ftpd.c revision 1.25
1 /* $NetBSD: ftpd.c,v 1.25 1997/06/18 19:05:50 christos 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 1.25 1997/06/18 19:05:50 christos 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 static char * 197 curdir() 198 { 199 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 200 201 if (getcwd(path, sizeof(path)-2) == NULL) 202 return (""); 203 if (path[1] != '\0') /* special case for root dir. */ 204 strcat(path, "/"); 205 /* For guest account, skip / since it's chrooted */ 206 return (guest ? path+1 : path); 207 } 208 209 int 210 main(argc, argv, envp) 211 int argc; 212 char *argv[]; 213 char **envp; 214 { 215 int addrlen, ch, on = 1, tos; 216 char *cp, line[LINE_MAX]; 217 FILE *fd; 218 219 /* 220 * LOG_NDELAY sets up the logging connection immediately, 221 * necessary for anonymous ftp's that chroot and can't do it later. 222 */ 223 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 224 addrlen = sizeof(his_addr); 225 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 226 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 227 exit(1); 228 } 229 addrlen = sizeof(ctrl_addr); 230 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 231 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 232 exit(1); 233 } 234 #ifdef IP_TOS 235 tos = IPTOS_LOWDELAY; 236 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 237 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 238 #endif 239 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 240 debug = 0; 241 242 /* set this here so klogin can use it... */ 243 (void)sprintf(ttyline, "ftp%d", getpid()); 244 245 while ((ch = getopt(argc, argv, "a:dlt:T:u:v")) != EOF) { 246 switch (ch) { 247 case 'a': 248 anondir = optarg; 249 break; 250 251 case 'd': 252 case 'v': /* deprecated */ 253 debug = 1; 254 break; 255 256 case 'l': 257 logging++; /* > 1 == extra logging */ 258 break; 259 260 case 't': 261 case 'T': 262 case 'u': 263 warnx("-%c has be deprecated in favour of ftpd.conf", 264 ch); 265 break; 266 267 default: 268 warnx("unknown flag -%c ignored", optopt); 269 break; 270 } 271 } 272 (void) freopen(_PATH_DEVNULL, "w", stderr); 273 (void) signal(SIGPIPE, lostconn); 274 (void) signal(SIGCHLD, SIG_IGN); 275 if ((long)signal(SIGURG, myoob) < 0) 276 syslog(LOG_ERR, "signal: %m"); 277 278 /* Try to handle urgent data inline */ 279 #ifdef SO_OOBINLINE 280 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 281 syslog(LOG_ERR, "setsockopt: %m"); 282 #endif 283 284 #ifdef F_SETOWN 285 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 286 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 287 #endif 288 dolog(&his_addr); 289 /* 290 * Set up default state 291 */ 292 data = -1; 293 type = TYPE_A; 294 form = FORM_N; 295 stru = STRU_F; 296 mode = MODE_S; 297 tmpline[0] = '\0'; 298 299 /* If logins are disabled, print out the message. */ 300 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 301 while (fgets(line, sizeof(line), fd) != NULL) { 302 if ((cp = strchr(line, '\n')) != NULL) 303 *cp = '\0'; 304 lreply(530, "%s", line); 305 } 306 (void) fflush(stdout); 307 (void) fclose(fd); 308 reply(530, "System not available."); 309 exit(0); 310 } 311 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 312 while (fgets(line, sizeof(line), fd) != NULL) { 313 if ((cp = strchr(line, '\n')) != NULL) 314 *cp = '\0'; 315 lreply(220, "%s", line); 316 } 317 (void) fflush(stdout); 318 (void) fclose(fd); 319 /* reply(220,) must follow */ 320 } 321 (void) gethostname(hostname, sizeof(hostname)); 322 reply(220, "%s FTP server (%s) ready.", hostname, version); 323 (void) setjmp(errcatch); 324 for (;;) 325 (void) yyparse(); 326 /* NOTREACHED */ 327 } 328 329 static void 330 lostconn(signo) 331 int signo; 332 { 333 334 if (debug) 335 syslog(LOG_DEBUG, "lost connection"); 336 dologout(-1); 337 } 338 339 /* 340 * Helper function for sgetpwnam(). 341 */ 342 static char * 343 sgetsave(s) 344 char *s; 345 { 346 char *new = malloc((unsigned) strlen(s) + 1); 347 348 if (new == NULL) { 349 perror_reply(421, "Local resource failure: malloc"); 350 dologout(1); 351 /* NOTREACHED */ 352 } 353 (void) strcpy(new, s); 354 return (new); 355 } 356 357 /* 358 * Save the result of a getpwnam. Used for USER command, since 359 * the data returned must not be clobbered by any other command 360 * (e.g., globbing). 361 */ 362 static struct passwd * 363 sgetpwnam(name) 364 char *name; 365 { 366 static struct passwd save; 367 struct passwd *p; 368 369 if ((p = getpwnam(name)) == NULL) 370 return (p); 371 if (save.pw_name) { 372 free(save.pw_name); 373 free(save.pw_passwd); 374 free(save.pw_gecos); 375 free(save.pw_dir); 376 free(save.pw_shell); 377 } 378 save = *p; 379 save.pw_name = sgetsave(p->pw_name); 380 save.pw_passwd = sgetsave(p->pw_passwd); 381 save.pw_gecos = sgetsave(p->pw_gecos); 382 save.pw_dir = sgetsave(p->pw_dir); 383 save.pw_shell = sgetsave(p->pw_shell); 384 return (&save); 385 } 386 387 static int login_attempts; /* number of failed login attempts */ 388 static int askpasswd; /* had user command, ask for passwd */ 389 static char curname[10]; /* current USER name */ 390 391 /* 392 * USER command. 393 * Sets global passwd pointer pw if named account exists and is acceptable; 394 * sets askpasswd if a PASS command is expected. If logged in previously, 395 * need to reset state. If name is "ftp" or "anonymous", the name is not in 396 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 397 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 398 * requesting login privileges. Disallow anyone who does not have a standard 399 * shell as returned by getusershell(). Disallow anyone mentioned in the file 400 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 401 */ 402 void 403 user(name) 404 char *name; 405 { 406 if (logged_in) { 407 if (guest) { 408 reply(530, "Can't change user from guest login."); 409 return; 410 } else if (dochroot) { 411 reply(530, "Can't change user from chroot user."); 412 return; 413 } 414 end_login(); 415 } 416 417 guest = 0; 418 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 419 if (checkaccess("ftp") || checkaccess("anonymous")) 420 reply(530, "User %s access denied.", name); 421 else if ((pw = sgetpwnam("ftp")) != NULL) { 422 guest = 1; 423 askpasswd = 1; 424 reply(331, 425 "Guest login ok, type your name as password."); 426 } else 427 reply(530, "User %s unknown.", name); 428 if (!askpasswd && logging) 429 syslog(LOG_NOTICE, 430 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 431 return; 432 } 433 pw = sgetpwnam(name); 434 if (logging) 435 strncpy(curname, name, sizeof(curname)-1); 436 #ifdef SKEY 437 if (!skey_haskey(name)) { 438 char *myskey, *skey_keyinfo __P((char *name)); 439 440 myskey = skey_keyinfo(name); 441 reply(331, "Password [%s] for %s required.", 442 myskey ? myskey : "error getting challenge", name); 443 } else 444 #endif 445 reply(331, "Password required for %s.", name); 446 447 askpasswd = 1; 448 /* 449 * Delay before reading passwd after first failed 450 * attempt to slow down passwd-guessing programs. 451 */ 452 if (login_attempts) 453 sleep((unsigned) login_attempts); 454 } 455 456 /* 457 * Check if a user is in the file "fname" 458 */ 459 static int 460 checkuser(fname, name) 461 char *fname; 462 char *name; 463 { 464 FILE *fd; 465 int found = 0; 466 char *p, line[BUFSIZ]; 467 468 if ((fd = fopen(fname, "r")) != NULL) { 469 while (fgets(line, sizeof(line), fd) != NULL) 470 if ((p = strchr(line, '\n')) != NULL) { 471 *p = '\0'; 472 if (line[0] == '#') 473 continue; 474 if (strcmp(line, name) == 0) { 475 found = 1; 476 break; 477 } 478 } 479 (void) fclose(fd); 480 } 481 return (found); 482 } 483 484 /* 485 * Determine whether a user has access, based on information in 486 * _PATH_FTPUSERS. Each line is a shell-style glob followed by 487 * `allow' or `deny' (with deny being the default if anything but 488 * `allow', or nothing at all, is specified). 489 * 490 * Each glob is matched against the username in turn, and the first 491 * match found is used. If no match is found, access is allowed. 492 * 493 * Any line starting with `#' is considered a comment and ignored. 494 * 495 * This is probably not the best way to do this, but it preserves 496 * the old semantics where if a user was listed in the file he was 497 * denied, otherwise he was allowed. 498 * 499 * There is one change in the semantics, however; ftpd will now `fail 500 * safe' and deny all access if there's no /etc/ftpusers file. 501 * 502 * Return 1 if the user is denied, or 0 if he is allowed. 503 */ 504 static int 505 checkaccess(name) 506 char *name; 507 { 508 #define ALLOWED 0 509 #define NOT_ALLOWED 1 510 FILE *fd; 511 int retval = ALLOWED; 512 char *glob, *perm, line[BUFSIZ]; 513 514 if ((fd = fopen(_PATH_FTPUSERS, "r")) == NULL) 515 return NOT_ALLOWED; 516 517 while (fgets(line, sizeof(line), fd) != NULL) { 518 glob = strtok(line, " \t\n"); 519 if (glob[0] == '#') 520 continue; 521 perm = strtok(NULL, " \t\n"); 522 if (fnmatch(glob, name, 0) == 0) { 523 if (perm != NULL && strcmp(perm, "allow") == 0) 524 retval = ALLOWED; 525 else 526 retval = NOT_ALLOWED; 527 break; 528 } 529 } 530 (void) fclose(fd); 531 return (retval); 532 533 } 534 #undef ALLOWED 535 #undef NOT_ALLOWED 536 537 /* 538 * Terminate login as previous user, if any, resetting state; 539 * used when USER command is given or login fails. 540 */ 541 static void 542 end_login() 543 { 544 545 (void) seteuid((uid_t)0); 546 if (logged_in) 547 logwtmp(ttyline, "", ""); 548 pw = NULL; 549 logged_in = 0; 550 guest = 0; 551 dochroot = 0; 552 } 553 554 void 555 pass(passwd) 556 char *passwd; 557 { 558 int rval; 559 FILE *fd; 560 char *cp, *shell; 561 562 if (logged_in || askpasswd == 0) { 563 reply(503, "Login with USER first."); 564 return; 565 } 566 askpasswd = 0; 567 if (!guest) { /* "ftp" is only account allowed no password */ 568 if (pw == NULL) { 569 rval = 1; /* failure below */ 570 goto skip; 571 } 572 #if defined(KERBEROS) 573 rval = klogin(pw, "", hostname, passwd); 574 if (rval == 0) 575 goto skip; 576 #endif 577 #ifdef SKEY 578 if (skey_haskey(pw->pw_name) == 0 && 579 (skey_passcheck(pw->pw_name, passwd) != -1)) { 580 rval = 0; 581 goto skip; 582 } 583 #endif 584 /* the strcmp does not catch null passwords! */ 585 if (pw == NULL || *pw->pw_passwd == '\0' || 586 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 587 rval = 1; /* failure */ 588 goto skip; 589 } 590 rval = 0; 591 592 skip: 593 /* 594 * If rval == 1, the user failed the authentication check 595 * above. If rval == 0, either Kerberos or local authentication 596 * succeeded. 597 */ 598 if (rval) { 599 reply(530, "Login incorrect."); 600 if (logging) { 601 syslog(LOG_NOTICE, 602 "FTP LOGIN FAILED FROM %s", remotehost); 603 syslog(LOG_AUTHPRIV | LOG_NOTICE, 604 "FTP LOGIN FAILED FROM %s, %s", 605 remotehost, curname); 606 } 607 pw = NULL; 608 if (login_attempts++ >= 5) { 609 syslog(LOG_NOTICE, 610 "repeated login failures from %s", 611 remotehost); 612 exit(0); 613 } 614 return; 615 } 616 } 617 618 /* password was ok; see if anything else prevents login */ 619 if (checkaccess(pw->pw_name)) { 620 reply(530, "User %s may not use FTP.", pw->pw_name); 621 if (logging) 622 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 623 remotehost, pw->pw_name); 624 pw = (struct passwd *) NULL; 625 return; 626 } 627 /* check for valid shell, if not guest user */ 628 if ((shell = pw->pw_shell) == NULL || *shell == 0) 629 shell = _PATH_BSHELL; 630 while ((cp = getusershell()) != NULL) 631 if (strcmp(cp, shell) == 0) 632 break; 633 endusershell(); 634 if (cp == NULL && guest == 0) { 635 reply(530, "User %s may not use FTP.", pw->pw_name); 636 if (logging) 637 syslog(LOG_NOTICE, 638 "FTP LOGIN REFUSED FROM %s, %s", 639 remotehost, pw->pw_name); 640 pw = (struct passwd *) NULL; 641 return; 642 } 643 644 login_attempts = 0; /* this time successful */ 645 if (setegid((gid_t)pw->pw_gid) < 0) { 646 reply(550, "Can't set gid."); 647 return; 648 } 649 (void) initgroups(pw->pw_name, pw->pw_gid); 650 651 /* open wtmp before chroot */ 652 logwtmp(ttyline, pw->pw_name, remotehost); 653 logged_in = 1; 654 655 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 656 657 /* parse ftpd.conf, setting up various parameters */ 658 if (guest) 659 parse_conf(CLASS_GUEST); 660 else if (dochroot) 661 parse_conf(CLASS_CHROOT); 662 else 663 parse_conf(CLASS_REAL); 664 665 if (guest) { 666 /* 667 * We MUST do a chdir() after the chroot. Otherwise 668 * the old current directory will be accessible as "." 669 * outside the new root! 670 */ 671 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 672 chdir("/") < 0) { 673 reply(550, "Can't set guest privileges."); 674 goto bad; 675 } 676 } else if (dochroot) { 677 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 678 reply(550, "Can't change root."); 679 goto bad; 680 } 681 } else if (chdir(pw->pw_dir) < 0) { 682 if (chdir("/") < 0) { 683 reply(530, "User %s: can't change directory to %s.", 684 pw->pw_name, pw->pw_dir); 685 goto bad; 686 } else 687 lreply(230, "No directory! Logging in with home=/"); 688 } 689 if (seteuid((uid_t)pw->pw_uid) < 0) { 690 reply(550, "Can't set uid."); 691 goto bad; 692 } 693 /* 694 * Display a login message, if it exists. 695 * N.B. reply(230,) must follow the message. 696 */ 697 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 698 char *cp, line[LINE_MAX]; 699 700 while (fgets(line, sizeof(line), fd) != NULL) { 701 if ((cp = strchr(line, '\n')) != NULL) 702 *cp = '\0'; 703 lreply(230, "%s", line); 704 } 705 (void) fflush(stdout); 706 (void) fclose(fd); 707 } 708 show_chdir_messages(230); 709 if (guest) { 710 reply(230, "Guest login ok, access restrictions apply."); 711 #ifdef HASSETPROCTITLE 712 snprintf(proctitle, sizeof(proctitle), 713 "%s: anonymous/%.*s", remotehost, 714 (int) (sizeof(proctitle) - sizeof(remotehost) - 715 sizeof(": anonymous/")), passwd); 716 setproctitle(proctitle); 717 #endif /* HASSETPROCTITLE */ 718 if (logging) 719 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 720 remotehost, passwd); 721 } else { 722 reply(230, "User %s logged in.", pw->pw_name); 723 #ifdef HASSETPROCTITLE 724 snprintf(proctitle, sizeof(proctitle), 725 "%s: %s", remotehost, pw->pw_name); 726 setproctitle(proctitle); 727 #endif /* HASSETPROCTITLE */ 728 if (logging) 729 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 730 remotehost, pw->pw_name); 731 } 732 (void) umask(curclass.umask); 733 return; 734 bad: 735 /* Forget all about it... */ 736 end_login(); 737 } 738 739 void 740 retrieve(cmd, name) 741 char *cmd, *name; 742 { 743 FILE *fin, *dout; 744 struct stat st; 745 int (*closefunc) __P((FILE *)); 746 int log; 747 748 log = (cmd == 0); 749 if (cmd == 0) { 750 fin = fopen(name, "r"), closefunc = fclose; 751 if (fin == NULL) 752 cmd = do_conversion(name); 753 } 754 if (cmd) { 755 char line[BUFSIZ]; 756 757 (void) sprintf(line, cmd, name), name = line; 758 fin = ftpd_popen(line, "r", 1), closefunc = ftpd_pclose; 759 st.st_size = -1; 760 st.st_blksize = BUFSIZ; 761 } 762 if (fin == NULL) { 763 if (errno != 0) { 764 perror_reply(550, name); 765 if (log) { 766 LOGCMD("get", name); 767 } 768 } 769 return; 770 } 771 byte_count = -1; 772 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 773 reply(550, "%s: not a plain file.", name); 774 goto done; 775 } 776 if (restart_point) { 777 if (type == TYPE_A) { 778 off_t i, n; 779 int c; 780 781 n = restart_point; 782 i = 0; 783 while (i++ < n) { 784 if ((c=getc(fin)) == EOF) { 785 perror_reply(550, name); 786 goto done; 787 } 788 if (c == '\n') 789 i++; 790 } 791 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 792 perror_reply(550, name); 793 goto done; 794 } 795 } 796 dout = dataconn(name, st.st_size, "w"); 797 if (dout == NULL) 798 goto done; 799 send_data(fin, dout, st.st_blksize); 800 (void) fclose(dout); 801 data = -1; 802 pdata = -1; 803 done: 804 if (log) 805 LOGBYTES("get", name, byte_count); 806 (*closefunc)(fin); 807 } 808 809 void 810 store(name, mode, unique) 811 char *name, *mode; 812 int unique; 813 { 814 FILE *fout, *din; 815 struct stat st; 816 int (*closefunc) __P((FILE *)); 817 818 if (unique && stat(name, &st) == 0 && 819 (name = gunique(name)) == NULL) { 820 LOGCMD(*mode == 'w' ? "put" : "append", name); 821 return; 822 } 823 824 if (restart_point) 825 mode = "r+"; 826 fout = fopen(name, mode); 827 closefunc = fclose; 828 if (fout == NULL) { 829 perror_reply(553, name); 830 LOGCMD(*mode == 'w' ? "put" : "append", name); 831 return; 832 } 833 byte_count = -1; 834 if (restart_point) { 835 if (type == TYPE_A) { 836 off_t i, n; 837 int c; 838 839 n = restart_point; 840 i = 0; 841 while (i++ < n) { 842 if ((c=getc(fout)) == EOF) { 843 perror_reply(550, name); 844 goto done; 845 } 846 if (c == '\n') 847 i++; 848 } 849 /* 850 * We must do this seek to "current" position 851 * because we are changing from reading to 852 * writing. 853 */ 854 if (fseek(fout, 0L, SEEK_CUR) < 0) { 855 perror_reply(550, name); 856 goto done; 857 } 858 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 859 perror_reply(550, name); 860 goto done; 861 } 862 } 863 din = dataconn(name, (off_t)-1, "r"); 864 if (din == NULL) 865 goto done; 866 if (receive_data(din, fout) == 0) { 867 if (unique) 868 reply(226, "Transfer complete (unique file name:%s).", 869 name); 870 else 871 reply(226, "Transfer complete."); 872 } 873 (void) fclose(din); 874 data = -1; 875 pdata = -1; 876 done: 877 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 878 (*closefunc)(fout); 879 } 880 881 static FILE * 882 getdatasock(mode) 883 char *mode; 884 { 885 int on = 1, s, t, tries; 886 887 if (data >= 0) 888 return (fdopen(data, mode)); 889 (void) seteuid((uid_t)0); 890 s = socket(AF_INET, SOCK_STREAM, 0); 891 if (s < 0) 892 goto bad; 893 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 894 (char *) &on, sizeof(on)) < 0) 895 goto bad; 896 /* anchor socket to avoid multi-homing problems */ 897 data_source.sin_len = sizeof(struct sockaddr_in); 898 data_source.sin_family = AF_INET; 899 data_source.sin_addr = ctrl_addr.sin_addr; 900 for (tries = 1; ; tries++) { 901 if (bind(s, (struct sockaddr *)&data_source, 902 sizeof(data_source)) >= 0) 903 break; 904 if (errno != EADDRINUSE || tries > 10) 905 goto bad; 906 sleep(tries); 907 } 908 (void) seteuid((uid_t)pw->pw_uid); 909 #ifdef IP_TOS 910 on = IPTOS_THROUGHPUT; 911 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 912 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 913 #endif 914 return (fdopen(s, mode)); 915 bad: 916 /* Return the real value of errno (close may change it) */ 917 t = errno; 918 (void) seteuid((uid_t)pw->pw_uid); 919 (void) close(s); 920 errno = t; 921 return (NULL); 922 } 923 924 static FILE * 925 dataconn(name, size, mode) 926 char *name; 927 off_t size; 928 char *mode; 929 { 930 char sizebuf[32]; 931 FILE *file; 932 int retry = 0, tos; 933 934 file_size = size; 935 byte_count = 0; 936 if (size != (off_t) -1) 937 (void) sprintf(sizebuf, " (%qd bytes)", size); 938 else 939 (void) strcpy(sizebuf, ""); 940 if (pdata >= 0) { 941 struct sockaddr_in from; 942 int s, fromlen = sizeof(from); 943 944 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 945 if (s < 0) { 946 reply(425, "Can't open data connection."); 947 (void) close(pdata); 948 pdata = -1; 949 return (NULL); 950 } 951 (void) close(pdata); 952 pdata = s; 953 #ifdef IP_TOS 954 tos = IPTOS_THROUGHPUT; 955 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 956 sizeof(int)); 957 #endif 958 reply(150, "Opening %s mode data connection for '%s'%s.", 959 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 960 return (fdopen(pdata, mode)); 961 } 962 if (data >= 0) { 963 reply(125, "Using existing data connection for '%s'%s.", 964 name, sizebuf); 965 usedefault = 1; 966 return (fdopen(data, mode)); 967 } 968 if (usedefault) 969 data_dest = his_addr; 970 usedefault = 1; 971 file = getdatasock(mode); 972 if (file == NULL) { 973 reply(425, "Can't create data socket (%s,%d): %s.", 974 inet_ntoa(data_source.sin_addr), 975 ntohs(data_source.sin_port), strerror(errno)); 976 return (NULL); 977 } 978 data = fileno(file); 979 while (connect(data, (struct sockaddr *)&data_dest, 980 sizeof(data_dest)) < 0) { 981 if (errno == EADDRINUSE && retry < swaitmax) { 982 sleep((unsigned) swaitint); 983 retry += swaitint; 984 continue; 985 } 986 perror_reply(425, "Can't build data connection"); 987 (void) fclose(file); 988 data = -1; 989 return (NULL); 990 } 991 reply(150, "Opening %s mode data connection for '%s'%s.", 992 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 993 return (file); 994 } 995 996 /* 997 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 998 * encapsulation of the data subject * to Mode, Structure, and Type. 999 * 1000 * NB: Form isn't handled. 1001 */ 1002 static void 1003 send_data(instr, outstr, blksize) 1004 FILE *instr, *outstr; 1005 off_t blksize; 1006 { 1007 int c, cnt, filefd, netfd; 1008 char *buf; 1009 1010 transflag++; 1011 if (setjmp(urgcatch)) { 1012 transflag = 0; 1013 return; 1014 } 1015 1016 switch (type) { 1017 1018 case TYPE_A: 1019 while ((c = getc(instr)) != EOF) { 1020 byte_count++; 1021 if (c == '\n') { 1022 if (ferror(outstr)) 1023 goto data_err; 1024 (void) putc('\r', outstr); 1025 } 1026 (void) putc(c, outstr); 1027 } 1028 fflush(outstr); 1029 transflag = 0; 1030 if (ferror(instr)) 1031 goto file_err; 1032 if (ferror(outstr)) 1033 goto data_err; 1034 reply(226, "Transfer complete."); 1035 return; 1036 1037 case TYPE_I: 1038 case TYPE_L: 1039 if ((buf = malloc((u_int)blksize)) == NULL) { 1040 transflag = 0; 1041 perror_reply(451, "Local resource failure: malloc"); 1042 return; 1043 } 1044 netfd = fileno(outstr); 1045 filefd = fileno(instr); 1046 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1047 write(netfd, buf, cnt) == cnt) 1048 byte_count += cnt; 1049 transflag = 0; 1050 (void)free(buf); 1051 if (cnt != 0) { 1052 if (cnt < 0) 1053 goto file_err; 1054 goto data_err; 1055 } 1056 reply(226, "Transfer complete."); 1057 return; 1058 default: 1059 transflag = 0; 1060 reply(550, "Unimplemented TYPE %d in send_data", type); 1061 return; 1062 } 1063 1064 data_err: 1065 transflag = 0; 1066 perror_reply(426, "Data connection"); 1067 return; 1068 1069 file_err: 1070 transflag = 0; 1071 perror_reply(551, "Error on input file"); 1072 } 1073 1074 /* 1075 * Transfer data from peer to "outstr" using the appropriate encapulation of 1076 * the data subject to Mode, Structure, and Type. 1077 * 1078 * N.B.: Form isn't handled. 1079 */ 1080 static int 1081 receive_data(instr, outstr) 1082 FILE *instr, *outstr; 1083 { 1084 int c, cnt, bare_lfs; 1085 char buf[BUFSIZ]; 1086 #ifdef __GNUC__ 1087 (void) &bare_lfs; 1088 #endif 1089 1090 bare_lfs = 0; 1091 transflag++; 1092 if (setjmp(urgcatch)) { 1093 transflag = 0; 1094 return (-1); 1095 } 1096 1097 switch (type) { 1098 1099 case TYPE_I: 1100 case TYPE_L: 1101 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1102 if (write(fileno(outstr), buf, cnt) != cnt) 1103 goto file_err; 1104 byte_count += cnt; 1105 } 1106 if (cnt < 0) 1107 goto data_err; 1108 transflag = 0; 1109 return (0); 1110 1111 case TYPE_E: 1112 reply(553, "TYPE E not implemented."); 1113 transflag = 0; 1114 return (-1); 1115 1116 case TYPE_A: 1117 while ((c = getc(instr)) != EOF) { 1118 byte_count++; 1119 if (c == '\n') 1120 bare_lfs++; 1121 while (c == '\r') { 1122 if (ferror(outstr)) 1123 goto data_err; 1124 if ((c = getc(instr)) != '\n') { 1125 (void) putc ('\r', outstr); 1126 if (c == '\0' || c == EOF) 1127 goto contin2; 1128 } 1129 } 1130 (void) putc(c, outstr); 1131 contin2: ; 1132 } 1133 fflush(outstr); 1134 if (ferror(instr)) 1135 goto data_err; 1136 if (ferror(outstr)) 1137 goto file_err; 1138 transflag = 0; 1139 if (bare_lfs) { 1140 lreply(226, 1141 "WARNING! %d bare linefeeds received in ASCII mode", 1142 bare_lfs); 1143 (void)printf(" File may not have transferred correctly.\r\n"); 1144 } 1145 return (0); 1146 default: 1147 reply(550, "Unimplemented TYPE %d in receive_data", type); 1148 transflag = 0; 1149 return (-1); 1150 } 1151 1152 data_err: 1153 transflag = 0; 1154 perror_reply(426, "Data Connection"); 1155 return (-1); 1156 1157 file_err: 1158 transflag = 0; 1159 perror_reply(452, "Error writing file"); 1160 return (-1); 1161 } 1162 1163 void 1164 statfilecmd(filename) 1165 char *filename; 1166 { 1167 FILE *fin; 1168 int c; 1169 char line[LINE_MAX]; 1170 1171 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1172 fin = ftpd_popen(line, "r", 0); 1173 lreply(211, "status of %s:", filename); 1174 while ((c = getc(fin)) != EOF) { 1175 if (c == '\n') { 1176 if (ferror(stdout)){ 1177 perror_reply(421, "control connection"); 1178 (void) ftpd_pclose(fin); 1179 dologout(1); 1180 /* NOTREACHED */ 1181 } 1182 if (ferror(fin)) { 1183 perror_reply(551, filename); 1184 (void) ftpd_pclose(fin); 1185 return; 1186 } 1187 (void) putc('\r', stdout); 1188 } 1189 (void) putc(c, stdout); 1190 } 1191 (void) ftpd_pclose(fin); 1192 reply(211, "End of Status"); 1193 } 1194 1195 void 1196 statcmd() 1197 { 1198 struct sockaddr_in *sin; 1199 u_char *a, *p; 1200 1201 lreply(211, "%s FTP server status:", hostname); 1202 lreply(211, "%s", version); 1203 if (isdigit(remotehost[0])) 1204 lreply(211, "Connected to %s", remotehost); 1205 else 1206 lreply(211, "Connected to %s (%s)", remotehost, 1207 inet_ntoa(his_addr.sin_addr)); 1208 if (logged_in) { 1209 if (guest) 1210 lreply(211, "Logged in anonymously"); 1211 else 1212 lreply(211, "Logged in as %s", pw->pw_name); 1213 } else if (askpasswd) 1214 lreply(211, "Waiting for password"); 1215 else 1216 lreply(211, "Waiting for user name"); 1217 printf("211- TYPE: %s", typenames[type]); 1218 if (type == TYPE_A || type == TYPE_E) 1219 printf(", FORM: %s", formnames[form]); 1220 if (type == TYPE_L) 1221 #if NBBY == 8 1222 printf(" %d", NBBY); 1223 #else 1224 printf(" %d", bytesize); /* need definition! */ 1225 #endif 1226 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1227 strunames[stru], modenames[mode]); 1228 if (data != -1) 1229 lreply(211, "Data connection open"); 1230 else if (pdata != -1) { 1231 printf("211- in Passive mode"); 1232 sin = &pasv_addr; 1233 goto printaddr; 1234 } else if (usedefault == 0) { 1235 printf("211- PORT"); 1236 sin = &data_dest; 1237 printaddr: 1238 a = (u_char *) &sin->sin_addr; 1239 p = (u_char *) &sin->sin_port; 1240 #define UC(b) (((int) b) & 0xff) 1241 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1242 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1243 #undef UC 1244 } else 1245 lreply(211, "No data connection"); 1246 1247 if (logged_in) { 1248 struct ftpconv *cp; 1249 1250 lreply(211, ""); 1251 lreply(211, "Class: %s", curclass.classname); 1252 if (curclass.display) 1253 lreply(211, "Display file: %s", curclass.display); 1254 if (curclass.notify) 1255 lreply(211, "Notify fileglob: %s", curclass.notify); 1256 lreply(211, "Idle timeout: %d, maximum timeout: %d", 1257 curclass.timeout, curclass.maxtimeout); 1258 lreply(211, "dele, mkd, rmd, umask, chmod: %sabled", 1259 curclass.modify ? "en" : "dis"); 1260 lreply(211, "Umask: %.04o", curclass.umask); 1261 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1262 if (cp->suffix == NULL || cp->types == NULL || 1263 cp->command == NULL) 1264 continue; 1265 lreply(211, 1266 "Conversion: %s [%s] disable: %s, command: %s", 1267 cp->suffix, cp->types, cp->disable, cp->command); 1268 } 1269 } 1270 1271 reply(211, "End of status"); 1272 } 1273 1274 void 1275 fatal(s) 1276 char *s; 1277 { 1278 1279 reply(451, "Error in server: %s\n", s); 1280 reply(221, "Closing connection due to server error."); 1281 dologout(0); 1282 /* NOTREACHED */ 1283 } 1284 1285 void 1286 #if __STDC__ 1287 reply(int n, const char *fmt, ...) 1288 #else 1289 reply(n, fmt, va_alist) 1290 int n; 1291 char *fmt; 1292 va_dcl 1293 #endif 1294 { 1295 va_list ap; 1296 #if __STDC__ 1297 va_start(ap, fmt); 1298 #else 1299 va_start(ap); 1300 #endif 1301 (void)printf("%d ", n); 1302 (void)vprintf(fmt, ap); 1303 (void)printf("\r\n"); 1304 (void)fflush(stdout); 1305 if (debug) { 1306 syslog(LOG_DEBUG, "<--- %d ", n); 1307 vsyslog(LOG_DEBUG, fmt, ap); 1308 } 1309 } 1310 1311 void 1312 #if __STDC__ 1313 lreply(int n, const char *fmt, ...) 1314 #else 1315 lreply(n, fmt, va_alist) 1316 int n; 1317 char *fmt; 1318 va_dcl 1319 #endif 1320 { 1321 va_list ap; 1322 #if __STDC__ 1323 va_start(ap, fmt); 1324 #else 1325 va_start(ap); 1326 #endif 1327 (void)printf("%d- ", n); 1328 (void)vprintf(fmt, ap); 1329 (void)printf("\r\n"); 1330 (void)fflush(stdout); 1331 if (debug) { 1332 syslog(LOG_DEBUG, "<--- %d- ", n); 1333 vsyslog(LOG_DEBUG, fmt, ap); 1334 } 1335 } 1336 1337 static void 1338 ack(s) 1339 char *s; 1340 { 1341 1342 reply(250, "%s command successful.", s); 1343 } 1344 1345 void 1346 nack(s) 1347 char *s; 1348 { 1349 1350 reply(502, "%s command not implemented.", s); 1351 } 1352 1353 /* ARGSUSED */ 1354 void 1355 yyerror(s) 1356 char *s; 1357 { 1358 char *cp; 1359 1360 if ((cp = strchr(cbuf,'\n')) != NULL) 1361 *cp = '\0'; 1362 reply(500, "'%s': command not understood.", cbuf); 1363 } 1364 1365 void 1366 delete(name) 1367 char *name; 1368 { 1369 struct stat st; 1370 1371 LOGCMD("delete", name); 1372 if (stat(name, &st) < 0) { 1373 perror_reply(550, name); 1374 return; 1375 } 1376 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1377 if (rmdir(name) < 0) { 1378 perror_reply(550, name); 1379 return; 1380 } 1381 goto done; 1382 } 1383 if (unlink(name) < 0) { 1384 perror_reply(550, name); 1385 return; 1386 } 1387 done: 1388 ack("DELE"); 1389 } 1390 1391 void 1392 cwd(path) 1393 char *path; 1394 { 1395 1396 if (chdir(path) < 0) 1397 perror_reply(550, path); 1398 else { 1399 show_chdir_messages(250); 1400 ack("CWD"); 1401 } 1402 } 1403 1404 void 1405 makedir(name) 1406 char *name; 1407 { 1408 1409 LOGCMD("mkdir", name); 1410 if (mkdir(name, 0777) < 0) 1411 perror_reply(550, name); 1412 else 1413 reply(257, "MKD command successful."); 1414 } 1415 1416 void 1417 removedir(name) 1418 char *name; 1419 { 1420 1421 LOGCMD("rmdir", name); 1422 if (rmdir(name) < 0) 1423 perror_reply(550, name); 1424 else 1425 ack("RMD"); 1426 } 1427 1428 void 1429 pwd() 1430 { 1431 char path[MAXPATHLEN + 1]; 1432 1433 if (getwd(path) == (char *)NULL) 1434 reply(550, "%s.", path); 1435 else 1436 reply(257, "\"%s\" is current directory.", path); 1437 } 1438 1439 char * 1440 renamefrom(name) 1441 char *name; 1442 { 1443 struct stat st; 1444 1445 if (stat(name, &st) < 0) { 1446 perror_reply(550, name); 1447 return ((char *)0); 1448 } 1449 reply(350, "File exists, ready for destination name"); 1450 return (name); 1451 } 1452 1453 void 1454 renamecmd(from, to) 1455 char *from, *to; 1456 { 1457 1458 LOGCMD2("rename", from, to); 1459 if (rename(from, to) < 0) 1460 perror_reply(550, "rename"); 1461 else 1462 ack("RNTO"); 1463 } 1464 1465 static void 1466 dolog(sin) 1467 struct sockaddr_in *sin; 1468 { 1469 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1470 sizeof(struct in_addr), AF_INET); 1471 1472 if (hp) 1473 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1474 else 1475 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1476 sizeof(remotehost)); 1477 #ifdef HASSETPROCTITLE 1478 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1479 setproctitle(proctitle); 1480 #endif /* HASSETPROCTITLE */ 1481 1482 if (logging) 1483 syslog(LOG_INFO, "connection from %s", remotehost); 1484 } 1485 1486 /* 1487 * Record logout in wtmp file 1488 * and exit with supplied status. 1489 */ 1490 void 1491 dologout(status) 1492 int status; 1493 { 1494 /* 1495 * Prevent reception of SIGURG from resulting in a resumption 1496 * back to the main program loop. 1497 */ 1498 transflag = 0; 1499 1500 if (logged_in) { 1501 (void) seteuid((uid_t)0); 1502 logwtmp(ttyline, "", ""); 1503 #if defined(KERBEROS) 1504 if (!notickets && krbtkfile_env) 1505 unlink(krbtkfile_env); 1506 #endif 1507 } 1508 /* beware of flushing buffers after a SIGPIPE */ 1509 _exit(status); 1510 } 1511 1512 static void 1513 myoob(signo) 1514 int signo; 1515 { 1516 char *cp; 1517 1518 /* only process if transfer occurring */ 1519 if (!transflag) 1520 return; 1521 cp = tmpline; 1522 if (getline(cp, 7, stdin) == NULL) { 1523 reply(221, "You could at least say goodbye."); 1524 dologout(0); 1525 } 1526 upper(cp); 1527 if (strcmp(cp, "ABOR\r\n") == 0) { 1528 tmpline[0] = '\0'; 1529 reply(426, "Transfer aborted. Data connection closed."); 1530 reply(226, "Abort successful"); 1531 longjmp(urgcatch, 1); 1532 } 1533 if (strcmp(cp, "STAT\r\n") == 0) { 1534 if (file_size != (off_t) -1) 1535 reply(213, "Status: %qd of %qd bytes transferred", 1536 byte_count, file_size); 1537 else 1538 reply(213, "Status: %qd bytes transferred", byte_count); 1539 } 1540 } 1541 1542 /* 1543 * Note: a response of 425 is not mentioned as a possible response to 1544 * the PASV command in RFC959. However, it has been blessed as 1545 * a legitimate response by Jon Postel in a telephone conversation 1546 * with Rick Adams on 25 Jan 89. 1547 */ 1548 void 1549 passive() 1550 { 1551 int len; 1552 char *p, *a; 1553 1554 pdata = socket(AF_INET, SOCK_STREAM, 0); 1555 if (pdata < 0 || !logged_in) { 1556 perror_reply(425, "Can't open passive connection"); 1557 return; 1558 } 1559 pasv_addr = ctrl_addr; 1560 pasv_addr.sin_port = 0; 1561 (void) seteuid((uid_t)0); 1562 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1563 (void) seteuid((uid_t)pw->pw_uid); 1564 goto pasv_error; 1565 } 1566 (void) seteuid((uid_t)pw->pw_uid); 1567 len = sizeof(pasv_addr); 1568 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1569 goto pasv_error; 1570 if (listen(pdata, 1) < 0) 1571 goto pasv_error; 1572 a = (char *) &pasv_addr.sin_addr; 1573 p = (char *) &pasv_addr.sin_port; 1574 1575 #define UC(b) (((int) b) & 0xff) 1576 1577 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1578 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1579 return; 1580 1581 pasv_error: 1582 (void) close(pdata); 1583 pdata = -1; 1584 perror_reply(425, "Can't open passive connection"); 1585 return; 1586 } 1587 1588 /* 1589 * Generate unique name for file with basename "local". 1590 * The file named "local" is already known to exist. 1591 * Generates failure reply on error. 1592 */ 1593 static char * 1594 gunique(local) 1595 char *local; 1596 { 1597 static char new[MAXPATHLEN]; 1598 struct stat st; 1599 int count; 1600 char *cp; 1601 1602 cp = strrchr(local, '/'); 1603 if (cp) 1604 *cp = '\0'; 1605 if (stat(cp ? local : ".", &st) < 0) { 1606 perror_reply(553, cp ? local : "."); 1607 return ((char *) 0); 1608 } 1609 if (cp) 1610 *cp = '/'; 1611 (void) strcpy(new, local); 1612 cp = new + strlen(new); 1613 *cp++ = '.'; 1614 for (count = 1; count < 100; count++) { 1615 (void)sprintf(cp, "%d", count); 1616 if (stat(new, &st) < 0) 1617 return (new); 1618 } 1619 reply(452, "Unique file name cannot be created."); 1620 return (NULL); 1621 } 1622 1623 /* 1624 * Format and send reply containing system error number. 1625 */ 1626 void 1627 perror_reply(code, string) 1628 int code; 1629 char *string; 1630 { 1631 1632 reply(code, "%s: %s.", string, strerror(errno)); 1633 } 1634 1635 static char *onefile[] = { 1636 "", 1637 0 1638 }; 1639 1640 void 1641 send_file_list(whichf) 1642 char *whichf; 1643 { 1644 struct stat st; 1645 DIR *dirp = NULL; 1646 struct dirent *dir; 1647 FILE *dout = NULL; 1648 char **dirlist, *dirname; 1649 int simple = 0; 1650 int freeglob = 0; 1651 glob_t gl; 1652 #ifdef __GNUC__ 1653 (void) &dout; 1654 (void) &dirlist; 1655 (void) &simple; 1656 (void) &freeglob; 1657 #endif 1658 1659 if (strpbrk(whichf, "~{[*?") != NULL) { 1660 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1661 1662 memset(&gl, 0, sizeof(gl)); 1663 freeglob = 1; 1664 if (glob(whichf, flags, 0, &gl)) { 1665 reply(550, "not found"); 1666 goto out; 1667 } else if (gl.gl_pathc == 0) { 1668 errno = ENOENT; 1669 perror_reply(550, whichf); 1670 goto out; 1671 } 1672 dirlist = gl.gl_pathv; 1673 } else { 1674 onefile[0] = whichf; 1675 dirlist = onefile; 1676 simple = 1; 1677 } 1678 1679 if (setjmp(urgcatch)) { 1680 transflag = 0; 1681 goto out; 1682 } 1683 while ((dirname = *dirlist++) != NULL) { 1684 if (stat(dirname, &st) < 0) { 1685 /* 1686 * If user typed "ls -l", etc, and the client 1687 * used NLST, do what the user meant. 1688 */ 1689 if (dirname[0] == '-' && *dirlist == NULL && 1690 transflag == 0) { 1691 retrieve("/bin/ls %s", dirname); 1692 goto out; 1693 } 1694 perror_reply(550, whichf); 1695 if (dout != NULL) { 1696 (void) fclose(dout); 1697 transflag = 0; 1698 data = -1; 1699 pdata = -1; 1700 } 1701 goto out; 1702 } 1703 1704 if (S_ISREG(st.st_mode)) { 1705 if (dout == NULL) { 1706 dout = dataconn("file list", (off_t)-1, "w"); 1707 if (dout == NULL) 1708 goto out; 1709 transflag++; 1710 } 1711 fprintf(dout, "%s%s\n", dirname, 1712 type == TYPE_A ? "\r" : ""); 1713 byte_count += strlen(dirname) + 1; 1714 continue; 1715 } else if (!S_ISDIR(st.st_mode)) 1716 continue; 1717 1718 if ((dirp = opendir(dirname)) == NULL) 1719 continue; 1720 1721 while ((dir = readdir(dirp)) != NULL) { 1722 char nbuf[MAXPATHLEN]; 1723 1724 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1725 continue; 1726 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1727 dir->d_namlen == 2) 1728 continue; 1729 1730 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1731 1732 /* 1733 * We have to do a stat to insure it's 1734 * not a directory or special file. 1735 */ 1736 if (simple || (stat(nbuf, &st) == 0 && 1737 S_ISREG(st.st_mode))) { 1738 if (dout == NULL) { 1739 dout = dataconn("file list", (off_t)-1, 1740 "w"); 1741 if (dout == NULL) 1742 goto out; 1743 transflag++; 1744 } 1745 if (nbuf[0] == '.' && nbuf[1] == '/') 1746 fprintf(dout, "%s%s\n", &nbuf[2], 1747 type == TYPE_A ? "\r" : ""); 1748 else 1749 fprintf(dout, "%s%s\n", nbuf, 1750 type == TYPE_A ? "\r" : ""); 1751 byte_count += strlen(nbuf) + 1; 1752 } 1753 } 1754 (void) closedir(dirp); 1755 } 1756 1757 if (dout == NULL) 1758 reply(550, "No files found."); 1759 else if (ferror(dout) != 0) 1760 perror_reply(550, "Data connection"); 1761 else 1762 reply(226, "Transfer complete."); 1763 1764 transflag = 0; 1765 if (dout != NULL) 1766 (void) fclose(dout); 1767 data = -1; 1768 pdata = -1; 1769 out: 1770 if (freeglob) { 1771 freeglob = 0; 1772 globfree(&gl); 1773 } 1774 } 1775
Indexes created Fri Sep 26 20:09:58 GMT 2025