ftpd.c revision 1.26
1 /* $NetBSD: ftpd.c,v 1.26 1997/06/21 04:38:54 mellon 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 1.26 1997/06/21 04:38:54 mellon 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 7.00"; 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, cnt); \ 175 } 176 177 static void ack __P((char *)); 178 static void myoob __P((int)); 179 static int checkuser __P((char *, char *)); 180 static int checkaccess __P((char *)); 181 static FILE *dataconn __P((char *, off_t, char *)); 182 static void dolog __P((struct sockaddr_in *)); 183 static char *curdir __P((void)); 184 static void end_login __P((void)); 185 static FILE *getdatasock __P((char *)); 186 static char *gunique __P((char *)); 187 static void lostconn __P((int)); 188 static int receive_data __P((FILE *, FILE *)); 189 static void send_data __P((FILE *, FILE *, off_t)); 190 static struct passwd * 191 sgetpwnam __P((char *)); 192 static char *sgetsave __P((char *)); 193 194 int main __P((int, char *[], char **)); 195 196 #if defined (KERBEROS) 197 int klogin __P((struct passwd *, char *, char *, char *)); 198 #endif 199 200 static char * 201 curdir() 202 { 203 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 204 205 if (getcwd(path, sizeof(path)-2) == NULL) 206 return (""); 207 if (path[1] != '\0') /* special case for root dir. */ 208 strcat(path, "/"); 209 /* For guest account, skip / since it's chrooted */ 210 return (guest ? path+1 : path); 211 } 212 213 int 214 main(argc, argv, envp) 215 int argc; 216 char *argv[]; 217 char **envp; 218 { 219 int addrlen, ch, on = 1, tos; 220 char *cp, line[LINE_MAX]; 221 FILE *fd; 222 223 /* 224 * LOG_NDELAY sets up the logging connection immediately, 225 * necessary for anonymous ftp's that chroot and can't do it later. 226 */ 227 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 228 addrlen = sizeof(his_addr); 229 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 230 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 231 exit(1); 232 } 233 addrlen = sizeof(ctrl_addr); 234 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 235 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 236 exit(1); 237 } 238 #ifdef IP_TOS 239 tos = IPTOS_LOWDELAY; 240 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 241 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 242 #endif 243 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 244 debug = 0; 245 246 /* set this here so klogin can use it... */ 247 (void)sprintf(ttyline, "ftp%d", getpid()); 248 249 while ((ch = getopt(argc, argv, "a:dlt:T:u:v")) != EOF) { 250 switch (ch) { 251 case 'a': 252 anondir = optarg; 253 break; 254 255 case 'd': 256 case 'v': /* deprecated */ 257 debug = 1; 258 break; 259 260 case 'l': 261 logging++; /* > 1 == extra logging */ 262 break; 263 264 case 't': 265 case 'T': 266 case 'u': 267 warnx("-%c has be deprecated in favour of ftpd.conf", 268 ch); 269 break; 270 271 default: 272 warnx("unknown flag -%c ignored", optopt); 273 break; 274 } 275 } 276 (void) freopen(_PATH_DEVNULL, "w", stderr); 277 (void) signal(SIGPIPE, lostconn); 278 (void) signal(SIGCHLD, SIG_IGN); 279 if ((long)signal(SIGURG, myoob) < 0) 280 syslog(LOG_ERR, "signal: %m"); 281 282 /* Try to handle urgent data inline */ 283 #ifdef SO_OOBINLINE 284 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 285 syslog(LOG_ERR, "setsockopt: %m"); 286 #endif 287 288 #ifdef F_SETOWN 289 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 290 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 291 #endif 292 dolog(&his_addr); 293 /* 294 * Set up default state 295 */ 296 data = -1; 297 type = TYPE_A; 298 form = FORM_N; 299 stru = STRU_F; 300 mode = MODE_S; 301 tmpline[0] = '\0'; 302 303 /* If logins are disabled, print out the message. */ 304 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 305 while (fgets(line, sizeof(line), fd) != NULL) { 306 if ((cp = strchr(line, '\n')) != NULL) 307 *cp = '\0'; 308 lreply(530, "%s", line); 309 } 310 (void) fflush(stdout); 311 (void) fclose(fd); 312 reply(530, "System not available."); 313 exit(0); 314 } 315 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 316 while (fgets(line, sizeof(line), fd) != NULL) { 317 if ((cp = strchr(line, '\n')) != NULL) 318 *cp = '\0'; 319 lreply(220, "%s", line); 320 } 321 (void) fflush(stdout); 322 (void) fclose(fd); 323 /* reply(220,) must follow */ 324 } 325 (void) gethostname(hostname, sizeof(hostname)); 326 reply(220, "%s FTP server (%s) ready.", hostname, version); 327 (void) setjmp(errcatch); 328 for (;;) 329 (void) yyparse(); 330 /* NOTREACHED */ 331 } 332 333 static void 334 lostconn(signo) 335 int signo; 336 { 337 338 if (debug) 339 syslog(LOG_DEBUG, "lost connection"); 340 dologout(-1); 341 } 342 343 /* 344 * Helper function for sgetpwnam(). 345 */ 346 static char * 347 sgetsave(s) 348 char *s; 349 { 350 char *new = malloc((unsigned) strlen(s) + 1); 351 352 if (new == NULL) { 353 perror_reply(421, "Local resource failure: malloc"); 354 dologout(1); 355 /* NOTREACHED */ 356 } 357 (void) strcpy(new, s); 358 return (new); 359 } 360 361 /* 362 * Save the result of a getpwnam. Used for USER command, since 363 * the data returned must not be clobbered by any other command 364 * (e.g., globbing). 365 */ 366 static struct passwd * 367 sgetpwnam(name) 368 char *name; 369 { 370 static struct passwd save; 371 struct passwd *p; 372 373 if ((p = getpwnam(name)) == NULL) 374 return (p); 375 if (save.pw_name) { 376 free(save.pw_name); 377 free(save.pw_passwd); 378 free(save.pw_gecos); 379 free(save.pw_dir); 380 free(save.pw_shell); 381 } 382 save = *p; 383 save.pw_name = sgetsave(p->pw_name); 384 save.pw_passwd = sgetsave(p->pw_passwd); 385 save.pw_gecos = sgetsave(p->pw_gecos); 386 save.pw_dir = sgetsave(p->pw_dir); 387 save.pw_shell = sgetsave(p->pw_shell); 388 return (&save); 389 } 390 391 static int login_attempts; /* number of failed login attempts */ 392 static int askpasswd; /* had user command, ask for passwd */ 393 static char curname[10]; /* current USER name */ 394 395 /* 396 * USER command. 397 * Sets global passwd pointer pw if named account exists and is acceptable; 398 * sets askpasswd if a PASS command is expected. If logged in previously, 399 * need to reset state. If name is "ftp" or "anonymous", the name is not in 400 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 401 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 402 * requesting login privileges. Disallow anyone who does not have a standard 403 * shell as returned by getusershell(). Disallow anyone mentioned in the file 404 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 405 */ 406 void 407 user(name) 408 char *name; 409 { 410 if (logged_in) { 411 if (guest) { 412 reply(530, "Can't change user from guest login."); 413 return; 414 } else if (dochroot) { 415 reply(530, "Can't change user from chroot user."); 416 return; 417 } 418 end_login(); 419 } 420 421 guest = 0; 422 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 423 if (checkaccess("ftp") || checkaccess("anonymous")) 424 reply(530, "User %s access denied.", name); 425 else if ((pw = sgetpwnam("ftp")) != NULL) { 426 guest = 1; 427 askpasswd = 1; 428 reply(331, 429 "Guest login ok, type your name as password."); 430 } else 431 reply(530, "User %s unknown.", name); 432 if (!askpasswd && logging) 433 syslog(LOG_NOTICE, 434 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 435 return; 436 } 437 pw = sgetpwnam(name); 438 if (logging) 439 strncpy(curname, name, sizeof(curname)-1); 440 #ifdef SKEY 441 if (!skey_haskey(name)) { 442 char *myskey, *skey_keyinfo __P((char *name)); 443 444 myskey = skey_keyinfo(name); 445 reply(331, "Password [%s] for %s required.", 446 myskey ? myskey : "error getting challenge", name); 447 } else 448 #endif 449 reply(331, "Password required for %s.", name); 450 451 askpasswd = 1; 452 /* 453 * Delay before reading passwd after first failed 454 * attempt to slow down passwd-guessing programs. 455 */ 456 if (login_attempts) 457 sleep((unsigned) login_attempts); 458 } 459 460 /* 461 * Check if a user is in the file "fname" 462 */ 463 static int 464 checkuser(fname, name) 465 char *fname; 466 char *name; 467 { 468 FILE *fd; 469 int found = 0; 470 char *p, line[BUFSIZ]; 471 472 if ((fd = fopen(fname, "r")) != NULL) { 473 while (fgets(line, sizeof(line), fd) != NULL) 474 if ((p = strchr(line, '\n')) != NULL) { 475 *p = '\0'; 476 if (line[0] == '#') 477 continue; 478 if (strcmp(line, name) == 0) { 479 found = 1; 480 break; 481 } 482 } 483 (void) fclose(fd); 484 } 485 return (found); 486 } 487 488 /* 489 * Determine whether a user has access, based on information in 490 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 491 * `allow' or `deny' (with deny being the default if anything but 492 * `allow', or nothing at all, is specified). 493 * 494 * Each glob is matched against the username in turn, and the first 495 * match found is used. If no match is found, access is allowed. 496 * 497 * Any line starting with `#' is considered a comment and ignored. 498 * 499 * This is probably not the best way to do this, but it preserves 500 * the old semantics where if a user was listed in the file he was 501 * denied, otherwise he was allowed. 502 * 503 * There is one change in the semantics, however; ftpd will now `fail 504 * safe' and deny all access if there's no /etc/ftpusers file. 505 * 506 * Return 1 if the user is denied, or 0 if he is allowed. 507 */ 508 static int 509 checkaccess(name) 510 char *name; 511 { 512 #define ALLOWED 0 513 #define NOT_ALLOWED 1 514 FILE *fd; 515 int retval = ALLOWED; 516 char *glob, *perm, line[BUFSIZ]; 517 518 if ((fd = fopen(_PATH_FTPUSERS, "r")) == NULL) 519 return NOT_ALLOWED; 520 521 while (fgets(line, sizeof(line), fd) != NULL) { 522 glob = strtok(line, " \t\n"); 523 if (glob[0] == '#') 524 continue; 525 perm = strtok(NULL, " \t\n"); 526 if (fnmatch(glob, name, 0) == 0) { 527 if (perm != NULL && strcmp(perm, "allow") == 0) 528 retval = ALLOWED; 529 else 530 retval = NOT_ALLOWED; 531 break; 532 } 533 } 534 (void) fclose(fd); 535 return (retval); 536 537 } 538 #undef ALLOWED 539 #undef NOT_ALLOWED 540 541 /* 542 * Terminate login as previous user, if any, resetting state; 543 * used when USER command is given or login fails. 544 */ 545 static void 546 end_login() 547 { 548 549 (void) seteuid((uid_t)0); 550 if (logged_in) 551 logwtmp(ttyline, "", ""); 552 pw = NULL; 553 logged_in = 0; 554 guest = 0; 555 dochroot = 0; 556 } 557 558 void 559 pass(passwd) 560 char *passwd; 561 { 562 int rval; 563 FILE *fd; 564 char *cp, *shell; 565 566 if (logged_in || askpasswd == 0) { 567 reply(503, "Login with USER first."); 568 return; 569 } 570 askpasswd = 0; 571 if (!guest) { /* "ftp" is only account allowed no password */ 572 if (pw == NULL) { 573 rval = 1; /* failure below */ 574 goto skip; 575 } 576 #if defined(KERBEROS) 577 rval = klogin(pw, "", hostname, passwd); 578 if (rval == 0) 579 goto skip; 580 #endif 581 #ifdef SKEY 582 if (skey_haskey(pw->pw_name) == 0 && 583 (skey_passcheck(pw->pw_name, passwd) != -1)) { 584 rval = 0; 585 goto skip; 586 } 587 #endif 588 /* the strcmp does not catch null passwords! */ 589 if (pw == NULL || *pw->pw_passwd == '\0' || 590 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 591 rval = 1; /* failure */ 592 goto skip; 593 } 594 rval = 0; 595 596 skip: 597 /* 598 * If rval == 1, the user failed the authentication check 599 * above. If rval == 0, either Kerberos or local authentication 600 * succeeded. 601 */ 602 if (rval) { 603 reply(530, "Login incorrect."); 604 if (logging) { 605 syslog(LOG_NOTICE, 606 "FTP LOGIN FAILED FROM %s", remotehost); 607 syslog(LOG_AUTHPRIV | LOG_NOTICE, 608 "FTP LOGIN FAILED FROM %s, %s", 609 remotehost, curname); 610 } 611 pw = NULL; 612 if (login_attempts++ >= 5) { 613 syslog(LOG_NOTICE, 614 "repeated login failures from %s", 615 remotehost); 616 exit(0); 617 } 618 return; 619 } 620 } 621 622 /* password was ok; see if anything else prevents login */ 623 if (checkaccess(pw->pw_name)) { 624 reply(530, "User %s may not use FTP.", pw->pw_name); 625 if (logging) 626 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 627 remotehost, pw->pw_name); 628 pw = (struct passwd *) NULL; 629 return; 630 } 631 /* check for valid shell, if not guest user */ 632 if ((shell = pw->pw_shell) == NULL || *shell == 0) 633 shell = _PATH_BSHELL; 634 while ((cp = getusershell()) != NULL) 635 if (strcmp(cp, shell) == 0) 636 break; 637 endusershell(); 638 if (cp == NULL && guest == 0) { 639 reply(530, "User %s may not use FTP.", pw->pw_name); 640 if (logging) 641 syslog(LOG_NOTICE, 642 "FTP LOGIN REFUSED FROM %s, %s", 643 remotehost, pw->pw_name); 644 pw = (struct passwd *) NULL; 645 return; 646 } 647 648 login_attempts = 0; /* this time successful */ 649 if (setegid((gid_t)pw->pw_gid) < 0) { 650 reply(550, "Can't set gid."); 651 return; 652 } 653 (void) initgroups(pw->pw_name, pw->pw_gid); 654 655 /* open wtmp before chroot */ 656 logwtmp(ttyline, pw->pw_name, remotehost); 657 logged_in = 1; 658 659 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 660 661 /* parse ftpd.conf, setting up various parameters */ 662 if (guest) 663 parse_conf(CLASS_GUEST); 664 else if (dochroot) 665 parse_conf(CLASS_CHROOT); 666 else 667 parse_conf(CLASS_REAL); 668 669 if (guest) { 670 /* 671 * We MUST do a chdir() after the chroot. Otherwise 672 * the old current directory will be accessible as "." 673 * outside the new root! 674 */ 675 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 676 chdir("/") < 0) { 677 reply(550, "Can't set guest privileges."); 678 goto bad; 679 } 680 } else if (dochroot) { 681 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 682 reply(550, "Can't change root."); 683 goto bad; 684 } 685 } else if (chdir(pw->pw_dir) < 0) { 686 if (chdir("/") < 0) { 687 reply(530, "User %s: can't change directory to %s.", 688 pw->pw_name, pw->pw_dir); 689 goto bad; 690 } else 691 lreply(230, "No directory! Logging in with home=/"); 692 } 693 if (seteuid((uid_t)pw->pw_uid) < 0) { 694 reply(550, "Can't set uid."); 695 goto bad; 696 } 697 /* 698 * Display a login message, if it exists. 699 * N.B. reply(230,) must follow the message. 700 */ 701 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 702 char *cp, line[LINE_MAX]; 703 704 while (fgets(line, sizeof(line), fd) != NULL) { 705 if ((cp = strchr(line, '\n')) != NULL) 706 *cp = '\0'; 707 lreply(230, "%s", line); 708 } 709 (void) fflush(stdout); 710 (void) fclose(fd); 711 } 712 show_chdir_messages(230); 713 if (guest) { 714 reply(230, "Guest login ok, access restrictions apply."); 715 #ifdef HASSETPROCTITLE 716 snprintf(proctitle, sizeof(proctitle), 717 "%s: anonymous/%.*s", remotehost, 718 (int) (sizeof(proctitle) - sizeof(remotehost) - 719 sizeof(": anonymous/")), passwd); 720 setproctitle(proctitle); 721 #endif /* HASSETPROCTITLE */ 722 if (logging) 723 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 724 remotehost, passwd); 725 } else { 726 reply(230, "User %s logged in.", pw->pw_name); 727 #ifdef HASSETPROCTITLE 728 snprintf(proctitle, sizeof(proctitle), 729 "%s: %s", remotehost, pw->pw_name); 730 setproctitle(proctitle); 731 #endif /* HASSETPROCTITLE */ 732 if (logging) 733 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 734 remotehost, pw->pw_name); 735 } 736 (void) umask(curclass.umask); 737 return; 738 bad: 739 /* Forget all about it... */ 740 end_login(); 741 } 742 743 void 744 retrieve(cmd, name) 745 char *cmd, *name; 746 { 747 FILE *fin, *dout; 748 struct stat st; 749 int (*closefunc) __P((FILE *)); 750 int log; 751 752 log = (cmd == 0); 753 if (cmd == 0) { 754 fin = fopen(name, "r"), closefunc = fclose; 755 if (fin == NULL) 756 cmd = do_conversion(name); 757 } 758 if (cmd) { 759 char line[BUFSIZ]; 760 761 (void) sprintf(line, cmd, name), name = line; 762 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 763 st.st_size = -1; 764 st.st_blksize = BUFSIZ; 765 } 766 if (fin == NULL) { 767 if (errno != 0) { 768 perror_reply(550, name); 769 if (log) { 770 LOGCMD("get", name); 771 } 772 } 773 return; 774 } 775 byte_count = -1; 776 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 777 reply(550, "%s: not a plain file.", name); 778 goto done; 779 } 780 if (restart_point) { 781 if (type == TYPE_A) { 782 off_t i, n; 783 int c; 784 785 n = restart_point; 786 i = 0; 787 while (i++ < n) { 788 if ((c=getc(fin)) == EOF) { 789 perror_reply(550, name); 790 goto done; 791 } 792 if (c == '\n') 793 i++; 794 } 795 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 796 perror_reply(550, name); 797 goto done; 798 } 799 } 800 dout = dataconn(name, st.st_size, "w"); 801 if (dout == NULL) 802 goto done; 803 send_data(fin, dout, st.st_blksize); 804 (void) fclose(dout); 805 data = -1; 806 pdata = -1; 807 done: 808 if (log) 809 LOGBYTES("get", name, byte_count); 810 (*closefunc)(fin); 811 } 812 813 void 814 store(name, mode, unique) 815 char *name, *mode; 816 int unique; 817 { 818 FILE *fout, *din; 819 struct stat st; 820 int (*closefunc) __P((FILE *)); 821 822 if (unique && stat(name, &st) == 0 && 823 (name = gunique(name)) == NULL) { 824 LOGCMD(*mode == 'w' ? "put" : "append", name); 825 return; 826 } 827 828 if (restart_point) 829 mode = "r+"; 830 fout = fopen(name, mode); 831 closefunc = fclose; 832 if (fout == NULL) { 833 perror_reply(553, name); 834 LOGCMD(*mode == 'w' ? "put" : "append", name); 835 return; 836 } 837 byte_count = -1; 838 if (restart_point) { 839 if (type == TYPE_A) { 840 off_t i, n; 841 int c; 842 843 n = restart_point; 844 i = 0; 845 while (i++ < n) { 846 if ((c=getc(fout)) == EOF) { 847 perror_reply(550, name); 848 goto done; 849 } 850 if (c == '\n') 851 i++; 852 } 853 /* 854 * We must do this seek to "current" position 855 * because we are changing from reading to 856 * writing. 857 */ 858 if (fseek(fout, 0L, SEEK_CUR) < 0) { 859 perror_reply(550, name); 860 goto done; 861 } 862 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 863 perror_reply(550, name); 864 goto done; 865 } 866 } 867 din = dataconn(name, (off_t)-1, "r"); 868 if (din == NULL) 869 goto done; 870 if (receive_data(din, fout) == 0) { 871 if (unique) 872 reply(226, "Transfer complete (unique file name:%s).", 873 name); 874 else 875 reply(226, "Transfer complete."); 876 } 877 (void) fclose(din); 878 data = -1; 879 pdata = -1; 880 done: 881 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 882 (*closefunc)(fout); 883 } 884 885 static FILE * 886 getdatasock(mode) 887 char *mode; 888 { 889 int on = 1, s, t, tries; 890 891 if (data >= 0) 892 return (fdopen(data, mode)); 893 (void) seteuid((uid_t)0); 894 s = socket(AF_INET, SOCK_STREAM, 0); 895 if (s < 0) 896 goto bad; 897 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 898 (char *) &on, sizeof(on)) < 0) 899 goto bad; 900 /* anchor socket to avoid multi-homing problems */ 901 data_source.sin_len = sizeof(struct sockaddr_in); 902 data_source.sin_family = AF_INET; 903 data_source.sin_addr = ctrl_addr.sin_addr; 904 for (tries = 1; ; tries++) { 905 if (bind(s, (struct sockaddr *)&data_source, 906 sizeof(data_source)) >= 0) 907 break; 908 if (errno != EADDRINUSE || tries > 10) 909 goto bad; 910 sleep(tries); 911 } 912 (void) seteuid((uid_t)pw->pw_uid); 913 #ifdef IP_TOS 914 on = IPTOS_THROUGHPUT; 915 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 916 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 917 #endif 918 return (fdopen(s, mode)); 919 bad: 920 /* Return the real value of errno (close may change it) */ 921 t = errno; 922 (void) seteuid((uid_t)pw->pw_uid); 923 (void) close(s); 924 errno = t; 925 return (NULL); 926 } 927 928 static FILE * 929 dataconn(name, size, mode) 930 char *name; 931 off_t size; 932 char *mode; 933 { 934 char sizebuf[32]; 935 FILE *file; 936 int retry = 0, tos; 937 938 file_size = size; 939 byte_count = 0; 940 if (size != (off_t) -1) 941 (void) sprintf(sizebuf, " (%qd bytes)", size); 942 else 943 (void) strcpy(sizebuf, ""); 944 if (pdata >= 0) { 945 struct sockaddr_in from; 946 int s, fromlen = sizeof(from); 947 948 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 949 if (s < 0) { 950 reply(425, "Can't open data connection."); 951 (void) close(pdata); 952 pdata = -1; 953 return (NULL); 954 } 955 (void) close(pdata); 956 pdata = s; 957 #ifdef IP_TOS 958 tos = IPTOS_THROUGHPUT; 959 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 960 sizeof(int)); 961 #endif 962 reply(150, "Opening %s mode data connection for '%s'%s.", 963 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 964 return (fdopen(pdata, mode)); 965 } 966 if (data >= 0) { 967 reply(125, "Using existing data connection for '%s'%s.", 968 name, sizebuf); 969 usedefault = 1; 970 return (fdopen(data, mode)); 971 } 972 if (usedefault) 973 data_dest = his_addr; 974 usedefault = 1; 975 file = getdatasock(mode); 976 if (file == NULL) { 977 reply(425, "Can't create data socket (%s,%d): %s.", 978 inet_ntoa(data_source.sin_addr), 979 ntohs(data_source.sin_port), strerror(errno)); 980 return (NULL); 981 } 982 data = fileno(file); 983 while (connect(data, (struct sockaddr *)&data_dest, 984 sizeof(data_dest)) < 0) { 985 if (errno == EADDRINUSE && retry < swaitmax) { 986 sleep((unsigned) swaitint); 987 retry += swaitint; 988 continue; 989 } 990 perror_reply(425, "Can't build data connection"); 991 (void) fclose(file); 992 data = -1; 993 return (NULL); 994 } 995 reply(150, "Opening %s mode data connection for '%s'%s.", 996 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 997 return (file); 998 } 999 1000 /* 1001 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1002 * encapsulation of the data subject * to Mode, Structure, and Type. 1003 * 1004 * NB: Form isn't handled. 1005 */ 1006 static void 1007 send_data(instr, outstr, blksize) 1008 FILE *instr, *outstr; 1009 off_t blksize; 1010 { 1011 int c, cnt, filefd, netfd; 1012 char *buf; 1013 1014 transflag++; 1015 if (setjmp(urgcatch)) { 1016 transflag = 0; 1017 return; 1018 } 1019 1020 switch (type) { 1021 1022 case TYPE_A: 1023 while ((c = getc(instr)) != EOF) { 1024 byte_count++; 1025 if (c == '\n') { 1026 if (ferror(outstr)) 1027 goto data_err; 1028 (void) putc('\r', outstr); 1029 } 1030 (void) putc(c, outstr); 1031 } 1032 fflush(outstr); 1033 transflag = 0; 1034 if (ferror(instr)) 1035 goto file_err; 1036 if (ferror(outstr)) 1037 goto data_err; 1038 reply(226, "Transfer complete."); 1039 return; 1040 1041 case TYPE_I: 1042 case TYPE_L: 1043 if ((buf = malloc((u_int)blksize)) == NULL) { 1044 transflag = 0; 1045 perror_reply(451, "Local resource failure: malloc"); 1046 return; 1047 } 1048 netfd = fileno(outstr); 1049 filefd = fileno(instr); 1050 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1051 write(netfd, buf, cnt) == cnt) 1052 byte_count += cnt; 1053 transflag = 0; 1054 (void)free(buf); 1055 if (cnt != 0) { 1056 if (cnt < 0) 1057 goto file_err; 1058 goto data_err; 1059 } 1060 reply(226, "Transfer complete."); 1061 return; 1062 default: 1063 transflag = 0; 1064 reply(550, "Unimplemented TYPE %d in send_data", type); 1065 return; 1066 } 1067 1068 data_err: 1069 transflag = 0; 1070 perror_reply(426, "Data connection"); 1071 return; 1072 1073 file_err: 1074 transflag = 0; 1075 perror_reply(551, "Error on input file"); 1076 } 1077 1078 /* 1079 * Transfer data from peer to "outstr" using the appropriate encapulation of 1080 * the data subject to Mode, Structure, and Type. 1081 * 1082 * N.B.: Form isn't handled. 1083 */ 1084 static int 1085 receive_data(instr, outstr) 1086 FILE *instr, *outstr; 1087 { 1088 int c, cnt, bare_lfs; 1089 char buf[BUFSIZ]; 1090 #ifdef __GNUC__ 1091 (void) &bare_lfs; 1092 #endif 1093 1094 bare_lfs = 0; 1095 transflag++; 1096 if (setjmp(urgcatch)) { 1097 transflag = 0; 1098 return (-1); 1099 } 1100 1101 switch (type) { 1102 1103 case TYPE_I: 1104 case TYPE_L: 1105 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1106 if (write(fileno(outstr), buf, cnt) != cnt) 1107 goto file_err; 1108 byte_count += cnt; 1109 } 1110 if (cnt < 0) 1111 goto data_err; 1112 transflag = 0; 1113 return (0); 1114 1115 case TYPE_E: 1116 reply(553, "TYPE E not implemented."); 1117 transflag = 0; 1118 return (-1); 1119 1120 case TYPE_A: 1121 while ((c = getc(instr)) != EOF) { 1122 byte_count++; 1123 if (c == '\n') 1124 bare_lfs++; 1125 while (c == '\r') { 1126 if (ferror(outstr)) 1127 goto data_err; 1128 if ((c = getc(instr)) != '\n') { 1129 (void) putc ('\r', outstr); 1130 if (c == '\0' || c == EOF) 1131 goto contin2; 1132 } 1133 } 1134 (void) putc(c, outstr); 1135 contin2: ; 1136 } 1137 fflush(outstr); 1138 if (ferror(instr)) 1139 goto data_err; 1140 if (ferror(outstr)) 1141 goto file_err; 1142 transflag = 0; 1143 if (bare_lfs) { 1144 lreply(226, 1145 "WARNING! %d bare linefeeds received in ASCII mode", 1146 bare_lfs); 1147 (void)printf(" File may not have transferred correctly.\r\n"); 1148 } 1149 return (0); 1150 default: 1151 reply(550, "Unimplemented TYPE %d in receive_data", type); 1152 transflag = 0; 1153 return (-1); 1154 } 1155 1156 data_err: 1157 transflag = 0; 1158 perror_reply(426, "Data Connection"); 1159 return (-1); 1160 1161 file_err: 1162 transflag = 0; 1163 perror_reply(452, "Error writing file"); 1164 return (-1); 1165 } 1166 1167 void 1168 statfilecmd(filename) 1169 char *filename; 1170 { 1171 FILE *fin; 1172 int c; 1173 char line[LINE_MAX]; 1174 1175 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1176 fin = ftpd_popen(line, "r", 0); 1177 lreply(211, "status of %s:", filename); 1178 while ((c = getc(fin)) != EOF) { 1179 if (c == '\n') { 1180 if (ferror(stdout)){ 1181 perror_reply(421, "control connection"); 1182 (void) ftpd_pclose(fin); 1183 dologout(1); 1184 /* NOTREACHED */ 1185 } 1186 if (ferror(fin)) { 1187 perror_reply(551, filename); 1188 (void) ftpd_pclose(fin); 1189 return; 1190 } 1191 (void) putc('\r', stdout); 1192 } 1193 (void) putc(c, stdout); 1194 } 1195 (void) ftpd_pclose(fin); 1196 reply(211, "End of Status"); 1197 } 1198 1199 void 1200 statcmd() 1201 { 1202 struct sockaddr_in *sin; 1203 u_char *a, *p; 1204 1205 lreply(211, "%s FTP server status:", hostname); 1206 lreply(211, "%s", version); 1207 if (isdigit(remotehost[0])) 1208 lreply(211, "Connected to %s", remotehost); 1209 else 1210 lreply(211, "Connected to %s (%s)", remotehost, 1211 inet_ntoa(his_addr.sin_addr)); 1212 if (logged_in) { 1213 if (guest) 1214 lreply(211, "Logged in anonymously"); 1215 else 1216 lreply(211, "Logged in as %s", pw->pw_name); 1217 } else if (askpasswd) 1218 lreply(211, "Waiting for password"); 1219 else 1220 lreply(211, "Waiting for user name"); 1221 printf("211- TYPE: %s", typenames[type]); 1222 if (type == TYPE_A || type == TYPE_E) 1223 printf(", FORM: %s", formnames[form]); 1224 if (type == TYPE_L) 1225 #if NBBY == 8 1226 printf(" %d", NBBY); 1227 #else 1228 printf(" %d", bytesize); /* need definition! */ 1229 #endif 1230 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1231 strunames[stru], modenames[mode]); 1232 if (data != -1) 1233 lreply(211, "Data connection open"); 1234 else if (pdata != -1) { 1235 printf("211- in Passive mode"); 1236 sin = &pasv_addr; 1237 goto printaddr; 1238 } else if (usedefault == 0) { 1239 printf("211- PORT"); 1240 sin = &data_dest; 1241 printaddr: 1242 a = (u_char *) &sin->sin_addr; 1243 p = (u_char *) &sin->sin_port; 1244 #define UC(b) (((int) b) & 0xff) 1245 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1246 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1247 #undef UC 1248 } else 1249 lreply(211, "No data connection"); 1250 1251 if (logged_in) { 1252 struct ftpconv *cp; 1253 1254 lreply(211, ""); 1255 lreply(211, "Class: %s", curclass.classname); 1256 if (curclass.display) 1257 lreply(211, "Display file: %s", curclass.display); 1258 if (curclass.notify) 1259 lreply(211, "Notify fileglob: %s", curclass.notify); 1260 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1261 curclass.timeout, curclass.maxtimeout); 1262 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1263 curclass.modify ? "en" : "dis"); 1264 lreply(211, "Umask: %.04o", curclass.umask); 1265 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1266 if (cp->suffix == NULL || cp->types == NULL || 1267 cp->command == NULL) 1268 continue; 1269 lreply(211, 1270 "Conversion: %s [%s] disable: %s, command: %s", 1271 cp->suffix, cp->types, cp->disable, cp->command); 1272 } 1273 } 1274 1275 reply(211, "End of status"); 1276 } 1277 1278 void 1279 fatal(s) 1280 char *s; 1281 { 1282 1283 reply(451, "Error in server: %s\n", s); 1284 reply(221, "Closing connection due to server error."); 1285 dologout(0); 1286 /* NOTREACHED */ 1287 } 1288 1289 void 1290 #if __STDC__ 1291 reply(int n, const char *fmt, ...) 1292 #else 1293 reply(n, fmt, va_alist) 1294 int n; 1295 char *fmt; 1296 va_dcl 1297 #endif 1298 { 1299 va_list ap; 1300 #if __STDC__ 1301 va_start(ap, fmt); 1302 #else 1303 va_start(ap); 1304 #endif 1305 (void)printf("%d ", n); 1306 (void)vprintf(fmt, ap); 1307 (void)printf("\r\n"); 1308 (void)fflush(stdout); 1309 if (debug) { 1310 syslog(LOG_DEBUG, "<--- %d ", n); 1311 vsyslog(LOG_DEBUG, fmt, ap); 1312 } 1313 } 1314 1315 void 1316 #if __STDC__ 1317 lreply(int n, const char *fmt, ...) 1318 #else 1319 lreply(n, fmt, va_alist) 1320 int n; 1321 char *fmt; 1322 va_dcl 1323 #endif 1324 { 1325 va_list ap; 1326 #if __STDC__ 1327 va_start(ap, fmt); 1328 #else 1329 va_start(ap); 1330 #endif 1331 (void)printf("%d- ", n); 1332 (void)vprintf(fmt, ap); 1333 (void)printf("\r\n"); 1334 (void)fflush(stdout); 1335 if (debug) { 1336 syslog(LOG_DEBUG, "<--- %d- ", n); 1337 vsyslog(LOG_DEBUG, fmt, ap); 1338 } 1339 } 1340 1341 static void 1342 ack(s) 1343 char *s; 1344 { 1345 1346 reply(250, "%s command successful.", s); 1347 } 1348 1349 void 1350 nack(s) 1351 char *s; 1352 { 1353 1354 reply(502, "%s command not implemented.", s); 1355 } 1356 1357 /* ARGSUSED */ 1358 void 1359 yyerror(s) 1360 char *s; 1361 { 1362 char *cp; 1363 1364 if ((cp = strchr(cbuf,'\n')) != NULL) 1365 *cp = '\0'; 1366 reply(500, "'%s': command not understood.", cbuf); 1367 } 1368 1369 void 1370 delete(name) 1371 char *name; 1372 { 1373 struct stat st; 1374 1375 LOGCMD("delete", name); 1376 if (stat(name, &st) < 0) { 1377 perror_reply(550, name); 1378 return; 1379 } 1380 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1381 if (rmdir(name) < 0) { 1382 perror_reply(550, name); 1383 return; 1384 } 1385 goto done; 1386 } 1387 if (unlink(name) < 0) { 1388 perror_reply(550, name); 1389 return; 1390 } 1391 done: 1392 ack("DELE"); 1393 } 1394 1395 void 1396 cwd(path) 1397 char *path; 1398 { 1399 1400 if (chdir(path) < 0) 1401 perror_reply(550, path); 1402 else { 1403 show_chdir_messages(250); 1404 ack("CWD"); 1405 } 1406 } 1407 1408 void 1409 makedir(name) 1410 char *name; 1411 { 1412 1413 LOGCMD("mkdir", name); 1414 if (mkdir(name, 0777) < 0) 1415 perror_reply(550, name); 1416 else 1417 reply(257, "MKD command successful."); 1418 } 1419 1420 void 1421 removedir(name) 1422 char *name; 1423 { 1424 1425 LOGCMD("rmdir", name); 1426 if (rmdir(name) < 0) 1427 perror_reply(550, name); 1428 else 1429 ack("RMD"); 1430 } 1431 1432 void 1433 pwd() 1434 { 1435 char path[MAXPATHLEN + 1]; 1436 1437 if (getwd(path) == (char *)NULL) 1438 reply(550, "%s.", path); 1439 else 1440 reply(257, "\"%s\" is current directory.", path); 1441 } 1442 1443 char * 1444 renamefrom(name) 1445 char *name; 1446 { 1447 struct stat st; 1448 1449 if (stat(name, &st) < 0) { 1450 perror_reply(550, name); 1451 return ((char *)0); 1452 } 1453 reply(350, "File exists, ready for destination name"); 1454 return (name); 1455 } 1456 1457 void 1458 renamecmd(from, to) 1459 char *from, *to; 1460 { 1461 1462 LOGCMD2("rename", from, to); 1463 if (rename(from, to) < 0) 1464 perror_reply(550, "rename"); 1465 else 1466 ack("RNTO"); 1467 } 1468 1469 static void 1470 dolog(sin) 1471 struct sockaddr_in *sin; 1472 { 1473 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1474 sizeof(struct in_addr), AF_INET); 1475 1476 if (hp) 1477 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1478 else 1479 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1480 sizeof(remotehost)); 1481 #ifdef HASSETPROCTITLE 1482 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1483 setproctitle(proctitle); 1484 #endif /* HASSETPROCTITLE */ 1485 1486 if (logging) 1487 syslog(LOG_INFO, "connection from %s", remotehost); 1488 } 1489 1490 /* 1491 * Record logout in wtmp file 1492 * and exit with supplied status. 1493 */ 1494 void 1495 dologout(status) 1496 int status; 1497 { 1498 /* 1499 * Prevent reception of SIGURG from resulting in a resumption 1500 * back to the main program loop. 1501 */ 1502 transflag = 0; 1503 1504 if (logged_in) { 1505 (void) seteuid((uid_t)0); 1506 logwtmp(ttyline, "", ""); 1507 #if defined(KERBEROS) 1508 if (!notickets && krbtkfile_env) 1509 unlink(krbtkfile_env); 1510 #endif 1511 } 1512 /* beware of flushing buffers after a SIGPIPE */ 1513 _exit(status); 1514 } 1515 1516 static void 1517 myoob(signo) 1518 int signo; 1519 { 1520 char *cp; 1521 1522 /* only process if transfer occurring */ 1523 if (!transflag) 1524 return; 1525 cp = tmpline; 1526 if (getline(cp, 7, stdin) == NULL) { 1527 reply(221, "You could at least say goodbye."); 1528 dologout(0); 1529 } 1530 upper(cp); 1531 if (strcmp(cp, "ABOR\r\n") == 0) { 1532 tmpline[0] = '\0'; 1533 reply(426, "Transfer aborted. Data connection closed."); 1534 reply(226, "Abort successful"); 1535 longjmp(urgcatch, 1); 1536 } 1537 if (strcmp(cp, "STAT\r\n") == 0) { 1538 if (file_size != (off_t) -1) 1539 reply(213, "Status: %qd of %qd bytes transferred", 1540 byte_count, file_size); 1541 else 1542 reply(213, "Status: %qd bytes transferred", byte_count); 1543 } 1544 } 1545 1546 /* 1547 * Note: a response of 425 is not mentioned as a possible response to 1548 * the PASV command in RFC959. However, it has been blessed as 1549 * a legitimate response by Jon Postel in a telephone conversation 1550 * with Rick Adams on 25 Jan 89. 1551 */ 1552 void 1553 passive() 1554 { 1555 int len; 1556 char *p, *a; 1557 1558 pdata = socket(AF_INET, SOCK_STREAM, 0); 1559 if (pdata < 0 || !logged_in) { 1560 perror_reply(425, "Can't open passive connection"); 1561 return; 1562 } 1563 pasv_addr = ctrl_addr; 1564 pasv_addr.sin_port = 0; 1565 (void) seteuid((uid_t)0); 1566 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1567 (void) seteuid((uid_t)pw->pw_uid); 1568 goto pasv_error; 1569 } 1570 (void) seteuid((uid_t)pw->pw_uid); 1571 len = sizeof(pasv_addr); 1572 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1573 goto pasv_error; 1574 if (listen(pdata, 1) < 0) 1575 goto pasv_error; 1576 a = (char *) &pasv_addr.sin_addr; 1577 p = (char *) &pasv_addr.sin_port; 1578 1579 #define UC(b) (((int) b) & 0xff) 1580 1581 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1582 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1583 return; 1584 1585 pasv_error: 1586 (void) close(pdata); 1587 pdata = -1; 1588 perror_reply(425, "Can't open passive connection"); 1589 return; 1590 } 1591 1592 /* 1593 * Generate unique name for file with basename "local". 1594 * The file named "local" is already known to exist. 1595 * Generates failure reply on error. 1596 */ 1597 static char * 1598 gunique(local) 1599 char *local; 1600 { 1601 static char new[MAXPATHLEN]; 1602 struct stat st; 1603 int count; 1604 char *cp; 1605 1606 cp = strrchr(local, '/'); 1607 if (cp) 1608 *cp = '\0'; 1609 if (stat(cp ? local : ".", &st) < 0) { 1610 perror_reply(553, cp ? local : "."); 1611 return ((char *) 0); 1612 } 1613 if (cp) 1614 *cp = '/'; 1615 (void) strcpy(new, local); 1616 cp = new + strlen(new); 1617 *cp++ = '.'; 1618 for (count = 1; count < 100; count++) { 1619 (void)sprintf(cp, "%d", count); 1620 if (stat(new, &st) < 0) 1621 return (new); 1622 } 1623 reply(452, "Unique file name cannot be created."); 1624 return (NULL); 1625 } 1626 1627 /* 1628 * Format and send reply containing system error number. 1629 */ 1630 void 1631 perror_reply(code, string) 1632 int code; 1633 char *string; 1634 { 1635 1636 reply(code, "%s: %s.", string, strerror(errno)); 1637 } 1638 1639 static char *onefile[] = { 1640 "", 1641 0 1642 }; 1643 1644 void 1645 send_file_list(whichf) 1646 char *whichf; 1647 { 1648 struct stat st; 1649 DIR *dirp = NULL; 1650 struct dirent *dir; 1651 FILE *dout = NULL; 1652 char **dirlist, *dirname; 1653 int simple = 0; 1654 int freeglob = 0; 1655 glob_t gl; 1656 #ifdef __GNUC__ 1657 (void) &dout; 1658 (void) &dirlist; 1659 (void) &simple; 1660 (void) &freeglob; 1661 #endif 1662 1663 if (strpbrk(whichf, "~{[*?") != NULL) { 1664 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1665 1666 memset(&gl, 0, sizeof(gl)); 1667 freeglob = 1; 1668 if (glob(whichf, flags, 0, &gl)) { 1669 reply(550, "not found"); 1670 goto out; 1671 } else if (gl.gl_pathc == 0) { 1672 errno = ENOENT; 1673 perror_reply(550, whichf); 1674 goto out; 1675 } 1676 dirlist = gl.gl_pathv; 1677 } else { 1678 onefile[0] = whichf; 1679 dirlist = onefile; 1680 simple = 1; 1681 } 1682 1683 if (setjmp(urgcatch)) { 1684 transflag = 0; 1685 goto out; 1686 } 1687 while ((dirname = *dirlist++) != NULL) { 1688 if (stat(dirname, &st) < 0) { 1689 /* 1690 * If user typed "ls -l", etc, and the client 1691 * used NLST, do what the user meant. 1692 */ 1693 if (dirname[0] == '-' && *dirlist == NULL && 1694 transflag == 0) { 1695 retrieve("/bin/ls %s", dirname); 1696 goto out; 1697 } 1698 perror_reply(550, whichf); 1699 if (dout != NULL) { 1700 (void) fclose(dout); 1701 transflag = 0; 1702 data = -1; 1703 pdata = -1; 1704 } 1705 goto out; 1706 } 1707 1708 if (S_ISREG(st.st_mode)) { 1709 if (dout == NULL) { 1710 dout = dataconn("file list", (off_t)-1, "w"); 1711 if (dout == NULL) 1712 goto out; 1713 transflag++; 1714 } 1715 fprintf(dout, "%s%s\n", dirname, 1716 type == TYPE_A ? "\r" : ""); 1717 byte_count += strlen(dirname) + 1; 1718 continue; 1719 } else if (!S_ISDIR(st.st_mode)) 1720 continue; 1721 1722 if ((dirp = opendir(dirname)) == NULL) 1723 continue; 1724 1725 while ((dir = readdir(dirp)) != NULL) { 1726 char nbuf[MAXPATHLEN]; 1727 1728 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1729 continue; 1730 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1731 dir->d_namlen == 2) 1732 continue; 1733 1734 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1735 1736 /* 1737 * We have to do a stat to insure it's 1738 * not a directory or special file. 1739 */ 1740 if (simple || (stat(nbuf, &st) == 0 && 1741 S_ISREG(st.st_mode))) { 1742 if (dout == NULL) { 1743 dout = dataconn("file list", (off_t)-1, 1744 "w"); 1745 if (dout == NULL) 1746 goto out; 1747 transflag++; 1748 } 1749 if (nbuf[0] == '.' && nbuf[1] == '/') 1750 fprintf(dout, "%s%s\n", &nbuf[2], 1751 type == TYPE_A ? "\r" : ""); 1752 else 1753 fprintf(dout, "%s%s\n", nbuf, 1754 type == TYPE_A ? "\r" : ""); 1755 byte_count += strlen(nbuf) + 1; 1756 } 1757 } 1758 (void) closedir(dirp); 1759 } 1760 1761 if (dout == NULL) 1762 reply(550, "No files found."); 1763 else if (ferror(dout) != 0) 1764 perror_reply(550, "Data connection"); 1765 else 1766 reply(226, "Transfer complete."); 1767 1768 transflag = 0; 1769 if (dout != NULL) 1770 (void) fclose(dout); 1771 data = -1; 1772 pdata = -1; 1773 out: 1774 if (freeglob) { 1775 freeglob = 0; 1776 globfree(&gl); 1777 } 1778 } 1779
Indexes created Tue Sep 23 07:09:52 GMT 2025