ftpd.c revision 13139
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 1.13 1995/11/29 19:52:30 guido Exp $ 34 */ 35 36#ifndef lint 37static 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 43static 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 98static char version[] = "Version 6.00"; 99 100extern off_t restart_point; 101extern char cbuf[]; 102 103struct sockaddr_in ctrl_addr; 104struct sockaddr_in data_source; 105struct sockaddr_in data_dest; 106struct sockaddr_in his_addr; 107struct sockaddr_in pasv_addr; 108 109int data; 110jmp_buf errcatch, urgcatch; 111int logged_in; 112struct passwd *pw; 113int debug; 114int timeout = 900; /* timeout after 15 minutes of inactivity */ 115int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 116int logging; 117int restricted_data_ports = 1; 118int guest; 119#ifdef STATS 120int stats; 121int statfd = -1; 122#endif 123int type; 124int form; 125int stru; /* avoid C keyword */ 126int mode; 127int usedefault = 1; /* for data transfers */ 128int pdata = -1; /* for passive mode */ 129sig_atomic_t transflag; 130off_t file_size; 131off_t byte_count; 132#if !defined(CMASK) || CMASK == 0 133#undef CMASK 134#define CMASK 027 135#endif 136int defumask = CMASK; /* default umask value */ 137char tmpline[7]; 138char hostname[MAXHOSTNAMELEN]; 139char remotehost[MAXHOSTNAMELEN]; 140#ifdef STATS 141char *ident = NULL; 142#endif 143 144/* 145 * Timeout intervals for retrying connections 146 * to hosts that don't accept PORT cmds. This 147 * is a kludge, but given the problems with TCP... 148 */ 149#define SWAITMAX 90 /* wait at most 90 seconds */ 150#define SWAITINT 5 /* interval between retries */ 151 152int swaitmax = SWAITMAX; 153int swaitint = SWAITINT; 154 155#ifdef SETPROCTITLE 156#ifdef OLD_SETPROCTITLE 157char **Argv = NULL; /* pointer to argument vector */ 158char *LastArgv = NULL; /* end of argv */ 159#endif /* OLD_SETPROCTITLE */ 160char proctitle[LINE_MAX]; /* initial part of title */ 161#endif /* SETPROCTITLE */ 162 163#ifdef SKEY 164int pwok = 0; 165char addr_string[20]; /* XXX */ 166#endif 167 168#define LOGCMD(cmd, file) \ 169 if (logging > 1) \ 170 syslog(LOG_INFO,"%s %s%s", cmd, \ 171 *(file) == '/' ? "" : curdir(), file); 172#define LOGCMD2(cmd, file1, file2) \ 173 if (logging > 1) \ 174 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 175 *(file1) == '/' ? "" : curdir(), file1, \ 176 *(file2) == '/' ? "" : curdir(), file2); 177#define LOGBYTES(cmd, file, cnt) \ 178 if (logging > 1) { \ 179 if (cnt == (off_t)-1) \ 180 syslog(LOG_INFO,"%s %s%s", cmd, \ 181 *(file) == '/' ? "" : curdir(), file); \ 182 else \ 183 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 184 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 185 } 186 187static void ack __P((char *)); 188static void myoob __P((int)); 189static int checkuser __P((char *)); 190static FILE *dataconn __P((char *, off_t, char *)); 191static void dolog __P((struct sockaddr_in *)); 192static char *curdir __P((void)); 193static void end_login __P((void)); 194static FILE *getdatasock __P((char *)); 195static char *gunique __P((char *)); 196static void lostconn __P((int)); 197static int receive_data __P((FILE *, FILE *)); 198static void send_data __P((FILE *, FILE *, off_t, off_t, int)); 199static struct passwd * 200 sgetpwnam __P((char *)); 201static char *sgetsave __P((char *)); 202 203static char * 204curdir() 205{ 206 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 207 208 if (getcwd(path, sizeof(path)-2) == NULL) 209 return (""); 210 if (path[1] != '\0') /* special case for root dir. */ 211 strcat(path, "/"); 212 /* For guest account, skip / since it's chrooted */ 213 return (guest ? path+1 : path); 214} 215 216int 217main(argc, argv, envp) 218 int argc; 219 char *argv[]; 220 char **envp; 221{ 222 int addrlen, ch, on = 1, tos; 223 char *cp, line[LINE_MAX]; 224 FILE *fd; 225 226 tzset(); /* in case no timezone database in ~ftp */ 227 228 /* 229 * LOG_NDELAY sets up the logging connection immediately, 230 * necessary for anonymous ftp's that chroot and can't do it later. 231 */ 232 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 233 addrlen = sizeof(his_addr); 234 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 235 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 236 exit(1); 237 } 238#ifdef SKEY 239 strcpy(addr_string, inet_ntoa(his_addr.sin_addr)); 240#endif 241 addrlen = sizeof(ctrl_addr); 242 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 243 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 244 exit(1); 245 } 246#ifdef IP_TOS 247 tos = IPTOS_LOWDELAY; 248 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 249 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 250#endif 251 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 252 debug = 0; 253#ifdef OLD_SETPROCTITLE 254 /* 255 * Save start and extent of argv for setproctitle. 256 */ 257 Argv = argv; 258 while (*envp) 259 envp++; 260 LastArgv = envp[-1] + strlen(envp[-1]); 261#endif /* OLD_SETPROCTITLE */ 262 263 264#ifdef STATS 265 while ((ch = getopt(argc, argv, "dlSt:T:u:v")) != EOF) { 266#else 267 while ((ch = getopt(argc, argv, "dlUt:T:u:v")) != EOF) { 268#endif 269 switch (ch) { 270 case 'd': 271 debug = 1; 272 break; 273 274 case 'l': 275 logging++; /* > 1 == extra logging */ 276 break; 277 278 case 'U': 279 restricted_data_ports = 0; 280 break; 281 282 case 't': 283 timeout = atoi(optarg); 284 if (maxtimeout < timeout) 285 maxtimeout = timeout; 286 break; 287#ifdef STATS 288 case 'S': 289 stats = 1; 290 break; 291#endif 292 case 'T': 293 maxtimeout = atoi(optarg); 294 if (timeout > maxtimeout) 295 timeout = maxtimeout; 296 break; 297 298 case 'u': 299 { 300 long val = 0; 301 302 val = strtol(optarg, &optarg, 8); 303 if (*optarg != '\0' || val < 0) 304 warnx("bad value for -u"); 305 else 306 defumask = val; 307 break; 308 } 309 310 case 'v': 311 debug = 1; 312 break; 313 314 default: 315 warnx("unknown flag -%c ignored", optopt); 316 break; 317 } 318 } 319 (void) freopen(_PATH_DEVNULL, "w", stderr); 320 (void) signal(SIGPIPE, lostconn); 321 (void) signal(SIGCHLD, SIG_IGN); 322 if ((int)signal(SIGURG, myoob) < 0) 323 syslog(LOG_ERR, "signal: %m"); 324 325 /* Try to handle urgent data inline */ 326#ifdef SO_OOBINLINE 327 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 328 syslog(LOG_ERR, "setsockopt: %m"); 329#endif 330 331#ifdef F_SETOWN 332 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 333 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 334#endif 335 dolog(&his_addr); 336 /* 337 * Set up default state 338 */ 339 data = -1; 340 type = TYPE_A; 341 form = FORM_N; 342 stru = STRU_F; 343 mode = MODE_S; 344 tmpline[0] = '\0'; 345 346 /* If logins are disabled, print out the message. */ 347 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 348 while (fgets(line, sizeof(line), fd) != NULL) { 349 if ((cp = strchr(line, '\n')) != NULL) 350 *cp = '\0'; 351 lreply(530, "%s", line); 352 } 353 (void) fflush(stdout); 354 (void) fclose(fd); 355 reply(530, "System not available."); 356 exit(0); 357 } 358 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 359 while (fgets(line, sizeof(line), fd) != NULL) { 360 if ((cp = strchr(line, '\n')) != NULL) 361 *cp = '\0'; 362 lreply(220, "%s", line); 363 } 364 (void) fflush(stdout); 365 (void) fclose(fd); 366 /* reply(220,) must follow */ 367 } 368 (void) gethostname(hostname, sizeof(hostname)); 369 reply(220, "%s FTP server (%s) ready.", hostname, version); 370 (void) setjmp(errcatch); 371 for (;;) 372 (void) yyparse(); 373 /* NOTREACHED */ 374} 375 376static void 377lostconn(signo) 378 int signo; 379{ 380 381 if (debug) 382 syslog(LOG_DEBUG, "lost connection"); 383 dologout(-1); 384} 385 386static char ttyline[20]; 387 388/* 389 * Helper function for sgetpwnam(). 390 */ 391static char * 392sgetsave(s) 393 char *s; 394{ 395 char *new = malloc((unsigned) strlen(s) + 1); 396 397 if (new == NULL) { 398 perror_reply(421, "Local resource failure: malloc"); 399 dologout(1); 400 /* NOTREACHED */ 401 } 402 (void) strcpy(new, s); 403 return (new); 404} 405 406/* 407 * Save the result of a getpwnam. Used for USER command, since 408 * the data returned must not be clobbered by any other command 409 * (e.g., globbing). 410 */ 411static struct passwd * 412sgetpwnam(name) 413 char *name; 414{ 415 static struct passwd save; 416 struct passwd *p; 417 418 if ((p = getpwnam(name)) == NULL) 419 return (p); 420 if (save.pw_name) { 421 free(save.pw_name); 422 free(save.pw_passwd); 423 free(save.pw_gecos); 424 free(save.pw_dir); 425 free(save.pw_shell); 426 } 427 save = *p; 428 save.pw_name = sgetsave(p->pw_name); 429 save.pw_passwd = sgetsave(p->pw_passwd); 430 save.pw_gecos = sgetsave(p->pw_gecos); 431 save.pw_dir = sgetsave(p->pw_dir); 432 save.pw_shell = sgetsave(p->pw_shell); 433 return (&save); 434} 435 436static int login_attempts; /* number of failed login attempts */ 437static int askpasswd; /* had user command, ask for passwd */ 438static char curname[10]; /* current USER name */ 439 440/* 441 * USER command. 442 * Sets global passwd pointer pw if named account exists and is acceptable; 443 * sets askpasswd if a PASS command is expected. If logged in previously, 444 * need to reset state. If name is "ftp" or "anonymous", the name is not in 445 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 446 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 447 * requesting login privileges. Disallow anyone who does not have a standard 448 * shell as returned by getusershell(). Disallow anyone mentioned in the file 449 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 450 */ 451void 452user(name) 453 char *name; 454{ 455 char *cp, *shell; 456 457 if (logged_in) { 458 if (guest) { 459 reply(530, "Can't change user from guest login."); 460 return; 461 } 462 end_login(); 463 } 464 465 guest = 0; 466 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 467 if (checkuser("ftp") || checkuser("anonymous")) 468 reply(530, "User %s access denied.", name); 469 else if ((pw = sgetpwnam("ftp")) != NULL) { 470 guest = 1; 471 askpasswd = 1; 472 reply(331, 473 "Guest login ok, send your email address as password."); 474 } else 475 reply(530, "User %s unknown.", name); 476 if (!askpasswd && logging) 477 syslog(LOG_NOTICE, 478 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 479 return; 480 } 481 if (pw = sgetpwnam(name)) { 482 if ((shell = pw->pw_shell) == NULL || *shell == 0) 483 shell = _PATH_BSHELL; 484 while ((cp = getusershell()) != NULL) 485 if (strcmp(cp, shell) == 0) 486 break; 487 endusershell(); 488 489 if (cp == NULL || checkuser(name)) { 490 reply(530, "User %s access denied.", name); 491 if (logging) 492 syslog(LOG_NOTICE, 493 "FTP LOGIN REFUSED FROM %s, %s", 494 remotehost, name); 495 pw = (struct passwd *) NULL; 496 return; 497 } 498 } 499 if (logging) 500 strncpy(curname, name, sizeof(curname)-1); 501#ifdef SKEY 502 pwok = skeyaccess(name, NULL, remotehost, addr_string); 503 reply(331, "%s", skey_challenge(name, pw, pwok)); 504#else 505 reply(331, "Password required for %s.", name); 506#endif 507 askpasswd = 1; 508 /* 509 * Delay before reading passwd after first failed 510 * attempt to slow down passwd-guessing programs. 511 */ 512 if (login_attempts) 513 sleep((unsigned) login_attempts); 514} 515 516/* 517 * Check if a user is in the file _PATH_FTPUSERS 518 */ 519static int 520checkuser(name) 521 char *name; 522{ 523 FILE *fd; 524 int found = 0; 525 char *p, line[BUFSIZ]; 526 527 if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { 528 while (fgets(line, sizeof(line), fd) != NULL) 529 if ((p = strchr(line, '\n')) != NULL) { 530 *p = '\0'; 531 if (line[0] == '#') 532 continue; 533 if (strcmp(line, name) == 0) { 534 found = 1; 535 break; 536 } 537 } 538 (void) fclose(fd); 539 } 540 return (found); 541} 542 543/* 544 * Terminate login as previous user, if any, resetting state; 545 * used when USER command is given or login fails. 546 */ 547static void 548end_login() 549{ 550 551 (void) seteuid((uid_t)0); 552 if (logged_in) 553 logwtmp(ttyline, "", ""); 554 pw = NULL; 555 logged_in = 0; 556 guest = 0; 557} 558 559void 560pass(passwd) 561 char *passwd; 562{ 563 char *salt, *xpasswd; 564 FILE *fd; 565 static char homedir[MAXPATHLEN]; 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 salt = "xx"; 575 else 576 salt = pw->pw_passwd; 577#ifdef SKEY 578 xpasswd = skey_crypt(passwd, salt, pw, pwok); 579 pwok = 0; 580#else 581 xpasswd = crypt(passwd, salt); 582#endif 583 /* The strcmp does not catch null passwords! */ 584 if (pw == NULL || *pw->pw_passwd == '\0' || 585 (pw->pw_expire && time(NULL) >= pw->pw_expire) || 586 strcmp(xpasswd, pw->pw_passwd)) { 587 reply(530, "Login incorrect."); 588 if (logging) 589 syslog(LOG_NOTICE, 590 "FTP LOGIN FAILED FROM %s, %s", 591 remotehost, curname); 592 pw = NULL; 593 if (login_attempts++ >= 5) { 594 syslog(LOG_NOTICE, 595 "repeated login failures from %s", 596 remotehost); 597 exit(0); 598 } 599 return; 600 } 601 } 602 login_attempts = 0; /* this time successful */ 603 if (setegid((gid_t)pw->pw_gid) < 0) { 604 reply(550, "Can't set gid."); 605 return; 606 } 607 (void) initgroups(pw->pw_name, pw->pw_gid); 608 609 /* open wtmp before chroot */ 610 (void)sprintf(ttyline, "ftp%d", getpid()); 611 logwtmp(ttyline, pw->pw_name, remotehost); 612 logged_in = 1; 613 614#ifdef STATS 615 if (guest && stats == 1 && statfd < 0) 616 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 617 stats = 0; 618#endif 619 620 if (guest) { 621 /* 622 * We MUST do a chdir() after the chroot. Otherwise 623 * the old current directory will be accessible as "." 624 * outside the new root! 625 */ 626 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 627 reply(550, "Can't set guest privileges."); 628 goto bad; 629 } 630 } else if (chdir(pw->pw_dir) < 0) { 631 if (chdir("/") < 0) { 632 reply(530, "User %s: can't change directory to %s.", 633 pw->pw_name, pw->pw_dir); 634 goto bad; 635 } else 636 lreply(230, "No directory! Logging in with home=/"); 637 } 638 if (seteuid((uid_t)pw->pw_uid) < 0) { 639 reply(550, "Can't set uid."); 640 goto bad; 641 } 642 643 /* 644 * Set home directory so that use of ~ (tilde) works correctly. 645 */ 646 if (getcwd(homedir, MAXPATHLEN) != NULL) 647 setenv("HOME", homedir, 1); 648 649 /* 650 * Display a login message, if it exists. 651 * N.B. reply(230,) must follow the message. 652 */ 653 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 654 char *cp, line[LINE_MAX]; 655 656 while (fgets(line, sizeof(line), fd) != NULL) { 657 if ((cp = strchr(line, '\n')) != NULL) 658 *cp = '\0'; 659 lreply(230, "%s", line); 660 } 661 (void) fflush(stdout); 662 (void) fclose(fd); 663 } 664 if (guest) { 665#ifdef STATS 666 char * copy(); 667 668 if (ident != NULL) 669 free(ident); 670 ident = (char *) copy(passwd); 671#endif 672 reply(230, "Guest login ok, access restrictions apply."); 673#ifdef SETPROCTITLE 674 snprintf(proctitle, sizeof(proctitle), 675 "%s: anonymous/%.*s", remotehost, 676 sizeof(proctitle) - sizeof(remotehost) - 677 sizeof(": anonymous/"), passwd); 678 setproctitle("%s", proctitle); 679#endif /* SETPROCTITLE */ 680 if (logging) 681 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 682 remotehost, passwd); 683 } else { 684 reply(230, "User %s logged in.", pw->pw_name); 685#ifdef SETPROCTITLE 686 snprintf(proctitle, sizeof(proctitle), 687 "%s: %s", remotehost, pw->pw_name); 688 setproctitle("%s", proctitle); 689#endif /* SETPROCTITLE */ 690 if (logging) 691 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 692 remotehost, pw->pw_name); 693 } 694 (void) umask(defumask); 695 return; 696bad: 697 /* Forget all about it... */ 698 end_login(); 699} 700 701void 702retrieve(cmd, name) 703 char *cmd, *name; 704{ 705 FILE *fin, *dout; 706 struct stat st; 707 int (*closefunc) __P((FILE *)); 708#ifdef STATS 709 long start; 710#endif 711 712 if (cmd == 0) { 713 fin = fopen(name, "r"), closefunc = fclose; 714 st.st_size = 0; 715 } else { 716 char line[BUFSIZ]; 717 718 (void) sprintf(line, cmd, name), name = line; 719 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 720 st.st_size = -1; 721 st.st_blksize = BUFSIZ; 722 } 723 if (fin == NULL) { 724 if (errno != 0) { 725 perror_reply(550, name); 726 if (cmd == 0) { 727 LOGCMD("get", name); 728 } 729 } 730 return; 731 } 732 byte_count = -1; 733 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 734 reply(550, "%s: not a plain file.", name); 735 goto done; 736 } 737 if (restart_point) { 738 if (type == TYPE_A) { 739 off_t i, n; 740 int c; 741 742 n = restart_point; 743 i = 0; 744 while (i++ < n) { 745 if ((c=getc(fin)) == EOF) { 746 perror_reply(550, name); 747 goto done; 748 } 749 if (c == '\n') 750 i++; 751 } 752 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 753 perror_reply(550, name); 754 goto done; 755 } 756 } 757 dout = dataconn(name, st.st_size, "w"); 758 if (dout == NULL) 759 goto done; 760#ifdef STATS 761 time(&start); 762#endif 763 send_data(fin, dout, st.st_blksize, st.st_size, 764 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 765#ifdef STATS 766 if (cmd == 0 && guest && stats) 767 logxfer( name, st.st_size, start); 768#endif 769 (void) fclose(dout); 770 data = -1; 771 pdata = -1; 772done: 773 if (cmd == 0) 774 LOGBYTES("get", name, byte_count); 775 (*closefunc)(fin); 776} 777 778void 779store(name, mode, unique) 780 char *name, *mode; 781 int unique; 782{ 783 FILE *fout, *din; 784 struct stat st; 785 int (*closefunc) __P((FILE *)); 786 787 if (unique && stat(name, &st) == 0 && 788 (name = gunique(name)) == NULL) { 789 LOGCMD(*mode == 'w' ? "put" : "append", name); 790 return; 791 } 792 793 if (restart_point) 794 mode = "r+"; 795 fout = fopen(name, mode); 796 closefunc = fclose; 797 if (fout == NULL) { 798 perror_reply(553, name); 799 LOGCMD(*mode == 'w' ? "put" : "append", name); 800 return; 801 } 802 byte_count = -1; 803 if (restart_point) { 804 if (type == TYPE_A) { 805 off_t i, n; 806 int c; 807 808 n = restart_point; 809 i = 0; 810 while (i++ < n) { 811 if ((c=getc(fout)) == EOF) { 812 perror_reply(550, name); 813 goto done; 814 } 815 if (c == '\n') 816 i++; 817 } 818 /* 819 * We must do this seek to "current" position 820 * because we are changing from reading to 821 * writing. 822 */ 823 if (fseek(fout, 0L, L_INCR) < 0) { 824 perror_reply(550, name); 825 goto done; 826 } 827 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 828 perror_reply(550, name); 829 goto done; 830 } 831 } 832 din = dataconn(name, (off_t)-1, "r"); 833 if (din == NULL) 834 goto done; 835 if (receive_data(din, fout) == 0) { 836 if (unique) 837 reply(226, "Transfer complete (unique file name:%s).", 838 name); 839 else 840 reply(226, "Transfer complete."); 841 } 842 (void) fclose(din); 843 data = -1; 844 pdata = -1; 845done: 846 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 847 (*closefunc)(fout); 848} 849 850static FILE * 851getdatasock(mode) 852 char *mode; 853{ 854 int on = 1, s, t, tries; 855 856 if (data >= 0) 857 return (fdopen(data, mode)); 858 (void) seteuid((uid_t)0); 859 s = socket(AF_INET, SOCK_STREAM, 0); 860 if (s < 0) 861 goto bad; 862 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 863 (char *) &on, sizeof(on)) < 0) 864 goto bad; 865 /* anchor socket to avoid multi-homing problems */ 866 data_source.sin_family = AF_INET; 867 data_source.sin_addr = ctrl_addr.sin_addr; 868 for (tries = 1; ; tries++) { 869 if (bind(s, (struct sockaddr *)&data_source, 870 sizeof(data_source)) >= 0) 871 break; 872 if (errno != EADDRINUSE || tries > 10) 873 goto bad; 874 sleep(tries); 875 } 876 (void) seteuid((uid_t)pw->pw_uid); 877#ifdef IP_TOS 878 on = IPTOS_THROUGHPUT; 879 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 880 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 881#endif 882#ifdef TCP_NOPUSH 883 /* 884 * Turn off push flag to keep sender TCP from sending short packets 885 * at the boundaries of each write(). Should probably do a SO_SNDBUF 886 * to set the send buffer size as well, but that may not be desirable 887 * in heavy-load situations. 888 */ 889 on = 1; 890 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) 891 syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); 892#endif 893#ifdef SO_SNDBUF 894 on = 65536; 895 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) 896 syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); 897#endif 898 899 return (fdopen(s, mode)); 900bad: 901 /* Return the real value of errno (close may change it) */ 902 t = errno; 903 (void) seteuid((uid_t)pw->pw_uid); 904 (void) close(s); 905 errno = t; 906 return (NULL); 907} 908 909static FILE * 910dataconn(name, size, mode) 911 char *name; 912 off_t size; 913 char *mode; 914{ 915 char sizebuf[32]; 916 FILE *file; 917 int retry = 0, tos; 918 919 file_size = size; 920 byte_count = 0; 921 if (size != (off_t) -1) 922 (void) sprintf(sizebuf, " (%qd bytes)", size); 923 else 924 (void) strcpy(sizebuf, ""); 925 if (pdata >= 0) { 926 struct sockaddr_in from; 927 int s, fromlen = sizeof(from); 928 struct timeval timeout; 929 fd_set set; 930 931 FD_ZERO(&set); 932 FD_SET(pdata, &set); 933 934 timeout.tv_usec = 0; 935 timeout.tv_sec = 120; 936 937 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) == 0 || 938 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) { 939 reply(425, "Can't open data connection."); 940 (void) close(pdata); 941 pdata = -1; 942 return (NULL); 943 } 944 (void) close(pdata); 945 pdata = s; 946#ifdef IP_TOS 947 tos = IPTOS_LOWDELAY; 948 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 949 sizeof(int)); 950#endif 951 reply(150, "Opening %s mode data connection for '%s'%s.", 952 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 953 return (fdopen(pdata, mode)); 954 } 955 if (data >= 0) { 956 reply(125, "Using existing data connection for '%s'%s.", 957 name, sizebuf); 958 usedefault = 1; 959 return (fdopen(data, mode)); 960 } 961 if (usedefault) 962 data_dest = his_addr; 963 usedefault = 1; 964 file = getdatasock(mode); 965 if (file == NULL) { 966 reply(425, "Can't create data socket (%s,%d): %s.", 967 inet_ntoa(data_source.sin_addr), 968 ntohs(data_source.sin_port), strerror(errno)); 969 return (NULL); 970 } 971 data = fileno(file); 972 while (connect(data, (struct sockaddr *)&data_dest, 973 sizeof(data_dest)) < 0) { 974 if (errno == EADDRINUSE && retry < swaitmax) { 975 sleep((unsigned) swaitint); 976 retry += swaitint; 977 continue; 978 } 979 perror_reply(425, "Can't build data connection"); 980 (void) fclose(file); 981 data = -1; 982 return (NULL); 983 } 984 reply(150, "Opening %s mode data connection for '%s'%s.", 985 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 986 return (file); 987} 988 989/* 990 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 991 * encapsulation of the data subject to Mode, Structure, and Type. 992 * 993 * NB: Form isn't handled. 994 */ 995static void 996send_data(instr, outstr, blksize, filesize, isreg) 997 FILE *instr, *outstr; 998 off_t blksize; 999 off_t filesize; 1000 int isreg; 1001{ 1002 int c, cnt, filefd, netfd; 1003 char *buf, *bp; 1004 size_t len; 1005 1006 transflag++; 1007 if (setjmp(urgcatch)) { 1008 transflag = 0; 1009 return; 1010 } 1011 switch (type) { 1012 1013 case TYPE_A: 1014 while ((c = getc(instr)) != EOF) { 1015 byte_count++; 1016 if (c == '\n') { 1017 if (ferror(outstr)) 1018 goto data_err; 1019 (void) putc('\r', outstr); 1020 } 1021 (void) putc(c, outstr); 1022 } 1023 fflush(outstr); 1024 transflag = 0; 1025 if (ferror(instr)) 1026 goto file_err; 1027 if (ferror(outstr)) 1028 goto data_err; 1029 reply(226, "Transfer complete."); 1030 return; 1031 1032 case TYPE_I: 1033 case TYPE_L: 1034 /* 1035 * isreg is only set if we are not doing restart and we 1036 * are sending a regular file 1037 */ 1038 netfd = fileno(outstr); 1039 filefd = fileno(instr); 1040 1041 if (isreg && filesize < (off_t)16 * 1024 * 1024) { 1042 buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, 1043 (off_t)0); 1044 if (!buf) { 1045 syslog(LOG_WARNING, "mmap(%lu): %m", 1046 (unsigned long)filesize); 1047 goto oldway; 1048 } 1049 bp = buf; 1050 len = filesize; 1051 do { 1052 cnt = write(netfd, bp, len); 1053 len -= cnt; 1054 bp += cnt; 1055 if (cnt > 0) byte_count += cnt; 1056 } while(cnt > 0 && len > 0); 1057 1058 transflag = 0; 1059 munmap(buf, (size_t)filesize); 1060 if (cnt < 0) 1061 goto data_err; 1062 reply(226, "Transfer complete."); 1063 return; 1064 } 1065 1066oldway: 1067 if ((buf = malloc((u_int)blksize)) == NULL) { 1068 transflag = 0; 1069 perror_reply(451, "Local resource failure: malloc"); 1070 return; 1071 } 1072 1073 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1074 write(netfd, buf, cnt) == cnt) 1075 byte_count += cnt; 1076 transflag = 0; 1077 (void)free(buf); 1078 if (cnt != 0) { 1079 if (cnt < 0) 1080 goto file_err; 1081 goto data_err; 1082 } 1083 reply(226, "Transfer complete."); 1084 return; 1085 default: 1086 transflag = 0; 1087 reply(550, "Unimplemented TYPE %d in send_data", type); 1088 return; 1089 } 1090 1091data_err: 1092 transflag = 0; 1093 perror_reply(426, "Data connection"); 1094 return; 1095 1096file_err: 1097 transflag = 0; 1098 perror_reply(551, "Error on input file"); 1099} 1100 1101/* 1102 * Transfer data from peer to "outstr" using the appropriate encapulation of 1103 * the data subject to Mode, Structure, and Type. 1104 * 1105 * N.B.: Form isn't handled. 1106 */ 1107static int 1108receive_data(instr, outstr) 1109 FILE *instr, *outstr; 1110{ 1111 int c; 1112 int cnt, bare_lfs = 0; 1113 char buf[BUFSIZ]; 1114 1115 transflag++; 1116 if (setjmp(urgcatch)) { 1117 transflag = 0; 1118 return (-1); 1119 } 1120 switch (type) { 1121 1122 case TYPE_I: 1123 case TYPE_L: 1124 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1125 if (write(fileno(outstr), buf, cnt) != cnt) 1126 goto file_err; 1127 byte_count += cnt; 1128 } 1129 if (cnt < 0) 1130 goto data_err; 1131 transflag = 0; 1132 return (0); 1133 1134 case TYPE_E: 1135 reply(553, "TYPE E not implemented."); 1136 transflag = 0; 1137 return (-1); 1138 1139 case TYPE_A: 1140 while ((c = getc(instr)) != EOF) { 1141 byte_count++; 1142 if (c == '\n') 1143 bare_lfs++; 1144 while (c == '\r') { 1145 if (ferror(outstr)) 1146 goto data_err; 1147 if ((c = getc(instr)) != '\n') { 1148 (void) putc ('\r', outstr); 1149 if (c == '\0' || c == EOF) 1150 goto contin2; 1151 } 1152 } 1153 (void) putc(c, outstr); 1154 contin2: ; 1155 } 1156 fflush(outstr); 1157 if (ferror(instr)) 1158 goto data_err; 1159 if (ferror(outstr)) 1160 goto file_err; 1161 transflag = 0; 1162 if (bare_lfs) { 1163 lreply(226, 1164 "WARNING! %d bare linefeeds received in ASCII mode", 1165 bare_lfs); 1166 (void)printf(" File may not have transferred correctly.\r\n"); 1167 } 1168 return (0); 1169 default: 1170 reply(550, "Unimplemented TYPE %d in receive_data", type); 1171 transflag = 0; 1172 return (-1); 1173 } 1174 1175data_err: 1176 transflag = 0; 1177 perror_reply(426, "Data Connection"); 1178 return (-1); 1179 1180file_err: 1181 transflag = 0; 1182 perror_reply(452, "Error writing file"); 1183 return (-1); 1184} 1185 1186void 1187statfilecmd(filename) 1188 char *filename; 1189{ 1190 FILE *fin; 1191 int c; 1192 char line[LINE_MAX]; 1193 1194 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1195 fin = ftpd_popen(line, "r"); 1196 lreply(211, "status of %s:", filename); 1197 while ((c = getc(fin)) != EOF) { 1198 if (c == '\n') { 1199 if (ferror(stdout)){ 1200 perror_reply(421, "control connection"); 1201 (void) ftpd_pclose(fin); 1202 dologout(1); 1203 /* NOTREACHED */ 1204 } 1205 if (ferror(fin)) { 1206 perror_reply(551, filename); 1207 (void) ftpd_pclose(fin); 1208 return; 1209 } 1210 (void) putc('\r', stdout); 1211 } 1212 (void) putc(c, stdout); 1213 } 1214 (void) ftpd_pclose(fin); 1215 reply(211, "End of Status"); 1216} 1217 1218void 1219statcmd() 1220{ 1221 struct sockaddr_in *sin; 1222 u_char *a, *p; 1223 1224 lreply(211, "%s FTP server status:", hostname, version); 1225 printf(" %s\r\n", version); 1226 printf(" Connected to %s", remotehost); 1227 if (!isdigit(remotehost[0])) 1228 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1229 printf("\r\n"); 1230 if (logged_in) { 1231 if (guest) 1232 printf(" Logged in anonymously\r\n"); 1233 else 1234 printf(" Logged in as %s\r\n", pw->pw_name); 1235 } else if (askpasswd) 1236 printf(" Waiting for password\r\n"); 1237 else 1238 printf(" Waiting for user name\r\n"); 1239 printf(" TYPE: %s", typenames[type]); 1240 if (type == TYPE_A || type == TYPE_E) 1241 printf(", FORM: %s", formnames[form]); 1242 if (type == TYPE_L) 1243#if NBBY == 8 1244 printf(" %d", NBBY); 1245#else 1246 printf(" %d", bytesize); /* need definition! */ 1247#endif 1248 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1249 strunames[stru], modenames[mode]); 1250 if (data != -1) 1251 printf(" Data connection open\r\n"); 1252 else if (pdata != -1) { 1253 printf(" in Passive mode"); 1254 sin = &pasv_addr; 1255 goto printaddr; 1256 } else if (usedefault == 0) { 1257 printf(" PORT"); 1258 sin = &data_dest; 1259printaddr: 1260 a = (u_char *) &sin->sin_addr; 1261 p = (u_char *) &sin->sin_port; 1262#define UC(b) (((int) b) & 0xff) 1263 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1264 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1265#undef UC 1266 } else 1267 printf(" No data connection\r\n"); 1268 reply(211, "End of status"); 1269} 1270 1271void 1272fatal(s) 1273 char *s; 1274{ 1275 1276 reply(451, "Error in server: %s\n", s); 1277 reply(221, "Closing connection due to server error."); 1278 dologout(0); 1279 /* NOTREACHED */ 1280} 1281 1282void 1283#if __STDC__ 1284reply(int n, const char *fmt, ...) 1285#else 1286reply(n, fmt, va_alist) 1287 int n; 1288 char *fmt; 1289 va_dcl 1290#endif 1291{ 1292 va_list ap; 1293#if __STDC__ 1294 va_start(ap, fmt); 1295#else 1296 va_start(ap); 1297#endif 1298 (void)printf("%d ", n); 1299 (void)vprintf(fmt, ap); 1300 (void)printf("\r\n"); 1301 (void)fflush(stdout); 1302 if (debug) { 1303 syslog(LOG_DEBUG, "<--- %d ", n); 1304 vsyslog(LOG_DEBUG, fmt, ap); 1305 } 1306} 1307 1308void 1309#if __STDC__ 1310lreply(int n, const char *fmt, ...) 1311#else 1312lreply(n, fmt, va_alist) 1313 int n; 1314 char *fmt; 1315 va_dcl 1316#endif 1317{ 1318 va_list ap; 1319#if __STDC__ 1320 va_start(ap, fmt); 1321#else 1322 va_start(ap); 1323#endif 1324 (void)printf("%d- ", n); 1325 (void)vprintf(fmt, ap); 1326 (void)printf("\r\n"); 1327 (void)fflush(stdout); 1328 if (debug) { 1329 syslog(LOG_DEBUG, "<--- %d- ", n); 1330 vsyslog(LOG_DEBUG, fmt, ap); 1331 } 1332} 1333 1334static void 1335ack(s) 1336 char *s; 1337{ 1338 1339 reply(250, "%s command successful.", s); 1340} 1341 1342void 1343nack(s) 1344 char *s; 1345{ 1346 1347 reply(502, "%s command not implemented.", s); 1348} 1349 1350/* ARGSUSED */ 1351void 1352yyerror(s) 1353 char *s; 1354{ 1355 char *cp; 1356 1357 if (cp = strchr(cbuf,'\n')) 1358 *cp = '\0'; 1359 reply(500, "'%s': command not understood.", cbuf); 1360} 1361 1362void 1363delete(name) 1364 char *name; 1365{ 1366 struct stat st; 1367 1368 LOGCMD("delete", name); 1369 if (stat(name, &st) < 0) { 1370 perror_reply(550, name); 1371 return; 1372 } 1373 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1374 if (rmdir(name) < 0) { 1375 perror_reply(550, name); 1376 return; 1377 } 1378 goto done; 1379 } 1380 if (unlink(name) < 0) { 1381 perror_reply(550, name); 1382 return; 1383 } 1384done: 1385 ack("DELE"); 1386} 1387 1388void 1389cwd(path) 1390 char *path; 1391{ 1392 1393 if (chdir(path) < 0) 1394 perror_reply(550, path); 1395 else 1396 ack("CWD"); 1397} 1398 1399void 1400makedir(name) 1401 char *name; 1402{ 1403 1404 LOGCMD("mkdir", name); 1405 if (mkdir(name, 0777) < 0) 1406 perror_reply(550, name); 1407 else 1408 reply(257, "MKD command successful."); 1409} 1410 1411void 1412removedir(name) 1413 char *name; 1414{ 1415 1416 LOGCMD("rmdir", name); 1417 if (rmdir(name) < 0) 1418 perror_reply(550, name); 1419 else 1420 ack("RMD"); 1421} 1422 1423void 1424pwd() 1425{ 1426 char path[MAXPATHLEN + 1]; 1427 1428 if (getwd(path) == (char *)NULL) 1429 reply(550, "%s.", path); 1430 else 1431 reply(257, "\"%s\" is current directory.", path); 1432} 1433 1434char * 1435renamefrom(name) 1436 char *name; 1437{ 1438 struct stat st; 1439 1440 if (stat(name, &st) < 0) { 1441 perror_reply(550, name); 1442 return ((char *)0); 1443 } 1444 reply(350, "File exists, ready for destination name"); 1445 return (name); 1446} 1447 1448void 1449renamecmd(from, to) 1450 char *from, *to; 1451{ 1452 1453 LOGCMD2("rename", from, to); 1454 if (rename(from, to) < 0) 1455 perror_reply(550, "rename"); 1456 else 1457 ack("RNTO"); 1458} 1459 1460static void 1461dolog(sin) 1462 struct sockaddr_in *sin; 1463{ 1464 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1465 sizeof(struct in_addr), AF_INET); 1466 1467 if (hp) 1468 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1469 else 1470 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1471 sizeof(remotehost)); 1472#ifdef SETPROCTITLE 1473 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1474 setproctitle("%s", proctitle); 1475#endif /* SETPROCTITLE */ 1476 1477 if (logging) 1478 syslog(LOG_INFO, "connection from %s", remotehost); 1479} 1480 1481/* 1482 * Record logout in wtmp file 1483 * and exit with supplied status. 1484 */ 1485void 1486dologout(status) 1487 int status; 1488{ 1489 1490 if (logged_in) { 1491 (void) seteuid((uid_t)0); 1492 logwtmp(ttyline, "", ""); 1493 } 1494 /* beware of flushing buffers after a SIGPIPE */ 1495 _exit(status); 1496} 1497 1498static void 1499myoob(signo) 1500 int signo; 1501{ 1502 char *cp; 1503 1504 /* only process if transfer occurring */ 1505 if (!transflag) 1506 return; 1507 cp = tmpline; 1508 if (getline(cp, 7, stdin) == NULL) { 1509 reply(221, "You could at least say goodbye."); 1510 dologout(0); 1511 } 1512 upper(cp); 1513 if (strcmp(cp, "ABOR\r\n") == 0) { 1514 tmpline[0] = '\0'; 1515 reply(426, "Transfer aborted. Data connection closed."); 1516 reply(226, "Abort successful"); 1517 longjmp(urgcatch, 1); 1518 } 1519 if (strcmp(cp, "STAT\r\n") == 0) { 1520 if (file_size != (off_t) -1) 1521 reply(213, "Status: %qd of %qd bytes transferred", 1522 byte_count, file_size); 1523 else 1524 reply(213, "Status: %qd bytes transferred", byte_count); 1525 } 1526} 1527 1528/* 1529 * Note: a response of 425 is not mentioned as a possible response to 1530 * the PASV command in RFC959. However, it has been blessed as 1531 * a legitimate response by Jon Postel in a telephone conversation 1532 * with Rick Adams on 25 Jan 89. 1533 */ 1534void 1535passive() 1536{ 1537 int len; 1538 u_short port; 1539 char *p, *a; 1540 1541 pdata = socket(AF_INET, SOCK_STREAM, 0); 1542 if (pdata < 0) { 1543 perror_reply(425, "Can't open passive connection"); 1544 return; 1545 } 1546 1547 if (restricted_data_ports) { 1548 for (port = FTP_DATA_BOTTOM; port <= FTP_DATA_TOP; port++) { 1549 pasv_addr = ctrl_addr; 1550 pasv_addr.sin_port = htons(port); 1551 (void) seteuid((uid_t)0); 1552 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1553 sizeof(pasv_addr)) < 0) { 1554 (void) seteuid((uid_t)pw->pw_uid); 1555 if (errno == EADDRINUSE) 1556 continue; 1557 else 1558 goto pasv_error; 1559 } 1560 (void) seteuid((uid_t)pw->pw_uid); 1561 break; 1562 } 1563 if (port > FTP_DATA_TOP) 1564 goto pasv_error; 1565 } else { 1566 pasv_addr = ctrl_addr; 1567 pasv_addr.sin_port = 0; 1568 (void) seteuid((uid_t)0); 1569 if (bind(pdata, (struct sockaddr *)&pasv_addr, 1570 sizeof(pasv_addr)) < 0) { 1571 (void) seteuid((uid_t)pw->pw_uid); 1572 goto pasv_error; 1573 } 1574 (void) seteuid((uid_t)pw->pw_uid); 1575 } 1576 1577 len = sizeof(pasv_addr); 1578 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1579 goto pasv_error; 1580 if (listen(pdata, 1) < 0) 1581 goto pasv_error; 1582 a = (char *) &pasv_addr.sin_addr; 1583 p = (char *) &pasv_addr.sin_port; 1584 1585#define UC(b) (((int) b) & 0xff) 1586 1587 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1588 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1589 return; 1590 1591pasv_error: 1592 (void) close(pdata); 1593 pdata = -1; 1594 perror_reply(425, "Can't open passive connection"); 1595 return; 1596} 1597 1598/* 1599 * Generate unique name for file with basename "local". 1600 * The file named "local" is already known to exist. 1601 * Generates failure reply on error. 1602 */ 1603static char * 1604gunique(local) 1605 char *local; 1606{ 1607 static char new[MAXPATHLEN]; 1608 struct stat st; 1609 int count; 1610 char *cp; 1611 1612 cp = strrchr(local, '/'); 1613 if (cp) 1614 *cp = '\0'; 1615 if (stat(cp ? local : ".", &st) < 0) { 1616 perror_reply(553, cp ? local : "."); 1617 return ((char *) 0); 1618 } 1619 if (cp) 1620 *cp = '/'; 1621 (void) strcpy(new, local); 1622 cp = new + strlen(new); 1623 *cp++ = '.'; 1624 for (count = 1; count < 100; count++) { 1625 (void)sprintf(cp, "%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 */ 1636void 1637perror_reply(code, string) 1638 int code; 1639 char *string; 1640{ 1641 1642 reply(code, "%s: %s.", string, strerror(errno)); 1643} 1644 1645static char *onefile[] = { 1646 "", 1647 0 1648}; 1649 1650void 1651send_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 1663 if (strpbrk(whichf, "~{[*?") != NULL) { 1664 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1665 1666 memset(&gl, 0, sizeof(gl)); 1667 freeglob = 1; 1668 if (glob(whichf, flags, 0, &gl)) { 1669 reply(550, "not found"); 1670 goto out; 1671 } else if (gl.gl_pathc == 0) { 1672 errno = ENOENT; 1673 perror_reply(550, whichf); 1674 goto out; 1675 } 1676 dirlist = gl.gl_pathv; 1677 } else { 1678 onefile[0] = whichf; 1679 dirlist = onefile; 1680 simple = 1; 1681 } 1682 1683 if (setjmp(urgcatch)) { 1684 transflag = 0; 1685 goto out; 1686 } 1687 while (dirname = *dirlist++) { 1688 if (stat(dirname, &st) < 0) { 1689 /* 1690 * If user typed "ls -l", etc, and the client 1691 * used NLST, do what the user meant. 1692 */ 1693 if (dirname[0] == '-' && *dirlist == NULL && 1694 transflag == 0) { 1695 retrieve("/bin/ls %s", dirname); 1696 goto out; 1697 } 1698 perror_reply(550, whichf); 1699 if (dout != NULL) { 1700 (void) fclose(dout); 1701 transflag = 0; 1702 data = -1; 1703 pdata = -1; 1704 } 1705 goto out; 1706 } 1707 1708 if (S_ISREG(st.st_mode)) { 1709 if (dout == NULL) { 1710 dout = dataconn("file list", (off_t)-1, "w"); 1711 if (dout == NULL) 1712 goto out; 1713 transflag++; 1714 } 1715 fprintf(dout, "%s%s\n", dirname, 1716 type == TYPE_A ? "\r" : ""); 1717 byte_count += strlen(dirname) + 1; 1718 continue; 1719 } else if (!S_ISDIR(st.st_mode)) 1720 continue; 1721 1722 if ((dirp = opendir(dirname)) == NULL) 1723 continue; 1724 1725 while ((dir = readdir(dirp)) != NULL) { 1726 char nbuf[MAXPATHLEN]; 1727 1728 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1729 continue; 1730 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1731 dir->d_namlen == 2) 1732 continue; 1733 1734 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1735 1736 /* 1737 * We have to do a stat to insure it's 1738 * not a directory or special file. 1739 */ 1740 if (simple || (stat(nbuf, &st) == 0 && 1741 S_ISREG(st.st_mode))) { 1742 if (dout == NULL) { 1743 dout = dataconn("file list", (off_t)-1, 1744 "w"); 1745 if (dout == NULL) 1746 goto out; 1747 transflag++; 1748 } 1749 if (nbuf[0] == '.' && nbuf[1] == '/') 1750 fprintf(dout, "%s%s\n", &nbuf[2], 1751 type == TYPE_A ? "\r" : ""); 1752 else 1753 fprintf(dout, "%s%s\n", nbuf, 1754 type == TYPE_A ? "\r" : ""); 1755 byte_count += strlen(nbuf) + 1; 1756 } 1757 } 1758 (void) closedir(dirp); 1759 } 1760 1761 if (dout == NULL) 1762 reply(550, "No files found."); 1763 else if (ferror(dout) != 0) 1764 perror_reply(550, "Data connection"); 1765 else 1766 reply(226, "Transfer complete."); 1767 1768 transflag = 0; 1769 if (dout != NULL) 1770 (void) fclose(dout); 1771 data = -1; 1772 pdata = -1; 1773out: 1774 if (freeglob) { 1775 freeglob = 0; 1776 globfree(&gl); 1777 } 1778} 1779 1780#ifdef OLD_SETPROCTITLE 1781/* 1782 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 1783 * Warning, since this is usually started from inetd.conf, it often doesn't 1784 * have much of an environment or arglist to overwrite. 1785 */ 1786void 1787#if __STDC__ 1788setproctitle(const char *fmt, ...) 1789#else 1790setproctitle(fmt, va_alist) 1791 char *fmt; 1792 va_dcl 1793#endif 1794{ 1795 int i; 1796 va_list ap; 1797 char *p, *bp, ch; 1798 char buf[LINE_MAX]; 1799 1800#if __STDC__ 1801 va_start(ap, fmt); 1802#else 1803 va_start(ap); 1804#endif 1805 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 1806 1807 /* make ps print our process name */ 1808 p = Argv[0]; 1809 *p++ = '-'; 1810 1811 i = strlen(buf); 1812 if (i > LastArgv - p - 2) { 1813 i = LastArgv - p - 2; 1814 buf[i] = '\0'; 1815 } 1816 bp = buf; 1817 while (ch = *bp++) 1818 if (ch != '\n' && ch != '\r') 1819 *p++ = ch; 1820 while (p < LastArgv) 1821 *p++ = ' '; 1822} 1823#endif /* OLD_SETPROCTITLE */ 1824 1825#ifdef STATS 1826logxfer(name, size, start) 1827 char *name; 1828 long size; 1829 long start; 1830{ 1831 char buf[1024]; 1832 char path[MAXPATHLEN + 1]; 1833 long now; 1834 1835 if (statfd >= 0 && getwd(path) != NULL) { 1836 time(&now); 1837 sprintf(buf, "%.20s!%s!%s!%s/%s!%ld!%ld\n", 1838 ctime(&now)+4, ident, remotehost, 1839 path, name, size, now - start + (now == start)); 1840 write(statfd, buf, strlen(buf)); 1841 } 1842} 1843 1844char * 1845copy(s) 1846 char *s; 1847{ 1848 char *p; 1849 1850 p = malloc((unsigned) strlen(s) + 1); 1851 if (p == NULL) 1852 fatal("Ran out of memory."); 1853 (void) strcpy(p, s); 1854 return (p); 1855} 1856#endif 1857