ftpd.c revision 1.29
1 /* $NetBSD: ftpd.c,v 1.29 1997/07/21 05:13:10 mrg 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 1.29 1997/07/21 05:13:10 mrg 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, \ 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 send_data __P((FILE *, FILE *, off_t)); 191 static struct passwd * 192 sgetpwnam __P((char *)); 193 static char *sgetsave __P((char *)); 194 195 int main __P((int, char *[], char **)); 196 197 #if defined (KERBEROS) 198 int klogin __P((struct passwd *, char *, char *, char *)); 199 #endif 200 201 static char * 202 curdir() 203 { 204 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 205 206 if (getcwd(path, sizeof(path)-2) == NULL) 207 return (""); 208 if (path[1] != '\0') /* special case for root dir. */ 209 strcat(path, "/"); 210 /* For guest account, skip / since it's chrooted */ 211 return (guest ? path+1 : path); 212 } 213 214 int 215 main(argc, argv, envp) 216 int argc; 217 char *argv[]; 218 char **envp; 219 { 220 int addrlen, ch, on = 1, tos; 221 char *cp, line[LINE_MAX]; 222 FILE *fd; 223 224 /* 225 * LOG_NDELAY sets up the logging connection immediately, 226 * necessary for anonymous ftp's that chroot and can't do it later. 227 */ 228 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 229 addrlen = sizeof(his_addr); 230 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 231 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 232 exit(1); 233 } 234 addrlen = sizeof(ctrl_addr); 235 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 236 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 237 exit(1); 238 } 239 #ifdef IP_TOS 240 tos = IPTOS_LOWDELAY; 241 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 242 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 243 #endif 244 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 245 debug = 0; 246 247 /* set this here so klogin can use it... */ 248 (void)snprintf(ttyline, sizeof ttyline, "ftp%d", getpid()); 249 250 while ((ch = getopt(argc, argv, "a:dlt:T:u:v")) != EOF) { 251 switch (ch) { 252 case 'a': 253 anondir = optarg; 254 break; 255 256 case 'd': 257 case 'v': /* deprecated */ 258 debug = 1; 259 break; 260 261 case 'l': 262 logging++; /* > 1 == extra logging */ 263 break; 264 265 case 't': 266 case 'T': 267 case 'u': 268 warnx("-%c has be deprecated in favour of ftpd.conf", 269 ch); 270 break; 271 272 default: 273 warnx("unknown flag -%c ignored", optopt); 274 break; 275 } 276 } 277 (void) freopen(_PATH_DEVNULL, "w", stderr); 278 (void) signal(SIGPIPE, lostconn); 279 (void) signal(SIGCHLD, SIG_IGN); 280 if ((long)signal(SIGURG, myoob) < 0) 281 syslog(LOG_ERR, "signal: %m"); 282 283 /* Try to handle urgent data inline */ 284 #ifdef SO_OOBINLINE 285 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 286 syslog(LOG_ERR, "setsockopt: %m"); 287 #endif 288 289 #ifdef F_SETOWN 290 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 291 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 292 #endif 293 dolog(&his_addr); 294 /* 295 * Set up default state 296 */ 297 data = -1; 298 type = TYPE_A; 299 form = FORM_N; 300 stru = STRU_F; 301 mode = MODE_S; 302 tmpline[0] = '\0'; 303 304 /* If logins are disabled, print out the message. */ 305 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 306 while (fgets(line, sizeof(line), fd) != NULL) { 307 if ((cp = strchr(line, '\n')) != NULL) 308 *cp = '\0'; 309 lreply(530, "%s", line); 310 } 311 (void) fflush(stdout); 312 (void) fclose(fd); 313 reply(530, "System not available."); 314 exit(0); 315 } 316 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 317 while (fgets(line, sizeof(line), fd) != NULL) { 318 if ((cp = strchr(line, '\n')) != NULL) 319 *cp = '\0'; 320 lreply(220, "%s", line); 321 } 322 (void) fflush(stdout); 323 (void) fclose(fd); 324 /* reply(220,) must follow */ 325 } 326 (void) gethostname(hostname, sizeof(hostname)); 327 reply(220, "%s FTP server (%s) ready.", hostname, version); 328 (void) setjmp(errcatch); 329 for (;;) 330 (void) yyparse(); 331 /* NOTREACHED */ 332 } 333 334 static void 335 lostconn(signo) 336 int signo; 337 { 338 339 if (debug) 340 syslog(LOG_DEBUG, "lost connection"); 341 dologout(-1); 342 } 343 344 /* 345 * Helper function for sgetpwnam(). 346 */ 347 static char * 348 sgetsave(s) 349 char *s; 350 { 351 char *new = malloc((unsigned) strlen(s) + 1); 352 353 if (new == NULL) { 354 perror_reply(421, "Local resource failure: malloc"); 355 dologout(1); 356 /* NOTREACHED */ 357 } 358 (void) strcpy(new, s); 359 return (new); 360 } 361 362 /* 363 * Save the result of a getpwnam. Used for USER command, since 364 * the data returned must not be clobbered by any other command 365 * (e.g., globbing). 366 */ 367 static struct passwd * 368 sgetpwnam(name) 369 char *name; 370 { 371 static struct passwd save; 372 struct passwd *p; 373 374 if ((p = getpwnam(name)) == NULL) 375 return (p); 376 if (save.pw_name) { 377 free(save.pw_name); 378 free(save.pw_passwd); 379 free(save.pw_gecos); 380 free(save.pw_dir); 381 free(save.pw_shell); 382 } 383 save = *p; 384 save.pw_name = sgetsave(p->pw_name); 385 save.pw_passwd = sgetsave(p->pw_passwd); 386 save.pw_gecos = sgetsave(p->pw_gecos); 387 save.pw_dir = sgetsave(p->pw_dir); 388 save.pw_shell = sgetsave(p->pw_shell); 389 return (&save); 390 } 391 392 static int login_attempts; /* number of failed login attempts */ 393 static int askpasswd; /* had user command, ask for passwd */ 394 static char curname[10]; /* current USER name */ 395 396 /* 397 * USER command. 398 * Sets global passwd pointer pw if named account exists and is acceptable; 399 * sets askpasswd if a PASS command is expected. If logged in previously, 400 * need to reset state. If name is "ftp" or "anonymous", the name is not in 401 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 402 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 403 * requesting login privileges. Disallow anyone who does not have a standard 404 * shell as returned by getusershell(). Disallow anyone mentioned in the file 405 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 406 */ 407 void 408 user(name) 409 char *name; 410 { 411 if (logged_in) { 412 if (guest) { 413 reply(530, "Can't change user from guest login."); 414 return; 415 } else if (dochroot) { 416 reply(530, "Can't change user from chroot user."); 417 return; 418 } 419 end_login(); 420 } 421 422 guest = 0; 423 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 424 if (checkaccess("ftp") || checkaccess("anonymous")) 425 reply(530, "User %s access denied.", name); 426 else if ((pw = sgetpwnam("ftp")) != NULL) { 427 guest = 1; 428 askpasswd = 1; 429 reply(331, 430 "Guest login ok, type your name as password."); 431 } else 432 reply(530, "User %s unknown.", name); 433 if (!askpasswd && logging) 434 syslog(LOG_NOTICE, 435 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 436 return; 437 } 438 pw = sgetpwnam(name); 439 if (logging) 440 strncpy(curname, name, sizeof(curname)-1); 441 #ifdef SKEY 442 if (!skey_haskey(name)) { 443 char *myskey, *skey_keyinfo __P((char *name)); 444 445 myskey = skey_keyinfo(name); 446 reply(331, "Password [%s] for %s required.", 447 myskey ? myskey : "error getting challenge", name); 448 } else 449 #endif 450 reply(331, "Password required for %s.", name); 451 452 askpasswd = 1; 453 /* 454 * Delay before reading passwd after first failed 455 * attempt to slow down passwd-guessing programs. 456 */ 457 if (login_attempts) 458 sleep((unsigned) login_attempts); 459 } 460 461 /* 462 * Check if a user is in the file "fname" 463 */ 464 static int 465 checkuser(fname, name) 466 char *fname; 467 char *name; 468 { 469 FILE *fd; 470 int found = 0; 471 char *p, line[BUFSIZ]; 472 473 if ((fd = fopen(fname, "r")) != NULL) { 474 while (fgets(line, sizeof(line), fd) != NULL) 475 if ((p = strchr(line, '\n')) != NULL) { 476 *p = '\0'; 477 if (line[0] == '#') 478 continue; 479 if (strcmp(line, name) == 0) { 480 found = 1; 481 break; 482 } 483 } 484 (void) fclose(fd); 485 } 486 return (found); 487 } 488 489 /* 490 * Determine whether a user has access, based on information in 491 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 492 * `allow' or `deny' (with deny being the default if anything but 493 * `allow', or nothing at all, is specified). 494 * 495 * Each glob is matched against the username in turn, and the first 496 * match found is used. If no match is found, access is allowed. 497 * 498 * Any line starting with `#' is considered a comment and ignored. 499 * 500 * This is probably not the best way to do this, but it preserves 501 * the old semantics where if a user was listed in the file he was 502 * denied, otherwise he was allowed. 503 * 504 * There is one change in the semantics, however; ftpd will now `fail 505 * safe' and deny all access if there's no /etc/ftpusers file. 506 * 507 * Return 1 if the user is denied, or 0 if he is allowed. 508 */ 509 static int 510 checkaccess(name) 511 char *name; 512 { 513 #define ALLOWED 0 514 #define NOT_ALLOWED 1 515 FILE *fd; 516 int retval = ALLOWED; 517 char *glob, *perm, line[BUFSIZ]; 518 519 if ((fd = fopen(_PATH_FTPUSERS, "r")) == NULL) 520 return NOT_ALLOWED; 521 522 while (fgets(line, sizeof(line), fd) != NULL) { 523 glob = strtok(line, " \t\n"); 524 if (glob[0] == '#') 525 continue; 526 perm = strtok(NULL, " \t\n"); 527 if (fnmatch(glob, name, 0) == 0) { 528 if (perm != NULL && strcmp(perm, "allow") == 0) 529 retval = ALLOWED; 530 else 531 retval = NOT_ALLOWED; 532 break; 533 } 534 } 535 (void) fclose(fd); 536 return (retval); 537 538 } 539 #undef ALLOWED 540 #undef NOT_ALLOWED 541 542 /* 543 * Terminate login as previous user, if any, resetting state; 544 * used when USER command is given or login fails. 545 */ 546 static void 547 end_login() 548 { 549 550 (void) seteuid((uid_t)0); 551 if (logged_in) 552 logwtmp(ttyline, "", ""); 553 pw = NULL; 554 logged_in = 0; 555 guest = 0; 556 dochroot = 0; 557 } 558 559 void 560 pass(passwd) 561 char *passwd; 562 { 563 int rval; 564 FILE *fd; 565 char *cp, *shell; 566 567 if (logged_in || askpasswd == 0) { 568 reply(503, "Login with USER first."); 569 return; 570 } 571 askpasswd = 0; 572 if (!guest) { /* "ftp" is only account allowed no password */ 573 if (pw == NULL) { 574 rval = 1; /* failure below */ 575 goto skip; 576 } 577 #if defined(KERBEROS) 578 rval = klogin(pw, "", hostname, passwd); 579 if (rval == 0) 580 goto skip; 581 #endif 582 #ifdef SKEY 583 if (skey_haskey(pw->pw_name) == 0 && 584 (skey_passcheck(pw->pw_name, passwd) != -1)) { 585 rval = 0; 586 goto skip; 587 } 588 #endif 589 /* the strcmp does not catch null passwords! */ 590 if (pw == NULL || *pw->pw_passwd == '\0' || 591 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 592 rval = 1; /* failure */ 593 goto skip; 594 } 595 rval = 0; 596 597 skip: 598 /* 599 * If rval == 1, the user failed the authentication check 600 * above. If rval == 0, either Kerberos or local authentication 601 * succeeded. 602 */ 603 if (rval) { 604 reply(530, "Login incorrect."); 605 if (logging) { 606 syslog(LOG_NOTICE, 607 "FTP LOGIN FAILED FROM %s", remotehost); 608 syslog(LOG_AUTHPRIV | LOG_NOTICE, 609 "FTP LOGIN FAILED FROM %s, %s", 610 remotehost, curname); 611 } 612 pw = NULL; 613 if (login_attempts++ >= 5) { 614 syslog(LOG_NOTICE, 615 "repeated login failures from %s", 616 remotehost); 617 exit(0); 618 } 619 return; 620 } 621 } 622 623 /* password was ok; see if anything else prevents login */ 624 if (checkaccess(pw->pw_name)) { 625 reply(530, "User %s may not use FTP.", pw->pw_name); 626 if (logging) 627 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 628 remotehost, pw->pw_name); 629 pw = (struct passwd *) NULL; 630 return; 631 } 632 /* check for valid shell, if not guest user */ 633 if ((shell = pw->pw_shell) == NULL || *shell == 0) 634 shell = _PATH_BSHELL; 635 while ((cp = getusershell()) != NULL) 636 if (strcmp(cp, shell) == 0) 637 break; 638 endusershell(); 639 if (cp == NULL && guest == 0) { 640 reply(530, "User %s may not use FTP.", pw->pw_name); 641 if (logging) 642 syslog(LOG_NOTICE, 643 "FTP LOGIN REFUSED FROM %s, %s", 644 remotehost, pw->pw_name); 645 pw = (struct passwd *) NULL; 646 return; 647 } 648 649 login_attempts = 0; /* this time successful */ 650 if (setegid((gid_t)pw->pw_gid) < 0) { 651 reply(550, "Can't set gid."); 652 return; 653 } 654 (void) initgroups(pw->pw_name, pw->pw_gid); 655 656 /* open wtmp before chroot */ 657 logwtmp(ttyline, pw->pw_name, remotehost); 658 logged_in = 1; 659 660 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 661 662 /* parse ftpd.conf, setting up various parameters */ 663 if (guest) 664 parse_conf(CLASS_GUEST); 665 else if (dochroot) 666 parse_conf(CLASS_CHROOT); 667 else 668 parse_conf(CLASS_REAL); 669 670 if (guest) { 671 /* 672 * We MUST do a chdir() after the chroot. Otherwise 673 * the old current directory will be accessible as "." 674 * outside the new root! 675 */ 676 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 677 chdir("/") < 0) { 678 reply(550, "Can't set guest privileges."); 679 goto bad; 680 } 681 } else if (dochroot) { 682 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 683 reply(550, "Can't change root."); 684 goto bad; 685 } 686 } else if (chdir(pw->pw_dir) < 0) { 687 if (chdir("/") < 0) { 688 reply(530, "User %s: can't change directory to %s.", 689 pw->pw_name, pw->pw_dir); 690 goto bad; 691 } else 692 lreply(230, "No directory! Logging in with home=/"); 693 } 694 if (seteuid((uid_t)pw->pw_uid) < 0) { 695 reply(550, "Can't set uid."); 696 goto bad; 697 } 698 /* 699 * Display a login message, if it exists. 700 * N.B. reply(230,) must follow the message. 701 */ 702 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 703 char *cp, line[LINE_MAX]; 704 705 while (fgets(line, sizeof(line), fd) != NULL) { 706 if ((cp = strchr(line, '\n')) != NULL) 707 *cp = '\0'; 708 lreply(230, "%s", line); 709 } 710 (void) fflush(stdout); 711 (void) fclose(fd); 712 } 713 show_chdir_messages(230); 714 if (guest) { 715 reply(230, "Guest login ok, access restrictions apply."); 716 #ifdef HASSETPROCTITLE 717 snprintf(proctitle, sizeof(proctitle), 718 "%s: anonymous/%.*s", remotehost, 719 (int) (sizeof(proctitle) - sizeof(remotehost) - 720 sizeof(": anonymous/")), passwd); 721 setproctitle(proctitle); 722 #endif /* HASSETPROCTITLE */ 723 if (logging) 724 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 725 remotehost, passwd); 726 } else { 727 reply(230, "User %s logged in.", pw->pw_name); 728 #ifdef HASSETPROCTITLE 729 snprintf(proctitle, sizeof(proctitle), 730 "%s: %s", remotehost, pw->pw_name); 731 setproctitle(proctitle); 732 #endif /* HASSETPROCTITLE */ 733 if (logging) 734 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 735 remotehost, pw->pw_name); 736 } 737 (void) umask(curclass.umask); 738 return; 739 bad: 740 /* Forget all about it... */ 741 end_login(); 742 } 743 744 void 745 retrieve(cmd, name) 746 char *cmd, *name; 747 { 748 FILE *fin = NULL, *dout; 749 struct stat st; 750 int (*closefunc) __P((FILE *)) = NULL; 751 int log; 752 753 log = (cmd == 0); 754 if (cmd == 0) { 755 fin = fopen(name, "r"), closefunc = fclose; 756 if (fin == NULL) 757 cmd = do_conversion(name); 758 } 759 if (cmd) { 760 char line[BUFSIZ]; 761 762 (void)snprintf(line, sizeof line, cmd, name), name = line; 763 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 764 st.st_size = -1; 765 st.st_blksize = BUFSIZ; 766 } 767 if (fin == NULL) { 768 if (errno != 0) { 769 perror_reply(550, name); 770 if (log) { 771 LOGCMD("get", name); 772 } 773 } 774 return; 775 } 776 byte_count = -1; 777 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 778 reply(550, "%s: not a plain file.", name); 779 goto done; 780 } 781 if (restart_point) { 782 if (type == TYPE_A) { 783 off_t i, n; 784 int c; 785 786 n = restart_point; 787 i = 0; 788 while (i++ < n) { 789 if ((c=getc(fin)) == EOF) { 790 perror_reply(550, name); 791 goto done; 792 } 793 if (c == '\n') 794 i++; 795 } 796 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 797 perror_reply(550, name); 798 goto done; 799 } 800 } 801 dout = dataconn(name, st.st_size, "w"); 802 if (dout == NULL) 803 goto done; 804 send_data(fin, dout, st.st_blksize); 805 (void) fclose(dout); 806 data = -1; 807 pdata = -1; 808 done: 809 if (log) 810 LOGBYTES("get", name, byte_count); 811 (*closefunc)(fin); 812 } 813 814 void 815 store(name, mode, unique) 816 char *name, *mode; 817 int unique; 818 { 819 FILE *fout, *din; 820 struct stat st; 821 int (*closefunc) __P((FILE *)); 822 823 if (unique && stat(name, &st) == 0 && 824 (name = gunique(name)) == NULL) { 825 LOGCMD(*mode == 'w' ? "put" : "append", name); 826 return; 827 } 828 829 if (restart_point) 830 mode = "r+"; 831 fout = fopen(name, mode); 832 closefunc = fclose; 833 if (fout == NULL) { 834 perror_reply(553, name); 835 LOGCMD(*mode == 'w' ? "put" : "append", name); 836 return; 837 } 838 byte_count = -1; 839 if (restart_point) { 840 if (type == TYPE_A) { 841 off_t i, n; 842 int c; 843 844 n = restart_point; 845 i = 0; 846 while (i++ < n) { 847 if ((c=getc(fout)) == EOF) { 848 perror_reply(550, name); 849 goto done; 850 } 851 if (c == '\n') 852 i++; 853 } 854 /* 855 * We must do this seek to "current" position 856 * because we are changing from reading to 857 * writing. 858 */ 859 if (fseek(fout, 0L, SEEK_CUR) < 0) { 860 perror_reply(550, name); 861 goto done; 862 } 863 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 864 perror_reply(550, name); 865 goto done; 866 } 867 } 868 din = dataconn(name, (off_t)-1, "r"); 869 if (din == NULL) 870 goto done; 871 if (receive_data(din, fout) == 0) { 872 if (unique) 873 reply(226, "Transfer complete (unique file name:%s).", 874 name); 875 else 876 reply(226, "Transfer complete."); 877 } 878 (void) fclose(din); 879 data = -1; 880 pdata = -1; 881 done: 882 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 883 (*closefunc)(fout); 884 } 885 886 static FILE * 887 getdatasock(mode) 888 char *mode; 889 { 890 int on = 1, s, t, tries; 891 892 if (data >= 0) 893 return (fdopen(data, mode)); 894 (void) seteuid((uid_t)0); 895 s = socket(AF_INET, SOCK_STREAM, 0); 896 if (s < 0) 897 goto bad; 898 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 899 (char *) &on, sizeof(on)) < 0) 900 goto bad; 901 /* anchor socket to avoid multi-homing problems */ 902 data_source.sin_len = sizeof(struct sockaddr_in); 903 data_source.sin_family = AF_INET; 904 data_source.sin_addr = ctrl_addr.sin_addr; 905 for (tries = 1; ; tries++) { 906 if (bind(s, (struct sockaddr *)&data_source, 907 sizeof(data_source)) >= 0) 908 break; 909 if (errno != EADDRINUSE || tries > 10) 910 goto bad; 911 sleep(tries); 912 } 913 (void) seteuid((uid_t)pw->pw_uid); 914 #ifdef IP_TOS 915 on = IPTOS_THROUGHPUT; 916 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 917 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 918 #endif 919 return (fdopen(s, mode)); 920 bad: 921 /* Return the real value of errno (close may change it) */ 922 t = errno; 923 (void) seteuid((uid_t)pw->pw_uid); 924 (void) close(s); 925 errno = t; 926 return (NULL); 927 } 928 929 static FILE * 930 dataconn(name, size, mode) 931 char *name; 932 off_t size; 933 char *mode; 934 { 935 char sizebuf[32]; 936 FILE *file; 937 int retry = 0, tos; 938 939 file_size = size; 940 byte_count = 0; 941 if (size != (off_t) -1) 942 (void)snprintf(sizebuf, sizeof sizebuf, " (%qd bytes)", 943 (long long)size); 944 else 945 sizebuf[0] = '\0'; 946 if (pdata >= 0) { 947 struct sockaddr_in from; 948 int s, fromlen = sizeof(from); 949 950 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 951 if (s < 0) { 952 reply(425, "Can't open data connection."); 953 (void) close(pdata); 954 pdata = -1; 955 return (NULL); 956 } 957 (void) close(pdata); 958 pdata = s; 959 #ifdef IP_TOS 960 tos = IPTOS_THROUGHPUT; 961 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 962 sizeof(int)); 963 #endif 964 reply(150, "Opening %s mode data connection for '%s'%s.", 965 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 966 return (fdopen(pdata, mode)); 967 } 968 if (data >= 0) { 969 reply(125, "Using existing data connection for '%s'%s.", 970 name, sizebuf); 971 usedefault = 1; 972 return (fdopen(data, mode)); 973 } 974 if (usedefault) 975 data_dest = his_addr; 976 usedefault = 1; 977 file = getdatasock(mode); 978 if (file == NULL) { 979 reply(425, "Can't create data socket (%s,%d): %s.", 980 inet_ntoa(data_source.sin_addr), 981 ntohs(data_source.sin_port), strerror(errno)); 982 return (NULL); 983 } 984 data = fileno(file); 985 while (connect(data, (struct sockaddr *)&data_dest, 986 sizeof(data_dest)) < 0) { 987 if (errno == EADDRINUSE && retry < swaitmax) { 988 sleep((unsigned) swaitint); 989 retry += swaitint; 990 continue; 991 } 992 perror_reply(425, "Can't build data connection"); 993 (void) fclose(file); 994 data = -1; 995 return (NULL); 996 } 997 reply(150, "Opening %s mode data connection for '%s'%s.", 998 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 999 return (file); 1000 } 1001 1002 /* 1003 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1004 * encapsulation of the data subject * to Mode, Structure, and Type. 1005 * 1006 * NB: Form isn't handled. 1007 */ 1008 static void 1009 send_data(instr, outstr, blksize) 1010 FILE *instr, *outstr; 1011 off_t blksize; 1012 { 1013 int c, cnt, filefd, netfd; 1014 char *buf; 1015 1016 transflag++; 1017 if (setjmp(urgcatch)) { 1018 transflag = 0; 1019 return; 1020 } 1021 1022 switch (type) { 1023 1024 case TYPE_A: 1025 while ((c = getc(instr)) != EOF) { 1026 byte_count++; 1027 if (c == '\n') { 1028 if (ferror(outstr)) 1029 goto data_err; 1030 (void) putc('\r', outstr); 1031 } 1032 (void) putc(c, outstr); 1033 } 1034 fflush(outstr); 1035 transflag = 0; 1036 if (ferror(instr)) 1037 goto file_err; 1038 if (ferror(outstr)) 1039 goto data_err; 1040 reply(226, "Transfer complete."); 1041 return; 1042 1043 case TYPE_I: 1044 case TYPE_L: 1045 if ((buf = malloc((u_int)blksize)) == NULL) { 1046 transflag = 0; 1047 perror_reply(451, "Local resource failure: malloc"); 1048 return; 1049 } 1050 netfd = fileno(outstr); 1051 filefd = fileno(instr); 1052 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1053 write(netfd, buf, cnt) == cnt) 1054 byte_count += cnt; 1055 transflag = 0; 1056 (void)free(buf); 1057 if (cnt != 0) { 1058 if (cnt < 0) 1059 goto file_err; 1060 goto data_err; 1061 } 1062 reply(226, "Transfer complete."); 1063 return; 1064 default: 1065 transflag = 0; 1066 reply(550, "Unimplemented TYPE %d in send_data", type); 1067 return; 1068 } 1069 1070 data_err: 1071 transflag = 0; 1072 perror_reply(426, "Data connection"); 1073 return; 1074 1075 file_err: 1076 transflag = 0; 1077 perror_reply(551, "Error on input file"); 1078 } 1079 1080 /* 1081 * Transfer data from peer to "outstr" using the appropriate encapulation of 1082 * the data subject to Mode, Structure, and Type. 1083 * 1084 * N.B.: Form isn't handled. 1085 */ 1086 static int 1087 receive_data(instr, outstr) 1088 FILE *instr, *outstr; 1089 { 1090 int c, cnt, bare_lfs; 1091 char buf[BUFSIZ]; 1092 #ifdef __GNUC__ 1093 (void) &bare_lfs; 1094 #endif 1095 1096 bare_lfs = 0; 1097 transflag++; 1098 if (setjmp(urgcatch)) { 1099 transflag = 0; 1100 return (-1); 1101 } 1102 1103 switch (type) { 1104 1105 case TYPE_I: 1106 case TYPE_L: 1107 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1108 if (write(fileno(outstr), buf, cnt) != cnt) 1109 goto file_err; 1110 byte_count += cnt; 1111 } 1112 if (cnt < 0) 1113 goto data_err; 1114 transflag = 0; 1115 return (0); 1116 1117 case TYPE_E: 1118 reply(553, "TYPE E not implemented."); 1119 transflag = 0; 1120 return (-1); 1121 1122 case TYPE_A: 1123 while ((c = getc(instr)) != EOF) { 1124 byte_count++; 1125 if (c == '\n') 1126 bare_lfs++; 1127 while (c == '\r') { 1128 if (ferror(outstr)) 1129 goto data_err; 1130 if ((c = getc(instr)) != '\n') { 1131 (void) putc ('\r', outstr); 1132 if (c == '\0' || c == EOF) 1133 goto contin2; 1134 } 1135 } 1136 (void) putc(c, outstr); 1137 contin2: ; 1138 } 1139 fflush(outstr); 1140 if (ferror(instr)) 1141 goto data_err; 1142 if (ferror(outstr)) 1143 goto file_err; 1144 transflag = 0; 1145 if (bare_lfs) { 1146 lreply(226, 1147 "WARNING! %d bare linefeeds received in ASCII mode", 1148 bare_lfs); 1149 (void)printf(" File may not have transferred correctly.\r\n"); 1150 } 1151 return (0); 1152 default: 1153 reply(550, "Unimplemented TYPE %d in receive_data", type); 1154 transflag = 0; 1155 return (-1); 1156 } 1157 1158 data_err: 1159 transflag = 0; 1160 perror_reply(426, "Data Connection"); 1161 return (-1); 1162 1163 file_err: 1164 transflag = 0; 1165 perror_reply(452, "Error writing file"); 1166 return (-1); 1167 } 1168 1169 void 1170 statfilecmd(filename) 1171 char *filename; 1172 { 1173 FILE *fin; 1174 int c; 1175 char line[LINE_MAX]; 1176 1177 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1178 fin = ftpd_popen(line, "r", 0); 1179 lreply(211, "status of %s:", filename); 1180 while ((c = getc(fin)) != EOF) { 1181 if (c == '\n') { 1182 if (ferror(stdout)){ 1183 perror_reply(421, "control connection"); 1184 (void) ftpd_pclose(fin); 1185 dologout(1); 1186 /* NOTREACHED */ 1187 } 1188 if (ferror(fin)) { 1189 perror_reply(551, filename); 1190 (void) ftpd_pclose(fin); 1191 return; 1192 } 1193 (void) putc('\r', stdout); 1194 } 1195 (void) putc(c, stdout); 1196 } 1197 (void) ftpd_pclose(fin); 1198 reply(211, "End of Status"); 1199 } 1200 1201 void 1202 statcmd() 1203 { 1204 struct sockaddr_in *sin; 1205 u_char *a, *p; 1206 1207 lreply(211, "%s FTP server status:", hostname); 1208 lreply(211, "%s", version); 1209 if (isdigit(remotehost[0])) 1210 lreply(211, "Connected to %s", remotehost); 1211 else 1212 lreply(211, "Connected to %s (%s)", remotehost, 1213 inet_ntoa(his_addr.sin_addr)); 1214 if (logged_in) { 1215 if (guest) 1216 lreply(211, "Logged in anonymously"); 1217 else 1218 lreply(211, "Logged in as %s", pw->pw_name); 1219 } else if (askpasswd) 1220 lreply(211, "Waiting for password"); 1221 else 1222 lreply(211, "Waiting for user name"); 1223 printf("211- TYPE: %s", typenames[type]); 1224 if (type == TYPE_A || type == TYPE_E) 1225 printf(", FORM: %s", formnames[form]); 1226 if (type == TYPE_L) 1227 #if NBBY == 8 1228 printf(" %d", NBBY); 1229 #else 1230 printf(" %d", bytesize); /* need definition! */ 1231 #endif 1232 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1233 strunames[stru], modenames[mode]); 1234 if (data != -1) 1235 lreply(211, "Data connection open"); 1236 else if (pdata != -1) { 1237 printf("211- in Passive mode"); 1238 sin = &pasv_addr; 1239 goto printaddr; 1240 } else if (usedefault == 0) { 1241 printf("211- PORT"); 1242 sin = &data_dest; 1243 printaddr: 1244 a = (u_char *) &sin->sin_addr; 1245 p = (u_char *) &sin->sin_port; 1246 #define UC(b) (((int) b) & 0xff) 1247 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1248 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1249 #undef UC 1250 } else 1251 lreply(211, "No data connection"); 1252 1253 if (logged_in) { 1254 struct ftpconv *cp; 1255 1256 lreply(211, ""); 1257 lreply(211, "Class: %s", curclass.classname); 1258 if (curclass.display) 1259 lreply(211, "Display file: %s", curclass.display); 1260 if (curclass.notify) 1261 lreply(211, "Notify fileglob: %s", curclass.notify); 1262 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1263 curclass.timeout, curclass.maxtimeout); 1264 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1265 curclass.modify ? "en" : "dis"); 1266 lreply(211, "Umask: %.04o", curclass.umask); 1267 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1268 if (cp->suffix == NULL || cp->types == NULL || 1269 cp->command == NULL) 1270 continue; 1271 lreply(211, 1272 "Conversion: %s [%s] disable: %s, command: %s", 1273 cp->suffix, cp->types, cp->disable, cp->command); 1274 } 1275 } 1276 1277 reply(211, "End of status"); 1278 } 1279 1280 void 1281 fatal(s) 1282 char *s; 1283 { 1284 1285 reply(451, "Error in server: %s\n", s); 1286 reply(221, "Closing connection due to server error."); 1287 dologout(0); 1288 /* NOTREACHED */ 1289 } 1290 1291 void 1292 #if __STDC__ 1293 reply(int n, const char *fmt, ...) 1294 #else 1295 reply(n, fmt, va_alist) 1296 int n; 1297 char *fmt; 1298 va_dcl 1299 #endif 1300 { 1301 va_list ap; 1302 #if __STDC__ 1303 va_start(ap, fmt); 1304 #else 1305 va_start(ap); 1306 #endif 1307 (void)printf("%d ", n); 1308 (void)vprintf(fmt, ap); 1309 (void)printf("\r\n"); 1310 (void)fflush(stdout); 1311 if (debug) { 1312 syslog(LOG_DEBUG, "<--- %d ", n); 1313 vsyslog(LOG_DEBUG, fmt, ap); 1314 } 1315 } 1316 1317 void 1318 #if __STDC__ 1319 lreply(int n, const char *fmt, ...) 1320 #else 1321 lreply(n, fmt, va_alist) 1322 int n; 1323 char *fmt; 1324 va_dcl 1325 #endif 1326 { 1327 va_list ap; 1328 #if __STDC__ 1329 va_start(ap, fmt); 1330 #else 1331 va_start(ap); 1332 #endif 1333 (void)printf("%d- ", n); 1334 (void)vprintf(fmt, ap); 1335 (void)printf("\r\n"); 1336 (void)fflush(stdout); 1337 if (debug) { 1338 syslog(LOG_DEBUG, "<--- %d- ", n); 1339 vsyslog(LOG_DEBUG, fmt, ap); 1340 } 1341 } 1342 1343 static void 1344 ack(s) 1345 char *s; 1346 { 1347 1348 reply(250, "%s command successful.", s); 1349 } 1350 1351 void 1352 nack(s) 1353 char *s; 1354 { 1355 1356 reply(502, "%s command not implemented.", s); 1357 } 1358 1359 /* ARGSUSED */ 1360 void 1361 yyerror(s) 1362 char *s; 1363 { 1364 char *cp; 1365 1366 if ((cp = strchr(cbuf,'\n')) != NULL) 1367 *cp = '\0'; 1368 reply(500, "'%s': command not understood.", cbuf); 1369 } 1370 1371 void 1372 delete(name) 1373 char *name; 1374 { 1375 struct stat st; 1376 1377 LOGCMD("delete", name); 1378 if (stat(name, &st) < 0) { 1379 perror_reply(550, name); 1380 return; 1381 } 1382 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1383 if (rmdir(name) < 0) { 1384 perror_reply(550, name); 1385 return; 1386 } 1387 goto done; 1388 } 1389 if (unlink(name) < 0) { 1390 perror_reply(550, name); 1391 return; 1392 } 1393 done: 1394 ack("DELE"); 1395 } 1396 1397 void 1398 cwd(path) 1399 char *path; 1400 { 1401 1402 if (chdir(path) < 0) 1403 perror_reply(550, path); 1404 else { 1405 show_chdir_messages(250); 1406 ack("CWD"); 1407 } 1408 } 1409 1410 void 1411 makedir(name) 1412 char *name; 1413 { 1414 1415 LOGCMD("mkdir", name); 1416 if (mkdir(name, 0777) < 0) 1417 perror_reply(550, name); 1418 else 1419 reply(257, "MKD command successful."); 1420 } 1421 1422 void 1423 removedir(name) 1424 char *name; 1425 { 1426 1427 LOGCMD("rmdir", name); 1428 if (rmdir(name) < 0) 1429 perror_reply(550, name); 1430 else 1431 ack("RMD"); 1432 } 1433 1434 void 1435 pwd() 1436 { 1437 char path[MAXPATHLEN + 1]; 1438 1439 if (getwd(path) == (char *)NULL) 1440 reply(550, "%s.", path); 1441 else 1442 reply(257, "\"%s\" is current directory.", path); 1443 } 1444 1445 char * 1446 renamefrom(name) 1447 char *name; 1448 { 1449 struct stat st; 1450 1451 if (stat(name, &st) < 0) { 1452 perror_reply(550, name); 1453 return ((char *)0); 1454 } 1455 reply(350, "File exists, ready for destination name"); 1456 return (name); 1457 } 1458 1459 void 1460 renamecmd(from, to) 1461 char *from, *to; 1462 { 1463 1464 LOGCMD2("rename", from, to); 1465 if (rename(from, to) < 0) 1466 perror_reply(550, "rename"); 1467 else 1468 ack("RNTO"); 1469 } 1470 1471 static void 1472 dolog(sin) 1473 struct sockaddr_in *sin; 1474 { 1475 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1476 sizeof(struct in_addr), AF_INET); 1477 1478 if (hp) 1479 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1480 else 1481 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1482 sizeof(remotehost)); 1483 #ifdef HASSETPROCTITLE 1484 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1485 setproctitle(proctitle); 1486 #endif /* HASSETPROCTITLE */ 1487 1488 if (logging) 1489 syslog(LOG_INFO, "connection from %s", remotehost); 1490 } 1491 1492 /* 1493 * Record logout in wtmp file 1494 * and exit with supplied status. 1495 */ 1496 void 1497 dologout(status) 1498 int status; 1499 { 1500 /* 1501 * Prevent reception of SIGURG from resulting in a resumption 1502 * back to the main program loop. 1503 */ 1504 transflag = 0; 1505 1506 if (logged_in) { 1507 (void) seteuid((uid_t)0); 1508 logwtmp(ttyline, "", ""); 1509 #if defined(KERBEROS) 1510 if (!notickets && krbtkfile_env) 1511 unlink(krbtkfile_env); 1512 #endif 1513 } 1514 /* beware of flushing buffers after a SIGPIPE */ 1515 _exit(status); 1516 } 1517 1518 static void 1519 myoob(signo) 1520 int signo; 1521 { 1522 char *cp; 1523 1524 /* only process if transfer occurring */ 1525 if (!transflag) 1526 return; 1527 cp = tmpline; 1528 if (getline(cp, 7, stdin) == NULL) { 1529 reply(221, "You could at least say goodbye."); 1530 dologout(0); 1531 } 1532 upper(cp); 1533 if (strcmp(cp, "ABOR\r\n") == 0) { 1534 tmpline[0] = '\0'; 1535 reply(426, "Transfer aborted. Data connection closed."); 1536 reply(226, "Abort successful"); 1537 longjmp(urgcatch, 1); 1538 } 1539 if (strcmp(cp, "STAT\r\n") == 0) { 1540 if (file_size != (off_t) -1) 1541 reply(213, "Status: %qd of %qd bytes transferred", 1542 byte_count, file_size); 1543 else 1544 reply(213, "Status: %qd bytes transferred", byte_count); 1545 } 1546 } 1547 1548 /* 1549 * Note: a response of 425 is not mentioned as a possible response to 1550 * the PASV command in RFC959. However, it has been blessed as 1551 * a legitimate response by Jon Postel in a telephone conversation 1552 * with Rick Adams on 25 Jan 89. 1553 */ 1554 void 1555 passive() 1556 { 1557 int len; 1558 char *p, *a; 1559 1560 pdata = socket(AF_INET, SOCK_STREAM, 0); 1561 if (pdata < 0 || !logged_in) { 1562 perror_reply(425, "Can't open passive connection"); 1563 return; 1564 } 1565 pasv_addr = ctrl_addr; 1566 pasv_addr.sin_port = 0; 1567 (void) seteuid((uid_t)0); 1568 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1569 (void) seteuid((uid_t)pw->pw_uid); 1570 goto pasv_error; 1571 } 1572 (void) seteuid((uid_t)pw->pw_uid); 1573 len = sizeof(pasv_addr); 1574 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1575 goto pasv_error; 1576 if (listen(pdata, 1) < 0) 1577 goto pasv_error; 1578 a = (char *) &pasv_addr.sin_addr; 1579 p = (char *) &pasv_addr.sin_port; 1580 1581 #define UC(b) (((int) b) & 0xff) 1582 1583 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1584 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1585 return; 1586 1587 pasv_error: 1588 (void) close(pdata); 1589 pdata = -1; 1590 perror_reply(425, "Can't open passive connection"); 1591 return; 1592 } 1593 1594 /* 1595 * Generate unique name for file with basename "local". 1596 * The file named "local" is already known to exist. 1597 * Generates failure reply on error. 1598 * 1599 * XXX this function should under go changes similar to 1600 * the mktemp(3)/mkstemp(3) changes. 1601 */ 1602 static char * 1603 gunique(local) 1604 char *local; 1605 { 1606 static char new[MAXPATHLEN]; 1607 struct stat st; 1608 int count, len; 1609 char *cp; 1610 1611 cp = strrchr(local, '/'); 1612 if (cp) 1613 *cp = '\0'; 1614 if (stat(cp ? local : ".", &st) < 0) { 1615 perror_reply(553, cp ? local : "."); 1616 return ((char *) 0); 1617 } 1618 if (cp) 1619 *cp = '/'; 1620 (void) strcpy(new, local); 1621 len = strlen(new); 1622 cp = new + len; 1623 *cp++ = '.'; 1624 for (count = 1; count < 100; count++) { 1625 (void)snprintf(cp, sizeof(new) - len - 2, "%d", count); 1626 if (stat(new, &st) < 0) 1627 return (new); 1628 } 1629 reply(452, "Unique file name cannot be created."); 1630 return (NULL); 1631 } 1632 1633 /* 1634 * Format and send reply containing system error number. 1635 */ 1636 void 1637 perror_reply(code, string) 1638 int code; 1639 char *string; 1640 { 1641 1642 reply(code, "%s: %s.", string, strerror(errno)); 1643 } 1644 1645 static char *onefile[] = { 1646 "", 1647 0 1648 }; 1649 1650 void 1651 send_file_list(whichf) 1652 char *whichf; 1653 { 1654 struct stat st; 1655 DIR *dirp = NULL; 1656 struct dirent *dir; 1657 FILE *dout = NULL; 1658 char **dirlist, *dirname; 1659 int simple = 0; 1660 int freeglob = 0; 1661 glob_t gl; 1662 #ifdef __GNUC__ 1663 (void) &dout; 1664 (void) &dirlist; 1665 (void) &simple; 1666 (void) &freeglob; 1667 #endif 1668 1669 if (strpbrk(whichf, "~{[*?") != NULL) { 1670 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1671 1672 memset(&gl, 0, sizeof(gl)); 1673 freeglob = 1; 1674 if (glob(whichf, flags, 0, &gl)) { 1675 reply(550, "not found"); 1676 goto out; 1677 } else if (gl.gl_pathc == 0) { 1678 errno = ENOENT; 1679 perror_reply(550, whichf); 1680 goto out; 1681 } 1682 dirlist = gl.gl_pathv; 1683 } else { 1684 onefile[0] = whichf; 1685 dirlist = onefile; 1686 simple = 1; 1687 } 1688 1689 if (setjmp(urgcatch)) { 1690 transflag = 0; 1691 goto out; 1692 } 1693 while ((dirname = *dirlist++) != NULL) { 1694 if (stat(dirname, &st) < 0) { 1695 /* 1696 * If user typed "ls -l", etc, and the client 1697 * used NLST, do what the user meant. 1698 */ 1699 if (dirname[0] == '-' && *dirlist == NULL && 1700 transflag == 0) { 1701 retrieve("/bin/ls %s", dirname); 1702 goto out; 1703 } 1704 perror_reply(550, whichf); 1705 if (dout != NULL) { 1706 (void) fclose(dout); 1707 transflag = 0; 1708 data = -1; 1709 pdata = -1; 1710 } 1711 goto out; 1712 } 1713 1714 if (S_ISREG(st.st_mode)) { 1715 if (dout == NULL) { 1716 dout = dataconn("file list", (off_t)-1, "w"); 1717 if (dout == NULL) 1718 goto out; 1719 transflag++; 1720 } 1721 fprintf(dout, "%s%s\n", dirname, 1722 type == TYPE_A ? "\r" : ""); 1723 byte_count += strlen(dirname) + 1; 1724 continue; 1725 } else if (!S_ISDIR(st.st_mode)) 1726 continue; 1727 1728 if ((dirp = opendir(dirname)) == NULL) 1729 continue; 1730 1731 while ((dir = readdir(dirp)) != NULL) { 1732 char nbuf[MAXPATHLEN]; 1733 1734 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1735 continue; 1736 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1737 dir->d_namlen == 2) 1738 continue; 1739 1740 (void)snprintf(nbuf, sizeof nbuf, "%s/%s", dirname, 1741 dir->d_name); 1742 1743 /* 1744 * We have to do a stat to insure it's 1745 * not a directory or special file. 1746 */ 1747 if (simple || (stat(nbuf, &st) == 0 && 1748 S_ISREG(st.st_mode))) { 1749 if (dout == NULL) { 1750 dout = dataconn("file list", (off_t)-1, 1751 "w"); 1752 if (dout == NULL) 1753 goto out; 1754 transflag++; 1755 } 1756 if (nbuf[0] == '.' && nbuf[1] == '/') 1757 fprintf(dout, "%s%s\n", &nbuf[2], 1758 type == TYPE_A ? "\r" : ""); 1759 else 1760 fprintf(dout, "%s%s\n", nbuf, 1761 type == TYPE_A ? "\r" : ""); 1762 byte_count += strlen(nbuf) + 1; 1763 } 1764 } 1765 (void) closedir(dirp); 1766 } 1767 1768 if (dout == NULL) 1769 reply(550, "No files found."); 1770 else if (ferror(dout) != 0) 1771 perror_reply(550, "Data connection"); 1772 else 1773 reply(226, "Transfer complete."); 1774 1775 transflag = 0; 1776 if (dout != NULL) 1777 (void) fclose(dout); 1778 data = -1; 1779 pdata = -1; 1780 out: 1781 if (freeglob) { 1782 freeglob = 0; 1783 globfree(&gl); 1784 } 1785 } 1786
Indexes created Mon Sep 22 13:09:51 GMT 2025