ftpd.c revision 1.19
1 /* $NetBSD: ftpd.c,v 1.19 1997/04/06 07:53:11 cjs Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #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 #if 0 44 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 45 #else 46 static char rcsid[] = "$NetBSD: ftpd.c,v 1.19 1997/04/06 07:53:11 cjs Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * FTP server. 52 */ 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 #include <sys/ioctl.h> 56 #include <sys/socket.h> 57 #include <sys/wait.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 63 #define FTP_NAMES 64 #include <arpa/ftp.h> 65 #include <arpa/inet.h> 66 #include <arpa/telnet.h> 67 68 #include <ctype.h> 69 #include <dirent.h> 70 #include <err.h> 71 #include <errno.h> 72 #include <fcntl.h> 73 #include <glob.h> 74 #include <limits.h> 75 #include <netdb.h> 76 #include <pwd.h> 77 #include <setjmp.h> 78 #include <signal.h> 79 #include <stdio.h> 80 #include <stdlib.h> 81 #include <string.h> 82 #include <syslog.h> 83 #include <time.h> 84 #include <unistd.h> 85 86 #include "pathnames.h" 87 #include "extern.h" 88 89 #if __STDC__ 90 #include <stdarg.h> 91 #else 92 #include <varargs.h> 93 #endif 94 95 static char version[] = "Version 6.00"; 96 97 extern off_t restart_point; 98 extern char cbuf[]; 99 100 struct sockaddr_in ctrl_addr; 101 struct sockaddr_in data_source; 102 struct sockaddr_in data_dest; 103 struct sockaddr_in his_addr; 104 struct sockaddr_in pasv_addr; 105 106 int data; 107 jmp_buf errcatch, urgcatch; 108 int logged_in; 109 struct passwd *pw; 110 int debug; 111 int timeout = 900; /* timeout after 15 minutes of inactivity */ 112 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 113 int logging; 114 int guest; 115 int dochroot; 116 int type; 117 int form; 118 int stru; /* avoid C keyword */ 119 int mode; 120 int usedefault = 1; /* for data transfers */ 121 int pdata = -1; /* for passive mode */ 122 sig_atomic_t transflag; 123 off_t file_size; 124 off_t byte_count; 125 #if !defined(CMASK) || CMASK == 0 126 #undef CMASK 127 #define CMASK 027 128 #endif 129 #if !defined(GUEST_CMASK) 130 #define GUEST_CMASK 0707 131 #endif 132 int defumask = CMASK; /* default umask value */ 133 char tmpline[7]; 134 char hostname[MAXHOSTNAMELEN]; 135 char remotehost[MAXHOSTNAMELEN]; 136 static char ttyline[20]; 137 char *tty = ttyline; /* for klogin */ 138 139 #if defined(KERBEROS) 140 int notickets = 1; 141 char *krbtkfile_env = 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 */ 151 152 int swaitmax = SWAITMAX; 153 int swaitint = SWAITINT; 154 155 #ifdef HASSETPROCTITLE 156 char proctitle[BUFSIZ]; /* initial part of title */ 157 #endif /* HASSETPROCTITLE */ 158 159 #define LOGCMD(cmd, file) \ 160 if (logging > 1) \ 161 syslog(LOG_INFO,"%s %s%s", cmd, \ 162 *(file) == '/' ? "" : curdir(), file); 163 #define LOGCMD2(cmd, file1, file2) \ 164 if (logging > 1) \ 165 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 166 *(file1) == '/' ? "" : curdir(), file1, \ 167 *(file2) == '/' ? "" : curdir(), file2); 168 #define LOGBYTES(cmd, file, cnt) \ 169 if (logging > 1) { \ 170 if (cnt == (off_t)-1) \ 171 syslog(LOG_INFO,"%s %s%s", cmd, \ 172 *(file) == '/' ? "" : curdir(), file); \ 173 else \ 174 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 175 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 176 } 177 178 static void ack __P((char *)); 179 static void myoob __P((int)); 180 static int checkuser __P((char *, char *)); 181 static int checkaccess __P((char *)); 182 static FILE *dataconn __P((char *, off_t, char *)); 183 static void dolog __P((struct sockaddr_in *)); 184 static char *curdir __P((void)); 185 static void end_login __P((void)); 186 static FILE *getdatasock __P((char *)); 187 static char *gunique __P((char *)); 188 static void lostconn __P((int)); 189 static int receive_data __P((FILE *, FILE *)); 190 static void send_data __P((FILE *, FILE *, off_t)); 191 static struct passwd * 192 sgetpwnam __P((char *)); 193 static char *sgetsave __P((char *)); 194 195 static char * 196 curdir() 197 { 198 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 199 200 if (getcwd(path, sizeof(path)-2) == NULL) 201 return (""); 202 if (path[1] != '\0') /* special case for root dir. */ 203 strcat(path, "/"); 204 /* For guest account, skip / since it's chrooted */ 205 return (guest ? path+1 : path); 206 } 207 208 int 209 main(argc, argv, envp) 210 int argc; 211 char *argv[]; 212 char **envp; 213 { 214 int addrlen, ch, on = 1, tos; 215 char *cp, line[LINE_MAX]; 216 FILE *fd; 217 218 /* 219 * LOG_NDELAY sets up the logging connection immediately, 220 * necessary for anonymous ftp's that chroot and can't do it later. 221 */ 222 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 223 addrlen = sizeof(his_addr); 224 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 225 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 226 exit(1); 227 } 228 addrlen = sizeof(ctrl_addr); 229 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 230 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 231 exit(1); 232 } 233 #ifdef IP_TOS 234 tos = IPTOS_LOWDELAY; 235 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) 236 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 237 #endif 238 data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); 239 debug = 0; 240 241 /* set this here so klogin can use it... */ 242 (void)sprintf(ttyline, "ftp%d", getpid()); 243 244 while ((ch = getopt(argc, argv, "dlt:T:u:v")) != EOF) { 245 switch (ch) { 246 case 'd': 247 debug = 1; 248 break; 249 250 case 'l': 251 logging++; /* > 1 == extra logging */ 252 break; 253 254 case 't': 255 timeout = atoi(optarg); 256 if (maxtimeout < timeout) 257 maxtimeout = timeout; 258 break; 259 260 case 'T': 261 maxtimeout = atoi(optarg); 262 if (timeout > maxtimeout) 263 timeout = maxtimeout; 264 break; 265 266 case 'u': 267 { 268 long val = 0; 269 270 val = strtol(optarg, &optarg, 8); 271 if (*optarg != '\0' || val < 0) 272 warnx("bad value for -u"); 273 else 274 defumask = val; 275 break; 276 } 277 278 case 'v': 279 debug = 1; 280 break; 281 282 default: 283 warnx("unknown flag -%c ignored", optopt); 284 break; 285 } 286 } 287 (void) freopen(_PATH_DEVNULL, "w", stderr); 288 (void) signal(SIGPIPE, lostconn); 289 (void) signal(SIGCHLD, SIG_IGN); 290 if ((long)signal(SIGURG, myoob) < 0) 291 syslog(LOG_ERR, "signal: %m"); 292 293 /* Try to handle urgent data inline */ 294 #ifdef SO_OOBINLINE 295 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 296 syslog(LOG_ERR, "setsockopt: %m"); 297 #endif 298 299 #ifdef F_SETOWN 300 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 301 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 302 #endif 303 dolog(&his_addr); 304 /* 305 * Set up default state 306 */ 307 data = -1; 308 type = TYPE_A; 309 form = FORM_N; 310 stru = STRU_F; 311 mode = MODE_S; 312 tmpline[0] = '\0'; 313 314 /* If logins are disabled, print out the message. */ 315 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 316 while (fgets(line, sizeof(line), fd) != NULL) { 317 if ((cp = strchr(line, '\n')) != NULL) 318 *cp = '\0'; 319 lreply(530, "%s", line); 320 } 321 (void) fflush(stdout); 322 (void) fclose(fd); 323 reply(530, "System not available."); 324 exit(0); 325 } 326 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 327 while (fgets(line, sizeof(line), fd) != NULL) { 328 if ((cp = strchr(line, '\n')) != NULL) 329 *cp = '\0'; 330 lreply(220, "%s", line); 331 } 332 (void) fflush(stdout); 333 (void) fclose(fd); 334 /* reply(220,) must follow */ 335 } 336 (void) gethostname(hostname, sizeof(hostname)); 337 reply(220, "%s FTP server (%s) ready.", hostname, version); 338 (void) setjmp(errcatch); 339 for (;;) 340 (void) yyparse(); 341 /* NOTREACHED */ 342 } 343 344 static void 345 lostconn(signo) 346 int signo; 347 { 348 349 if (debug) 350 syslog(LOG_DEBUG, "lost connection"); 351 dologout(-1); 352 } 353 354 /* 355 * Helper function for sgetpwnam(). 356 */ 357 static char * 358 sgetsave(s) 359 char *s; 360 { 361 char *new = malloc((unsigned) strlen(s) + 1); 362 363 if (new == NULL) { 364 perror_reply(421, "Local resource failure: malloc"); 365 dologout(1); 366 /* NOTREACHED */ 367 } 368 (void) strcpy(new, s); 369 return (new); 370 } 371 372 /* 373 * Save the result of a getpwnam. Used for USER command, since 374 * the data returned must not be clobbered by any other command 375 * (e.g., globbing). 376 */ 377 static struct passwd * 378 sgetpwnam(name) 379 char *name; 380 { 381 static struct passwd save; 382 struct passwd *p; 383 384 if ((p = getpwnam(name)) == NULL) 385 return (p); 386 if (save.pw_name) { 387 free(save.pw_name); 388 free(save.pw_passwd); 389 free(save.pw_gecos); 390 free(save.pw_dir); 391 free(save.pw_shell); 392 } 393 save = *p; 394 save.pw_name = sgetsave(p->pw_name); 395 save.pw_passwd = sgetsave(p->pw_passwd); 396 save.pw_gecos = sgetsave(p->pw_gecos); 397 save.pw_dir = sgetsave(p->pw_dir); 398 save.pw_shell = sgetsave(p->pw_shell); 399 return (&save); 400 } 401 402 static int login_attempts; /* number of failed login attempts */ 403 static int askpasswd; /* had user command, ask for passwd */ 404 static char curname[10]; /* current USER name */ 405 406 /* 407 * USER command. 408 * Sets global passwd pointer pw if named account exists and is acceptable; 409 * sets askpasswd if a PASS command is expected. If logged in previously, 410 * need to reset state. If name is "ftp" or "anonymous", the name is not in 411 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 412 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 413 * requesting login privileges. Disallow anyone who does not have a standard 414 * shell as returned by getusershell(). Disallow anyone mentioned in the file 415 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 416 */ 417 void 418 user(name) 419 char *name; 420 { 421 if (logged_in) { 422 if (guest) { 423 reply(530, "Can't change user from guest login."); 424 return; 425 } else if (dochroot) { 426 reply(530, "Can't change user from chroot user."); 427 return; 428 } 429 end_login(); 430 } 431 432 guest = 0; 433 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 434 if (checkaccess("ftp") || checkaccess("anonymous")) 435 reply(530, "User %s access denied.", name); 436 else if ((pw = sgetpwnam("ftp")) != NULL) { 437 guest = 1; 438 askpasswd = 1; 439 reply(331, 440 "Guest login ok, type your name as password."); 441 } else 442 reply(530, "User %s unknown.", name); 443 if (!askpasswd && logging) 444 syslog(LOG_NOTICE, 445 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 446 return; 447 } 448 pw = sgetpwnam(name); 449 if (logging) 450 strncpy(curname, name, sizeof(curname)-1); 451 #ifdef SKEY 452 if (!skey_haskey(name)) { 453 char *myskey, *skey_keyinfo __P((char *name)); 454 455 myskey = skey_keyinfo(name); 456 reply(331, "Password [%s] for %s required.", 457 myskey ? myskey : "error getting challenge", name); 458 } else 459 #endif 460 reply(331, "Password required for %s.", name); 461 462 askpasswd = 1; 463 /* 464 * Delay before reading passwd after first failed 465 * attempt to slow down passwd-guessing programs. 466 */ 467 if (login_attempts) 468 sleep((unsigned) login_attempts); 469 } 470 471 /* 472 * Check if a user is in the file "fname" 473 */ 474 static int 475 checkuser(fname, name) 476 char *fname; 477 char *name; 478 { 479 FILE *fd; 480 int found = 0; 481 char *p, line[BUFSIZ]; 482 483 if ((fd = fopen(fname, "r")) != NULL) { 484 while (fgets(line, sizeof(line), fd) != NULL) 485 if ((p = strchr(line, '\n')) != NULL) { 486 *p = '\0'; 487 if (line[0] == '#') 488 continue; 489 if (strcmp(line, name) == 0) { 490 found = 1; 491 break; 492 } 493 } 494 (void) fclose(fd); 495 } 496 return (found); 497 } 498 499 /* 500 * Determine whether a user has access, based on information in 501 * _PATH_FTPUSERS. The users are listed one per line, with `allow' 502 * or `deny' after the username. If anything other than `allow', or 503 * just nothing, is given after the username, `deny' is assumed. 504 * 505 * If the user is not found in the file, but the pseudo-user `*' is, 506 * the permission is taken from that line. 507 * 508 * This is probably not the best way to do this, but it preserves 509 * the old semantics where if a user was listed in the file he was 510 * denied, otherwise he was allowed. 511 * 512 * There is one change in the semantics, however; ftpd will now `fail 513 * safe' and deny all access if there's no /etc/ftpusers file. 514 * 515 * Return 1 if the user is denied, or 0 if he is allowed. 516 */ 517 static int 518 checkaccess(name) 519 char *name; 520 { 521 #define ALLOWED 0 522 #define NOT_ALLOWED 1 523 FILE *fd; 524 int allowed = ALLOWED; 525 char *user, *perm, line[BUFSIZ]; 526 527 if ((fd = fopen(_PATH_FTPUSERS, "r")) == NULL) 528 return NOT_ALLOWED; 529 530 while (fgets(line, sizeof(line), fd) != NULL) { 531 user = strtok(line, " \t\n"); 532 if (user[0] == '#') 533 continue; 534 perm = strtok(NULL, " \t\n"); 535 if (strcmp(user, "*") == 0) { 536 if (perm != NULL && strcmp(perm, "allow") == 0) 537 allowed = ALLOWED; 538 else 539 allowed = NOT_ALLOWED; 540 } 541 if (strcmp(user, name) == 0) { 542 if (perm != NULL && strcmp(perm, "allow") == 0) 543 return ALLOWED; 544 else 545 return NOT_ALLOWED; 546 } 547 } 548 (void) fclose(fd); 549 return (allowed); 550 } 551 #undef ALLOWED 552 #undef NOT_ALLOWED 553 554 /* 555 * Terminate login as previous user, if any, resetting state; 556 * used when USER command is given or login fails. 557 */ 558 static void 559 end_login() 560 { 561 562 (void) seteuid((uid_t)0); 563 if (logged_in) 564 logwtmp(ttyline, "", ""); 565 pw = NULL; 566 logged_in = 0; 567 guest = 0; 568 dochroot = 0; 569 } 570 571 void 572 pass(passwd) 573 char *passwd; 574 { 575 int rval; 576 FILE *fd; 577 char *cp, *shell; 578 579 if (logged_in || askpasswd == 0) { 580 reply(503, "Login with USER first."); 581 return; 582 } 583 askpasswd = 0; 584 if (!guest) { /* "ftp" is only account allowed no password */ 585 if (pw == NULL) { 586 rval = 1; /* failure below */ 587 goto skip; 588 } 589 #if defined(KERBEROS) 590 rval = klogin(pw, "", hostname, passwd); 591 if (rval == 0) 592 goto skip; 593 #endif 594 #ifdef SKEY 595 if (skey_haskey(pw->pw_name) == 0 && 596 (skey_passcheck(pw->pw_name, passwd) != -1)) { 597 rval = 0; 598 goto skip; 599 } 600 #endif 601 /* the strcmp does not catch null passwords! */ 602 if (pw == NULL || *pw->pw_passwd == '\0' || 603 strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { 604 rval = 1; /* failure */ 605 goto skip; 606 } 607 rval = 0; 608 609 skip: 610 /* 611 * If rval == 1, the user failed the authentication check 612 * above. If rval == 0, either Kerberos or local authentication 613 * succeeded. 614 */ 615 if (rval) { 616 reply(530, "Login incorrect."); 617 if (logging) 618 syslog(LOG_NOTICE, 619 "FTP LOGIN FAILED FROM %s, %s", 620 remotehost, curname); 621 pw = NULL; 622 if (login_attempts++ >= 5) { 623 syslog(LOG_NOTICE, 624 "repeated login failures from %s", 625 remotehost); 626 exit(0); 627 } 628 return; 629 } 630 } 631 632 /* password was ok; see if anything else prevents login */ 633 if (checkaccess(pw->pw_name)) { 634 reply(530, "User %s may not use FTP.", pw->pw_name); 635 if (logging) 636 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 637 remotehost, pw->pw_name); 638 pw = (struct passwd *) NULL; 639 return; 640 } 641 /* check for valid shell, if not guest user */ 642 if ((shell = pw->pw_shell) == NULL || *shell == 0) 643 shell = _PATH_BSHELL; 644 while ((cp = getusershell()) != NULL) 645 if (strcmp(cp, shell) == 0) 646 break; 647 endusershell(); 648 if (cp == NULL && guest == 0) { 649 reply(530, "User %s may not use FTP.", pw->pw_name); 650 if (logging) 651 syslog(LOG_NOTICE, 652 "FTP LOGIN REFUSED FROM %s, %s", 653 remotehost, pw->pw_name); 654 pw = (struct passwd *) NULL; 655 return; 656 } 657 658 login_attempts = 0; /* this time successful */ 659 if (setegid((gid_t)pw->pw_gid) < 0) { 660 reply(550, "Can't set gid."); 661 return; 662 } 663 (void) initgroups(pw->pw_name, pw->pw_gid); 664 665 /* open wtmp before chroot */ 666 logwtmp(ttyline, pw->pw_name, remotehost); 667 logged_in = 1; 668 669 dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); 670 if (guest) { 671 /* 672 * We MUST do a chdir() after the chroot. Otherwise 673 * the old current directory will be accessible as "." 674 * outside the new root! 675 */ 676 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 677 reply(550, "Can't set guest privileges."); 678 goto bad; 679 } 680 } else if (dochroot) { 681 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 682 reply(550, "Can't change root."); 683 goto bad; 684 } 685 } else if (chdir(pw->pw_dir) < 0) { 686 if (chdir("/") < 0) { 687 reply(530, "User %s: can't change directory to %s.", 688 pw->pw_name, pw->pw_dir); 689 goto bad; 690 } else 691 lreply(230, "No directory! Logging in with home=/"); 692 } 693 if (seteuid((uid_t)pw->pw_uid) < 0) { 694 reply(550, "Can't set uid."); 695 goto bad; 696 } 697 /* 698 * Display a login message, if it exists. 699 * N.B. reply(230,) must follow the message. 700 */ 701 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 702 char *cp, line[LINE_MAX]; 703 704 while (fgets(line, sizeof(line), fd) != NULL) { 705 if ((cp = strchr(line, '\n')) != NULL) 706 *cp = '\0'; 707 lreply(230, "%s", line); 708 } 709 (void) fflush(stdout); 710 (void) fclose(fd); 711 } 712 if (guest) { 713 reply(230, "Guest login ok, access restrictions apply."); 714 #ifdef HASSETPROCTITLE 715 snprintf(proctitle, sizeof(proctitle), 716 "%s: anonymous/%.*s", remotehost, 717 sizeof(proctitle) - sizeof(remotehost) - 718 sizeof(": anonymous/"), passwd); 719 setproctitle(proctitle); 720 #endif /* HASSETPROCTITLE */ 721 if (logging) 722 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 723 remotehost, passwd); 724 } else { 725 reply(230, "User %s logged in.", pw->pw_name); 726 #ifdef HASSETPROCTITLE 727 snprintf(proctitle, sizeof(proctitle), 728 "%s: %s", remotehost, pw->pw_name); 729 setproctitle(proctitle); 730 #endif /* HASSETPROCTITLE */ 731 if (logging) 732 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 733 remotehost, pw->pw_name); 734 } 735 #ifndef INSECURE_GUEST 736 if (guest) 737 (void) umask(GUEST_CMASK); 738 else 739 #endif 740 (void) umask(defumask); 741 return; 742 bad: 743 /* Forget all about it... */ 744 end_login(); 745 } 746 747 void 748 retrieve(cmd, name) 749 char *cmd, *name; 750 { 751 FILE *fin, *dout; 752 struct stat st; 753 int (*closefunc) __P((FILE *)); 754 755 if (cmd == 0) { 756 fin = fopen(name, "r"), closefunc = fclose; 757 st.st_size = 0; 758 } else { 759 char line[BUFSIZ]; 760 761 (void) sprintf(line, cmd, name), name = line; 762 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 763 st.st_size = -1; 764 st.st_blksize = BUFSIZ; 765 } 766 if (fin == NULL) { 767 if (errno != 0) { 768 perror_reply(550, name); 769 if (cmd == 0) { 770 LOGCMD("get", name); 771 } 772 } 773 return; 774 } 775 byte_count = -1; 776 if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 777 reply(550, "%s: not a plain file.", name); 778 goto done; 779 } 780 if (restart_point) { 781 if (type == TYPE_A) { 782 off_t i, n; 783 int c; 784 785 n = restart_point; 786 i = 0; 787 while (i++ < n) { 788 if ((c=getc(fin)) == EOF) { 789 perror_reply(550, name); 790 goto done; 791 } 792 if (c == '\n') 793 i++; 794 } 795 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 796 perror_reply(550, name); 797 goto done; 798 } 799 } 800 dout = dataconn(name, st.st_size, "w"); 801 if (dout == NULL) 802 goto done; 803 send_data(fin, dout, st.st_blksize); 804 (void) fclose(dout); 805 data = -1; 806 pdata = -1; 807 done: 808 if (cmd == 0) 809 LOGBYTES("get", name, byte_count); 810 (*closefunc)(fin); 811 } 812 813 void 814 store(name, mode, unique) 815 char *name, *mode; 816 int unique; 817 { 818 FILE *fout, *din; 819 struct stat st; 820 int (*closefunc) __P((FILE *)); 821 822 if (unique && stat(name, &st) == 0 && 823 (name = gunique(name)) == NULL) { 824 LOGCMD(*mode == 'w' ? "put" : "append", name); 825 return; 826 } 827 828 if (restart_point) 829 mode = "r+"; 830 fout = fopen(name, mode); 831 closefunc = fclose; 832 if (fout == NULL) { 833 perror_reply(553, name); 834 LOGCMD(*mode == 'w' ? "put" : "append", name); 835 return; 836 } 837 byte_count = -1; 838 if (restart_point) { 839 if (type == TYPE_A) { 840 off_t i, n; 841 int c; 842 843 n = restart_point; 844 i = 0; 845 while (i++ < n) { 846 if ((c=getc(fout)) == EOF) { 847 perror_reply(550, name); 848 goto done; 849 } 850 if (c == '\n') 851 i++; 852 } 853 /* 854 * We must do this seek to "current" position 855 * because we are changing from reading to 856 * writing. 857 */ 858 if (fseek(fout, 0L, L_INCR) < 0) { 859 perror_reply(550, name); 860 goto done; 861 } 862 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 863 perror_reply(550, name); 864 goto done; 865 } 866 } 867 din = dataconn(name, (off_t)-1, "r"); 868 if (din == NULL) 869 goto done; 870 if (receive_data(din, fout) == 0) { 871 if (unique) 872 reply(226, "Transfer complete (unique file name:%s).", 873 name); 874 else 875 reply(226, "Transfer complete."); 876 } 877 (void) fclose(din); 878 data = -1; 879 pdata = -1; 880 done: 881 LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); 882 (*closefunc)(fout); 883 } 884 885 static FILE * 886 getdatasock(mode) 887 char *mode; 888 { 889 int on = 1, s, t, tries; 890 891 if (data >= 0) 892 return (fdopen(data, mode)); 893 (void) seteuid((uid_t)0); 894 s = socket(AF_INET, SOCK_STREAM, 0); 895 if (s < 0) 896 goto bad; 897 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 898 (char *) &on, sizeof(on)) < 0) 899 goto bad; 900 /* anchor socket to avoid multi-homing problems */ 901 data_source.sin_len = sizeof(struct sockaddr_in); 902 data_source.sin_family = AF_INET; 903 data_source.sin_addr = ctrl_addr.sin_addr; 904 for (tries = 1; ; tries++) { 905 if (bind(s, (struct sockaddr *)&data_source, 906 sizeof(data_source)) >= 0) 907 break; 908 if (errno != EADDRINUSE || tries > 10) 909 goto bad; 910 sleep(tries); 911 } 912 (void) seteuid((uid_t)pw->pw_uid); 913 #ifdef IP_TOS 914 on = IPTOS_THROUGHPUT; 915 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 916 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 917 #endif 918 return (fdopen(s, mode)); 919 bad: 920 /* Return the real value of errno (close may change it) */ 921 t = errno; 922 (void) seteuid((uid_t)pw->pw_uid); 923 (void) close(s); 924 errno = t; 925 return (NULL); 926 } 927 928 static FILE * 929 dataconn(name, size, mode) 930 char *name; 931 off_t size; 932 char *mode; 933 { 934 char sizebuf[32]; 935 FILE *file; 936 int retry = 0, tos; 937 938 file_size = size; 939 byte_count = 0; 940 if (size != (off_t) -1) 941 (void) sprintf(sizebuf, " (%qd bytes)", size); 942 else 943 (void) strcpy(sizebuf, ""); 944 if (pdata >= 0) { 945 struct sockaddr_in from; 946 int s, fromlen = sizeof(from); 947 948 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 949 if (s < 0) { 950 reply(425, "Can't open data connection."); 951 (void) close(pdata); 952 pdata = -1; 953 return (NULL); 954 } 955 (void) close(pdata); 956 pdata = s; 957 #ifdef IP_TOS 958 tos = IPTOS_THROUGHPUT; 959 (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, 960 sizeof(int)); 961 #endif 962 reply(150, "Opening %s mode data connection for '%s'%s.", 963 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 964 return (fdopen(pdata, mode)); 965 } 966 if (data >= 0) { 967 reply(125, "Using existing data connection for '%s'%s.", 968 name, sizebuf); 969 usedefault = 1; 970 return (fdopen(data, mode)); 971 } 972 if (usedefault) 973 data_dest = his_addr; 974 usedefault = 1; 975 file = getdatasock(mode); 976 if (file == NULL) { 977 reply(425, "Can't create data socket (%s,%d): %s.", 978 inet_ntoa(data_source.sin_addr), 979 ntohs(data_source.sin_port), strerror(errno)); 980 return (NULL); 981 } 982 data = fileno(file); 983 while (connect(data, (struct sockaddr *)&data_dest, 984 sizeof(data_dest)) < 0) { 985 if (errno == EADDRINUSE && retry < swaitmax) { 986 sleep((unsigned) swaitint); 987 retry += swaitint; 988 continue; 989 } 990 perror_reply(425, "Can't build data connection"); 991 (void) fclose(file); 992 data = -1; 993 return (NULL); 994 } 995 reply(150, "Opening %s mode data connection for '%s'%s.", 996 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 997 return (file); 998 } 999 1000 /* 1001 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1002 * encapsulation of the data subject * to Mode, Structure, and Type. 1003 * 1004 * NB: Form isn't handled. 1005 */ 1006 static void 1007 send_data(instr, outstr, blksize) 1008 FILE *instr, *outstr; 1009 off_t blksize; 1010 { 1011 int c, cnt, filefd, netfd; 1012 char *buf; 1013 1014 transflag++; 1015 if (setjmp(urgcatch)) { 1016 transflag = 0; 1017 return; 1018 } 1019 switch (type) { 1020 1021 case TYPE_A: 1022 while ((c = getc(instr)) != EOF) { 1023 byte_count++; 1024 if (c == '\n') { 1025 if (ferror(outstr)) 1026 goto data_err; 1027 (void) putc('\r', outstr); 1028 } 1029 (void) putc(c, outstr); 1030 } 1031 fflush(outstr); 1032 transflag = 0; 1033 if (ferror(instr)) 1034 goto file_err; 1035 if (ferror(outstr)) 1036 goto data_err; 1037 reply(226, "Transfer complete."); 1038 return; 1039 1040 case TYPE_I: 1041 case TYPE_L: 1042 if ((buf = malloc((u_int)blksize)) == NULL) { 1043 transflag = 0; 1044 perror_reply(451, "Local resource failure: malloc"); 1045 return; 1046 } 1047 netfd = fileno(outstr); 1048 filefd = fileno(instr); 1049 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 1050 write(netfd, buf, cnt) == cnt) 1051 byte_count += cnt; 1052 transflag = 0; 1053 (void)free(buf); 1054 if (cnt != 0) { 1055 if (cnt < 0) 1056 goto file_err; 1057 goto data_err; 1058 } 1059 reply(226, "Transfer complete."); 1060 return; 1061 default: 1062 transflag = 0; 1063 reply(550, "Unimplemented TYPE %d in send_data", type); 1064 return; 1065 } 1066 1067 data_err: 1068 transflag = 0; 1069 perror_reply(426, "Data connection"); 1070 return; 1071 1072 file_err: 1073 transflag = 0; 1074 perror_reply(551, "Error on input file"); 1075 } 1076 1077 /* 1078 * Transfer data from peer to "outstr" using the appropriate encapulation of 1079 * the data subject to Mode, Structure, and Type. 1080 * 1081 * N.B.: Form isn't handled. 1082 */ 1083 static int 1084 receive_data(instr, outstr) 1085 FILE *instr, *outstr; 1086 { 1087 int c; 1088 int cnt, bare_lfs = 0; 1089 char buf[BUFSIZ]; 1090 1091 transflag++; 1092 if (setjmp(urgcatch)) { 1093 transflag = 0; 1094 return (-1); 1095 } 1096 switch (type) { 1097 1098 case TYPE_I: 1099 case TYPE_L: 1100 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 1101 if (write(fileno(outstr), buf, cnt) != cnt) 1102 goto file_err; 1103 byte_count += cnt; 1104 } 1105 if (cnt < 0) 1106 goto data_err; 1107 transflag = 0; 1108 return (0); 1109 1110 case TYPE_E: 1111 reply(553, "TYPE E not implemented."); 1112 transflag = 0; 1113 return (-1); 1114 1115 case TYPE_A: 1116 while ((c = getc(instr)) != EOF) { 1117 byte_count++; 1118 if (c == '\n') 1119 bare_lfs++; 1120 while (c == '\r') { 1121 if (ferror(outstr)) 1122 goto data_err; 1123 if ((c = getc(instr)) != '\n') { 1124 (void) putc ('\r', outstr); 1125 if (c == '\0' || c == EOF) 1126 goto contin2; 1127 } 1128 } 1129 (void) putc(c, outstr); 1130 contin2: ; 1131 } 1132 fflush(outstr); 1133 if (ferror(instr)) 1134 goto data_err; 1135 if (ferror(outstr)) 1136 goto file_err; 1137 transflag = 0; 1138 if (bare_lfs) { 1139 lreply(226, 1140 "WARNING! %d bare linefeeds received in ASCII mode", 1141 bare_lfs); 1142 (void)printf(" File may not have transferred correctly.\r\n"); 1143 } 1144 return (0); 1145 default: 1146 reply(550, "Unimplemented TYPE %d in receive_data", type); 1147 transflag = 0; 1148 return (-1); 1149 } 1150 1151 data_err: 1152 transflag = 0; 1153 perror_reply(426, "Data Connection"); 1154 return (-1); 1155 1156 file_err: 1157 transflag = 0; 1158 perror_reply(452, "Error writing file"); 1159 return (-1); 1160 } 1161 1162 void 1163 statfilecmd(filename) 1164 char *filename; 1165 { 1166 FILE *fin; 1167 int c; 1168 char line[LINE_MAX]; 1169 1170 (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); 1171 fin = ftpd_popen(line, "r"); 1172 lreply(211, "status of %s:", filename); 1173 while ((c = getc(fin)) != EOF) { 1174 if (c == '\n') { 1175 if (ferror(stdout)){ 1176 perror_reply(421, "control connection"); 1177 (void) ftpd_pclose(fin); 1178 dologout(1); 1179 /* NOTREACHED */ 1180 } 1181 if (ferror(fin)) { 1182 perror_reply(551, filename); 1183 (void) ftpd_pclose(fin); 1184 return; 1185 } 1186 (void) putc('\r', stdout); 1187 } 1188 (void) putc(c, stdout); 1189 } 1190 (void) ftpd_pclose(fin); 1191 reply(211, "End of Status"); 1192 } 1193 1194 void 1195 statcmd() 1196 { 1197 struct sockaddr_in *sin; 1198 u_char *a, *p; 1199 1200 lreply(211, "%s FTP server status:", hostname, version); 1201 printf(" %s\r\n", version); 1202 printf(" Connected to %s", remotehost); 1203 if (!isdigit(remotehost[0])) 1204 printf(" (%s)", inet_ntoa(his_addr.sin_addr)); 1205 printf("\r\n"); 1206 if (logged_in) { 1207 if (guest) 1208 printf(" Logged in anonymously\r\n"); 1209 else 1210 printf(" Logged in as %s\r\n", pw->pw_name); 1211 } else if (askpasswd) 1212 printf(" Waiting for password\r\n"); 1213 else 1214 printf(" Waiting for user name\r\n"); 1215 printf(" TYPE: %s", typenames[type]); 1216 if (type == TYPE_A || type == TYPE_E) 1217 printf(", FORM: %s", formnames[form]); 1218 if (type == TYPE_L) 1219 #if NBBY == 8 1220 printf(" %d", NBBY); 1221 #else 1222 printf(" %d", bytesize); /* need definition! */ 1223 #endif 1224 printf("; STRUcture: %s; transfer MODE: %s\r\n", 1225 strunames[stru], modenames[mode]); 1226 if (data != -1) 1227 printf(" Data connection open\r\n"); 1228 else if (pdata != -1) { 1229 printf(" in Passive mode"); 1230 sin = &pasv_addr; 1231 goto printaddr; 1232 } else if (usedefault == 0) { 1233 printf(" PORT"); 1234 sin = &data_dest; 1235 printaddr: 1236 a = (u_char *) &sin->sin_addr; 1237 p = (u_char *) &sin->sin_port; 1238 #define UC(b) (((int) b) & 0xff) 1239 printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), 1240 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1241 #undef UC 1242 } else 1243 printf(" No data connection\r\n"); 1244 reply(211, "End of status"); 1245 } 1246 1247 void 1248 fatal(s) 1249 char *s; 1250 { 1251 1252 reply(451, "Error in server: %s\n", s); 1253 reply(221, "Closing connection due to server error."); 1254 dologout(0); 1255 /* NOTREACHED */ 1256 } 1257 1258 void 1259 #if __STDC__ 1260 reply(int n, const char *fmt, ...) 1261 #else 1262 reply(n, fmt, va_alist) 1263 int n; 1264 char *fmt; 1265 va_dcl 1266 #endif 1267 { 1268 va_list ap; 1269 #if __STDC__ 1270 va_start(ap, fmt); 1271 #else 1272 va_start(ap); 1273 #endif 1274 (void)printf("%d ", n); 1275 (void)vprintf(fmt, ap); 1276 (void)printf("\r\n"); 1277 (void)fflush(stdout); 1278 if (debug) { 1279 syslog(LOG_DEBUG, "<--- %d ", n); 1280 vsyslog(LOG_DEBUG, fmt, ap); 1281 } 1282 } 1283 1284 void 1285 #if __STDC__ 1286 lreply(int n, const char *fmt, ...) 1287 #else 1288 lreply(n, fmt, va_alist) 1289 int n; 1290 char *fmt; 1291 va_dcl 1292 #endif 1293 { 1294 va_list ap; 1295 #if __STDC__ 1296 va_start(ap, fmt); 1297 #else 1298 va_start(ap); 1299 #endif 1300 (void)printf("%d- ", n); 1301 (void)vprintf(fmt, ap); 1302 (void)printf("\r\n"); 1303 (void)fflush(stdout); 1304 if (debug) { 1305 syslog(LOG_DEBUG, "<--- %d- ", n); 1306 vsyslog(LOG_DEBUG, fmt, ap); 1307 } 1308 } 1309 1310 static void 1311 ack(s) 1312 char *s; 1313 { 1314 1315 reply(250, "%s command successful.", s); 1316 } 1317 1318 void 1319 nack(s) 1320 char *s; 1321 { 1322 1323 reply(502, "%s command not implemented.", s); 1324 } 1325 1326 /* ARGSUSED */ 1327 void 1328 yyerror(s) 1329 char *s; 1330 { 1331 char *cp; 1332 1333 if (cp = strchr(cbuf,'\n')) 1334 *cp = '\0'; 1335 reply(500, "'%s': command not understood.", cbuf); 1336 } 1337 1338 void 1339 delete(name) 1340 char *name; 1341 { 1342 struct stat st; 1343 1344 LOGCMD("delete", name); 1345 if (stat(name, &st) < 0) { 1346 perror_reply(550, name); 1347 return; 1348 } 1349 if ((st.st_mode&S_IFMT) == S_IFDIR) { 1350 if (rmdir(name) < 0) { 1351 perror_reply(550, name); 1352 return; 1353 } 1354 goto done; 1355 } 1356 if (unlink(name) < 0) { 1357 perror_reply(550, name); 1358 return; 1359 } 1360 done: 1361 ack("DELE"); 1362 } 1363 1364 void 1365 cwd(path) 1366 char *path; 1367 { 1368 1369 if (chdir(path) < 0) 1370 perror_reply(550, path); 1371 else 1372 ack("CWD"); 1373 } 1374 1375 void 1376 makedir(name) 1377 char *name; 1378 { 1379 1380 LOGCMD("mkdir", name); 1381 if (mkdir(name, 0777) < 0) 1382 perror_reply(550, name); 1383 else 1384 reply(257, "MKD command successful."); 1385 } 1386 1387 void 1388 removedir(name) 1389 char *name; 1390 { 1391 1392 LOGCMD("rmdir", name); 1393 if (rmdir(name) < 0) 1394 perror_reply(550, name); 1395 else 1396 ack("RMD"); 1397 } 1398 1399 void 1400 pwd() 1401 { 1402 char path[MAXPATHLEN + 1]; 1403 1404 if (getwd(path) == (char *)NULL) 1405 reply(550, "%s.", path); 1406 else 1407 reply(257, "\"%s\" is current directory.", path); 1408 } 1409 1410 char * 1411 renamefrom(name) 1412 char *name; 1413 { 1414 struct stat st; 1415 1416 if (stat(name, &st) < 0) { 1417 perror_reply(550, name); 1418 return ((char *)0); 1419 } 1420 reply(350, "File exists, ready for destination name"); 1421 return (name); 1422 } 1423 1424 void 1425 renamecmd(from, to) 1426 char *from, *to; 1427 { 1428 1429 LOGCMD2("rename", from, to); 1430 if (rename(from, to) < 0) 1431 perror_reply(550, "rename"); 1432 else 1433 ack("RNTO"); 1434 } 1435 1436 static void 1437 dolog(sin) 1438 struct sockaddr_in *sin; 1439 { 1440 struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, 1441 sizeof(struct in_addr), AF_INET); 1442 1443 if (hp) 1444 (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)); 1445 else 1446 (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), 1447 sizeof(remotehost)); 1448 #ifdef HASSETPROCTITLE 1449 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 1450 setproctitle(proctitle); 1451 #endif /* HASSETPROCTITLE */ 1452 1453 if (logging) 1454 syslog(LOG_INFO, "connection from %s", remotehost); 1455 } 1456 1457 /* 1458 * Record logout in wtmp file 1459 * and exit with supplied status. 1460 */ 1461 void 1462 dologout(status) 1463 int status; 1464 { 1465 /* 1466 * Prevent reception of SIGURG from resulting in a resumption 1467 * back to the main program loop. 1468 */ 1469 transflag = 0; 1470 1471 if (logged_in) { 1472 (void) seteuid((uid_t)0); 1473 logwtmp(ttyline, "", ""); 1474 #if defined(KERBEROS) 1475 if (!notickets && krbtkfile_env) 1476 unlink(krbtkfile_env); 1477 #endif 1478 } 1479 /* beware of flushing buffers after a SIGPIPE */ 1480 _exit(status); 1481 } 1482 1483 static void 1484 myoob(signo) 1485 int signo; 1486 { 1487 char *cp; 1488 1489 /* only process if transfer occurring */ 1490 if (!transflag) 1491 return; 1492 cp = tmpline; 1493 if (getline(cp, 7, stdin) == NULL) { 1494 reply(221, "You could at least say goodbye."); 1495 dologout(0); 1496 } 1497 upper(cp); 1498 if (strcmp(cp, "ABOR\r\n") == 0) { 1499 tmpline[0] = '\0'; 1500 reply(426, "Transfer aborted. Data connection closed."); 1501 reply(226, "Abort successful"); 1502 longjmp(urgcatch, 1); 1503 } 1504 if (strcmp(cp, "STAT\r\n") == 0) { 1505 if (file_size != (off_t) -1) 1506 reply(213, "Status: %qd of %qd bytes transferred", 1507 byte_count, file_size); 1508 else 1509 reply(213, "Status: %qd bytes transferred", byte_count); 1510 } 1511 } 1512 1513 /* 1514 * Note: a response of 425 is not mentioned as a possible response to 1515 * the PASV command in RFC959. However, it has been blessed as 1516 * a legitimate response by Jon Postel in a telephone conversation 1517 * with Rick Adams on 25 Jan 89. 1518 */ 1519 void 1520 passive() 1521 { 1522 int len; 1523 char *p, *a; 1524 1525 pdata = socket(AF_INET, SOCK_STREAM, 0); 1526 if (pdata < 0) { 1527 perror_reply(425, "Can't open passive connection"); 1528 return; 1529 } 1530 pasv_addr = ctrl_addr; 1531 pasv_addr.sin_port = 0; 1532 (void) seteuid((uid_t)0); 1533 if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) { 1534 (void) seteuid((uid_t)pw->pw_uid); 1535 goto pasv_error; 1536 } 1537 (void) seteuid((uid_t)pw->pw_uid); 1538 len = sizeof(pasv_addr); 1539 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 1540 goto pasv_error; 1541 if (listen(pdata, 1) < 0) 1542 goto pasv_error; 1543 a = (char *) &pasv_addr.sin_addr; 1544 p = (char *) &pasv_addr.sin_port; 1545 1546 #define UC(b) (((int) b) & 0xff) 1547 1548 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 1549 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 1550 return; 1551 1552 pasv_error: 1553 (void) close(pdata); 1554 pdata = -1; 1555 perror_reply(425, "Can't open passive connection"); 1556 return; 1557 } 1558 1559 /* 1560 * Generate unique name for file with basename "local". 1561 * The file named "local" is already known to exist. 1562 * Generates failure reply on error. 1563 */ 1564 static char * 1565 gunique(local) 1566 char *local; 1567 { 1568 static char new[MAXPATHLEN]; 1569 struct stat st; 1570 int count; 1571 char *cp; 1572 1573 cp = strrchr(local, '/'); 1574 if (cp) 1575 *cp = '\0'; 1576 if (stat(cp ? local : ".", &st) < 0) { 1577 perror_reply(553, cp ? local : "."); 1578 return ((char *) 0); 1579 } 1580 if (cp) 1581 *cp = '/'; 1582 (void) strcpy(new, local); 1583 cp = new + strlen(new); 1584 *cp++ = '.'; 1585 for (count = 1; count < 100; count++) { 1586 (void)sprintf(cp, "%d", count); 1587 if (stat(new, &st) < 0) 1588 return (new); 1589 } 1590 reply(452, "Unique file name cannot be created."); 1591 return (NULL); 1592 } 1593 1594 /* 1595 * Format and send reply containing system error number. 1596 */ 1597 void 1598 perror_reply(code, string) 1599 int code; 1600 char *string; 1601 { 1602 1603 reply(code, "%s: %s.", string, strerror(errno)); 1604 } 1605 1606 static char *onefile[] = { 1607 "", 1608 0 1609 }; 1610 1611 void 1612 send_file_list(whichf) 1613 char *whichf; 1614 { 1615 struct stat st; 1616 DIR *dirp = NULL; 1617 struct dirent *dir; 1618 FILE *dout = NULL; 1619 char **dirlist, *dirname; 1620 int simple = 0; 1621 int freeglob = 0; 1622 glob_t gl; 1623 1624 if (strpbrk(whichf, "~{[*?") != NULL) { 1625 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 1626 1627 memset(&gl, 0, sizeof(gl)); 1628 freeglob = 1; 1629 if (glob(whichf, flags, 0, &gl)) { 1630 reply(550, "not found"); 1631 goto out; 1632 } else if (gl.gl_pathc == 0) { 1633 errno = ENOENT; 1634 perror_reply(550, whichf); 1635 goto out; 1636 } 1637 dirlist = gl.gl_pathv; 1638 } else { 1639 onefile[0] = whichf; 1640 dirlist = onefile; 1641 simple = 1; 1642 } 1643 1644 if (setjmp(urgcatch)) { 1645 transflag = 0; 1646 goto out; 1647 } 1648 while (dirname = *dirlist++) { 1649 if (stat(dirname, &st) < 0) { 1650 /* 1651 * If user typed "ls -l", etc, and the client 1652 * used NLST, do what the user meant. 1653 */ 1654 if (dirname[0] == '-' && *dirlist == NULL && 1655 transflag == 0) { 1656 retrieve("/bin/ls %s", dirname); 1657 goto out; 1658 } 1659 perror_reply(550, whichf); 1660 if (dout != NULL) { 1661 (void) fclose(dout); 1662 transflag = 0; 1663 data = -1; 1664 pdata = -1; 1665 } 1666 goto out; 1667 } 1668 1669 if (S_ISREG(st.st_mode)) { 1670 if (dout == NULL) { 1671 dout = dataconn("file list", (off_t)-1, "w"); 1672 if (dout == NULL) 1673 goto out; 1674 transflag++; 1675 } 1676 fprintf(dout, "%s%s\n", dirname, 1677 type == TYPE_A ? "\r" : ""); 1678 byte_count += strlen(dirname) + 1; 1679 continue; 1680 } else if (!S_ISDIR(st.st_mode)) 1681 continue; 1682 1683 if ((dirp = opendir(dirname)) == NULL) 1684 continue; 1685 1686 while ((dir = readdir(dirp)) != NULL) { 1687 char nbuf[MAXPATHLEN]; 1688 1689 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 1690 continue; 1691 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 1692 dir->d_namlen == 2) 1693 continue; 1694 1695 sprintf(nbuf, "%s/%s", dirname, dir->d_name); 1696 1697 /* 1698 * We have to do a stat to insure it's 1699 * not a directory or special file. 1700 */ 1701 if (simple || (stat(nbuf, &st) == 0 && 1702 S_ISREG(st.st_mode))) { 1703 if (dout == NULL) { 1704 dout = dataconn("file list", (off_t)-1, 1705 "w"); 1706 if (dout == NULL) 1707 goto out; 1708 transflag++; 1709 } 1710 if (nbuf[0] == '.' && nbuf[1] == '/') 1711 fprintf(dout, "%s%s\n", &nbuf[2], 1712 type == TYPE_A ? "\r" : ""); 1713 else 1714 fprintf(dout, "%s%s\n", nbuf, 1715 type == TYPE_A ? "\r" : ""); 1716 byte_count += strlen(nbuf) + 1; 1717 } 1718 } 1719 (void) closedir(dirp); 1720 } 1721 1722 if (dout == NULL) 1723 reply(550, "No files found."); 1724 else if (ferror(dout) != 0) 1725 perror_reply(550, "Data connection"); 1726 else 1727 reply(226, "Transfer complete."); 1728 1729 transflag = 0; 1730 if (dout != NULL) 1731 (void) fclose(dout); 1732 data = -1; 1733 pdata = -1; 1734 out: 1735 if (freeglob) { 1736 freeglob = 0; 1737 globfree(&gl); 1738 } 1739 } 1740
Indexes created Mon Sep 22 13:09:51 GMT 2025