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 * @(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94 35 */ 36 37 #if 0 38 static const char rcsid[] = 39 "$FreeBSD: src/libexec/ftpd/ftpd.c,v 1.62.2.48 2003/02/14 12:42:42 yar Exp $"; 40 "$DragonFly: src/libexec/ftpd/ftpd.c,v 1.3 2003/11/14 03:54:30 dillon Exp $"; 41 #endif /* not lint */ 42 43 /* 44 * FTP server. 45 */ 46 #include <sys/param.h> 47 #include <sys/ioctl.h> 48 #include <sys/mman.h> 49 #include <sys/socket.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 #include <sys/wait.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #include <netinet/tcp.h> 58 59 #define FTP_NAMES 60 #include <arpa/ftp.h> 61 #include <arpa/inet.h> 62 #include <arpa/telnet.h> 63 64 #include <ctype.h> 65 #include <dirent.h> 66 #include <err.h> 67 #include <errno.h> 68 #include <fcntl.h> 69 #include <glob.h> 70 #include <limits.h> 71 #include <netdb.h> 72 #include <pwd.h> 73 #include <grp.h> 74 #include <signal.h> 75 #include <stdio.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <syslog.h> 79 #include <time.h> 80 #include <unistd.h> 81 #include <libutil.h> 82 #ifdef LOGIN_CAP 83 #include <login_cap.h> 84 #endif 85 86 #ifdef SKEY 87 #include <skey.h> 88 #endif 89 90 #if !defined(NOPAM) 91 #include <security/pam_appl.h> 92 #endif 93 94 #include "pathnames.h" 95 #include "extern.h" 96 97 #if __STDC__ 98 #include <stdarg.h> 99 #else 100 #include <varargs.h> 101 #endif 102 103 static char version[] = "Version 6.00LS"; 104 #undef main 105 106 extern off_t restart_point; 107 extern char cbuf[]; 108 109 union sockunion server_addr; 110 union sockunion ctrl_addr; 111 union sockunion data_source; 112 union sockunion data_dest; 113 union sockunion his_addr; 114 union sockunion pasv_addr; 115 116 int daemon_mode; 117 int data; 118 int dataport; 119 int hostinfo = 1; /* print host-specific info in messages */ 120 int logged_in; 121 struct passwd *pw; 122 char *homedir; 123 int ftpdebug; 124 int timeout = 900; /* timeout after 15 minutes of inactivity */ 125 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 126 int logging; 127 int restricted_data_ports = 1; 128 int paranoid = 1; /* be extra careful about security */ 129 int anon_only = 0; /* Only anonymous ftp allowed */ 130 int guest; 131 int dochroot; 132 int dowtmp = 1; 133 int stats; 134 int statfd = -1; 135 int type; 136 int form; 137 int stru; /* avoid C keyword */ 138 int mode; 139 int usedefault = 1; /* for data transfers */ 140 int pdata = -1; /* for passive mode */ 141 int readonly=0; /* Server is in readonly mode. */ 142 int noepsv=0; /* EPSV command is disabled. */ 143 int noretr=0; /* RETR command is disabled. */ 144 int noguestretr=0; /* RETR command is disabled for anon users. */ 145 int noguestmkd=0; /* MKD command is disabled for anon users. */ 146 int noguestmod=1; /* anon users may not modify existing files. */ 147 148 static volatile sig_atomic_t recvurg; 149 sig_atomic_t transflag; 150 off_t file_size; 151 off_t byte_count; 152 #if !defined(CMASK) || CMASK == 0 153 #undef CMASK 154 #define CMASK 027 155 #endif 156 int defumask = CMASK; /* default umask value */ 157 char tmpline[7]; 158 char *hostname; 159 int epsvall = 0; 160 161 #ifdef VIRTUAL_HOSTING 162 char *ftpuser; 163 164 static struct ftphost { 165 struct ftphost *next; 166 struct addrinfo *hostinfo; 167 char *hostname; 168 char *anonuser; 169 char *statfile; 170 char *welcome; 171 char *loginmsg; 172 } *thishost, *firsthost; 173 174 #endif 175 char remotehost[MAXHOSTNAMELEN]; 176 char *ident = NULL; 177 178 static char ttyline[20]; 179 char *tty = ttyline; /* for klogin */ 180 181 #if !defined(NOPAM) 182 static int auth_pam (struct passwd**, const char*); 183 #endif 184 185 char *pid_file = NULL; 186 187 /* 188 * Limit number of pathnames that glob can return. 189 * A limit of 0 indicates the number of pathnames is unlimited. 190 */ 191 #define MAXGLOBARGS 16384 192 # 193 194 /* 195 * Timeout intervals for retrying connections 196 * to hosts that don't accept PORT cmds. This 197 * is a kludge, but given the problems with TCP... 198 */ 199 #define SWAITMAX 90 /* wait at most 90 seconds */ 200 #define SWAITINT 5 /* interval between retries */ 201 202 int swaitmax = SWAITMAX; 203 int swaitint = SWAITINT; 204 205 #ifdef SETPROCTITLE 206 #ifdef OLD_SETPROCTITLE 207 char **Argv = NULL; /* pointer to argument vector */ 208 char *LastArgv = NULL; /* end of argv */ 209 #endif /* OLD_SETPROCTITLE */ 210 char proctitle[LINE_MAX]; /* initial part of title */ 211 #endif /* SETPROCTITLE */ 212 213 #ifdef SKEY 214 int pwok = 0; 215 #endif 216 217 #define LOGCMD(cmd, file) \ 218 if (logging > 1) \ 219 syslog(LOG_INFO,"%s %s%s", cmd, \ 220 *(file) == '/' ? "" : curdir(), file); 221 #define LOGCMD2(cmd, file1, file2) \ 222 if (logging > 1) \ 223 syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ 224 *(file1) == '/' ? "" : curdir(), file1, \ 225 *(file2) == '/' ? "" : curdir(), file2); 226 #define LOGBYTES(cmd, file, cnt) \ 227 if (logging > 1) { \ 228 if (cnt == (off_t)-1) \ 229 syslog(LOG_INFO,"%s %s%s", cmd, \ 230 *(file) == '/' ? "" : curdir(), file); \ 231 else \ 232 syslog(LOG_INFO, "%s %s%s = %qd bytes", \ 233 cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ 234 } 235 236 #ifdef VIRTUAL_HOSTING 237 static void inithosts (void); 238 static void selecthost (union sockunion *); 239 #endif 240 static void ack (char *); 241 static void sigurg (int); 242 static void myoob (void); 243 static int checkuser (char *, char *, int, char **); 244 static FILE *dataconn (char *, off_t, char *); 245 static void dolog (struct sockaddr *); 246 static char *curdir (void); 247 static void end_login (void); 248 static FILE *getdatasock (char *); 249 static int guniquefd (char *, char **); 250 static void lostconn (int); 251 static void sigquit (int); 252 static int receive_data (FILE *, FILE *); 253 static int send_data (FILE *, FILE *, off_t, off_t, int); 254 static struct passwd * 255 sgetpwnam (char *); 256 static char *sgetsave (char *); 257 static void reapchild (int); 258 static void logxfer (char *, off_t, time_t); 259 static char *doublequote (char *); 260 261 static char * 262 curdir() 263 { 264 static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ 265 266 if (getcwd(path, sizeof(path)-2) == NULL) 267 return (""); 268 if (path[1] != '\0') /* special case for root dir. */ 269 strcat(path, "/"); 270 /* For guest account, skip / since it's chrooted */ 271 return (guest ? path+1 : path); 272 } 273 274 int 275 main(argc, argv, envp) 276 int argc; 277 char *argv[]; 278 char **envp; 279 { 280 int addrlen, ch, on = 1, tos; 281 char *cp, line[LINE_MAX]; 282 FILE *fd; 283 int error; 284 char *bindname = NULL; 285 const char *bindport = "ftp"; 286 int family = AF_UNSPEC; 287 int enable_v4 = 0; 288 struct sigaction sa; 289 290 tzset(); /* in case no timezone database in ~ftp */ 291 sigemptyset(&sa.sa_mask); 292 sa.sa_flags = SA_RESTART; 293 294 #ifdef OLD_SETPROCTITLE 295 /* 296 * Save start and extent of argv for setproctitle. 297 */ 298 Argv = argv; 299 while (*envp) 300 envp++; 301 LastArgv = envp[-1] + strlen(envp[-1]); 302 #endif /* OLD_SETPROCTITLE */ 303 304 305 while ((ch = getopt(argc, argv, 306 "46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 307 switch (ch) { 308 case '4': 309 enable_v4 = 1; 310 if (family == AF_UNSPEC) 311 family = AF_INET; 312 break; 313 314 case '6': 315 family = AF_INET6; 316 break; 317 318 case 'a': 319 bindname = optarg; 320 break; 321 322 case 'A': 323 anon_only = 1; 324 break; 325 326 case 'd': 327 ftpdebug++; 328 break; 329 330 case 'D': 331 daemon_mode++; 332 break; 333 334 case 'E': 335 noepsv = 1; 336 break; 337 338 case 'h': 339 hostinfo = 0; 340 break; 341 342 case 'l': 343 logging++; /* > 1 == extra logging */ 344 break; 345 346 case 'm': 347 noguestmod = 0; 348 break; 349 350 case 'M': 351 noguestmkd = 1; 352 break; 353 354 case 'o': 355 noretr = 1; 356 break; 357 358 case 'O': 359 noguestretr = 1; 360 break; 361 362 case 'p': 363 pid_file = optarg; 364 break; 365 366 case 'P': 367 bindport = optarg; 368 break; 369 370 case 'r': 371 readonly = 1; 372 break; 373 374 case 'R': 375 paranoid = 0; 376 break; 377 378 case 'S': 379 stats++; 380 break; 381 382 case 't': 383 timeout = atoi(optarg); 384 if (maxtimeout < timeout) 385 maxtimeout = timeout; 386 break; 387 388 case 'T': 389 maxtimeout = atoi(optarg); 390 if (timeout > maxtimeout) 391 timeout = maxtimeout; 392 break; 393 394 case 'u': 395 { 396 long val = 0; 397 398 val = strtol(optarg, &optarg, 8); 399 if (*optarg != '\0' || val < 0) 400 warnx("bad value for -u"); 401 else 402 defumask = val; 403 break; 404 } 405 case 'U': 406 restricted_data_ports = 0; 407 break; 408 409 case 'v': 410 ftpdebug++; 411 break; 412 413 case 'W': 414 dowtmp = 0; 415 break; 416 417 default: 418 warnx("unknown flag -%c ignored", optopt); 419 break; 420 } 421 } 422 423 #ifdef VIRTUAL_HOSTING 424 inithosts(); 425 #endif 426 (void) freopen(_PATH_DEVNULL, "w", stderr); 427 428 /* 429 * LOG_NDELAY sets up the logging connection immediately, 430 * necessary for anonymous ftp's that chroot and can't do it later. 431 */ 432 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 433 434 if (daemon_mode) { 435 int ctl_sock, fd; 436 struct addrinfo hints, *res; 437 438 /* 439 * Detach from parent. 440 */ 441 if (daemon(1, 1) < 0) { 442 syslog(LOG_ERR, "failed to become a daemon"); 443 exit(1); 444 } 445 sa.sa_handler = reapchild; 446 (void)sigaction(SIGCHLD, &sa, NULL); 447 /* init bind_sa */ 448 memset(&hints, 0, sizeof(hints)); 449 450 hints.ai_family = family == AF_UNSPEC ? AF_INET : family; 451 hints.ai_socktype = SOCK_STREAM; 452 hints.ai_protocol = 0; 453 hints.ai_flags = AI_PASSIVE; 454 error = getaddrinfo(bindname, bindport, &hints, &res); 455 if (error) { 456 if (family == AF_UNSPEC) { 457 hints.ai_family = AF_UNSPEC; 458 error = getaddrinfo(bindname, bindport, &hints, 459 &res); 460 } 461 } 462 if (error) { 463 syslog(LOG_ERR, "%s", gai_strerror(error)); 464 if (error == EAI_SYSTEM) 465 syslog(LOG_ERR, "%s", strerror(errno)); 466 exit(1); 467 } 468 if (res->ai_addr == NULL) { 469 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 470 exit(1); 471 } else 472 family = res->ai_addr->sa_family; 473 /* 474 * Open a socket, bind it to the FTP port, and start 475 * listening. 476 */ 477 ctl_sock = socket(family, SOCK_STREAM, 0); 478 if (ctl_sock < 0) { 479 syslog(LOG_ERR, "control socket: %m"); 480 exit(1); 481 } 482 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, 483 &on, sizeof(on)) < 0) 484 syslog(LOG_WARNING, 485 "control setsockopt (SO_REUSEADDR): %m"); 486 if (family == AF_INET6 && enable_v4 == 0) { 487 if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY, 488 &on, sizeof (on)) < 0) 489 syslog(LOG_WARNING, 490 "control setsockopt (IPV6_V6ONLY): %m"); 491 } 492 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); 493 if (bind(ctl_sock, (struct sockaddr *)&server_addr, 494 server_addr.su_len) < 0) { 495 syslog(LOG_ERR, "control bind: %m"); 496 exit(1); 497 } 498 if (listen(ctl_sock, 32) < 0) { 499 syslog(LOG_ERR, "control listen: %m"); 500 exit(1); 501 } 502 /* 503 * Atomically write process ID 504 */ 505 if (pid_file) 506 { 507 int fd; 508 char buf[20]; 509 510 fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC 511 | O_NONBLOCK | O_EXLOCK, 0644); 512 if (fd < 0) { 513 if (errno == EAGAIN) 514 errx(1, "%s: file locked", pid_file); 515 else 516 err(1, "%s", pid_file); 517 } 518 snprintf(buf, sizeof(buf), 519 "%lu\n", (unsigned long) getpid()); 520 if (write(fd, buf, strlen(buf)) < 0) 521 err(1, "%s: write", pid_file); 522 /* Leave the pid file open and locked */ 523 } 524 /* 525 * Loop forever accepting connection requests and forking off 526 * children to handle them. 527 */ 528 while (1) { 529 addrlen = server_addr.su_len; 530 fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); 531 if (fork() == 0) { 532 /* child */ 533 (void) dup2(fd, 0); 534 (void) dup2(fd, 1); 535 close(ctl_sock); 536 break; 537 } 538 close(fd); 539 } 540 } else { 541 addrlen = sizeof(his_addr); 542 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 543 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 544 exit(1); 545 } 546 } 547 548 sa.sa_handler = SIG_DFL; 549 (void)sigaction(SIGCHLD, &sa, NULL); 550 551 sa.sa_handler = sigurg; 552 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 553 (void)sigaction(SIGURG, &sa, NULL); 554 555 sigfillset(&sa.sa_mask); /* block all signals in handler */ 556 sa.sa_flags = SA_RESTART; 557 sa.sa_handler = sigquit; 558 (void)sigaction(SIGHUP, &sa, NULL); 559 (void)sigaction(SIGINT, &sa, NULL); 560 (void)sigaction(SIGQUIT, &sa, NULL); 561 (void)sigaction(SIGTERM, &sa, NULL); 562 563 sa.sa_handler = lostconn; 564 (void)sigaction(SIGPIPE, &sa, NULL); 565 566 addrlen = sizeof(ctrl_addr); 567 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 568 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 569 exit(1); 570 } 571 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 572 #ifdef VIRTUAL_HOSTING 573 /* select our identity from virtual host table */ 574 selecthost(&ctrl_addr); 575 #endif 576 #ifdef IP_TOS 577 if (ctrl_addr.su_family == AF_INET) 578 { 579 tos = IPTOS_LOWDELAY; 580 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 581 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 582 } 583 #endif 584 /* 585 * Disable Nagle on the control channel so that we don't have to wait 586 * for peer's ACK before issuing our next reply. 587 */ 588 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 589 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 590 591 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 592 593 /* set this here so klogin can use it... */ 594 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 595 596 /* Try to handle urgent data inline */ 597 #ifdef SO_OOBINLINE 598 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 599 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 600 #endif 601 602 #ifdef F_SETOWN 603 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 604 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 605 #endif 606 dolog((struct sockaddr *)&his_addr); 607 /* 608 * Set up default state 609 */ 610 data = -1; 611 type = TYPE_A; 612 form = FORM_N; 613 stru = STRU_F; 614 mode = MODE_S; 615 tmpline[0] = '\0'; 616 617 /* If logins are disabled, print out the message. */ 618 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 619 while (fgets(line, sizeof(line), fd) != NULL) { 620 if ((cp = strchr(line, '\n')) != NULL) 621 *cp = '\0'; 622 lreply(530, "%s", line); 623 } 624 (void) fflush(stdout); 625 (void) fclose(fd); 626 reply(530, "System not available."); 627 exit(0); 628 } 629 #ifdef VIRTUAL_HOSTING 630 if ((fd = fopen(thishost->welcome, "r")) != NULL) { 631 #else 632 if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { 633 #endif 634 while (fgets(line, sizeof(line), fd) != NULL) { 635 if ((cp = strchr(line, '\n')) != NULL) 636 *cp = '\0'; 637 lreply(220, "%s", line); 638 } 639 (void) fflush(stdout); 640 (void) fclose(fd); 641 /* reply(220,) must follow */ 642 } 643 #ifndef VIRTUAL_HOSTING 644 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 645 fatalerror("Ran out of memory."); 646 (void) gethostname(hostname, MAXHOSTNAMELEN - 1); 647 hostname[MAXHOSTNAMELEN - 1] = '\0'; 648 #endif 649 if (hostinfo) 650 reply(220, "%s FTP server (%s) ready.", hostname, version); 651 else 652 reply(220, "FTP server ready."); 653 for (;;) 654 (void) yyparse(); 655 /* NOTREACHED */ 656 } 657 658 static void 659 lostconn(signo) 660 int signo; 661 { 662 663 if (ftpdebug) 664 syslog(LOG_DEBUG, "lost connection"); 665 dologout(1); 666 } 667 668 static void 669 sigquit(signo) 670 int signo; 671 { 672 673 syslog(LOG_ERR, "got signal %d", signo); 674 dologout(1); 675 } 676 677 #ifdef VIRTUAL_HOSTING 678 /* 679 * read in virtual host tables (if they exist) 680 */ 681 682 static void 683 inithosts() 684 { 685 int insert; 686 size_t len; 687 FILE *fp; 688 char *cp, *mp, *line; 689 char *hostname; 690 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 691 struct ftphost *hrp, *lhrp; 692 struct addrinfo hints, *res, *ai; 693 694 /* 695 * Fill in the default host information 696 */ 697 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 698 fatalerror("Ran out of memory."); 699 if (gethostname(hostname, MAXHOSTNAMELEN) < 0) 700 hostname[0] = '\0'; 701 hostname[MAXHOSTNAMELEN - 1] = '\0'; 702 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 703 fatalerror("Ran out of memory."); 704 hrp->hostname = hostname; 705 hrp->hostinfo = NULL; 706 707 memset(&hints, 0, sizeof(hints)); 708 hints.ai_flags = AI_CANONNAME; 709 hints.ai_family = AF_UNSPEC; 710 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 711 hrp->hostinfo = res; 712 hrp->statfile = _PATH_FTPDSTATFILE; 713 hrp->welcome = _PATH_FTPWELCOME; 714 hrp->loginmsg = _PATH_FTPLOGINMESG; 715 hrp->anonuser = "ftp"; 716 hrp->next = NULL; 717 thishost = firsthost = lhrp = hrp; 718 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 719 int addrsize, gothost; 720 void *addr; 721 struct hostent *hp; 722 723 while ((line = fgetln(fp, &len)) != NULL) { 724 int i, hp_error; 725 726 /* skip comments */ 727 if (line[0] == '#') 728 continue; 729 if (line[len - 1] == '\n') { 730 line[len - 1] = '\0'; 731 mp = NULL; 732 } else { 733 if ((mp = malloc(len + 1)) == NULL) 734 fatalerror("Ran out of memory."); 735 memcpy(mp, line, len); 736 mp[len] = '\0'; 737 line = mp; 738 } 739 cp = strtok(line, " \t"); 740 /* skip empty lines */ 741 if (cp == NULL) 742 goto nextline; 743 vhost = cp; 744 745 /* set defaults */ 746 anonuser = "ftp"; 747 statfile = _PATH_FTPDSTATFILE; 748 welcome = _PATH_FTPWELCOME; 749 loginmsg = _PATH_FTPLOGINMESG; 750 751 /* 752 * Preparse the line so we can use its info 753 * for all the addresses associated with 754 * the virtual host name. 755 * Field 0, the virtual host name, is special: 756 * it's already parsed off and will be strdup'ed 757 * later, after we know its canonical form. 758 */ 759 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 760 if (*cp != '-' && (cp = strdup(cp))) 761 switch (i) { 762 case 1: /* anon user permissions */ 763 anonuser = cp; 764 break; 765 case 2: /* statistics file */ 766 statfile = cp; 767 break; 768 case 3: /* welcome message */ 769 welcome = cp; 770 break; 771 case 4: /* login message */ 772 loginmsg = cp; 773 break; 774 default: /* programming error */ 775 abort(); 776 /* NOTREACHED */ 777 } 778 779 hints.ai_flags = 0; 780 hints.ai_family = AF_UNSPEC; 781 hints.ai_flags = AI_PASSIVE; 782 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 783 goto nextline; 784 for (ai = res; ai != NULL && ai->ai_addr != NULL; 785 ai = ai->ai_next) { 786 787 gothost = 0; 788 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 789 struct addrinfo *hi; 790 791 for (hi = hrp->hostinfo; hi != NULL; 792 hi = hi->ai_next) 793 if (hi->ai_addrlen == ai->ai_addrlen && 794 memcmp(hi->ai_addr, 795 ai->ai_addr, 796 ai->ai_addr->sa_len) == 0) { 797 gothost++; 798 break; 799 } 800 if (gothost) 801 break; 802 } 803 if (hrp == NULL) { 804 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 805 goto nextline; 806 hrp->hostname = NULL; 807 insert = 1; 808 } else { 809 if (hrp->hostinfo && hrp->hostinfo != res) 810 freeaddrinfo(hrp->hostinfo); 811 insert = 0; /* host already in the chain */ 812 } 813 hrp->hostinfo = res; 814 815 /* 816 * determine hostname to use. 817 * force defined name if there is a valid alias 818 * otherwise fallback to primary hostname 819 */ 820 /* XXX: getaddrinfo() can't do alias check */ 821 switch(hrp->hostinfo->ai_family) { 822 case AF_INET: 823 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 824 addrsize = sizeof(struct in_addr); 825 break; 826 case AF_INET6: 827 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 828 addrsize = sizeof(struct in6_addr); 829 break; 830 default: 831 /* should not reach here */ 832 freeaddrinfo(hrp->hostinfo); 833 if (insert) 834 free(hrp); /*not in chain, can free*/ 835 else 836 hrp->hostinfo = NULL; /*mark as blank*/ 837 goto nextline; 838 /* NOTREACHED */ 839 } 840 if ((hp = getipnodebyaddr(addr, addrsize, 841 hrp->hostinfo->ai_family, 842 &hp_error)) != NULL) { 843 if (strcmp(vhost, hp->h_name) != 0) { 844 if (hp->h_aliases == NULL) 845 vhost = hp->h_name; 846 else { 847 i = 0; 848 while (hp->h_aliases[i] && 849 strcmp(vhost, hp->h_aliases[i]) != 0) 850 ++i; 851 if (hp->h_aliases[i] == NULL) 852 vhost = hp->h_name; 853 } 854 } 855 } 856 if (hrp->hostname && 857 strcmp(hrp->hostname, vhost) != 0) { 858 free(hrp->hostname); 859 hrp->hostname = NULL; 860 } 861 if (hrp->hostname == NULL && 862 (hrp->hostname = strdup(vhost)) == NULL) { 863 freeaddrinfo(hrp->hostinfo); 864 hrp->hostinfo = NULL; /* mark as blank */ 865 if (hp) 866 freehostent(hp); 867 goto nextline; 868 } 869 hrp->anonuser = anonuser; 870 hrp->statfile = statfile; 871 hrp->welcome = welcome; 872 hrp->loginmsg = loginmsg; 873 if (insert) { 874 hrp->next = NULL; 875 lhrp->next = hrp; 876 lhrp = hrp; 877 } 878 if (hp) 879 freehostent(hp); 880 } 881 nextline: 882 if (mp) 883 free(mp); 884 } 885 (void) fclose(fp); 886 } 887 } 888 889 static void 890 selecthost(su) 891 union sockunion *su; 892 { 893 struct ftphost *hrp; 894 u_int16_t port; 895 #ifdef INET6 896 struct in6_addr *mapped_in6 = NULL; 897 #endif 898 struct addrinfo *hi; 899 900 #ifdef INET6 901 /* 902 * XXX IPv4 mapped IPv6 addr consideraton, 903 * specified in rfc2373. 904 */ 905 if (su->su_family == AF_INET6 && 906 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 907 mapped_in6 = &su->su_sin6.sin6_addr; 908 #endif 909 910 hrp = thishost = firsthost; /* default */ 911 port = su->su_port; 912 su->su_port = 0; 913 while (hrp != NULL) { 914 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 915 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 916 thishost = hrp; 917 break; 918 } 919 #ifdef INET6 920 /* XXX IPv4 mapped IPv6 addr consideraton */ 921 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 922 (memcmp(&mapped_in6->s6_addr[12], 923 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 924 sizeof(struct in_addr)) == 0)) { 925 thishost = hrp; 926 break; 927 } 928 #endif 929 } 930 hrp = hrp->next; 931 } 932 su->su_port = port; 933 /* setup static variables as appropriate */ 934 hostname = thishost->hostname; 935 ftpuser = thishost->anonuser; 936 } 937 #endif 938 939 /* 940 * Helper function for sgetpwnam(). 941 */ 942 static char * 943 sgetsave(s) 944 char *s; 945 { 946 char *new = malloc((unsigned) strlen(s) + 1); 947 948 if (new == NULL) { 949 perror_reply(421, "Local resource failure: malloc"); 950 dologout(1); 951 /* NOTREACHED */ 952 } 953 (void) strcpy(new, s); 954 return (new); 955 } 956 957 /* 958 * Save the result of a getpwnam. Used for USER command, since 959 * the data returned must not be clobbered by any other command 960 * (e.g., globbing). 961 */ 962 static struct passwd * 963 sgetpwnam(name) 964 char *name; 965 { 966 static struct passwd save; 967 struct passwd *p; 968 969 if ((p = getpwnam(name)) == NULL) 970 return (p); 971 if (save.pw_name) { 972 free(save.pw_name); 973 free(save.pw_passwd); 974 free(save.pw_gecos); 975 free(save.pw_dir); 976 free(save.pw_shell); 977 } 978 save = *p; 979 save.pw_name = sgetsave(p->pw_name); 980 save.pw_passwd = sgetsave(p->pw_passwd); 981 save.pw_gecos = sgetsave(p->pw_gecos); 982 save.pw_dir = sgetsave(p->pw_dir); 983 save.pw_shell = sgetsave(p->pw_shell); 984 return (&save); 985 } 986 987 static int login_attempts; /* number of failed login attempts */ 988 static int askpasswd; /* had user command, ask for passwd */ 989 static char curname[MAXLOGNAME]; /* current USER name */ 990 991 /* 992 * USER command. 993 * Sets global passwd pointer pw if named account exists and is acceptable; 994 * sets askpasswd if a PASS command is expected. If logged in previously, 995 * need to reset state. If name is "ftp" or "anonymous", the name is not in 996 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 997 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 998 * requesting login privileges. Disallow anyone who does not have a standard 999 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1000 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1001 */ 1002 void 1003 user(name) 1004 char *name; 1005 { 1006 char *cp, *shell; 1007 1008 if (logged_in) { 1009 if (guest) { 1010 reply(530, "Can't change user from guest login."); 1011 return; 1012 } else if (dochroot) { 1013 reply(530, "Can't change user from chroot user."); 1014 return; 1015 } 1016 end_login(); 1017 } 1018 1019 guest = 0; 1020 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1021 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) || 1022 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL)) 1023 reply(530, "User %s access denied.", name); 1024 #ifdef VIRTUAL_HOSTING 1025 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { 1026 #else 1027 else if ((pw = sgetpwnam("ftp")) != NULL) { 1028 #endif 1029 guest = 1; 1030 askpasswd = 1; 1031 reply(331, 1032 "Guest login ok, send your email address as password."); 1033 } else 1034 reply(530, "User %s unknown.", name); 1035 if (!askpasswd && logging) 1036 syslog(LOG_NOTICE, 1037 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1038 return; 1039 } 1040 if (anon_only != 0) { 1041 reply(530, "Sorry, only anonymous ftp allowed."); 1042 return; 1043 } 1044 1045 if ((pw = sgetpwnam(name))) { 1046 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1047 shell = _PATH_BSHELL; 1048 while ((cp = getusershell()) != NULL) 1049 if (strcmp(cp, shell) == 0) 1050 break; 1051 endusershell(); 1052 1053 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) { 1054 reply(530, "User %s access denied.", name); 1055 if (logging) 1056 syslog(LOG_NOTICE, 1057 "FTP LOGIN REFUSED FROM %s, %s", 1058 remotehost, name); 1059 pw = (struct passwd *) NULL; 1060 return; 1061 } 1062 } 1063 if (logging) 1064 strncpy(curname, name, sizeof(curname)-1); 1065 #ifdef SKEY 1066 pwok = skeyaccess(name, NULL, remotehost, remotehost); 1067 reply(331, "%s", skey_challenge(name, pw, pwok)); 1068 #else 1069 reply(331, "Password required for %s.", name); 1070 #endif 1071 askpasswd = 1; 1072 /* 1073 * Delay before reading passwd after first failed 1074 * attempt to slow down passwd-guessing programs. 1075 */ 1076 if (login_attempts) 1077 sleep((unsigned) login_attempts); 1078 } 1079 1080 /* 1081 * Check if a user is in the file "fname", 1082 * return a pointer to a malloc'd string with the rest 1083 * of the matching line in "residue" if not NULL. 1084 */ 1085 static int 1086 checkuser(fname, name, pwset, residue) 1087 char *fname; 1088 char *name; 1089 int pwset; 1090 char **residue; 1091 { 1092 FILE *fd; 1093 int found = 0; 1094 size_t len; 1095 char *line, *mp, *p; 1096 1097 if ((fd = fopen(fname, "r")) != NULL) { 1098 while (!found && (line = fgetln(fd, &len)) != NULL) { 1099 /* skip comments */ 1100 if (line[0] == '#') 1101 continue; 1102 if (line[len - 1] == '\n') { 1103 line[len - 1] = '\0'; 1104 mp = NULL; 1105 } else { 1106 if ((mp = malloc(len + 1)) == NULL) 1107 fatalerror("Ran out of memory."); 1108 memcpy(mp, line, len); 1109 mp[len] = '\0'; 1110 line = mp; 1111 } 1112 /* avoid possible leading and trailing whitespace */ 1113 p = strtok(line, " \t"); 1114 /* skip empty lines */ 1115 if (p == NULL) 1116 goto nextline; 1117 /* 1118 * if first chr is '@', check group membership 1119 */ 1120 if (p[0] == '@') { 1121 int i = 0; 1122 struct group *grp; 1123 1124 if (p[1] == '\0') /* single @ matches anyone */ 1125 found = 1; 1126 else { 1127 if ((grp = getgrnam(p+1)) == NULL) 1128 goto nextline; 1129 /* 1130 * Check user's default group 1131 */ 1132 if (pwset && grp->gr_gid == pw->pw_gid) 1133 found = 1; 1134 /* 1135 * Check supplementary groups 1136 */ 1137 while (!found && grp->gr_mem[i]) 1138 found = strcmp(name, 1139 grp->gr_mem[i++]) 1140 == 0; 1141 } 1142 } 1143 /* 1144 * Otherwise, just check for username match 1145 */ 1146 else 1147 found = strcmp(p, name) == 0; 1148 /* 1149 * Save the rest of line to "residue" if matched 1150 */ 1151 if (found && residue) { 1152 if ((p = strtok(NULL, "")) != NULL) 1153 p += strspn(p, " \t"); 1154 if (p && *p) { 1155 if ((*residue = strdup(p)) == NULL) 1156 fatalerror("Ran out of memory."); 1157 } else 1158 *residue = NULL; 1159 } 1160 nextline: 1161 if (mp) 1162 free(mp); 1163 } 1164 (void) fclose(fd); 1165 } 1166 return (found); 1167 } 1168 1169 /* 1170 * Terminate login as previous user, if any, resetting state; 1171 * used when USER command is given or login fails. 1172 */ 1173 static void 1174 end_login() 1175 { 1176 1177 (void) seteuid((uid_t)0); 1178 if (logged_in && dowtmp) 1179 ftpd_logwtmp(ttyline, "", NULL); 1180 pw = NULL; 1181 #ifdef LOGIN_CAP 1182 setusercontext(NULL, getpwuid(0), (uid_t)0, 1183 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1184 #endif 1185 logged_in = 0; 1186 guest = 0; 1187 dochroot = 0; 1188 } 1189 1190 #if !defined(NOPAM) 1191 1192 /* 1193 * the following code is stolen from imap-uw PAM authentication module and 1194 * login.c 1195 */ 1196 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1197 1198 struct cred_t { 1199 const char *uname; /* user name */ 1200 const char *pass; /* password */ 1201 }; 1202 typedef struct cred_t cred_t; 1203 1204 static int 1205 auth_conv(int num_msg, const struct pam_message **msg, 1206 struct pam_response **resp, void *appdata) 1207 { 1208 int i; 1209 cred_t *cred = (cred_t *) appdata; 1210 struct pam_response *reply = 1211 malloc(sizeof(struct pam_response) * num_msg); 1212 1213 for (i = 0; i < num_msg; i++) { 1214 switch (msg[i]->msg_style) { 1215 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1216 reply[i].resp_retcode = PAM_SUCCESS; 1217 reply[i].resp = COPY_STRING(cred->uname); 1218 /* PAM frees resp. */ 1219 break; 1220 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1221 reply[i].resp_retcode = PAM_SUCCESS; 1222 reply[i].resp = COPY_STRING(cred->pass); 1223 /* PAM frees resp. */ 1224 break; 1225 case PAM_TEXT_INFO: 1226 case PAM_ERROR_MSG: 1227 reply[i].resp_retcode = PAM_SUCCESS; 1228 reply[i].resp = NULL; 1229 break; 1230 default: /* unknown message style */ 1231 free(reply); 1232 return PAM_CONV_ERR; 1233 } 1234 } 1235 1236 *resp = reply; 1237 return PAM_SUCCESS; 1238 } 1239 1240 /* 1241 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1242 * authenticated, or 1 if not authenticated. If some sort of PAM system 1243 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1244 * function returns -1. This can be used as an indication that we should 1245 * fall back to a different authentication mechanism. 1246 */ 1247 static int 1248 auth_pam(struct passwd **ppw, const char *pass) 1249 { 1250 pam_handle_t *pamh = NULL; 1251 const char *tmpl_user; 1252 const void *item; 1253 int rval; 1254 int e; 1255 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1256 struct pam_conv conv = { &auth_conv, &auth_cred }; 1257 1258 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1259 if (e != PAM_SUCCESS) { 1260 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); 1261 return -1; 1262 } 1263 1264 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1265 if (e != PAM_SUCCESS) { 1266 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1267 pam_strerror(pamh, e)); 1268 return -1; 1269 } 1270 1271 e = pam_authenticate(pamh, 0); 1272 switch (e) { 1273 case PAM_SUCCESS: 1274 /* 1275 * With PAM we support the concept of a "template" 1276 * user. The user enters a login name which is 1277 * authenticated by PAM, usually via a remote service 1278 * such as RADIUS or TACACS+. If authentication 1279 * succeeds, a different but related "template" name 1280 * is used for setting the credentials, shell, and 1281 * home directory. The name the user enters need only 1282 * exist on the remote authentication server, but the 1283 * template name must be present in the local password 1284 * database. 1285 * 1286 * This is supported by two various mechanisms in the 1287 * individual modules. However, from the application's 1288 * point of view, the template user is always passed 1289 * back as a changed value of the PAM_USER item. 1290 */ 1291 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1292 PAM_SUCCESS) { 1293 tmpl_user = (const char *) item; 1294 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1295 *ppw = getpwnam(tmpl_user); 1296 } else 1297 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1298 pam_strerror(pamh, e)); 1299 rval = 0; 1300 break; 1301 1302 case PAM_AUTH_ERR: 1303 case PAM_USER_UNKNOWN: 1304 case PAM_MAXTRIES: 1305 rval = 1; 1306 break; 1307 1308 default: 1309 syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e)); 1310 rval = -1; 1311 break; 1312 } 1313 1314 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1315 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1316 rval = -1; 1317 } 1318 return rval; 1319 } 1320 1321 #endif /* !defined(NOPAM) */ 1322 1323 void 1324 pass(passwd) 1325 char *passwd; 1326 { 1327 int rval; 1328 FILE *fd; 1329 #ifdef LOGIN_CAP 1330 login_cap_t *lc = NULL; 1331 #endif 1332 char *chrootdir; 1333 char *residue = NULL; 1334 1335 if (logged_in || askpasswd == 0) { 1336 reply(503, "Login with USER first."); 1337 return; 1338 } 1339 askpasswd = 0; 1340 if (!guest) { /* "ftp" is only account allowed no password */ 1341 if (pw == NULL) { 1342 rval = 1; /* failure below */ 1343 goto skip; 1344 } 1345 #if !defined(NOPAM) 1346 rval = auth_pam(&pw, passwd); 1347 if (rval >= 0) 1348 goto skip; 1349 #endif 1350 #ifdef SKEY 1351 if (pwok) 1352 rval = strcmp(pw->pw_passwd, 1353 crypt(passwd, pw->pw_passwd)); 1354 if (rval) 1355 rval = strcmp(pw->pw_passwd, 1356 skey_crypt(passwd, pw->pw_passwd, pw, pwok)); 1357 #else 1358 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd)); 1359 #endif 1360 /* The strcmp does not catch null passwords! */ 1361 if (*pw->pw_passwd == '\0' || 1362 (pw->pw_expire && time(NULL) >= pw->pw_expire)) 1363 rval = 1; /* failure */ 1364 skip: 1365 /* 1366 * If rval == 1, the user failed the authentication check 1367 * above. If rval == 0, either PAM or local authentication 1368 * succeeded. 1369 */ 1370 if (rval) { 1371 reply(530, "Login incorrect."); 1372 if (logging) { 1373 syslog(LOG_NOTICE, 1374 "FTP LOGIN FAILED FROM %s", 1375 remotehost); 1376 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1377 "FTP LOGIN FAILED FROM %s, %s", 1378 remotehost, curname); 1379 } 1380 pw = NULL; 1381 if (login_attempts++ >= 5) { 1382 syslog(LOG_NOTICE, 1383 "repeated login failures from %s", 1384 remotehost); 1385 exit(0); 1386 } 1387 return; 1388 } 1389 } 1390 #ifdef SKEY 1391 pwok = 0; 1392 #endif 1393 login_attempts = 0; /* this time successful */ 1394 if (setegid((gid_t)pw->pw_gid) < 0) { 1395 reply(550, "Can't set gid."); 1396 return; 1397 } 1398 /* May be overridden by login.conf */ 1399 (void) umask(defumask); 1400 #ifdef LOGIN_CAP 1401 if ((lc = login_getpwclass(pw)) != NULL) { 1402 char remote_ip[MAXHOSTNAMELEN]; 1403 1404 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1405 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1406 NI_NUMERICHOST); 1407 remote_ip[sizeof(remote_ip) - 1] = 0; 1408 if (!auth_hostok(lc, remotehost, remote_ip)) { 1409 syslog(LOG_INFO|LOG_AUTH, 1410 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1411 pw->pw_name); 1412 reply(530, "Permission denied.\n"); 1413 pw = NULL; 1414 return; 1415 } 1416 if (!auth_timeok(lc, time(NULL))) { 1417 reply(530, "Login not available right now.\n"); 1418 pw = NULL; 1419 return; 1420 } 1421 } 1422 setusercontext(lc, pw, (uid_t)0, 1423 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1424 LOGIN_SETRESOURCES|LOGIN_SETUMASK); 1425 #else 1426 setlogin(pw->pw_name); 1427 (void) initgroups(pw->pw_name, pw->pw_gid); 1428 #endif 1429 1430 /* open wtmp before chroot */ 1431 if (dowtmp) 1432 ftpd_logwtmp(ttyline, pw->pw_name, 1433 (struct sockaddr *)&his_addr); 1434 logged_in = 1; 1435 1436 if (guest && stats && statfd < 0) 1437 #ifdef VIRTUAL_HOSTING 1438 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) 1439 #else 1440 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) 1441 #endif 1442 stats = 0; 1443 1444 dochroot = 1445 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue) 1446 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1447 || login_getcapbool(lc, "ftp-chroot", 0) 1448 #endif 1449 ; 1450 chrootdir = NULL; 1451 /* 1452 * For a chrooted local user, 1453 * a) see whether ftpchroot(5) specifies a chroot directory, 1454 * b) extract the directory pathname from the line, 1455 * c) expand it to the absolute pathname if necessary. 1456 */ 1457 if (dochroot && residue && 1458 (chrootdir = strtok(residue, " \t")) != NULL && 1459 chrootdir[0] != '/') { 1460 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1461 if (chrootdir == NULL) 1462 fatalerror("Ran out of memory."); 1463 } 1464 if (guest || dochroot) { 1465 /* 1466 * If no chroot directory set yet, use the login directory. 1467 * Copy it so it can be modified while pw->pw_dir stays intact. 1468 */ 1469 if (chrootdir == NULL && 1470 (chrootdir = strdup(pw->pw_dir)) == NULL) 1471 fatalerror("Ran out of memory."); 1472 /* 1473 * Check for the "/chroot/./home" syntax, 1474 * separate the chroot and home directory pathnames. 1475 */ 1476 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1477 *(homedir++) = '\0'; /* wipe '/' */ 1478 homedir++; /* skip '.' */ 1479 /* so chrootdir can be freed later */ 1480 if ((homedir = strdup(homedir)) == NULL) 1481 fatalerror("Ran out of memory."); 1482 } else { 1483 /* 1484 * We MUST do a chdir() after the chroot. Otherwise 1485 * the old current directory will be accessible as "." 1486 * outside the new root! 1487 */ 1488 homedir = "/"; 1489 } 1490 /* 1491 * Finally, do chroot() 1492 */ 1493 if (chroot(chrootdir) < 0) { 1494 reply(550, "Can't change root."); 1495 goto bad; 1496 } 1497 } else /* real user w/o chroot */ 1498 homedir = pw->pw_dir; 1499 /* 1500 * Set euid *before* doing chdir() so 1501 * a) the user won't be carried to a directory that he couldn't reach 1502 * on his own due to no permission to upper path components, 1503 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1504 * (uid 0 has no root power over NFS if not mapped explicitly.) 1505 */ 1506 if (seteuid((uid_t)pw->pw_uid) < 0) { 1507 reply(550, "Can't set uid."); 1508 goto bad; 1509 } 1510 if (chdir(homedir) < 0) { 1511 if (guest || dochroot) { 1512 reply(550, "Can't change to base directory."); 1513 goto bad; 1514 } else { 1515 if (chdir("/") < 0) { 1516 reply(550, "Root is inaccessible."); 1517 goto bad; 1518 } 1519 lreply(230, "No directory! Logging in with home=/"); 1520 } 1521 } 1522 1523 /* 1524 * Display a login message, if it exists. 1525 * N.B. reply(230,) must follow the message. 1526 */ 1527 #ifdef VIRTUAL_HOSTING 1528 if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { 1529 #else 1530 if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { 1531 #endif 1532 char *cp, line[LINE_MAX]; 1533 1534 while (fgets(line, sizeof(line), fd) != NULL) { 1535 if ((cp = strchr(line, '\n')) != NULL) 1536 *cp = '\0'; 1537 lreply(230, "%s", line); 1538 } 1539 (void) fflush(stdout); 1540 (void) fclose(fd); 1541 } 1542 if (guest) { 1543 if (ident != NULL) 1544 free(ident); 1545 ident = strdup(passwd); 1546 if (ident == NULL) 1547 fatalerror("Ran out of memory."); 1548 1549 reply(230, "Guest login ok, access restrictions apply."); 1550 #ifdef SETPROCTITLE 1551 #ifdef VIRTUAL_HOSTING 1552 if (thishost != firsthost) 1553 snprintf(proctitle, sizeof(proctitle), 1554 "%s: anonymous(%s)/%s", remotehost, hostname, 1555 passwd); 1556 else 1557 #endif 1558 snprintf(proctitle, sizeof(proctitle), 1559 "%s: anonymous/%s", remotehost, passwd); 1560 setproctitle("%s", proctitle); 1561 #endif /* SETPROCTITLE */ 1562 if (logging) 1563 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1564 remotehost, passwd); 1565 } else { 1566 if (dochroot) 1567 reply(230, "User %s logged in, " 1568 "access restrictions apply.", pw->pw_name); 1569 else 1570 reply(230, "User %s logged in.", pw->pw_name); 1571 1572 #ifdef SETPROCTITLE 1573 snprintf(proctitle, sizeof(proctitle), 1574 "%s: user/%s", remotehost, pw->pw_name); 1575 setproctitle("%s", proctitle); 1576 #endif /* SETPROCTITLE */ 1577 if (logging) 1578 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1579 remotehost, pw->pw_name); 1580 } 1581 #ifdef LOGIN_CAP 1582 login_close(lc); 1583 #endif 1584 if (chrootdir) 1585 free(chrootdir); 1586 if (residue) 1587 free(residue); 1588 return; 1589 bad: 1590 /* Forget all about it... */ 1591 #ifdef LOGIN_CAP 1592 login_close(lc); 1593 #endif 1594 if (chrootdir) 1595 free(chrootdir); 1596 if (residue) 1597 free(residue); 1598 end_login(); 1599 } 1600 1601 void 1602 retrieve(cmd, name) 1603 char *cmd, *name; 1604 { 1605 FILE *fin, *dout; 1606 struct stat st; 1607 int (*closefunc) (FILE *); 1608 time_t start; 1609 1610 if (cmd == 0) { 1611 fin = fopen(name, "r"), closefunc = fclose; 1612 st.st_size = 0; 1613 } else { 1614 char line[BUFSIZ]; 1615 1616 (void) snprintf(line, sizeof(line), cmd, name), name = line; 1617 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1618 st.st_size = -1; 1619 st.st_blksize = BUFSIZ; 1620 } 1621 if (fin == NULL) { 1622 if (errno != 0) { 1623 perror_reply(550, name); 1624 if (cmd == 0) { 1625 LOGCMD("get", name); 1626 } 1627 } 1628 return; 1629 } 1630 byte_count = -1; 1631 if (cmd == 0) { 1632 if (fstat(fileno(fin), &st) < 0) { 1633 perror_reply(550, name); 1634 goto done; 1635 } 1636 if (!S_ISREG(st.st_mode)) { 1637 if (guest) { 1638 reply(550, "%s: not a plain file.", name); 1639 goto done; 1640 } 1641 st.st_size = -1; 1642 /* st.st_blksize is set for all descriptor types */ 1643 } 1644 } 1645 if (restart_point) { 1646 if (type == TYPE_A) { 1647 off_t i, n; 1648 int c; 1649 1650 n = restart_point; 1651 i = 0; 1652 while (i++ < n) { 1653 if ((c=getc(fin)) == EOF) { 1654 perror_reply(550, name); 1655 goto done; 1656 } 1657 if (c == '\n') 1658 i++; 1659 } 1660 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1661 perror_reply(550, name); 1662 goto done; 1663 } 1664 } 1665 dout = dataconn(name, st.st_size, "w"); 1666 if (dout == NULL) 1667 goto done; 1668 time(&start); 1669 send_data(fin, dout, st.st_blksize, st.st_size, 1670 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1671 if (cmd == 0 && guest && stats) 1672 logxfer(name, st.st_size, start); 1673 (void) fclose(dout); 1674 data = -1; 1675 pdata = -1; 1676 done: 1677 if (cmd == 0) 1678 LOGBYTES("get", name, byte_count); 1679 (*closefunc)(fin); 1680 } 1681 1682 void 1683 store(name, mode, unique) 1684 char *name, *mode; 1685 int unique; 1686 { 1687 int fd; 1688 FILE *fout, *din; 1689 int (*closefunc) (FILE *); 1690 1691 if (*mode == 'a') { /* APPE */ 1692 if (unique) { 1693 /* Programming error */ 1694 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1695 unique = 0; 1696 } 1697 if (guest && noguestmod) { 1698 reply(550, "Appending to existing file denied"); 1699 goto err; 1700 } 1701 restart_point = 0; /* not affected by preceding REST */ 1702 } 1703 if (unique) /* STOU overrides REST */ 1704 restart_point = 0; 1705 if (guest && noguestmod) { 1706 if (restart_point) { /* guest STOR w/REST */ 1707 reply(550, "Modifying existing file denied"); 1708 goto err; 1709 } else /* treat guest STOR as STOU */ 1710 unique = 1; 1711 } 1712 1713 if (restart_point) 1714 mode = "r+"; /* so ASCII manual seek can work */ 1715 if (unique) { 1716 if ((fd = guniquefd(name, &name)) < 0) 1717 goto err; 1718 fout = fdopen(fd, mode); 1719 } else 1720 fout = fopen(name, mode); 1721 closefunc = fclose; 1722 if (fout == NULL) { 1723 perror_reply(553, name); 1724 goto err; 1725 } 1726 byte_count = -1; 1727 if (restart_point) { 1728 if (type == TYPE_A) { 1729 off_t i, n; 1730 int c; 1731 1732 n = restart_point; 1733 i = 0; 1734 while (i++ < n) { 1735 if ((c=getc(fout)) == EOF) { 1736 perror_reply(550, name); 1737 goto done; 1738 } 1739 if (c == '\n') 1740 i++; 1741 } 1742 /* 1743 * We must do this seek to "current" position 1744 * because we are changing from reading to 1745 * writing. 1746 */ 1747 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1748 perror_reply(550, name); 1749 goto done; 1750 } 1751 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1752 perror_reply(550, name); 1753 goto done; 1754 } 1755 } 1756 din = dataconn(name, (off_t)-1, "r"); 1757 if (din == NULL) 1758 goto done; 1759 if (receive_data(din, fout) == 0) { 1760 if (unique) 1761 reply(226, "Transfer complete (unique file name:%s).", 1762 name); 1763 else 1764 reply(226, "Transfer complete."); 1765 } 1766 (void) fclose(din); 1767 data = -1; 1768 pdata = -1; 1769 done: 1770 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1771 (*closefunc)(fout); 1772 return; 1773 err: 1774 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1775 return; 1776 } 1777 1778 static FILE * 1779 getdatasock(mode) 1780 char *mode; 1781 { 1782 int on = 1, s, t, tries; 1783 1784 if (data >= 0) 1785 return (fdopen(data, mode)); 1786 (void) seteuid((uid_t)0); 1787 1788 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1789 if (s < 0) 1790 goto bad; 1791 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1792 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1793 /* anchor socket to avoid multi-homing problems */ 1794 data_source = ctrl_addr; 1795 data_source.su_port = htons(dataport); 1796 for (tries = 1; ; tries++) { 1797 if (bind(s, (struct sockaddr *)&data_source, 1798 data_source.su_len) >= 0) 1799 break; 1800 if (errno != EADDRINUSE || tries > 10) 1801 goto bad; 1802 sleep(tries); 1803 } 1804 (void) seteuid((uid_t)pw->pw_uid); 1805 #ifdef IP_TOS 1806 if (data_source.su_family == AF_INET) 1807 { 1808 on = IPTOS_THROUGHPUT; 1809 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1810 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1811 } 1812 #endif 1813 #ifdef TCP_NOPUSH 1814 /* 1815 * Turn off push flag to keep sender TCP from sending short packets 1816 * at the boundaries of each write(). Should probably do a SO_SNDBUF 1817 * to set the send buffer size as well, but that may not be desirable 1818 * in heavy-load situations. 1819 */ 1820 on = 1; 1821 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1822 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1823 #endif 1824 #ifdef SO_SNDBUF 1825 on = 65536; 1826 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0) 1827 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m"); 1828 #endif 1829 1830 return (fdopen(s, mode)); 1831 bad: 1832 /* Return the real value of errno (close may change it) */ 1833 t = errno; 1834 (void) seteuid((uid_t)pw->pw_uid); 1835 (void) close(s); 1836 errno = t; 1837 return (NULL); 1838 } 1839 1840 static FILE * 1841 dataconn(name, size, mode) 1842 char *name; 1843 off_t size; 1844 char *mode; 1845 { 1846 char sizebuf[32]; 1847 FILE *file; 1848 int retry = 0, tos, conerrno; 1849 1850 file_size = size; 1851 byte_count = 0; 1852 if (size != (off_t) -1) 1853 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); 1854 else 1855 *sizebuf = '\0'; 1856 if (pdata >= 0) { 1857 union sockunion from; 1858 int flags; 1859 int s, fromlen = ctrl_addr.su_len; 1860 struct timeval timeout; 1861 fd_set set; 1862 1863 FD_ZERO(&set); 1864 FD_SET(pdata, &set); 1865 1866 timeout.tv_usec = 0; 1867 timeout.tv_sec = 120; 1868 1869 /* 1870 * Granted a socket is in the blocking I/O mode, 1871 * accept() will block after a successful select() 1872 * if the selected connection dies in between. 1873 * Therefore set the non-blocking I/O flag here. 1874 */ 1875 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1876 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1877 goto pdata_err; 1878 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || 1879 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1880 goto pdata_err; 1881 (void) close(pdata); 1882 pdata = s; 1883 /* 1884 * Unset the inherited non-blocking I/O flag 1885 * on the child socket so stdio can work on it. 1886 */ 1887 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1888 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 1889 goto pdata_err; 1890 #ifdef IP_TOS 1891 if (from.su_family == AF_INET) 1892 { 1893 tos = IPTOS_THROUGHPUT; 1894 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 1895 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 1896 } 1897 #endif 1898 reply(150, "Opening %s mode data connection for '%s'%s.", 1899 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1900 return (fdopen(pdata, mode)); 1901 pdata_err: 1902 reply(425, "Can't open data connection."); 1903 (void) close(pdata); 1904 pdata = -1; 1905 return (NULL); 1906 } 1907 if (data >= 0) { 1908 reply(125, "Using existing data connection for '%s'%s.", 1909 name, sizebuf); 1910 usedefault = 1; 1911 return (fdopen(data, mode)); 1912 } 1913 if (usedefault) 1914 data_dest = his_addr; 1915 usedefault = 1; 1916 do { 1917 file = getdatasock(mode); 1918 if (file == NULL) { 1919 char hostbuf[BUFSIZ], portbuf[BUFSIZ]; 1920 getnameinfo((struct sockaddr *)&data_source, 1921 data_source.su_len, hostbuf, sizeof(hostbuf) - 1, 1922 portbuf, sizeof(portbuf), 1923 NI_NUMERICHOST|NI_NUMERICSERV); 1924 reply(425, "Can't create data socket (%s,%s): %s.", 1925 hostbuf, portbuf, strerror(errno)); 1926 return (NULL); 1927 } 1928 data = fileno(file); 1929 conerrno = 0; 1930 if (connect(data, (struct sockaddr *)&data_dest, 1931 data_dest.su_len) == 0) 1932 break; 1933 conerrno = errno; 1934 (void) fclose(file); 1935 data = -1; 1936 if (conerrno == EADDRINUSE) { 1937 sleep((unsigned) swaitint); 1938 retry += swaitint; 1939 } else { 1940 break; 1941 } 1942 } while (retry <= swaitmax); 1943 if (conerrno != 0) { 1944 perror_reply(425, "Can't build data connection"); 1945 return (NULL); 1946 } 1947 reply(150, "Opening %s mode data connection for '%s'%s.", 1948 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1949 return (file); 1950 } 1951 1952 /* 1953 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1954 * encapsulation of the data subject to Mode, Structure, and Type. 1955 * 1956 * NB: Form isn't handled. 1957 */ 1958 static int 1959 send_data(instr, outstr, blksize, filesize, isreg) 1960 FILE *instr, *outstr; 1961 off_t blksize; 1962 off_t filesize; 1963 int isreg; 1964 { 1965 int c, filefd, netfd; 1966 char *buf; 1967 off_t cnt; 1968 1969 transflag++; 1970 switch (type) { 1971 1972 case TYPE_A: 1973 while ((c = getc(instr)) != EOF) { 1974 if (recvurg) 1975 goto got_oob; 1976 byte_count++; 1977 if (c == '\n') { 1978 if (ferror(outstr)) 1979 goto data_err; 1980 (void) putc('\r', outstr); 1981 } 1982 (void) putc(c, outstr); 1983 } 1984 if (recvurg) 1985 goto got_oob; 1986 fflush(outstr); 1987 transflag = 0; 1988 if (ferror(instr)) 1989 goto file_err; 1990 if (ferror(outstr)) 1991 goto data_err; 1992 reply(226, "Transfer complete."); 1993 return (0); 1994 1995 case TYPE_I: 1996 case TYPE_L: 1997 /* 1998 * isreg is only set if we are not doing restart and we 1999 * are sending a regular file 2000 */ 2001 netfd = fileno(outstr); 2002 filefd = fileno(instr); 2003 2004 if (isreg) { 2005 2006 off_t offset; 2007 int err; 2008 2009 err = cnt = offset = 0; 2010 2011 while (err != -1 && filesize > 0) { 2012 err = sendfile(filefd, netfd, offset, 0, 2013 (struct sf_hdtr *) NULL, &cnt, 0); 2014 /* 2015 * Calculate byte_count before OOB processing. 2016 * It can be used in myoob() later. 2017 */ 2018 byte_count += cnt; 2019 if (recvurg) 2020 goto got_oob; 2021 offset += cnt; 2022 filesize -= cnt; 2023 2024 if (err == -1) { 2025 if (!cnt) 2026 goto oldway; 2027 2028 goto data_err; 2029 } 2030 } 2031 2032 transflag = 0; 2033 reply(226, "Transfer complete."); 2034 return (0); 2035 } 2036 2037 oldway: 2038 if ((buf = malloc((u_int)blksize)) == NULL) { 2039 transflag = 0; 2040 perror_reply(451, "Local resource failure: malloc"); 2041 return (-1); 2042 } 2043 2044 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && 2045 write(netfd, buf, cnt) == cnt) 2046 byte_count += cnt; 2047 transflag = 0; 2048 (void)free(buf); 2049 if (cnt != 0) { 2050 if (cnt < 0) 2051 goto file_err; 2052 goto data_err; 2053 } 2054 reply(226, "Transfer complete."); 2055 return (0); 2056 default: 2057 transflag = 0; 2058 reply(550, "Unimplemented TYPE %d in send_data", type); 2059 return (-1); 2060 } 2061 2062 data_err: 2063 transflag = 0; 2064 perror_reply(426, "Data connection"); 2065 return (-1); 2066 2067 file_err: 2068 transflag = 0; 2069 perror_reply(551, "Error on input file"); 2070 return (-1); 2071 2072 got_oob: 2073 myoob(); 2074 recvurg = 0; 2075 transflag = 0; 2076 return (-1); 2077 } 2078 2079 /* 2080 * Transfer data from peer to "outstr" using the appropriate encapulation of 2081 * the data subject to Mode, Structure, and Type. 2082 * 2083 * N.B.: Form isn't handled. 2084 */ 2085 static int 2086 receive_data(instr, outstr) 2087 FILE *instr, *outstr; 2088 { 2089 int c; 2090 int cnt, bare_lfs; 2091 char buf[BUFSIZ]; 2092 2093 transflag++; 2094 bare_lfs = 0; 2095 2096 switch (type) { 2097 2098 case TYPE_I: 2099 case TYPE_L: 2100 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { 2101 if (recvurg) 2102 goto got_oob; 2103 if (write(fileno(outstr), buf, cnt) != cnt) 2104 goto file_err; 2105 byte_count += cnt; 2106 } 2107 if (recvurg) 2108 goto got_oob; 2109 if (cnt < 0) 2110 goto data_err; 2111 transflag = 0; 2112 return (0); 2113 2114 case TYPE_E: 2115 reply(553, "TYPE E not implemented."); 2116 transflag = 0; 2117 return (-1); 2118 2119 case TYPE_A: 2120 while ((c = getc(instr)) != EOF) { 2121 if (recvurg) 2122 goto got_oob; 2123 byte_count++; 2124 if (c == '\n') 2125 bare_lfs++; 2126 while (c == '\r') { 2127 if (ferror(outstr)) 2128 goto data_err; 2129 if ((c = getc(instr)) != '\n') { 2130 (void) putc ('\r', outstr); 2131 if (c == '\0' || c == EOF) 2132 goto contin2; 2133 } 2134 } 2135 (void) putc(c, outstr); 2136 contin2: ; 2137 } 2138 if (recvurg) 2139 goto got_oob; 2140 fflush(outstr); 2141 if (ferror(instr)) 2142 goto data_err; 2143 if (ferror(outstr)) 2144 goto file_err; 2145 transflag = 0; 2146 if (bare_lfs) { 2147 lreply(226, 2148 "WARNING! %d bare linefeeds received in ASCII mode", 2149 bare_lfs); 2150 (void)printf(" File may not have transferred correctly.\r\n"); 2151 } 2152 return (0); 2153 default: 2154 reply(550, "Unimplemented TYPE %d in receive_data", type); 2155 transflag = 0; 2156 return (-1); 2157 } 2158 2159 data_err: 2160 transflag = 0; 2161 perror_reply(426, "Data Connection"); 2162 return (-1); 2163 2164 file_err: 2165 transflag = 0; 2166 perror_reply(452, "Error writing file"); 2167 return (-1); 2168 2169 got_oob: 2170 myoob(); 2171 recvurg = 0; 2172 transflag = 0; 2173 return (-1); 2174 } 2175 2176 void 2177 statfilecmd(filename) 2178 char *filename; 2179 { 2180 FILE *fin; 2181 int atstart; 2182 int c; 2183 char line[LINE_MAX]; 2184 2185 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2186 fin = ftpd_popen(line, "r"); 2187 lreply(211, "status of %s:", filename); 2188 atstart = 1; 2189 while ((c = getc(fin)) != EOF) { 2190 if (c == '\n') { 2191 if (ferror(stdout)){ 2192 perror_reply(421, "control connection"); 2193 (void) ftpd_pclose(fin); 2194 dologout(1); 2195 /* NOTREACHED */ 2196 } 2197 if (ferror(fin)) { 2198 perror_reply(551, filename); 2199 (void) ftpd_pclose(fin); 2200 return; 2201 } 2202 (void) putc('\r', stdout); 2203 } 2204 /* 2205 * RFC 959 says neutral text should be prepended before 2206 * a leading 3-digit number followed by whitespace, but 2207 * many ftp clients can be confused by any leading digits, 2208 * as a matter of fact. 2209 */ 2210 if (atstart && isdigit(c)) 2211 (void) putc(' ', stdout); 2212 (void) putc(c, stdout); 2213 atstart = (c == '\n'); 2214 } 2215 (void) ftpd_pclose(fin); 2216 reply(211, "End of Status"); 2217 } 2218 2219 void 2220 statcmd() 2221 { 2222 union sockunion *su; 2223 u_char *a, *p; 2224 char hname[NI_MAXHOST]; 2225 int ispassive; 2226 2227 if (hostinfo) { 2228 lreply(211, "%s FTP server status:", hostname); 2229 printf(" %s\r\n", version); 2230 } else 2231 lreply(211, "FTP server status:"); 2232 printf(" Connected to %s", remotehost); 2233 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2234 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2235 if (strcmp(hname, remotehost) != 0) 2236 printf(" (%s)", hname); 2237 } 2238 printf("\r\n"); 2239 if (logged_in) { 2240 if (guest) 2241 printf(" Logged in anonymously\r\n"); 2242 else 2243 printf(" Logged in as %s\r\n", pw->pw_name); 2244 } else if (askpasswd) 2245 printf(" Waiting for password\r\n"); 2246 else 2247 printf(" Waiting for user name\r\n"); 2248 printf(" TYPE: %s", typenames[type]); 2249 if (type == TYPE_A || type == TYPE_E) 2250 printf(", FORM: %s", formnames[form]); 2251 if (type == TYPE_L) 2252 #if NBBY == 8 2253 printf(" %d", NBBY); 2254 #else 2255 printf(" %d", bytesize); /* need definition! */ 2256 #endif 2257 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2258 strunames[stru], modenames[mode]); 2259 if (data != -1) 2260 printf(" Data connection open\r\n"); 2261 else if (pdata != -1) { 2262 ispassive = 1; 2263 su = &pasv_addr; 2264 goto printaddr; 2265 } else if (usedefault == 0) { 2266 ispassive = 0; 2267 su = &data_dest; 2268 printaddr: 2269 #define UC(b) (((int) b) & 0xff) 2270 if (epsvall) { 2271 printf(" EPSV only mode (EPSV ALL)\r\n"); 2272 goto epsvonly; 2273 } 2274 2275 /* PORT/PASV */ 2276 if (su->su_family == AF_INET) { 2277 a = (u_char *) &su->su_sin.sin_addr; 2278 p = (u_char *) &su->su_sin.sin_port; 2279 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2280 ispassive ? "PASV" : "PORT", 2281 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2282 UC(p[0]), UC(p[1])); 2283 } 2284 2285 /* LPRT/LPSV */ 2286 { 2287 int alen, af, i; 2288 2289 switch (su->su_family) { 2290 case AF_INET: 2291 a = (u_char *) &su->su_sin.sin_addr; 2292 p = (u_char *) &su->su_sin.sin_port; 2293 alen = sizeof(su->su_sin.sin_addr); 2294 af = 4; 2295 break; 2296 case AF_INET6: 2297 a = (u_char *) &su->su_sin6.sin6_addr; 2298 p = (u_char *) &su->su_sin6.sin6_port; 2299 alen = sizeof(su->su_sin6.sin6_addr); 2300 af = 6; 2301 break; 2302 default: 2303 af = 0; 2304 break; 2305 } 2306 if (af) { 2307 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2308 af, alen); 2309 for (i = 0; i < alen; i++) 2310 printf("%d,", UC(a[i])); 2311 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2312 } 2313 } 2314 2315 epsvonly:; 2316 /* EPRT/EPSV */ 2317 { 2318 int af; 2319 2320 switch (su->su_family) { 2321 case AF_INET: 2322 af = 1; 2323 break; 2324 case AF_INET6: 2325 af = 2; 2326 break; 2327 default: 2328 af = 0; 2329 break; 2330 } 2331 if (af) { 2332 union sockunion tmp; 2333 2334 tmp = *su; 2335 if (tmp.su_family == AF_INET6) 2336 tmp.su_sin6.sin6_scope_id = 0; 2337 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2338 hname, sizeof(hname) - 1, NULL, 0, 2339 NI_NUMERICHOST)) { 2340 printf(" %s |%d|%s|%d|\r\n", 2341 ispassive ? "EPSV" : "EPRT", 2342 af, hname, htons(tmp.su_port)); 2343 } 2344 } 2345 } 2346 #undef UC 2347 } else 2348 printf(" No data connection\r\n"); 2349 reply(211, "End of status"); 2350 } 2351 2352 void 2353 fatalerror(s) 2354 char *s; 2355 { 2356 2357 reply(451, "Error in server: %s\n", s); 2358 reply(221, "Closing connection due to server error."); 2359 dologout(0); 2360 /* NOTREACHED */ 2361 } 2362 2363 void 2364 #if __STDC__ 2365 reply(int n, const char *fmt, ...) 2366 #else 2367 reply(n, fmt, va_alist) 2368 int n; 2369 char *fmt; 2370 va_dcl 2371 #endif 2372 { 2373 va_list ap; 2374 #if __STDC__ 2375 va_start(ap, fmt); 2376 #else 2377 va_start(ap); 2378 #endif 2379 (void)printf("%d ", n); 2380 (void)vprintf(fmt, ap); 2381 (void)printf("\r\n"); 2382 (void)fflush(stdout); 2383 if (ftpdebug) { 2384 syslog(LOG_DEBUG, "<--- %d ", n); 2385 vsyslog(LOG_DEBUG, fmt, ap); 2386 } 2387 } 2388 2389 void 2390 #if __STDC__ 2391 lreply(int n, const char *fmt, ...) 2392 #else 2393 lreply(n, fmt, va_alist) 2394 int n; 2395 char *fmt; 2396 va_dcl 2397 #endif 2398 { 2399 va_list ap; 2400 #if __STDC__ 2401 va_start(ap, fmt); 2402 #else 2403 va_start(ap); 2404 #endif 2405 (void)printf("%d- ", n); 2406 (void)vprintf(fmt, ap); 2407 (void)printf("\r\n"); 2408 (void)fflush(stdout); 2409 if (ftpdebug) { 2410 syslog(LOG_DEBUG, "<--- %d- ", n); 2411 vsyslog(LOG_DEBUG, fmt, ap); 2412 } 2413 } 2414 2415 static void 2416 ack(s) 2417 char *s; 2418 { 2419 2420 reply(250, "%s command successful.", s); 2421 } 2422 2423 void 2424 nack(s) 2425 char *s; 2426 { 2427 2428 reply(502, "%s command not implemented.", s); 2429 } 2430 2431 /* ARGSUSED */ 2432 void 2433 yyerror(s) 2434 char *s; 2435 { 2436 char *cp; 2437 2438 if ((cp = strchr(cbuf,'\n'))) 2439 *cp = '\0'; 2440 reply(500, "'%s': command not understood.", cbuf); 2441 } 2442 2443 void 2444 delete(name) 2445 char *name; 2446 { 2447 struct stat st; 2448 2449 LOGCMD("delete", name); 2450 if (lstat(name, &st) < 0) { 2451 perror_reply(550, name); 2452 return; 2453 } 2454 if ((st.st_mode&S_IFMT) == S_IFDIR) { 2455 if (rmdir(name) < 0) { 2456 perror_reply(550, name); 2457 return; 2458 } 2459 goto done; 2460 } 2461 if (unlink(name) < 0) { 2462 perror_reply(550, name); 2463 return; 2464 } 2465 done: 2466 ack("DELE"); 2467 } 2468 2469 void 2470 cwd(path) 2471 char *path; 2472 { 2473 2474 if (chdir(path) < 0) 2475 perror_reply(550, path); 2476 else 2477 ack("CWD"); 2478 } 2479 2480 void 2481 makedir(name) 2482 char *name; 2483 { 2484 char *s; 2485 2486 LOGCMD("mkdir", name); 2487 if (guest && noguestmkd) 2488 reply(550, "%s: permission denied", name); 2489 else if (mkdir(name, 0777) < 0) 2490 perror_reply(550, name); 2491 else { 2492 if ((s = doublequote(name)) == NULL) 2493 fatalerror("Ran out of memory."); 2494 reply(257, "\"%s\" directory created.", s); 2495 free(s); 2496 } 2497 } 2498 2499 void 2500 removedir(name) 2501 char *name; 2502 { 2503 2504 LOGCMD("rmdir", name); 2505 if (rmdir(name) < 0) 2506 perror_reply(550, name); 2507 else 2508 ack("RMD"); 2509 } 2510 2511 void 2512 pwd() 2513 { 2514 char *s, path[MAXPATHLEN + 1]; 2515 2516 if (getwd(path) == (char *)NULL) 2517 reply(550, "%s.", path); 2518 else { 2519 if ((s = doublequote(path)) == NULL) 2520 fatalerror("Ran out of memory."); 2521 reply(257, "\"%s\" is current directory.", s); 2522 free(s); 2523 } 2524 } 2525 2526 char * 2527 renamefrom(name) 2528 char *name; 2529 { 2530 struct stat st; 2531 2532 if (lstat(name, &st) < 0) { 2533 perror_reply(550, name); 2534 return ((char *)0); 2535 } 2536 reply(350, "File exists, ready for destination name"); 2537 return (name); 2538 } 2539 2540 void 2541 renamecmd(from, to) 2542 char *from, *to; 2543 { 2544 struct stat st; 2545 2546 LOGCMD2("rename", from, to); 2547 2548 if (guest && (stat(to, &st) == 0)) { 2549 reply(550, "%s: permission denied", to); 2550 return; 2551 } 2552 2553 if (rename(from, to) < 0) 2554 perror_reply(550, "rename"); 2555 else 2556 ack("RNTO"); 2557 } 2558 2559 static void 2560 dolog(who) 2561 struct sockaddr *who; 2562 { 2563 int error; 2564 2565 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2566 2567 #ifdef SETPROCTITLE 2568 #ifdef VIRTUAL_HOSTING 2569 if (thishost != firsthost) 2570 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2571 remotehost, hostname); 2572 else 2573 #endif 2574 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2575 remotehost); 2576 setproctitle("%s", proctitle); 2577 #endif /* SETPROCTITLE */ 2578 2579 if (logging) { 2580 #ifdef VIRTUAL_HOSTING 2581 if (thishost != firsthost) 2582 syslog(LOG_INFO, "connection from %s (to %s)", 2583 remotehost, hostname); 2584 else 2585 #endif 2586 { 2587 char who_name[MAXHOSTNAMELEN]; 2588 2589 error = getnameinfo(who, who->sa_len, 2590 who_name, sizeof(who_name) - 1, 2591 NULL, 0, NI_NUMERICHOST); 2592 syslog(LOG_INFO, "connection from %s (%s)", remotehost, 2593 error == 0 ? who_name : ""); 2594 } 2595 } 2596 } 2597 2598 /* 2599 * Record logout in wtmp file 2600 * and exit with supplied status. 2601 */ 2602 void 2603 dologout(status) 2604 int status; 2605 { 2606 /* 2607 * Prevent reception of SIGURG from resulting in a resumption 2608 * back to the main program loop. 2609 */ 2610 transflag = 0; 2611 2612 if (logged_in && dowtmp) { 2613 (void) seteuid((uid_t)0); 2614 ftpd_logwtmp(ttyline, "", NULL); 2615 } 2616 /* beware of flushing buffers after a SIGPIPE */ 2617 _exit(status); 2618 } 2619 2620 static void 2621 sigurg(signo) 2622 int signo; 2623 { 2624 2625 recvurg = 1; 2626 } 2627 2628 static void 2629 myoob() 2630 { 2631 char *cp; 2632 2633 /* only process if transfer occurring */ 2634 if (!transflag) 2635 return; 2636 cp = tmpline; 2637 if (getline(cp, 7, stdin) == NULL) { 2638 reply(221, "You could at least say goodbye."); 2639 dologout(0); 2640 } 2641 upper(cp); 2642 if (strcmp(cp, "ABOR\r\n") == 0) { 2643 tmpline[0] = '\0'; 2644 reply(426, "Transfer aborted. Data connection closed."); 2645 reply(226, "Abort successful"); 2646 } 2647 if (strcmp(cp, "STAT\r\n") == 0) { 2648 tmpline[0] = '\0'; 2649 if (file_size != (off_t) -1) 2650 reply(213, "Status: %qd of %qd bytes transferred", 2651 byte_count, file_size); 2652 else 2653 reply(213, "Status: %qd bytes transferred", byte_count); 2654 } 2655 } 2656 2657 /* 2658 * Note: a response of 425 is not mentioned as a possible response to 2659 * the PASV command in RFC959. However, it has been blessed as 2660 * a legitimate response by Jon Postel in a telephone conversation 2661 * with Rick Adams on 25 Jan 89. 2662 */ 2663 void 2664 passive() 2665 { 2666 int len, on; 2667 char *p, *a; 2668 2669 if (pdata >= 0) /* close old port if one set */ 2670 close(pdata); 2671 2672 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2673 if (pdata < 0) { 2674 perror_reply(425, "Can't open passive connection"); 2675 return; 2676 } 2677 on = 1; 2678 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2679 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2680 2681 (void) seteuid((uid_t)0); 2682 2683 #ifdef IP_PORTRANGE 2684 if (ctrl_addr.su_family == AF_INET) { 2685 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2686 : IP_PORTRANGE_DEFAULT; 2687 2688 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2689 &on, sizeof(on)) < 0) 2690 goto pasv_error; 2691 } 2692 #endif 2693 #ifdef IPV6_PORTRANGE 2694 if (ctrl_addr.su_family == AF_INET6) { 2695 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2696 : IPV6_PORTRANGE_DEFAULT; 2697 2698 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2699 &on, sizeof(on)) < 0) 2700 goto pasv_error; 2701 } 2702 #endif 2703 2704 pasv_addr = ctrl_addr; 2705 pasv_addr.su_port = 0; 2706 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2707 goto pasv_error; 2708 2709 (void) seteuid((uid_t)pw->pw_uid); 2710 2711 len = sizeof(pasv_addr); 2712 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2713 goto pasv_error; 2714 if (listen(pdata, 1) < 0) 2715 goto pasv_error; 2716 if (pasv_addr.su_family == AF_INET) 2717 a = (char *) &pasv_addr.su_sin.sin_addr; 2718 else if (pasv_addr.su_family == AF_INET6 && 2719 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2720 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2721 else 2722 goto pasv_error; 2723 2724 p = (char *) &pasv_addr.su_port; 2725 2726 #define UC(b) (((int) b) & 0xff) 2727 2728 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2729 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2730 return; 2731 2732 pasv_error: 2733 (void) seteuid((uid_t)pw->pw_uid); 2734 (void) close(pdata); 2735 pdata = -1; 2736 perror_reply(425, "Can't open passive connection"); 2737 return; 2738 } 2739 2740 /* 2741 * Long Passive defined in RFC 1639. 2742 * 228 Entering Long Passive Mode 2743 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2744 */ 2745 2746 void 2747 long_passive(cmd, pf) 2748 char *cmd; 2749 int pf; 2750 { 2751 int len, on; 2752 char *p, *a; 2753 2754 if (pdata >= 0) /* close old port if one set */ 2755 close(pdata); 2756 2757 if (pf != PF_UNSPEC) { 2758 if (ctrl_addr.su_family != pf) { 2759 switch (ctrl_addr.su_family) { 2760 case AF_INET: 2761 pf = 1; 2762 break; 2763 case AF_INET6: 2764 pf = 2; 2765 break; 2766 default: 2767 pf = 0; 2768 break; 2769 } 2770 /* 2771 * XXX 2772 * only EPRT/EPSV ready clients will understand this 2773 */ 2774 if (strcmp(cmd, "EPSV") == 0 && pf) { 2775 reply(522, "Network protocol mismatch, " 2776 "use (%d)", pf); 2777 } else 2778 reply(501, "Network protocol mismatch"); /*XXX*/ 2779 2780 return; 2781 } 2782 } 2783 2784 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2785 if (pdata < 0) { 2786 perror_reply(425, "Can't open passive connection"); 2787 return; 2788 } 2789 on = 1; 2790 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2791 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2792 2793 (void) seteuid((uid_t)0); 2794 2795 pasv_addr = ctrl_addr; 2796 pasv_addr.su_port = 0; 2797 len = pasv_addr.su_len; 2798 2799 #ifdef IP_PORTRANGE 2800 if (ctrl_addr.su_family == AF_INET) { 2801 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2802 : IP_PORTRANGE_DEFAULT; 2803 2804 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2805 &on, sizeof(on)) < 0) 2806 goto pasv_error; 2807 } 2808 #endif 2809 #ifdef IPV6_PORTRANGE 2810 if (ctrl_addr.su_family == AF_INET6) { 2811 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2812 : IPV6_PORTRANGE_DEFAULT; 2813 2814 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2815 &on, sizeof(on)) < 0) 2816 goto pasv_error; 2817 } 2818 #endif 2819 2820 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 2821 goto pasv_error; 2822 2823 (void) seteuid((uid_t)pw->pw_uid); 2824 2825 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2826 goto pasv_error; 2827 if (listen(pdata, 1) < 0) 2828 goto pasv_error; 2829 2830 #define UC(b) (((int) b) & 0xff) 2831 2832 if (strcmp(cmd, "LPSV") == 0) { 2833 p = (char *)&pasv_addr.su_port; 2834 switch (pasv_addr.su_family) { 2835 case AF_INET: 2836 a = (char *) &pasv_addr.su_sin.sin_addr; 2837 v4_reply: 2838 reply(228, 2839 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2840 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2841 2, UC(p[0]), UC(p[1])); 2842 return; 2843 case AF_INET6: 2844 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 2845 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2846 goto v4_reply; 2847 } 2848 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2849 reply(228, 2850 "Entering Long Passive Mode " 2851 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2852 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2853 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2854 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2855 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2856 2, UC(p[0]), UC(p[1])); 2857 return; 2858 } 2859 } else if (strcmp(cmd, "EPSV") == 0) { 2860 switch (pasv_addr.su_family) { 2861 case AF_INET: 2862 case AF_INET6: 2863 reply(229, "Entering Extended Passive Mode (|||%d|)", 2864 ntohs(pasv_addr.su_port)); 2865 return; 2866 } 2867 } else { 2868 /* more proper error code? */ 2869 } 2870 2871 pasv_error: 2872 (void) seteuid((uid_t)pw->pw_uid); 2873 (void) close(pdata); 2874 pdata = -1; 2875 perror_reply(425, "Can't open passive connection"); 2876 return; 2877 } 2878 2879 /* 2880 * Generate unique name for file with basename "local" 2881 * and open the file in order to avoid possible races. 2882 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 2883 * Return descriptor to the file, set "name" to its name. 2884 * 2885 * Generates failure reply on error. 2886 */ 2887 static int 2888 guniquefd(local, name) 2889 char *local; 2890 char **name; 2891 { 2892 static char new[MAXPATHLEN]; 2893 struct stat st; 2894 char *cp; 2895 int count; 2896 int fd; 2897 2898 cp = strrchr(local, '/'); 2899 if (cp) 2900 *cp = '\0'; 2901 if (stat(cp ? local : ".", &st) < 0) { 2902 perror_reply(553, cp ? local : "."); 2903 return (-1); 2904 } 2905 if (cp) { 2906 /* 2907 * Let not overwrite dirname with counter suffix. 2908 * -4 is for /nn\0 2909 * In this extreme case dot won't be put in front of suffix. 2910 */ 2911 if (strlen(local) > sizeof(new) - 4) { 2912 reply(553, "Pathname too long"); 2913 return (-1); 2914 } 2915 *cp = '/'; 2916 } 2917 /* -4 is for the .nn<null> we put on the end below */ 2918 (void) snprintf(new, sizeof(new) - 4, "%s", local); 2919 cp = new + strlen(new); 2920 /* 2921 * Don't generate dotfile unless requested explicitly. 2922 * This covers the case when basename gets truncated off 2923 * by buffer size. 2924 */ 2925 if (cp > new && cp[-1] != '/') 2926 *cp++ = '.'; 2927 for (count = 0; count < 100; count++) { 2928 /* At count 0 try unmodified name */ 2929 if (count) 2930 (void)sprintf(cp, "%d", count); 2931 if ((fd = open(count ? new : local, 2932 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 2933 *name = count ? new : local; 2934 return (fd); 2935 } 2936 if (errno != EEXIST) { 2937 perror_reply(553, count ? new : local); 2938 return (-1); 2939 } 2940 } 2941 reply(452, "Unique file name cannot be created."); 2942 return (-1); 2943 } 2944 2945 /* 2946 * Format and send reply containing system error number. 2947 */ 2948 void 2949 perror_reply(code, string) 2950 int code; 2951 char *string; 2952 { 2953 2954 reply(code, "%s: %s.", string, strerror(errno)); 2955 } 2956 2957 static char *onefile[] = { 2958 "", 2959 0 2960 }; 2961 2962 void 2963 send_file_list(whichf) 2964 char *whichf; 2965 { 2966 struct stat st; 2967 DIR *dirp = NULL; 2968 struct dirent *dir; 2969 FILE *dout = NULL; 2970 char **dirlist, *dirname; 2971 int simple = 0; 2972 int freeglob = 0; 2973 glob_t gl; 2974 2975 if (strpbrk(whichf, "~{[*?") != NULL) { 2976 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 2977 2978 memset(&gl, 0, sizeof(gl)); 2979 gl.gl_matchc = MAXGLOBARGS; 2980 flags |= GLOB_LIMIT; 2981 freeglob = 1; 2982 if (glob(whichf, flags, 0, &gl)) { 2983 reply(550, "not found"); 2984 goto out; 2985 } else if (gl.gl_pathc == 0) { 2986 errno = ENOENT; 2987 perror_reply(550, whichf); 2988 goto out; 2989 } 2990 dirlist = gl.gl_pathv; 2991 } else { 2992 onefile[0] = whichf; 2993 dirlist = onefile; 2994 simple = 1; 2995 } 2996 2997 while ((dirname = *dirlist++)) { 2998 if (stat(dirname, &st) < 0) { 2999 /* 3000 * If user typed "ls -l", etc, and the client 3001 * used NLST, do what the user meant. 3002 */ 3003 if (dirname[0] == '-' && *dirlist == NULL && 3004 transflag == 0) { 3005 retrieve(_PATH_LS " %s", dirname); 3006 goto out; 3007 } 3008 perror_reply(550, whichf); 3009 if (dout != NULL) { 3010 (void) fclose(dout); 3011 transflag = 0; 3012 data = -1; 3013 pdata = -1; 3014 } 3015 goto out; 3016 } 3017 3018 if (S_ISREG(st.st_mode)) { 3019 if (dout == NULL) { 3020 dout = dataconn("file list", (off_t)-1, "w"); 3021 if (dout == NULL) 3022 goto out; 3023 transflag++; 3024 } 3025 fprintf(dout, "%s%s\n", dirname, 3026 type == TYPE_A ? "\r" : ""); 3027 byte_count += strlen(dirname) + 1; 3028 continue; 3029 } else if (!S_ISDIR(st.st_mode)) 3030 continue; 3031 3032 if ((dirp = opendir(dirname)) == NULL) 3033 continue; 3034 3035 while ((dir = readdir(dirp)) != NULL) { 3036 char nbuf[MAXPATHLEN]; 3037 3038 if (recvurg) { 3039 myoob(); 3040 recvurg = 0; 3041 transflag = 0; 3042 goto out; 3043 } 3044 3045 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3046 continue; 3047 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3048 dir->d_namlen == 2) 3049 continue; 3050 3051 snprintf(nbuf, sizeof(nbuf), 3052 "%s/%s", dirname, dir->d_name); 3053 3054 /* 3055 * We have to do a stat to insure it's 3056 * not a directory or special file. 3057 */ 3058 if (simple || (stat(nbuf, &st) == 0 && 3059 S_ISREG(st.st_mode))) { 3060 if (dout == NULL) { 3061 dout = dataconn("file list", (off_t)-1, 3062 "w"); 3063 if (dout == NULL) 3064 goto out; 3065 transflag++; 3066 } 3067 if (nbuf[0] == '.' && nbuf[1] == '/') 3068 fprintf(dout, "%s%s\n", &nbuf[2], 3069 type == TYPE_A ? "\r" : ""); 3070 else 3071 fprintf(dout, "%s%s\n", nbuf, 3072 type == TYPE_A ? "\r" : ""); 3073 byte_count += strlen(nbuf) + 1; 3074 } 3075 } 3076 (void) closedir(dirp); 3077 } 3078 3079 if (dout == NULL) 3080 reply(550, "No files found."); 3081 else if (ferror(dout) != 0) 3082 perror_reply(550, "Data connection"); 3083 else 3084 reply(226, "Transfer complete."); 3085 3086 transflag = 0; 3087 if (dout != NULL) 3088 (void) fclose(dout); 3089 data = -1; 3090 pdata = -1; 3091 out: 3092 if (freeglob) { 3093 freeglob = 0; 3094 globfree(&gl); 3095 } 3096 } 3097 3098 void 3099 reapchild(signo) 3100 int signo; 3101 { 3102 while (wait3(NULL, WNOHANG, NULL) > 0); 3103 } 3104 3105 #ifdef OLD_SETPROCTITLE 3106 /* 3107 * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) 3108 * Warning, since this is usually started from inetd.conf, it often doesn't 3109 * have much of an environment or arglist to overwrite. 3110 */ 3111 void 3112 #if __STDC__ 3113 setproctitle(const char *fmt, ...) 3114 #else 3115 setproctitle(fmt, va_alist) 3116 char *fmt; 3117 va_dcl 3118 #endif 3119 { 3120 int i; 3121 va_list ap; 3122 char *p, *bp, ch; 3123 char buf[LINE_MAX]; 3124 3125 #if __STDC__ 3126 va_start(ap, fmt); 3127 #else 3128 va_start(ap); 3129 #endif 3130 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 3131 3132 /* make ps print our process name */ 3133 p = Argv[0]; 3134 *p++ = '-'; 3135 3136 i = strlen(buf); 3137 if (i > LastArgv - p - 2) { 3138 i = LastArgv - p - 2; 3139 buf[i] = '\0'; 3140 } 3141 bp = buf; 3142 while (ch = *bp++) 3143 if (ch != '\n' && ch != '\r') 3144 *p++ = ch; 3145 while (p < LastArgv) 3146 *p++ = ' '; 3147 } 3148 #endif /* OLD_SETPROCTITLE */ 3149 3150 static void 3151 logxfer(name, size, start) 3152 char *name; 3153 off_t size; 3154 time_t start; 3155 { 3156 char buf[1024]; 3157 char path[MAXPATHLEN + 1]; 3158 time_t now; 3159 3160 if (statfd >= 0 && getwd(path) != NULL) { 3161 time(&now); 3162 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", 3163 ctime(&now)+4, ident, remotehost, 3164 path, name, (long long)size, 3165 (long)(now - start + (now == start))); 3166 write(statfd, buf, strlen(buf)); 3167 } 3168 } 3169 3170 static char * 3171 doublequote(s) 3172 char *s; 3173 { 3174 int n; 3175 char *p, *s2; 3176 3177 for (p = s, n = 0; *p; p++) 3178 if (*p == '"') 3179 n++; 3180 3181 if ((s2 = malloc(p - s + n + 1)) == NULL) 3182 return (NULL); 3183 3184 for (p = s2; *s; s++, p++) { 3185 if ((*p = *s) == '"') 3186 *(++p) = '"'; 3187 } 3188 *p = '\0'; 3189 3190 return (s2); 3191 } 3192