ftpd.c revision 1.33
1 /* $NetBSD: ftpd.c,v 1.33 1997/09/18 07:27:35 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 1.33 1997/09/18 07:27:35 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 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; 135 136 extern struct ftpclass curclass; 137 138 #if defined(KERBEROS) 139 int notickets = 1; 140 char *krbtkfile_env = NULL; 141 #endif 142 143 /* 144 * Timeout intervals for retrying connections 145 * to hosts that don't accept PORT cmds. This 146 * is a kludge, but given the problems with TCP... 147 */ 148 #define SWAITMAX 90 /* wait at most 90 seconds */ 149 #define SWAITINT 5 /* interval between retries */ 150 151 int swaitmax = SWAITMAX; 152 int swaitint = SWAITINT; 153 154 #ifdef HASSETPROCTITLE 155 char proctitle[BUFSIZ]; /* initial part of title */ 156 #endif /* HASSETPROCTITLE */ 157 158 #define LOGCMD(cmd, file) \ 159 if (logging > 1) \ 160 syslog(LOG_INFO,"%s %s%s", cmd, \ 161 *(file) == '/' ? "" : curdir(), file); 162 #define LOGCMD2(cmd, file1, file2) \ 163 if (logging > 1) \ 164 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 165 *(file1) == '/' ? "" : curdir(), file1, \ 166 *(file2) == '/' ? "" : curdir(), file2); 167 #define LOGBYTES(cmd, file, cnt) \ 168 if (logging > 1) { \ 169 if (cnt == (off_t)-1) \ 170 syslog(LOG_INFO,"%s %s%s", cmd, \ 171 *(file) == '/' ? "" : curdir(), file); \ 172 else \ 173 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 174 cmd, (*(file) == '/') ? "" : curdir(), file, \ 175 (long long)cnt); \ 176 } 177 178 static void ack __P((char *)); 179 static void myoob __P((int)); 180 static int checkuser __P((char *, char *)); 181 static int checkaccess __P((char *)); 182 static FILE *dataconn __P((char *, off_t, char *)); 183 static void dolog __P((struct sockaddr_in *)); 184 static char *curdir __P((void)); 185 static void end_login __P((void)); 186 static FILE *getdatasock __P((char *)); 187 static char *gunique __P((char *)); 188 static void lostconn __P((int)); 189 static int receive_data __P((FILE *, FILE *)); 190 static void replydirname __P((const char *, const char *)); 191 static void send_data __P((FILE *, FILE *, off_t)); 192 static struct passwd * 193 sgetpwnam __P((char *)); 194 static char *sgetsave __P((char *)); 195 196 int main __P((int, char *[], char **)); 197 198 #if defined (KERBEROS) 199 int klogin __P((struct passwd *, char *, char *, char *)); 200 #endif 201 202 static char * 203 curdir() 204 { 205 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 206 207 if (getcwd(path, sizeof(path)-2) == NULL) 208 return (""); 209 if (path[1] != '\0') /* special case for root dir. */ 210 strcat(path, "/"); 211 /* For guest account, skip / since it's chrooted */ 212 return (guest ? path+1 : path); 213 } 214 215 int 216 main(argc, argv, envp) 217 int argc; 218 char *argv[]; 219 char **envp; 220 { 221 int addrlen, ch, on = 1, tos; 222 char *cp, line[LINE_MAX]; 223 FILE *fd; 224 225 /* 226 * LOG_NDELAY sets up the logging connection immediately, 227 * necessary for anonymous ftp's that chroot and can't do it later. 228 */ 229 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 230 addrlen = sizeof(his_addr); 231 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 232 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 233 exit(1); 234 } 235 addrlen = sizeof(ctrl_addr); 236 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 237 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 238 exit(1); 239 } 240 #ifdef IP_TOS 241 tos = IPTOS_LOWDELAY; 242 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 243 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 244 #endif 245 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 246 debug = 0; 247 248 /* set this here so klogin can use it... */ 249 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 250 251 while ((ch = getopt(argc, argv, "a:dlt:T:u:v")) != EOF) { 252 switch (ch) { 253 case 'a': 254 anondir = optarg; 255 break; 256 257 case 'd': 258 case 'v': /* deprecated */ 259 debug = 1; 260 break; 261 262 case 'l': 263 logging++; /* > 1 == extra logging */ 264 break; 265 266 case 't': 267 case 'T': 268 case 'u': 269 warnx("-%c has been deprecated in favour of ftpd.conf", 270 ch); 271 break; 272 273 default: 274 warnx("unknown flag -%c ignored", optopt); 275 break; 276 } 277 } 278 (void) freopen(_PATH_DEVNULL, "w", stderr); 279 (void) signal(SIGPIPE, lostconn); 280 (void) signal(SIGCHLD, SIG_IGN); 281 if ((long)signal(SIGURG, myoob) < 0) 282 syslog(LOG_ERR, "signal: %m"); 283 284 /* Try to handle urgent data inline */ 285 #ifdef SO_OOBINLINE 286 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 287 syslog(LOG_ERR, "setsockopt: %m"); 288 #endif 289 290 #ifdef F_SETOWN 291 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 292 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 293 #endif 294 dolog(&his_addr); 295 /* 296 * Set up default state 297 */ 298 data = -1; 299 type = TYPE_A; 300 form = FORM_N; 301 stru = STRU_F; 302 mode = MODE_S; 303 tmpline[0] = '\0'; 304 305 /* If logins are disabled, print out the message. */ 306 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 307 while (fgets(line, sizeof(line), fd) != NULL) { 308 if ((cp = strchr(line, '\n')) != NULL) 309 *cp = '\0'; 310 lreply(530, "%s", line); 311 } 312 (void) fflush(stdout); 313 (void) fclose(fd); 314 reply(530, "System not available."); 315 exit(0); 316 } 317 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 318 while (fgets(line, sizeof(line), fd) != NULL) { 319 if ((cp = strchr(line, '\n')) != NULL) 320 *cp = '\0'; 321 lreply(220, "%s", line); 322 } 323 (void) fflush(stdout); 324 (void) fclose(fd); 325 /* reply(220,) must follow */ 326 } 327 (void) gethostname(hostname, sizeof(hostname)); 328 reply(220, "%s FTP server (%s) ready.", hostname, version); 329 (void) setjmp(errcatch); 330 for (;;) 331 (void) yyparse(); 332 /* NOTREACHED */ 333 } 334 335 static void 336 lostconn(signo) 337 int signo; 338 { 339 340 if (debug) 341 syslog(LOG_DEBUG, "lost connection"); 342 dologout(-1); 343 } 344 345 /* 346 * Helper function for sgetpwnam(). 347 */ 348 static char * 349 sgetsave(s) 350 char *s; 351 { 352 char *new = malloc((unsigned) strlen(s) + 1); 353 354 if (new == NULL) { 355 perror_reply(421, "Local resource failure: malloc"); 356 dologout(1); 357 /* NOTREACHED */ 358 } 359 (void) strcpy(new, s); 360 return (new); 361 } 362 363 /* 364 * Save the result of a getpwnam. Used for USER command, since 365 * the data returned must not be clobbered by any other command 366 * (e.g., globbing). 367 */ 368 static struct passwd * 369 sgetpwnam(name) 370 char *name; 371 { 372 static struct passwd save; 373 struct passwd *p; 374 375 if ((p = getpwnam(name)) == NULL) 376 return (p); 377 if (save.pw_name) { 378 free(save.pw_name); 379 free(save.pw_passwd); 380 free(save.pw_gecos); 381 free(save.pw_dir); 382 free(save.pw_shell); 383 } 384 save = *p; 385 save.pw_name = sgetsave(p->pw_name); 386 save.pw_passwd = sgetsave(p->pw_passwd); 387 save.pw_gecos = sgetsave(p->pw_gecos); 388 save.pw_dir = sgetsave(p->pw_dir); 389 save.pw_shell = sgetsave(p->pw_shell); 390 return (&save); 391 } 392 393 static int login_attempts; /* number of failed login attempts */ 394 static int askpasswd; /* had user command, ask for passwd */ 395 static char curname[10]; /* current USER name */ 396 397 /* 398 * USER command. 399 * Sets global passwd pointer pw if named account exists and is acceptable; 400 * sets askpasswd if a PASS command is expected. If logged in previously, 401 * need to reset state. If name is "ftp" or "anonymous", the name is not in 402 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 403 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 404 * requesting login privileges. Disallow anyone who does not have a standard 405 * shell as returned by getusershell(). Disallow anyone mentioned in the file 406 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 407 */ 408 void 409 user(name) 410 char *name; 411 { 412 if (logged_in) { 413 if (guest) { 414 reply(530, "Can't change user from guest login."); 415 return; 416 } else if (dochroot) { 417 reply(530, "Can't change user from chroot user."); 418 return; 419 } 420 end_login(); 421 } 422 423 guest = 0; 424 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 425 if (checkaccess("ftp") || checkaccess("anonymous")) 426 reply(530, "User %s access denied.", name); 427 else if ((pw = sgetpwnam("ftp")) != NULL) { 428 guest = 1; 429 askpasswd = 1; 430 reply(331, 431 "Guest login ok, type your name as password."); 432 } else 433 reply(530, "User %s unknown.", name); 434 if (!askpasswd && logging) 435 syslog(LOG_NOTICE, 436 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 437 return; 438 } 439 pw = sgetpwnam(name); 440 if (logging) 441 strncpy(curname, name, sizeof(curname)-1); 442 #ifdef SKEY 443 if (!skey_haskey(name)) { 444 char *myskey, *skey_keyinfo __P((char *name)); 445 446 myskey = skey_keyinfo(name); 447 reply(331, "Password [%s] for %s required.", 448 myskey ? myskey : "error getting challenge", name); 449 } else 450 #endif 451 reply(331, "Password required for %s.", name); 452 453 askpasswd = 1; 454 /* 455 * Delay before reading passwd after first failed 456 * attempt to slow down passwd-guessing programs. 457 */ 458 if (login_attempts) 459 sleep((unsigned) login_attempts); 460 } 461 462 /* 463 * Check if a user is in the file "fname" 464 */ 465 static int 466 checkuser(fname, name) 467 char *fname; 468 char *name; 469 { 470 FILE *fd; 471 int found = 0; 472 char *p, line[BUFSIZ]; 473 474 if ((fd = fopen(fname, "r")) != NULL) { 475 while (fgets(line, sizeof(line), fd) != NULL) 476 if ((p = strchr(line, '\n')) != NULL) { 477 *p = '\0'; 478 if (line[0] == '#') 479 continue; 480 if (strcmp(line, name) == 0) { 481 found = 1; 482 break; 483 } 484 } 485 (void) fclose(fd); 486 } 487 return (found); 488 } 489 490 /* 491 * Determine whether a user has access, based on information in 492 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 493 * `allow' or `deny' (with deny being the default if anything but 494 * `allow', or nothing at all, is specified). 495 * 496 * Each glob is matched against the username in turn, and the first 497 * match found is used. If no match is found, access is allowed. 498 * 499 * Any line starting with `#' is considered a comment and ignored. 500 * 501 * This is probably not the best way to do this, but it preserves 502 * the old semantics where if a user was listed in the file he was 503 * denied, otherwise he was allowed. 504 * 505 * There is one change in the semantics, however; ftpd will now `fail 506 * safe' and deny all access if there's no /etc/ftpusers file. 507 * 508 * Return 1 if the user is denied, or 0 if he is allowed. 509 */ 510 static int 511 checkaccess(name) 512 char *name; 513 { 514 #define ALLOWED 0 515 #define NOT_ALLOWED 1 516 FILE *fd; 517 int retval = ALLOWED; 518 char *glob, *perm, line[BUFSIZ]; 519 520 if ((fd = fopen(_PATH_FTPUSERS, "r")) == NULL) 521 return NOT_ALLOWED; 522 523 while (fgets(line, sizeof(line), fd) != NULL) { 524 glob = strtok(line, " \t\n"); 525 if (glob[0] == '#') 526 continue; 527 perm = strtok(NULL, " \t\n"); 528 if (fnmatch(glob, name, 0) == 0) { 529 if (perm != NULL && strcmp(perm, "allow") == 0) 530 retval = ALLOWED; 531 else 532 retval = NOT_ALLOWED; 533 break; 534 } 535 } 536 (void) fclose(fd); 537 return (retval); 538 539 } 540 #undef ALLOWED 541 #undef NOT_ALLOWED 542 543 /* 544 * Terminate login as previous user, if any, resetting state; 545 * used when USER command is given or login fails. 546 */ 547 static void 548 end_login() 549 { 550 551 (void) seteuid((uid_t)0); 552 if (logged_in) 553 logwtmp(ttyline, "", ""); 554 pw = NULL; 555 logged_in = 0; 556 guest = 0; 557 dochroot = 0; 558 } 559 560 void 561 pass(passwd) 562 char *passwd; 563 { 564 int rval; 565 FILE *fd; 566 char *cp, *shell; 567 568 if (logged_in || askpasswd == 0) { 569 reply(503, "Login with USER first."); 570 return; 571 } 572 askpasswd = 0; 573 if (!guest) { /* "ftp" is only account allowed no password */ 574 if (pw == NULL) { 575 rval = 1; /* failure below */ 576 goto skip; 577 } 578 #if defined(KERBEROS) 579 rval = klogin(pw, "", hostname, passwd); 580 if (rval == 0) 581 goto skip; 582 #endif 583 #ifdef SKEY 584 if (skey_haskey(pw->pw_name) == 0 && 585 (skey_passcheck(pw->pw_name, passwd) != -1)) { 586 rval = 0; 587 goto skip; 588 } 589 #endif 590 /* the strcmp does not catch null passwords! */ 591 if (pw == NULL || *pw->pw_passwd == '\0' || 592 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 593 rval = 1; /* failure */ 594 goto skip; 595 } 596 rval = 0; 597 598 skip: 599 /* 600 * If rval == 1, the user failed the authentication check 601 * above. If rval == 0, either Kerberos or local authentication 602 * succeeded. 603 */ 604 if (rval) { 605 reply(530, "Login incorrect."); 606 if (logging) { 607 syslog(LOG_NOTICE, 608 "FTP LOGIN FAILED FROM %s", remotehost); 609 syslog(LOG_AUTHPRIV | LOG_NOTICE, 610 "FTP LOGIN FAILED FROM %s, %s", 611 remotehost, curname); 612 } 613 pw = NULL; 614 if (login_attempts++ >= 5) { 615 syslog(LOG_NOTICE, 616 "repeated login failures from %s", 617 remotehost); 618 exit(0); 619 } 620 return; 621 } 622 } 623 624 /* password was ok; see if anything else prevents login */ 625 if (checkaccess(pw->pw_name)) { 626 reply(530, "User %s may not use FTP.", pw->pw_name); 627 if (logging) 628 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 629 remotehost, pw->pw_name); 630 pw = (struct passwd *) NULL; 631 return; 632 } 633 /* check for valid shell, if not guest user */ 634 if ((shell = pw->pw_shell) == NULL || *shell == 0) 635 shell = _PATH_BSHELL; 636 while ((cp = getusershell()) != NULL) 637 if (strcmp(cp, shell) == 0) 638 break; 639 endusershell(); 640 if (cp == NULL && guest == 0) { 641 reply(530, "User %s may not use FTP.", pw->pw_name); 642 if (logging) 643 syslog(LOG_NOTICE, 644 "FTP LOGIN REFUSED FROM %s, %s", 645 remotehost, pw->pw_name); 646 pw = (struct passwd *) NULL; 647 return; 648 } 649 650 login_attempts = 0; /* this time successful */ 651 if (setegid((gid_t)pw->pw_gid) < 0) { 652 reply(550, "Can't set gid."); 653 return; 654 } 655 (void) initgroups(pw->pw_name, pw->pw_gid); 656 657 /* open wtmp before chroot */ 658 logwtmp(ttyline, pw->pw_name, remotehost); 659 logged_in = 1; 660 661 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 662 663 /* parse ftpd.conf, setting up various parameters */ 664 if (guest) 665 parse_conf(CLASS_GUEST); 666 else if (dochroot) 667 parse_conf(CLASS_CHROOT); 668 else 669 parse_conf(CLASS_REAL); 670 671 if (guest) { 672 /* 673 * We MUST do a chdir() after the chroot. Otherwise 674 * the old current directory will be accessible as "." 675 * outside the new root! 676 */ 677 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 678 chdir("/") < 0) { 679 reply(550, "Can't set guest privileges."); 680 goto bad; 681 } 682 } else if (dochroot) { 683 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 684 reply(550, "Can't change root."); 685 goto bad; 686 } 687 } else if (chdir(pw->pw_dir) < 0) { 688 if (chdir("/") < 0) { 689 reply(530, "User %s: can't change directory to %s.", 690 pw->pw_name, pw->pw_dir); 691 goto bad; 692 } else 693 lreply(230, "No directory! Logging in with home=/"); 694 } 695 if (seteuid((uid_t)pw->pw_uid) < 0) { 696 reply(550, "Can't set uid."); 697 goto bad; 698 } 699 /* 700 * Display a login message, if it exists. 701 * N.B. reply(230,) must follow the message. 702 */ 703 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 704 char *cp, line[LINE_MAX]; 705 706 while (fgets(line, sizeof(line), fd) != NULL) { 707 if ((cp = strchr(line, '\n')) != NULL) 708 *cp = '\0'; 709 lreply(230, "%s", line); 710 } 711 (void) fflush(stdout); 712 (void) fclose(fd); 713 } 714 show_chdir_messages(230); 715 if (guest) { 716 reply(230, "Guest login ok, access restrictions apply."); 717 #ifdef HASSETPROCTITLE 718 snprintf(proctitle, sizeof(proctitle), 719 "%s: anonymous/%.*s", remotehost, 720 (int) (sizeof(proctitle) - sizeof(remotehost) - 721 sizeof(": anonymous/")), passwd); 722 setproctitle(proctitle); 723 #endif /* HASSETPROCTITLE */ 724 if (logging) 725 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 726 remotehost, passwd); 727 } else { 728 reply(230, "User %s logged in.", pw->pw_name); 729 #ifdef HASSETPROCTITLE 730 snprintf(proctitle, sizeof(proctitle), 731 "%s: %s", remotehost, pw->pw_name); 732 setproctitle(proctitle); 733 #endif /* HASSETPROCTITLE */ 734 if (logging) 735 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 736 remotehost, pw->pw_name); 737 } 738 (void) umask(curclass.umask); 739 return; 740 bad: 741 /* Forget all about it... */ 742 end_login(); 743 } 744 745 void 746 retrieve(cmd, name) 747 char *cmd, *name; 748 { 749 FILE *fin = NULL, *dout; 750 struct stat st; 751 int (*closefunc) __P((FILE *)) = NULL; 752 int log; 753 754 log = (cmd == 0); 755 if (cmd == 0) { 756 fin = fopen(name, "r"), closefunc = fclose; 757 if (fin == NULL) 758 cmd = do_conversion(name); 759 } 760 if (cmd) { 761 char line[BUFSIZ]; 762 763 (void)snprintf(line, sizeof(line), cmd, name), name = line; 764 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 765 st.st_size = -1; 766 st.st_blksize = BUFSIZ; 767 } 768 if (fin == NULL) { 769 if (errno != 0) { 770 perror_reply(550, name); 771 if (log) { 772 LOGCMD("get", name); 773 } 774 } 775 return; 776 } 777 byte_count = -1; 778 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 779 reply(550, "%s: not a plain file.", name); 780 goto done; 781 } 782 if (restart_point) { 783 if (type == TYPE_A) { 784 off_t i, n; 785 int c; 786 787 n = restart_point; 788 i = 0; 789 while (i++ < n) { 790 if ((c=getc(fin)) == EOF) { 791 perror_reply(550, name); 792 goto done; 793 } 794 if (c == '\n') 795 i++; 796 } 797 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 798 perror_reply(550, name); 799 goto done; 800 } 801 } 802 dout = dataconn(name, st.st_size, "w"); 803 if (dout == NULL) 804 goto done; 805 send_data(fin, dout, st.st_blksize); 806 (void) fclose(dout); 807 data = -1; 808 pdata = -1; 809 done: 810 if (log) 811 LOGBYTES("get", name, byte_count); 812 (*closefunc)(fin); 813 } 814 815 void 816 store(name, mode, unique) 817 char *name, *mode; 818 int unique; 819 { 820 FILE *fout, *din; 821 struct stat st; 822 int (*closefunc) __P((FILE *)); 823 824 if (unique && stat(name, &st) == 0 && 825 (name = gunique(name)) == NULL) { 826 LOGCMD(*mode == 'w' ? "put" : "append", name); 827 return; 828 } 829 830 if (restart_point) 831 mode = "r+"; 832 fout = fopen(name, mode); 833 closefunc = fclose; 834 if (fout == NULL) { 835 perror_reply(553, name); 836 LOGCMD(*mode == 'w' ? "put" : "append", name); 837 return; 838 } 839 byte_count = -1; 840 if (restart_point) { 841 if (type == TYPE_A) { 842 off_t i, n; 843 int c; 844 845 n = restart_point; 846 i = 0; 847 while (i++ < n) { 848 if ((c=getc(fout)) == EOF) { 849 perror_reply(550, name); 850 goto done; 851 } 852 if (c == '\n') 853 i++; 854 } 855 /* 856 * We must do this seek to "current" position 857 * because we are changing from reading to 858 * writing. 859 */ 860 if (fseek(fout, 0L, SEEK_CUR) < 0) { 861 perror_reply(550, name); 862 goto done; 863 } 864 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 865 perror_reply(550, name); 866 goto done; 867 } 868 } 869 din = dataconn(name, (off_t)-1, "r"); 870 if (din == NULL) 871 goto done; 872 if (receive_data(din, fout) == 0) { 873 if (unique) 874 reply(226, "Transfer complete (unique file name:%s).", 875 name); 876 else 877 reply(226, "Transfer complete."); 878 } 879 (void) fclose(din); 880 data = -1; 881 pdata = -1; 882 done: 883 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 884 (*closefunc)(fout); 885 } 886 887 static FILE * 888 getdatasock(mode) 889 char *mode; 890 { 891 int on = 1, s, t, tries; 892 893 if (data >= 0) 894 return (fdopen(data, mode)); 895 (void) seteuid((uid_t)0); 896 s = socket(AF_INET, SOCK_STREAM, 0); 897 if (s < 0) 898 goto bad; 899 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 900 (char *) &on, sizeof(on)) < 0) 901 goto bad; 902 /* anchor socket to avoid multi-homing problems */ 903 data_source.sin_len = sizeof(struct sockaddr_in); 904 data_source.sin_family = AF_INET; 905 data_source.sin_addr = ctrl_addr.sin_addr; 906 for (tries = 1; ; tries++) { 907 if (bind(s, (struct sockaddr *)&data_source, 908 sizeof(data_source)) >= 0) 909 break; 910 if (errno != EADDRINUSE || tries > 10) 911 goto bad; 912 sleep(tries); 913 } 914 (void) seteuid((uid_t)pw->pw_uid); 915 #ifdef IP_TOS 916 on = IPTOS_THROUGHPUT; 917 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 918 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 919 #endif 920 return (fdopen(s, mode)); 921 bad: 922 /* Return the real value of errno (close may change it) */ 923 t = errno; 924 (void) seteuid((uid_t)pw->pw_uid); 925 (void) close(s); 926 errno = t; 927 return (NULL); 928 } 929 930 static FILE * 931 dataconn(name, size, mode) 932 char *name; 933 off_t size; 934 char *mode; 935 { 936 char sizebuf[32]; 937 FILE *file; 938 int retry = 0, tos; 939 940 file_size = size; 941 byte_count = 0; 942 if (size != (off_t) -1) 943 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", 944 (long long)size); 945 else 946 sizebuf[0] = '\0'; 947 if (pdata >= 0) { 948 struct sockaddr_in from; 949 int s, fromlen = sizeof(from); 950 951 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 952 if (s < 0) { 953 reply(425, "Can't open data connection."); 954 (void) close(pdata); 955 pdata = -1; 956 return (NULL); 957 } 958 (void) close(pdata); 959 pdata = s; 960 #ifdef IP_TOS 961 tos = IPTOS_THROUGHPUT; 962 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 963 sizeof(int)); 964 #endif 965 reply(150, "Opening %s mode data connection for '%s'%s.", 966 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 967 return (fdopen(pdata, mode)); 968 } 969 if (data >= 0) { 970 reply(125, "Using existing data connection for '%s'%s.", 971 name, sizebuf); 972 usedefault = 1; 973 return (fdopen(data, mode)); 974 } 975 if (usedefault) 976 data_dest = his_addr; 977 usedefault = 1; 978 file = getdatasock(mode); 979 if (file == NULL) { 980 reply(425, "Can't create data socket (%s,%d): %s.", 981 inet_ntoa(data_source.sin_addr), 982 ntohs(data_source.sin_port), strerror(errno)); 983 return (NULL); 984 } 985 data = fileno(file); 986 while (connect(data, (struct sockaddr *)&data_dest, 987 sizeof(data_dest)) < 0) { 988 if (errno == EADDRINUSE && retry < swaitmax) { 989 sleep((unsigned) swaitint); 990 retry += swaitint; 991 continue; 992 } 993 perror_reply(425, "Can't build data connection"); 994 (void) fclose(file); 995 data = -1; 996 return (NULL); 997 } 998 reply(150, "Opening %s mode data connection for '%s'%s.", 999 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1000 return (file); 1001 } 1002 1003 /* 1004 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1005 * encapsulation of the data subject * to Mode, Structure, and Type. 1006 * 1007 * NB: Form isn't handled. 1008 */ 1009 static void 1010 send_data(instr, outstr, blksize) 1011 FILE *instr, *outstr; 1012 off_t blksize; 1013 { 1014 int c, cnt, filefd, netfd; 1015 char *buf; 1016 1017 transflag++; 1018 if (setjmp(urgcatch)) { 1019 transflag = 0; 1020 return; 1021 } 1022 1023 switch (type) { 1024 1025 case TYPE_A: 1026 while ((c = getc(instr)) != EOF) { 1027 byte_count++; 1028 if (c == '\n') { 1029 if (ferror(outstr)) 1030 goto data_err; 1031 (void) putc('\r', outstr); 1032 } 1033 (void) putc(c, outstr); 1034 } 1035 fflush(outstr); 1036 transflag = 0; 1037 if (ferror(instr)) 1038 goto file_err; 1039 if (ferror(outstr)) 1040 goto data_err; 1041 reply(226, "Transfer complete."); 1042 return; 1043 1044 case TYPE_I: 1045 case TYPE_L: 1046 if ((buf = malloc((u_int)blksize)) == NULL) { 1047 transflag = 0; 1048 perror_reply(451, "Local resource failure: malloc"); 1049 return; 1050 } 1051 netfd = fileno(outstr); 1052 filefd = fileno(instr); 1053 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1054 write(netfd, buf, cnt) == cnt) 1055 byte_count += cnt; 1056 transflag = 0; 1057 (void)free(buf); 1058 if (cnt != 0) { 1059 if (cnt < 0) 1060 goto file_err; 1061 goto data_err; 1062 } 1063 reply(226, "Transfer complete."); 1064 return; 1065 default: 1066 transflag = 0; 1067 reply(550, "Unimplemented TYPE %d in send_data", type); 1068 return; 1069 } 1070 1071 data_err: 1072 transflag = 0; 1073 perror_reply(426, "Data connection"); 1074 return; 1075 1076 file_err: 1077 transflag = 0; 1078 perror_reply(551, "Error on input file"); 1079 } 1080 1081 /* 1082 * Transfer data from peer to "outstr" using the appropriate encapulation of 1083 * the data subject to Mode, Structure, and Type. 1084 * 1085 * N.B.: Form isn't handled. 1086 */ 1087 static int 1088 receive_data(instr, outstr) 1089 FILE *instr, *outstr; 1090 { 1091 int c, cnt, bare_lfs; 1092 char buf[BUFSIZ]; 1093 #ifdef __GNUC__ 1094 (void) &bare_lfs; 1095 #endif 1096 1097 bare_lfs = 0; 1098 transflag++; 1099 if (setjmp(urgcatch)) { 1100 transflag = 0; 1101 return (-1); 1102 } 1103 1104 switch (type) { 1105 1106 case TYPE_I: 1107 case TYPE_L: 1108 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1109 if (write(fileno(outstr), buf, cnt) != cnt) 1110 goto file_err; 1111 byte_count += cnt; 1112 } 1113 if (cnt < 0) 1114 goto data_err; 1115 transflag = 0; 1116 return (0); 1117 1118 case TYPE_E: 1119 reply(553, "TYPE E not implemented."); 1120 transflag = 0; 1121 return (-1); 1122 1123 case TYPE_A: 1124 while ((c = getc(instr)) != EOF) { 1125 byte_count++; 1126 if (c == '\n') 1127 bare_lfs++; 1128 while (c == '\r') { 1129 if (ferror(outstr)) 1130 goto data_err; 1131 if ((c = getc(instr)) != '\n') { 1132 (void) putc ('\r', outstr); 1133 if (c == '\0' || c == EOF) 1134 goto contin2; 1135 } 1136 } 1137 (void) putc(c, outstr); 1138 contin2: ; 1139 } 1140 fflush(outstr); 1141 if (ferror(instr)) 1142 goto data_err; 1143 if (ferror(outstr)) 1144 goto file_err; 1145 transflag = 0; 1146 if (bare_lfs) { 1147 lreply(226, 1148 "WARNING! %d bare linefeeds received in ASCII mode", 1149 bare_lfs); 1150 (void)printf(" File may not have transferred correctly.\r\n"); 1151 } 1152 return (0); 1153 default: 1154 reply(550, "Unimplemented TYPE %d in receive_data", type); 1155 transflag = 0; 1156 return (-1); 1157 } 1158 1159 data_err: 1160 transflag = 0; 1161 perror_reply(426, "Data Connection"); 1162 return (-1); 1163 1164 file_err: 1165 transflag = 0; 1166 perror_reply(452, "Error writing file"); 1167 return (-1); 1168 } 1169 1170 void 1171 statfilecmd(filename) 1172 char *filename; 1173 { 1174 FILE *fin; 1175 int c; 1176 char line[LINE_MAX]; 1177 1178 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1179 fin = ftpd_popen(line, "r", 0); 1180 lreply(211, "status of %s:", filename); 1181 while ((c = getc(fin)) != EOF) { 1182 if (c == '\n') { 1183 if (ferror(stdout)){ 1184 perror_reply(421, "control connection"); 1185 (void) ftpd_pclose(fin); 1186 dologout(1); 1187 /* NOTREACHED */ 1188 } 1189 if (ferror(fin)) { 1190 perror_reply(551, filename); 1191 (void) ftpd_pclose(fin); 1192 return; 1193 } 1194 (void) putc('\r', stdout); 1195 } 1196 (void) putc(c, stdout); 1197 } 1198 (void) ftpd_pclose(fin); 1199 reply(211, "End of Status"); 1200 } 1201 1202 void 1203 statcmd() 1204 { 1205 struct sockaddr_in *sin; 1206 u_char *a, *p; 1207 1208 lreply(211, "%s FTP server status:", hostname); 1209 lreply(211, "%s", version); 1210 if (isdigit(remotehost[0])) 1211 lreply(211, "Connected to %s", remotehost); 1212 else 1213 lreply(211, "Connected to %s (%s)", remotehost, 1214 inet_ntoa(his_addr.sin_addr)); 1215 if (logged_in) { 1216 if (guest) 1217 lreply(211, "Logged in anonymously"); 1218 else 1219 lreply(211, "Logged in as %s", pw->pw_name); 1220 } else if (askpasswd) 1221 lreply(211, "Waiting for password"); 1222 else 1223 lreply(211, "Waiting for user name"); 1224 printf("211- TYPE: %s", typenames[type]); 1225 if (type == TYPE_A || type == TYPE_E) 1226 printf(", FORM: %s", formnames[form]); 1227 if (type == TYPE_L) 1228 #if NBBY == 8 1229 printf(" %d", NBBY); 1230 #else 1231 printf(" %d", bytesize); /* need definition! */ 1232 #endif 1233 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1234 strunames[stru], modenames[mode]); 1235 if (data != -1) 1236 lreply(211, "Data connection open"); 1237 else if (pdata != -1) { 1238 printf("211- in Passive mode"); 1239 sin = &pasv_addr; 1240 goto printaddr; 1241 } else if (usedefault == 0) { 1242 printf("211- PORT"); 1243 sin = &data_dest; 1244 printaddr: 1245 a = (u_char *) &sin->sin_addr; 1246 p = (u_char *) &sin->sin_port; 1247 #define UC(b) (((int) b) & 0xff) 1248 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1249 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1250 #undef UC 1251 } else 1252 lreply(211, "No data connection"); 1253 1254 if (logged_in) { 1255 struct ftpconv *cp; 1256 1257 lreply(211, ""); 1258 lreply(211, "Class: %s", curclass.classname); 1259 if (curclass.display) 1260 lreply(211, "Display file: %s", curclass.display); 1261 if (curclass.notify) 1262 lreply(211, "Notify fileglob: %s", curclass.notify); 1263 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1264 curclass.timeout, curclass.maxtimeout); 1265 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1266 curclass.modify ? "en" : "dis"); 1267 lreply(211, "Umask: %.04o", curclass.umask); 1268 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1269 if (cp->suffix == NULL || cp->types == NULL || 1270 cp->command == NULL) 1271 continue; 1272 lreply(211, 1273 "Conversion: %s [%s] disable: %s, command: %s", 1274 cp->suffix, cp->types, cp->disable, cp->command); 1275 } 1276 } 1277 1278 reply(211, "End of status"); 1279 } 1280 1281 void 1282 fatal(s) 1283 char *s; 1284 { 1285 1286 reply(451, "Error in server: %s\n", s); 1287 reply(221, "Closing connection due to server error."); 1288 dologout(0); 1289 /* NOTREACHED */ 1290 } 1291 1292 void 1293 #if __STDC__ 1294 reply(int n, const char *fmt, ...) 1295 #else 1296 reply(n, fmt, va_alist) 1297 int n; 1298 char *fmt; 1299 va_dcl 1300 #endif 1301 { 1302 va_list ap; 1303 #if __STDC__ 1304 va_start(ap, fmt); 1305 #else 1306 va_start(ap); 1307 #endif 1308 (void)printf("%d ", n); 1309 (void)vprintf(fmt, ap); 1310 (void)printf("\r\n"); 1311 (void)fflush(stdout); 1312 if (debug) { 1313 syslog(LOG_DEBUG, "<--- %d ", n); 1314 vsyslog(LOG_DEBUG, fmt, ap); 1315 } 1316 } 1317 1318 void 1319 #if __STDC__ 1320 lreply(int n, const char *fmt, ...) 1321 #else 1322 lreply(n, fmt, va_alist) 1323 int n; 1324 char *fmt; 1325 va_dcl 1326 #endif 1327 { 1328 va_list ap; 1329 #if __STDC__ 1330 va_start(ap, fmt); 1331 #else 1332 va_start(ap); 1333 #endif 1334 (void)printf("%d- ", n); 1335 (void)vprintf(fmt, ap); 1336 (void)printf("\r\n"); 1337 (void)fflush(stdout); 1338 if (debug) { 1339 syslog(LOG_DEBUG, "<--- %d- ", n); 1340 vsyslog(LOG_DEBUG, fmt, ap); 1341 } 1342 } 1343 1344 static void 1345 ack(s) 1346 char *s; 1347 { 1348 1349 reply(250, "%s command successful.", s); 1350 } 1351 1352 void 1353 nack(s) 1354 char *s; 1355 { 1356 1357 reply(502, "%s command not implemented.", s); 1358 } 1359 1360 /* ARGSUSED */ 1361 void 1362 yyerror(s) 1363 char *s; 1364 { 1365 char *cp; 1366 1367 if ((cp = strchr(cbuf,'\n')) != NULL) 1368 *cp = '\0'; 1369 reply(500, "'%s': command not understood.", cbuf); 1370 } 1371 1372 void 1373 delete(name) 1374 char *name; 1375 { 1376 struct stat st; 1377 1378 LOGCMD("delete", name); 1379 if (stat(name, &st) < 0) { 1380 perror_reply(550, name); 1381 return; 1382 } 1383 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1384 if (rmdir(name) < 0) { 1385 perror_reply(550, name); 1386 return; 1387 } 1388 goto done; 1389 } 1390 if (unlink(name) < 0) { 1391 perror_reply(550, name); 1392 return; 1393 } 1394 done: 1395 ack("DELE"); 1396 } 1397 1398 void 1399 cwd(path) 1400 char *path; 1401 { 1402 1403 if (chdir(path) < 0) 1404 perror_reply(550, path); 1405 else { 1406 show_chdir_messages(250); 1407 ack("CWD"); 1408 } 1409 } 1410 1411 static void 1412 replydirname(name, message) 1413 const char *name, *message; 1414 { 1415 char npath[MAXPATHLEN + 1]; 1416 int i; 1417 1418 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 1419 npath[i] = *name; 1420 if (*name == '"') 1421 npath[++i] = '"'; 1422 } 1423 npath[i] = '\0'; 1424 reply(257, "\"%s\" %s", npath, message); 1425 } 1426 1427 void 1428 makedir(name) 1429 char *name; 1430 { 1431 1432 LOGCMD("mkdir", name); 1433 if (mkdir(name, 0777) < 0) 1434 perror_reply(550, name); 1435 else 1436 replydirname(name, "directory created."); 1437 } 1438 1439 void 1440 removedir(name) 1441 char *name; 1442 { 1443 1444 LOGCMD("rmdir", name); 1445 if (rmdir(name) < 0) 1446 perror_reply(550, name); 1447 else 1448 ack("RMD"); 1449 } 1450 1451 void 1452 pwd() 1453 { 1454 char path[MAXPATHLEN + 1]; 1455 1456 if (getcwd(path, sizeof(path) - 1) == NULL) 1457 reply(550, "%s.", path); 1458 else 1459 replydirname(path, "is the current directory."); 1460 } 1461 1462 char * 1463 renamefrom(name) 1464 char *name; 1465 { 1466 struct stat st; 1467 1468 if (stat(name, &st) < 0) { 1469 perror_reply(550, name); 1470 return ((char *)0); 1471 } 1472 reply(350, "File exists, ready for destination name"); 1473 return (name); 1474 } 1475 1476 void 1477 renamecmd(from, to) 1478 char *from, *to; 1479 { 1480 1481 LOGCMD2("rename", from, to); 1482 if (rename(from, to) < 0) 1483 perror_reply(550, "rename"); 1484 else 1485 ack("RNTO"); 1486 } 1487 1488 static void 1489 dolog(sin) 1490 struct sockaddr_in *sin; 1491 { 1492 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1493 sizeof(struct in_addr), AF_INET); 1494 1495 if (hp) 1496 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1497 else 1498 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1499 sizeof(remotehost)); 1500 #ifdef HASSETPROCTITLE 1501 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1502 setproctitle(proctitle); 1503 #endif /* HASSETPROCTITLE */ 1504 1505 if (logging) 1506 syslog(LOG_INFO, "connection from %s", remotehost); 1507 } 1508 1509 /* 1510 * Record logout in wtmp file 1511 * and exit with supplied status. 1512 */ 1513 void 1514 dologout(status) 1515 int status; 1516 { 1517 /* 1518 * Prevent reception of SIGURG from resulting in a resumption 1519 * back to the main program loop. 1520 */ 1521 transflag = 0; 1522 1523 if (logged_in) { 1524 (void) seteuid((uid_t)0); 1525 logwtmp(ttyline, "", ""); 1526 #if defined(KERBEROS) 1527 if (!notickets && krbtkfile_env) 1528 unlink(krbtkfile_env); 1529 #endif 1530 } 1531 /* beware of flushing buffers after a SIGPIPE */ 1532 _exit(status); 1533 } 1534 1535 static void 1536 myoob(signo) 1537 int signo; 1538 { 1539 char *cp; 1540 1541 /* only process if transfer occurring */ 1542 if (!transflag) 1543 return; 1544 cp = tmpline; 1545 if (getline(cp, 7, stdin) == NULL) { 1546 reply(221, "You could at least say goodbye."); 1547 dologout(0); 1548 } 1549 upper(cp); 1550 if (strcmp(cp, "ABOR\r\n") == 0) { 1551 tmpline[0] = '\0'; 1552 reply(426, "Transfer aborted. Data connection closed."); 1553 reply(226, "Abort successful"); 1554 longjmp(urgcatch, 1); 1555 } 1556 if (strcmp(cp, "STAT\r\n") == 0) { 1557 if (file_size != (off_t) -1) 1558 reply(213, "Status: %qd of %qd bytes transferred", 1559 byte_count, file_size); 1560 else 1561 reply(213, "Status: %qd bytes transferred", byte_count); 1562 } 1563 } 1564 1565 /* 1566 * Note: a response of 425 is not mentioned as a possible response to 1567 * the PASV command in RFC959. However, it has been blessed as 1568 * a legitimate response by Jon Postel in a telephone conversation 1569 * with Rick Adams on 25 Jan 89. 1570 */ 1571 void 1572 passive() 1573 { 1574 int len; 1575 char *p, *a; 1576 1577 pdata = socket(AF_INET, SOCK_STREAM, 0); 1578 if (pdata < 0 || !logged_in) { 1579 perror_reply(425, "Can't open passive connection"); 1580 return; 1581 } 1582 pasv_addr = ctrl_addr; 1583 pasv_addr.sin_port = 0; 1584 (void) seteuid((uid_t)0); 1585 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1586 (void) seteuid((uid_t)pw->pw_uid); 1587 goto pasv_error; 1588 } 1589 (void) seteuid((uid_t)pw->pw_uid); 1590 len = sizeof(pasv_addr); 1591 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1592 goto pasv_error; 1593 if (listen(pdata, 1) < 0) 1594 goto pasv_error; 1595 a = (char *) &pasv_addr.sin_addr; 1596 p = (char *) &pasv_addr.sin_port; 1597 1598 #define UC(b) (((int) b) & 0xff) 1599 1600 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1601 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1602 return; 1603 1604 pasv_error: 1605 (void) close(pdata); 1606 pdata = -1; 1607 perror_reply(425, "Can't open passive connection"); 1608 return; 1609 } 1610 1611 /* 1612 * Generate unique name for file with basename "local". 1613 * The file named "local" is already known to exist. 1614 * Generates failure reply on error. 1615 * 1616 * XXX this function should under go changes similar to 1617 * the mktemp(3)/mkstemp(3) changes. 1618 */ 1619 static char * 1620 gunique(local) 1621 char *local; 1622 { 1623 static char new[MAXPATHLEN]; 1624 struct stat st; 1625 int count, len; 1626 char *cp; 1627 1628 cp = strrchr(local, '/'); 1629 if (cp) 1630 *cp = '\0'; 1631 if (stat(cp ? local : ".", &st) < 0) { 1632 perror_reply(553, cp ? local : "."); 1633 return ((char *) 0); 1634 } 1635 if (cp) 1636 *cp = '/'; 1637 (void) strcpy(new, local); 1638 len = strlen(new); 1639 cp = new + len; 1640 *cp++ = '.'; 1641 for (count = 1; count < 100; count++) { 1642 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1643 if (stat(new, &st) < 0) 1644 return (new); 1645 } 1646 reply(452, "Unique file name cannot be created."); 1647 return (NULL); 1648 } 1649 1650 /* 1651 * Format and send reply containing system error number. 1652 */ 1653 void 1654 perror_reply(code, string) 1655 int code; 1656 char *string; 1657 { 1658 1659 reply(code, "%s: %s.", string, strerror(errno)); 1660 } 1661 1662 static char *onefile[] = { 1663 "", 1664 0 1665 }; 1666 1667 void 1668 send_file_list(whichf) 1669 char *whichf; 1670 { 1671 struct stat st; 1672 DIR *dirp = NULL; 1673 struct dirent *dir; 1674 FILE *dout = NULL; 1675 char **dirlist, *dirname; 1676 int simple = 0; 1677 int freeglob = 0; 1678 glob_t gl; 1679 #ifdef __GNUC__ 1680 (void) &dout; 1681 (void) &dirlist; 1682 (void) &simple; 1683 (void) &freeglob; 1684 #endif 1685 1686 if (strpbrk(whichf, "~{[*?") != NULL) { 1687 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1688 1689 memset(&gl, 0, sizeof(gl)); 1690 freeglob = 1; 1691 if (glob(whichf, flags, 0, &gl)) { 1692 reply(550, "not found"); 1693 goto out; 1694 } else if (gl.gl_pathc == 0) { 1695 errno = ENOENT; 1696 perror_reply(550, whichf); 1697 goto out; 1698 } 1699 dirlist = gl.gl_pathv; 1700 } else { 1701 onefile[0] = whichf; 1702 dirlist = onefile; 1703 simple = 1; 1704 } 1705 1706 if (setjmp(urgcatch)) { 1707 transflag = 0; 1708 goto out; 1709 } 1710 while ((dirname = *dirlist++) != NULL) { 1711 int trailingslash = 0; 1712 1713 if (stat(dirname, &st) < 0) { 1714 /* 1715 * If user typed "ls -l", etc, and the client 1716 * used NLST, do what the user meant. 1717 */ 1718 if (dirname[0] == '-' && *dirlist == NULL && 1719 transflag == 0) { 1720 retrieve("/bin/ls %s", dirname); 1721 goto out; 1722 } 1723 perror_reply(550, whichf); 1724 if (dout != NULL) { 1725 (void) fclose(dout); 1726 transflag = 0; 1727 data = -1; 1728 pdata = -1; 1729 } 1730 goto out; 1731 } 1732 1733 if (S_ISREG(st.st_mode)) { 1734 if (dout == NULL) { 1735 dout = dataconn("file list", (off_t)-1, "w"); 1736 if (dout == NULL) 1737 goto out; 1738 transflag++; 1739 } 1740 fprintf(dout, "%s%s\n", dirname, 1741 type == TYPE_A ? "\r" : ""); 1742 byte_count += strlen(dirname) + 1; 1743 continue; 1744 } else if (!S_ISDIR(st.st_mode)) 1745 continue; 1746 1747 if (dirname[strlen(dirname) - 1] == '/') 1748 trailingslash++; 1749 1750 if ((dirp = opendir(dirname)) == NULL) 1751 continue; 1752 1753 while ((dir = readdir(dirp)) != NULL) { 1754 char nbuf[MAXPATHLEN]; 1755 1756 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1757 continue; 1758 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1759 dir->d_namlen == 2) 1760 continue; 1761 1762 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 1763 trailingslash ? "" : "/", dir->d_name); 1764 1765 /* 1766 * We have to do a stat to ensure it's 1767 * not a directory or special file. 1768 */ 1769 if (simple || (stat(nbuf, &st) == 0 && 1770 S_ISREG(st.st_mode))) { 1771 if (dout == NULL) { 1772 dout = dataconn("file list", (off_t)-1, 1773 "w"); 1774 if (dout == NULL) 1775 goto out; 1776 transflag++; 1777 } 1778 if (nbuf[0] == '.' && nbuf[1] == '/') 1779 fprintf(dout, "%s%s\n", &nbuf[2], 1780 type == TYPE_A ? "\r" : ""); 1781 else 1782 fprintf(dout, "%s%s\n", nbuf, 1783 type == TYPE_A ? "\r" : ""); 1784 byte_count += strlen(nbuf) + 1; 1785 } 1786 } 1787 (void) closedir(dirp); 1788 } 1789 1790 if (dout == NULL) 1791 reply(550, "No files found."); 1792 else if (ferror(dout) != 0) 1793 perror_reply(550, "Data connection"); 1794 else 1795 reply(226, "Transfer complete."); 1796 1797 transflag = 0; 1798 if (dout != NULL) 1799 (void) fclose(dout); 1800 data = -1; 1801 pdata = -1; 1802 out: 1803 if (freeglob) { 1804 freeglob = 0; 1805 globfree(&gl); 1806 } 1807 } 1808
Indexes created Wed Sep 24 22:09:59 GMT 2025