 void 833 store(name, mode, unique) 834 char *name, *mode; 835 int unique; 836 { 837 FILE *fout, *din; 838 struct stat st; 839 int (*closefunc) __P((FILE *)); 840 841 if (unique && stat(name, &st) == 0 && 842 (name = gunique(name)) == NULL) { 843 LOGCMD(*mode == 'w' ? "put" : "append", name); 844 return; 845 } 846 847 if (restart_point) 848 mode = "r+"; 849 fout = fopen(name, mode); 850 closefunc = fclose; 851 if (fout == NULL) { 852 perror_reply(553, name); 853 LOGCMD(*mode == 'w' ? "put" : "append", name); 854 return; 855 } 856 byte_count = -1; 857 if (restart_point) { 858 if (type == TYPE_A) { 859 off_t i, n; 860 int c; 861 862 n = restart_point; 863 i = 0; 864 while (i++ < n) { 865 if ((c=getc(fout)) == EOF) { 866 perror_reply(550, name); 867 goto done; 868 } 869 if (c == '\n') 870 i++; 871 } 872 /* 873 * We must do this seek to "current" position 874 * because we are changing from reading to 875 * writing. 876 */ 877 if (fseek(fout, 0L, SEEK_CUR) < 0) { 878 perror_reply(550, name); 879 goto done; 880 } 881 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 882 perror_reply(550, name); 883 goto done; 884 } 885 } 886 din = dataconn(name, (off_t)-1, "r"); 887 if (din == NULL) 888 goto done; 889 if (receive_data(din, fout) == 0) { 890 if (unique) 891 reply(226, "Transfer complete (unique file name:%s).", 892 name); 893 else 894 reply(226, "Transfer complete."); 895 } 896 (void) fclose(din); 897 data = -1; 898 pdata = -1; 899 done: 900 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 901 (*closefunc)(fout); 902 } 903 904 static FILE * 905 getdatasock(mode) 906 char *mode; 907 { 908 int on = 1, s, t, tries; 909 910 if (data >= 0) 911 return (fdopen(data, mode)); 912 (void) seteuid((uid_t)0); 913 s = socket(AF_INET, SOCK_STREAM, 0); 914 if (s < 0) 915 goto bad; 916 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 917 (char *) &on, sizeof(on)) < 0) 918 goto bad; 919 /* anchor socket to avoid multi-homing problems */ 920 data_source.sin_len = sizeof(struct sockaddr_in); 921 data_source.sin_family = AF_INET; 922 data_source.sin_addr = ctrl_addr.sin_addr; 923 for (tries = 1; ; tries++) { 924 if (bind(s, (struct sockaddr *)&data_source, 925 sizeof(data_source)) >= 0) 926 break; 927 if (errno != EADDRINUSE || tries > 10) 928 goto bad; 929 sleep(tries); 930 } 931 (void) seteuid((uid_t)pw->pw_uid); 932 #ifdef IP_TOS 933 on = IPTOS_THROUGHPUT; 934 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 935 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 936 #endif 937 return (fdopen(s, mode)); 938 bad: 939 /* Return the real value of errno (close may change it) */ 940 t = errno; 941 (void) seteuid((uid_t)pw->pw_uid); 942 (void) close(s); 943 errno = t; 944 return (NULL); 945 } 946 947 static FILE * 948 dataconn(name, size, mode) 949 char *name; 950 off_t size; 951 char *mode; 952 { 953 char sizebuf[32]; 954 FILE *file; 955 int retry = 0, tos; 956 957 file_size = size; 958 byte_count = 0; 959 if (size != (off_t) -1) 960 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 961 (long long)size); 962 else 963 sizebuf[0] = '\0'; 964 if (pdata >= 0) { 965 struct sockaddr_in from; 966 int s, fromlen = sizeof(from); 967 968 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 969 if (s < 0) { 970 reply(425, "Can't open data connection."); 971 (void) close(pdata); 972 pdata = -1; 973 return (NULL); 974 } 975 (void) close(pdata); 976 pdata = s; 977 #ifdef IP_TOS 978 tos = IPTOS_THROUGHPUT; 979 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 980 sizeof(int)); 981 #endif 982 reply(150, "Opening %s mode data connection for '%s'%s.", 983 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 984 return (fdopen(pdata, mode)); 985 } 986 if (data >= 0) { 987 reply(125, "Using existing data connection for '%s'%s.", 988 name, sizebuf); 989 usedefault = 1; 990 return (fdopen(data, mode)); 991 } 992 if (usedefault) 993 data_dest = his_addr; 994 usedefault = 1; 995 file = getdatasock(mode); 996 if (file == NULL) { 997 reply(425, "Can't create data socket (%s,%d): %s.", 998 inet_ntoa(data_source.sin_addr), 999 ntohs(data_source.sin_port), strerror(errno)); 1000 return (NULL); 1001 } 1002 data = fileno(file); 1003 while (connect(data, (struct sockaddr *)&data_dest, 1004 sizeof(data_dest)) < 0) { 1005 if (errno == EADDRINUSE && retry < swaitmax) { 1006 sleep((unsigned) swaitint); 1007 retry += swaitint; 1008 continue; 1009 } 1010 perror_reply(425, "Can't build data connection"); 1011 (void) fclose(file); 1012 data = -1; 1013 return (NULL); 1014 } 1015 reply(150, "Opening %s mode data connection for '%s'%s.", 1016 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1017 return (file); 1018 } 1019 1020 /* 1021 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1022 * encapsulation of the data subject * to Mode, Structure, and Type. 1023 * 1024 * NB: Form isn't handled. 1025 */ 1026 static void 1027 send_data(instr, outstr, blksize) 1028 FILE *instr, *outstr; 1029 off_t blksize; 1030 { 1031 int c, cnt, filefd, netfd; 1032 char *buf; 1033 1034 transflag++; 1035 if (setjmp(urgcatch)) { 1036 transflag = 0; 1037 return; 1038 } 1039 1040 switch (type) { 1041 1042 case TYPE_A: 1043 while ((c = getc(instr)) != EOF) { 1044 byte_count++; 1045 if (c == '\n') { 1046 if (ferror(outstr)) 1047 goto data_err; 1048 (void) putc('\r', outstr); 1049 } 1050 (void) putc(c, outstr); 1051 } 1052 fflush(outstr); 1053 transflag = 0; 1054 if (ferror(instr)) 1055 goto file_err; 1056 if (ferror(outstr)) 1057 goto data_err; 1058 reply(226, "Transfer complete."); 1059 return; 1060 1061 case TYPE_I: 1062 case TYPE_L: 1063 if ((buf = malloc((u_int)blksize)) == NULL) { 1064 transflag = 0; 1065 perror_reply(451, "Local resource failure: malloc"); 1066 return; 1067 } 1068 netfd = fileno(outstr); 1069 filefd = fileno(instr); 1070 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1071 write(netfd, buf, cnt) == cnt) 1072 byte_count += cnt; 1073 transflag = 0; 1074 (void)free(buf); 1075 if (cnt != 0) { 1076 if (cnt < 0) 1077 goto file_err; 1078 goto data_err; 1079 } 1080 reply(226, "Transfer complete."); 1081 return; 1082 default: 1083 transflag = 0; 1084 reply(550, "Unimplemented TYPE %d in send_data", type); 1085 return; 1086 } 1087 1088 data_err: 1089 transflag = 0; 1090 perror_reply(426, "Data connection"); 1091 return; 1092 1093 file_err: 1094 transflag = 0; 1095 perror_reply(551, "Error on input file"); 1096 } 1097 1098 /* 1099 * Transfer data from peer to "outstr" using the appropriate encapulation of 1100 * the data subject to Mode, Structure, and Type. 1101 * 1102 * N.B.: Form isn't handled. 1103 */ 1104 static int 1105 receive_data(instr, outstr) 1106 FILE *instr, *outstr; 1107 { 1108 int c, cnt, bare_lfs; 1109 char buf[BUFSIZ]; 1110 #ifdef __GNUC__ 1111 (void) &bare_lfs; 1112 #endif 1113 1114 bare_lfs = 0; 1115 transflag++; 1116 if (setjmp(urgcatch)) { 1117 transflag = 0; 1118 return (-1); 1119 } 1120 1121 switch (type) { 1122 1123 case TYPE_I: 1124 case TYPE_L: 1125 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1126 if (write(fileno(outstr), buf, cnt) != cnt) 1127 goto file_err; 1128 byte_count += cnt; 1129 } 1130 if (cnt < 0) 1131 goto data_err; 1132 transflag = 0; 1133 return (0); 1134 1135 case TYPE_E: 1136 reply(553, "TYPE E not implemented."); 1137 transflag = 0; 1138 return (-1); 1139 1140 case TYPE_A: 1141 while ((c = getc(instr)) != EOF) { 1142 byte_count++; 1143 if (c == '\n') 1144 bare_lfs++; 1145 while (c == '\r') { 1146 if (ferror(outstr)) 1147 goto data_err; 1148 if ((c = getc(instr)) != '\n') { 1149 (void) putc ('\r', outstr); 1150 if (c == '\0' || c == EOF) 1151 goto contin2; 1152 } 1153 } 1154 (void) putc(c, outstr); 1155 contin2: ; 1156 } 1157 fflush(outstr); 1158 if (ferror(instr)) 1159 goto data_err; 1160 if (ferror(outstr)) 1161 goto file_err; 1162 transflag = 0; 1163 if (bare_lfs) { 1164 lreply(226, 1165 "WARNING! %d bare linefeeds received in ASCII mode", 1166 bare_lfs); 1167 (void)printf(" File may not have transferred correctly.\r\n"); 1168 } 1169 return (0); 1170 default: 1171 reply(550, "Unimplemented TYPE %d in receive_data", type); 1172 transflag = 0; 1173 return (-1); 1174 } 1175 1176 data_err: 1177 transflag = 0; 1178 perror_reply(426, "Data Connection"); 1179 return (-1); 1180 1181 file_err: 1182 transflag = 0; 1183 perror_reply(452, "Error writing file"); 1184 return (-1); 1185 } 1186 1187 void 1188 statfilecmd(filename) 1189 char *filename; 1190 { 1191 FILE *fin; 1192 int c; 1193 char line[LINE_MAX]; 1194 1195 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1196 fin = ftpd_popen(line, "r", 0); 1197 lreply(211, "status of %s:", filename); 1198 while ((c = getc(fin)) != EOF) { 1199 if (c == '\n') { 1200 if (ferror(stdout)){ 1201 perror_reply(421, "control connection"); 1202 (void) ftpd_pclose(fin); 1203 dologout(1); 1204 /* NOTREACHED */ 1205 } 1206 if (ferror(fin)) { 1207 perror_reply(551, filename); 1208 (void) ftpd_pclose(fin); 1209 return; 1210 } 1211 (void) putc('\r', stdout); 1212 } 1213 (void) putc(c, stdout); 1214 } 1215 (void) ftpd_pclose(fin); 1216 reply(211, "End of Status"); 1217 } 1218 1219 void 1220 statcmd() 1221 { 1222 struct sockaddr_in *sin; 1223 u_char *a, *p; 1224 1225 lreply(211, "%s FTP server status:", hostname); 1226 lreply(211, "%s", version); 1227 if (isdigit(remotehost[0])) 1228 lreply(211, "Connected to %s", remotehost); 1229 else 1230 lreply(211, "Connected to %s (%s)", remotehost, 1231 inet_ntoa(his_addr.sin_addr)); 1232 if (logged_in) { 1233 if (guest) 1234 lreply(211, "Logged in anonymously"); 1235 else 1236 lreply(211, "Logged in as %s", pw->pw_name); 1237 } else if (askpasswd) 1238 lreply(211, "Waiting for password"); 1239 else 1240 lreply(211, "Waiting for user name"); 1241 printf("211- TYPE: %s", typenames[type]); 1242 if (type == TYPE_A || type == TYPE_E) 1243 printf(", FORM: %s", formnames[form]); 1244 if (type == TYPE_L) 1245 #if NBBY == 8 1246 printf(" %d", NBBY); 1247 #else 1248 printf(" %d", bytesize); /* need definition! */ 1249 #endif 1250 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1251 strunames[stru], modenames[mode]); 1252 if (data != -1) 1253 lreply(211, "Data connection open"); 1254 else if (pdata != -1) { 1255 printf("211- in Passive mode"); 1256 sin = &pasv_addr; 1257 goto printaddr; 1258 } else if (usedefault == 0) { 1259 printf("211- PORT"); 1260 sin = &data_dest; 1261 printaddr: 1262 a = (u_char *) &sin->sin_addr; 1263 p = (u_char *) &sin->sin_port; 1264 #define UC(b) (((int) b) & 0xff) 1265 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1266 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1267 #undef UC 1268 } else 1269 lreply(211, "No data connection"); 1270 1271 if (logged_in) { 1272 struct ftpconv *cp; 1273 1274 lreply(211, ""); 1275 lreply(211, "Class: %s", curclass.classname); 1276 if (curclass.display) 1277 lreply(211, "Display file: %s", curclass.display); 1278 if (curclass.notify) 1279 lreply(211, "Notify fileglob: %s", curclass.notify); 1280 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1281 curclass.timeout, curclass.maxtimeout); 1282 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1283 curclass.modify ? "en" : "dis"); 1284 lreply(211, "Umask: %.04o", curclass.umask); 1285 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1286 if (cp->suffix == NULL || cp->types == NULL || 1287 cp->command == NULL) 1288 continue; 1289 lreply(211, 1290 "Conversion: %s [%s] disable: %s, command: %s", 1291 cp->suffix, cp->types, cp->disable, cp->command); 1292 } 1293 } 1294 1295 reply(211, "End of status"); 1296 } 1297 1298 void 1299 fatal(s) 1300 char *s; 1301 { 1302 1303 reply(451, "Error in server: %s\n", s); 1304 reply(221, "Closing connection due to server error."); 1305 dologout(0); 1306 /* NOTREACHED */ 1307 } 1308 1309 void 1310 #if __STDC__ 1311 reply(int n, const char *fmt, ...) 1312 #else 1313 reply(n, fmt, va_alist) 1314 int n; 1315 char *fmt; 1316 va_dcl 1317 #endif 1318 { 1319 va_list ap; 1320 #if __STDC__ 1321 va_start(ap, fmt); 1322 #else 1323 va_start(ap); 1324 #endif 1325 (void)printf("%d ", n); 1326 (void)vprintf(fmt, ap); 1327 (void)printf("\r\n"); 1328 (void)fflush(stdout); 1329 if (debug) { 1330 syslog(LOG_DEBUG, "<--- %d ", n); 1331 vsyslog(LOG_DEBUG, fmt, ap); 1332 } 1333 } 1334 1335 void 1336 #if __STDC__ 1337 lreply(int n, const char *fmt, ...) 1338 #else 1339 lreply(n, fmt, va_alist) 1340 int n; 1341 char *fmt; 1342 va_dcl 1343 #endif 1344 { 1345 va_list ap; 1346 #if __STDC__ 1347 va_start(ap, fmt); 1348 #else 1349 va_start(ap); 1350 #endif 1351 (void)printf("%d- ", n); 1352 (void)vprintf(fmt, ap); 1353 (void)printf("\r\n"); 1354 (void)fflush(stdout); 1355 if (debug) { 1356 syslog(LOG_DEBUG, "<--- %d- ", n); 1357 vsyslog(LOG_DEBUG, fmt, ap); 1358 } 1359 } 1360 1361 static void 1362 ack(s) 1363 char *s; 1364 { 1365 1366 reply(250, "%s command successful.", s); 1367 } 1368 1369 void 1370 nack(s) 1371 char *s; 1372 { 1373 1374 reply(502, "%s command not implemented.", s); 1375 } 1376 1377 /* ARGSUSED */ 1378 void 1379 yyerror(s) 1380 char *s; 1381 { 1382 char *cp; 1383 1384 if ((cp = strchr(cbuf,'\n')) != NULL) 1385 *cp = '\0'; 1386 reply(500, "'%s': command not understood.", cbuf); 1387 } 1388 1389 void 1390 delete(name) 1391 char *name; 1392 { 1393 struct stat st; 1394 1395 LOGCMD("delete", name); 1396 if (stat(name, &st) < 0) { 1397 perror_reply(550, name); 1398 return; 1399 } 1400 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1401 if (rmdir(name) < 0) { 1402 perror_reply(550, name); 1403 return; 1404 } 1405 goto done; 1406 } 1407 if (unlink(name) < 0) { 1408 perror_reply(550, name); 1409 return; 1410 } 1411 done: 1412 ack("DELE"); 1413 } 1414 1415 void 1416 cwd(path) 1417 char *path; 1418 { 1419 1420 if (chdir(path) < 0) 1421 perror_reply(550, path); 1422 else { 1423 show_chdir_messages(250); 1424 ack("CWD"); 1425 } 1426 } 1427 1428 static void 1429 replydirname(name, message) 1430 const char *name, *message; 1431 { 1432 char npath[MAXPATHLEN + 1]; 1433 int i; 1434 1435 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1436 npath[i] = *name; 1437 if (*name == '"') 1438 npath[++i] = '"'; 1439 } 1440 npath[i] = '\0'; 1441 reply(257, "\"%s\" %s", npath, message); 1442 } 1443 1444 void 1445 makedir(name) 1446 char *name; 1447 { 1448 1449 LOGCMD("mkdir", name); 1450 if (mkdir(name, 0777) < 0) 1451 perror_reply(550, name); 1452 else 1453 replydirname(name, "directory created."); 1454 } 1455 1456 void 1457 removedir(name) 1458 char *name; 1459 { 1460 1461 LOGCMD("rmdir", name); 1462 if (rmdir(name) < 0) 1463 perror_reply(550, name); 1464 else 1465 ack("RMD"); 1466 } 1467 1468 void 1469 pwd() 1470 { 1471 char path[MAXPATHLEN + 1]; 1472 1473 if (getcwd(path, sizeof(path) - 1) == NULL) 1474 reply(550, "%s.", path); 1475 else 1476 replydirname(path, "is the current directory."); 1477 } 1478 1479 char * 1480 renamefrom(name) 1481 char *name; 1482 { 1483 struct stat st; 1484 1485 if (stat(name, &st) < 0) { 1486 perror_reply(550, name); 1487 return ((char *)0); 1488 } 1489 reply(350, "File exists, ready for destination name"); 1490 return (name); 1491 } 1492 1493 void 1494 renamecmd(from, to) 1495 char *from, *to; 1496 { 1497 1498 LOGCMD2("rename", from, to); 1499 if (rename(from, to) < 0) 1500 perror_reply(550, "rename"); 1501 else 1502 ack("RNTO"); 1503 } 1504 1505 static void 1506 dolog(sin) 1507 struct sockaddr_in *sin; 1508 { 1509 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1510 sizeof(struct in_addr), AF_INET); 1511 1512 if (hp) 1513 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1514 else 1515 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1516 sizeof(remotehost)); 1517 #ifdef HASSETPROCTITLE 1518 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1519 setproctitle(proctitle); 1520 #endif /* HASSETPROCTITLE */ 1521 1522 if (logging) 1523 syslog(LOG_INFO, "connection from %s", remotehost); 1524 } 1525 1526 /* 1527 * Record logout in wtmp file 1528 * and exit with supplied status. 1529 */ 1530 void 1531 dologout(status) 1532 int status; 1533 { 1534 /* 1535 * Prevent reception of SIGURG from resulting in a resumption 1536 * back to the main program loop. 1537 */ 1538 transflag = 0; 1539 1540 if (logged_in) { 1541 (void) seteuid((uid_t)0); 1542 logwtmp(ttyline, "", ""); 1543 #ifdef KERBEROS 1544 if (!notickets && krbtkfile_env) 1545 unlink(krbtkfile_env); 1546 #endif 1547 } 1548 /* beware of flushing buffers after a SIGPIPE */ 1549 _exit(status); 1550 } 1551 1552 static void 1553 myoob(signo) 1554 int signo; 1555 { 1556 char *cp; 1557 1558 /* only process if transfer occurring */ 1559 if (!transflag) 1560 return; 1561 cp = tmpline; 1562 if (getline(cp, 7, stdin) == NULL) { 1563 reply(221, "You could at least say goodbye."); 1564 dologout(0); 1565 } 1566 upper(cp); 1567 if (strcmp(cp, "ABOR\r\n") == 0) { 1568 tmpline[0] = '\0'; 1569 reply(426, "Transfer aborted. Data connection closed."); 1570 reply(226, "Abort successful"); 1571 longjmp(urgcatch, 1); 1572 } 1573 if (strcmp(cp, "STAT\r\n") == 0) { 1574 if (file_size != (off_t) -1) 1575 reply(213, "Status: %qd of %qd bytes transferred", 1576 byte_count, file_size); 1577 else 1578 reply(213, "Status: %qd bytes transferred", byte_count); 1579 } 1580 } 1581 1582 /* 1583 * Note: a response of 425 is not mentioned as a possible response to 1584 * the PASV command in RFC959. However, it has been blessed as 1585 * a legitimate response by Jon Postel in a telephone conversation 1586 * with Rick Adams on 25 Jan 89. 1587 */ 1588 void 1589 passive() 1590 { 1591 int len; 1592 char *p, *a; 1593 1594 pdata = socket(AF_INET, SOCK_STREAM, 0); 1595 if (pdata < 0 || !logged_in) { 1596 perror_reply(425, "Can't open passive connection"); 1597 return; 1598 } 1599 pasv_addr = ctrl_addr; 1600 pasv_addr.sin_port = 0; 1601 (void) seteuid((uid_t)0); 1602 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1603 (void) seteuid((uid_t)pw->pw_uid); 1604 goto pasv_error; 1605 } 1606 (void) seteuid((uid_t)pw->pw_uid); 1607 len = sizeof(pasv_addr); 1608 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1609 goto pasv_error; 1610 if (listen(pdata, 1) < 0) 1611 goto pasv_error; 1612 a = (char *) &pasv_addr.sin_addr; 1613 p = (char *) &pasv_addr.sin_port; 1614 1615 #define UC(b) (((int) b) & 0xff) 1616 1617 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1618 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1619 return; 1620 1621 pasv_error: 1622 (void) close(pdata); 1623 pdata = -1; 1624 perror_reply(425, "Can't open passive connection"); 1625 return; 1626 } 1627 1628 /* 1629 * Generate unique name for file with basename "local". 1630 * The file named "local" is already known to exist. 1631 * Generates failure reply on error. 1632 * 1633 * XXX this function should under go changes similar to 1634 * the mktemp(3)/mkstemp(3) changes. 1635 */ 1636 static char * 1637 gunique(local) 1638 char *local; 1639 { 1640 static char new[MAXPATHLEN]; 1641 struct stat st; 1642 int count, len; 1643 char *cp; 1644 1645 cp = strrchr(local, '/'); 1646 if (cp) 1647 *cp = '\0'; 1648 if (stat(cp ? local : ".", &st) < 0) { 1649 perror_reply(553, cp ? local : "."); 1650 return ((char *) 0); 1651 } 1652 if (cp) 1653 *cp = '/'; 1654 (void) strcpy(new, local); 1655 len = strlen(new); 1656 cp = new + len; 1657 *cp++ = '.'; 1658 for (count = 1; count < 100; count++) { 1659 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1660 if (stat(new, &st) < 0) 1661 return (new); 1662 } 1663 reply(452, "Unique file name cannot be created."); 1664 return (NULL); 1665 } 1666 1667 /* 1668 * Format and send reply containing system error number. 1669 */ 1670 void 1671 perror_reply(code, string) 1672 int code; 1673 char *string; 1674 { 1675 1676 reply(code, "%s: %s.", string, strerror(errno)); 1677 } 1678 1679 static char *onefile[] = { 1680 "", 1681 0 1682 }; 1683 1684 void 1685 send_file_list(whichf) 1686 char *whichf; 1687 { 1688 struct stat st; 1689 DIR *dirp = NULL; 1690 struct dirent *dir; 1691 FILE *dout = NULL; 1692 char **dirlist, *dirname; 1693 int simple = 0; 1694 int freeglob = 0; 1695 glob_t gl; 1696 #ifdef __GNUC__ 1697 (void) &dout; 1698 (void) &dirlist; 1699 (void) &simple; 1700 (void) &freeglob; 1701 #endif 1702 1703 if (strpbrk(whichf, "~{[*?") != NULL) { 1704 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1705 1706 memset(&gl, 0, sizeof(gl)); 1707 freeglob = 1; 1708 if (glob(whichf, flags, 0, &gl)) { 1709 reply(550, "not found"); 1710 goto out; 1711 } else if (gl.gl_pathc == 0) { 1712 errno = ENOENT; 1713 perror_reply(550, whichf); 1714 goto out; 1715 } 1716 dirlist = gl.gl_pathv; 1717 } else { 1718 onefile[0] = whichf; 1719 dirlist = onefile; 1720 simple = 1; 1721 } 1722 1723 if (setjmp(urgcatch)) { 1724 transflag = 0; 1725 goto out; 1726 } 1727 while ((dirname = *dirlist++) != NULL) { 1728 int trailingslash = 0; 1729 1730 if (stat(dirname, &st) < 0) { 1731 /* 1732 * If user typed "ls -l", etc, and the client 1733 * used NLST, do what the user meant. 1734 */ 1735 if (dirname[0] == '-' && *dirlist == NULL && 1736 transflag == 0) { 1737 retrieve("/bin/ls %s", dirname); 1738 goto out; 1739 } 1740 perror_reply(550, whichf); 1741 if (dout != NULL) { 1742 (void) fclose(dout); 1743 transflag = 0; 1744 data = -1; 1745 pdata = -1; 1746 } 1747 goto out; 1748 } 1749 1750 if (S_ISREG(st.st_mode)) { 1751 if (dout == NULL) { 1752 dout = dataconn("file list", (off_t)-1, "w"); 1753 if (dout == NULL) 1754 goto out; 1755 transflag++; 1756 } 1757 fprintf(dout, "%s%s\n", dirname, 1758 type == TYPE_A ? "\r" : ""); 1759 byte_count += strlen(dirname) + 1; 1760 continue; 1761 } else if (!S_ISDIR(st.st_mode)) 1762 continue; 1763 1764 if (dirname[strlen(dirname) - 1] == '/') 1765 trailingslash++; 1766 1767 if ((dirp = opendir(dirname)) == NULL) 1768 continue; 1769 1770 while ((dir = readdir(dirp)) != NULL) { 1771 char nbuf[MAXPATHLEN]; 1772 1773 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1774 continue; 1775 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1776 dir->d_namlen == 2) 1777 continue; 1778 1779 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1780 trailingslash ? "" : "/", dir->d_name); 1781 1782 /* 1783 * We have to do a stat to ensure it's 1784 * not a directory or special file. 1785 */ 1786 if (simple || (stat(nbuf, &st) == 0 && 1787 S_ISREG(st.st_mode))) { 1788 if (dout == NULL) { 1789 dout = dataconn("file list", (off_t)-1, 1790 "w"); 1791 if (dout == NULL) 1792 goto out; 1793 transflag++; 1794 } 1795 if (nbuf[0] == '.' && nbuf[1] == '/') 1796 fprintf(dout, "%s%s\n", &nbuf[2], 1797 type == TYPE_A ? "\r" : ""); 1798 else 1799 fprintf(dout, "%s%s\n", nbuf, 1800 type == TYPE_A ? "\r" : ""); 1801 byte_count += strlen(nbuf) + 1; 1802 } 1803 } 1804 (void) closedir(dirp); 1805 } 1806 1807 if (dout == NULL) 1808 reply(550, "No files found."); 1809 else if (ferror(dout) != 0) 1810 perror_reply(550, "Data connection"); 1811 else 1812 reply(226, "Transfer complete."); 1813 1814 transflag = 0; 1815 if (dout != NULL) 1816 (void) fclose(dout); 1817 data = -1; 1818 pdata = -1; 1819 out: 1820 if (freeglob) { 1821 freeglob = 0; 1822 globfree(&gl); 1823 } 1824 } 1825 1826 char * 1827 conffilename(s) 1828 const char *s; 1829 { 1830 static char filename[MAXPATHLEN]; 1831 1832 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 1833 return filename; 1834 } 1835
Indexes created Tue Sep 23 02:09:52 GMT 2025