1 /* 2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: ftpd.c,v 1.15 1996/03/18 11:09:03 davidg Exp $ 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 44 #endif /* not lint */ 45 46 /* 47 * FTP server. 48 */ 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/ioctl.h> 52 #include <sys/socket.h> 53 #include <sys/wait.h> 54 #include <sys/mman.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/ip.h> 59 #include <netinet/tcp.h> 60 61 #define FTP_NAMES 62 #include <arpa/ftp.h> 63 #include <arpa/inet.h> 64 #include <arpa/telnet.h> 65 66 #include <ctype.h> 67 #include <dirent.h> 68 #include <err.h> 69 #include <errno.h> 70 #include <fcntl.h> 71 #include <glob.h> 72 #include <limits.h> 73 #include <netdb.h> 74 #include <pwd.h> 75 #include <setjmp.h> 76 #include <signal.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <syslog.h> 81 #include <time.h> 82 #include <unistd.h> 83 #include <libutil.h> 84 85 #ifdef SKEY 86 #include <skey.h> 87 #endif 88 89 #include "pathnames.h" 90 #include "extern.h" 91 92 #if __STDC__ 93 #include <stdarg.h> 94 #else 95 #include <varargs.h> 96 #endif 97 98 static char version[] = "Version 6.00"; 99 100 extern off_t restart_point; 101 extern char cbuf[]; 102 103 struct sockaddr_in server_addr; 104 struct sockaddr_in ctrl_addr; 105 struct sockaddr_in data_source; 106 struct sockaddr_in data_dest; 107 struct sockaddr_in his_addr; 108 struct sockaddr_in pasv_addr; 109 110 int daemon_mode; 111 int data; 112 jmp_buf errcatch, urgcatch; 113 int logged_in; 114 struct passwd *pw; 115 int debug; 116 int timeout = 900; /* timeout after 15 minutes of inactivity */ 117 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 118 int logging; 119 int restricted_data_ports = 1; 120 int guest; 121 #ifdef STATS 122 int stats; 123 int statfd = -1; 124 #endif 125 int type; 126 int form; 127 int stru; /* avoid C keyword */ 128 int mode; 129 int usedefault = 1; /* for data transfers */ 130 int pdata = -1; /* for passive mode */ 131 sig_atomic_t transflag; 132 off_t file_size; 133 off_t byte_count; 134 #if !defined(CMASK) || CMASK == 0 135 #undef CMASK 136 #define CMASK 027 137 #endif 138 int defumask = CMASK; /* default umask value */ 139 char tmpline[7]; 140 char hostname[MAXHOSTNAMELEN]; 141 char remotehost[MAXHOSTNAMELEN]; 142 #ifdef STATS 143 char *ident = NULL; 144 #endif 145 146 /* 147 * Timeout intervals for retrying connections 148 * to hosts that don't accept PORT cmds. This 149 * is a kludge, but given the problems with TCP... 150 */ 151 #define SWAITMAX 90 /* wait at most 90 seconds */ 152 #define SWAITINT 5 /* interval between retries */ 153 154 int swaitmax = SWAITMAX; 155 int swaitint = SWAITINT; 156 157 #ifdef SETPROCTITLE 158 #ifdef OLD_SETPROCTITLE 159 char **Argv = NULL; /* pointer to argument vector */ 160 char *LastArgv = NULL; /* end of argv */ 161 #endif /* OLD_SETPROCTITLE */ 162 char proctitle[LINE_MAX]; /* initial part of title */ 163 #endif /* SETPROCTITLE */ 164 165 #ifdef SKEY 166 int pwok = 0; 167 char addr_string[20]; /* XXX */ 168 #endif 169 170 #define LOGCMD(cmd, file) \ 171 if (logging > 1) \ 172 syslog(LOG_INFO,"%s %s%s", cmd, \ 173 *(file) == '/' ? "" : curdir(), file); 174 #define LOGCMD2(cmd, file1, file2) \ 175 if (logging > 1) \ 176 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 177 *(file1) == '/' ? "" : curdir(), file1, \ 178 *(file2) == '/' ? "" : curdir(), file2); 179 #define LOGBYTES(cmd, file, cnt) \ 180 if (logging > 1) { \ 181 if (cnt == (off_t)-1) \ 182 syslog(LOG_INFO,"%s %s%s", cmd, \ 183 *(file) == '/' ? "" : curdir(), file); \ 184 else \ 185 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 186 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 187 } 188 189 static void ack __P((char *)); 190 static void myoob __P((int)); 191 static int checkuser __P((char *)); 192 static FILE *dataconn __P((char *, off_t, char *)); 193 static void dolog __P((struct sockaddr_in *)); 194 static char *curdir __P((void)); 195 static void end_login __P((void)); 196 static FILE *getdatasock __P((char *)); 197 static char *gunique __P((char *)); 198 static void lostconn __P((int)); 199 static int receive_data __P((FILE *, FILE *)); 200 static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 201 static struct passwd * 202 sgetpwnam __P((char *)); 203 static char *sgetsave __P((char *)); 204 static void reapchild __P((int)); 205 206 static char * 207 curdir() 208 { 209 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 210 211 if (getcwd(path, sizeof(path)-2) == NULL) 212 return (""); 213 if (path[1] != '\0') /* special case for root dir. */ 214 strcat(path, "/"); 215 /* For guest account, skip / since it's chrooted */ 216 return (guest ? path+1 : path); 217 } 218 219 int 220 main(argc, argv, envp) 221 int argc; 222 char *argv[]; 223 char **envp; 224 { 225 int addrlen, ch, on = 1, tos; 226 char *cp, line[LINE_MAX]; 227 FILE *fd; 228 229 tzset(); /* in case no timezone database in ~ftp */ 230 231 #ifdef OLD_SETPROCTITLE 232 /* 233 * Save start and extent of argv for setproctitle. 234 */ 235 Argv = argv; 236 while (*envp) 237 envp++; 238 LastArgv = envp[-1] + strlen(envp[-1]); 239 #endif /* OLD_SETPROCTITLE */ 240 241 242 #ifdef STATS 243 while ((ch = getopt(argc, argv, "dlDSt:T:u:v")) != EOF) { 244 #else 245 while ((ch = getopt(argc, argv, "dlDUt:T:u:v")) != EOF) { 246 #endif 247 switch (ch) { 248 case 'D': 249 daemon_mode++; 250 break; 251 252 case 'd': 253 debug = 1; 254 break; 255 256 case 'l': 257 logging++; /* > 1 == extra logging */ 258 break; 259 260 case 'U': 261 restricted_data_ports = 0; 262 break; 263 264 case 't': 265 timeout = atoi(optarg); 266 if (maxtimeout < timeout) 267 maxtimeout = timeout; 268 break; 269 #ifdef STATS 270 case 'S': 271 stats = 1; 272 break; 273 #endif 274 case 'T': 275 maxtimeout = atoi(optarg); 276 if (timeout > maxtimeout) 277 timeout = maxtimeout; 278 break; 279 280 case 'u': 281 { 282 long val = 0; 283 284 val = strtol(optarg, &optarg, 8); 285 if (*optarg != '\0' || val < 0) 286 warnx("bad value for -u"); 287 else 288 defumask = val; 289 break; 290 } 291 292 case 'v': 293 debug = 1; 294 break; 295 296 default: 297 warnx("unknown flag -%c ignored", optopt); 298 break; 299 } 300 } 301 302 (void) freopen(_PATH_DEVNULL, "w", stderr); 303 304 /* 305 * LOG_NDELAY sets up the logging connection immediately, 306 * necessary for anonymous ftp's that chroot and can't do it later. 307 */ 308 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 309 310 if (daemon_mode) { 311 int ctl_sock, fd; 312 struct servent *sv; 313 314 /* 315 * Detach from parent. 316 */ 317 if (daemon(1, 1) < 0) { 318 syslog(LOG_ERR, "failed to become a daemon"); 319 exit(1); 320 } 321 (void) signal(SIGCHLD, reapchild); 322 /* 323 * Get port number for ftp/tcp. 324 */ 325 sv = getservbyname("ftp", "tcp"); 326 if (sv == NULL) { 327 syslog(LOG_ERR, "getservbyname for ftp failed"); 328 exit(1); 329 } 330 /* 331 * Open a socket, bind it to the FTP port, and start 332 * listening. 333 */ 334 ctl_sock = socket(AF_INET, SOCK_STREAM, 0); 335 if (ctl_sock < 0) { 336 syslog(LOG_ERR, "control socket: %m"); 337 exit(1); 338 } 339 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 340 (char *)&on, sizeof(on)) < 0) 341 syslog(LOG_ERR, "control setsockopt: %m");; 342 server_addr.sin_family = AF_INET; 343 server_addr.sin_addr.s_addr = INADDR_ANY; 344 server_addr.sin_port = sv->s_port; 345 if (bind(ctl_sock, (struct sockaddr *)&server_addr, sizeof(server_addr))) { 346 syslog(LOG_ERR, "control bind: %m"); 347 exit(1); 348 } 349 if (listen(ctl_sock, 32) < 0) { 350 syslog(LOG_ERR, "control listen: %m"); 351 exit(1); 352 } 353 /* 354 * Loop forever accepting connection requests and forking off 355 * children to handle them. 356 */ 357 while (1) { 358 addrlen = sizeof(his_addr); 359 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 360 if (fork() == 0) { 361 /* child */ 362 (void) dup2(fd, 0); 363 (void) dup2(fd, 1); 364 close(ctl_sock); 365 break; 366 } 367 close(fd); 368 } 369 } else { 370 addrlen = sizeof(his_addr); 371 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 372 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 373 exit(1); 374 } 375 } 376 377 (void) signal(SIGCHLD, SIG_IGN); 378 (void) signal(SIGPIPE, lostconn); 379 if ((int)signal(SIGURG, myoob) < 0) 380 syslog(LOG_ERR, "signal: %m"); 381 382 #ifdef SKEY 383 strcpy(addr_string, inet_ntoa(his_addr.sin_addr)); 384 #endif 385 addrlen = sizeof(ctrl_addr); 386 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 387 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 388 exit(1); 389 } 390 #ifdef IP_TOS 391 tos = IPTOS_LOWDELAY; 392 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 393 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 394 #endif 395 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 396 397 /* Try to handle urgent data inline */ 398 #ifdef SO_OOBINLINE 399 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 400 syslog(LOG_ERR, "setsockopt: %m"); 401 #endif 402 403 #ifdef F_SETOWN 404 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 405 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 406 #endif 407 dolog(&his_addr); 408 /* 409 * Set up default state 410 */ 411 data = -1; 412 type = TYPE_A; 413 form = FORM_N; 414 stru = STRU_F; 415 mode = MODE_S; 416 tmpline[0] = '\0'; 417 418 /* If logins are disabled, print out the message. */ 419 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 420 while (fgets(line, sizeof(line), fd) != NULL) { 421 if ((cp = strchr(line, '\n')) != NULL) 422 *cp = '\0'; 423 lreply(530, "%s", line); 424 } 425 (void) fflush(stdout); 426 (void) fclose(fd); 427 reply(530, "System not available."); 428 exit(0); 429 } 430 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 431 while (fgets(line, sizeof(line), fd) != NULL) { 432 if ((cp = strchr(line, '\n')) != NULL) 433 *cp = '\0'; 434 lreply(220, "%s", line); 435 } 436 (void) fflush(stdout); 437 (void) fclose(fd); 438 /* reply(220,) must follow */ 439 } 440 (void) gethostname(hostname, sizeof(hostname)); 441 reply(220, "%s FTP server (%s) ready.", hostname, version); 442 (void) setjmp(errcatch); 443 for (;;) 444 (void) yyparse(); 445 /* NOTREACHED */ 446 } 447 448 static void 449 lostconn(signo) 450 int signo; 451 { 452 453 if (debug) 454 syslog(LOG_DEBUG, "lost connection"); 455 dologout(-1); 456 } 457 458 static char ttyline[20]; 459 460 /* 461 * Helper function for sgetpwnam(). 462 */ 463 static char * 464 sgetsave(s) 465 char *s; 466 { 467 char *new = malloc((unsigned) strlen(s) + 1); 468 469 if (new == NULL) { 470 perror_reply(421, "Local resource failure: malloc"); 471 dologout(1); 472 /* NOTREACHED */ 473 } 474 (void) strcpy(new, s); 475 return (new); 476 } 477 478 /* 479 * Save the result of a getpwnam. Used for USER command, since 480 * the data returned must not be clobbered by any other command 481 * (e.g., globbing). 482 */ 483 static struct passwd * 484 sgetpwnam(name) 485 char *name; 486 { 487 static struct passwd save; 488 struct passwd *p; 489 490 if ((p = getpwnam(name)) == NULL) 491 return (p); 492 if (save.pw_name) { 493 free(save.pw_name); 494 free(save.pw_passwd); 495 free(save.pw_gecos); 496 free(save.pw_dir); 497 free(save.pw_shell); 498 } 499 save = *p; 500 save.pw_name = sgetsave(p->pw_name); 501 save.pw_passwd = sgetsave(p->pw_passwd); 502 save.pw_gecos = sgetsave(p->pw_gecos); 503 save.pw_dir = sgetsave(p->pw_dir); 504 save.pw_shell = sgetsave(p->pw_shell); 505 return (&save); 506 } 507 508 static int login_attempts; /* number of failed login attempts */ 509 static int askpasswd; /* had user command, ask for passwd */ 510 static char curname[10]; /* current USER name */ 511 512 /* 513 * USER command. 514 * Sets global passwd pointer pw if named account exists and is acceptable; 515 * sets askpasswd if a PASS command is expected. If logged in previously, 516 * need to reset state. If name is "ftp" or "anonymous", the name is not in 517 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 518 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 519 * requesting login privileges. Disallow anyone who does not have a standard 520 * shell as returned by getusershell(). Disallow anyone mentioned in the file 521 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 522 */ 523 void 524 user(name) 525 char *name; 526 { 527 char *cp, *shell; 528 529 if (logged_in) { 530 if (guest) { 531 reply(530, "Can't change user from guest login."); 532 return; 533 } 534 end_login(); 535 } 536 537 guest = 0; 538 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 539 if (checkuser("ftp") || checkuser("anonymous")) 540 reply(530, "User %s access denied.", name); 541 else if ((pw = sgetpwnam("ftp")) != NULL) { 542 guest = 1; 543 askpasswd = 1; 544 reply(331, 545 "Guest login ok, send your email address as password."); 546 } else 547 reply(530, "User %s unknown.", name); 548 if (!askpasswd && logging) 549 syslog(LOG_NOTICE, 550 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 551 return; 552 } 553 if (pw = sgetpwnam(name)) { 554 if ((shell = pw->pw_shell) == NULL || *shell == 0) 555 shell = _PATH_BSHELL; 556 while ((cp = getusershell()) != NULL) 557 if (strcmp(cp, shell) == 0) 558 break; 559 endusershell(); 560 561 if (cp == NULL || checkuser(name)) { 562 reply(530, "User %s access denied.", name); 563 if (logging) 564 syslog(LOG_NOTICE, 565 "FTP LOGIN REFUSED FROM %s, %s", 566 remotehost, name); 567 pw = (struct passwd *) NULL; 568 return; 569 } 570 } 571 if (logging) 572 strncpy(curname, name, sizeof(curname)-1); 573 #ifdef SKEY 574 pwok = skeyaccess(name, NULL, remotehost, addr_string); 575 reply(331, "%s", skey_challenge(name, pw, pwok)); 576 #else 577 reply(331, "Password required for %s.", name); 578 #endif 579 askpasswd = 1; 580 /* 581 * Delay before reading passwd after first failed 582 * attempt to slow down passwd-guessing programs. 583 */ 584 if (login_attempts) 585 sleep((unsigned) login_attempts); 586 } 587 588 /* 589 * Check if a user is in the file _PATH_FTPUSERS 590 */ 591 static int 592 checkuser(name) 593 char *name; 594 { 595 FILE *fd; 596 int found = 0; 597 char *p, line[BUFSIZ]; 598 599 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 600 while (fgets(line, sizeof(line), fd) != NULL) 601 if ((p = strchr(line, '\n')) != NULL) { 602 *p = '\0'; 603 if (line[0] == '#') 604 continue; 605 if (strcmp(line, name) == 0) { 606 found = 1; 607 break; 608 } 609 } 610 (void) fclose(fd); 611 } 612 return (found); 613 } 614 615 /* 616 * Terminate login as previous user, if any, resetting state; 617 * used when USER command is given or login fails. 618 */ 619 static void 620 end_login() 621 { 622 623 (void) seteuid((uid_t)0); 624 if (logged_in) 625 logwtmp(ttyline, "", ""); 626 pw = NULL; 627 logged_in = 0; 628 guest = 0; 629 } 630 631 void 632 pass(passwd) 633 char *passwd; 634 { 635 char *salt, *xpasswd; 636 FILE *fd; 637 static char homedir[MAXPATHLEN]; 638 639 if (logged_in || askpasswd == 0) { 640 reply(503, "Login with USER first."); 641 return; 642 } 643 askpasswd = 0; 644 if (!guest) { /* "ftp" is only account allowed no password */ 645 if (pw == NULL) 646 salt = "xx"; 647 else 648 salt = pw->pw_passwd; 649 #ifdef SKEY 650 xpasswd = skey_crypt(passwd, salt, pw, pwok); 651 pwok = 0; 652 #else 653 xpasswd = crypt(passwd, salt); 654 #endif 655 /* The strcmp does not catch null passwords! */ 656 if (pw == NULL || *pw->pw_passwd == '\0' || 657 (pw->pw_expire && time(NULL) >= pw->pw_expire) || 658 strcmp(xpasswd, pw->pw_passwd)) { 659 reply(530, "Login incorrect."); 660 if (logging) 661 syslog(LOG_NOTICE, 662 "FTP LOGIN FAILED FROM %s, %s", 663 remotehost, curname); 664 pw = NULL; 665 if (login_attempts++ >= 5) { 666 syslog(LOG_NOTICE, 667 "repeated login failures from %s", 668 remotehost); 669 exit(0); 670 } 671 return; 672 } 673 } 674 login_attempts = 0; /* this time successful */ 675 if (setegid((gid_t)pw->pw_gid) < 0) { 676 reply(550, "Can't set gid."); 677 return; 678 } 679 (void) initgroups(pw->pw_name, pw->pw_gid); 680 681 /* open wtmp before chroot */ 682 (void)sprintf(ttyline, "ftp%d", getpid()); 683 logwtmp(ttyline, pw->pw_name, remotehost); 684 logged_in = 1; 685 686 #ifdef STATS 687 if (guest && stats == 1 && statfd < 0) 688 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 689 stats = 0; 690 #endif 691 692 if (guest) { 693 /* 694 * We MUST do a chdir() after the chroot. Otherwise 695 * the old current directory will be accessible as "." 696 * outside the new root! 697 */ 698 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 699 reply(550, "Can't set guest privileges."); 700 goto bad; 701 } 702 } else if (chdir(pw->pw_dir) < 0) { 703 if (chdir("/") < 0) { 704 reply(530, "User %s: can't change directory to %s.", 705 pw->pw_name, pw->pw_dir); 706 goto bad; 707 } else 708 lreply(230, "No directory! Logging in with home=/"); 709 } 710 if (seteuid((uid_t)pw->pw_uid) < 0) { 711 reply(550, "Can't set uid."); 712 goto bad; 713 } 714 715 /* 716 * Set home directory so that use of ~ (tilde) works correctly. 717 */ 718 if (getcwd(homedir, MAXPATHLEN) != NULL) 719 setenv("HOME", homedir, 1); 720 721 /* 722 * Display a login message, if it exists. 723 * N.B. reply(230,) must follow the message. 724 */ 725 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 726 char *cp, line[LINE_MAX]; 727 728 while (fgets(line, sizeof(line), fd) != NULL) { 729 if ((cp = strchr(line, '\n')) != NULL) 730 *cp = '\0'; 731 lreply(230, "%s", line); 732 } 733 (void) fflush(stdout); 734 (void) fclose(fd); 735 } 736 if (guest) { 737 #ifdef STATS 738 char * copy(); 739 740 if (ident != NULL) 741 free(ident); 742 ident = (char *) copy(passwd); 743 #endif 744 reply(230, "Guest login ok, access restrictions apply."); 745 #ifdef SETPROCTITLE 746 snprintf(proctitle, sizeof(proctitle), 747 "%s: anonymous/%.*s", remotehost, 748 sizeof(proctitle) - sizeof(remotehost) - 749 sizeof(": anonymous/"), passwd); 750 setproctitle("%s", proctitle); 751 #endif /* SETPROCTITLE */ 752 if (logging) 753 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 754 remotehost, passwd); 755 } else { 756 reply(230, "User %s logged in.", pw->pw_name); 757 #ifdef SETPROCTITLE 758 snprintf(proctitle, sizeof(proctitle), 759 "%s: %s", remotehost, pw->pw_name); 760 setproctitle("%s", proctitle); 761 #endif /* SETPROCTITLE */ 762 if (logging) 763 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 764 remotehost, pw->pw_name); 765 } 766 (void) umask(defumask); 767 return; 768 bad: 769 /* Forget all about it... */ 770 end_login(); 771 } 772 773 void 774 retrieve(cmd, name) 775 char *cmd, *name; 776 { 777 FILE *fin, *dout; 778 struct stat st; 779 int (*closefunc) __P((FILE *)); 780 #ifdef STATS 781 long start; 782 #endif 783 784 if (cmd == 0) { 785 fin = fopen(name, "r"), closefunc = fclose; 786 st.st_size = 0; 787 } else { 788 char line[BUFSIZ]; 789 790 (void) sprintf(line, cmd, name), name = line; 791 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 792 st.st_size = -1; 793 st.st_blksize = BUFSIZ; 794 } 795 if (fin == NULL) { 796 if (errno != 0) { 797 perror_reply(550, name); 798 if (cmd == 0) { 799 LOGCMD("get", name); 800 } 801 } 802 return; 803 } 804 byte_count = -1; 805 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 806 reply(550, "%s: not a plain file.", name); 807 goto done; 808 } 809 if (restart_point) { 810 if (type == TYPE_A) { 811 off_t i, n; 812 int c; 813 814 n = restart_point; 815 i = 0; 816 while (i++ < n) { 817 if ((c=getc(fin)) == EOF) { 818 perror_reply(550, name); 819 goto done; 820 } 821 if (c == '\n') 822 i++; 823 } 824 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 825 perror_reply(550, name); 826 goto done; 827 } 828 } 829 dout = dataconn(name, st.st_size, "w"); 830 if (dout == NULL) 831 goto done; 832 #ifdef STATS 833 time(&start); 834 #endif 835 send_data(fin, dout, st.st_blksize, st.st_size, 836 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 837 #ifdef STATS 838 if (cmd == 0 && guest && stats) 839 logxfer( name, st.st_size, start); 840 #endif 841 (void) fclose(dout); 842 data = -1; 843 pdata = -1; 844 done: 845 if (cmd == 0) 846 LOGBYTES("get", name, byte_count); 847 (*closefunc)(fin); 848 } 849 850 void 851 store(name, mode, unique) 852 char *name, *mode; 853 int unique; 854 { 855 FILE *fout, *din; 856 struct stat st; 857 int (*closefunc) __P((FILE *)); 858 859 if (unique && stat(name, &st) == 0 && 860 (name = gunique(name)) == NULL) { 861 LOGCMD(*mode == 'w' ? "put" : "append", name); 862 return; 863 } 864 865 if (restart_point) 866 mode = "r+"; 867 fout = fopen(name, mode); 868 closefunc = fclose; 869 if (fout == NULL) { 870 perror_reply(553, name); 871 LOGCMD(*mode == 'w' ? "put" : "append", name); 872 return; 873 } 874 byte_count = -1; 875 if (restart_point) { 876 if (type == TYPE_A) { 877 off_t i, n; 878 int c; 879 880 n = restart_point; 881 i = 0; 882 while (i++ < n) { 883 if ((c=getc(fout)) == EOF) { 884 perror_reply(550, name); 885 goto done; 886 } 887 if (c == '\n') 888 i++; 889 } 890 /* 891 * We must do this seek to "current" position 892 * because we are changing from reading to 893 * writing. 894 */ 895 if (fseek(fout, 0L, L_INCR) < 0) { 896 perror_reply(550, name); 897 goto done; 898 } 899 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 900 perror_reply(550, name); 901 goto done; 902 } 903 } 904 din = dataconn(name, (off_t)-1, "r"); 905 if (din == NULL) 906 goto done; 907 if (receive_data(din, fout) == 0) { 908 if (unique) 909 reply(226, "Transfer complete (unique file name:%s).", 910 name); 911 else 912 reply(226, "Transfer complete."); 913 } 914 (void) fclose(din); 915 data = -1; 916 pdata = -1; 917 done: 918 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 919 (*closefunc)(fout); 920 } 921 922 static FILE * 923 getdatasock(mode) 924 char *mode; 925 { 926 int on = 1, s, t, tries; 927 928 if (data >= 0) 929 return (fdopen(data, mode)); 930 (void) seteuid((uid_t)0); 931 s = socket(AF_INET, SOCK_STREAM, 0); 932 if (s < 0) 933 goto bad; 934 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 935 (char *) &on, sizeof(on)) < 0) 936 goto bad; 937 /* anchor socket to avoid multi-homing problems */ 938 data_source.sin_family = AF_INET; 939 data_source.sin_addr = ctrl_addr.sin_addr; 940 for (tries = 1; ; tries++) { 941 if (bind(s, (struct sockaddr *)&data_source, 942 sizeof(data_source)) >= 0) 943 break; 944 if (errno != EADDRINUSE || tries > 10) 945 goto bad; 946 sleep(tries); 947 } 948 (void) seteuid((uid_t)pw->pw_uid); 949 #ifdef IP_TOS 950 on = IPTOS_THROUGHPUT; 951 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 952 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 953 #endif 954 #ifdef TCP_NOPUSH 955 /* 956 * Turn off push flag to keep sender TCP from sending short packets 957 * at the boundaries of each write(). Should probably do a SO_SNDBUF 958 * to set the send buffer size as well, but that may not be desirable 959 * in heavy-load situations. 960 */ 961 on = 1; 962 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 963 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 964 #endif 965 #ifdef SO_SNDBUF 966 on = 65536; 967 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 968 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 969 #endif 970 971 return (fdopen(s, mode)); 972 bad: 973 /* Return the real value of errno (close may change it) */ 974 t = errno; 975 (void) seteuid((uid_t)pw->pw_uid); 976 (void) close(s); 977 errno = t; 978 return (NULL); 979 } 980 981 static FILE * 982 dataconn(name, size, mode) 983 char *name; 984 off_t size; 985 char *mode; 986 { 987 char sizebuf[32]; 988 FILE *file; 989 int retry = 0, tos; 990 991 file_size = size; 992 byte_count = 0; 993 if (size != (off_t) -1) 994 (void) sprintf(sizebuf, " (%qd bytes)", size); 995 else 996 (void) strcpy(sizebuf, ""); 997 if (pdata >= 0) { 998 struct sockaddr_in from; 999 int s, fromlen = sizeof(from); 1000 struct timeval timeout; 1001 fd_set set; 1002 1003 FD_ZERO(&set); 1004 FD_SET(pdata, &set); 1005 1006 timeout.tv_usec = 0; 1007 timeout.tv_sec = 120; 1008 1009 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) == 0 || 1010 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) { 1011 reply(425, "Can't open data connection."); 1012 (void) close(pdata); 1013 pdata = -1; 1014 return (NULL); 1015 } 1016 (void) close(pdata); 1017 pdata = s; 1018 #ifdef IP_TOS 1019 tos = IPTOS_LOWDELAY; 1020 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 1021 sizeof(int)); 1022 #endif 1023 reply(150, "Opening %s mode data connection for '%s'%s.", 1024 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1025 return (fdopen(pdata, mode)); 1026 } 1027 if (data >= 0) { 1028 reply(125, "Using existing data connection for '%s'%s.", 1029 name, sizebuf); 1030 usedefault = 1; 1031 return (fdopen(data, mode)); 1032 } 1033 if (usedefault) 1034 data_dest = his_addr; 1035 usedefault = 1; 1036 file = getdatasock(mode); 1037 if (file == NULL) { 1038 reply(425, "Can't create data socket (%s,%d): %s.", 1039 inet_ntoa(data_source.sin_addr), 1040 ntohs(data_source.sin_port), strerror(errno)); 1041 return (NULL); 1042 } 1043 data = fileno(file); 1044 while (connect(data, (struct sockaddr *)&data_dest, 1045 sizeof(data_dest)) < 0) { 1046 if (errno == EADDRINUSE && retry < swaitmax) { 1047 sleep((unsigned) swaitint); 1048 retry += swaitint; 1049 continue; 1050 } 1051 perror_reply(425, "Can't build data connection"); 1052 (void) fclose(file); 1053 data = -1; 1054 return (NULL); 1055 } 1056 reply(150, "Opening %s mode data connection for '%s'%s.", 1057 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1058 return (file); 1059 } 1060 1061 /* 1062 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1063 * encapsulation of the data subject to Mode, Structure, and Type. 1064 * 1065 * NB: Form isn't handled. 1066 */ 1067 static void 1068 send_data(instr, outstr, blksize, filesize, isreg) 1069 FILE *instr, *outstr; 1070 off_t blksize; 1071 off_t filesize; 1072 int isreg; 1073 { 1074 int c, cnt, filefd, netfd; 1075 char *buf, *bp; 1076 size_t len; 1077 1078 transflag++; 1079 if (setjmp(urgcatch)) { 1080 transflag = 0; 1081 return; 1082 } 1083 switch (type) { 1084 1085 case TYPE_A: 1086 while ((c = getc(instr)) != EOF) { 1087 byte_count++; 1088 if (c == '\n') { 1089 if (ferror(outstr)) 1090 goto data_err; 1091 (void) putc('\r', outstr); 1092 } 1093 (void) putc(c, outstr); 1094 } 1095 fflush(outstr); 1096 transflag = 0; 1097 if (ferror(instr)) 1098 goto file_err; 1099 if (ferror(outstr)) 1100 goto data_err; 1101 reply(226, "Transfer complete."); 1102 return; 1103 1104 case TYPE_I: 1105 case TYPE_L: 1106 /* 1107 * isreg is only set if we are not doing restart and we 1108 * are sending a regular file 1109 */ 1110 netfd = fileno(outstr); 1111 filefd = fileno(instr); 1112 1113 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1114 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1115 (off_t)0); 1116 if (!buf) { 1117 syslog(LOG_WARNING, "mmap(%lu): %m", 1118 (unsigned long)filesize); 1119 goto oldway; 1120 } 1121 bp = buf; 1122 len = filesize; 1123 do { 1124 cnt = write(netfd, bp, len); 1125 len -= cnt; 1126 bp += cnt; 1127 if (cnt > 0) byte_count += cnt; 1128 } while(cnt > 0 && len > 0); 1129 1130 transflag = 0; 1131 munmap(buf, (size_t)filesize); 1132 if (cnt < 0) 1133 goto data_err; 1134 reply(226, "Transfer complete."); 1135 return; 1136 } 1137 1138 oldway: 1139 if ((buf = malloc((u_int)blksize)) == NULL) { 1140 transflag = 0; 1141 perror_reply(451, "Local resource failure: malloc"); 1142 return; 1143 } 1144 1145 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1146 write(netfd, buf, cnt) == cnt) 1147 byte_count += cnt; 1148 transflag = 0; 1149 (void)free(buf); 1150 if (cnt != 0) { 1151 if (cnt < 0) 1152 goto file_err; 1153 goto data_err; 1154 } 1155 reply(226, "Transfer complete."); 1156 return; 1157 default: 1158 transflag = 0; 1159 reply(550, "Unimplemented TYPE %d in send_data", type); 1160 return; 1161 } 1162 1163 data_err: 1164 transflag = 0; 1165 perror_reply(426, "Data connection"); 1166 return; 1167 1168 file_err: 1169 transflag = 0; 1170 perror_reply(551, "Error on input file"); 1171 } 1172 1173 /* 1174 * Transfer data from peer to "outstr" using the appropriate encapulation of 1175 * the data subject to Mode, Structure, and Type. 1176 * 1177 * N.B.: Form isn't handled. 1178 */ 1179 static int 1180 receive_data(instr, outstr) 1181 FILE *instr, *outstr; 1182 { 1183 int c; 1184 int cnt, bare_lfs = 0; 1185 char buf[BUFSIZ]; 1186 1187 transflag++; 1188 if (setjmp(urgcatch)) { 1189 transflag = 0; 1190 return (-1); 1191 } 1192 switch (type) { 1193 1194 case TYPE_I: 1195 case TYPE_L: 1196 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1197 if (write(fileno(outstr), buf, cnt) != cnt) 1198 goto file_err; 1199 byte_count += cnt; 1200 } 1201 if (cnt < 0) 1202 goto data_err; 1203 transflag = 0; 1204 return (0); 1205 1206 case TYPE_E: 1207 reply(553, "TYPE E not implemented."); 1208 transflag = 0; 1209 return (-1); 1210 1211 case TYPE_A: 1212 while ((c = getc(instr)) != EOF) { 1213 byte_count++; 1214 if (c == '\n') 1215 bare_lfs++; 1216 while (c == '\r') { 1217 if (ferror(outstr)) 1218 goto data_err; 1219 if ((c = getc(instr)) != '\n') { 1220 (void) putc ('\r', outstr); 1221 if (c == '\0' || c == EOF) 1222 goto contin2; 1223 } 1224 } 1225 (void) putc(c, outstr); 1226 contin2: ; 1227 } 1228 fflush(outstr); 1229 if (ferror(instr)) 1230 goto data_err; 1231 if (ferror(outstr)) 1232 goto file_err; 1233 transflag = 0; 1234 if (bare_lfs) { 1235 lreply(226, 1236 "WARNING! %d bare linefeeds received in ASCII mode", 1237 bare_lfs); 1238 (void)printf(" File may not have transferred correctly.\r\n"); 1239 } 1240 return (0); 1241 default: 1242 reply(550, "Unimplemented TYPE %d in receive_data", type); 1243 transflag = 0; 1244 return (-1); 1245 } 1246 1247 data_err: 1248 transflag = 0; 1249 perror_reply(426, "Data Connection"); 1250 return (-1); 1251 1252 file_err: 1253 transflag = 0; 1254 perror_reply(452, "Error writing file"); 1255 return (-1); 1256 } 1257 1258 void 1259 statfilecmd(filename) 1260 char *filename; 1261 { 1262 FILE *fin; 1263 int c; 1264 char line[LINE_MAX]; 1265 1266 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1267 fin = ftpd_popen(line, "r"); 1268 lreply(211, "status of %s:", filename); 1269 while ((c = getc(fin)) != EOF) { 1270 if (c == '\n') { 1271 if (ferror(stdout)){ 1272 perror_reply(421, "control connection"); 1273 (void) ftpd_pclose(fin); 1274 dologout(1); 1275 /* NOTREACHED */ 1276 } 1277 if (ferror(fin)) { 1278 perror_reply(551, filename); 1279 (void) ftpd_pclose(fin); 1280 return; 1281 } 1282 (void) putc('\r', stdout); 1283 } 1284 (void) putc(c, stdout); 1285 } 1286 (void) ftpd_pclose(fin); 1287 reply(211, "End of Status"); 1288 } 1289 1290 void 1291 statcmd() 1292 { 1293 struct sockaddr_in *sin; 1294 u_char *a, *p; 1295 1296 lreply(211, "%s FTP server status:", hostname, version); 1297 printf(" %s\r\n", version); 1298 printf(" Connected to %s", remotehost); 1299 if (!isdigit(remotehost[0])) 1300 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1301 printf("\r\n"); 1302 if (logged_in) { 1303 if (guest) 1304 printf(" Logged in anonymously\r\n"); 1305 else 1306 printf(" Logged in as %s\r\n", pw->pw_name); 1307 } else if (askpasswd) 1308 printf(" Waiting for password\r\n"); 1309 else 1310 printf(" Waiting for user name\r\n"); 1311 printf(" TYPE: %s", typenames[type]); 1312 if (type == TYPE_A || type == TYPE_E) 1313 printf(", FORM: %s", formnames[form]); 1314 if (type == TYPE_L) 1315 #if NBBY == 8 1316 printf(" %d", NBBY); 1317 #else 1318 printf(" %d", bytesize); /* need definition! */ 1319 #endif 1320 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1321 strunames[stru], modenames[mode]); 1322 if (data != -1) 1323 printf(" Data connection open\r\n"); 1324 else if (pdata != -1) { 1325 printf(" in Passive mode"); 1326 sin = &pasv_addr; 1327 goto printaddr; 1328 } else if (usedefault == 0) { 1329 printf(" PORT"); 1330 sin = &data_dest; 1331 printaddr: 1332 a = (u_char *) &sin->sin_addr; 1333 p = (u_char *) &sin->sin_port; 1334 #define UC(b) (((int) b) & 0xff) 1335 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1336 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1337 #undef UC 1338 } else 1339 printf(" No data connection\r\n"); 1340 reply(211, "End of status"); 1341 } 1342 1343 void 1344 fatal(s) 1345 char *s; 1346 { 1347 1348 reply(451, "Error in server: %s\n", s); 1349 reply(221, "Closing connection due to server error."); 1350 dologout(0); 1351 /* NOTREACHED */ 1352 } 1353 1354 void 1355 #if __STDC__ 1356 reply(int n, const char *fmt, ...) 1357 #else 1358 reply(n, fmt, va_alist) 1359 int n; 1360 char *fmt; 1361 va_dcl 1362 #endif 1363 { 1364 va_list ap; 1365 #if __STDC__ 1366 va_start(ap, fmt); 1367 #else 1368 va_start(ap); 1369 #endif 1370 (void)printf("%d ", n); 1371 (void)vprintf(fmt, ap); 1372 (void)printf("\r\n"); 1373 (void)fflush(stdout); 1374 if (debug) { 1375 syslog(LOG_DEBUG, "<--- %d ", n); 1376 vsyslog(LOG_DEBUG, fmt, ap); 1377 } 1378 } 1379 1380 void 1381 #if __STDC__ 1382 lreply(int n, const char *fmt, ...) 1383 #else 1384 lreply(n, fmt, va_alist) 1385 int n; 1386 char *fmt; 1387 va_dcl 1388 #endif 1389 { 1390 va_list ap; 1391 #if __STDC__ 1392 va_start(ap, fmt); 1393 #else 1394 va_start(ap); 1395 #endif 1396 (void)printf("%d- ", n); 1397 (void)vprintf(fmt, ap); 1398 (void)printf("\r\n"); 1399 (void)fflush(stdout); 1400 if (debug) { 1401 syslog(LOG_DEBUG, "<--- %d- ", n); 1402 vsyslog(LOG_DEBUG, fmt, ap); 1403 } 1404 } 1405 1406 static void 1407 ack(s) 1408 char *s; 1409 { 1410 1411 reply(250, "%s command successful.", s); 1412 } 1413 1414 void 1415 nack(s) 1416 char *s; 1417 { 1418 1419 reply(502, "%s command not implemented.", s); 1420 } 1421 1422 /* ARGSUSED */ 1423 void 1424 yyerror(s) 1425 char *s; 1426 { 1427 char *cp; 1428 1429 if (cp = strchr(cbuf,'\n')) 1430 *cp = '\0'; 1431 reply(500, "'%s': command not understood.", cbuf); 1432 } 1433 1434 void 1435 delete(name) 1436 char *name; 1437 { 1438 struct stat st; 1439 1440 LOGCMD("delete", name); 1441 if (stat(name, &st) < 0) { 1442 perror_reply(550, name); 1443 return; 1444 } 1445 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1446 if (rmdir(name) < 0) { 1447 perror_reply(550, name); 1448 return; 1449 } 1450 goto done; 1451 } 1452 if (unlink(name) < 0) { 1453 perror_reply(550, name); 1454 return; 1455 } 1456 done: 1457 ack("DELE"); 1458 } 1459 1460 void 1461 cwd(path) 1462 char *path; 1463 { 1464 1465 if (chdir(path) < 0) 1466 perror_reply(550, path); 1467 else 1468 ack("CWD"); 1469 } 1470 1471 void 1472 makedir(name) 1473 char *name; 1474 { 1475 1476 LOGCMD("mkdir", name); 1477 if (mkdir(name, 0777) < 0) 1478 perror_reply(550, name); 1479 else 1480 reply(257, "MKD command successful."); 1481 } 1482 1483 void 1484 removedir(name) 1485 char *name; 1486 { 1487 1488 LOGCMD("rmdir", name); 1489 if (rmdir(name) < 0) 1490 perror_reply(550, name); 1491 else 1492 ack("RMD"); 1493 } 1494 1495 void 1496 pwd() 1497 { 1498 char path[MAXPATHLEN + 1]; 1499 1500 if (getwd(path) == (char *)NULL) 1501 reply(550, "%s.", path); 1502 else 1503 reply(257, "\"%s\" is current directory.", path); 1504 } 1505 1506 char * 1507 renamefrom(name) 1508 char *name; 1509 { 1510 struct stat st; 1511 1512 if (stat(name, &st) < 0) { 1513 perror_reply(550, name); 1514 return ((char *)0); 1515 } 1516 reply(350, "File exists, ready for destination name"); 1517 return (name); 1518 } 1519 1520 void 1521 renamecmd(from, to) 1522 char *from, *to; 1523 { 1524 1525 LOGCMD2("rename", from, to); 1526 if (rename(from, to) < 0) 1527 perror_reply(550, "rename"); 1528 else 1529 ack("RNTO"); 1530 } 1531 1532 static void 1533 dolog(sin) 1534 struct sockaddr_in *sin; 1535 { 1536 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1537 sizeof(struct in_addr), AF_INET); 1538 1539 if (hp) 1540 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1541 else 1542 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1543 sizeof(remotehost)); 1544 #ifdef SETPROCTITLE 1545 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1546 setproctitle("%s", proctitle); 1547 #endif /* SETPROCTITLE */ 1548 1549 if (logging) 1550 syslog(LOG_INFO, "connection from %s", remotehost); 1551 } 1552 1553 /* 1554 * Record logout in wtmp file 1555 * and exit with supplied status. 1556 */ 1557 void 1558 dologout(status) 1559 int status; 1560 { 1561 1562 if (logged_in) { 1563 (void) seteuid((uid_t)0); 1564 logwtmp(ttyline, "", ""); 1565 } 1566 /* beware of flushing buffers after a SIGPIPE */ 1567 _exit(status); 1568 } 1569 1570 static void 1571 myoob(signo) 1572 int signo; 1573 { 1574 char *cp; 1575 1576 /* only process if transfer occurring */ 1577 if (!transflag) 1578 return; 1579 cp = tmpline; 1580 if (getline(cp, 7, stdin) == NULL) { 1581 reply(221, "You could at least say goodbye."); 1582 dologout(0); 1583 } 1584 upper(cp); 1585 if (strcmp(cp, "ABOR\r\n") == 0) { 1586 tmpline[0] = '\0'; 1587 reply(426, "Transfer aborted. Data connection closed."); 1588 reply(226, "Abort successful"); 1589 longjmp(urgcatch, 1); 1590 } 1591 if (strcmp(cp, "STAT\r\n") == 0) { 1592 if (file_size != (off_t) -1) 1593 reply(213, "Status: %qd of %qd bytes transferred", 1594 byte_count, file_size); 1595 else 1596 reply(213, "Status: %qd bytes transferred", byte_count); 1597 } 1598 } 1599 1600 /* 1601 * Note: a response of 425 is not mentioned as a possible response to 1602 * the PASV command in RFC959. However, it has been blessed as 1603 * a legitimate response by Jon Postel in a telephone conversation 1604 * with Rick Adams on 25 Jan 89. 1605 */ 1606 void 1607 passive() 1608 { 1609 int len; 1610 u_short port; 1611 char *p, *a; 1612 1613 if (pw == NULL) { 1614 reply(530, "Please login with USER and PASS"); 1615 return; 1616 } 1617 pdata = socket(AF_INET, SOCK_STREAM, 0); 1618 if (pdata < 0) { 1619 perror_reply(425, "Can't open passive connection"); 1620 return; 1621 } 1622 1623 if (restricted_data_ports) { 1624 for (port = FTP_DATA_BOTTOM; port <= FTP_DATA_TOP; port++) { 1625 pasv_addr = ctrl_addr; 1626 pasv_addr.sin_port = htons(port); 1627 (void) seteuid((uid_t)0); 1628 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1629 sizeof(pasv_addr)) < 0) { 1630 (void) seteuid((uid_t)pw->pw_uid); 1631 if (errno == EADDRINUSE) 1632 continue; 1633 else 1634 goto pasv_error; 1635 } 1636 (void) seteuid((uid_t)pw->pw_uid); 1637 break; 1638 } 1639 if (port > FTP_DATA_TOP) 1640 goto pasv_error; 1641 } else { 1642 pasv_addr = ctrl_addr; 1643 pasv_addr.sin_port = 0; 1644 (void) seteuid((uid_t)0); 1645 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1646 sizeof(pasv_addr)) < 0) { 1647 (void) seteuid((uid_t)pw->pw_uid); 1648 goto pasv_error; 1649 } 1650 (void) seteuid((uid_t)pw->pw_uid); 1651 } 1652 1653 len = sizeof(pasv_addr); 1654 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1655 goto pasv_error; 1656 if (listen(pdata, 1) < 0) 1657 goto pasv_error; 1658 a = (char *) &pasv_addr.sin_addr; 1659 p = (char *) &pasv_addr.sin_port; 1660 1661 #define UC(b) (((int) b) & 0xff) 1662 1663 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1664 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1665 return; 1666 1667 pasv_error: 1668 (void) close(pdata); 1669 pdata = -1; 1670 perror_reply(425, "Can't open passive connection"); 1671 return; 1672 } 1673 1674 /* 1675 * Generate unique name for file with basename "local". 1676 * The file named "local" is already known to exist. 1677 * Generates failure reply on error. 1678 */ 1679 static char * 1680 gunique(local) 1681 char *local; 1682 { 1683 static char new[MAXPATHLEN]; 1684 struct stat st; 1685 int count; 1686 char *cp; 1687 1688 cp = strrchr(local, '/'); 1689 if (cp) 1690 *cp = '\0'; 1691 if (stat(cp ? local : ".", &st) < 0) { 1692 perror_reply(553, cp ? local : "."); 1693 return ((char *) 0); 1694 } 1695 if (cp) 1696 *cp = '/'; 1697 (void) strcpy(new, local); 1698 cp = new + strlen(new); 1699 *cp++ = '.'; 1700 for (count = 1; count < 100; count++) { 1701 (void)sprintf(cp, "%d", count); 1702 if (stat(new, &st) < 0) 1703 return (new); 1704 } 1705 reply(452, "Unique file name cannot be created."); 1706 return (NULL); 1707 } 1708 1709 /* 1710 * Format and send reply containing system error number. 1711 */ 1712 void 1713 perror_reply(code, string) 1714 int code; 1715 char *string; 1716 { 1717 1718 reply(code, "%s: %s.", string, strerror(errno)); 1719 } 1720 1721 static char *onefile[] = { 1722 "", 1723 0 1724 }; 1725 1726 void 1727 send_file_list(whichf) 1728 char *whichf; 1729 { 1730 struct stat st; 1731 DIR *dirp = NULL; 1732 struct dirent *dir; 1733 FILE *dout = NULL; 1734 char **dirlist, *dirname; 1735 int simple = 0; 1736 int freeglob = 0; 1737 glob_t gl; 1738 1739 if (strpbrk(whichf, "~{[*?") != NULL) { 1740 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1741 1742 memset(&gl, 0, sizeof(gl)); 1743 freeglob = 1; 1744 if (glob(whichf, flags, 0, &gl)) { 1745 reply(550, "not found"); 1746 goto out; 1747 } else if (gl.gl_pathc == 0) { 1748 errno = ENOENT; 1749 perror_reply(550, whichf); 1750 goto out; 1751 } 1752 dirlist = gl.gl_pathv; 1753 } else { 1754 onefile[0] = whichf; 1755 dirlist = onefile; 1756 simple = 1; 1757 } 1758 1759 if (setjmp(urgcatch)) { 1760 transflag = 0; 1761 goto out; 1762 } 1763 while (dirname = *dirlist++) { 1764 if (stat(dirname, &st) < 0) { 1765 /* 1766 * If user typed "ls -l", etc, and the client 1767 * used NLST, do what the user meant. 1768 */ 1769 if (dirname[0] == '-' && *dirlist == NULL && 1770 transflag == 0) { 1771 retrieve("/bin/ls %s", dirname); 1772 goto out; 1773 } 1774 perror_reply(550, whichf); 1775 if (dout != NULL) { 1776 (void) fclose(dout); 1777 transflag = 0; 1778 data = -1; 1779 pdata = -1; 1780 } 1781 goto out; 1782 } 1783 1784 if (S_ISREG(st.st_mode)) { 1785 if (dout == NULL) { 1786 dout = dataconn("file list", (off_t)-1, "w"); 1787 if (dout == NULL) 1788 goto out; 1789 transflag++; 1790 } 1791 fprintf(dout, "%s%s\n", dirname, 1792 type == TYPE_A ? "\r" : ""); 1793 byte_count += strlen(dirname) + 1; 1794 continue; 1795 } else if (!S_ISDIR(st.st_mode)) 1796 continue; 1797 1798 if ((dirp = opendir(dirname)) == NULL) 1799 continue; 1800 1801 while ((dir = readdir(dirp)) != NULL) { 1802 char nbuf[MAXPATHLEN]; 1803 1804 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1805 continue; 1806 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1807 dir->d_namlen == 2) 1808 continue; 1809 1810 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1811 1812 /* 1813 * We have to do a stat to insure it's 1814 * not a directory or special file. 1815 */ 1816 if (simple || (stat(nbuf, &st) == 0 && 1817 S_ISREG(st.st_mode))) { 1818 if (dout == NULL) { 1819 dout = dataconn("file list", (off_t)-1, 1820 "w"); 1821 if (dout == NULL) 1822 goto out; 1823 transflag++; 1824 } 1825 if (nbuf[0] == '.' && nbuf[1] == '/') 1826 fprintf(dout, "%s%s\n", &nbuf[2], 1827 type == TYPE_A ? "\r" : ""); 1828 else 1829 fprintf(dout, "%s%s\n", nbuf, 1830 type == TYPE_A ? "\r" : ""); 1831 byte_count += strlen(nbuf) + 1; 1832 } 1833 } 1834 (void) closedir(dirp); 1835 } 1836 1837 if (dout == NULL) 1838 reply(550, "No files found."); 1839 else if (ferror(dout) != 0) 1840 perror_reply(550, "Data connection"); 1841 else 1842 reply(226, "Transfer complete."); 1843 1844 transflag = 0; 1845 if (dout != NULL) 1846 (void) fclose(dout); 1847 data = -1; 1848 pdata = -1; 1849 out: 1850 if (freeglob) { 1851 freeglob = 0; 1852 globfree(&gl); 1853 } 1854 } 1855 1856 void 1857 reapchild(signo) 1858 int signo; 1859 { 1860 while (wait3(NULL, WNOHANG, NULL) > 0); 1861 } 1862 1863 #ifdef OLD_SETPROCTITLE 1864 /* 1865 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 1866 * Warning, since this is usually started from inetd.conf, it often doesn't 1867 * have much of an environment or arglist to overwrite. 1868 */ 1869 void 1870 #if __STDC__ 1871 setproctitle(const char *fmt, ...) 1872 #else 1873 setproctitle(fmt, va_alist) 1874 char *fmt; 1875 va_dcl 1876 #endif 1877 { 1878 int i; 1879 va_list ap; 1880 char *p, *bp, ch; 1881 char buf[LINE_MAX]; 1882 1883 #if __STDC__ 1884 va_start(ap, fmt); 1885 #else 1886 va_start(ap); 1887 #endif 1888 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 1889 1890 /* make ps print our process name */ 1891 p = Argv[0]; 1892 *p++ = '-'; 1893 1894 i = strlen(buf); 1895 if (i > LastArgv - p - 2) { 1896 i = LastArgv - p - 2; 1897 buf[i] = '\0'; 1898 } 1899 bp = buf; 1900 while (ch = *bp++) 1901 if (ch != '\n' && ch != '\r') 1902 *p++ = ch; 1903 while (p < LastArgv) 1904 *p++ = ' '; 1905 } 1906 #endif /* OLD_SETPROCTITLE */ 1907 1908 #ifdef STATS 1909 logxfer(name, size, start) 1910 char *name; 1911 long size; 1912 long start; 1913 { 1914 char buf[1024]; 1915 char path[MAXPATHLEN + 1]; 1916 long now; 1917 1918 if (statfd >= 0 && getwd(path) != NULL) { 1919 time(&now); 1920 sprintf(buf, "%.20s!%s!%s!%s/%s!%ld!%ld\n", 1921 ctime(&now)+4, ident, remotehost, 1922 path, name, size, now - start + (now == start)); 1923 write(statfd, buf, strlen(buf)); 1924 } 1925 } 1926 1927 char * 1928 copy(s) 1929 char *s; 1930 { 1931 char *p; 1932 1933 p = malloc((unsigned) strlen(s) + 1); 1934 if (p == NULL) 1935 fatal("Ran out of memory."); 1936 (void) strcpy(p, s); 1937 return (p); 1938 } 1939 #endif 1940